Multiple Degradation Pathways Regulate Versatile CIP/KIP CDK Inhibitors

Overview

Journal Trends Cell Biol

Specialty Cell Biology

Date 2011 Dec 14

PMID 22154077

Citations 95

Authors

Natalia G Starostina

Edward T Kipreos

Affiliations

Soon will be listed here.

Abstract

The mammalian CIP/KIP family of cyclin-dependent kinase (CDK) inhibitors (CKIs) comprises three proteins--p21(Cip1/WAF1), p27(Kip1), and p57(Kip2)--that bind and inhibit cyclin-CDK complexes, which are key regulators of the cell cycle. CIP/KIP CKIs have additional independent functions in regulating transcription, apoptosis and actin cytoskeletal dynamics. These divergent functions are performed in distinct cellular compartments and contribute to the seemingly contradictory observation that the CKIs can both suppress and promote cancer. Multiple ubiquitin ligases (E3s) direct the proteasome-mediated degradation of p21, p27 and p57. This review analyzes recent data highlighting our current understanding of how distinct E3 pathways regulate subpopulations of the CKIs to control their diverse functions.

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