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Rad51双链DNA结合能力决定复制叉修复通路选择:E135D与K305N突变揭示 ...
复制叉停滞后的修复通路如何“排班”一直成谜。UC Davis团队锁定酵母Rad51,发现E135D、K305N两突变大幅削弱其对dsDNA的亲和力,却保留ssDNA结合与D-loop活性,导致MMS诱导的 fork 保护失效、突变率飙升,并迫使细胞转向TLS与Rad51非依赖的模板转换。该工作首次直接证实Rad51-dsDNA相互作用是调控post-replication ...
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