Fig 5.

Expression of transport systems in E. coli MG1655 and isogenic mutant strains in glucose minimal medium under aerobic conditions (a) or anaerobic conditions (b). The mutant strains bear deletions of the glucose PTS (PtsG), the galactose transport system (MglBAC and GalP), a component of the maltose transporter (MalEFG), or the mannose PTS (ManXYZ). Average data from 4 independent cultivations per strain and condition are shown. Gene expression was normalized to the expression level of the wild type. The horizontal lines mark the significance levels; only changes above the solid line or below the dotted one were regarded as significant.