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*L-TYROSINE
The Journal of Immunology, 2000, 164: 5-8.
Copyright © 2000 by The American Association of Immunologists

CUTTING EDGE

Cutting Edge: Tyrosine-Independent Transmission of Inhibitory Signals by CTLA-41

Tomas Cinek, Ali Sadra and John B. Imboden2

Department of Medicine, Rosalind Russell Research Laboratory, San Francisco General Hospital, and University of California, San Francisco, CA 94143

CTLA-4 is an important inhibitor of T cell activation. We used Jurkat cells expressing mutants of murine CTLA-4 to study the structural requirements for inhibitory signaling. We find that signals for the inhibition of IL-2 secretion are delivered efficiently by a CTLA-4 mutant in which both cytoplasmic tyrosines have been replaced by phenylalanines. A CTLA-4 mutant that lacks the carboxyl-terminal half of the intracellular domain also retains the ability to inhibit, but deletion of an additional 11 aa completely abrogates that capability. We conclude that delivery of an inhibitory signal requires the membrane-proximal region of the CTLA-4 cytoplasmic domain and does not depend upon the tyrosine phosphorylation of CTLA-4.




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