标题：Okazaki fragment processing: Modulation of the strand displacement activity of DNA polymerase δ by the concerted action of replication protein A, proliferating cell nuclear antigen, and flap endonuclease-1
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2001
卷号：98
期号：25
页码：14298-14303
DOI：10.1073/pnas.251193198
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：DNA polymerase (pol) {delta} is essential for both leading and lagging strand DNA synthesis during chromosomal replication in eukaryotes. Pol {delta} has been implicated in the Okazaki fragment maturation process for the extension of the newly synthesized fragment and for the displacement of the RNA/DNA segment of the preexisting downstream fragment generating an intermediate flap structure that is the target for the Dna2 and flap endonuclease-1 (Fen 1) endonucleases. Using a single-stranded minicircular template with an annealed RNA/DNA primer, we could measure strand displacement by pol {delta} coupled to DNA synthesis. Our results suggested that pol {delta} alone can displace up to 72 nucleotides while synthesizing through a double-stranded DNA region in a distributive manner. Proliferating cell nuclear antigen (PCNA) reduced the template dissociation rate of pol {delta
