4nt6

<StructureSection load='4nt6' size='340' side='right'caption='[[4nt6]], [[Resolution|resolution]] 1.84&Aring;' scene=''>

<table><tr><td colspan='2'>[[4nt6]] is a 3 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NT6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4NT6 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[4nt7|4nt7]]</div></td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4nt6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nt6 OCA], [https://pdbe.org/4nt6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4nt6 RCSB], [https://www.ebi.ac.uk/pdbsum/4nt6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4nt6 ProSAT]</span></td></tr>

== Disease ==

[[https://www.uniprot.org/uniprot/B2MG_HUMAN B2MG_HUMAN]] Defects in B2M are the cause of hypercatabolic hypoproteinemia (HYCATHYP) [MIM:[https://omim.org/entry/241600 241600]]. Affected individuals show marked reduction in serum concentrations of immunoglobulin and albumin, probably due to rapid degradation.<ref>PMID:16549777</ref> Note=Beta-2-microglobulin may adopt the fibrillar configuration of amyloid in certain pathologic states. The capacity to assemble into amyloid fibrils is concentration dependent. Persistently high beta(2)-microglobulin serum levels lead to amyloidosis in patients on long-term hemodialysis.<ref>PMID:3532124</ref> <ref>PMID:1336137</ref> <ref>PMID:7554280</ref> <ref>PMID:4586824</ref> <ref>PMID:8084451</ref> <ref>PMID:12119416</ref> <ref>PMID:12796775</ref> <ref>PMID:16901902</ref> <ref>PMID:16491088</ref> <ref>PMID:17646174</ref> <ref>PMID:18835253</ref> <ref>PMID:18395224</ref> <ref>PMID:19284997</ref>

== Function ==

[[https://www.uniprot.org/uniprot/1C08_HUMAN 1C08_HUMAN]] Involved in the presentation of foreign antigens to the immune system. [[https://www.uniprot.org/uniprot/B2MG_HUMAN B2MG_HUMAN]] Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system.

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== Publication Abstract from PubMed ==

Cytotoxic T lymphocytes recognizing conserved peptide epitopes are crucial in the protection against influenza A virus (IAV) infection. The CD8 T cell response against the M158-66 (GILGFVFTL) matrix protein epitope is immunodominant when restricted by HLA-A*02, a major histocompatibility complex (MHC) expressed by approximately half of the human population. Herein, we report that the GILGFVFTL peptide is restricted by multiple HLA-C*08 alleles as well. We observed that M158-66 was able to elicit CTL responses in both HLA-A*02 and -C*08 positive individuals; and that GILGFVFTL-specific CTLs in individuals expressing both restriction elements were distinct and not cross-reactive. The crystal structure of GILGFVFTL/HLA-C*08:01 was solved at 1.84A and comparison with the known GILGFVFTL/HLA-A*02:01 structure revealed that the antigen bound both complexes in near-identical conformation, accommodated by binding pockets shaped from shared as well as unique residues. This discovery of degenerate peptide presentation by both HLA-A and HLA-C allelic variants eliciting unique CTL responses to IAV infection contributes fundamental knowledge with important implications for vaccine development strategies. IMPORTANCE: The presentation of influenza A virus peptide to elicit immunity is thought to be narrowly restricted, with a single peptide presented by a specific HLA molecule. In this study, we show that the same influenza A peptide can be more broadly presented by both HLA-A and HLA-C molecules. This discovery may help to explain the differences in immunity to influenza A between individuals and populations, and also aid in the design of vaccines.

The immunodominant Influenza A virus M158-66 CTL epitope exhibits degenerate class I MHC restriction in humans.,Choo JA, Liu J, Toh X, Grotenbreg GM, Ren EC J Virol. 2014 Jul 2. pii: JVI.00855-14. PMID:24990997<ref>PMID:24990997</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 4nt6" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Liu, J X]]

[[Category: Ren, E C]]

[[Category: Toh, X Y]]

[[Category: Immune system]]