Abstract
In Saccharomyces cerevisiae, Rad52 plays major roles in several types of homologous recombination. Here, we found that rad52-K200R mutation greatly reduced sumoylation of Rad52. The rad52-K200R mutant exhibited defects in various types of recombination, such as intrachromosomal recombination and mating-type switching. The K200 residue of Rad52 is part of the nuclear localization signal (NLS), which is important for transport into the nucleus. Indeed, the addition of a SV40 NLS to Rad52-K200R suppressed the sumoylation defect of Rad52-K200R. These findings indicate that nuclear localization of Rad52 is pre-requisite for its sumoylation.
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