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  • Original Paper
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Growth inhibition by CDK-cyclin and PCNA binding domains of p21 occurs by distinct mechanisms and is regulated by ubiquitin-proteasome pathway

Abstract

The CDK inhibitor, p21WAF1/Cip1 blocks cell cycle progression. In vitro, the N-terminus of p21 binds and inhibits CDK-cyclin kinase activity, whereas the C-terminus binds and inhibits PCNA (proliferating cell nuclear antigen) function. PCNA is essential for processivity of both DNA polymerase δ and ε. We have performed a detailed analysis of growth inhibition by the N- and C-terminal regions of p21, and determined whether the N- and C-terminal regions mediate this effect by different mechanisms. Expression of either the N- or the C-terminal region of p21 inhibits DNA synthesis and cell growth, but not as efficiently as full length p21. The effectiveness of the two p21 domains is dependent on their stability which is determined by the ubiquitin-proteasome pathway. The stabilization of the N- and C-terminal region of p21 increases their effectiveness as inhibitors of DNA synthesis to levels comparable to full length p21. Inhibition of DNA synthesis by the N-terminal region of p21 involves suppression of E2F activity. In contrast, inhibition by the C-terminal region of p21 is not accompanied by suppression of E2F activity, but is mediated via PCNA binding. The C-terminal region of p21 therefore inhibits cell growth by a mechanism distinct from that of the N-terminal region containing the CDK-cyclin inhibitory domain.

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Acknowledgements

The authors acknowledge the kind gifts of plasmids and reagents by K Helin (European Institute of Oncology, Milan, Spain), N Dyson and E Harlow (Harvard Medical School, Boston, MA, USA), D Bohmann and L Staszewski (EMBL, Heidelberg, Germany). We thank Howard Brickner for technical assistance. Jerome Boulaire is a recipient of doctoral fellowship from Region Rhône Alpes. Denis Rousseau was a recipient of fellowship from Société de Secours des Amis des Sciences. This work was supported by grants from INSERM (#930104), ARC (#9621) and Region Rhone Alpes (HO9873.08.12) to Rati Fotedar and by grants from the NIH (#AI31453, #CA74435) to Arun Fotedar.

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Rousseau, D., Cannella, D., Boulaire, J. et al. Growth inhibition by CDK-cyclin and PCNA binding domains of p21 occurs by distinct mechanisms and is regulated by ubiquitin-proteasome pathway. Oncogene 18, 3290–3302 (1999). https://doi.org/10.1038/sj.onc.1202681

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