Nucleotide Excision Repair DNA Synthesis by DNA Polymerase .epsilon. in the Presence of PCNA, RFC, and RPA

In eukaryotes, nucleotide excision repair of DNA is a complex process that requires many polypeptides to perform dual incision and remove a segment of about 30 nucleotides containing the damage, followed by repair DNA synthesis to replace the excised segment. Nucleotide excision repair DNA synthesis...

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Bibliographic Details
Published in:Biochemistry (Easton) 1995-04, Vol.34 (15), p.5011-5017
Main Authors: Shivji, Mahmud K. K, Podust, Vladimir N, Huebscher, Ulrich, Wood, Richard D
Format: Article
Language:English
Subjects:
Bacteriophage T4
DNA - radiation effects
DNA Ligases - metabolism
DNA Polymerase II
DNA Polymerase III
DNA Repair - physiology
DNA Replication - physiology
DNA-Binding Proteins - metabolism
DNA-Directed DNA Polymerase - metabolism
Exodeoxyribonucleases - metabolism
Flap Endonucleases
Homeodomain Proteins
Humans
Minor Histocompatibility Antigens
Proliferating Cell Nuclear Antigen - metabolism
Proto-Oncogene Proteins c-bcl-2
Replication Protein A
Replication Protein C
Repressor Proteins
Saccharomyces cerevisiae Proteins
Ultraviolet Rays
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Summary:In eukaryotes, nucleotide excision repair of DNA is a complex process that requires many polypeptides to perform dual incision and remove a segment of about 30 nucleotides containing the damage, followed by repair DNA synthesis to replace the excised segment. Nucleotide excision repair DNA synthesis is dependent on proliferating cell nuclear antigen (PCNA). To study gap-filling DNA synthesis during DNA nucleotide excision repair, UV-damaged DNA was first incubated with PCNA-depleted human cell extracts to create repair incisions. Purified DNA polymerase delta or epsilon, with DNA ligase, was then used to form the repair patch. DNA polymerase delta could perform repair synthesis and was strictly dependent on the presence of both PCNA and replication factor C, but gave rise to a very low proportion of complete, ligated circles. The presence of replication protein A (which is also required for nucleotide excision repair) did not alter this result, while addition of DNase IV increased the fraction of ligated products. DNA polymerase epsilon, on the other hand, could fill the repair patch in the absence of PCNA and replication factor C, and most of the products were ligated circles. Addition of replication protein A changed the situation dramatically, and synthesis by polymerase epsilon became dependent on both PCNA and replication factor C. A combination of DNA polymerase epsilon, PCNA, replication factor C, replication protein A, and DNA ligase I appears to be well-suited to the task of creating nucleotide excision repair patches.
ISSN:0006-2960
1520-4995
DOI:10.1021/bi00015a012