Journal
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Volume 466, Issue 1, Pages 116-124Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2007.07.002
Keywords
Src-family tyrosine kinase; c-Src; c-Yes; Lyn; Fyn; Cdc2; mitosis; M phase; phosphorylation; electrophoretic mobility
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Src-family tyrosine kinases (SFKs) play an important role in mitosis. Despite overlapping expression of multiple SFK members, little is known about how individual SFK members are activated in M phase. Here, we examined mitotic activation of endogenous c-Src, c-Yes, and Lyn, which are co-expressed in HeLa cells. c-Src, c-Yes, and Lyn were activated at different levels in M phase, and the activation was inhibited by Cdc2 inactivation. Mitotic c-Src and c-Yes exhibited normal- and retarded-electrophoretic-mobility forms on SDS-polyacrylamide gels, whereas Lyn did not show mobility retardation. Like c-Src, the retardation of electrophoretic mobility of c-Yes was caused by Cdc2-mediated phosphorylation. The normal- and retarded-mobility forms of c-Sre were comparably activated, but activation of the retarded-mobility form of c-Yes was higher than that of the normal-mobility form of c-Yes. Thus, these results suggest that endogenous c-Src, c-Yes, and Lyn are differentially activated through Cdc2 activation during M phase. (c) 2007 Elsevier Inc. All rights reserved.
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