Figure 2. In situ structure of the AcrAB-TolC multidrug efflux pump.
(A) Side view of the efflux pump density map. (B) Cross section views of the pump at the dashed box positions in (A), with the model of in vitro pump (PDB: 5NG5) fitted in density. (C) Cross section view through the center of the pump with the fitted model. OM, outer membrane; IM, inner membrane.