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Crystal structure of the human T cell receptor CD3 epsilon gamma heterodimer complexed to the therapeutic mAb OKT3.

UniProtKB (3) Mapped (57) rdf/xml

Kjer-Nielsen L., Dunstone M.A., Kostenko L., Ely L.K., Beddoe T., Mifsud N.A., Purcell A.W., Brooks A.G., McCluskey J., Rossjohn J.

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.

Proc. Natl. Acad. Sci. U.S.A. 101:7675-7680(2004) [PubMed] [Europe PMC]