Figure 4

LacZ expression from P _omcA (A) and P _mtrC (B). WT cells harboring pMEomcA-150 or pMEmtrC-203 were grown with oxygen (white bars), 10 mM fumarate (light gray bars) or 50 mM fumarate (dark gray bars) as the electron acceptor, and their LacZ activities were measured in the mid-logarithmic (ML) and early stationary (ES) growth phases. The error bars represent the standard deviation calculated from at least three measurements. The LacZ activity in WT cells harboring pMElacZ (control vector) was below 3 Miller units under all of the tested conditions (data not shown).