Arabidopsis RAD51, RAD51C and XRCC3 proteins form a complex and facilitate RAD51 localization on chromosomes for meiotic recombination

文献类型： 外文期刊

第一作者： Su, Hang

作者： Su, Hang;Cheng, Zhihao;Huang, Jiyue;Lin, Juan;Ma, Hong;Wang, Yingxiang;Su, Hang;Cheng, Zhihao;Huang, Jiyue;Lin, Juan;Ma, Hong;Wang, Yingxiang;Cheng, Zhihao;Copenhaver, Gregory P.;Copenhaver, Gregory P.;Copenhaver, Gregory P.;Ma, Hong

作者机构：

期刊名称：PLOS GENETICS （ 影响因子：5.917； 五年影响因子：6.284 ）

ISSN： 1553-7404

年卷期： 2017 年 13 卷 5 期

页码：

收录情况： SCI

摘要： Meiotic recombination is required for proper homologous chromosome segregation in plants and other eukaryotes. The eukaryotic RAD51 gene family has seven ancient paralogs with important roles in mitotic and meiotic recombination. Mutations in mammalian RAD51 homologs RAD51C and XRCC3 lead to embryonic lethality. In the model plant Arabidopsis thaliana, RAD51C and XRCC3 homologs are not essential for vegetative development but are each required for somatic and meiotic recombination, but the mechanism of RAD51C and XRCC3 in meiotic recombination is unclear. The non-lethal Arabidopsis rad51c and xrcc3 null mutants provide an opportunity to study their meiotic functions. Here, we show that AtRAD51C and AtXRCC3 are components of the RAD51-dependent meiotic recombination pathway and required for normal AtRAD51 localization on meiotic chromosomes. In addition, AtRAD51C interacts with both AtRAD51 and AtXRCC3 in vitro and in vivo, suggesting that these proteins form a complex (es). Comparison of AtRAD51 foci in meiocytes from atrad51, atrad51c, and atxrcc3 single, double and triple heterozygous mutants further supports an interaction between AtRAD51C and AtXRCC3 that enhances AtRAD51 localization. Moreover, atrad51c(-/+) atxrcc3(-/+) double and atrad51(-/+) atrad51c(-/+) atxrcc3(-/+) triple heterozygous mutants have defects in meiotic recombination, suggesting the role of the AtRAD51C-AtXRCC3 complex in meiotic recombination is in part AtRAD51-dependent. Together, our results support a model in which direct interactions between the RAD51C-XRCC3 complex and RAD51 facilitate RAD51 localization on meiotic chromosomes and RAD51-dependent meiotic recombination. Finally, we hypothesize that maintenance of RAD51 function facilitated by the RAD51C-XRCC3 complex could be highly conserved in eukaryotes.

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