5D7I image
Entry Detail
PDB ID:
5D7I
Keywords:
Title:
Structure of human MR1-Ac-6-FP in complex with human MAIT M33.64 TCR
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2015-08-14
Release Date:
2016-01-27
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.22
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Major histocompatibility complex class I-related gene protein
Chain IDs:A, C
Chain Length:271
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B, D
Chain Length:100
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:M33.64 TCR Alpha Chain
Chain IDs:E (auth: G), G (auth: E)
Chain Length:204
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:M33.64 TCR Beta Chain
Chain IDs:F (auth: H), H (auth: F)
Chain Length:245
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Diversity of T Cells Restricted by the MHC Class I-Related Molecule MR1 Facilitates Differential Antigen Recognition.
Immunity 44 32 45 (2016)
PMID: 26795251 DOI: 10.1016/j.immuni.2015.12.005

Abstact

A characteristic of mucosal-associated invariant T (MAIT) cells is the expression of TRAV1-2(+) T cell receptors (TCRs) that are activated by riboflavin metabolite-based antigens (Ag) presented by the MHC-I related molecule, MR1. Whether the MR1-restricted T cell repertoire and associated Ag responsiveness extends beyond these cells remains unclear. Here, we describe MR1 autoreactivity and folate-derivative reactivity in a discrete subset of TRAV1-2(+) MAIT cells. This recognition was attributable to CDR3β loop-mediated effects within a consensus TRAV1-2(+) TCR-MR1-Ag footprint. Furthermore, we have demonstrated differential folate- and riboflavin-derivative reactivity by a diverse population of "atypical" TRAV1-2(-) MR1-restricted T cells. We have shown that TRAV1-2(-) T cells are phenotypically heterogeneous and largely distinct from TRAV1-2(+) MAIT cells. A TRAV1-2(-) TCR docks more centrally on MR1, thereby adopting a markedly different molecular footprint to the TRAV1-2(+) TCR. Accordingly, diversity within the MR1-restricted T cell repertoire leads to differing MR1-restricted Ag specificity.

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