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  • Physics  (314)
  • Cloning, Molecular  (293)
  • Chemistry  (277)
  • Cell & Developmental Biology
  • Inorganic Chemistry
  • Polymer and Materials Science
  • American Association for the Advancement of Science (AAAS)  (887)
  • 2015-2019  (545)
  • 1990-1994  (248)
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  • 1
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    [In Depth] Long-delayed nuclear center looks set for construction (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-08
    Description: After many years of delays, the €1.7 billion Facility for Antiproton and Ion Research, an extension of the GSI Helmholtz Center for Heavy Ion Research near Darmstadt, Germany, may finally get built. At a council meeting on 27 and 28 June, the partner countries—eight European Union members plus India and Russia—concluded that they have enough money to cover a €320 million budget gap; they will now seek building permits from the German government. Still, some countries have yet to commit their share of the missing cash, including Russia, which had agreed to bear about 18% of FAIR's total construction cost, the second largest contribution after Germany's 70%. Author: Edwin Cartlidge
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    [Perspective] Molecular sieves for gas separation (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-08
    Description: Separation and purification are critical industrial processes for separating components of chemical mixtures, and these processes account for about half of industrial energy usage (1). Gas mixtures of compounds with very similar physical properties are particularly difficult to separate. On pages 137 and 141 of this issue, Cadiau et al. (2) and Cui et al. (3), respectively, show that microporous materials can be designed to have high adsorption capacity and selectivity for particular hydrocarbons, enabling energy-efficient separation. Author: Jerry Y. S. Lin
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    [Perspective] How to break down crystalline cellulose (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-05-27
    Description: Biomass-degrading microorganisms use lytic polysaccharide monooxygenase (LPMO) enzymes to help digest cellulose, chitin, and starch. By cleaving otherwise inaccessible crystalline cellulose chains, these enzymes provide access to hydrolytic enzymes. LPMOs are of interest to biotechnology because efficient depolymerization of cellulose is a major bottleneck for the production of biologically based chemicals and fuels. On page 1098 of this issue, Kracher et al. (1) compare LPMO-reducing substrates in fungi from different taxonomic groups and lifestyles, based on both biochemical and genomic evidence. The results provide insights into reductive activation of LPMO that are important for developing more efficient industrial enzymes for lignocellulose biorefineries. Author: Angel T. Martínez
    Keywords: Chemistry
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  • 4
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    [Editors' Choice] Watching phonons propagate (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-05-27
    Description: Author: Jelena Stajic
    Keywords: Physics
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  • 5
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    [Editors' Choice] Shaping the interaction potential (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-15
    Description: Author: Jelena Stajic
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    [This Week in Science] Imaging electromagnetic waveforms (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-22
    Description: Author: Ian S. Osborne
    Keywords: Physics
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  • 7
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    [Editors' Choice] Making sense of transport in WSe2 (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-04-08
    Description: Author: Jelena Stajic
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    [Editors' Choice] Engineering open structures using DNA (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-03-25
    Description: Author: Marc S. Lavine
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    [Perspective] A benchmark for materials simulation (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-03-25
    Description: Density functional theory (DFT) stands out from all first-principles quantum mechanical methods for the simulation of materials, as it enables very good approximations for the complicated components of electronic motion called exchange and correlation. DFT is the method of choice for many materials simulations because of the availability of general-purpose programs that can perform calculations on any material. Results obtained with one DFT program need to be reproducible by any of the other DFT programs, and this has not been straightforward up to now. On page 10.1126/science.aad3000 of this issue, Lejaeghere et al. (1) describe an extensive effort by developers of the major solid-state DFT codes to provide a unified and reproducible benchmark of precision for their calculations based on a reliable criterion, the so-called Δ gauge. Using the Δ gauge, the authors found that the level of precision that can be achieved today in DFT calculations of elemental crystalline solids is comparable to the precision of the most advanced techniques for experimental measurement of the properties of materials. The work leads to the conclusion that the DFT simulation of elemental crystalline solids is a (computationally) solved problem, but also poses the question of whether we can achieve the same levels of validation and reproducibility for more complex simulations of materials involving several elements and/or several methods. Author: Chris-Kriton Skylaris
    Keywords: Physics
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  • 10
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    [Perspective] Timing photoemission—Final state matters (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-07-01
    Description: The photoemission of electrons from atoms, molecules, and condensed matter provides the experimental basis of our understanding of electronic structure. During the process of photoemission, a sufficiently large quantum of electromagnetic radiation (a photon) is absorbed by matter and converted into an electronic excitation, promoting a bound electron into a final state above the vacuum energy Evac. In photoemission spectroscopy, the kinetic energy and momentum of electrons in such final states are analyzed after their propagation to a distant detector. To determine the electronic structure of the sample, the “sudden approximation” has to be fulfilled, whereby the photoelectron leaves the sample fast enough, without further interaction with the remaining electronic structure. On page 62 of this issue, Tao et al. (1) provide unprecedented insight into final-state dynamics by measuring the time a photoelectron takes to leave a solid material for characteristically different final states. By comparing an electron excited to a final state of a nickel solid Ψ Nif with one excited to a state of vacuum Ψ vacf, they establish that a photoelectron resides in the final state for 200 attoseconds (as) (2 × 10−16 s) before it leaves the nickel (see the figure). Such time scales would still allow for the electron to interact with its surroundings and, thus, are relevant for the validity of the sudden approximation. Authors: Uwe Bovensiepen, Manuel Ligges
    Keywords: Physics
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  • 11
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    [Editors' Choice] A partially protected surface state (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-06-24
    Description: Author: Jelena Stajic
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 12
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    [Book Review] The supercollider that wasn't (2016)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2016-08-16
    Description: When a multibillion-dollar physics experiment is canceled, it's tempting to look for lessons that can be applied to future megascience projects. A new book on the rise and fall of the Superconducting Supercollider (SSC) by a trio of science historians takes on that challenge. And while the authors do an excellent job of describing what occurred in the decade from its inception to its demise, they stumble when trying to assign blame. Author: Jeffrey Mervis
    Keywords: Physics
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  • 13
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    Left- or right-handed C-H bond activation (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-02-16
    Keywords: Chemistry
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  • 14
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    Comment on "Selective anaerobic oxidation of methane enables direct synthesis of methanol" (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-02-16
    Description: The comment and response concerning the report of oxidation of methane to methanol by water (Reports, 5 May 2017, p. 523) do not fully capture the implications of thermodynamic limitations. A nonisothermal process in which each cycle requires a large temperature swing and permits only substoichiometric methane conversion surely could not be carried out on any practical scale.
    Keywords: Chemistry
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  • 15
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    Response to Comment on "Selective anaerobic oxidation of methane enables direct synthesis of methanol" (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-02-16
    Description: Labinger argues that stepwise reaction of methane with water to produce methanol and hydrogen will never be commercially feasible because of its substoichiometric basis with respect to the active site and the requirement of a large temperature swing. This comment is not touching any new ground, beyond describing the thermodynamic feasibility, thermal cycling, and the role of water as discussed previously. Most important, it does not have a solid numerical basis.
    Keywords: Chemistry
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  • 16
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    Silicon smooths the way to vinyl cations (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-07-27
    Keywords: Chemistry
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    Electronic ISSN: 1095-9203
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  • 17
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    Teaching an old carbocation new tricks: Intermolecular C-H insertion reactions of vinyl cations (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-07-27
    Description: Vinyl carbocations have been the subject of extensive experimental and theoretical studies over the past five decades. Despite this long history in chemistry, the utility of vinyl cations in chemical synthesis has been limited, with most reactivity studies focusing on solvolysis reactions or intramolecular processes. Here we report synthetic and mechanistic studies of vinyl cations generated through silylium–weakly coordinating anion catalysis. We find that these reactive intermediates undergo mild intermolecular carbon-carbon bond–forming reactions, including carbon-hydrogen (C–H) insertion into unactivated sp 3 C–H bonds and reductive Friedel-Crafts reactions with arenes. Moreover, we conducted computational studies of these alkane C–H functionalization reactions and discovered that they proceed through nonclassical, ambimodal transition structures. This reaction manifold provides a framework for the catalytic functionalization of hydrocarbons using simple ketone derivatives.
    Keywords: Chemistry
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  • 18
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    Poetic and polemic (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-03
    Keywords: Physics
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  • 19
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    Cranking up the field (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-03
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 20
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    Scale-invariant magnetoresistance in a cuprate superconductor (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-03
    Description: The anomalous metallic state in the high-temperature superconducting cuprates is masked by superconductivity near a quantum critical point. Applying high magnetic fields to suppress superconductivity has enabled detailed studies of the normal state, yet the direct effect of strong magnetic fields on the metallic state is poorly understood. We report the high-field magnetoresistance of thin-film La 2– x Sr x CuO 4 cuprate in the vicinity of the critical doping, 0.161 ≤ p ≤ 0.190. We find that the metallic state exposed by suppressing superconductivity is characterized by magnetoresistance that is linear in magnetic fields up to 80 tesla. The magnitude of the linear-in-field resistivity mirrors the magnitude and doping evolution of the well-known linear-in-temperature resistivity that has been associated with quantum criticality in high-temperature superconductors.
    Keywords: Physics
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  • 21
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    Time and place of electron exit (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-22
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 22
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    Tunable quantum criticality and super-ballistic transport in a "charge" Kondo circuit (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-22
    Description: Quantum phase transitions (QPTs) are ubiquitous in strongly correlated materials. However, the microscopic complexity of these systems impedes the quantitative understanding of QPTs. We observed and thoroughly analyzed the rich strongly correlated physics in two profoundly dissimilar regimes of quantum criticality. With a circuit implementing a quantum simulator for the three-channel Kondo model, we reveal the universal scalings toward different low-temperature fixed points and along the multiple crossovers from quantum criticality. An unanticipated violation of the maximum conductance for ballistic free electrons is uncovered. The present charge pseudospin implementation of a Kondo impurity opens access to a broad variety of strongly correlated phenomena.
