Department of Biology, Faculty of Medicine, Masaryk University, Brno CZ-625 00, Czech Republic.
DNA Repair (Amst). 2010 Mar 2;9(3):268-75. doi: 10.1016/j.dnarep.2010.01.007. Epub 2010 Jan 21.
Homologous recombination plays a key role in the maintenance of genome integrity, especially during DNA replication and the repair of double-stranded DNA breaks (DSBs). Just a single un-repaired break can lead to aneuploidy, genetic aberrations or cell death. DSBs are caused by a vast number of both endogenous and exogenous agents including genotoxic chemicals or ionizing radiation, as well as through replication of a damaged template DNA or the replication fork collapse. It is essential for cell survival to recognise and process DSBs as well as other toxic intermediates and launch most appropriate repair mechanism. Many helicases have been implicated to play role in these processes, however their detail roles, specificities and co-operativity in the complex protein-protein interaction networks remain unclear. In this review we summarize the current knowledge about Saccharomyces cerevisiae helicase Srs2 and its effect on multiple DNA metabolic processes that generally affect genome stability. It would appear that Srs2 functions as an "Odd-Job Man" in these processes to make sure that the jobs proceed when and where they are needed.
同源重组在维持基因组完整性方面起着关键作用,尤其是在 DNA 复制和双链 DNA 断裂 (DSB) 的修复过程中。即使只有一个未修复的断裂也可能导致非整倍体、遗传异常或细胞死亡。DSB 是由大量内源性和外源性因素引起的,包括遗传毒性化学物质或电离辐射,以及通过受损模板 DNA 的复制或复制叉崩溃。识别和处理 DSB 以及其他有毒中间体,并启动最合适的修复机制,对于细胞存活至关重要。许多解旋酶被认为在这些过程中发挥作用,但它们在复杂的蛋白质-蛋白质相互作用网络中的详细作用、特异性和协同作用仍不清楚。在这篇综述中,我们总结了目前关于酿酒酵母解旋酶 Srs2 的知识及其对多种一般影响基因组稳定性的 DNA 代谢过程的影响。Srs2 似乎在这些过程中充当“多面手”,以确保在需要时在需要的时间和地点完成工作。