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. 2017 Aug 2;45(16):9788–9796. doi: 10.1093/nar/gkx687

Figure 6.

Figure 6.

Effect of α-helical peptide 4E1 on UV resistance of Escherichia coli and the bacterial SOS-response in vivo. (A) Escherichia coli cell survival, depending on the dose of UV irradiation in the absence and the presence of expression of RecX protein and peptide 4E1. (B) Effect of RecX and peptide 4E1 expression on the magnitude of SOS-response in E. coli GY6871 cells in vivo when exposed to nalidixic acid (bars #2–#5). In the absence of IPTG-dependent RecX induction (bar #2) or IPTG-induced pep4 expression (bar #4) SOS-response increased in eight to nine times relative to its baseline values (bar#1), as measured in Muller units(M.u.).