    Keywords: Physics
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  • 23
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    Orientation-dependent stereo Wigner time delay and electron localization in a small molecule (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-22
    Description: Attosecond metrology of atoms has accessed the time scale of the most fundamental processes in quantum mechanics. Transferring the time-resolved photoelectric effect from atoms to molecules considerably increases experimental and theoretical challenges. Here we show that orientation- and energy-resolved measurements characterize the molecular stereo Wigner time delay. This observable provides direct information on the localization of the excited electron wave packet within the molecular potential. Furthermore, we demonstrate that photoelectrons resulting from the dissociative ionization process of the CO molecule are preferentially emitted from the carbon end for dissociative 2 states and from the center and oxygen end for the 2 states of the molecular ion. Supported by comprehensive theoretical calculations, this work constitutes a complete spatially and temporally resolved reconstruction of the molecular photoelectric effect.
    Keywords: Physics
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  • 24
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    Separation of enantiomers by their enantiospecific interaction with achiral magnetic substrates (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-22
    Description: It is commonly assumed that recognition and discrimination of chirality, both in nature and in artificial systems, depend solely on spatial effects. However, recent studies have suggested that charge redistribution in chiral molecules manifests an enantiospecific preference in electron spin orientation. We therefore reasoned that the induced spin polarization may affect enantiorecognition through exchange interactions. Here we show experimentally that the interaction of chiral molecules with a perpendicularly magnetized substrate is enantiospecific. Thus, one enantiomer adsorbs preferentially when the magnetic dipole is pointing up, whereas the other adsorbs faster for the opposite alignment of the magnetization. The interaction is not controlled by the magnetic field per se, but rather by the electron spin orientations, and opens prospects for a distinct approach to enantiomeric separations.
    Keywords: Chemistry
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  • 25
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    Inspiration from a vitamin (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-29
    Keywords: Chemistry
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  • 26
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    Going beyond the first Chern number (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-06-29
    Keywords: Physics
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  • 27
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    Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-06-29
    Description: The ultrafast laser excitation of matters leads to nonequilibrium states with complex solid-liquid phase-transition dynamics. We used electron diffraction at mega–electron volt energies to visualize the ultrafast melting of gold on the atomic scale length. For energy densities approaching the irreversible melting regime, we first observed heterogeneous melting on time scales of 100 to 1000 picoseconds, transitioning to homogeneous melting that occurs catastrophically within 10 to 20 picoseconds at higher energy densities. We showed evidence for the heterogeneous coexistence of solid and liquid. We determined the ion and electron temperature evolution and found superheated conditions. Our results constrain the electron-ion coupling rate, determine the Debye temperature, and reveal the melting sensitivity to nucleation seeds.
    Keywords: Physics
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  • 28
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    Observation of the topological Anderson insulator in disordered atomic wires (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-11-23
    Description: Topology and disorder have a rich combined influence on quantum transport. To probe their interplay, we synthesized one-dimensional chiral symmetric wires with controllable disorder via spectroscopic Hamiltonian engineering, based on the laser-driven coupling of discrete momentum states of ultracold atoms. Measuring the bulk evolution of a topological indicator after a sudden quench, we observed the topological Anderson insulator phase, in which added disorder drives the band structure of a wire from topologically trivial to nontrivial. In addition, we observed the robustness of topologically nontrivial wires to weak disorder and measured the transition to a trivial phase in the presence of strong disorder. Atomic interactions in this quantum simulation platform may enable realizations of strongly interacting topological fluids.
    Keywords: Physics
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  • 29
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    Playing with particle physics (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-11-30
    Keywords: Physics
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  • 30
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    Making a practical valleytronics device (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-12-07
    Keywords: Physics
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  • 31
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    A valley valve and electron beam splitter (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-12-07
    Description: Developing alternative paradigms of electronics beyond silicon technology requires the exploration of fundamentally new physical mechanisms, such as the valley-specific phenomena in hexagonal two-dimensional materials. We realize ballistic valley Hall kink states in bilayer graphene and demonstrate gate-controlled current transmission in a four-kink router device. The operations of a waveguide, a valve, and a tunable electron beam splitter are demonstrated. The valley valve exploits the valley-momentum locking of the kink states and reaches an on/off ratio of 8 at zero magnetic field. A magnetic field enables a full-range tunable coherent beam splitter. These results pave a path to building a scalable, coherent quantum transportation network based on the kink states.
    Keywords: Physics
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    Observation of the geometric phase effect in the H + HD -〉 H2 + D reaction (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-12-14
    Description: Theory has established the importance of geometric phase (GP) effects in the adiabatic dynamics of molecular systems with a conical intersection connecting the ground- and excited-state potential energy surfaces, but direct observation of their manifestation in chemical reactions remains a major challenge. Here, we report a high-resolution crossed molecular beams study of the H + HD -〉 H 2 + D reaction at a collision energy slightly above the conical intersection. Velocity map ion imaging revealed fast angular oscillations in product quantum state–resolved differential cross sections in the forward scattering direction for H 2 products at specific rovibrational levels. The experimental results agree with adiabatic quantum dynamical calculations only when the GP effect is included.
    Keywords: Chemistry
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    Photocatalytic upgrading of natural gas (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-08-17
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    More to imaging than meets the eye (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-17
    Keywords: Physics
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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    Radically transforming light hydrocarbons (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-17
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 36
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    Stereodivergent synthesis of 1,4-dicarbonyls by traceless charge-accelerated sulfonium rearrangement (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-17
    Description: The chemistry of the carbonyl group is essential to modern organic synthesis. The preparation of substituted, enantioenriched 1,3- or 1,5-dicarbonyls is well developed, as their disconnection naturally follows from the intrinsic polarity of the carbonyl group. By contrast, a general enantioselective access to quaternary stereocenters in acyclic 1,4-dicarbonyl systems remains an unresolved problem, despite the tremendous importance of 2,3-substituted 1,4-dicarbonyl motifs in natural products and drug scaffolds. Here we present a broad enantioselective and stereodivergent strategy to access acyclic, polysubstituted 1,4-dicarbonyls via acid-catalyzed [3,3]-sulfonium rearrangement starting from vinyl sulfoxides and ynamides. The stereochemistry at sulfur governs the absolute sense of chiral induction, whereas the double bond geometry dictates the relative configuration of the final products.
    Keywords: Chemistry
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  • 37
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    Four varieties of carbonyl sandwich (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-17
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 38
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    Selective functionalization of methane, ethane, and higher alkanes by cerium photocatalysis (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-17
    Description: With the recent soaring production of natural gas, the use of methane and other light hydrocarbon feedstocks as starting materials in synthetic transformations is becoming increasingly economically attractive, although it remains chemically challenging. We report the development of photocatalytic C–H amination, alkylation, and arylation of methane, ethane, and higher alkanes under visible light irradiation at ambient temperature. High catalytic efficiency (turnover numbers up to 2900 for methane and 9700 for ethane) and selectivity were achieved using abundant, inexpensive cerium salts as photocatalysts. Ligand-to-metal charge transfer excitation generated alkoxy radicals from simple alcohols that in turn acted as hydrogen atom transfer catalysts. The mixed-phase gas/liquid reaction was adapted to continuous flow, enabling the efficient use of gaseous feedstocks in scalable photocatalytic transformations.
    Keywords: Chemistry
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    Hot lithium-oxygen batteries charge ahead (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-24
    Keywords: Chemistry
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    A preference for acids (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-24
    Keywords: Chemistry
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    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 41
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    Cooperative quantum magnetism (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-24
    Keywords: Physics
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  • 42
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    18 electrons and counting (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-31
    Keywords: Chemistry
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  • 43
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    Directional control of a processive molecular hopper (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-08-31
    Description: Intrigued by the potential of nanoscale machines, scientists have long attempted to control molecular motion. We monitored the individual 0.7-nanometer steps of a single molecular hopper as it moved in an electric field along a track in a nanopore controlled by a chemical ratchet. The hopper demonstrated characteristics desired in a moving molecule: defined start and end points, processivity, no chemical fuel requirement, directional motion, and external control. The hopper was readily functionalized to carry cargos. For example, a DNA molecule could be ratcheted along the track in either direction, a prerequisite for nanopore sequencing.
    Keywords: Chemistry
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  • 44
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    Quantum entanglement of the spin and orbital angular momentum of photons using metamaterials (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-14
    Description: Metamaterials constructed from deep subwavelength building blocks have been used to demonstrate phenomena ranging from negative refractive index and -near-zero to cloaking, emulations of general relativity, and superresolution imaging. More recently, metamaterials have been suggested as a new platform for quantum optics. We present the use of a dielectric metasurface to generate entanglement between the spin and orbital angular momentum of photons. We demonstrate the generation of the four Bell states on a single photon by using the geometric phase that arises from the photonic spin-orbit interaction and subsequently show nonlocal correlations between two photons that interacted with the metasurface. Our results show that metamaterials are suitable for the generation and manipulation of entangled photon states, introducing the area of quantum optics metamaterials.
