4L4V
Structure of human MAIT TCR in complex with human MR1-RL-6-Me-7-OH
Summary for 4L4V
Entry DOI | 10.2210/pdb4l4v/pdb |
Related | 4GUP 4L4T |
Descriptor | Major histocompatibility complex class I-related gene protein, Beta-2-microglobulin, MAIT T-cell receptor alpha chain, ... (7 entities in total) |
Functional Keywords | mhc class i-related protein, mait tcr, immune system, vitamin b metabolites, membrane protein-immune system complex, membrane protein/immune system |
Biological source | Homo sapiens (human) More |
Cellular location | Cell membrane; Single-pass membrane protein; Extracellular side. Isoform 4: Secreted: Q95460 Secreted: P61769 |
Total number of polymer chains | 8 |
Total formula weight | 188245.77 |
Authors | Patel, O.,Kjer-Nielsen, L.,Le Nours, J.,Eckle, S.B.G.,Birkinshaw, R.W.,Beddoe, T.,Corbett, A.J.,Liu, L.,Miles, J.J.,Meehan, B.,Reantragoon, R.,Sandoval-Romero, M.L.,Sullivan, L.C.,Brooks, A.G.,Chen, Z.,Fairlie, D.P.,McCluskey, J.,Rossjohn, J. (deposition date: 2013-06-09, release date: 2013-07-17, Last modification date: 2024-11-20) |
Primary citation | Patel, O.,Kjer-Nielsen, L.,Le Nours, J.,Eckle, S.B.,Birkinshaw, R.,Beddoe, T.,Corbett, A.J.,Liu, L.,Miles, J.J.,Meehan, B.,Reantragoon, R.,Sandoval-Romero, M.L.,Sullivan, L.C.,Brooks, A.G.,Chen, Z.,Fairlie, D.P.,McCluskey, J.,Rossjohn, J. Recognition of vitamin B metabolites by mucosal-associated invariant T cells. Nat Commun, 4:2142-2142, 2013 Cited by PubMed 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. PubMed: 23846752DOI: 10.1038/ncomms3142 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (1.9 Å) |
Structure validation
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