Homologous regions of Fen1 and p21Cip1 compete for binding to the same site on PCNA: a potential mechanism to co-ordinate DNA replication and repair (original) (raw)

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• Published: 15 May 1997

Oncogene volume 14, pages 2313–2321 (1997)Cite this article

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Abstract

Following genomic damage, the cessation of DNA replication is co-ordinated with onset of DNA repair; this co-ordination is essential to avoid mutation and genomic instability. To investigate these phenomena, we have analysed proteins that interact with PCNA, which is required for both DNA replication and repair. One such protein is p21Cip1, which inhibits DNA replication through its interaction with PCNA, while allowing repair to continue. We have identified an interaction between PCNA and the structure specific nuclease, Fen1, which is involved in DNA replication. Deletion analysis suggests that p21Cip1 and Fen1 bind to the same region of PCNA. Within Fen1 and its homologues a small region (10 amino acids) is sufficient for PCNA binding, which contains an 8 amino acid conserved PCNA-binding motif. This motif shares critical residues with the PCNA-binding region of p21Cip1. A PCNA binding peptide from p21Cip1 competes with Fen1 peptides for binding to PCNA, disrupts the Fen1-PCNA complex in replicating cell extracts, and concomitantly inhibits DNA synthesis. Competition between homologous regions of Fen1 and p21Cip1 for binding to the same site on PCNA may provide a mechanism to co-ordinate the functions of PCNA in DNA replication and repair.

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Author notes

1. Lynne S Cox
   Present address: Department of Biochemistry, University of Oxford, Oxford, OX1 3QU

Authors and Affiliations

1. Department Anatomy and Physiology, CRC Laboratories, University of Dundee, Dundee, DD1 4HN, UK
   Emma Warbrick & David M Glover
2. Department Biochemistry, CRC Laboratories, University of Dundee, Dundee, DD1 4HN, UK
   David P Lane & Lynne S Cox

Authors

1. Emma Warbrick
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2. David P Lane
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3. David M Glover
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4. Lynne S Cox
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Warbrick, E., Lane, D., Glover, D. et al. Homologous regions of Fen1 and p21Cip1 compete for binding to the same site on PCNA: a potential mechanism to co-ordinate DNA replication and repair.Oncogene 14, 2313–2321 (1997). https://doi.org/10.1038/sj.onc.1201072

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• Received: 08 November 1996
• Revised: 29 January 1997
• Accepted: 29 January 1997
• Issue Date: 15 May 1997
• DOI: https://doi.org/10.1038/sj.onc.1201072

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