    Keywords: Physics
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  • 45
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    Quantum metasurface for multiphoton interference and state reconstruction (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-14
    Description: Metasurfaces based on resonant nanophotonic structures have enabled innovative types of flat-optics devices that often outperform the capabilities of bulk components, yet these advances remain largely unexplored for quantum applications. We show that nonclassical multiphoton interferences can be achieved at the subwavelength scale in all-dielectric metasurfaces. We simultaneously image multiple projections of quantum states with a single metasurface, enabling a robust reconstruction of amplitude, phase, coherence, and entanglement of multiphoton polarization-encoded states. One- and two-photon states are reconstructed through nonlocal photon correlation measurements with polarization-insensitive click detectors positioned after the metasurface, and the scalability to higher photon numbers is established theoretically. Our work illustrates the feasibility of ultrathin quantum metadevices for the manipulation and measurement of multiphoton quantum states, with applications in free-space quantum imaging and communications.
    Keywords: Physics
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    Unlocking P(V): Reagents for chiral phosphorothioate synthesis (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-21
    Description: Phosphorothioate nucleotides have emerged as powerful pharmacological substitutes of their native phosphodiester analogs with important translational applications in antisense oligonucleotide (ASO) therapeutics and cyclic dinucleotide (CDN) synthesis. Stereocontrolled installation of this chiral motif has long been hampered by the systemic use of phosphorus(III) [P(III)]–based reagent systems as the sole practical means of oligonucleotide assembly. A fundamentally different approach is described herein: the invention of a P(V)-based reagent platform for programmable, traceless, diastereoselective phosphorus-sulfur incorporation. The power of this reagent system is demonstrated through the robust and stereocontrolled synthesis of various nucleotidic architectures, including ASOs and CDNs, via an efficient, inexpensive, and operationally simple protocol.
    Keywords: Chemistry
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    Measurement of a superconducting qubit with a microwave photon counter (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-21
    Description: Fast, high-fidelity measurement is a key ingredient for quantum error correction. Conventional approaches to the measurement of superconducting qubits, involving linear amplification of a microwave probe tone followed by heterodyne detection at room temperature, do not scale well to large system sizes. We introduce an approach to measurement based on a microwave photon counter demonstrating raw single-shot measurement fidelity of 92%. Moreover, the intrinsic damping of the photon counter is used to extract the energy released by the measurement process, allowing repeated high-fidelity quantum nondemolition measurements. Our scheme provides access to the classical outcome of projective quantum measurement at the millikelvin stage and could form the basis for a scalable quantum-to-classical interface.
    Keywords: Physics
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    Self-assembly of lattices with high structural complexity from a geometrically simple molecule (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-21
    Description: Here we report an anomalous porous molecular crystal built of C–H···N-bonded double-layered roof-floor components and wall components of a segregatively interdigitated architecture. This complicated porous structure consists of only one type of fully aromatic multijoint molecule carrying three identical dipyridylphenyl wedges. Despite its high symmetry, this molecule accomplishes difficult tasks by using two of its three wedges for roof-floor formation and using its other wedge for wall formation. Although a C–H···N bond is extremely labile, the porous crystal maintains its porosity until thermal breakdown of the C–H···N bonds at 202°C occurs, affording a nonporous polymorph. Though this nonporous crystal survives even at 325°C, it can retrieve the parent porosity under acetonitrile vapor. These findings show how one can translate simplicity into ultrahigh complexity.
    Keywords: Chemistry
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    Making ultrafast cycles of light (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-28
    Keywords: Physics
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    Two ways out of an oxetane (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-28
    Keywords: Chemistry
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    Arenes and amides from a single source (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-28
    Keywords: Chemistry
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    Interrupted carbonyl-olefin metathesis via oxygen atom transfer (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-28
    Description: Some of the simplest and most powerful carbon-carbon bond forming strategies take advantage of readily accessible ubiquitous motifs: carbonyls and olefins. Here we report a fundamentally distinct mode of reactivity between carbonyls and olefins that differs from established acid-catalyzed carbonyl-ene, Prins, and carbonyl-olefin metathesis reaction paths. A range of epsilon, zeta-unsaturated ketones undergo Brønsted acid–catalyzed intramolecular cyclization to provide tetrahydrofluorene products via the formation of two new carbon-carbon bonds. Theoretical calculations and accompanying mechanistic studies suggest that this carbocyclization reaction proceeds through the intermediacy of a transient oxetane formed by oxygen atom transfer. The complex polycyclic frameworks in this product class appear as common substructures in organic materials, bioactive natural products, and recently developed pharmaceuticals.
    Keywords: Chemistry
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    Arylsulfonylacetamides as bifunctional reagents for alkene aminoarylation (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-09-28
    Description: Alkene aminoarylation with a single, bifunctional reagent is a concise synthetic strategy. We report a catalytic protocol for the addition of arylsulfonylacetamides across electron-rich alkenes with complete anti-Markovnikov regioselectivity and excellent diastereoselectivity to provide 2,2-diarylethylamines. In this process, single-electron alkene oxidation enables carbon-nitrogen bond formation to provide a key benzylic radical poised for a Smiles-Truce 1,5-aryl shift. This reaction is redox-neutral, exhibits broad functional group compatibility, and occurs at room temperature with loss of sulfur dioxide. As this process is driven by visible light, uses readily available starting materials, and demonstrates convergent synthesis, it is well suited for use in a variety of synthetic endeavors.
    Keywords: Chemistry
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    Quantum oscillations in an insulator (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Keywords: Physics
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    Activating plasmonic chemistry (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Keywords: Chemistry
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    Hot carriers reducing thermal barriers (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Keywords: Chemistry
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    Insulator or a metal? (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Keywords: Physics
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    Quantum oscillations of electrical resistivity in an insulator (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Description: In metals, orbital motions of conduction electrons on the Fermi surface are quantized in magnetic fields, which is manifested by quantum oscillations in electrical resistivity. This Landau quantization is generally absent in insulators. Here, we report a notable exception in an insulator—ytterbium dodecaboride (YbB 12 ). The resistivity of YbB 12 , which is of a much larger magnitude than the resistivity in metals, exhibits distinct quantum oscillations. These unconventional oscillations arise from the insulating bulk, even though the temperature dependence of the oscillation amplitude follows the conventional Fermi liquid theory of metals with a large effective mass. Quantum oscillations in the magnetic torque are also observed, albeit with a lighter effective mass.
    Keywords: Physics
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  • 59
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    Quantifying hot carrier and thermal contributions in plasmonic photocatalysis (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-05
    Description: Photocatalysis based on optically active, "plasmonic" metal nanoparticles has emerged as a promising approach to facilitate light-driven chemical conversions under far milder conditions than thermal catalysis. However, an understanding of the relation between thermal and electronic excitations has been lacking. We report the substantial light-induced reduction of the thermal activation barrier for ammonia decomposition on a plasmonic photocatalyst. We introduce the concept of a light-dependent activation barrier to account for the effect of light illumination on electronic and thermal excitations in a single unified picture. This framework provides insight into the specific role of hot carriers in plasmon-mediated photochemistry, which is critically important for designing energy-efficient plasmonic photocatalysts.
    Keywords: Chemistry
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    An acid inaccessible to aldol products (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-12
    Keywords: Chemistry
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    Iodine smooths the way to ketyl radicals (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-12
    Keywords: Chemistry
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    Magnons propagating in graphene (2018)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2018-10-12
    Keywords: Physics
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    Electrical generation and detection of spin waves in a quantum Hall ferromagnet (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-10-12
    Description: Spin waves are collective excitations of magnetic systems. An attractive setting for studying long-lived spin-wave physics is the quantum Hall (QH) ferromagnet, which forms spontaneously in clean two-dimensional electron systems at low temperature and in a perpendicular magnetic field. We used out-of-equilibrium occupation of QH edge channels in graphene to excite and detect spin waves in magnetically ordered QH states. Our experiments provide direct evidence for long-distance spin-wave propagation through different ferromagnetic phases in the N = 0 Landau level, as well as across the insulating canted antiferromagnetic phase. Our results will enable experimental investigation of the fundamental magnetic properties of these exotic two-dimensional electron systems.
    Keywords: Physics
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    Ketyl radical reactivity via atom transfer catalysis (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-10-12
    Description: Single-electron reduction of a carbonyl to a ketyl enables access to a polarity-reversed platform of reactivity for this cornerstone functional group. However, the synthetic utility of the ketyl radical is hindered by the strong reductants necessary for its generation, which also limit its reactivity to net reductive mechanisms. We report a strategy for net redox-neutral generation and reaction of ketyl radicals. The in situ conversion of aldehydes to α-acetoxy iodides lowers their reduction potential by more than 1 volt, allowing for milder access to the corresponding ketyl radicals and an oxidative termination event. Upon subjecting these iodides to a dimanganese decacarbonyl precatalyst and visible light irradiation, an atom transfer radical addition (ATRA) mechanism affords a broad scope of vinyl iodide products with high Z -selectivity.
    Keywords: Chemistry
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    Confined acids catalyze asymmetric single aldolizations of acetaldehyde enolates (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-10-12
    Description: Reactions that form a product with the same reactive functionality as that of one of the starting compounds frequently end in oligomerization. As a salient example, selective aldol coupling of the smallest, though arguably most useful, enolizable aldehyde, acetaldehyde, with just one partner substrate has proven to be extremely challenging. Here, we report a highly enantioselective Mukaiyama aldol reaction with the simple triethylsilyl (TES) and tert -butyldimethylsilyl (TBS) enolates of acetaldehyde and various aliphatic and aromatic acceptor aldehydes. The reaction is catalyzed by recently developed, strongly acidic imidodiphosphorimidates (IDPi), which, like enzymes, display a confined active site but, like small-molecule catalysts, have a broad substrate scope. The process is scalable, fast, efficient (0.5 to 1.5 mole % catalyst loading), and greatly simplifies access to highly valuable silylated acetaldehyde aldols.
