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  • 1
    Publication Date: 2019-11-01
    Print ISSN: 1742-6588
    Electronic ISSN: 1742-6596
    Topics: Physics
    Published by Institute of Physics
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  • 2
    Publication Date: 2013-04-10
    Description: Bone morphogenetic proteins (BMPs) are firmly implicated as intra-ovarian regulators of follicle development and steroidogenesis. Here we report a microarray analysis showing that treatment of cultured bovine theca cells (TC) with BMP6 significantly (〉twofold; P 〈 0.01) up- or down-regulated expression of 445 genes. Insulin-like peptide 3 (INSL3) was the...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 3
    Publication Date: 2014-04-03
    Description: Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) in association with CRISPR-associated (Cas) proteins constitutes a formidable defense system against mobile genetic elements in prokaryotes. In type I-C, the ribonucleoprotein surveillance complex comprises only three Cas proteins, namely, Cas5d, Csd1 and Csd2. Unlike type I-E that uses Cse3/CasE for metal-independent CRISPR RNA maturation, type I-C that lacks this deputes Cas5d to process the pre-crRNA. Here, we report the promiscuous DNase activity of Cas5d in presence of divalent metals. Remarkably, the active site that renders RNA hydrolysis may be tuned by metal to act on DNA substrates too. Further, the realization that Csd1 is a fusion of its functional homolog Cse1/CasA and Cse2/CasB forecasts that the stoichiometry of the constituents of the surveillance complex in type I-C may differ from type I-E. Although Csd2 seems to be inert, Csd1 too exhibits RNase and metal-dependent DNase activity. Thus, in addition to their proposed functions, the DNase activity of Cas5d and Csd1 may also enable them to be co-opted in adaptation and interference stages of CRISPR immunity wherein interaction with DNA substrates is involved.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
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  • 4
    Publication Date: 2012-01-07
    Description: Author(s): R. Anand Theerthan, B. Menaert, B. Boulanger, and M. Maglione [Phys. Rev. B 85, 024103] Published Fri Jan 06, 2012
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 5
    Publication Date: 2014-03-15
    Description: Recent re-analyses of lunar samples have undoubtedly measured indigenous water, challenging the paradigm of a "dry" Moon, and arguing that some portions of the lunar interior are as wet as some regions of the Earth’s mantle and that water in both planetary bodies likely share a common origin. Mare basalts indirectly sample the lunar mantle and are affected by petrogenetic processes such as crystallization and degassing that can modify characteristics of indigenous water in primary mantle melts. Analyses of apatite in phosphorus-rich KREEP (K + REE [rare earth elements] + P) basalts may provide more reliable estimates for the water content of lunar magmas, as some apatites likely crystallized before substantial degassing occurred. In lunar KREEP basalt sample 15386, apatite H 2 O content and H isotopic composition suggest that degassing occurred during apatite crystallization, the lowest D value of 90 ± 100 representing an upper limit for the isotopic composition of water in the parental magma. Interpretation of the data for KREEP basalt 15386 suggests that this basalt is characterized by relatively elevated H 2 O contents and CI chondrite–type D values, similar to those proposed for other mare basalts and pyroclastic glasses. On the other hand, most of the apatites in lunar KREEP basalt 72275 and lunar meteorite NWA 773 crystallized before degassing and H isotope fractionation, and their D/H ratios thus directly reflect those of their source regions. These apatites have an average D value of –130 ± 50, suggesting the presence of a water reservoir in the Moon characterized by moderate H 2 O contents and H isotopic composition similar to that of Earth’s interior. These findings imply that significant amounts of water in the Moon were inherited from the proto-Earth, surviving the purported Moon-forming impact event.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 6
    Publication Date: 2015-08-25
