Nucleic Acids Research, 1989, Vol. 17, No. 12 4471-4484
© 1989
CHEMISTRY |
Human nucleotide excision repair in vitro: repair of pyrimidine dimers, psoralen and cisplatin adducts by HeLa cell-free extract
University of North Carolina School of Medicine, Department of Biochemistry Chapel Hill, NC 27599, USA
Received April 11, 1989. Revised May 19, 1989. Accepted May 19, 1989.
We searched for nucleotide excision repair in human cell-free extracts using two assays: damage-specific incision of DNA (the nicking assay) and damage-stimulated DNA synthesis (the repair synthesis assay). HeLa cell-free extract prepared by the method of Manley et al. (1980) has a weak nicking activity on UV irradiated DNA and the nicking is only slightly reduced when pyrimidine dimers are eliminated from the substrate by DNA photolyase. In contrast to the nicking assay, the extract gives a strong signal with UV irradiated substrate in the repair synthesis assay. The repair synthesis activity is ATP dependent and is reduced by about 50% by prior treatment of the substrate with DNA photolyase indicating that this fraction of repair synthesis is due to removal of pyrimidine dimers by nucleotide excision. Psoralen and cisplatin adducts which are known to be removed by nucleotide excision repair also elicited repair synthesis activity 5 – 10 fold above the background synthesis. When M13RF DNA containing a uniquely placed psoralen adduct was used in the reaction, complete repair was achieved in a fraction of molecules as evidenced by the restoration of psoralen inactivated Kpnl restriction site. This activity is absent in xeroderma pigmentosum group A cells. We conclude that our cell-free extract contains the human nucleotide excision repair enzyme activity.
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