Aksenov S V
Division of Radiation and Radiobiological Research, Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia; Tel.: +
J Biol Phys. 1999 Jun;25(2-3):263-77. doi: 10.1023/A:1005163310168.
The SOS response in Escherichia coli is induced after DNA-damaging treatments including ultraviolet light. Regulation of the SOS response is accomplished through specific interaction of the two SOS regulator proteins, LexA and RecA. In ultraviolet light-treated cells, nucleotide excision repair is the major system that removes the induced lesions from the DNA. Here, induction of the SOS response in Escherichia coli with normal and impaired excision repair function is studied by simulation of intracellular levels of regulatory LexA and RecA proteins, and SulA protein. SulA protein is responsible for SOS-inducible cell division inhibition. Results of the simulations show that nucleotide excision repair influences time-courses of LexA, RecA and SulA induction by modulating the dynamics of RecA protein distribution between its normal and SOS-activated forms.
大肠杆菌中的SOS应答在包括紫外线在内的DNA损伤处理后被诱导。SOS应答的调节是通过两种SOS调节蛋白LexA和RecA的特异性相互作用来完成的。在紫外线处理的细胞中,核苷酸切除修复是从DNA中去除诱导损伤的主要系统。在此,通过模拟调节性LexA、RecA蛋白和SulA蛋白的细胞内水平,研究了具有正常和受损切除修复功能的大肠杆菌中SOS应答的诱导情况。SulA蛋白负责SOS诱导的细胞分裂抑制。模拟结果表明,核苷酸切除修复通过调节RecA蛋白在其正常形式和SOS激活形式之间的分布动态,影响LexA、RecA和SulA诱导的时间进程。