《科学》 第393卷 第6812期 · 2026年8月13日 · 中文解读
TTF2通过姐妹染色单体交换处理有丝分裂期间未完成DNA复制的位点
TTF2 processes sites of incomplete DNA replication during mitosis via sister-chromatid exchanges · R. Fujisawa and K. P. M. Labib
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这篇讲什么
本文揭示了TTF2在有丝分裂期间通过姐妹染色单体交换处理未完成DNA复制位点的分子机制。
原文开头
sister- chromatid exchanges Ryo Fujisawa and Karim P. M. Labib* Mammalian cells frequently enter mitosis before DNA replication has finished, necessitating the rapid processing of unreplicated loci to facilitate chromosome segregation. the tRAIP ubiquitin ligase induces replisome disassembly during mitosis, triggering the cleavage of DNA replication forks. until now, the mechanisms that regulate tRAIP and process cleaved DNA replication forks were unclear. In this study, we show that the transcription termination factor 2 (ttF2) adenosine triphosphatase is a new type of phosphoreceptor that binds a conserved phosphorylation site on tRAIP during mitosis. ttF2 couples phosphorylated tRAIP to DNA polymerase ε (Pol ε) in the replisome, leading tRAIP to ubiquitylate the CDC45- MCM- gINs (CMg) helicase. …
摘自《科学》(Science)第393卷 第6812期 · 2026年8月13日,R. Fujisawa and K. P. M. Labib。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。

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