Fig. 2.

Lipopolysaccharide profiles and β-galactosidase activities driven by P_pagP of the wild-type χ3761 and its isogenic mutants. (A) Lipopolysaccharide profiles of χ3761 (wild-type UK-1, 1st and 7th lanes) and χ8573 (ΔmsbB48), χ11165 (ΔmsbB48 ΔpagL7), χ9908 (ΔmsbB48 ΔpagP8), χ9949 (ΔmsbB48 ΔlpxR9), and χ11065 (ΔmsbB48 ΔpagL7 ΔpagP8 ΔlpxR9). (B) β-Galactosidase activities were determined in the wild-type (χ3761) and the msbB mutant (χ8573). Bacteria were grown for 6 h in N medium under the conditions indicated in the key. *, P < 0.05 compared with χ3761. β-Galactosidase activities for the wild-type and the ΔmsbB mutant strains without the lacZ reporter plasmid were <0.8.