Phosphorylation of cyclin-dependent kinases (CDKs) by the CDK-activating kinase (CAK) is required for the activation of the CDK kinase activity. The association of p21/p27 with the Cyclin A/E:Cdk2 complex prevents CAK mediated phosphorylation of Cdk2 (Aprelikova et al., 1995).
Aprelikova, O, Xiong, Y, Liu, ET
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