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- W1669701013 abstract "A 4.3-kb EcoRI fragment from a Lactococcus lactis genomic library alleviates the methyl methanesulfonate, mitomycin C, and UV sensitivities of an Escherichia coli recA mutant (M. Novel, X. F. Huang, and G. Novel, FEMS Microbiol. Lett. 72:309-314, 1990). It complements recA1 and delta recA mutations but not recA13. Three proteins (with molecular masses of 20, 35, and 23 kDa) were produced from this fragment in a T7-directed system, and three corresponding genes were detected by DNA sequencing, namely, ISS1CH;lacX, which is the distal gene of the lac operon; and a third open reading frame, named lacN, which encodes 211 amino acids. Mutations produced in either lacX or in lacN resulted in the loss of the resistance to DNA-damaging agents. Thus, these two genes appeared to be involved in this activity. Introduction of pUCB214 carrying the 4.3-kb fragment into a lexA+ delta recA306 sfiA::lacZ strain resulted in UV-inducible synthesis of beta-galactosidase. A uvrA strain or a lexA (Ind-) strain containing pUCB214 did not support any DNA repair. However, a lexA (Def-) strain carrying pUCB214 could partly repair UV damage. We discuss possible targets for LacX and LacN products, and we speculate that LacX and LacN may constitute a two-component regulatory system that is able to respond to SOS signals, and then to act in the SOS response, bypassing the RecA-activated function." @default.
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- W1669701013 date "1995-01-01" @default.
- W1669701013 modified "2023-09-27" @default.
- W1669701013 title "Two Lactococcus lactis genes, including lacX, cooperate to trigger an SOS response in a recA-negative background" @default.
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- W1669701013 doi "https://doi.org/10.1128/jb.177.2.283-289.1995" @default.
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