Fig 6.

Expression of several regulators involved in carbon catabolism in E. coli MG1655 and isogenic mutant strains. (a) Expression under aerobic conditions. (b) Expression under anaerobic conditions. The mutant strains bear one or more deletions in the galactose transport system (Mgl and GalP), a component of the maltose transporter (MalE), or the mannose PTS (ManX). 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.