Evidence for a second function for Saccharomyces cerevisiae Rev1p - PubMed (original) (raw)
Evidence for a second function for Saccharomyces cerevisiae Rev1p
J R Nelson et al. Mol Microbiol. 2000 Aug.
Free article
Abstract
The function of the Saccharomyces cerevisiae REV1 gene is required for translesion replication and mutagenesis induced by a wide variety of DNA-damaging agents. We showed previously that Rev1p possesses a deoxycytidyl transferase activity, which incorporates dCMP opposite abasic sites in the DNA template, and that dCMP insertion is the major event during bypass of an abasic site in vivo. However, we now find that Rev1p function is needed for the bypass of a T-T (6-4) UV photoproduct, a process in which dCMP incorporation occurs only very rarely, indicating that Rev1p possesses a second function. In addition, we find that Rev1p function is, as expected, required for bypass of an abasic site. However, replication past this lesion was also much reduced in the G-193R rev1-1 mutant, which we find retains substantial levels of deoxycytidyl transferase activity. This mutant is, therefore, presumably deficient principally in the second, at present poorly defined, function. The bypass of an abasic site and T-T (6-4) lesion also depended on REV3 function, but neither it nor REV1 was required for replication past the T-T dimer; bypass of this lesion presumably depends on another enzyme.
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