English: E. coli SOS System: DNA damage from things such as cross-linking agents, UV irradiation, or alkylating agents. RecA, a LexA protease, senses that damaged protein and becomes activated by removing its repressor. Once the LexA dimer repressor is removed, the expression of LexA operon is autoregulatory. In addition to being a LexA protease, the RecA protein also catalyzes a few novel DNA reactions such as annealing of single-stranded DNA and transfer of strands.
The SOS system has enhanced DNA-repair capacity, including excision and post-replication repair, enhanced mutagenesis, prophage induction. The system also can cause inhibition of cell division and cessation of respiration
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