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  • 1
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    Estimating the age of the common ancestor of men from the ZFY intron (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-05-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fu, Y X -- Li, W H -- New York, N.Y. -- Science. 1996 May 31;272(5266):1356-7; author reply 1361-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8650550" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bayes Theorem ; Biological Evolution ; Confidence Intervals ; DNA-Binding Proteins/*genetics ; *Genetics, Population ; Hominidae/*genetics ; Humans ; Introns/*genetics ; Kruppel-Like Transcription Factors ; Male ; Mutation ; Population Density ; Probability ; Time Factors ; Transcription Factors/*genetics ; Y Chromosome/*genetics
    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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  • 2
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    Identification of BIME as a subunit of the anaphase-promoting complex (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-11-15
    Description: The initiation of anaphase and exit from mitosis require the activation of a proteolytic system that ubiquitinates and degrades cyclin B. The regulated component of this system is a large ubiquitin ligase complex, termed the anaphase-promoting complex (APC) or cyclosome. Purified Xenopus laevis APC was found to be composed of eight major subunits, at least four of which became phosphorylated in mitosis. In addition to CDC27, CDC16, and CDC23, APC contained a homolog of Aspergillus nidulans BIME, a protein essential for anaphase. Because mutation of bimE can bypass the interphase arrest induced by either nimA mutation or unreplicated DNA, it appears that ubiquitination catalyzed by APC may also negatively regulate entry into mitosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Peters, J M -- King, R W -- Hoog, C -- Kirschner, M W -- New York, N.Y. -- Science. 1996 Nov 15;274(5290):1199-201.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8895470" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Anaphase ; Animals ; Aspergillus/chemistry/cytology/metabolism ; Cell Cycle Proteins/*chemistry/metabolism ; Cyclins/metabolism ; Electrophoresis, Polyacrylamide Gel ; Fungal Proteins/analysis/*chemistry/genetics/metabolism ; Ligases/*chemistry/metabolism ; *Mitosis ; Molecular Sequence Data ; Mutation ; Ovum ; Phosphorylation ; Ubiquitin-Protein Ligases ; Xenopus laevis
    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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    Stimulation of membrane ruffling and MAP kinase activation by distinct effectors of RAS (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-02-09
    Description: The RAS guanine nucleotide binding proteins activate multiple signaling events that regulate cell growth and differentiation. In quiescent fibroblasts, ectopic expression of activated H-RAS (H-RASV12, where V12 indicates valine-12) induces membrane ruffling, mitogen-activated protein (MAP) kinase activation, and stimulation of DNA synthesis. A mutant of activated H-RAS, H-RASV12C40 (where C40 indicates cysteine-40), was identified that was defective for MAP kinase activation and stimulation of DNA synthesis, but retained the ability to induce membrane ruffling. Another mutant of activated H-RAS, H-RASV12S35 (where S35 indicates serine-35), which activates MAP kinase, was defective for stimulation of membrane ruffling and induction of DNA synthesis. Expression of both mutants resulted in a stimulation of DNA synthesis that was comparable to that induced by H-RASV12. These results indicate that membrane ruffling and activation of MAP kinase represent distinct RAS effector pathways and that input from both pathways is required for the mitogenic activity of RAS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Joneson, T -- White, M A -- Wigler, M H -- Bar-Sagi, D -- CA 55360/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1996 Feb 9;271(5250):810-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Genetics and Microbiology, State University of New York at Stony Brook 11794, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8628998" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Cell Division ; Cell Line ; Cell Membrane/*ultrastructure ; DNA/biosynthesis ; Enzyme Activation ; GTP-Binding Proteins/genetics/metabolism ; Microinjections ; Mutation ; Plasmids ; Protein-Serine-Threonine Kinases/*metabolism ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins c-raf ; Rats ; Signal Transduction ; rac GTP-Binding Proteins ; ras Proteins/genetics/*metabolism
    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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  • 4
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    Antigen presentation and T cell development in H2-M-deficient mice (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-03-01
