The Journal of Experimental Medicine
Accuri Cytometers
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Journal of Experimental Medicine, Vol 173, 1247-1256, Copyright © 1991 by Rockefeller University Press

ARTICLES

Regions of the T cell receptor alpha and beta chains that are responsible for interactions with CD3

L Tan, J Turner and A Weiss
Howard Hughes Medical Institute, Department of Medicine, San Francisco, California.

The T cell antigen receptor consists of the Ti alpha/beta heterodimer which recognizes antigen, and the associated CD3 chains, thought to be involved in signal transduction. To understand the nature of the interaction between Ti and CD3, chimeric molecules which included the COOH-terminal segments of Ti alpha or beta linked to the extracellular segment of CD8, were transfected into a mutant T cell deficient in Ti beta chain expression and cell surface CD3. Both chimeric chains were required to express the chimeric Ti and to restore CD3 surface expression. CD8/Ti and CD3 cointernalized and coimmunoprecipitated. Stimulation of the chimeric receptor induced transmembrane signaling events and cell activation. These results demonstrate that the Ti alpha and beta COOH termini containing the transmembrane domains are sufficient for structural and functional coupling of Ti to CD3.
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