A 39 amino acid fragment of the cell cycle regulator p21 is sufficient to bind PCNA and partially inhibit DNA replication in vivo
Nucleic Acids Research, ISSN: 0305-1048, Vol: 24, Issue: 9, Page: 1727-1733
1996
- 75Citations
- 39Captures
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Metrics Details
- Citations75
- Citation Indexes75
- 75
- CrossRef56
- Captures39
- Readers39
- 39
Article Description
The cell cycle regulator p21 interacts with and inhibits the DNA replication and repair factor proliferating cell nuclear antigen (PCNA). We have defined a 39 amino acid fragment of p21 which is sufficient to bind PCNA with high affinity (K(d) 10-20 nM). This peptide can inhibit DNA replication in vitro and microinjection of a GST fusion protein containing this domain inhibited S phase in vivo. Despite its high affinity for PCNA, the free 39 amino acid peptide does not have a well-defined structure, as judged from circular dichroism and nuclear magnetic resonance measurements, suggesting an induced fit mechanism for the PCNA-p21 interaction. The association of the small peptide with PCNA was thermolabile, suggesting that portions of p21 adjoining the minimal region of contact stabilize the interaction. In addition, a domain containing 67 amino acids from the N-terminus of PCNA was defined as both necessary and sufficient for binding to p21.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0029873287&origin=inward; http://dx.doi.org/10.1093/nar/24.9.1727; http://www.ncbi.nlm.nih.gov/pubmed/8649992; https://academic.oup.com/nar/article-lookup/doi/10.1093/nar/24.9.1727; https://dx.doi.org/10.1093/nar/24.9.1727; https://academic.oup.com/nar/article/24/9/1727/1160077
Oxford University Press (OUP)
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