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. 1995 Apr;139(4):1521–1532. doi: 10.1093/genetics/139.4.1521

Interaction of Mre11 and Rad50: Two Proteins Required for DNA Repair and Meiosis-Specific Double-Strand Break Formation in Saccharomyces Cerevisiae

K Johzuka 1, H Ogawa 1
PMCID: PMC1206481  PMID: 7789757

Abstract

A temperature-sensitive mre11-1 mutation of Saccharomyces cerevisiae causes defects in meiotic recombination and DNA repair during vegetative grwoth at a restrictive temperature. We cloned the MRE11 gene and found that it encodes a 643-amino acid protein with a highly acidic region containing a heptad repeat of Asp at its C-terminus and is located downstream of YMR44 near the RNA1 locus on the right arm of chromosome XIII. Transcripts of the MRE11 gene increased transiently and showed the same kinetics as that of the RAD50 gene during meiosis. In a mre11 disruption mutant (mre11::hisG), meiosis-specific double-strand break (DSB) formation is abolished. A comparison of the properties of mre11::hisG and a rad50 deletion mutant (rad50δ) indicated that both mutants exhibited similar phenotypes in both meiosis and mitosis. Characterization of two double mutants, mre11::hisG rad50δ and mre11::hisG rad50S, showed that MRE11 and RAD50 belong to the same epistasis group with respect to meiotic DSB formation and mitotic DNA repair. Using a two-hybrid system, we found that Mre11 interacts with Rad50 and itself in vivo. These results suggest that Mre11 and Rad50 proteins work in a complex in DSB formation and DNA repair during vegetative growth.

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