1ao7
From Proteopedia
COMPLEX BETWEEN HUMAN T-CELL RECEPTOR, VIRAL PEPTIDE (TAX), AND HLA-A 0201
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[1A02_HUMAN] Involved in the presentation of foreign antigens to the immune system. [TAX_HTL1C] Transcriptional activator that activates both the viral long terminal repeat (LTR) and cellular promoters via activation of CREB, NF-kappa-B, SRF and AP-1 pathways. Binds to three 21 bp repeat elements located within the LTRs, referred to as Tax-responsive elements (TRE). Binding to TRE requires the interaction with CREB1 and CREBBP. Also induces chromatin remodeling of proviral LTR-mediated gene expression by recruiting the histone acetyl transferases CREBBP and EP300 to the chromatin, which results in histone acetylation. Via its interaction with IKK regulatory subunit IKBKG, Tax-1 persistently stimulates I-kappa-B kinase (IKK), resulting in constitutive activation of the transcription factor NF-kappa-B. Induction of the nuclear expression of members of the NFkB family of transcription factors, which leads to up-regulated expression of many gene promoters containing NFkB motifs. These genes include those encoding IL2, IL15, IL2RA and IL15RA, leading to autocrine IL2/IL2RA and IL15/IL15RA loops. The resulting T-cell proliferation leads to malignant transformation and to the development of adult T-cell leukemia (ATL). IL13, known to be linked to leukemogenesis, is also up-regulated by Tax-1. Interaction with PDZ domain-containing proteins induce IL2-independent growth, which may be a factor in multi-step leukemogenesis. Inhibits the action of at least three cellular tumor suppressors p53/TP53, RB1 and DLG1, and suppresses their abilities to dictate apoptosis in primary cells. Required for viral replication (By similarity). [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 PubMedRecognition by a T-cell antigen receptor (TCR) of peptide complexed with a major histocompatibility complex (MHC) molecule occurs through variable loops in the TCR structure which bury almost all the available peptide and a much larger area of the MHC molecule. The TCR fits diagonally across the MHC peptide-binding site in a surface feature common to all class I and class II MHC molecules, providing evidence that the nature of binding is general. A broadly applicable binding mode has implications for the mechanism of repertoire selection and the magnitude of alloreactions. Structure of the complex between human T-cell receptor, viral peptide and HLA-A2.,Garboczi DN, Ghosh P, Utz U, Fan QR, Biddison WE, Wiley DC Nature. 1996 Nov 14;384(6605):134-41. PMID:8906788[15] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Htlv-1 | Human | Large Structures | Biddison, W E | Fan, Q R | Garboczi, D N | Ghosh, P | Utz, U | Wiley, D C | Class i mhc | T-cell receptor | Viral peptide
