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1hxm

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[[Image:1hxm.gif|left|200px]]
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{{STRUCTURE_1hxm| PDB=1hxm | SCENE= }}
{{STRUCTURE_1hxm| PDB=1hxm | SCENE= }}
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'''Crystal Structure of a Human Vgamma9/Vdelta2 T Cell Receptor'''
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===Crystal Structure of a Human Vgamma9/Vdelta2 T Cell Receptor===
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==Overview==
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T-cell antigen receptors composed of gamma and delta polypeptide chains (gammadelta TCRs) can directly recognize antigens in the form of intact proteins or non-peptide compounds, unlike alphabeta TCRs, which recognize antigens bound to major histocompatibility complex molecules (MHC). About 5% of peripheral blood T cells bear gammadelta TCRs, most of which recognize non-peptide phosphorylated antigens. Here we describe the 3.1 A resolution structure of a human gammadelta TCR from a T-cell clone that is phosphoantigen-reactive. The orientation of the variable (V) and constant (C) regions of the gammadelta TCR is unique when compared with alphabeta TCRs or antibodies, and results from an unusually small angle between the Vgamma and Cgamma domains. The complementarity-determining regions (CDRs) of the V domains exhibit a chemically reasonable binding site for phosphorylated antigens, providing a possible explanation for the canonical usage of the Vgamma9 and Vdelta2 gene segments by phosphoantigen-reactive receptors. Although the gammadelta TCR V domains are similar in overall structure to those of alphabeta TCRs, gammadelta TCR C domains are markedly different. Structural differences in Cgamma and Cdelta, and in the location of the disulphide bond between them, may enable gammadelta TCRs to form different recognition/signalling complexes than alphabeta TCRs.
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(as it appears on PubMed at http://www.pubmed.gov), where 11459064 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11459064}}
==About this Structure==
==About this Structure==
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[[Category: T cell receptor]]
[[Category: T cell receptor]]
[[Category: Tcr]]
[[Category: Tcr]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:20:10 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:05:16 2008''

Revision as of 07:05, 1 July 2008

Image:1hxm.png

Template:STRUCTURE 1hxm

Crystal Structure of a Human Vgamma9/Vdelta2 T Cell Receptor

Template:ABSTRACT PUBMED 11459064

About this Structure

1HXM is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of a human gammadelta T-cell antigen receptor., Allison TJ, Winter CC, Fournie JJ, Bonneville M, Garboczi DN, Nature. 2001 Jun 14;411(6839):820-4. PMID:11459064

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