Calf thymus RF-C as an essential component for DNA polymerase delta and epsilon holoenzymes function.
By using a complementation assay that enabled DNA polymerase delta and DNA polymerase epsilon to replicate a singly-DNA primed M13 DNA in the presence of proliferating cell nuclear antigen (PCNA) and Escherichia coli single-stranded DNA binding protein (SSB), we have purified from calf thymus in a five step procedure a multipolypeptide complex with molecular masses of polypeptides of 155, 70, 60, 58, 39 (doublet), 38 (doublet) and 36 kDa. The protein is very likely replication factor C (Tsurimoto, T. and Stillman, B. (1989) Mol. Cell. Biol. 9, 609-619). This conclusion is based on biochemical and physicochemical data and the finding that it contains a DNA stimulated ATPase which is under certain conditions stimulated by PCNA. Together RF-C, PCNA and ATP convert DNA polymerases delta and epsilon to holoenzyme forms, which were able to replicate efficiently SSB-covered singly-DNA primed M13 DNA. Calf thymus RF-C could form a primer recognition complex on a 3'-OH primer terminus in the presence of calf thymus PCNA and ATP. Holoenzyme complexes of DNA polymerase delta and epsilon could be isolated suggesting that these enzymes directly interact with the auxiliary proteins in a similar way. Under optimal replication conditions on singly-DNA primed M13 DNA the DNA synthesis rate of DNA polymerase delta was higher than of DNA polymerase epsilon. Based on these functional date possible roles of these two DNA polymerases in eukaryotic DNA replication are discussed.
Department of Pharmacology and Biochemistry, University Zürich-Irchel, Switzerland.
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Podust
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Georgaki
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Strack
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Hübscher
D000818:Animals; D001324:Autoantigens / Q000378:metabolism; D001435:Bacteriophages / Q000235:genetics; D002417:Cattle; D002850:Chromatography, Gel; D004258:DNA Polymerase III; D004261:DNA Replication / Q000502:physiology*; D004279:DNA, Viral / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism*; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism*; D018398:Homeodomain Proteins; D015778:Minor Histocompatibility Antigens; D009687:Nuclear Proteins / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen; D019253:Proto-Oncogene Proteins c-bcl-2; D051818:Replication Protein C; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D013950:Thymus Gland
D001324:Autoantigens; C096816:BCL2-related protein A1; D004279:DNA, Viral; D004268:DNA-Binding Proteins; D018398:Homeodomain Proteins; C096063:MATA1 protein, S cerevisiae; D015778:Minor Histocompatibility Antigens; D009687:Nuclear Proteins; D018809:Proliferating Cell Nuclear Antigen; D019253:Proto-Oncogene Proteins c-bcl-2; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D004258:DNA Polymerase III; D004259:DNA-Directed DNA Polymerase; D051818:Replication Protein C