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  • Mice  (42)
  • Binding Sites  (29)
  • Mutation
  • 1995-1999  (57)
  • 1990-1994  (23)
  • 1
    Publication Date: 1991-04-05
    Description: The crystal structure of the ribonuclease (RNase) H domain of HIV-1 reverse transcriptase (RT) has been determined at a resolution of 2.4 A and refined to a crystallographic R factor of 0.20. The protein folds into a five-stranded mixed beta sheet flanked by an asymmetric distribution of four alpha helices. Two divalent metal cations bind in the active site surrounded by a cluster of four conserved acidic amino acid residues. The overall structure is similar in most respects to the RNase H from Escherichia coli. Structural features characteristic of the retroviral protein suggest how it may interface with the DNA polymerase domain of p66 in the mature RT heterodimer. These features also offer insights into why the isolated RNase H domain is catalytically inactive but when combined in vitro with the isolated p51 domain of RT RNase H activity can be reconstituted. Surprisingly, the peptide bond cleaved by HIV-1 protease near the polymerase-RNase H junction of p66 is completely inaccessible to solvent in the structure reported here. This suggests that the homodimeric p66-p66 precursor of mature RT is asymmetric with one of the two RNase H domains at least partially unfolded.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davies, J F 2nd -- Hostomska, Z -- Hostomsky, Z -- Jordan, S R -- Matthews, D A -- GM 39599/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1991 Apr 5;252(5002):88-95.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Agouron Pharmaceuticals, Inc., La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1707186" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Computer Graphics ; Crystallography ; Endoribonucleases/chemistry/*ultrastructure ; Escherichia coli/enzymology ; HIV-1/*enzymology ; Manganese/metabolism ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; RNA-Directed DNA Polymerase/chemistry/*ultrastructure ; Ribonuclease H ; Structure-Activity Relationship ; X-Ray Diffraction
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    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 1994-04-01
    Description: The STAT family of proteins carries out a dual function: signal transduction and activation of transcription. A new family member, Stat3, becomes activated through phosphorylation on tyrosine as a DNA binding protein in response to epidermal growth factor (EGF) and interleukin-6 (IL-6) but not interferon gamma (IFN-gamma). It is likely that this phosphoprotein forms homodimers as well as heterodimers with the first described member of the STAT family, Stat91 (renamed Stat1 alpha), which is activated by the IFNs and EGF. Differential activation of different STAT proteins in response to different ligands should help to explain specificity in nuclear signaling from the cell surface.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhong, Z -- Wen, Z -- Darnell, J E Jr -- AI32489/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1994 Apr 1;264(5155):95-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Cell Biology, Rockefeller University, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8140422" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cell Line ; DNA/metabolism ; DNA-Binding Proteins/chemistry/genetics/isolation & purification/*metabolism ; Epidermal Growth Factor/*pharmacology ; Humans ; Interferon-gamma ; Interleukin-6/*pharmacology ; Mice ; Molecular Sequence Data ; Phosphorylation ; Regulatory Sequences, Nucleic Acid ; STAT1 Transcription Factor ; STAT3 Transcription Factor ; Sequence Alignment ; Trans-Activators/metabolism ; Transfection ; Tumor Cells, Cultured ; Tyrosine/metabolism
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  • 3
    Publication Date: 1998-03-21
    Description: Viral infection is sometimes associated with the initiation or exacerbation of autoimmune disease, although the underlying mechanisms remain unclear. One proposed mechanism is that viral determinants that mimic host antigens trigger self-reactive T cell clones to destroy host tissue. An epitope expressed by a coat protein of herpes simplex virus-type 1 (HSV-1) KOS strain has now been shown to be recognized by autoreactive T cells that target corneal antigens in a murine model of autoimmune herpes stromal keratitis. Mutant HSV-1 viruses that lacked this epitope did not induce autoimmune disease. Thus, expression of molecular mimics can influence the development of autoimmune disease after viral infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhao, Z S -- Granucci, F -- Yeh, L -- Schaffer, P A -- Cantor, H -- AI 37562/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1998 Feb 27;279(5355):1344-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Harvard Medical School, and Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9478893" target="_blank"〉PubMed〈/a〉
