Involvement of XRCC1 and DNA ligase III gene products in DNA base excision repair - PubMed (original) (raw)
. 1997 Sep 19;272(38):23970-5.
doi: 10.1074/jbc.272.38.23970.
Affiliations
- PMID: 9295348
- DOI: 10.1074/jbc.272.38.23970
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Involvement of XRCC1 and DNA ligase III gene products in DNA base excision repair
E Cappelli et al. J Biol Chem. 1997.
Free article
Abstract
DNA ligase III and the essential protein XRCC1 are present at greatly reduced levels in the xrcc1 mutant CHO cell line EM-C11. Cell-free extracts prepared from these cells were used to examine the role of the XRCC1 gene product in DNA base excision repair in vitro. EM-C11 cell extract was partially defective in ligation of base excision repair patches, in comparison to wild type CHO-9 extracts. Of the two branches of the base excision repair pathway, only the single nucleotide insertion pathway was affected; no ligation defect was observed in the proliferating cell nuclear antigen-dependent pathway. Full complementation of the ligation defect in EM-C11 extracts was achieved by addition to the repair reaction of recombinant human DNA ligase III but not by XRCC1. This is consistent with the notion that XRCC1 acts as an important stabilizing factor of DNA ligase III. These data demonstrate for the first time that xrcc1 mutant cells are partially defective in ligation of base excision repair patches and that the defect is specific to the polymerase beta-dependent single nucleotide insertion pathway.
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