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Figure 6 | BMC Microbiology

Figure 6

From: A functional VipA-VipB interaction is required for the type VI secretion system activity of Vibrio cholerae O1 strain A1552

Figure 6

An intact VipA-VipB interaction is important for the ability of V. cholerae A1552 to compete with E. coli. V. cholerae parental strain A1552, ΔvipA and ΔvipA expressing wild-type VipA or mutated variants thereof were mixed (3:1) with E. coli MC4100 and incubated under T6SS-inducing conditions (340 mM NaCl, 37°C) on filters. After 5 h of incubation, the filters were resuspended in PBS, serially diluted and spread on E. coli selective plates in triplicates. Shown is the number of surviving E. coli (log10) from one representative experiment out of four. The inoculum control shows the starting number of E. coli prior to the 5 h incubation, while the LB control shows the number of E. coli obtained after 5 h of incubation in the absence of V. cholerae. The ability of a strain to compete with E. coli was compared with that of ΔvipA (** P < 0.01; *** P < 0.001). The experiment was repeated 4 times.

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