    Description: The mechanochemical protein dynamin is the prototype of the dynamin superfamily of large GTPases, which shape and remodel membranes in diverse cellular processes. Dynamin forms predominantly tetramers in the cytosol, which oligomerize at the neck of clathrin-coated vesicles to mediate constriction and subsequent scission of the membrane. Previous studies have described the architecture of dynamin dimers, but the molecular determinants for dynamin assembly and its regulation have remained unclear. Here we present the crystal structure of the human dynamin tetramer in the nucleotide-free state. Combining structural data with mutational studies, oligomerization measurements and Markov state models of molecular dynamics simulations, we suggest a mechanism by which oligomerization of dynamin is linked to the release of intramolecular autoinhibitory interactions. We elucidate how mutations that interfere with tetramer formation and autoinhibition can lead to the congenital muscle disorders Charcot-Marie-Tooth neuropathy and centronuclear myopathy, respectively. Notably, the bent shape of the tetramer explains how dynamin assembles into a right-handed helical oligomer of defined diameter, which has direct implications for its function in membrane constriction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reubold, Thomas F -- Faelber, Katja -- Plattner, Nuria -- Posor, York -- Ketel, Katharina -- Curth, Ute -- Schlegel, Jeanette -- Anand, Roopsee -- Manstein, Dietmar J -- Noe, Frank -- Haucke, Volker -- Daumke, Oliver -- Eschenburg, Susanne -- England -- Nature. 2015 Sep 17;525(7569):404-8. doi: 10.1038/nature14880. Epub 2015 Aug 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Biophysikalische Chemie, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. ; Max-Delbruck-Centrum fur Molekulare Medizin, Kristallographie, Robert-Rossle-Strasse 10, 13125 Berlin, Germany. ; Institut fur Mathematik, Freie Universitat Berlin, Arnimallee 6, 14195 Berlin, Germany. ; Leibniz-Institut fur Molekulare Pharmakologie, Robert-Rossle-Strasse 10, 13125 Berlin, Germany. ; Forschungseinrichtung Strukturanalyse, Medizinische Hochschule Hannover, Carl-Neuberg-Str. 1, 30625 Hannover, Germany. ; Institut fur Chemie und Biochemie, Freie Universitat Berlin, Takustrasse 6, 14195 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26302298" target="_blank"〉PubMed〈/a〉
    Keywords: Charcot-Marie-Tooth Disease ; Crystallography, X-Ray ; Dynamins/*antagonists & inhibitors/*chemistry/genetics/metabolism ; Humans ; Markov Chains ; Models, Molecular ; Molecular Dynamics Simulation ; Mutant Proteins/antagonists & inhibitors/chemistry/genetics/metabolism ; Mutation/genetics ; Myopathies, Structural, Congenital ; Nucleotides ; *Protein Multimerization/genetics ; Structure-Activity Relationship
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2014-06-28
    Description: Little is known about the genetic basis of convergent traits that originate repeatedly over broad taxonomic scales. The myogenic electric organ has evolved six times in fishes to produce electric fields used in communication, navigation, predation, or defense. We have examined the genomic basis of the convergent anatomical and physiological origins of these organs by assembling the genome of the electric eel (Electrophorus electricus) and sequencing electric organ and skeletal muscle transcriptomes from three lineages that have independently evolved electric organs. Our results indicate that, despite millions of years of evolution and large differences in the morphology of electric organ cells, independent lineages have leveraged similar transcription factors and developmental and cellular pathways in the evolution of electric organs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gallant, Jason R -- Traeger, Lindsay L -- Volkening, Jeremy D -- Moffett, Howell -- Chen, Po-Hao -- Novina, Carl D -- Phillips, George N Jr -- Anand, Rene -- Wells, Gregg B -- Pinch, Matthew -- Guth, Robert -- Unguez, Graciela A -- Albert, James S -- Zakon, Harold H -- Samanta, Manoj P -- Sussman, Michael R -- 1SC1GM092297-01A1/GM/NIGMS NIH HHS/ -- R01 GM084879/GM/NIGMS NIH HHS/ -- R01 GM088670/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Jun 27;344(6191):1522-5. doi: 10.1126/science.1254432.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, Michigan State University, East Lansing, MI 48824, USA. BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI 48824, USA. ; Department of Genetics, University of Wisconsin, Madison, WI 53706, USA. Biotechnology Center, University of Wisconsin, Madison, WI 53706, USA. ; Biotechnology Center, University of Wisconsin, Madison, WI 53706, USA. Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA. ; Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA. Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA. ; Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA. Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA. Broad Institute of Harvard and MIT, Cambridge, MA 02141, USA. ; Department of Biochemistry and Cell Biology and Department of Chemistry, Rice University, Houston, TX 77005, USA. ; Department of Pharmacology and Department of Neuroscience, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA. ; Department of Molecular and Cellular Medicine, Texas A&M University, College Station, TX 77483, USA. ; Department of Biology, New Mexico State University, Las Cruces, NM 88003, USA. ; Department of Biology, University of Louisiana, Lafayette, LA 70503, USA. ; BEACON Center for the Study of Evolution in Action, Michigan State University, East Lansing, MI 48824, USA. University of Texas, Austin, TX 78712, USA. The Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, The Marine Biological Laboratory, Woods Hole, MA 02543, USA. msussman@wisc.edu manoj.samanta@systemix.org h.zakon@austin.utexas.edu. ; Systemix Institute, Redmond, WA 98053, USA. msussman@wisc.edu manoj.samanta@systemix.org h.zakon@austin.utexas.edu. ; Biotechnology Center, University of Wisconsin, Madison, WI 53706, USA. Department of Biochemistry, University of Wisconsin, Madison, WI 53706, USA. msussman@wisc.edu manoj.samanta@systemix.org h.zakon@austin.utexas.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24970089" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Evolution ; Catfishes/anatomy & histology/genetics/physiology ; Cell Differentiation ; Electric Fish/anatomy & histology/*genetics/physiology ; Electric Organ/anatomy & histology/*cytology/*physiology ; Electrophorus/*anatomy & histology/*genetics/physiology ; Gene Expression Regulation ; Gene Regulatory Networks ; Muscle, Skeletal/cytology/physiology ; Phylogeny ; Transcription Factors/genetics/metabolism ; Transcriptome
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2013-08-20
    Description: In this study, we carried out Pb/Pb dating of tranquillityite in high-Ti mare basalts 10044, 75055, and 74255, using a Cameca NanoSIMS 50 at a spatial resolution of ~3 μm. The analyses yielded 207 Pb/ 206 Pb dates of 3722 ± 11 Ma for sample 10044, 3772 ± 9 Ma for sample 75055, and 3739 ± 10 Ma for sample 74255, at 95% confidence level. These dates are consistent with previously determined crystallization and emplacement ages of these samples using different radiogenic systems. These high-precision ages allow refinement of the timing of some of the high-Ti basaltic volcanism on the Moon. Crystallization ages of three different high-Ti basalt units, integrating these new Pb/Pb ages with previous Rb-Sr and Sm-Nd age determinations, are consistent with previous estimates but associated with uncertainties 3 to 5 times lower. In addition, the data obtained in this study confirm that tranquillityite contains very low amounts of initial common Pb and has a high-Pb ionization efficiency, making it an excellent candidate for Pb/Pb dating by ion microprobe. The higher spatial resolution afforded by NanoSIMS 50 and the recent discovery of tranquillityite in several terrestrial mafic rocks opens up a new area of research allowing an independent and rapid age dating of basaltic rocks in polished sections.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
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  • 9
    Publication Date: 2019
    Description: 〈p〉The integrated stress response (ISR) tunes the rate of protein synthesis. Control is exerted by phosphorylation of the general translation initiation factor eIF2. eIF2 is a guanosine triphosphatase that becomes activated by eIF2B, a two-fold symmetric and heterodecameric complex that functions as eIF2’s dedicated nucleotide exchange factor. Phosphorylation converts eIF2 from a substrate into an inhibitor of eIF2B. We report cryo–electron microscopy structures of eIF2 bound to eIF2B in the dephosphorylated state. The structures reveal that the eIF2B decamer is a static platform upon which one or two flexible eIF2 trimers bind and align with eIF2B’s bipartite catalytic centers to catalyze nucleotide exchange. Phosphorylation refolds eIF2α, allowing it to contact eIF2B at a different interface and, we surmise, thereby sequestering it into a nonproductive complex.〈/p〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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