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. 1988 Oct;8(10):4353–4361. doi: 10.1128/mcb.8.10.4353

Alterations of the lymphocyte-specific protein tyrosine kinase (p56lck) during T-cell activation.

A Veillette 1, I D Horak 1, E M Horak 1, M A Bookman 1, J B Bolen 1
PMCID: PMC365508  PMID: 3141789

Abstract

The lymphocyte-specific tyrosine protein kinase p56lck is abundantly expressed in L3T4+ (CD4+) and Lyt-2+ (CD8+) T-lymphocytes, where it is predominantly phosphorylated in vivo on the carboxy-terminal tyrosine residue 505 (Y-505). Upon exposure to activating signals (mitogenic lectins, antibodies to the T-cell receptor), the p56lck expressed in normal cloned murine T-cells is modified into a product which migrates at approximately 59 kilodaltons on sodium dodecyl sulfate-polyacrylamide gels and which possesses several amino-terminal serine phosphorylations. The changes in both mobility and amino-terminal phosphorylation can be reproduced by known activators of protein kinase C (4 alpha-phorbol 12 beta-myristate, dioctanoylglycerol), suggesting that this signal transduction pathway (or related pathways) mediates at least part of these events. Interestingly, agents raising intracellular calcium (such as A23187) cause the appearance of several of these amino-terminal phosphorylation changes but do not cause the pronounced shift in electrophoretic mobility. These data suggest that at least two serine kinase systems are implicated in the alterations of p56lck associated with T-cell activation and that the lck gene product plays a critical role in normal T-cell physiology.

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