4x6d | pdb_00004x6d
CD1a ternary complex with endogenous lipids and BK6 TCR
Structural highlights
FunctionCD1A_HUMAN Antigen-presenting protein that binds self and non-self lipid and glycolipid antigens and presents them to T-cell receptors on natural killer T-cells.[1] [2] [3] Publication Abstract from PubMedA central paradigm in alphabeta T cell-mediated immunity is the simultaneous co-recognition of antigens and antigen-presenting molecules by the alphabeta T cell antigen receptor (TCR). CD1a presents a broad repertoire of lipid-based antigens. We found that a prototypical autoreactive TCR bound CD1a when it was presenting a series of permissive endogenous ligands, while other lipid ligands were nonpermissive to TCR binding. The structures of two TCR-CD1a-lipid complexes showed that the TCR docked over the A' roof of CD1a in a manner that precluded direct contact with permissive ligands. Nonpermissive ligands indirectly inhibited TCR binding by disrupting the TCR-CD1a contact zone. The exclusive recognition of CD1a by the TCR represents a previously unknown mechanism whereby alphabeta T cells indirectly sense self antigens that are bound to an antigen-presenting molecule. alphabeta T cell antigen receptor recognition of CD1a presenting self lipid ligands.,Birkinshaw RW, Pellicci DG, Cheng TY, Keller AN, Sandoval-Romero M, Gras S, de Jong A, Uldrich AP, Moody DB, Godfrey DI, Rossjohn J Nat Immunol. 2015 Mar;16(3):258-266. doi: 10.1038/ni.3098. Epub 2015 Feb 2. PMID:25642819[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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