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  • 1
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    Dynamics of ribozyme binding of substrate revealed by fluorescence-detected stopped-flow methods (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-11-20
    Beschreibung: Fluorescence-detected stopped-flow and equilibrium methods have been used to study the mechanism for binding of pyrene (pyr)-labeled RNA oligomer substrates to the ribozyme (catalytic RNA) from Tetrahymena thermophila. The fluorescence of these substrates increases up to 25-fold on binding to the ribozyme. Stopped-flow experiments provide evidence that pyr experiences at least three different microenvironments during the binding process. A minimal mechanism is presented in which substrate initially base pairs to ribozyme and subsequently forms tertiary contacts in an RNA folding step. All four microscopic rate constants are measured for ribozyme binding of pyrCCUCU.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bevilacqua, P C -- Kierzek, R -- Johnson, K A -- Turner, D H -- GM 22939/GM/NIGMS NIH HHS/ -- GM44613/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1992 Nov 20;258(5086):1355-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of Rochester, NY 14627.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1455230" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Hydrogen Bonding ; Kinetics ; *RNA Splicing ; RNA, Catalytic/*metabolism ; RNA, Guide/*metabolism ; RNA, Protozoan/*metabolism ; RNA, Ribosomal/*metabolism ; Substrate Specificity ; Tetrahymena thermophila ; Thermodynamics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    A Late Triassic dinosauromorph assemblage from New Mexico and the rise of dinosaurs (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2007-07-21
    Beschreibung: It has generally been thought that the first dinosaurs quickly replaced more archaic Late Triassic faunas, either by outcompeting them or when the more archaic faunas suddenly became extinct. Fossils from the Hayden Quarry, in the Upper Triassic Chinle Formation of New Mexico, and an analysis of other regional Upper Triassic assemblages instead imply that the transition was gradual. Some dinosaur relatives preserved in this Chinle assemblage belong to groups previously known only from the Middle and lowermost Upper Triassic outside North America. Thus, the transition may have extended for 15 to 20 million years and was probably diachronous at different paleolatitudes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Irmis, Randall B -- Nesbitt, Sterling J -- Padian, Kevin -- Smith, Nathan D -- Turner, Alan H -- Woody, Daniel -- Downs, Alex -- New York, N.Y. -- Science. 2007 Jul 20;317(5836):358-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Museum of Paleontology and Department of Integrative Biology, University of California, Berkeley, CA 94720-4780, USA. irmis@berkeley.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17641198" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Dinosaurs/anatomy & histology/classification ; Femur/anatomy & histology ; *Fossils ; New Mexico ; Phylogeny ; Talus/anatomy & histology ; Tibia/anatomy & histology ; Time ; Tooth/anatomy & histology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    CRACM1 is a plasma membrane protein essential for store-operated Ca2+ entry (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2006-04-29
    Beschreibung: Store-operated Ca2+ entry is mediated by Ca2+ release-activated Ca2+ (CRAC) channels following Ca2+ release from intracellular stores. We performed a genome-wide RNA interference (RNAi) screen in Drosophila cells to identify proteins that inhibit store-operated Ca2+ influx. A secondary patch-clamp screen identified CRACM1 and CRACM2 (CRAC modulators 1 and 2) as modulators of Drosophila CRAC currents. We characterized the human ortholog of CRACM1, a plasma membrane-resident protein encoded by gene FLJ14466. Although overexpression of CRACM1 did not affect CRAC currents, RNAi-mediated knockdown disrupted its activation. CRACM1 could be the CRAC channel itself, a subunit of it, or a component of the CRAC signaling machinery.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vig, M -- Peinelt, C -- Beck, A -- Koomoa, D L -- Rabah, D -- Koblan-Huberson, M -- Kraft, S -- Turner, H -- Fleig, A -- Penner, R -- Kinet, J-P -- 5-R37-GM053950/GM/NIGMS NIH HHS/ -- R01-AI050200/AI/NIAID NIH HHS/ -- R01-GM065360/GM/NIGMS NIH HHS/ -- R01-NS040927/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2006 May 26;312(5777):1220-3. Epub 2006 Apr 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA. mvig@bidmc.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645049" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Calcium/*metabolism ; Calcium Channels/*metabolism ; Cell Line ; Cell Membrane/metabolism ; Drosophila Proteins/*genetics/*metabolism ; Drosophila melanogaster/*metabolism ; Endoplasmic Reticulum/metabolism ; Humans ; Ion Transport ; Jurkat Cells ; Membrane Proteins/genetics/*metabolism ; Patch-Clamp Techniques ; RNA Interference ; RNA, Small Interfering ; Reverse Transcriptase Polymerase Chain Reaction
