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. 1993 Nov 19;75(4):805-16.
doi: 10.1016/0092-8674(93)90499-g.

The p21 Cdk-interacting protein Cip1 is a potent inhibitor of G1 cyclin-dependent kinases

J W Harper  1 , G R Adami, N Wei, K Keyomarsi, S J Elledge
Affiliations

The p21 Cdk-interacting protein Cip1 is a potent inhibitor of G1 cyclin-dependent kinases

J W Harper et al. Cell. .

Abstract

The cyclin-dependent kinase Cdk2 associates with cyclins A, D, and E and has been implicated in the control of the G1 to S phase transition in mammals. To identify potential Cdk2 regulators, we have employed an improved two-hybrid system to isolate human genes encoding Cdk-interacting proteins (Cips). CIP1 encodes a novel 21 kd protein that is found in cyclin A, cyclin D1, cyclin E, and Cdk2 immunoprecipitates. p21CIP1 is a potent, tight-binding inhibitor of Cdks and can inhibit the phosphorylation of Rb by cyclin A-Cdk2, cyclin E-Cdk2, cyclin D1-Cdk4, and cyclin D2-Cdk4 complexes. Cotransfection experiments indicate that CIP1 and SV40 T antigen function in a mutually antagonistic manner to control cell cycle progression.

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