    Keywords: Chemistry
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    Breaking through the nitrogen ceiling (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
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    Publication Date: 2018-12-21
    Keywords: Chemistry
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    Magnetic hysteresis up to 80 kelvin in a dysprosium metallocene single-molecule magnet (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-12-21
    Description: Single-molecule magnets (SMMs) containing only one metal center may represent the lower size limit for molecule-based magnetic information storage materials. Their current drawback is that all SMMs require liquid-helium cooling to show magnetic memory effects. We now report a chemical strategy to access the dysprosium metallocene cation [(Cp i Pr5 )Dy(Cp*)] + (Cp i Pr5 , penta-iso-propylcyclopentadienyl; Cp *, pentamethylcyclopentadienyl), which displays magnetic hysteresis above liquid-nitrogen temperatures. An effective energy barrier to reversal of the magnetization of U eff = 1541 wave number is also measured. The magnetic blocking temperature of T B = 80 kelvin for this cation overcomes an essential barrier toward the development of nanomagnet devices that function at practical temperatures.
    Keywords: Chemistry
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    Induction of AIDS in rhesus monkeys by molecularly cloned simian immunodeficiency virus (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-01
    Description: Better understanding of the pathogenesis of acquired immunodeficiency syndrome (AIDS) would be greatly facilitated by a relevant animal model that uses molecularly cloned virus of defined sequence to induce the disease. Such a system would also be of great value for AIDS vaccine research. An infectious molecular clone of simian immunodeficiency virus (SIV) was identified that induces AIDS in common rhesus monkeys in a time frame suitable for laboratory investigation. These results provide another strong link in the chain of evidence for the viral etiology of AIDS. More importantly, they define a system for molecular dissection of the determinants of AIDS pathogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kestler, H -- Kodama, T -- Ringler, D -- Marthas, M -- Pedersen, N -- Lackner, A -- Regier, D -- Sehgal, P -- Daniel, M -- King, N -- AI25328/AI/NIAID NIH HHS/ -- RR00168/RR/NCRR NIH HHS/ -- RR00169/RR/NCRR NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1109-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉New England Regional Primate Research Center, Harvard Medical School, Southborough, MA 01772.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2160735" target="_blank"〉PubMed〈/a〉
    Keywords: *Acquired Immunodeficiency Syndrome ; Animals ; Antibodies, Viral/biosynthesis ; Cloning, Molecular ; *Disease Models, Animal ; Leukocytes, Mononuclear/microbiology ; Macaca mulatta ; Macrophages/microbiology ; Opportunistic Infections/etiology ; *Retroviridae Infections/complications/immunology ; *Simian Immunodeficiency Virus/genetics/immunology/isolation & ; purification/pathogenicity ; Transfection ; Virus Replication
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    The meaning of hydrophobicity (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dill, K A -- New York, N.Y. -- Science. 1990 Oct 12;250(4978):297-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmaceutical Chemistry, School of Pharmacy, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2218535" target="_blank"〉PubMed〈/a〉
    Keywords: Energy Transfer ; Physical Phenomena ; Physics ; *Protein Conformation ; Proteins/*chemistry ; Solutions
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    GT-1 binding site confers light responsive expression in transgenic tobacco (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-04-27
    Description: Light-dependent expression of rbcS, the gene encoding the small subunit of ribulose-1,5-bisphosphate carboxylase, which is the key enzyme involved in carbon fixation in higher plants, is regulated at the transcriptional level. Sequence analysis of the gene has uncovered a conserved GT motif in the -150 to -100 region of many rbcS promoters. This motif serves as the binding site of a nuclear factor, designated GT-1. Analysis of site-specific mutants of pea rbcS-3A promoter demonstrated that GT-1 binding in vitro is correlated with light-responsive expression of the rbcS promoter in transgenic plants. However, it is not known whether factors other than GT-1 might also be required for activation of transcription by light. A synthetic tetramer of box II (TGTGTGGTTAATATG), the GT-1 binding site located between -152 to -138 of the rbcS-3A promoter, inserted upstream of a truncated cauliflower mosaic virus 35S promoter is sufficient to confer expression in leaves of transgenic tobacco. This expression occurs principally in chloroplast-containing cells, is induced by light, and is correlated with the ability of box II to bind GT-1 in vitro. The data show that the binding site for GT-1 is likely to be a part of the molecular light switch for rbcS activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lam, E -- Chua, N H -- New York, N.Y. -- Science. 1990 Apr 27;248(4954):471-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Plant Molecular Biology, Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2330508" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Binding Sites ; Chloramphenicol O-Acetyltransferase/genetics ; Cloning, Molecular ; DNA-Binding Proteins/*metabolism ; Gene Expression Regulation/*physiology ; Genetic Vectors ; *Light ; Molecular Sequence Data ; Mutation ; Nuclear Proteins/*metabolism ; Plant Proteins/*metabolism ; *Plants, Toxic ; Promoter Regions, Genetic/genetics ; Ribulose-Bisphosphate Carboxylase/*genetics ; Tobacco/enzymology/*genetics ; Transcription, Genetic/radiation effects ; Transformation, Genetic
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    A cDNA for a protein that interacts with the human immunodeficiency virus Tat transactivator (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-29
    Description: The human immunodeficiency virus (HIV) tat protein (Tat) is a positive regulator of virus gene expression and replication. Biotinylated Tat was used as a probe to screen a lambda gt11 fusion protein library, and a complementary DNA encoding a protein that interacts with Tat was cloned. Expression of this protein, designated TBP-1 (for Tat binding protein-1), was observed in a variety of cell lines, with expression being highest in human cells. TBP-1 was localized predominantly in the nucleus, which is consistent with the nuclear localization of Tat. In cotransfection experiments, expression of TBP-1 was able to specifically suppress Tat-mediated transactivation. The strategy described may be useful for direct identification and cloning of genes encoding proteins that associate with other proteins to modulate their activity in a positive or negative fashion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelbock, P -- Dillon, P J -- Perkins, A -- Rosen, C A -- New York, N.Y. -- Science. 1990 Jun 29;248(4963):1650-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology and Virology, Roche Institute of Molecular Biology, Hoffmann-La Roche Inc., Nutley, NJ 07110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2194290" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Cloning, Molecular ; DNA, Neoplasm/genetics ; DNA-Binding Proteins/*genetics/metabolism ; Escherichia coli/genetics ; Gene Expression ; Gene Library ; Gene Products, tat/*metabolism ; HIV/genetics ; Humans ; Molecular Sequence Data ; Plasmids ; Polymerase Chain Reaction ; *Proteasome Endopeptidase Complex ; Recombinant Fusion Proteins/metabolism ; Trans-Activators/*metabolism ; Transcriptional Activation ; Transfection ; tat Gene Products, Human Immunodeficiency Virus
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    Common modifications of trimeric G proteins and ras protein: involvement of polyisoprenylation (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-13
    Description: The heterotrimeric guanine nucleotide-binding regulatory proteins act at the inner surface of the plasma membrane to relay information from cell surface receptors to effectors inside the cell. These G proteins are not integral membrane proteins, yet are membrane associated. The processing and function of the gamma subunit of the yeast G protein involved in mating-pheromone signal transduction was found to be affected by the same mutations that block ras processing. The nature of these mutations implied that the gamma subunit was polyisoprenylated and that this modification was necessary for membrane association and biological activity. A microbial screen was developed for pharmacological agents that inhibit polyisoprenylation and that have potential application in cancer therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Finegold, A A -- Schafer, W R -- Rine, J -- Whiteway, M -- Tamanoi, F -- CA 41996/CA/NCI NIH HHS/ -- GM 07183/GM/NIGMS NIH HHS/ -- GM 35827/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 13;249(4965):165-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1695391" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cell Membrane/metabolism ; Cloning, Molecular ; Epitopes/genetics ; GTP-Binding Proteins/genetics/*metabolism ; Hemagglutinins, Viral/immunology ; Lovastatin/pharmacology ; Mevalonic Acid/pharmacology ; Molecular Sequence Data ; Mutation ; Oncogene Protein p21(ras)/genetics/*metabolism ; Orthomyxoviridae/immunology ; Protein Processing, Post-Translational ; Saccharomyces cerevisiae/*genetics/metabolism ; Signal Transduction ; Suppression, Genetic
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    A potent GAL4 derivative activates transcription at a distance in vitro (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: Transcription of a typical eukaryotic gene by RNA polymerase II is activated by proteins bound to sites found near the beginning of the gene as well as to sites, called enhancers, located a great distance from the gene. According to one view, the primary difference between an activator that can work at a large distance and one that cannot is that the former bears a particularly strong activating region; the stronger the activating region, the more readily the activator interacts with its target bound near the transcriptional start site, with the intervening DNA looping out to accommodate the reaction. One alternative view is that the effect of proteins bound to enhancers might require some special aspect of cellular or chromosome structure. Consistent with the first view, an activator bearing an unusually potent activating region can stimulate transcription of a mammalian gene in a HeLa nuclear extract when bound as far as 1.3 kilobase pairs upstream or 320 base pairs downstream of the transcriptional start site.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carey, M -- Leatherwood, J -- Ptashne, M -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):710-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, MA 02138.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2405489" target="_blank"〉PubMed〈/a〉
    Keywords: Activating Transcription Factors ; Binding Sites ; Blood Proteins/pharmacology ; Cloning, Molecular ; DNA/metabolism ; DNA-Binding Proteins ; Fungal Proteins/metabolism/*pharmacology ; HeLa Cells ; Phosphoproteins/pharmacology ; Promoter Regions, Genetic ; RNA Polymerase II/metabolism ; Recombinant Fusion Proteins/pharmacology ; *Saccharomyces cerevisiae Proteins ; Templates, Genetic ; Trans-Activators/pharmacology ; Transcription Factors/pharmacology ; Transcription, Genetic/*drug effects
