TY - JOUR
T1 - Atypical TRAV1-22 T cell receptor recognition of the antigen-presenting molecule MR1
AU - Awad, Wael
AU - Meermeier, Erin W.
AU - Sandoval-Romero, Maria L.
AU - Le Nours, Jérôme
AU - Worley, Aneta H.
AU - Null, Megan D.
AU - Liu, Ligong
AU - McCluskey, James
AU - Fairlie, David P.
AU - Lewinsohn, David M.
AU - Rossjohn, Jamie
N1 - Publisher Copyright:
© 2020 American Society for Biochemistry and Molecular Biology Inc.. All rights reserved.
PY - 2020/10/16
Y1 - 2020/10/16
N2 - MR1 presents vitamin B-related metabolites to mucosal associated invariant T (MAIT) cells, which are characterized, in part, by the TRAV1-21 ab T cell receptor (TCR). In addition, a more diverse TRAV1-22 MR1-restricted T cell repertoire exists that can possess altered specificity for MR1 antigens. However, the molecular basis of how such TRAV1-22 TCRs interact with MR1-antigen complexes remains unclear. Here, we describe how a TRAV12-21 TCR (termed D462-E4) recognizes an MR1-antigen complex. We report the crystal structures of the unliganded D462-E4 TCR and its complex with MR1 presenting the riboflavin-based antigen 5-OP-RU. Here, the TRBV29-1 b-chain of the D462-E4 TCR binds over the F9-pocket of MR1, whereby the complementarity-determining region (CDR) 3b loop surrounded and projected into the F9-pocket. Nevertheless, the CDR3b loop anchored proximal to the MR1 A9-pocket and mediated direct contact with the 5-OP-RU antigen. The D462-E4 TCR footprint on MR1 contrasted that of the TRAV1-21 and TRAV361 TCRs' docking topologies on MR1. Accordingly, diverse MR1-restricted T cell repertoire reveals differential docking modalities on MR1, thus providing greater scope for differing antigen specificities.
AB - MR1 presents vitamin B-related metabolites to mucosal associated invariant T (MAIT) cells, which are characterized, in part, by the TRAV1-21 ab T cell receptor (TCR). In addition, a more diverse TRAV1-22 MR1-restricted T cell repertoire exists that can possess altered specificity for MR1 antigens. However, the molecular basis of how such TRAV1-22 TCRs interact with MR1-antigen complexes remains unclear. Here, we describe how a TRAV12-21 TCR (termed D462-E4) recognizes an MR1-antigen complex. We report the crystal structures of the unliganded D462-E4 TCR and its complex with MR1 presenting the riboflavin-based antigen 5-OP-RU. Here, the TRBV29-1 b-chain of the D462-E4 TCR binds over the F9-pocket of MR1, whereby the complementarity-determining region (CDR) 3b loop surrounded and projected into the F9-pocket. Nevertheless, the CDR3b loop anchored proximal to the MR1 A9-pocket and mediated direct contact with the 5-OP-RU antigen. The D462-E4 TCR footprint on MR1 contrasted that of the TRAV1-21 and TRAV361 TCRs' docking topologies on MR1. Accordingly, diverse MR1-restricted T cell repertoire reveals differential docking modalities on MR1, thus providing greater scope for differing antigen specificities.
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U2 - 10.1074/jbc.RA120.015292
DO - 10.1074/jbc.RA120.015292
M3 - Article
C2 - 32817339
AN - SCOPUS:85093705727
SN - 0021-9258
VL - 295
SP - 14445
EP - 14457
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 42
ER -