Cyclin A is synthesized and associates with Cdc2 in G1. Cyclin dependent kinases are themselves catalytically inactive due to the fact that their active sites are blocked by a portion of the CDK molecule itself. Binding to their corresponding cyclin partner results in a conformational change that partially exposes the active site.
Piwnica-Worms, H, Wu, Z, Liu, F, Stanton, JJ
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