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  • 1
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    HTLV-I trans-activator protein, tax, is a trans-repressor of the human beta-polymerase gene (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-03-02
    Description: Human T cell leukemia virus type I (HTLV-I) is the etiological agent for adult T cell leukemia (ATL). The HTLV-I trans-activator protein Tax can activate the expression of its own long terminal repeat (LTR) and many cellular and viral genes. Tax down-regulated the expression of human beta-polymerase (hu beta-pol), a cellular enzyme involved in host cell DNA repair. This finding suggests a possible correlation between HTLV-I infection and host chromosomal damage, which is often seen in ATL cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jeang, K T -- Widen, S G -- Semmes, O J 4th -- Wilson, S H -- New York, N.Y. -- Science. 1990 Mar 2;247(4946):1082-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2309119" target="_blank"〉PubMed〈/a〉
    Keywords: Base Sequence ; Cell Line ; Cell Line, Transformed ; DNA Polymerase I/*genetics ; DNA, Viral/genetics ; Gene Expression Regulation, Enzymologic ; Gene Expression Regulation, Viral ; Human T-lymphotropic virus 1/*genetics ; Humans ; Molecular Sequence Data ; Plasmids ; Promoter Regions, Genetic ; RNA, Messenger/biosynthesis ; Repetitive Sequences, Nucleic Acid ; Repressor Proteins/biosynthesis/*genetics ; Trans-Activators/biosynthesis/*genetics ; Transcription Factors/*genetics ; Transfection
    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 the DNA binding site for NGFI-B by genetic selection in yeast (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-31
    Description: An in vivo selection system for isolating targets of DNA binding proteins in yeast was developed and used to identify the DNA binding site for the NGFI-B protein, a member of the steroid-thyroid hormone receptor superfamily. The feasibility of the technique was verified by selecting DNA fragments that contained binding sites for GCN4, a well-characterized yeast transcriptional activator. The DNA binding domain of NGFI-B, expressed as part of a LexA-NGFI-B-GAL4 chimeric activator, was then used to isolate a rat genomic DNA fragment that contained an NGFI-B binding site. The NGFI-B response element (NBRE) is similar to but functionally distinct from elements recognized by the estrogen and thyroid hormone receptors and the hormone receptor-like proteins COUP-TF, CF1, and H-2RIIBP. Cotransfection experiments in mammalian cells demonstrated that NGFI-B can activate transcription from the NBRE with or without its putative ligand binding domain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, T E -- Fahrner, T J -- Johnston, M -- Milbrandt, J -- NS01018/NS/NINDS NIH HHS/ -- P01 CA49712/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 May 31;252(5010):1296-300.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925541" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins/metabolism ; Base Sequence ; Binding Sites ; Cloning, Molecular ; DNA, Fungal/*metabolism ; DNA-Binding Proteins/genetics/*metabolism/pharmacology ; Fungal Proteins/metabolism ; Molecular Sequence Data ; Nuclear Receptor Subfamily 4, Group A, Member 1 ; Plasmids ; *Protein Kinases ; Rats ; Receptors, Cytoplasmic and Nuclear ; Receptors, Steroid ; Repressor Proteins ; Saccharomyces cerevisiae/*genetics ; *Saccharomyces cerevisiae Proteins ; *Serine Endopeptidases ; Transcription Factors/genetics/*metabolism/pharmacology ; Transcription, Genetic ; Transfection
    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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    Human immunodeficiency virus infection of human-PBL-SCID mice (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-02-15
    Description: Severe combined immunodeficient (SCID) mice reconstituted with human peripheral blood leukocytes (hu-PBL-SCID mice) have inducible human immune function and may be useful as a small animal model for acquired immunodeficiency syndrome (AIDS) research. Hu-PBL-SCID mice infected with human immunodeficiency virus-1 (HIV-1) contained virus that was recoverable by culture from the peritoneal cavity, spleen, peripheral blood, and lymph nodes for up to 16 weeks after infection; viral sequences were also detected by in situ hybridization and by amplification with the polymerase chain reaction (PCR). Mice could be infected with multiple strains of HIV-1, including LAV-1/Bru, IIIB, MN, SF2, and SF13. HIV-1 infection affected the concentration of human immunoglobulin and the number of CD4+ T cells in the mice. These results support the use of the hu-PBL-SCID mouse for studies of the pathogenesis and treatment of AIDS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mosier, D E -- Gulizia, R J -- Baird, S M -- Wilson, D B -- Spector, D H -- Spector, S A -- AI-27703/AI/NIAID NIH HHS/ -- AI-29182/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1991 Feb 15;251(4995):791-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Immunology, Medical Biology Institute, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1990441" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood Transfusion ; Chimera/*immunology ; *Disease Models, Animal ; *HIV Infections/immunology ; *HIV-1/isolation & purification ; Humans ; Immunologic Deficiency Syndromes/genetics/*immunology ; Lymphocyte Transfusion ; Mice ; Mice, Mutant Strains/*immunology ; Spleen/microbiology
