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Mol Cell Biol. 1991 May; 11(5): 2583-2592

Cloning and characterization of DST2, the gene for DNA strand transfer protein beta from Saccharomyces cerevisiae.

Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709.

ABSTRACT

The gene encoding the 180-kDa DNA strand transfer protein beta from the yeast Saccharomyces cerevisiae was identified and sequenced. This gene, DST2 (DNA strand transferase 2), was located on chromosome VII. dst2 gene disruption mutants exhibited temperature-sensitive sporulation and a 50% longer generation time during vegetative growth than did the wild type. Spontaneous mitotic recombination in the mutants was reduced severalfold for both intrachromosomal recombination and intragenic gene conversion. The mutants also had reduced levels of the intragenic recombination that is induced during meiosis. Meiotic recombinants were, however, somewhat unstable in the mutants, with a decrease in recombinants and survival upon prolonged incubation in sporulation media. spo13 or spo13 rad50 mutations did not relieve the sporulation defect of dst2 mutations. A dst1 dst2 double mutant has the same phenotype as a dst2 single mutant. All phenotypes associated with the dst2 mutations could be complemented by a plasmid containing DST2.

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