Figure 5. Conversion of a Gram-positive-only antibacterial into a compound that accumulates in E. coli and kills Gram-negative bacteria.
6DNM, 6DNM-NH3 and ciprofloxacin were evaluated against a panel of Gram-positive and Gram-negative organisms. E. coli MG1655 accumulation listed in nmol per 1012 CFUs. MIC values were determined using the micro-dilution broth method as outlined by the Clinical and Laboratory Standards Institute (http://clsi.org/) and are listed in μg ml−1. All experiments were performed in biological triplicate. Strains are listed in the Methods. The s.e.m. is reported for accumulation values.