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. 1997 Mar 15;25(6):1136–1141. doi: 10.1093/nar/25.6.1136

Isolation of human complexes proficient in nucleotide excision repair.

Z He 1, C J Ingles 1
PMCID: PMC146571  PMID: 9092621

Abstract

More than 20 polypeptides are required for the process of nucleotide excision repair (NER) in both human and yeast cells. This pathway of excision repair has most often been viewed as an ordered multi-step process involving steps of damage recognition, incision/excision and finally repair DNA synthesis. Here we present evidence for the existence of a complex of human NER proteins pre-assembled in the absence of damaged DNA. This multi-protein complex was initially isolated from HeLa cell extracts by affinity chromatography on a matrix containing the damage recognition protein XPA. Subsequent co-immunoprecipitation and gel filtration experiments demonstrated that a significant portion of the human NER proteins was present in the form of a high molecular weight complex and that these complexes, or repairosomes, were capable of performing all steps of NER in vitro . Consistent with studies indicating that DNA polymerasesdeltaandstraightepsiloncan both function in NER, these two polymerases are found in these repairosome complexes.

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Selected References

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