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  • 1
    Publication Date: 2002-12-21
    Description: The immunoglobulin G (IgG)-containing B lymphocyte antigen receptor (IgG-BCR) transmits a signal distinct from that of IgM-BCR or IgD-BCR, although all three use the same signal-transducing component, Igalpha/Igbeta. Here we demonstrate that the inhibitory coreceptor CD22 down-modulates signaling through IgM-BCR and IgD-BCR, but not that through IgG-BCR, because of the IgG cytoplasmic tail, which prevents CD22 phosphorylation. These results suggest that the cytoplasmic tail of IgG specifically enhances IgG-BCR signaling by preventing CD22-mediated signal inhibition. Enhanced signaling through IgG-BCR may be involved in efficient IgG production, which is crucial for immunity to pathogens.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wakabayashi, Chisato -- Adachi, Takahiro -- Wienands, Jurgen -- Tsubata, Takeshi -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2392-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, 113-8510 Tokyo, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493916" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Antigens, Differentiation, B-Lymphocyte/metabolism ; B-Lymphocytes/immunology/metabolism ; Calcium/metabolism ; Calcium Signaling ; *Cell Adhesion Molecules ; Cells, Cultured ; Immunoglobulin D/immunology/metabolism ; Immunoglobulin G/chemistry/immunology/*metabolism ; Intracellular Signaling Peptides and Proteins ; Lectins/metabolism ; Mice ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinase 3 ; Mitogen-Activated Protein Kinases/metabolism ; Phosphorylation ; Protein Tyrosine Phosphatase, Non-Receptor Type 6 ; Protein Tyrosine Phosphatases/metabolism ; Receptors, Antigen, B-Cell/chemistry/immunology/*metabolism ; Sialic Acid Binding Ig-like Lectin 2 ; *Signal Transduction ; Transfection ; 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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  • 2
    Publication Date: 2002-12-21
    Description: Acetyl-coenzyme A (CoA) synthetase (Acs) is an enzyme central to metabolism in prokaryotes and eukaryotes. Acs synthesizes acetyl CoA from acetate, adenosine triphosphate, and CoA through an acetyl-adenosine monophosphate (AMP) intermediate. Immunoblotting and mass spectrometry analysis showed that Salmonella enterica Acs enzyme activity is posttranslationally regulated by acetylation of lysine-609. Acetylation blocks synthesis of the adenylate intermediate but does not affect the thioester-forming activity of the enzyme. Activation of the acetylated enzyme requires the nicotinamide adenine dinucleotide-dependent protein deacetylase activity of the CobB Sir2 protein from S. enterica. We propose that acetylation modulates the activity of all the AMP-forming family of enzymes, including nonribosomal peptide synthetases, luciferase, and aryl- and acyl-CoA synthetases. These findings extend our knowledge of the roles of Sir2 proteins in gene silencing, chromosome stability, and cell aging and imply that lysine acetylation is a common regulatory mechanism in eukaryotes and prokaryotes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Starai, V J -- Celic, I -- Cole, R N -- Boeke, J D -- Escalante-Semerena, J C -- 1S10-RR14702/RR/NCRR NIH HHS/ -- GM62203/GM/NIGMS NIH HHS/ -- GM62385/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2390-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Bacteriology, University of Wisconsin, Madison, WI 53706-1567, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493915" target="_blank"〉PubMed〈/a〉
    Keywords: Acetate-CoA Ligase/chemistry/genetics/*metabolism ; Acetylation ; Acyl Coenzyme A/metabolism ; Adenosine Monophosphate/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Bacterial Proteins/*metabolism ; Binding Sites ; Coenzyme A/metabolism ; Conserved Sequence ; Enzyme Activation ; Gene Expression Regulation, Bacterial ; Immunoblotting ; Lysine/*metabolism ; Mass Spectrometry ; NAD/metabolism ; Peptide Mapping ; Salmonella enterica/*enzymology/genetics ; Sirtuins/*metabolism ; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-12-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lawler, Andrew -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493882" target="_blank"〉PubMed〈/a〉
    Keywords: Academies and Institutes/economics ; Animals ; Biological Specimen Banks ; *Budgets ; California ; Ecosystem ; Oceanography ; Research/*economics ; Seawater ; Universities/*economics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 4
    Publication Date: 2002-12-21
    Description: ACT is a LIM-only protein expressed exclusively in round spermatids, where it cooperates with transcriptional activator CREM in regulating various postmeiotic genes. Targeted inactivation of CREM leads to a complete block of mouse spermiogenesis. We sought to identify the regulatory steps controlling the functional interplay between CREM and ACT. We found that ACT selectively associates with KIF17b, a kinesin highly expressed in male germ cells. The ACT-KIF17b interaction is restricted to specific stages of spermatogenesis and directly determines the intracellular localization of ACT. Sensitivity to leptomycin B indicates that KIF17b can be actively exported from the nucleus through the Crm1 receptor. Thus, a kinesin directly controls the activity of a transcriptional coactivator by a tight regulation of its intracellular localization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macho, Betina -- Brancorsini, Stefano -- Fimia, Gian Maria -- Setou, Mitsutoshi -- Hirokawa, Nobutaka -- Sassone-Corsi, Paolo -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2388-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut de Genetique et de Biologie Moleculaire et Cellulaire, B. P. 10142, 67404 Illkirch, Strasbourg, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493914" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Amino Acid Sequence ; Animals ; COS Cells ; Cell Nucleus/metabolism ; Cyclic AMP Response Element Modulator ; Cytoplasm/metabolism ; DNA-Binding Proteins/metabolism ; Fatty Acids, Unsaturated/pharmacology ; Gene Expression Regulation, Developmental ; Karyopherins/metabolism ; Kinesin/chemistry/genetics/*metabolism ; LIM Domain Proteins ; Male ; Mice ; Molecular Motor Proteins/chemistry/genetics/*metabolism ; Molecular Sequence Data ; Promoter Regions, Genetic ; Protein Isoforms/chemistry/genetics/metabolism ; *Receptors, Cytoplasmic and Nuclear ; *Repressor Proteins ; Spermatids/*metabolism ; *Spermatogenesis ; Testis/metabolism ; Transcription Factors/genetics/*metabolism ; *Transcription, Genetic ; Transcriptional Activation ; Transfection
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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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-12-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Innerarity, Thomas L -- New York, N.Y. -- Science. 2002 Dec 20;298(5602):2337-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94110, USA. tinnerarity@gladstone.ucsf.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12493900" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Apolipoprotein B-100 ; Apolipoproteins B/metabolism ; Apolipoproteins E/metabolism ; Chemistry, Physical ; Crystallization ; Crystallography, X-Ray ; Endosomes/*metabolism ; Epidermal Growth Factor/chemistry ; Humans ; Hydrogen-Ion Concentration ; Ligands ; Lipoproteins, LDL/*metabolism ; Lysosomes/metabolism ; Models, Biological ; Physicochemical Phenomena ; Protein Binding ; Protein Precursors/chemistry ; Protein Structure, Tertiary ; Receptors, LDL/*chemistry/*metabolism ; Repetitive Sequences, Amino Acid
    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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  • 6
    Publication Date: 2002-12-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Funes, Soledad -- Davidson, Edgar -- Reyes-Prieto, Adrian -- Magallon, Susana -- Herion, Pascal -- King, Michael P -- Gonzalez-Halphen, Diego -- HL59646/HL/NHLBI NIH HHS/ -- TW01176/TW/FIC NIH HHS/ -- New York, N.Y. -- Science. 2002 Dec 13;298(5601):2155.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Instituto de Fisiologia Celular, Universidad Nacional Autonoma de Mexico (UNAM), 04510 D.F., Mexico.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12481129" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Apicomplexa/enzymology/*genetics/ultrastructure ; *Biological Evolution ; Cell Nucleus/genetics ; Chlamydomonas reinhardtii/enzymology/genetics ; Chlorophyta/enzymology/*genetics ; Cloning, Molecular ; DNA, Mitochondrial/genetics ; Electron Transport Complex IV/chemistry/*genetics ; *Gene Transfer, Horizontal ; Genes ; Genes, Protozoan ; Molecular Sequence Data ; Phylogeny ; Plastids/*genetics ; Symbiosis ; Toxoplasma/enzymology/genetics
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  • 7
    Publication Date: 2002-12-14
    Description: Theory predicts the existence of barrierless protein folding. Without barriers, folding should be noncooperative and the degree of native structure should be coupled to overall protein stability. We investigated the thermal unfolding of the peripheral subunit binding domain from Escherichia coli's 2-oxoglutarate dehydrogenase multienzyme complex (termed BBL) with a combination of spectroscopic techniques and calorimetry. Each technique probed a different feature of protein structure. BBL has a defined three-dimensional structure at low temperatures. However, each technique showed a distinct unfolding transition. Global analysis with a statistical mechanical model identified BBL as a downhill-folding protein. Because of BBL's biological function, we propose that downhill folders may be molecular rheostats, in which effects could be modulated by altering the distribution of an ensemble of structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia-Mira, Maria M -- Sadqi, Mourad -- Fischer, Niels -- Sanchez-Ruiz, Jose M -- Munoz, Victor -- New York, N.Y. -- Science. 2002 Dec 13;298(5601):2191-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry and Biochemistry and Center for Biomolecular Structure and Organization, University of Maryland, College Park, MD 20742, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12481137" target="_blank"〉PubMed〈/a〉
    Keywords: Acyltransferases/*chemistry ; Calorimetry, Differential Scanning ; Circular Dichroism ; Escherichia coli/enzymology ; Fluorescence ; Fluorescence Resonance Energy Transfer ; Hydrogen-Ion Concentration ; Ketoglutarate Dehydrogenase Complex/*chemistry ; Models, Chemical ; Models, Molecular ; Multienzyme Complexes/chemistry ; Nuclear Magnetic Resonance, Biomolecular ; Protein Denaturation ; *Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Subunits ; Temperature ; Thermodynamics
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  • 8
    Publication Date: 2002-12-14
