Linked Life Data

7969188

Source:http://linkedlifedata.com/resource/pubmed/id/7969188

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pubmed-article:7969188pubmed:abstractTextThe adenovirus early region 3 glycoprotein E3-19k binds to and inhibits expression of class I major histocompatibility complex (MHC)-encoded molecules, which may help infected cells evade immune recognition. The role of specific regions of the class I MHC molecule in the interaction with E3-19k was evaluated using a series of HLA-A2.1-, HLA-A2 variant-, and HLA-B7-expressing cell lines. The monoclonal antibody (mAb) W6/32, which recognizes a monomorphic epitope on class I MHC molecules, readily co-immunoprecipitated E3-19k with HLA-A2.1 and 14 different HLA-A2 variant molecules that differ from HLA-A2.1 by single amino acid substitutions. Thus, no single residue tested in the regions of the class I MHC molecule that bind peptide or the T-cell receptor controls the binding to E3-19k. Additional immunoprecipitations performed with mAbs directed against well-defined epitopes on the surface of HLA-A2.1 revealed a dichotomy in the ability of the mAbs to co-immunoprecipitate HLA-A2.1 and E3-19k. The mAbs LGIII-220 (directed against the C-terminal end of the alpha 1-helix), CR11-351 (directed against the N-terminal end of the alpha 2-helix), and PA2.1 (directed against the middle of the alpha 2-helix and an underlying beta-loop) readily co-precipitated HLA-A2.1 and E3-19k. In contrast, mAbs MA2.1 (directed against the N-terminal end of the alpha 1-helix and the C-terminal end of the alpha 2-helix) and HO-2 (directed against the N-terminal end of the alpha 1-helix) did not co-precipitate E3-19k with HLA-A2.1. Similarly, mAb MB40.2 (directed against residues 169-182 of HLA-B7) also did not co-precipitate E3-19k with HLA-B7. These studies lead to the conclusion that the N-terminal end of the alpha 1-helix and the C-terminal end of the alpha 2-helix play an important role in dictating the ability of the E3-19k protein to bind to the class I MHC molecule.lld:pubmed
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pubmed-article:7969188pubmed:pagination1277-84lld:pubmed
pubmed-article:7969188pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:7969188pubmed:year1994lld:pubmed
pubmed-article:7969188pubmed:articleTitleIdentification of class I MHC regions which bind to the adenovirus E3-19k protein.lld:pubmed
pubmed-article:7969188pubmed:affiliationDepartment of Medicine, Medical College of Wisconsin, Milwaukee.lld:pubmed
pubmed-article:7969188pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7969188pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:7969188pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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