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. 1992 Aug 15;89(16):7566–7570. doi: 10.1073/pnas.89.16.7566

Disruption of the CD4-p56lck complex is required for rapid internalization of CD4.

B P Sleckman 1, J Shin 1, V E Igras 1, T L Collins 1, J L Strominger 1, S J Burakoff 1
PMCID: PMC49751  PMID: 1502168

Abstract

CD4 is a cell surface glycoprotein expressed by a subset of T lymphocytes and functions to enhance T-cell activation. CD4 is noncovalently associated via the cytoplasmic domain with the protein-tyrosine kinase p56lck, a member of the src protein-tyrosine kinase family. Upon activation of protein kinase C by phorbol ester, CD4 is phosphorylated on cytoplasmic serine residues and internalized from the cell surface, and disruption of the CD4-p56lck complex occurs. The exact relationship between these events is likely to be functionally significant, as cytoplasmic-domain serine phosphorylation and internalization have been shown to regulate the function of receptors that possess intrinsic protein-tyrosine kinase activity. Here we demonstrate that p56lck slows the rate of phorbol 12-myristate 13-acetate-induced internalization of CD4 in a manner that depends on a physical association between p56lck and CD4. This decreased rate is due at least in part to a requirement for disruption of the CD4-p56lck complex prior to internalization of CD4. Furthermore, disruption of the CD4-p56lck complex appears to depend on the integrity of the cytoplasmic-domain serine at position 408, probably due to a requirement for phosphorylation.

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