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  • 1
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    TCR-Mediated internalization of peptide-MHC complexes acquired by T cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-05
    Description: Peptide-major histocompatibility complex protein complexes (pMHCs) on antigen-presenting cells (APCs) are central to T cell activation. Within minutes of peptide-specific T cells interacting with APCs, pMHCs on APCs formed clusters at the site of T cell contact. Thereafter, these clusters were acquired by T cells and internalized through T cell receptor-mediated endocytosis. During this process, T cells became sensitive to peptide-specific lysis by neighboring T cells (fratricide). This form of immunoregulation could explain the "exhaustion" of T cell responses that is induced by high viral loads and may serve to down-regulate immune responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huang, J F -- Yang, Y -- Sepulveda, H -- Shi, W -- Hwang, I -- Peterson, P A -- Jackson, M R -- Sprent, J -- Cai, Z -- New York, N.Y. -- Science. 1999 Oct 29;286(5441):952-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉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/10542149" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Drosophila ; *Endocytosis ; Flow Cytometry ; Histocompatibility Antigens/*immunology ; Macromolecular Substances ; Peptides/*immunology ; Receptors, Antigen, T-Cell/*immunology ; Recombinant Fusion Proteins/genetics/immunology ; T-Lymphocytes/*immunology/metabolism ; T-Lymphocytes, Cytotoxic/immunology
    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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    Peptide binding and presentation by mouse CD1 (1995)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1995-07-14
    Description: CD1 molecules are distantly related to the major histocompatibility complex (MHC) class I proteins. They are of unknown function. Screening random peptide phage display libraries with soluble empty mouse CD1 (mCD1) identified a peptide binding motif. It consists of three anchor positions occupied by aromatic or bulky hydrophobic amino acids. Equilibrium binding studies demonstrated that mCD1 binds peptides containing the appropriate motif with relatively high affinity. However, in contrast to classical MHC class I molecules, strong binding to mCD1 required relatively long peptides. Peptide-specific, mCD1-restricted T cell responses can be raised, which suggests that the findings are of immunological significance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Castano, A R -- Tangri, S -- Miller, J E -- Holcombe, H R -- Jackson, M R -- Huse, W D -- Kronenberg, M -- Peterson, P A -- New York, N.Y. -- Science. 1995 Jul 14;269(5221):223-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7542403" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Antigen Presentation ; Antigens, CD/chemistry/*immunology/metabolism ; Antigens, CD1 ; Cell Line ; Mice ; Mice, Inbred C57BL ; Molecular Sequence Data ; Peptides/chemistry/*immunology/metabolism ; T-Lymphocytes, Cytotoxic/*immunology ; 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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    An alphabeta T cell receptor structure at 2.5 A and its orientation in the TCR-MHC complex (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-10-11
    Description: The central event in the cellular immune response to invading microorganisms is the specific recognition of foreign peptides bound to major histocompatibility complex (MHC) molecules by the alphabeta T cell receptor (TCR). The x-ray structure of the complete extracellular fragment of a glycosylated alphabeta TCR was determined at 2.5 angstroms, and its orientation bound to a class I MHC-peptide (pMHC) complex was elucidated from crystals of the TCR-pMHC complex. The TCR resembles an antibody in the variable Valpha and Vbeta domains but deviates in the constant Calpha domain and in the interdomain pairing of Calpha with Cbeta. Four of seven possible asparagine-linked glycosylation sites have ordered carbohydrate moieties, one of which lies in the Calpha-Cbeta interface. The TCR combining site is relatively flat except for a deep hydrophobic cavity between the hypervariable CDR3s (complementarity-determining regions) of the alpha and beta chains. The 2C TCR covers the class I MHC H-2Kb binding groove so that the Valpha CDRs 1 and 2 are positioned over the amino-terminal region of the bound dEV8 peptide, the Vbeta chain CDRs 1 and 2 are over the carboxyl-terminal region of the peptide, and the Valpha and Vbeta CDR3s straddle the peptide between the helices around the central position of the peptide.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garcia, K C -- Degano, M -- Stanfield, R L -- Brunmark, A -- Jackson, M R -- Peterson, P A -- Teyton, L -- Wilson, I A -- R01 CA58896/CA/NCI NIH HHS/ -- T32-A107244/PHS HHS/ -- New York, N.Y. -- Science. 1996 Oct 11;274(5285):209-19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and the Skaggs Institute of Chemical Biology, Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8824178" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Carbohydrate Sequence ; Cells, Cultured ; Crystallization ; Crystallography, X-Ray ; Drosophila melanogaster ; Glycosylation ; H-2 Antigens/*chemistry/immunology/metabolism ; Hydrogen Bonding ; Major Histocompatibility Complex ; Mice ; Models, Molecular ; Molecular Sequence Data ; Peptides/*chemistry/immunology/metabolism ; *Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Receptors, Antigen, T-Cell, alpha-beta/*chemistry/immunology/metabolism ; Recombinant Proteins ; T-Lymphocytes, Cytotoxic/*immunology
