RCSB PDB - 1SY6: Crystal Structure of CD3gammaepsilon Heterodimer in Complex with OKT3 Fab Fragment (original) (raw)
Crystal structure of the human T cell receptor CD3(epsilon)(gamma) heterodimer complexed to the therapeutic mAb OKT3.
[Kjer-Nielsen, L.](/search?q=citation.rcsb%5Fauthors:Kjer-Nielsen, L.), [Dunstone, M.A.](/search?q=citation.rcsb%5Fauthors:Dunstone, M.A.), [Kostenko, L.](/search?q=citation.rcsb%5Fauthors:Kostenko, L.), [Ely, L.K.](/search?q=citation.rcsb%5Fauthors:Ely, L.K.), [Beddoe, T.](/search?q=citation.rcsb%5Fauthors:Beddoe, T.), [Mifsud, N.A.](/search?q=citation.rcsb%5Fauthors:Mifsud, N.A.), [Purcell, A.W.](/search?q=citation.rcsb%5Fauthors:Purcell, A.W.), [Brooks, A.G.](/search?q=citation.rcsb%5Fauthors:Brooks, A.G.), [McCluskey, J.](/search?q=citation.rcsb%5Fauthors:McCluskey, J.), [Rossjohn, J.](/search?q=citation.rcsb%5Fauthors:Rossjohn, J.)
(2004) Proc Natl Acad Sci U S A 101: 7675-7680
PubMed Abstract:
The CD3 epsilon gamma heterodimer is essential for expression and function of the T cell receptor. The crystal structure of the human CD3 epsilon gamma heterodimer is described to 2.1-A resolution complexed with OKT3, a therapeutic mAb that not only activates and tolerizes mature T cells but also induces regulatory T cells. The mode of CD3 epsilon gamma dimerization provides a general structural basis for CD3 assembly and maps candidate T cell antigen receptor docking sites, including a duplicated linear region rich in acidic residues that is unique to human CD3 epsilon. OKT3 binds to an atypically small area of CD3 epsilon and has a low affinity for the isolated CD3 epsilon gamma heterodimer. The structure of the OKT3/CD3 epsilon gamma complex has implications for T cell signaling and therapeutic design.
Organizational Affiliation:
Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria 3010, Australia.