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• W1993230731 endingPage "149" @default.
• W1993230731 startingPage "138" @default.
• W1993230731 abstract "Unrepaired DNA lesions often stall replicative DNA polymerases and are bypassed by translesion synthesis (TLS) to prevent replication fork collapse. Mechanisms of TLS are lesion- and species-specific, with a prominent role of specialized DNA polymerases with relaxed active sites. After nucleotide(s) are incorporated across from the altered base(s), the aberrant primer termini are typically extended by DNA polymerase ζ (pol ζ). As a result, pol ζ is responsible for most DNA damage-induced mutations. The mechanisms of sequential DNA polymerase switches in vivo remain unclear. The major replicative DNA polymerase δ (pol δ) shares two accessory subunits, called Pol31/Pol32 in yeast, with pol ζ. Inclusion of Pol31/Pol32 in the pol δ/pol ζ holoenzymes requires a [4Fe-4S] cluster in C-termini of the catalytic subunits. Disruption of this cluster in Pol ζ or deletion of POL32 attenuates induced mutagenesis. Here we describe a novel mutation affecting the catalytic subunit of pol ζ, rev3ΔC, which provides insight into the regulation of pol switches. Strains with Rev3ΔC, lacking the entire C-terminal domain and therefore the platform for Pol31/Pol32 binding, are partially proficient in Pol32-dependent UV-induced mutagenesis. This suggests an additional role of Pol32 in TLS, beyond being a pol ζ subunit, related to pol δ. In search for members of this regulatory pathway, we examined the effects of Maintenance of Genome Stability 1 (Mgs1) protein on mutagenesis in the absence of Rev3-Pol31/Pol32 interaction. Mgs1 may compete with Pol32 for binding to PCNA. Mgs1 overproduction suppresses induced mutagenesis, but had no effect on UV-mutagenesis in the rev3ΔC strain, suggesting that Mgs1 exerts its inhibitory effect by acting specifically on Pol32 bound to pol ζ. The evidence for differential regulation of Pol32 in pol δ and pol ζ emphasizes the complexity of polymerase switches." @default.
• W1993230731 created "2016-06-24" @default.
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• W1993230731 creator A5060879572 @default.
• W1993230731 date "2014-12-01" @default.
• W1993230731 modified "2023-10-10" @default.
• W1993230731 title "A novel variant of DNA polymerase ζ, Rev3ΔC, highlights differential regulation of Pol32 as a subunit of polymerase δ versus ζ in Saccharomyces cerevisiae" @default.
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• W1993230731 doi "https://doi.org/10.1016/j.dnarep.2014.04.013" @default.
• W1993230731 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4225194" @default.
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