Figure 7.

Accumulation of radioactive p‐aminobenzoic acid in cells expressing the mutant YdaH or MtrF transporter. (A) Mutants of the YdaH transporter. Cells possessing the mutant transporter D180A, W400A, P418A, or D429A show an increase in the level of [³H]‐PABA accumulations compared with cells expressing wild‐type YdaH. Error bars represent standard deviation (n = 3). (B) Mutants of the MtrF transporter. Cells possessing the mutant transporter D193A, W420A, P438A, or D449A show an increase in the level of [³H]‐PABA accumulations compared with cells expressing wild‐type MtrF. Error bars represent standard deviation (n = 3). The data showed in (A) and (B) are the cumulative average of three successive recordings.