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    Autophosphorylation of protein kinase C at three separated regions of its primary sequence (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-27
    Description: The major autophosphorylation sites of the rat beta II isozyme of protein kinase C were identified. The modified threonine and serine residues were found in the amino-terminal peptide, the carboxyl-terminal tail, and the hinge region between the regulatory lipid-binding domain and the catalytic kinase domain. Because this autophosphorylation follows an intrapeptide mechanism, extraordinary flexibility of the protein is necessary to phosphorylate the three regions. Comparison of the sequences surrounding the modified residues showed no obvious recognition motif nor any similarity to substrate phosphorylation sites, suggesting that proximity to the active site may be the primary criterion for their phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flint, A J -- Paladini, R D -- Koshland, D E Jr -- DK09765/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Jul 27;249(4967):408-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2377895" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites ; Brain/enzymology ; Cloning, Molecular ; Isoenzymes/genetics/*metabolism ; Molecular Sequence Data ; Peptide Fragments/isolation & purification/metabolism ; Phosphorylation ; Protein Conformation ; Protein Kinase C/genetics/*metabolism ; Rats ; Recombinant Proteins/metabolism ; Signal Transduction ; Trypsin
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    Cloning of a 67-kD neutrophil oxidase factor with similarity to a noncatalytic region of p60c-src (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-05-11
    Description: Chronic granulomatous diseases (CGDs) are characterized by recurrent infections resulting from impaired superoxide production by a phagocytic cell, nicotinamide adenine dinucleotide phosphate (reduced) (NADPH) oxidase. Complementary DNAs were cloned that encode the 67-kilodalton (kD) cytosolic oxidase factor (p67), which is deficient in 5% of CGD patients. Recombinant p67 (r-p67) partially restored NADPH oxidase activity to p67-deficient neutrophil cytosol from these patients. The p67 cDNA encodes a 526-amino acid protein with acidic middle and carboxyl-terminal domains that are similar to a sequence motif found in the noncatalytic domain of src-related tyrosine kinases. This motif was recently noted in phospholipase C-gamma, nonerythroid alpha-spectrin (fodrin), p21ras-guanosine triphophatase-activating protein (GAP), myosin-1 isoforms, yeast proteins cdc-25 and fus-1, and the 47-kD phagocyte oxidase factor (p47), which suggests the possibility of common regulatory features.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leto, T L -- Lomax, K J -- Volpp, B D -- Nunoi, H -- Sechler, J M -- Nauseef, W M -- Clark, R A -- Gallin, J I -- Malech, H L -- I01 BX000513/BX/BLRD VA/ -- New York, N.Y. -- Science. 1990 May 11;248(4956):727-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Clinical Investigation, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1692159" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cloning, Molecular ; Granulomatous Disease, Chronic/blood/enzymology/genetics ; Humans ; Molecular Sequence Data ; NADH, NADPH Oxidoreductases/blood/*genetics ; NADPH Oxidase ; Neutrophils/*enzymology ; Protein-Tyrosine Kinases/genetics ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins pp60(c-src) ; Sequence Homology, Nucleic Acid
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    Dominant negative regulation of the mouse alpha-fetoprotein gene in adult liver (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-12-21
    Description: Transcription of the mouse alpha-fetoprotein gene is activated in the developing fetal liver and gut and repressed in both tissues shortly after birth. With germline transformation in mice, a cis-acting element was identified upstream of the transcription initiation site of the alpha-fetoprotein gene that was responsible for repression of the gene in adult liver. This negative element acts as a repressor in a position-dependent manner.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vacher, J -- Tilghman, S M -- CA44976/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 21;250(4988):1732-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Biology, Princeton University, NJ 08544.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1702902" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Animals, Newborn ; Chromosome Deletion ; Cloning, Molecular ; DNA-Binding Proteins/metabolism ; Enhancer Elements, Genetic ; Fetus ; *Gene Expression Regulation ; Hepatocyte Nuclear Factor 1 ; Hepatocyte Nuclear Factor 1-alpha ; Hepatocyte Nuclear Factor 1-beta ; Liver/growth & development/*metabolism ; Mice ; *Nuclear Proteins ; Transcription Factors/metabolism ; Transcription, Genetic ; alpha-Fetoproteins/*genetics
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    High-resolution mapping of human chromosome 11 by in situ hybridization with cosmid clones (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-05
    Description: Cosmid clones containing human DNA inserts have been mapped on chromosome 11 by fluorescence in situ hybridization under conditions that suppress signal from repetitive DNA sequences. Thirteen known genes, one chromosome 11-specific DNA repeat, and 36 random clones were analyzed. High-resolution mapping was facilitated by using digital imaging microscopy and by analyzing extended (prometaphase) chromosomes. The map coordinates established by in situ hybridization showed a one to one correspondence with those determined by Southern (DNA) blot analysis of hybrid cell lines containing fragments of chromosome 11. Furthermore, by hybridizing three or more cosmids simultaneously, gene order on the chromosome could be established unequivocally. These results demonstrate the feasibility of rapidly producing high-resolution maps of human chromosomes by in situ hybridization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lichter, P -- Tang, C J -- Call, K -- Hermanson, G -- Evans, G A -- Housman, D -- Ward, D C -- GM-27882/GM/NIGMS NIH HHS/ -- GM-33868/GM/NIGMS NIH HHS/ -- HD-18012/HD/NICHD NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Jan 5;247(4938):64-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Human Genetics, Yale University School of Medicine, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2294592" target="_blank"〉PubMed〈/a〉
    Keywords: Blotting, Southern ; Cell Line ; *Chromosome Mapping ; *Chromosomes, Human, Pair 11 ; Cloning, Molecular ; Cosmids/*genetics ; DNA/*genetics ; DNA Probes ; Fluorescent Dyes ; Humans ; Hybrid Cells ; Microscopy, Fluorescence ; *Nucleic Acid Hybridization ; Repetitive Sequences, Nucleic Acid
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    beta-Arrestin: a protein that regulates beta-adrenergic receptor function (1990)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1990-06-22
    Description: Homologous or agonist-specific desensitization of beta-adrenergic receptors is thought to be mediated by a specific kinase, the beta-adrenergic receptor kinase (beta ARK). However, recent data suggest that a cofactor is required for this kinase to inhibit receptor function. The complementary DNA for such a cofactor was cloned and found to encode a 418-amino acid protein homologous to the retinal protein arrestin. The protein, termed beta-arrestin, was expressed and partially purified. It inhibited the signaling function of beta ARK-phosphorylated beta-adrenergic receptors by more than 75 percent, but not that of rhodopsin. It is proposed that beta-arrestin in concert with beta ARK effects homologous desensitization of beta-adrenergic receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lohse, M J -- Benovic, J L -- Codina, J -- Caron, M G -- Lefkowitz, R J -- DK19318/DK/NIDDK NIH HHS/ -- HL16037/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 22;248(4962):1547-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Medicine, Biochemistry and Cell Biology, Durham, NC 27710.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2163110" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens/*genetics/isolation & purification/pharmacology ; Arrestin ; Blotting, Northern ; Chromatography, Ion Exchange ; Cloning, Molecular ; *Cyclic AMP-Dependent Protein Kinases ; DNA/genetics ; Eye Proteins/*genetics/isolation & purification/pharmacology ; Gene Expression Regulation ; Molecular Sequence Data ; Phosphodiesterase Inhibitors/*pharmacology ; Phosphorylation ; Protein Kinases/*pharmacology ; RNA, Messenger/analysis ; Receptors, Adrenergic, beta/*drug effects/physiology ; Transfection ; beta-Adrenergic Receptor Kinases
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    A base dispute (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Waldrop, M M -- New York, N.Y. -- Science. 1990 Aug 3;249(4968):472-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2382127" target="_blank"〉PubMed〈/a〉
    Keywords: Chemical Phenomena ; Chemistry ; *Information Systems ; Jurisprudence ; Societies, Scientific ; United States
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  • 80
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    Reversal of creatine kinase translational repression by 3' untranslated sequences (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-25
    Description: A subline of U937 cells (U937D) was obtained in which creatine kinase B (CK-B) messenger RNA was present and bound to ribosomes, but CK activity was undetectable. Transformation of U937D cells with retrovirus vectors that contain the 3' untranslated region (3' UTR) of CK-B messenger RNA exhibited CK activity with no change in abundance of CK-B mRNA. The 3' UTR formed a complex in vitro with a component of S100 extracts from wild-type cells. This binding activity was not detectable in S100 extracts from cells that expressed CK activity after transformation with the 3' UTR-containing vector. These results suggest that translation of CK-B is repressed by binding of a soluble factor or factors to the 3' UTR.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ch'ng, J L -- Shoemaker, D L -- Schimmel, P -- Holmes, E W -- GM34366/GM/NIGMS NIH HHS/ -- R01-CA 47631-02/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 May 25;248(4958):1003-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Duke University, Durham, NC 27710.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2343304" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Cloning, Molecular ; Creatine Kinase/*genetics ; *Gene Expression Regulation ; Humans ; Hypoxanthine Phosphoribosyltransferase/genetics ; Polyribosomes/metabolism ; *Protein Biosynthesis ; RNA, Messenger/*genetics
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  • 81
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    Hypertriglyceridemia as a result of human apo CIII gene expression in transgenic mice (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-08-17
