Cyclin-stimulated binding of Cks proteins to cyclin-dependent kinases

被引:31
作者
Egan, EA
Solomon, MJ
机构
[1] Yale Univ, Sch Med, Dept Mol Biophys & Biochem, New Haven, CT 06520 USA
[2] Yale Univ, Sch Med, Dept Cell Biol, New Haven, CT 06520 USA
关键词
D O I
10.1128/MCB.18.7.3659
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Although Cks proteins were the first identified binding partners of cyclin-dependent protein kinases (cdks), their cell cycle functions have remained unclear. To help elucidate the function of Cks proteins, we examined whether their binding to p34(cdc2) (the mitotic cdk) varies during the cell cycle in Xenopus egg extracts. We observed that binding of human CksHs2 to p34(cdc2) was stimulated by cyclin B. This stimulation was dependent on the activating phosphorylation of p34(cdc2) On Thr-161, Which follows cyclin binding and is mediated by the cdk-activating kinase. Neither the inhibitory phosphorylations of p34(cdc2) nor the catalytic activity of p34(cdc2) was required for this stimulation. Stimulated binding of CksHs2 to another cdk, p33(cdk2), required both cyclin A and activating phosphorylation. Our findings support recent models that suggest that Cks proteins target active forms of p34(cdc2) to substrates.
引用
收藏
页码:3659 / 3667
页数:9
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