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Nucleic Acids Research, 2000, Vol. 28, No. 6 1424-1427
© 2000 Oxford University Press

Requirement for PCNA and RPA in interstrand crosslink-induced DNA synthesis

Lei Li, Carolyn A. Peterson1, Xiaoshan Zhang1 and Randy J. Legerski1,*

Department of Experimental Radiation Oncology and 1Department of Molecular Genetics, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA

Proliferating nuclear cell antigen (PCNA) and replication protein A (RPA) have proven to be essential elements in many aspects of DNA metabolism including replication, repair and recombination. We have developed an in vitro assay in which the presence of an interstrand crosslink stimulates the incorporation of radiolabeled nucleotides into both damaged and undamaged plasmid DNAs. Using this assay we have investigated the roles of PCNA and RPA in crosslink-induced DNA synthesis. p21, a potent inhibitor of PCNA, was found to strongly inhibit crosslink-induced incorporation. Addition of exogenous PCNA partially restored the resynthesis activity. Likewise, neutralization of RPA by monoclonal antibodies also inhibited incorporation, but the effect was somewhat more pronounced on the undamaged plasmid than the damaged plasmid. Addition of excess RPA also partially reversed antibody inhibition. These results indicate that both PCNA and RPA are required for efficient in vitro DNA resynthesis induced by interstrand crosslinks.

* To whom correspondence should be addressed. Tel: +1 713 792 8941; Fax: +1 713 794 4295; Email: rlegersk@mdanderson.org


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