    Description: Primary and secondary hypertriglyceridemia is common in the general population, but the biochemical basis for this disease is largely unknown. With the use of transgenic technology, two lines of mice were created that express the human apolipoprotein CIII gene. One of these mouse lines with 100 copies of the gene was found to express large amounts of the protein and to be severely hypertriglyceridemic. The other mouse line with one to two copies of the gene expressed low amounts of the protein, but nevertheless manifested mild hypertriglyceridemia. Thus, overexpression of apolipoprotein CIII can be a primary cause of hypertriglyceridemia in vivo and may provide one possible etiology for this common disorder in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ito, Y -- Azrolan, N -- O'Connell, A -- Walsh, A -- Breslow, J L -- HL 36461/HL/NHLBI NIH HHS/ -- HL33435/HL/NHLBI NIH HHS/ -- HL33714/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Aug 17;249(4970):790-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2167514" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apolipoprotein C-III ; Apolipoproteins C/blood/*genetics ; Chylomicrons/blood ; Cloning, Molecular ; DNA Restriction Enzymes/metabolism ; DNA, Recombinant/metabolism ; *Gene Expression ; Humans ; Hypertriglyceridemia/blood/*genetics ; Lipoproteins, VLDL/blood ; Mice ; Mice, Inbred C57BL ; Mice, Inbred CBA ; Mice, Transgenic ; Nucleic Acid Hybridization ; RNA, Messenger/genetics ; Triglycerides/blood
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  • 82
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    HSP104 required for induced thermotolerance (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-01
    Description: A heat shock protein gene, HSP104, was isolated from Saccharomyces cerevisiae and a deletion mutation was introduced into yeast cells. Mutant cells grew at the same rate as wild-type cells and died at the same rate when exposed directly to high temperatures. However, when given a mild pre-heat treatment, the mutant cells did not acquire tolerance to heat, as did wild-type cells. Transformation with the wild-type gene rescued the defect of mutant cells. The results demonstrate that a particular heat shock protein plays a critical role in cell survival at extreme temperatures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez, Y -- Lindquist, S L -- GM 35483/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 1;248(4959):1112-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, Illinois 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2188365" target="_blank"〉PubMed〈/a〉
    Keywords: Cloning, Molecular ; Fungal Proteins/biosynthesis/*genetics ; Genes, Fungal ; Heat-Shock Proteins/biosynthesis/genetics/*physiology ; *Hot Temperature ; Mutation ; Restriction Mapping ; Saccharomyces cerevisiae/genetics/growth & development/*physiology
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  • 83
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    Identification of a specialized adenylyl cyclase that may mediate odorant detection (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-07
    Description: The mammalian olfactory system may transduce odorant information via a G protein-mediated adenosine 3',5'-monophosphate (cAMP) cascade. A newly discovered adenylyl cyclase, termed type III, has been cloned, and its expression was localized to olfactory neurons. The type III protein resides in the sensory neuronal cilia, which project into the nasal lumen and are accessible to airborne odorants. The enzymatic activity of the type III adenylyl cyclase appears to differ from nonsensory cyclases. The large difference seen between basal and stimulated activity for the type III enzyme could allow considerable modulation of the intracellular cAMP concentration. This property may represent one mechanism of achieving sensitivity in odorant perception.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bakalyar, H A -- Reed, R R -- 5T32CA09339/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 7;250(4986):1403-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2255909" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/genetics/*physiology ; Amino Acid Sequence ; Animals ; Brain/enzymology/physiology ; Cell Line ; Clone Cells ; Cloning, Molecular ; Gene Library ; Glycosylation ; Isoenzymes/genetics/*physiology ; Macromolecular Substances ; Molecular Sequence Data ; Molecular Weight ; Neurons, Afferent/enzymology/physiology ; Nose/enzymology/physiology ; *Odors ; Protein Conformation ; Rats ; *Signal Transduction
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  • 84
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    Peptide processing and targeting in the neuronal secretory pathway (1991)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1991-03-15
    Description: The abdominal ganglion of the marine mollusk Aplysia contains a pair of identified neuronal clusters, the bag cells, which control egg laying by means of a number of unique regulatory mechanisms. Each neuron in the bag cell clusters synthesizes several peptides derived from a single prohormone and packages them into separate vesicles. These vesicles are then differentially localized in specific neuronal processes, thus segregating peptides destined for autocrine and hormonal release sites. Therefore in this system, protein trafficking through the secretory pathway organizes multiple peptide neurochemical messengers to efficiently regulate simple behaviors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jung, L J -- Scheller, R H -- New York, N.Y. -- Science. 1991 Mar 15;251(4999):1330-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Beckman Center, Stanford University, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2003219" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aplysia/genetics/*physiology ; Cell Compartmentation ; Cloning, Molecular ; DNA/genetics ; Invertebrate Hormones/genetics/*metabolism ; Neuropeptides/*physiology ; Neurosecretory Systems/*physiology ; Protein Precursors/metabolism ; Protein Processing, Post-Translational ; Sexual Behavior, Animal/physiology ; Transfection
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  • 85
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    Clathrate hydrate formation in amorphous cometary ice analogs in vacuo (1991)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1991-10-25
    Description: The presence of clathrate hydrates in cometary ice has been suggested to account for anomalous gas release at large radial distances from the sun as well as the retention of volatiles in comets to elevated temperatures. However, how clathrate hydrates can form in low-pressure environments, such as in cold interstellar molecular clouds, in the outer reaches of the early solar nebula, or in cometary ices, has been poorly understood. Experiments performed with the use of a modified electron microscope demonstrate that during the warming of vapor-deposited amorphous ices in vacuo, clathrate hydrates can form by rearrangements in the solid state. Phase separations and microporous textures that are the result of these rearrangements may account for a variety of anomalous cometary phenomena.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Blake, D -- Allamandola, L -- Sandford, S -- Hudgins, D -- Freund, F -- New York, N.Y. -- Science. 1991 Oct 25;254:548-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Planetary Biology Branch, Ames Research Center, Moffett Field, CA 94035, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11538372" target="_blank"〉PubMed〈/a〉
    Keywords: Chemical Phenomena ; Chemistry ; Crystallography ; Earth (Planet) ; Hydrocarbons/chemistry ; Ice/*analysis ; *Meteoroids ; Microscopy, Electron ; *Solar System
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  • 86
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    Identification of the DNA binding site for NGFI-B by genetic selection in yeast (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-31
    Description: An in vivo selection system for isolating targets of DNA binding proteins in yeast was developed and used to identify the DNA binding site for the NGFI-B protein, a member of the steroid-thyroid hormone receptor superfamily. The feasibility of the technique was verified by selecting DNA fragments that contained binding sites for GCN4, a well-characterized yeast transcriptional activator. The DNA binding domain of NGFI-B, expressed as part of a LexA-NGFI-B-GAL4 chimeric activator, was then used to isolate a rat genomic DNA fragment that contained an NGFI-B binding site. The NGFI-B response element (NBRE) is similar to but functionally distinct from elements recognized by the estrogen and thyroid hormone receptors and the hormone receptor-like proteins COUP-TF, CF1, and H-2RIIBP. Cotransfection experiments in mammalian cells demonstrated that NGFI-B can activate transcription from the NBRE with or without its putative ligand binding domain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, T E -- Fahrner, T J -- Johnston, M -- Milbrandt, J -- NS01018/NS/NINDS NIH HHS/ -- P01 CA49712/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 May 31;252(5010):1296-300.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925541" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/metabolism ; Base Sequence ; Binding Sites ; Cloning, Molecular ; DNA, Fungal/*metabolism ; DNA-Binding Proteins/genetics/*metabolism/pharmacology ; Fungal Proteins/metabolism ; Molecular Sequence Data ; Nuclear Receptor Subfamily 4, Group A, Member 1 ; Plasmids ; *Protein Kinases ; Rats ; Receptors, Cytoplasmic and Nuclear ; Receptors, Steroid ; Repressor Proteins ; Saccharomyces cerevisiae/*genetics ; *Saccharomyces cerevisiae Proteins ; *Serine Endopeptidases ; Transcription Factors/genetics/*metabolism/pharmacology ; Transcription, Genetic ; Transfection
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  • 87
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    Cloning and expression of a cocaine-sensitive rat dopamine transporter (1991)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1991-10-25
    Description: The action of dopamine and other monoamine neurotransmitters at synapses is terminated predominantly by high-affinity reuptake into presynaptic terminals by specific sodium-dependent neurotransmitter transport proteins. A complementary DNA encoding a rat dopamine transporter has been isolated that exhibits high sequence similarity with the previously cloned norepinephrine and gamma-aminobutyric acid transporters. Transient expression of the complementary DNA in HeLa cells confirms the cocaine sensitivity of this transporter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kilty, J E -- Lorang, D -- Amara, S G -- New York, N.Y. -- Science. 1991 Oct 25;254(5031):578-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Yale University, New Haven, CT 06510.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1948035" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Carrier Proteins/drug effects/*genetics/metabolism ; Cloning, Molecular ; Cocaine/*pharmacology ; Dopamine/*metabolism ; Dopamine Plasma Membrane Transport Proteins ; Gene Expression ; HeLa Cells ; Humans ; Kinetics ; *Membrane Glycoproteins ; *Membrane Transport Proteins ; Molecular Sequence Data ; *Nerve Tissue Proteins ; Oligodeoxyribonucleotides ; Polymerase Chain Reaction/methods ; Rats ; Sequence Homology, Nucleic Acid ; Transfection
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    Mutation identified as a possible cause of Alzheimer's disease (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-22
