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  • 1
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    The structural basis of ribozyme-catalyzed RNA assembly (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-03-17
    Description: Life originated, according to the RNA World hypothesis, from self-replicating ribozymes that catalyzed ligation of RNA fragments. We have solved the 2.6 angstrom crystal structure of a ligase ribozyme that catalyzes regiospecific formation of a 5' to 3' phosphodiester bond between the 5'-triphosphate and the 3'-hydroxyl termini of two RNA fragments. Invariant residues form tertiary contacts that stabilize a flexible stem of the ribozyme at the ligation site, where an essential magnesium ion coordinates three phosphates. The structure of the active site permits us to suggest how transition-state stabilization and a general base may catalyze the ligation reaction required for prebiotic RNA assembly.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Robertson, Michael P -- Scott, William G -- New York, N.Y. -- Science. 2007 Mar 16;315(5818):1549-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for the Molecular Biology of RNA and Department of Chemistry and Biochemistry, Robert L. Sinsheimer Laboratories, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17363667" target="_blank"〉PubMed〈/a〉
    Keywords: Base Pairing ; Binding Sites ; Catalysis ; Catalytic Domain ; Crystallization ; Crystallography, X-Ray ; Directed Molecular Evolution ; Hydrogen Bonding ; Models, Molecular ; Molecular Conformation ; Nucleic Acid Conformation ; Oligoribonucleotides/chemistry/metabolism ; RNA, Catalytic/*chemistry/metabolism ; Ribonucleotides/chemistry/metabolism ; Templates, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Menin controls growth of pancreatic beta-cells in pregnant mice and promotes gestational diabetes mellitus (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-11-03
    Description: During pregnancy, maternal pancreatic islets grow to match dynamic physiological demands, but the mechanisms regulating adaptive islet growth in this setting are poorly understood. Here we show that menin, a protein previously characterized as an endocrine tumor suppressor and transcriptional regulator, controls islet growth in pregnant mice. Pregnancy stimulated proliferation of maternal pancreatic islet beta-cells that was accompanied by reduced islet levels of menin and its targets. Transgenic expression of menin in maternal beta-cells prevented islet expansion and led to hyperglycemia and impaired glucose tolerance, hallmark features of gestational diabetes. Prolactin, a hormonal regulator of pregnancy, repressed islet menin levels and stimulated beta-cell proliferation. These results expand our understanding of mechanisms underlying diabetes pathogenesis and reveal potential targets for therapy in diabetes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Karnik, Satyajit K -- Chen, Hainan -- McLean, Graeme W -- Heit, Jeremy J -- Gu, Xueying -- Zhang, Andrew Y -- Fontaine, Magali -- Yen, Michael H -- Kim, Seung K -- T32DK007217-32/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2007 Nov 2;318(5851):806-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Biology, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17975067" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Proliferation ; Diabetes, Gestational/*etiology/metabolism ; Female ; Humans ; Insulin/metabolism ; Insulin-Secreting Cells/*physiology ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Obesity/metabolism ; Pregnancy ; Prolactin/metabolism ; Proto-Oncogene Proteins/*physiology ; Tumor Cells, Cultured
    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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  • 3
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    Genome-wide association analysis identifies loci for type 2 diabetes and triglyceride levels (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-04-28
    Description: New strategies for prevention and treatment of type 2 diabetes (T2D) require improved insight into disease etiology. We analyzed 386,731 common single-nucleotide polymorphisms (SNPs) in 1464 patients with T2D and 1467 matched controls, each characterized for measures of glucose metabolism, lipids, obesity, and blood pressure. With collaborators (FUSION and WTCCC/UKT2D), we identified and confirmed three loci associated with T2D-in a noncoding region near CDKN2A and CDKN2B, in an intron of IGF2BP2, and an intron of CDKAL1-and replicated associations near HHEX and in SLC30A8 found by a recent whole-genome association study. We identified and confirmed association of a SNP in an intron of glucokinase regulatory protein (GCKR) with serum triglycerides. The discovery of associated variants in unsuspected genes and outside coding regions illustrates the ability of genome-wide association studies to provide potentially important clues to the pathogenesis of common diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diabetes Genetics Initiative of Broad Institute of Harvard and MIT, Lund University, and Novartis Institutes of BioMedical Research -- Saxena, Richa -- Voight, Benjamin F -- Lyssenko, Valeriya -- Burtt, Noel P -- de Bakker, Paul I W -- Chen, Hong -- Roix, Jeffrey J -- Kathiresan, Sekar -- Hirschhorn, Joel N -- Daly, Mark J -- Hughes, Thomas E -- Groop, Leif -- Altshuler, David -- Almgren, Peter -- Florez, Jose C -- Meyer, Joanne -- Ardlie, Kristin -- Bengtsson Bostrom, Kristina -- Isomaa, Bo -- Lettre, Guillaume -- Lindblad, Ulf -- Lyon, Helen N -- Melander, Olle -- Newton-Cheh, Christopher -- Nilsson, Peter -- Orho-Melander, Marju -- Rastam, Lennart -- Speliotes, Elizabeth K -- Taskinen, Marja-Riitta -- Tuomi, Tiinamaija -- Guiducci, Candace -- Berglund, Anna -- Carlson, Joyce -- Gianniny, Lauren -- Hackett, Rachel -- Hall, Liselotte -- Holmkvist, Johan -- Laurila, Esa -- Sjogren, Marketa -- Sterner, Maria -- Surti, Aarti -- Svensson, Margareta -- Svensson, Malin -- Tewhey, Ryan -- Blumenstiel, Brendan -- Parkin, Melissa -- Defelice, Matthew -- Barry, Rachel -- Brodeur, Wendy -- Camarata, Jody -- Chia, Nancy -- Fava, Mary -- Gibbons, John -- Handsaker, Bob -- Healy, Claire -- Nguyen, Kieu -- Gates, Casey -- Sougnez, Carrie -- Gage, Diane -- Nizzari, Marcia -- Gabriel, Stacey B -- Chirn, Gung-Wei -- Ma, Qicheng -- Parikh, Hemang -- Richardson, Delwood -- Ricke, Darrell -- Purcell, Shaun -- F32 DK079466/DK/NIDDK NIH HHS/ -- F32 DK079466-01/DK/NIDDK NIH HHS/ -- K23 DK067288/DK/NIDDK NIH HHS/ -- K23 DK080145/DK/NIDDK NIH HHS/ -- K23 DK080145-01/DK/NIDDK NIH HHS/ -- K23 DK65978-04/DK/NIDDK NIH HHS/ -- K23-HL083102/HL/NHLBI NIH HHS/ -- U01 HG004171/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2007 Jun 1;316(5829):1331-6. Epub 2007 Apr 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Broad Institute of Harvard and Massachusetts Institute of Technology (MIT), Cambridge, MA 02142, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17463246" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/genetics ; Aged ; Alleles ; Blood Glucose/analysis ; Case-Control Studies ; Chromosome Mapping ; Chromosomes, Human, Pair 9/genetics ; Diabetes Mellitus, Type 2/*genetics ; Female ; Genetic Markers ; *Genetic Predisposition to Disease ; *Genome, Human ; Genotype ; Haplotypes ; Humans ; Insulin Resistance/genetics ; Insulin-Like Growth Factor Binding Proteins/genetics ; Introns ; Male ; Meta-Analysis as Topic ; Middle Aged ; *Polymorphism, Single Nucleotide ; Quantitative Trait, Heritable ; Triglycerides/*blood
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Complex I binding by a virally encoded RNA regulates mitochondria-induced cell death (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-06-02
    Description: Human cytomegalovirus infection perturbs multiple cellular processes that could promote the release of proapoptotic stimuli. Consequently, it encodes mechanisms to prevent cell death during infection. Using rotenone, a potent inhibitor of the mitochondrial enzyme complex I (reduced nicotinamide adenine dinucleotide-ubiquinone oxido-reductase), we found that human cytomegalovirus infection protected cells from rotenone-induced apoptosis, a protection mediated by a 2.7-kilobase virally encoded RNA (beta2.7). During infection, beta2.7 RNA interacted with complex I and prevented the relocalization of the essential subunit genes associated with retinoid/interferon-induced mortality-19, in response to apoptotic stimuli. This interaction, which is important for stabilizing the mitochondrial membrane potential, resulted in continued adenosine triphosphate production, which is critical for the successful completion of the virus' life cycle. Complex I targeting by a viral RNA represents a refined strategy to modulate the metabolic viability of the infected host cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reeves, Matthew B -- Davies, Andrew A -- McSharry, Brian P -- Wilkinson, Gavin W -- Sinclair, John H -- G0700142/Medical Research Council/United Kingdom -- G9202171/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2007 Jun 1;316(5829):1345-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge, CB2 2QQ, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17540903" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; *Apoptosis ; Apoptosis Regulatory Proteins/genetics/metabolism ; Cell Line ; Cell Line, Tumor ; Cell Nucleus/metabolism ; Cytomegalovirus/genetics/growth & development/*physiology ; Electron Transport Complex I/antagonists & inhibitors/*metabolism ; Enzyme Inhibitors/pharmacology ; Fibroblasts/metabolism/virology ; Humans ; Membrane Potential, Mitochondrial ; Mitochondria/*metabolism ; NADH, NADPH Oxidoreductases/genetics/metabolism ; Neurons/*cytology/*virology ; Oxidative Stress ; RNA, Untranslated/genetics/metabolism ; RNA, Viral/genetics/*metabolism ; Rotenone/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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