Fig. 1. An ompL null mutation does not suppress DTT sensitivity of a dsbA null mutant. Ten-fold serial dilutions of exponentially growing bacterial cultures were spotted on LB agar plates containing various DTT concentrations and incubated at 37°C for ∼18 h. A representative set of mutants derived from the wild-type strain MG1655 (WT) spotted on LB agar at 37°C with or without 10 mM DTT is shown. The corresponding mutations are indicated at the top of the figure. The ompL allele shown here is the ompL::mini-Tn10Kan^R allele (Dartigalongue et al., 2000).