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. 1990 Dec;172(12):6620–6630. doi: 10.1128/jb.172.12.6620-6630.1990

Effects of multiple yeast rad3 mutant alleles on UV sensitivity, mutability, and mitotic recombination.

J M Song 1, B A Montelone 1, W Siede 1, E C Friedberg 1
PMCID: PMC210772  PMID: 2174856

Abstract

A yeast strain was constructed that had a disruption of the chromosomal RAD3 gene and carried a series of centromeric plasmids with defined mutations in this gene. Using this isogenic collection, we examined sensitivity to UV radiation, spontaneous and UV radiation-induced mutagenesis, and mitotic recombination. Several alleles resulted in a marked increase in UV sensitivity. Most of these alleles were found to carry mutations located in consensus motifs for DNA helicases. Other alleles caused a modest or no increase in UV sensitivity and carried mutations in regions of the Rad3 polypeptide that are apparently not conserved. This correlation suggests that the DNA helicase activity of Rad3 protein is required for nucleotide excision repair of DNA. Some rad3 alleles conferred a marked increase in the frequency of spontaneous mutagenesis, including nonsuppressor reversion of the lys2-1 ochre mutation. These alleles also showed a good correlation with conserved DNA helicase domains, suggesting that the Rad3 DNA helicase also plays a role in the fidelity of DNA synthesis or postreplicative mismatch correction. Several rad3 mutator alleles also resulted in increased levels of mitotic recombination. Increased spontaneous mutagenesis and mitotic recombination are characteristic features of the Rem- phenotype. However, in contrast to the prototypic Rem- phenotype, the rad3 mutator alleles identified in this study did not confer inviability in the presence of mutations in the RAD50 or RAD52 gene required for strand break repair of DNA.

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Selected References

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