Recognition of vitamin B metabolites by mucosal-associated invariant T cells

Onisha Patel, Lars Kjer-Nielsen, Jérôme Le Nours, Sidonia B. G. Eckle, Richard Birkinshaw, Travis Beddoe, Alexandra J. Corbett, Ligong Liu, John J. Miles, Bronwyn Meehan, Rangsima Reantragoon, Maria L. Sandoval-Romero, Lucy C. Sullivan, Andrew G. Brooks, Zhenjun Chen, David P. Fairlie, James McCluskey () and Jamie Rossjohn ()
Additional contact information
Onisha Patel: School of Biomedical Sciences, Monash University
Lars Kjer-Nielsen: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Jérôme Le Nours: School of Biomedical Sciences, Monash University
Sidonia B. G. Eckle: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Richard Birkinshaw: School of Biomedical Sciences, Monash University
Travis Beddoe: School of Biomedical Sciences, Monash University
Alexandra J. Corbett: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Ligong Liu: Institute for Molecular Bioscience, The University of Queensland
John J. Miles: Queensland Institute of Medical Research and Australian Centre for Vaccine Development
Bronwyn Meehan: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Rangsima Reantragoon: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Maria L. Sandoval-Romero: School of Biomedical Sciences, Monash University
Lucy C. Sullivan: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Andrew G. Brooks: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Zhenjun Chen: Peter Doherty Institute for Infection and Immunity, University of Melbourne
David P. Fairlie: Institute for Molecular Bioscience, The University of Queensland
James McCluskey: Peter Doherty Institute for Infection and Immunity, University of Melbourne
Jamie Rossjohn: School of Biomedical Sciences, Monash University

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract The mucosal-associated invariant T-cell antigen receptor (MAIT TCR) recognizes MR1 presenting vitamin B metabolites. Here we describe the structures of a human MAIT TCR in complex with human MR1 presenting a non-stimulatory ligand derived from folic acid and an agonist ligand derived from a riboflavin metabolite. For both vitamin B antigens, the MAIT TCR docks in a conserved manner above MR1, thus acting as an innate-like pattern recognition receptor. The invariant MAIT TCR α-chain usage is attributable to MR1-mediated interactions that prise open the MR1 cleft to allow contact with the vitamin B metabolite. Although the non-stimulatory antigen does not contact the MAIT TCR, the stimulatory antigen does. This results in a higher affinity of the MAIT TCR for a stimulatory antigen in comparison with a non-stimulatory antigen. We formally demonstrate a structural basis for MAIT TCR recognition of vitamin B metabolites, while illuminating how TCRs recognize microbial metabolic signatures.

Date: 2013
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DOI: 10.1038/ncomms3142

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