    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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    Correction of CD18-deficient lymphocytes by retrovirus-mediated gene transfer (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-15
    Description: Leukocyte adhesion deficiency (LAD) is an inherited disorder of leukocyte function caused by derangements in CD18 expression. The genetic and functional abnormalities in a lymphocyte cell line from a patient with LAD have been corrected by retrovirus-mediated transduction of a functional CD18 gene. Lymphocytes from patients with LAD were exposed to CD18-expressing retrovirus and enriched for cells that express CD11a and CD18 (LFA-1) on the cell surface. Molecular and functional analyses of these cells revealed (i) one copy of proviral sequence per cell, (ii) viral-directed CD18 RNA that exceeded normal endogenous levels, (iii) normal quantities of CD11a and CD18 protein on the cell surface, and (iv) reconstitution of LFA-1-dependent adhesive function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, J M -- Ping, A J -- Krauss, J C -- Mayo-Bond, L -- Rogers, C E -- Anderson, D C -- Todd, R F -- R01 AI19031/AI/NIAID NIH HHS/ -- R01 AI23521/AI/NIAID NIH HHS/ -- R01 CA39064/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1990 Jun 15;248(4961):1413-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Internal Medicine, Ann Arbor, MI.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1972597" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD ; Antigens, CD18 ; Antigens, Differentiation/genetics/immunology ; Cell Aggregation ; Cell Line ; Cell Line, Transformed ; Gene Expression ; Genetic Therapy ; Genetic Vectors ; Herpesvirus 4, Human ; Humans ; *Leukocyte-Adhesion Deficiency Syndrome ; Lymphocyte Function-Associated Antigen-1 ; Lymphocytes/immunology ; Membrane Glycoproteins ; Mice ; Nucleic Acid Hybridization ; Receptors, Leukocyte-Adhesion/genetics/immunology ; Retroviridae/*genetics ; Tetradecanoylphorbol Acetate/pharmacology ; *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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  • 5
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    Crystal structures of an antibody to a peptide and its complex with peptide antigen at 2.8 A (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-11
    Description: The three-dimensional structures of an antibody to a peptide and its complex with the peptide antigen have been determined at 2.8 A resolution. The antigen is a synthetic 19-amino acid peptide homolog of the C helix of myohemerythrin (Mhr). The unliganded Fab' crystals are orthorhombic with two molecules per asymmetric unit, whereas the complex crystals are hexagonal with one molecule per asymmetric unit. The Fab' and the Fab'-peptide complex structures have been solved independently by molecular replacement methods and have crystallographic R factors of 0.197 and 0.215, respectively, with no water molecules included. The amino-terminal portion of the peptide sequence (NH2-Glu-Val-Val-Pro-His-Lys-Lys) is clearly interpretable in the electron density map of the Fab'-peptide complex and adopts a well-defined type II beta-turn in the concave antigen binding pocket. This same peptide amino acid sequence in native Mhr is alpha-helical. The peptide conformation when bound to the Fab' is inconsistent with binding of the Fab' to native Mhr, and suggests that binding of the Fab' to conformationally altered forms of the native Mhr or to apo-Mhr. Immunological mapping previously identified this sequence as the peptide epitope, and its fine specificity correlates well with the structural analysis. The binding pocket includes a large percentage of hydrophobic residues. The buried surfaces of the peptide and the antibody are complementary in shape and cover 460 A2 and 540 A2, respectively. These two structures now enable a comparison of a specific monoclonal Fab' both in its free and antigen complexed state. While no major changes in the antibody were observed when peptide was bound, there were some small but significant side chain and main chain rearrangements.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stanfield, R L -- Fieser, T M -- Lerner, R A -- Wilson, I A -- AI-07244/AI/NIAID NIH HHS/ -- GM38794/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1990 May 11;248(4956):712-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Research Institute of Scripps Clinic, La Jolla, California 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2333521" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Antigen-Antibody Complex ; Crystallization ; *Hemerythrin/analogs & derivatives/immunology ; *Immunoglobulin Fab Fragments ; *Metalloproteins/immunology ; *Models, Molecular ; Molecular Sequence Data ; Peptides/*immunology ; Pigments, Biological ; Protein Conformation ; Software ; X-Ray Diffraction