    Description: The proteasome plays a central role in the degradation of regulatory and misfolded proteins. Current models suggest that substrates access the internal catalytic sites by processively threading their termini through the gated substrate channel. Here, we found that latent (closed) and activated (open) proteasomes degraded two natively disordered substrates at internal peptide bonds even when they lacked accessible termini, suggesting that these substrates themselves promoted gating of the proteasome. This endoproteolysis provides a molecular mechanism for regulated release of transcription factors from inactive precursors as well as a means of accessing internal folding defects of misfolded multidomain proteins.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3516294/" 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/PMC3516294/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Chang-Wei -- Corboy, Michael J -- DeMartino, George N -- Thomas, Philip J -- DK46818/DK/NIDDK NIH HHS/ -- DK49835/DK/NIDDK NIH HHS/ -- R01 DK049835/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2003 Jan 17;299(5605):408-11. Epub 2002 Dec 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12481023" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclins/chemistry/*metabolism ; Cyclization ; Cysteine Endopeptidases/*metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Green Fluorescent Proteins ; Leupeptins/pharmacology ; Luminescent Proteins/chemistry/metabolism ; Multienzyme Complexes/*metabolism ; Nerve Tissue Proteins/chemistry/*metabolism ; Peptide Hydrolases/*metabolism ; Proteasome Endopeptidase Complex ; Protein Conformation ; Protein Folding ; Protein Splicing ; Protein Structure, Tertiary ; Recombinant Fusion Proteins/metabolism ; Synucleins
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  • 9
    Publication Date: 2002-12-10
    Description: Multicellular organisms have three well-characterized subfamilies of mitogen-activated protein kinases (MAPKs) that control a vast array of physiological processes. These enzymes are regulated by a characteristic phosphorelay system in which a series of three protein kinases phosphorylate and activate one another. The extracellular signal-regulated kinases (ERKs) function in the control of cell division, and inhibitors of these enzymes are being explored as anticancer agents. The c-Jun amino-terminal kinases (JNKs) are critical regulators of transcription, and JNK inhibitors may be effective in control of rheumatoid arthritis. The p38 MAPKs are activated by inflammatory cytokines and environmental stresses and may contribute to diseases like asthma and autoimmunity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, Gary L -- Lapadat, Razvan -- New York, N.Y. -- Science. 2002 Dec 6;298(5600):1911-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Colorado Health Sciences Center, Denver, CO 80262, USA. gary.johnson@uchsc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12471242" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Cell Division ; Cytokines/metabolism ; Enzyme Activation ; Gene Expression Regulation ; Humans ; MAP Kinase Kinase Kinases/metabolism ; *MAP Kinase Signaling System ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinase 10 ; Mitogen-Activated Protein Kinase 3 ; Mitogen-Activated Protein Kinase 8 ; Mitogen-Activated Protein Kinase 9 ; Mitogen-Activated Protein Kinases/*metabolism ; Neoplasms/enzymology/pathology ; Phosphorylation ; Protein-Tyrosine Kinases/metabolism ; Transcription, Genetic ; p38 Mitogen-Activated Protein Kinases
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  • 10
    Publication Date: 2002-12-10
    Description: The Frizzled-2 receptor (Rfz2) from rat binds Wnt proteins and can signal by activating calcium release from intracellular stores. We show that wild-type Rfz2 and a chimeric receptor consisting of the extracellular and transmembrane portions of the beta2-adrenergic receptor with cytoplasmic domains of Rfz2 also signaled through modulation of cyclic guanosine 3',5'-monophosphate (cGMP). Activation of either receptor led to a decline in the intracellular concentration of cGMP, a process that was inhibited in cells treated with pertussis toxin, reduced by suppression of the expression of the heterotrimeric GTP-binding protein (G protein) transducin, and suppressed through inhibition of cGMP-specific phosphodiesterase (PDE) activity. Moreover, PDE inhibitors blocked Rfz2-induced calcium transients in zebrafish embryos. Thus, Frizzled-2 appears to couple to PDEs and calcium transients through G proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ahumada, Adriana -- Slusarski, Diane C -- Liu, Xunxian -- Moon, Randall T -- Malbon, Craig C -- Wang, Hsien-yu -- T32-DK07521/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2002 Dec 6;298(5600):2006-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pharmacology, Diabetes and Metabolic Diseases Research Center, University Medical Center, SUNY-Stony Brook, Stony Brook, NY 11794-8651, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12471263" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; CHO Cells ; Calcium/metabolism ; Cricetinae ; Culture Media, Conditioned ; Cyclic GMP/*metabolism ; Embryo, Nonmammalian/metabolism ; Frizzled Receptors ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Molecular Sequence Data ; Pertussis Toxin/pharmacology ; Phosphodiesterase Inhibitors/pharmacology ; Phosphoric Diester Hydrolases/*metabolism ; Rats ; Receptors, Adrenergic, beta-2/chemistry/metabolism ; Receptors, G-Protein-Coupled ; Receptors, Neurotransmitter/chemistry/*metabolism ; Recombinant Fusion Proteins/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; *Signal Transduction ; Transducin/genetics/metabolism ; Transfection ; Tumor Cells, Cultured ; Zebrafish
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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