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    An NAD derivative produced during transfer RNA splicing: ADP-ribose 1"-2" cyclic phosphate (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1993-07-09
    Beschreibung: Transfer RNA (tRNA) splicing is essential in Saccharomyces cerevisiae as well as in humans, and many of its features are the same in both. In yeast, the final step of this process is removal of the 2' phosphate generated at the splice junction during ligation. A nicotinamide adenine dinucleotide (NAD)-dependent phosphotransferase catalyzes removal of the 2' phosphate and produces a small molecule. It is shown here that this small molecule is an NAD derivative: adenosine diphosphate (ADP)-ribose 1"-2" cyclic phosphate. Evidence is also presented that this molecule is produced in Xenopus laevis oocytes as a result of dephosphorylation of ligated tRNA.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Culver, G M -- McCraith, S M -- Zillmann, M -- Kierzek, R -- Michaud, N -- LaReau, R D -- Turner, D H -- Phizicky, E M -- DE07202-02/DE/NIDCR NIH HHS/ -- GM 22939/GM/NIGMS NIH HHS/ -- GM 25349/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1993 Jul 9;261(5118):206-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Rochester School of Medicine and Dentistry, NY 14642.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8392224" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenosine Diphosphate Ribose/*analogs & derivatives/chemistry/metabolism ; Animals ; Cyclic ADP-Ribose ; Endoribonucleases/metabolism ; NAD/chemistry/metabolism ; Oocytes/metabolism ; Phosphates/metabolism ; Phosphorylation ; Phosphotransferases/metabolism ; *RNA Splicing ; RNA, Fungal/*metabolism ; RNA, Transfer/*metabolism ; Saccharomyces cerevisiae/*genetics ; Xenopus
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Feather quill knobs in the dinosaur Velociraptor (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2007-09-22
    Beschreibung: Some nonavian theropod dinosaurs were at least partially covered in feathers or filamentous protofeathers. However, a complete understanding of feather distribution among theropod dinosaurs is limited because feathers are typically preserved only in lagerstatten like that of Solnhofen, Germany or Liaoning, China. Such deposits possess clear taphonomic biases toward small-bodied animals, limiting our knowledge regarding feather presence in larger members of feathered clades. We present direct evidence of feathers in Velociraptor mongoliensis based on the presence of quill knobs on the posterior forearm. This report of secondaries in a larger-bodied, derived, and clearly flightless member of a nonavian theropod clade represented by feathered relatives is a substantial contribution to our knowledge of the evolution of feathers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Turner, Alan H -- Makovicky, Peter J -- Norell, Mark A -- New York, N.Y. -- Science. 2007 Sep 21;317(5845):1721.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA. turner@amnh.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17885130" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Dinosaurs/*anatomy & histology ; *Feathers ; Fossils
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    A basal dromaeosaurid and size evolution preceding avian flight (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2007-09-08
    Beschreibung: Fossil evidence for changes in dinosaurs near the lineage leading to birds and the origin of flight has been sparse. A dinosaur from Mongolia represents the basal divergence within Dromaeosauridae. The taxon's small body size and phylogenetic position imply that extreme miniaturization was ancestral for Paraves (the clade including Avialae, Troodontidae, and Dromaeosauridae), phylogenetically earlier than where flight evolution is strongly inferred. In contrast to the sustained small body sizes among avialans throughout the Cretaceous Period, the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude. Thus, change in theropod body size leading to flight's origin was not unidirectional.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Turner, Alan H -- Pol, Diego -- Clarke, Julia A -- Erickson, Gregory M -- Norell, Mark A -- New York, N.Y. -- Science. 2007 Sep 7;317(5843):1378-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192, USA. turner@amnh.org〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17823350" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; *Birds/anatomy & histology ; *Body Size ; Bone and Bones/anatomy & histology ; *Dinosaurs/anatomy & histology/classification ; *Flight, Animal ; Fossils ; Mongolia ; Phylogeny
