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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Role of Saccharomyces cerevisiae Msh2 and Msh3 repair proteins in double-strand break-induced recombination
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Role of Saccharomyces cerevisiae Msh2 and Msh3 repair proteins in double-strand break-induced recombination

机译:酿酒酵母Msh2和Msh3修复蛋白在双链断裂诱导的重组中的作用

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摘要

When gene conversion is initiated by a dou- ble-strand break (DSB), any nonhomologous DNA that may be present at the ends must be removed before new DNA synthesis can be initiated. In Saccharomyces cerevisiae, removal of non- homologous ends depends not only on the nucleotide excision repair endonuclease Rad1/Rad10 but also on Msh2 and Msh3, two proteins that are required to correct mismatched bp. These proteins have no effect when DSB ends are homol- ogous to the donor, either in the kinetics of recombination or in the proportion of gene conversions associated with cross- ing-over. A second DSB repair pathway, single-strand anneal- ing also requires Rad1/Rad10 and Msh2/Msh3, but reveals a difference in their roles.
机译:当通过双链断裂(DSB)启动基因转换时,必须去除末端可能存在的任何非同源DNA,然后才能开始新的DNA合成。在酿酒酵母中,非同源末端的去除不仅取决于核苷酸切除修复核酸内切酶Rad1 / Rad10,而且取决于Msh2和Msh3,这是纠正错配bp所需的两种蛋白质。当DSB末端与供体同源时,这些蛋白质在重组动力学或与杂交相关的基因转化比例方面均无作用。第二条DSB修复途径,单链退火也需要Rad1 / Rad10和Msh2 / Msh3,但揭示了它们的作用有所不同。

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