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. 1997 Aug;146(4):1239–1251. doi: 10.1093/genetics/146.4.1239

Involvement of the Yeast DNA Polymerase δ in DNA Repair in Vivo

L Giot 1, R Chanet 1, M Simon 1, C Facca 1, G Faye 1
PMCID: PMC1208071  PMID: 9258670

Abstract

The POL3 encoded catalytic subunit of DNA polymerase δ possesses a highly conserved C-terminal cysteine-rich domain in Saccharomyces cerevisiae. Mutations in some of its cysteine codons display a lethal phenotype, which demonstrates an essential function of this domain. The thermosensitive mutant pol3-13, in which a serine replaces a cysteine of this domain, exhibits a range of defects in DNA repair, such as hypersensitivity to different DNA-damaging agents and deficiency for induced mutagenesis and for recombination. These phenotypes are observed at 24°, a temperature at which DNA replication is almost normal; this differentiates the functions of POL3 in DNA repair and DNA replication. Since spontaneous mutagenesis and spontaneous recombination are efficient in pol3-13, we propose that POL3 plays an important role in DNA repair after irradiation, particularly in the error-prone and recombinational pathways. Extragenic suppressors of pol3-13 are allelic to sdp5-1, previously identified as an extragenic suppressor of pol3-11. SDP5, which is identical to HYS2, encodes a protein homologous to the p50 subunit of bovine and human DNA polymerase δ. SDP5 is most probably the p55 subunit of Polδ of S. cerevisiae and seems to be associated with the catalytic subunit for both DNA replication and DNA repair.

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Selected References

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