Reference: Gibbs PE, et al. (2005)
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Abstract
We have investigated the relative roles in vivo of Saccharomyces cerevisiae DNA polymerase eta, DNA polymerase zeta, Rev1 protein, and the DNA polymerase delta subunit, Pol32, in the bypass of an abasic site, T-T (6-4) photoadduct and T-T cis-syn cyclobutane dimer, by transforming strains deleted for RAD30, REV3, REV1, or POL32 with duplex plasmids carrying one of these DNA lesions located within a 28-nucleotide single-stranded region. DNA polymerase eta was found to be involved only rarely in the bypass of the T-T (6-4) photoadduct or the abasic sites in the sequence context used, although, as expected, it was solely responsible for the bypass of the T-T dimer. We argue that DNA polymerase zeta, rather than DNA polymerase delta as previously suggested, is responsible for insertion in bypass events other than those in which polymerase eta performs this function. However, DNA polymerase delta is involved indirectly in mutagenesis, since the strain lacking its Pol32 subunit, known to be deficient in mutagenesis, shows as little bypass of the T-T (6-4) photoadduct or the abasic sites as those deficient in Pol zeta or Rev1. In contrast, bypass of the T-T dimer in the pol32delta strain occurs at the wild-type frequency.
- Reference Type
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Comparative Study |
Journal Article |
Research Support, N.I.H., Extramural |
Research Support, U.S. Gov't, P.H.S.
- Authors
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Gibbs PE,
McDonald J,
Woodgate R,
Lawrence CW
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