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, J -- New York, N.Y. -- Science. 1991 Feb 22;251(4996):876-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1900373" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*genetics ; Amyloid beta-Peptides/*genetics ; Amyloid beta-Protein Precursor ; Chromosomes, Human, Pair 21 ; Cloning, Molecular ; Humans ; *Mutation ; Protein Precursors/*genetics
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  • 89
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    Exchange of conduction pathways between two related K+ channels (1991)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1991-02-22
    Description: The structure of the ion conduction pathway or pore of voltage-gated ion channels is unknown, although the linker between the membrane spanning segments S5 and S6 has been suggested to form part of the pore in potassium channels. To test whether this region controls potassium channel conduction, a 21-amino acid segment of the S5-S6 linker was transplanted from the voltage-activated potassium channel NGK2 to another potassium channel DRK1, which has very different pore properties. In the resulting chimeric channel, the single channel conductance and blockade by external and internal tetraethylammonium (TEA) ion were characteristic of the donor NGK2 channel. Thus, this 21-amino acid segment controls the essential biophysical properties of the pore and may form the conduction pathway of these potassium channels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hartmann, H A -- Kirsch, G E -- Drewe, J A -- Taglialatela, M -- Joho, R H -- Brown, A M -- NS08805/NS/NINDS NIH HHS/ -- NS23877/NS/NINDS NIH HHS/ -- NS28407/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1991 Feb 22;251(4996):942-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2000495" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Brain/physiology ; Chimera ; Cloning, Molecular ; Female ; Ion Channel Gating ; Membrane Potentials ; Molecular Sequence Data ; Oligonucleotide Probes ; Oocytes/physiology ; Polymerase Chain Reaction ; Potassium Channels/drug effects/genetics/*physiology ; Rats ; Restriction Mapping ; Sequence Homology, Nucleic Acid ; Tetraethylammonium ; Tetraethylammonium Compounds/pharmacology ; Xenopus
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  • 90
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    Deregulation of a homeobox gene, HOX11, by the t(10;14) in T cell leukemia (1991)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1991-07-05
    Description: Molecular cloning of the t(10;14)(q24;q11) recurrent breakpoint of T cell acute lymphoblastic leukemia has demonstrated a transcript for the candidate gene TCL3. Characterization of this gene from chromosome segment 10q24 revealed it to be a new homeobox, HOX11. The HOX11 homeodomain is most similar to that of the murine gene Hlx and possesses a markedly glycine-rich variable region and an acidic carboxyl terminus. HOX11, while expressed in liver, was not detected in normal thymus or T cells. This lineage-restricted homeobox gene is deregulated upon translocation into the T cell receptor locus where it may act as an oncogene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hatano, M -- Roberts, C W -- Minden, M -- Crist, W M -- Korsmeyer, S J -- 1 PO1 CA49712/CA/NCI NIH HHS/ -- CA 21765/CA/NCI NIH HHS/ -- CA 30969/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 5;253(5015):79-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1676542" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Blotting, Northern ; Chromosomes, Human, Pair 10 ; Chromosomes, Human, Pair 14 ; Cloning, Molecular ; *Gene Expression Regulation, Neoplastic ; *Genes, Homeobox ; Humans ; Leukemia-Lymphoma, Adult T-Cell/*genetics ; Mice ; Molecular Sequence Data ; Receptors, Antigen, T-Cell/genetics ; Restriction Mapping ; Sequence Homology, Nucleic Acid ; *Translocation, Genetic
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  • 91
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    Selective activation of the B natriuretic peptide receptor by C-type natriuretic peptide (CNP) (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-04-05
    Description: The natriuretic peptides are hormones that can stimulate natriuretic, diuretic, and vasorelaxant activity in vivo, presumably through the activation of two known cell surface receptor guanylyl cyclases (ANPR-A and ANPR-B). Although atrial natriuretic peptide (ANP) and, to a lesser extent, brain natriuretic peptide (BNP) are efficient activators of the ANPR-A guanylyl cyclase, neither hormone can significantly stimulate ANPR-B. A member of this hormone family, C-type natriuretic peptide (CNP), potently and selectively activated the human ANPR-B guanylyl cyclase. CNP does not increase guanosine 3',5'-monophosphate accumulation in cells expressing human ANPR-A. The affinity of CNP for ANPR-B is 50- or 500-fold higher than ANP or BNP, respectively. This ligand-receptor pair may be involved in the regulation of fluid homeostasis by the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koller, K J -- Lowe, D G -- Bennett, G L -- Minamino, N -- Kangawa, K -- Matsuo, H -- Goeddel, D V -- New York, N.Y. -- Science. 1991 Apr 5;252(5002):120-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Genentech, Inc., South San Francisco 94080.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1672777" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Atrial Natriuretic Factor/*physiology ; Cells, Cultured ; Cercopithecus aethiops ; Cloning, Molecular ; Dose-Response Relationship, Drug ; Guanylate Cyclase/metabolism ; Humans ; Natriuretic Peptide, Brain ; Natriuretic Peptide, C-Type ; Nerve Tissue Proteins/*pharmacology ; Receptors, Atrial Natriuretic Factor ; Receptors, Cell Surface/*physiology ; Recombinant Proteins ; Signal Transduction
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  • 92
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    Targets for dioxin: genes for plasminogen activator inhibitor-2 and interleukin-1 beta (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-10-18
    Description: Dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, TCDD), a widespread environmental contaminant, may elicit its effects by altering gene expression in susceptible cells. Five TCDD-responsive complementary DNA clones were isolated from a human keratinocyte cell line. One of these clones encodes plasminogen activator inhibitor-2, a factor that influences growth and differentiation by regulating proteolysis of the extracellular matrix. Another encodes the cytokine interleukin-1 beta. Thus, TCDD alters the expression of growth regulatory genes and has effects similar to those of other tumor-promoting agents that affect both inflammation and differentiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sutter, T R -- Guzman, K -- Dold, K M -- Greenlee, W F -- New York, N.Y. -- Science. 1991 Oct 18;254(5030):415-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Chemical Industry Institute of Toxicology, Research Triangle Park, NC 27709.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925598" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Blood Physiological Phenomena ; Blotting, Northern ; Calcium/pharmacology ; Cell Line ; Cloning, Molecular ; Cycloheximide/pharmacology ; Gene Expression Regulation/drug effects ; Humans ; Interleukin-1/*genetics ; *Plasminogen Inactivators ; RNA, Messenger/drug effects ; Tetrachlorodibenzodioxin/*pharmacology ; Transcription, Genetic/drug effects
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 93
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    Cloning of a factor required for activity of the Ah (dioxin) receptor (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-17
    Description: The aryl hydrocarbon (Ah) receptor binds various environmental pollutants, such as polycyclic aromatic hydrocarbons, heterocyclic amines, and polychlorinated aromatic compounds (dioxins, dibenzofurans, and biphenyls), and mediates the carcinogenic effects of these agents. The complementary DNA and part of the gene for an 87-kilodalton human protein that is necessary for Ah receptor function have been cloned. The protein is not the ligand-binding subunit of the receptor but is a factor that is required for the ligand-binding subunit to translocate from the cytosol to the nucleus after binding ligand. The requirement for this factor distinguishes the Ah receptor from the glucocorticoid receptor, to which the Ah receptor has been presumed to be similar. Two portions of the 87-kilodalton protein share sequence similarities with two Drosophila proteins, Per and Sim. Another segment of the protein shows conformity to the consensus sequence for the basic helix-loop-helix motif found in proteins that bind DNA as homodimers or heterodimers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, E C -- Reyes, H -- Chu, F F -- Sander, F -- Conley, L H -- Brooks, B A -- Hankinson, O -- CA 16048/CA/NCI NIH HHS/ -- CA 28868/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 May 17;252(5008):954-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of California, Los Angeles 90024.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1852076" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Aryl Hydrocarbon Receptor Nuclear Translocator ; Base Sequence ; Cell Line ; Cell Nucleus/metabolism ; Cloning, Molecular ; Cytosol/metabolism ; *DNA-Binding Proteins ; Humans ; Macromolecular Substances ; Molecular Sequence Data ; Molecular Weight ; Oligonucleotide Probes ; Proteins/*genetics/metabolism ; RNA, Messenger/genetics ; Receptors, Aryl Hydrocarbon ; Receptors, Drug/genetics/*metabolism ; Sequence Homology, Nucleic Acid ; Tetrachlorodibenzodioxin/*metabolism ; *Transcription Factors ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 94
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    Regulation of the apolipoprotein AI gene by ARP-1, a novel member of the steroid receptor superfamily (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-01
    Description: Apolipoprotein AI (apoAI) is a lipid-binding protein that participates in the transport of cholesterol and other lipids in the plasma. A complementary DNA clone for a protein that bound to regulatory elements of the apoAI gene was isolated. This protein, designated apoAI regulatory protein-1 (ARP-1), is a novel member of the steroid hormone receptor superfamily. ARP-1 bound to DNA as a dimer, and its dimerization domain was localized to the COOH-terminal region. ARP-1 also bound to a thyroid hormone-responsive element and to regulatory regions of the apoB, apoCIII, insulin, and ovalbumin genes. In cotransfection experiments, ARP-1 downregulated the apoAI gene. The involvement of ARP-1 in the regulation of apoAI gene expression suggests that it may participate in lipid metabolism and cholesterol homeostasis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ladias, J A -- Karathanasis, S K -- New York, N.Y. -- Science. 1991 Feb 1;251(4993):561-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cardiology, Children's Hospital, Boston, MA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1899293" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Apolipoprotein A-I ; Apolipoproteins A/*genetics ; Base Sequence ; COUP Transcription Factor II ; COUP Transcription Factors ; Cloning, Molecular ; DNA/metabolism ; DNA-Binding Proteins/*metabolism ; Gene Expression Regulation ; Humans ; Lipoproteins, HDL/*genetics ; Molecular Sequence Data ; Oligonucleotide Probes ; Receptors, Steroid/*metabolism ; Regulatory Sequences, Nucleic Acid ; *Transcription Factors
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 95