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    A complete skeleton of a Late Triassic saurischian and the early evolution of dinosaurs (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2009-12-17
    Beschreibung: Characterizing the evolutionary history of early dinosaurs is central to understanding their rise and diversification in the Late Triassic. However, fossils from basal lineages are rare. A new theropod dinosaur from New Mexico is a representative of the early North American diversification. Known from several nearly complete skeletons, it reveals a mosaic of plesiomorphic and derived features that clarify early saurischian dinosaur evolution and provide evidence for the antiquity of novel avian character systems including skeletal pneumaticity. The taxon further reveals latitudinal differences among saurischian assemblages during the Late Triassic, demonstrates that the theropod fauna from the Late Triassic of North America was not endemic, and suggests that intercontinental dispersal was prevalent during this time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nesbitt, Sterling J -- Smith, Nathan D -- Irmis, Randall B -- Turner, Alan H -- Downs, Alex -- Norell, Mark A -- New York, N.Y. -- Science. 2009 Dec 11;326(5959):1530-3. doi: 10.1126/science.1180350.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Paleontology, American Museum of Natural History, New York, NY 10024, USA. nesbitt@jsg.utexas.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20007898" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; Bone and Bones/*anatomy & histology ; Bones of Lower Extremity/anatomy & histology ; Bones of Upper Extremity/anatomy & histology ; *Dinosaurs/anatomy & histology/classification ; *Fossils ; New Mexico ; Phylogeny ; Skeleton ; Skull/anatomy & histology ; Spine/anatomy & histology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Continuous evolution of Bacillus thuringiensis toxins overcomes insect resistance (2016)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2016-04-28
    Beschreibung: The Bacillus thuringiensis delta-endotoxins (Bt toxins) are widely used insecticidal proteins in engineered crops that provide agricultural, economic, and environmental benefits. The development of insect resistance to Bt toxins endangers their long-term effectiveness. Here we have developed a phage-assisted continuous evolution selection that rapidly evolves high-affinity protein-protein interactions, and applied this system to evolve variants of the Bt toxin Cry1Ac that bind a cadherin-like receptor from the insect pest Trichoplusia ni (TnCAD) that is not natively bound by wild-type Cry1Ac. The resulting evolved Cry1Ac variants bind TnCAD with high affinity (dissociation constant Kd = 11-41 nM), kill TnCAD-expressing insect cells that are not susceptible to wild-type Cry1Ac, and kill Cry1Ac-resistant T. ni insects up to 335-fold more potently than wild-type Cry1Ac. Our findings establish that the evolution of Bt toxins with novel insect cell receptor affinity can overcome insect Bt toxin resistance and confer lethality approaching that of the wild-type Bt toxin against non-resistant insects.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865400/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4865400/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Badran, Ahmed H -- Guzov, Victor M -- Huai, Qing -- Kemp, Melissa M -- Vishwanath, Prashanth -- Kain, Wendy -- Nance, Autumn M -- Evdokimov, Artem -- Moshiri, Farhad -- Turner, Keith H -- Wang, Ping -- Malvar, Thomas -- Liu, David R -- R01 EB022376/EB/NIBIB NIH HHS/ -- R01EB022376/EB/NIBIB NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2016 May 5;533(7601):58-63. doi: 10.1038/nature17938. Epub 2016 Apr 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA. ; Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts 02138, USA. ; Monsanto Company, 245 First Street, Suite 200, Cambridge, Massachusetts 02142, USA. ; Department of Entomology, Cornell University, Geneva, New York 14456, USA. ; Monsanto Company, 700 Chesterfield Parkway West, Chesterfield, Missouri 63017, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/27120167" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; Bacillus thuringiensis/*genetics ; Bacterial Proteins/*genetics/*metabolism ; Bacteriophages/genetics ; Biotechnology ; Cadherins/metabolism ; Cell Death ; Consensus Sequence ; Crops, Agricultural/genetics/metabolism ; Directed Molecular Evolution/*methods ; Endotoxins/*genetics/*metabolism ; Genetic Variation/*genetics ; Hemolysin Proteins/*genetics/*metabolism ; *Insecticide Resistance ; Insecticides/metabolism ; Molecular Sequence Data ; Moths/cytology/*physiology ; Mutagenesis/genetics ; Pest Control, Biological/*methods ; Plants, Genetically Modified ; Protein Binding/genetics ; Protein Stability ; Selection, Genetic
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Erwartet Verfügbarkeit
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