    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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    Regulation of MHC class I transport by the molecular chaperone, calnexin (p88, IP90) (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-01-21
    Description: Assembled class I histocompatibility molecules, consisting of heavy chain, beta 2-microglobulin, and peptide ligand, are transported rapidly to the cell surface. In contrast, the intracellular transport of free heavy chains or peptide-deficient heavy chain-beta 2-microglobulin heterodimers is impaired. A 90-kilodalton membrane-bound chaperone of the endoplasmic reticulum (ER), termed calnexin, associates quantitatively with newly synthesized class I heavy chains, but the functions of calnexin in this interaction are unknown. Class I subunits were expressed alone or in combination with calnexin in Drosophila melanogaster cells. Calnexin retarded the intracellular transport of both peptide-deficient heavy chain-beta 2-microglobulin heterodimers and free heavy chains. Calnexin also impeded the rapid intracellular degradation of free heavy chains. The ability of calnexin to protect and retain class I assembly intermediates is likely to contribute to the efficient intracellular formation of class I-peptide complexes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jackson, M R -- Cohen-Doyle, M F -- Peterson, P A -- Williams, D B -- New York, N.Y. -- Science. 1994 Jan 21;263(5145):384-7.〈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/8278813" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Biological Transport ; Calcium-Binding Proteins/*metabolism ; Calnexin ; Cell Line ; Drosophila melanogaster ; Endoplasmic Reticulum/*metabolism ; Golgi Apparatus/metabolism ; Histocompatibility Antigens Class I/*metabolism ; Membrane Proteins/*metabolism ; Molecular Sequence Data ; Temperature ; Transfection ; beta 2-Microglobulin/*metabolism
    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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  • 5
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    Oceanic lavas sampling the high-3He/4He mantle reservoir: Primitive, depleted, or re-enriched? (2015)
    Mineralogical Society of America
    Details
    Publication Date: 2015-10-02
    Description: Helium isotopes are used as a tracer for primitive reservoirs that have persisted in the Earth’s mantle. Basalts erupted at several intraplate oceanic islands, including Hawaii, Iceland, Galapagos, and Samoa, have hosted the highest 3 He/ 4 He ratios (〉30 Ra, where Ra is atmospheric 3 He/ 4 He ratio) globally that are far in excess of the 3 He/ 4 He typical of the upper mantle sampled at mid-ocean ridges (8 Ra). These lavas have been suggested to be melts of a primitive, or possibly slightly depleted, mantle reservoir, i.e., either fertile or a depleted peridotite. Here we report evidence for geochemical enrichment in the high- 3 He/ 4 He mantle sampled by lavas with the highest 3 He/ 4 He from Hawaii, Samoa, and possibly Galapagos. The titanium concentrations in high- 3 He/ 4 He lavas from Samoa are too high to be explained by melts of a mantle peridotite, even at infinitesimally small degrees of melting, and the elevated Ti corresponds to elevated Pb-isotopic ratios. The highest 3 He/ 4 He lavas from Loihi, Hawaii, also have Ti concentrations that are too high to be melts of primitive mantle peridotite at the degrees of melt extraction proposed for this ocean island. Thus, Ti-rich material must have been added to the high- 3 He/ 4 He mantle reservoir, and this material is likely to be recycled mafic crust similar to MORB-like eclogite, which is consistent with the elevated Pb-isotopic ratios. We show that fractionation corrected, major element compositions of high- 3 He/ 4 He alkalic lavas can be satisfactorily modeled by melting and melt-rock interaction scenario in a fertile peridotite-MORB-eclogite hybrid system. Primitive peridotitic and recycled eclogitic reservoirs are suggested to be intimately associated in the deepest mantle and high- 3 He/ 4 He lavas from several localities may sample a mantle source that hosts a component of recycled oceanic crust.
    Print ISSN: 0003-004X
    Electronic ISSN: 1945-3027
    Topics: Geosciences
    Published by Mineralogical Society of America
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