    Keywords: Adoptive Transfer ; Amino Acid Sequence ; Animals ; Autoantigens/immunology ; Autoimmune Diseases/*immunology ; CD4-Positive T-Lymphocytes/immunology ; Capsid/chemistry/genetics/*immunology ; *Capsid Proteins ; Cornea/*immunology ; Epitopes ; Eye Proteins/immunology ; Herpesvirus 1, Human/*immunology ; Keratitis, Herpetic/*immunology ; Lymphocyte Activation ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Mice, SCID ; *Molecular Mimicry ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Oligopeptides/immunology ; Viral Proteins
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  • 4
    Publication Date: 1999-10-09
    Description: The Yersinia pseudotuberculosis invasin protein promotes bacterial entry by binding to host cell integrins with higher affinity than natural substrates such as fibronectin. The 2.3 angstrom crystal structure of the invasin extracellular region reveals five domains that form a 180 angstrom rod with structural similarities to tandem fibronectin type III domains. The integrin-binding surfaces of invasin and fibronectin include similarly located key residues, but in the context of different folds and surface shapes. The structures of invasin and fibronectin provide an example of convergent evolution, in which invasin presents an optimized surface for integrin binding, in comparison with host substrates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hamburger, Z A -- Brown, M S -- Isberg, R R -- Bjorkman, P J -- New York, N.Y. -- Science. 1999 Oct 8;286(5438):291-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biology 156-29, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10514372" target="_blank"〉PubMed〈/a〉
    Keywords: *Adhesins, Bacterial ; Amino Acid Sequence ; Bacterial Proteins/*chemistry/metabolism ; Binding Sites ; Crystallography, X-Ray ; Evolution, Molecular ; Fibronectins/chemistry/metabolism ; Hydrogen Bonding ; Integrins/*metabolism ; Ligands ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Yersinia pseudotuberculosis/*chemistry/metabolism
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  • 5
    Publication Date: 1999-09-25
    Description: The 7.8 angstrom crystal structure of the 70S ribosome reveals a discrete double-helical bridge (B4) that projects from the 50S subunit, making contact with the 30S subunit. Preliminary modeling studies localized its contact site, near the bottom of the platform, to the binding site for ribosomal protein S15. Directed hydroxyl radical probing from iron(II) tethered to S15 specifically cleaved nucleotides in the 715 loop of domain II of 23S ribosomal RNA, one of the known sites in 23S ribosomal RNA that are footprinted by the 30S subunit. Reconstitution studies show that protection of the 715 loop, but none of the other 30S-dependent protections, is correlated with the presence of S15 in the 30S subunit. The 715 loop is specifically protected by binding free S15 to 50S subunits. Moreover, the previously determined structure of a homologous stem-loop from U2 small nuclear RNA fits closely to the electron density of the bridge.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Culver, G M -- Cate, J H -- Yusupova, G Z -- Yusupov, M M -- Noller, H F -- 1F32GM18065-01/GM/NIGMS NIH HHS/ -- GM-17129/GM/NIGMS NIH HHS/ -- GM-59140/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Sep 24;285(5436):2133-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Molecular Biology of RNA, Sinsheimer Laboratories, University of California, Santa Cruz, CA 95064, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10497132" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/chemistry/metabolism ; Binding Sites ; Crystallography, X-Ray ; Escherichia coli/chemistry ; Hydroxyl Radical ; Nucleic Acid Conformation ; Protein Conformation ; RNA, Bacterial/*chemistry/metabolism ; RNA, Ribosomal, 23S/*chemistry/metabolism ; RNA, Small Nuclear/chemistry/metabolism ; Ribosomal Proteins/chemistry/*metabolism ; Ribosomes/*chemistry/metabolism/ultrastructure ; Thermus thermophilus/chemistry
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  • 6
    Publication Date: 1998-08-14
