FIG. 5.
cbbII::lacZ fusion quantitation in R. sphaeroides ccoP and prrA mutant strains grown under different culture conditions. β-Galactosidase activity was measured in cell extracts of R. sphaeroides strains harboring plasmid pVKCII grown to mid-exponential phase under the following growth conditions: chemoheterotrophic (CH) (A), chemoautotrophic (CA) (B), photoheterotrophic (PH) (C), or photoautotrophic (PA) (D). WT, wild-type strain 2.4.1HR; CCOP, strain CcoP1; PRRA, strain PrrA; CP, strain CcoPPrrA. Standard deviations are indicated as error bars. Numbers above bars are the means. All values are based on multiple assays of at least three independent cultures.