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The p21 inhibitor of cyclin-dependent kinases controls DNA replication by interaction with PCNA

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Abstract

THE p53 tumour-suppressor protein controls the expression of a gene encoding the p21 cyclin-dependent protein kinase (CDK) regulator1–6. Levels of p21 protein are increased in senescent cells and p21 overexpression blocks the growth of tumour cells1,3,7. In normal human cells, but not in many tumour cells, p21 exists in a quaternary complex with a cyclin, a CDK, and the proliferating-cell nuclear antigen (PCNA) 5,8. p21 controls CDK activity, thereby affecting cell-cycle control2–4,6, whereas PCNA functions in both DNA replication9–12 and repair13. Here we use simian virus 40 DNA replication in vitro to show that p21 directly inhibits PCNA-dependent DNA replication in the absence of a cyclin/CDK. Furthermore, p21 blocks the ability of PCNA to activate DNA polymerase δ, the principal replicative DNA polymerase. This regulation results from a direct interaction between p21 and PCNA. Thus, during p53-mediated suppression of cell proliferation, p21 and PCNA may be important for coordinating cell-cycle progression, DNA replication and repair of damaged DNA.

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Authors and Affiliations

  1. Cold Spring Harbor Laboratory, PO Box 100, Bungtown Road, Cold Spring Harbor, New York, 11724, USA

    Shou Waga & Bruce Stillman

  2. Howard Hughes Medical Institute, PO Box 100, Bungtown Road, Cold Spring Harbor, New York, 11724, USA

    Gregory J. Hannon & David Beach

Authors
  1. Shou Waga
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  2. Gregory J. Hannon
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  3. David Beach
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  4. Bruce Stillman
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Waga, S., Hannon, G., Beach, D. et al. The p21 inhibitor of cyclin-dependent kinases controls DNA replication by interaction with PCNA. Nature 369, 574–578 (1994). https://doi.org/10.1038/369574a0

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