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. 1998 Jun 1;26(11):2598–2605. doi: 10.1093/nar/26.11.2598

Single point mutations located outside the inter-monomer domains abolish trimerization of Schizosaccharomyces pombe PCNA.

K Piard 1, G Baldacci 1, I Tratner 1
PMCID: PMC147618  PMID: 9592143

Abstract

We have generated proliferating cell nuclear antigen (PCNA) mutants by low fidelity PCR and screened for lethal mutations by testing for lack of complementation of a Schizosaccharomyces pombe strain disrupted for the pcn1 + gene. We thus identified eight lethal mutants out of the 50 cDNAs tested. Six were truncated in their C-terminal region due to the introduction of a stop codon within their coding sequences. Two were full-length with a single point mutation at amino acid 68 or 69. The two latter mutants were overexpressed in insect cells via a recombinant baculovirus and were purified. They were unable to stimulate DNA polymerase delta DNA replication activity on a poly(dA).oligo(dT) template. Cross-linking experiments showed that this was due to their inability to form trimers. Since these two mutations are adjacent and not located in a domain of the protein putatively involved in inter-monomer interactions, our results show that the beta-sheet betaF1 to which they belong must play an essential role in maintaining the 3-dimensional structure of S.pombe PCNA.

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Selected References

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