FIG. 4.

4-Chlorobiphenyl degradation activities of mutant strains with insertion mutations in RHDO electron transfer components. The results for HDB3 (A), HDA3 (B), and HDT4 (C), with insertion mutations in ebdA3, bphA3, and etbA4, respectively, are presented. The remaining amount of 4-chlorobiphenyl was determined by gas chromatography-mass spectrometry. The degradation activities of the strains harboring plasmids for complementation are also shown. Each value is the mean of triplicate independent experiments, with the standard deviation indicated by error bars. Symbols are explained to the right of the panels. Plasmids are indicated in parentheses, and the mutation genotype of a strain and the wild-type gene in a plasmid are indicated in square brackets.