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    Identification of Ets- and notch-related subunits in GA binding protein (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-08-16
    Description: Recombinant cDNA clones that encode two distinct subunits of the transcription factor GA binding protein (GABP) have been isolated. The predicted amino acid sequence of one subunit, GABP alpha, exhibits similarity to the sequence of the product of the ets-1 protooncogene in a region known to encompass the Ets DNA binding domain. The sequence of the second subunit, GABP beta, contains four 33-amino acid repeats located close to the NH2-terminus of the subunit. The sequences of these repeats are similar to repeats in several transmembrane proteins, including Notch from Drosophila melanogaster and Glp-1 and Lin-12 from Caenorhabditis elegans. Avid, sequence-specific binding to DNA required the presence of both polypeptides, revealing a conceptual convergence of nuclear transforming proteins and membrane-anchored proteins implicated in developmentally regulated signal transduction processes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉LaMarco, K -- Thompson, C C -- Byers, B P -- Walton, E M -- McKnight, S L -- New York, N.Y. -- Science. 1991 Aug 16;253(5021):789-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Research Laboratories, Carnegie Institution of Washington, Department of Embryology, Baltimore, MD 21210.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1876836" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Blotting, Northern ; Cloning, Molecular ; DNA-Binding Proteins/*chemistry/genetics ; GA-Binding Protein Transcription Factor ; Gene Expression ; Molecular Sequence Data ; Nuclear Proteins/chemistry/genetics ; Peptides/chemistry ; Proto-Oncogene Protein c-ets-1 ; Proto-Oncogene Proteins/chemistry ; Proto-Oncogene Proteins c-ets ; RNA, Messenger/genetics ; Rats ; Recombinant Proteins ; Transcription Factors/*chemistry/genetics
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 96
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    A component of calcium-activated potassium channels encoded by the Drosophila slo locus (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-08-02
    Description: Calcium-activated potassium channels mediate many biologically important functions in electrically excitable cells. Despite recent progress in the molecular analysis of voltage-activated K+ channels, Ca(2+)-activated K+ channels have not been similarly characterized. The Drosophila slowpoke (slo) locus, mutations of which specifically abolish a Ca(2+)-activated K+ current in muscles and neurons, provides an opportunity for molecular characterization of these channels. Genomic and complementary DNA clones from the slo locus were isolated and sequenced. The polypeptide predicted by slo is similar to voltage-activated K+ channel polypeptides in discrete domains known to be essential for function. Thus, these results indicate that slo encodes a structural component of Ca(2+)-activated K+ channels.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Atkinson, N S -- Robertson, G A -- Ganetzky, B -- NS15390/NS/NINDS NIH HHS/ -- T32 GM07131/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 Aug 2;253(5019):551-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Genetics, University of Wisconsin, Madison 53706.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1857984" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Calcium/pharmacology ; Chromosome Aberrations ; Chromosome Deletion ; Cloning, Molecular ; DNA/genetics/isolation & purification ; Drosophila/*genetics/physiology ; Exons ; Molecular Sequence Data ; Nucleic Acid Hybridization ; Phenotype ; Potassium Channels/drug effects/*genetics/physiology ; Protein Conformation ; Sequence Homology, Nucleic Acid ; Transcription, Genetic ; Translocation, Genetic
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 97
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    FTZ-F1, a steroid hormone receptor-like protein implicated in the activation of fushi tarazu (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-10
    Description: The Drosophila homeobox segmentation gene fushi tarazu (ftz) is expressed in a seven-stripe pattern during early embryogenesis. This characteristic pattern is largely specified by the zebra element located immediately upstream of the ftz transcriptional start site. The FTZ-F1 protein, one of multiple DNA binding factors that interacts with the zebra element, is implicated in the activation of ftz transcription, especially in stripes 1, 2, 3, and 6. An FTZ-F1 complementary DNA has been cloned by recognition site screening of a Drosophila expression library. The identity of the FTZ-F1 complementary DNA clone was confirmed by immunological cross-reaction with antibodies to FTZ-F1 and by sequence analysis of peptides from purified FTZ-F1 protein. The predicted amino acid sequence of FTZ-F1 revealed that the protein is a member of the nuclear hormone receptor superfamily. This finding raises the possibility that a hormonal ligand affects the expression of a homeobox segmentation gene early in embryonic development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lavorgna, G -- Ueda, H -- Clos, J -- Wu, C -- New York, N.Y. -- Science. 1991 May 10;252(5007):848-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Biochemistry, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1709303" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Blotting, Northern ; Blotting, Southern ; Blotting, Western ; Chromosome Mapping ; Cloning, Molecular ; Drosophila Proteins ; Drosophila melanogaster ; Fushi Tarazu Transcription Factors ; Gene Expression Regulation ; Genes, Homeobox ; *Homeodomain Proteins ; Insect Hormones/*chemistry ; Molecular Sequence Data ; Open Reading Frames ; RNA/analysis ; Receptors, Steroid/genetics ; Sequence Homology, Nucleic Acid ; Transcription, Genetic ; Zinc Fingers
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  • 98
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    Isolation of a rel-related human cDNA that potentially encodes the 65-kD subunit of NF-kappa B (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-22
    Description: A DNA probe that spanned a domain conserved among the proto-oncogene c-rel, the Drosophila morphogen dorsal, and the p50 DNA binding subunit of NF-kappa B was generated from Jurkat T cell complementary DNA with the polymerase chain reaction (PCR) and degenerate oligonucleotides. This probe was used to identify a rel-related complementary DNA that hybridized to a 2.6-kilobase messenger RNA present in human T and B lymphocytes. In vitro transcription and translation of the complementary DNA resulted in the synthesis of a protein with an apparent molecular size of 65 kilodaltons (kD). The translated protein showed weak DNA binding with a specificity for the kappa B binding motif. This protein-DNA complex comigrated with the complex obtained with the purified human p65 NF-kappa B subunit and binding was inhibited by I kappa B-alpha and -beta proteins. In addition, the 65-kD protein associated with the p50 subunit of NF-kappa B and the kappa B probe to form a complex with the same electrophoretic mobility as the NF-kappa B-DNA complex. Therefore the rel-related 65-kD protein may represent the p65 subunit of the active NF-kappa B transcription factor complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ruben, S M -- Dillon, P J -- Schreck, R -- Henkel, T -- Chen, C H -- Maher, M -- Baeuerle, P A -- Rosen, C A -- New York, N.Y. -- Science. 1991 Mar 22;251(5000):1490-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology and Virology, Roche Institute of Molecular Biology, Roche Research Center, Nutley, NJ 07110-1199.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2006423" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Blotting, Northern ; Cloning, Molecular ; DNA/genetics ; Humans ; Macromolecular Substances ; Molecular Sequence Data ; NF-kappa B/*genetics ; Polymerase Chain Reaction ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-rel ; T-Lymphocytes
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 99
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    Expression cloning of an adenylate cyclase-coupled calcitonin receptor (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-11-25
    Description: A calcitonin receptor complementary DNA (cDNA) was cloned by expression of a cDNA library from a porcine kidney epithelial cell line in COS cells. The 482-amino acid receptor has high affinity for salmon calcitonin (dissociation constant Kd approximately 6 nM) and is functionally coupled to increases in intracellular cyclic adenosine monophosphate (cAMP). The receptor shows no sequence similarity to other reported G protein-coupled receptors but is homologous to the parathyroid hormone-parathyroid hormone-related peptide (PTH-PTHrP) receptor, indicating that the receptors for these hormones, which regulate calcium homeostasis, represent a new family of G protein-coupled receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lin, H Y -- Harris, T L -- Flannery, M S -- Aruffo, A -- Kaji, E H -- Gorn, A -- Kolakowski, L F Jr -- Lodish, H F -- Goldring, S R -- AM 03564/AM/NIADDK NIH HHS/ -- HL-41484/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1991 Nov 15;254(5034):1022-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Whitehead Institute for Biomedical Research, Cambridge, MA 02142.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1658940" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/physiology ; Amino Acid Sequence ; Animals ; Blotting, Northern ; Calcitonin/*metabolism ; Cloning, Molecular ; Cyclic AMP/physiology ; DNA/genetics ; Gene Expression ; Kidney/physiology ; Molecular Sequence Data ; RNA, Messenger/genetics ; Receptors, Calcitonin ; Receptors, Cell Surface/*genetics ; Swine
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 100
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    An immunogenic Onchocerca volvulus antigen: a specific and early marker of infection (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-29
    Description: Onchocerciasis (river blindness) is a serious health problem and a severe obstacle to social and economic development, especially in Africa. A complementary DNA fragment coding for an Onchocerca volvulus antigen (OV-16) was cloned and expressed in the plasmid vector pCG808fx. Immune responses to this O. volvulus-specific recombinant antigen were detectable in patients with documented onchocerciasis; the antibody response was also detectable at 3 months and at more than 1 year before infection could otherwise be detected in humans and in chimpanzees experimentally infected with O. volvulus third-stage larvae.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lobos, E -- Weiss, N -- Karam, M -- Taylor, H R -- Ottesen, E A -- Nutman, T B -- New York, N.Y. -- Science. 1991 Mar 29;251(5001):1603-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Parasitic Diseases, National Institutes of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2011741" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Helminth ; Antibody Specificity ; Antigens, Helminth/*analysis/genetics ; Child ; Cloning, Molecular ; Enzyme-Linked Immunosorbent Assay ; Humans ; Mali ; Onchocerca/genetics/*immunology ; Onchocerciasis/*diagnosis/immunology/prevention & control ; Pan troglodytes
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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