Alterations in tyrosine protein phosphorylation induced by antibody-mediated cross-linking of the CD4 receptor of T lymphocytes.

Molecular and Cellular Biology
A VeilletteM A Bookman

Abstract

Accumulating data suggest that the CD4 T-cell surface antigen transduces an independent intracellular signal during antigen-mediated T-cell activation. CD4 is physically associated with the internal membrane tyrosine protein kinase p56lck and can mediate, after antibody-mediated cross-linking, the rapid enzymatic activation of Lck, implying that CD4 signalling may involve changes in tyrosine protein phosphorylation. In this report, we describe that cross-linking of CD4 results in a series of rapid changes in intracellular tyrosine protein phosphorylation. The most prominent CD4-induced tyrosine phosphorylation change involved p56lck, which became extensively phosphorylated on the carboxy-terminal tyrosine residue 505 and, to a lesser extent, lymphocytes can transduce an intracellular signal resulting in tyrosine protein phosphorylation and strongly suggest that this property of CD4 is mediated through p56lck.

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