Figure 4.
A putative metronidazole efflux system in 106-r. V-type ATPases are inserted into vesicular membranes and transported via microtubules and dynein/kinesin motors to the plasma membrane. These pumps use ATP to transport protons out of the cytosol against the diffusion gradient. An up-regulated sodium/proton antiporter exchanges in-flowing protons for sodium, increasing the extracellular sodium concentration. The MATE transporter is proposed to expel metronidazole as sodium flows back into the cell. Up-regulated genes (prefix GL50803 abbreviated to GL) are displayed next to proteins.
