3lko
From Proteopedia
Crystal Structure of HLA B*3501 in complex with influenza NP418 epitope from 1934 strain
Structural highlights
Disease[B2MG_HUMAN] Defects in B2M are the cause of hypercatabolic hypoproteinemia (HYCATHYP) [MIM:241600]. Affected individuals show marked reduction in serum concentrations of immunoglobulin and albumin, probably due to rapid degradation.[1] 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.[2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] Function[1B35_HUMAN] Involved in the presentation of foreign antigens to the immune system. [B2MG_HUMAN] Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPreexisting T-cell immunity directed at conserved viral regions promotes enhanced recovery from influenza virus infections, with there being some evidence of cross-protection directed at variable peptides. Strikingly, many of the immunogenic peptides derived from the current pandemic A(H1N1)-2009 influenza virus are representative of the catastrophic 1918 "Spanish flu" rather than more recent "seasonal" strains. We present immunological and structural analyses of cross-reactive CD8(+) T-cell-mediated immunity directed at a variable (although highly cross-reactive) immunodominant NP(418-426) peptide that binds to a large B7 family (HLA-B*3501/03/0702) found throughout human populations. Memory CD8(+) T-cell specificity was probed for 12 different NP(418) mutants that emerged over the 9 decades between the 1918 and 2009 pandemics. Although there is evidence of substantial cross-reactivity among seasonal NP(418) mutants, current memory T-cell profiles show no preexisting immunity to the 2009-NP(418) variant or the 1918-NP(418) variant. Natural infection with the A(H1N1)-2009 virus, however, elicits CD8(+) T cells specific for the 2009-NP(418) and 1918-NP(418) epitopes. This analysis points to the potential importance of cross-reactive T-cell populations that cover the possible spectrum of T-cell variants and suggests that the identification of key residues/motifs that elicit cross-reactive T-cell sets could facilitate the evolution of immunization protocols that provide a measure of protection against unpredicted pandemic influenza viruses. Thus, it is worth exploring the potential of vaccines that incorporate peptide variants with a proven potential for broader immunogenicity, especially to those that are not recognized by the current memory T-cell pool generated by exposure to influenza variants that cause successive seasonal epidemics. Cross-reactive CD8+ T-cell immunity between the pandemic H1N1-2009 and H1N1-1918 influenza A viruses.,Gras S, Kedzierski L, Valkenburg SA, Laurie K, Liu YC, Denholm JT, Richards MJ, Rimmelzwaan GF, Kelso A, Doherty PC, Turner SJ, Rossjohn J, Kedzierska K Proc Natl Acad Sci U S A. 2010 Jul 13;107(28):12599-604. Epub 2010 Jun 28. PMID:20616031[15] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Human | Denholm, J | Doherty, P C | Gras, S | Kedzierska, K | Kedzierski, L | Liu, Y C | Richards, M | Rimmelzwaan, G F | Rossjohn, J | Turner, S J | Valkenburg, S A | Amyloid | Amyloidosis | Disease mutation | Disulfide bond | Glycation | Glycoprotein | Hla b*3501 | Host-virus interaction | Immune response | Immune system | Immunoglobulin domain | Influenza | Membrane | Mhc i | Np418 epitope | Pyrrolidone carboxylic acid | Secreted | Swine-flu | T cell immunity | Transmembrane