    Description: HLA-DM (DM) facilitates peptide loading of major histocompatibility complex class II molecules in human cell lines. Mice lacking functional H2-M, the mouse equivalent of DM, have normal amounts of class II molecules at the cell surface, but most of these are associated with invariant chain-derived CLIP peptides. These mice contain large numbers of CD4+ T cells, which is indicative of positive selection in the thymus. Their CD4+ cells were unresponsive to self H2-M-deficient antigen-presenting cells (APCs) but were hyperreactive to wild-type APCs. H2-M-deficient APCs failed to elicit proliferative responses from wild-type T cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fung-Leung, W P -- Surh, C D -- Liljedahl, M -- Pang, J -- Leturcq, D -- Peterson, P A -- Webb, S R -- Karlsson, L -- New York, N.Y. -- Science. 1996 Mar 1;271(5253):1278-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉R. W. Johnson Pharmaceutical Research Institute, San Diego, CA 92121, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8638109" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antigen Presentation ; Antigen-Presenting Cells/*immunology ; Antigens, Differentiation, B-Lymphocyte/immunology/metabolism ; Base Sequence ; CD4-Positive T-Lymphocytes/*immunology ; Cells, Cultured ; Gene Targeting ; Histocompatibility Antigens Class II/genetics/*immunology/metabolism ; Isoantigens/immunology ; Lymphocyte Activation ; Mice ; Molecular Sequence Data ; Mutation
    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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  • 5
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    Modulation of virulence factor expression by pathogen target cell contact (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-08-30
    Description: Upon contact with the eukaryotic cell, Yersinia pseudotuberculosis increased the rate of transcription of virulence genes (yop), as determined by in situ monitoring of light emission from individual bacteria expressing luciferase under the control of the yopE promoter. The microbe-host interaction triggered export of LcrQ, a negative regulator of Yop expression, via the Yop-type III secretion system. The intracellular concentration of LcrQ was thereby lowered, resulting in increased expression of Yops. These results suggest a key role for the type III secretion system of pathogenic bacteria to coordinate secretion with expression of virulence factors after physical contact with the target cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pettersson, J -- Nordfelth, R -- Dubinina, E -- Bergman, T -- Gustafsson, M -- Magnusson, K E -- Wolf-Watz, H -- New York, N.Y. -- Science. 1996 Aug 30;273(5279):1231-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Molecular Biology, University of Umea, S-901 87 Umea, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8703058" target="_blank"〉PubMed〈/a〉
    Keywords: *Bacterial Adhesion ; Bacterial Outer Membrane Proteins/biosynthesis/*genetics/secretion ; Bacterial Proteins/genetics/*secretion ; Calcium/metabolism ; Culture Media ; Cytosol/metabolism ; *Gene Expression Regulation, Bacterial ; HeLa Cells ; Humans ; Mutation ; Up-Regulation ; Virulence/*genetics ; Yersinia pseudotuberculosis/genetics/metabolism/*pathogenicity
    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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  • 6
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    Cooperative DNA binding and sequence-selective recognition conferred by the STAT amino-terminal domain (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-08-09
    Description: STAT proteins (signal transducers and activators of transcription) activate distinct target genes despite having similar DNA binding preferences. The transcriptional specificity of STAT proteins was investigated on natural STAT binding sites near the interferon-gamma gene. These sites are arranged in multiple copies and required cooperative interactions for STAT binding. The conserved amino-terminal domain of STAT proteins was required for cooperative DNA binding, although this domain was not essential for dimerization or binding to a single site. Cooperative binding interactions enabled the STAT proteins to recognize variations of the consensus site. These sites can be specific for the different STAT proteins and may function to direct selective transcriptional activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, X -- Sun, Y L -- Hoey, T -- New York, N.Y. -- Science. 1996 Aug 9;273(5276):794-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Tularik, Two Corporate Drive, South San Francisco, CA 94080, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8670419" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; Binding Sites ; Cell Line ; DNA/*metabolism ; DNA-Binding Proteins/chemistry/immunology/*metabolism ; Interferon-gamma/genetics ; Introns ; Molecular Sequence Data ; Mutation ; Oligodeoxyribonucleotides/metabolism ; Promoter Regions, Genetic ; STAT1 Transcription Factor ; STAT4 Transcription Factor ; Sequence Deletion ; Signal Transduction ; Trans-Activators/chemistry/immunology/*metabolism ; *Transcriptional Activation
    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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  • 7
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    Functional evidence for indirect recognition of G.U in tRNA(Ala) by alanyl-tRNA synthetase (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-01-12
    Description: The structural features of the G.U wobble pair in Escherichia coli alanine transfer RNA (tRNA(Ala)) that are associated with aminoacylation by alanyl-tRNA synthetase (AlaRS) were investigated in vivo for wild-type tRNA(Ala) and mutant tRNAs with G.U substitutions. tRNA(Ala) with G.U, C.A, or G.A gave similar amounts of charged tRNA(Ala) and supported viability of E. coli lacking chromosomal tRNA(Ala) genes. tRNA(Ala) with G.C was inactive. Recognition of G.U by AlaRS thus requires more than the functional groups on G.U in a regular helix and may involve detection of a helical distortion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gabriel, K -- Schneider, J -- McClain, W H -- GM42123/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1996 Jan 12;271(5246):195-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, University of Wisconsin, Madison 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8539617" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine-tRNA Ligase/*metabolism ; Anticodon ; Base Composition ; Base Sequence ; Escherichia coli/genetics/growth & development ; Genes, Bacterial ; Guanine/chemistry ; Molecular Sequence Data ; Mutation ; Nucleic Acid Conformation ; Plasmids ; RNA, Transfer, Ala/chemistry/genetics/*metabolism ; Uracil/chemistry