    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
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    Three-dimensional structure of the LDL receptor-binding domain of human apolipoprotein E (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-06-28
    Description: Human apolipoprotein E, a blood plasma protein, mediates the transport and uptake of cholesterol and lipid by way of its high affinity interaction with different cellular receptors, including the low-density lipoprotein (LDL) receptor. The three-dimensional structure of the LDL receptor-binding domain of apoE has been determined at 2.5 angstrom resolution by x-ray crystallography. The protein forms an unusually elongated (65 angstroms) four-helix bundle, with the helices apparently stabilized by a tightly packed hydrophobic core that includes leucine zipper-type interactions and by numerous salt bridges on the mostly charged surface. Basic amino acids important for LDL receptor binding are clustered into a surface patch on one long helix. This structure provides the basis for understanding the behavior of naturally occurring mutants that can lead to atherosclerosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, C -- Wardell, M R -- Weisgraber, K H -- Mahley, R W -- Agard, D A -- HL-41633/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1991 Jun 28;252(5014):1817-22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of California, San Francisco 94143-0448.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2063194" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Apolipoproteins E/*chemistry/genetics/metabolism ; Binding Sites ; Computer Graphics ; Humans ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; Receptors, LDL/*metabolism ; X-Ray Diffraction
    Print ISSN: 0036-8075
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  • 7
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    Atomic structure of adenosine deaminase complexed with a transition-state analog: understanding catalysis and immunodeficiency mutations (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-05-31
    Description: The crystal structure of a murine adenosine deaminase complexed with 6-hydroxyl-1,6-dihydropurine ribonucleoside, a nearly ideal transition-state analog, has been determined and refined at 2.4 angstrom resolution. The structure is folded as an eight-stranded parallel alpha/beta barrel with a deep pocket at the beta-barrel COOH-terminal end wherein the inhibitor and a zinc are bound and completely sequestered. The presence of the zinc cofactor and the precise structure of the bound analog were not previously known. The 6R isomer of the analog is very tightly held in place by the coordination of the 6-hydroxyl to the zinc and the formation of nine hydrogen bonds. On the basis of the structure of the complex a stereoselective addition-elimination or SN2 mechanism of the enzyme is proposed with the zinc atom and the Glu and Asp residues playing key roles. A molecular explanation of a hereditary disease caused by several point mutations of an enzyme is also presented.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, D K -- Rudolph, F B -- Quiocho, F A -- CA14030/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1991 May 31;252(5010):1278-84.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1925539" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Deaminase/*chemistry/deficiency/metabolism ; Amino Acid Sequence ; Animals ; Binding Sites ; Catalysis ; Crystallization ; Immunologic Deficiency Syndromes/*enzymology/genetics ; Mice ; Models, Molecular ; Molecular Structure ; Mutation ; Protein Conformation ; Purine Nucleosides/chemistry/*metabolism ; Ribonucleosides/chemistry/*metabolism ; Zinc/metabolism
    Print ISSN: 0036-8075
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  • 8
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    An unlikely sugar substrate site in the 1.65 A structure of the human aldose reductase holoenzyme implicated in diabetic complications (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-07-03
    Description: Aldose reductase, which catalyzes the reduced form of nicotinamide adenine dinucleotide phosphate (NADPH)-dependent reduction of a wide variety of aromatic and aliphatic carbonyl compounds, is implicated in the development of diabetic and galactosemic complications involving the lens, retina, nerves, and kidney. A 1.65 angstrom refined structure of a recombinant human placenta aldose reductase reveals that the enzyme contains a parallel beta 8/alpha 8-barrel motif and establishes a new motif for NADP-binding oxidoreductases. The substrate-binding site is located in a large, deep elliptical pocket at the COOH-terminal end of the beta barrel with a bound NADPH in an extended conformation. The highly hydrophobic nature of the active site pocket greatly favors aromatic and apolar substrates over highly polar monosaccharides. The structure should allow for the rational design of specific inhibitors that might provide molecular understanding of the catalytic mechanism, as well as possible therapeutic agents.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, D K -- Bohren, K M -- Gabbay, K H -- Quiocho, F A -- DK-39,044/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1992 Jul 3;257(5066):81-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1621098" target="_blank"〉PubMed〈/a〉