    Description: Transcription factors of the nuclear factor-kappaB/rel (NF-kappaB) family may be important in cell survival by regulating unidentified, anti-apoptotic genes. One such gene that protects cells from apoptosis induced by Fas or tumor necrosis factor type alpha (TNF), IEX-1L, is described here. Its transcription induced by TNF was decreased in cells with defective NF-kappaB activation, rendering them sensitive to TNF-induced apoptosis, which was abolished by transfection with IEX-1L. In support, overexpression of antisense IEX-1L partially blocked TNF-induced expression of IEX-1L and sensitized normal cells to killing. This study demonstrates a key role of IEX-1L in cellular resistance to TNF-induced apoptosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, M X -- Ao, Z -- Prasad, K V -- Wu, R -- Schlossman, S F -- AI12069/AI/NIAID NIH HHS/ -- P30AI28691/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1998 Aug 14;281(5379):998-1001.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Tumor Immunology, Dana-Farber Cancer Institute, and the Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9703517" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD95/physiology ; Apoptosis/genetics/*physiology ; Apoptosis Regulatory Proteins ; Cell Line ; Cell Survival ; Cloning, Molecular ; DNA, Antisense/genetics ; Gene Expression Regulation ; Genetic Vectors ; Humans ; Immediate-Early Proteins/genetics/*physiology ; Jurkat Cells ; Membrane Glycoproteins/genetics/*physiology ; Membrane Proteins ; Mice ; NF-kappa B/*physiology ; *Neoplasm Proteins ; Transfection ; Tumor Necrosis Factor-alpha/physiology
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  • 7
    Publication Date: 1999-12-11
    Description: In vitro PA28 binds and activates proteasomes. It is shown here that mice with a disrupted PA28b gene lack PA28a and PA28b polypeptides, demonstrating that PA28 functions as a hetero-oligomer in vivo. Processing of antigenic epitopes derived from exogenous or endogenous antigens is altered in PA28-/- mice. Cytotoxic T lymphocyte responses are impaired, and assembly of immunoproteasomes is greatly inhibited in mice lacking PA28. These results show that PA28 is necessary for immunoproteasome assembly and is required for efficient antigen processing, thus demonstrating the importance of PA28-mediated proteasome function in immune responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Preckel, T -- Fung-Leung, W P -- Cai, Z -- Vitiello, A -- Salter-Cid, L -- Winqvist, O -- Wolfe, T G -- Von Herrath, M -- Angulo, A -- Ghazal, P -- Lee, J D -- Fourie, A M -- Wu, Y -- Pang, J -- Ngo, K -- Peterson, P A -- Fruh, K -- Yang, Y -- New York, N.Y. -- Science. 1999 Dec 10;286(5447):2162-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The R. W. Johnson Pharmaceutical Research Institute, 3210 Merryfield Row, San Diego, CA 92121, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10591649" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antigen Presentation ; Autoantigens ; Cysteine Endopeptidases/chemistry/*metabolism ; Enzyme Activators/*metabolism ; Epitopes, T-Lymphocyte/immunology ; Female ; H-Y Antigen/immunology ; Herpesviridae Infections/immunology ; Histocompatibility Antigens Class I/immunology/metabolism ; Interferons/pharmacology ; Lymphocytic Choriomeningitis/immunology ; Lymphocytic choriomeningitis virus/immunology ; Male ; Mice ; Multienzyme Complexes/chemistry/*metabolism ; Muromegalovirus/immunology ; Ovalbumin/immunology ; Peptide Fragments/immunology ; Proteasome Endopeptidase Complex ; Proteins/genetics/*metabolism ; T-Lymphocytes, Cytotoxic/*immunology
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  • 8
    Publication Date: 1999-07-20
    Description: A phytochrome-like protein called Ppr was discovered in the purple photosynthetic bacterium Rhodospirillum centenum. Ppr has a photoactive yellow protein (PYP) amino-terminal domain, a central domain with similarity to phytochrome, and a carboxyl-terminal histidine kinase domain. Reconstitution experiments demonstrate that Ppr covalently attaches the blue light-absorbing chromophore p-hydroxycinnamic acid and that it has a photocycle that is spectrally similar to, but kinetically slower than, that of PYP. Ppr also regulates chalcone synthase gene expression in response to blue light with autophosphorylation inhibited in vitro by blue light. Phylogenetic analysis demonstrates that R. centenum Ppr may be ancestral to cyanobacterial and plant phytochromes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Z -- Swem, L R -- Rushing, B G -- Devanathan, S -- Tollin, G -- Bauer, C E -- GM 40941/GM/NIGMS NIH HHS/ -- R01 GM040941/GM/NIGMS NIH HHS/ -- R01 GM053940/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 16;285(5426):406-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Indiana University, Jordan Hall, Bloomington, IN 47405, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10411503" target="_blank"〉PubMed〈/a〉
