Nucleic Acids Research, Vol 25, Issue 6 1136-1141, Copyright © 1997 by Oxford University Press
Z He and CJ Ingles
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.
ARTICLES
Isolation of human complexes proficient in nucleotide excision repair
Banting and Best Department of Medical Research, University of Toronto, Toronto, Ontario M5G 1L6, Canada.
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