    Keywords: Aldehyde Reductase/*chemistry/metabolism ; Amino Acid Sequence ; Binding Sites ; *Diabetes Complications ; Diabetes Mellitus/*enzymology ; Humans ; Models, Molecular ; Molecular Sequence Data ; Protein Conformation ; X-Ray Diffraction/methods
    Print ISSN: 0036-8075
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  • 9
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    Participation of non-zinc finger residues in DNA binding by two nuclear orphan receptors (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-04-03
    Description: Steroid-thyroid hormone receptors typically bind as dimers to DNA sequences that contain repeated elements termed half-sites. NGFI-B, an early response protein and orphan member of this receptor superfamily, binds to a DNA sequence that contains only one half-site (5'-AAAGGTCA-3'). A domain separate from the NGFI-B zinc fingers, termed the A box, was identified and is required for recognition of the two adenine-thymidine (A-T) base pairs at the 5' end of the NGFI-B DNA binding element. In addition, a domain downstream of the zinc fingers of the orphan receptor H-2 region II binding protein, termed the T box, determined binding to tandem repeats of the estrogen receptor half-site (5'-AGGTCA-3').〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, T E -- Paulsen, R E -- Padgett, K A -- Milbrandt, J -- NS01018/NS/NINDS NIH HHS/ -- P01 CA49712/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Apr 3;256(5053):107-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1314418" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Binding Sites ; CHO Cells ; Cell Nucleus/*physiology ; Cricetinae ; DNA/*metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Kinetics ; Mice ; Molecular Sequence Data ; Nuclear Receptor Subfamily 4, Group A, Member 1 ; Oligodeoxyribonucleotides/metabolism ; Polymerase Chain Reaction ; Receptors, Cell Surface/*metabolism ; Receptors, Cytoplasmic and Nuclear ; Receptors, Steroid ; Recombinant Fusion Proteins/metabolism ; Sequence Homology, Nucleic Acid ; Substrate Specificity ; Transcription Factors/genetics/*metabolism ; Transfection ; Zinc Fingers/genetics
    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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  • 10
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    Emerging principles for the recognition of peptide antigens by MHC class I molecules (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1992-08-14
    Description: Class I major histocompatibility complex (MHC) molecules interact with self and foreign peptides of diverse amino acid sequences yet exhibit distinct allele-specific selectivity for peptide binding. The structures of the peptide-binding specificity pockets (subsites) in the groove of murine H-2Kb as well as human histocompatibility antigen class I molecules have been analyzed. Deep but highly conserved pockets at each end of the groove bind the amino and carboxyl termini of peptide through extensive hydrogen bonding and, hence, dictate the orientation of peptide binding. A deep polymorphic pocket in the middle of the groove provides the chemical and structural complementarity for one of the peptide's anchor residues, thereby playing a major role in allele-specific peptide binding. Although one or two shallow pockets in the groove may also interact with specific peptide side chains, their role in the selection of peptide is minor. Thus, usage of a limited number of both deep and shallow pockets in multiple combinations appears to allow the binding of a broad range of peptides. This binding occurs with high affinity, primarily because of extensive interactions with the peptide backbone and the conserved hydrogen bonding network at both termini of the peptide. Interactions between the anchor residue (or residues) and the corresponding allele-specific pocket provide sufficient extra binding affinity not only to enhance specificity but also to endure the presentation of the peptide at the cell surface for recognition by T cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Matsumura, M -- Fremont, D H -- Peterson, P A -- Wilson, I A -- CA-09523/CA/NCI NIH HHS/ -- CA-97489/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Aug 14;257(5072):927-34.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Scripps Research Institute, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1323878" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens/chemistry/*metabolism ; Binding Sites ; H-2 Antigens/chemistry/*metabolism ; HLA-A2 Antigen/chemistry ; Histocompatibility Antigens Class I/chemistry/*metabolism ; Hydrogen Bonding ; Mice ; Models, Molecular ; Molecular Sequence Data ; Ovalbumin/chemistry/metabolism ; Peptide Fragments/chemistry/metabolism ; Peptides/chemistry/*metabolism ; Protein Conformation ; Solvents ; Vesicular stomatitis Indiana virus/metabolism ; Viral Proteins/chemistry/*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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