    Keywords: Acyltransferases/genetics ; Amino Acid Sequence ; Apoproteins/chemistry/metabolism ; Bacterial Proteins/*chemistry/genetics/physiology ; Chemotaxis ; Cloning, Molecular ; Coumaric Acids/metabolism ; Gene Expression Regulation, Bacterial ; Light ; Molecular Sequence Data ; Mutation ; Phosphorylation ; *Photoreceptors, Microbial ; Phylogeny ; Phytochrome/*chemistry ; Protein Kinases/metabolism ; Rhodospirillum/*chemistry/genetics/physiology ; Sequence Alignment
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  • 9
    Publication Date: 1999-12-22
    Description: Alzheimer's disease (AD) has a substantial inflammatory component, and activated microglia may play a central role in neuronal degeneration. CD40 expression was increased on cultured microglia treated with freshly solublized amyloid-beta (Abeta, 500 nanomolar) and on microglia from a transgenic murine model of AD (Tg APPsw). Increased tumor necrosis factor alpha production and induction of neuronal injury occurred when Abeta-stimulated microglia were treated with CD40 ligand (CD40L). Microglia from Tg APPsw mice deficient for CD40L demonstrated reduction in activation, suggesting that the CD40-CD40L interaction is necessary for Abeta-induced microglial activation. Finally, abnormal tau phosphorylation was reduced in Tg APPsw animals deficient for CD40L, suggesting that the CD40-CD40L interaction is an early event in AD pathogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tan, J -- Town, T -- Paris, D -- Mori, T -- Suo, Z -- Crawford, F -- Mattson, M P -- Flavell, R A -- Mullan, M -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2352-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Roskamp Institute, University of South Florida, 3515 East Fletcher Avenue, Tampa, FL 33613, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600748" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/metabolism ; Amyloid beta-Peptides/*metabolism/pharmacology ; Animals ; Antigens, CD40/biosynthesis/*metabolism ; CD40 Ligand ; Cell Death ; Cells, Cultured ; Interferon-gamma/pharmacology ; Interleukins/pharmacology ; Ligands ; Membrane Glycoproteins/*metabolism/pharmacology ; Mice ; Mice, Transgenic ; Microglia/cytology/immunology/*metabolism ; Neurons/cytology ; Peptide Fragments/pharmacology ; Phosphorylation ; Signal Transduction ; Tumor Necrosis Factor-alpha/biosynthesis/pharmacology ; tau Proteins/metabolism
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  • 10
    Publication Date: 1999-05-13
    Description: Insulin elicits a spectrum of biological responses by binding to its cell surface receptor. In a screen for small molecules that activate the human insulin receptor tyrosine kinase, a nonpeptidyl fungal metabolite (L-783,281) was identified that acted as an insulin mimetic in several biochemical and cellular assays. The compound was selective for insulin receptor versus insulin-like growth factor I (IGFI) receptor and other receptor tyrosine kinases. Oral administration of L-783,281 to two mouse models of diabetes resulted in significant lowering in blood glucose levels. These results demonstrate the feasibility of discovering novel insulin receptor activators that may lead to new therapies for diabetes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, B -- Salituro, G -- Szalkowski, D -- Li, Z -- Zhang, Y -- Royo, I -- Vilella, D -- Diez, M T -- Pelaez, F -- Ruby, C -- Kendall, R L -- Mao, X -- Griffin, P -- Calaycay, J -- Zierath, J R -- Heck, J V -- Smith, R G -- Moller, D E -- New York, N.Y. -- Science. 1999 May 7;284(5416):974-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Endocrinology, Merck Research Laboratories, R80W250, Post Office Box 2000, Rahway, NJ 07065, USA. bei_zhang@merck.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10320380" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Animals ; Ascomycota/*metabolism ; Binding Sites ; Blood Glucose/metabolism ; CHO Cells ; Cricetinae ; Diabetes Mellitus, Type 2/*drug therapy ; Dose-Response Relationship, Drug ; Drug Evaluation, Preclinical ; Enzyme Activation ; Glucose Tolerance Test ; Hyperglycemia/drug therapy ; Hypoglycemic Agents/chemistry/metabolism/*pharmacology/therapeutic use ; Indoles/chemistry/metabolism/*pharmacology/therapeutic use ; Insulin/blood/metabolism/*pharmacology ; Insulin Receptor Substrate Proteins ; Mice ; Mice, Mutant Strains ; Mice, Obese ; Molecular Mimicry ; Phosphoproteins/metabolism ; Phosphorylation ; Protein Conformation/drug effects ; Receptor, Epidermal Growth Factor/metabolism ; Receptor, IGF Type 1/metabolism ; Receptor, Insulin/chemistry/*metabolism ; Signal Transduction
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