The influence of AphB on V. cholerae outer membrane composition, SDS resistance, and toxT expression. (A). Analysis of outer membrane preparations of V. cholerae derivatives. SDS-PAGE gel stained with Coomassie blue. OmpT and OmpU are indicated at the right. The minimum bactericidal concentration (MBC) of SDS is listed below the SDS-PAGE gel. (B). Wild type or aphB mutant containing a P
-luxCDABE reporter plasmid with or without pBAD-tcpPH were grown under the AKI condition. 0.01% arabinose was added to induce P
-tcpPH. Lux expression (blue bars) was measured and normalized against toxT expression in wild type. The results are the average of three experiments ± SD.