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J Bacteriol. 1989 October; 171(10): 5659-5667

research-article

REV3, a Saccharomyces cerevisiae gene whose function is required for induced mutagenesis, is predicted to encode a nonessential DNA polymerase.

A Morrison, R B Christensen, J Alley, A K Beck, E G Bernstine, J F Lemontt and C W Lawrence

Department of Biophysics, School of Medicine, University of Rochester, New York 14642.

ABSTRACT

We have cloned the REV3 gene of Saccharomyces cerevisiae by complementation of the rev3 defect in UV-induced mutagenesis. The nucleotide sequence of this gene encodes a predicted protein of Mr 172,956 showing significant sequence similarity to Epstein-Barr virus DNA polymerase and to other members of a class of DNA polymerases including human DNA polymerase alpha and yeast DNA polymerase I. REV3 protein shows less sequence identity, and presumably a more distant evolutionary relationship, to the latter two enzymes than they do to each other. Haploids carrying a complete deletion of REV3 are viable. We suggest that induced mutagenesis in S. cerevisiae depends on a specialized DNA polymerase that is not required for other replicative processes. REV3 is located 2.8 centimorgans from CDC60, on chromosome XVI.


J Bacteriol. 1989 October; 171(10): 5659-5667




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