    Print ISSN: 0036-8075
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  • 8
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    G protein-mediated neuronal DNA fragmentation induced by familial Alzheimer's disease-associated mutants of APP (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-05-31
    Description: Missense mutations in the 695-amino acid form of the amyloid precursor protein (APP695) cosegregate with disease phenotype in families with dominantly inherited Alzheimer's disease. These mutations convert valine at position 642 to isoleucine, phenylalanine, or glycine. Expression of these mutant proteins, but not of normal APP695, was shown to induce nucleosomal DNA fragmentation in neuronal cells. Induction of DNA fragmentation required the cytoplasmic domain of the mutants and appeared to be mediated by heterotrimeric guanosine triphosphate-binding proteins (G proteins).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yamatsuji, T -- Matsui, T -- Okamoto, T -- Komatsuzaki, K -- Takeda, S -- Fukumoto, H -- Iwatsubo, T -- Suzuki, N -- Asami-Odaka, A -- Ireland, S -- Kinane, T B -- Giambarella, U -- Nishimoto, I -- New York, N.Y. -- Science. 1996 May 31;272(5266):1349-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiovascular Research Center, Massachusetts General Hospital, Department of Medicine, Harvard Medical School, Charlestown, MA 02129, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8650548" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/*genetics/metabolism ; Amyloid beta-Peptides/metabolism ; Amyloid beta-Protein Precursor/chemistry/genetics/*physiology ; Animals ; Apoptosis ; Base Sequence ; Culture Media, Conditioned ; DNA/*metabolism ; GTP-Binding Proteins/*physiology ; Humans ; Hybrid Cells ; Mice ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Mutation ; Neurons/cytology/*metabolism ; Nucleosomes/*metabolism ; Peptide Fragments/metabolism ; Rats ; 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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  • 9
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    Checkpoints take the next step (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-01-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carr, A M -- New York, N.Y. -- Science. 1996 Jan 19;271(5247):314-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Cell Mutation Unit, Sussex University, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8553064" target="_blank"〉PubMed〈/a〉
    Keywords: Ataxia Telangiectasia Mutated Proteins ; *Cell Cycle ; *Cell Cycle Proteins ; Checkpoint Kinase 2 ; *DNA Damage ; DNA Replication ; DNA-Binding Proteins ; Humans ; *Mitosis ; Mutation ; Phosphorylation ; Protein Kinases/genetics/*metabolism ; *Protein-Serine-Threonine Kinases ; Proteins/genetics/metabolism ; Saccharomyces cerevisiae/cytology/metabolism ; *Saccharomyces cerevisiae Proteins ; Schizosaccharomyces/cytology/metabolism ; Signal Transduction ; Tumor Suppressor Proteins
    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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    Sterol esterification in yeast: a two-gene process (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-05-31
    Description: Unesterified sterol modulates the function of eukaryotic membranes. In human cells, sterol is esterified to a storage form by acyl-coenzyme A (CoA): cholesterol acyl transferase (ACAT). Here, two genes are identified, ARE1 and ARE2, that encode ACAT-related enzymes in yeast. The yeast enzymes are 49 percent identical to each other and exhibit 23 percent identity to human ACAT. Deletion of ARE2 reduced sterol ester levels to approximately 25 percent of normal levels, whereas disruption of ARE1 did not affect sterol ester biosynthesis. Deletion of both genes resulted in a viable cell with undetectable esterified sterol. Measurements of [14C]acetate incorporation into saponified lipids indicated down-regulation of sterol biosynthesis in the are1 are2 mutant cells. With the use of a consensus sequence to the yeast and human genes, an additional number of the ACAT gene family was identified in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, H -- Bard, M -- Bruner, D A -- Gleeson, A -- Deckelbaum, R J -- Aljinovic, G -- Pohl, T M -- Rothstein, R -- Sturley, S L -- GM 50237/GM/NIGMS NIH HHS/ -- HG00861/HG/NHGRI NIH HHS/ -- R01 AI38598/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1996 May 31;272(5266):1353-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Human Nutrition, Columbia University College of Physicians and Surgeons, New York, 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8650549" target="_blank"〉PubMed〈/a〉
    Keywords: Acetates/metabolism ; Acyltransferases/chemistry/*genetics/metabolism ; Amino Acid Sequence ; Base Sequence ; Cell Membrane/metabolism ; Cholesterol Esters/metabolism ; Cyclin-Dependent Kinase 8 ; *Cyclin-Dependent Kinases ; DNA, Complementary/genetics ; Ergosterol/metabolism ; Esterification ; *Genes, Fungal ; Homeostasis ; Humans ; Molecular Sequence Data ; Mutation ; Oleic Acid ; Oleic Acids/metabolism ; Saccharomyces cerevisiae/*genetics/metabolism ; Saccharomyces cerevisiae Proteins ; Sterol O-Acyltransferase/*genetics/metabolism ; Sterols/*metabolism ; Transformation, Genetic
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