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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Ordered intracellular RecA--DNA assemblies: A potential site of in vivo RecA-mediated activities
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Ordered intracellular RecA--DNA assemblies: A potential site of in vivo RecA-mediated activities

机译:有序的细胞内RecA-DNA组装:体内RecA介导的活动的潜在位点

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摘要

The inducible SOS response increases the ability of bacteria to cope with DNA damage through various DNA repair processes in which the RecA protein plays a central role. Here we present the first study of the morphological aspects that accompany the SOS response in Escherichia coli. We find that induction of the SOS system in wild-type bacteria results in a fast and massive intracel- lular coaggregation of RecA and DNA into a lateral macroscopic assembly. The coaggregates comprise substantial portions of both the cellular Reot and the DNA complement. The structural features of the coaggregates and their relation to in vitro Reot--DNA networks, as well as morphological studies of strains carrying Reot mutants, are all consistent with the possibility that the intracellular assemblies represent a functional entity in which RecA-mediated DNA repair and protection activities occur.
机译:可诱导的SOS响应通过RecA蛋白在其中发挥重要作用的各种DNA修复过程增强了细菌应对DNA损伤的能力。在这里,我们介绍了伴随大肠杆菌中SOS反应的形态学方面的首次研究。我们发现,在野生型细菌中诱导SOS系统会导致RecA和DNA在细胞内快速大量聚集,形成侧向宏观组装。所述共聚集体包含细胞Reot和DNA补体两者的大部分。聚集体的结构特征及其与体外Reot-DNA网络的关系以及携带Reot突变体的菌株的形态学研究均与细胞内组装体代表RecA介导的DNA修复功能实体的可能性一致并进行保护活动。

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