Subunit Rotation of Vacuolar-type Proton Pumping ATPase

Vacuolar-type ATPases V1V0 (V-ATPases) are found ubiquitously in the endomembrane organelles of eukaryotic cells. In this study, we genetically introduced a His tag and a biotin tag onto the c and G subunits, respectively, of Saccharomyces cerevisiae V-ATPase. Using this engineered enzyme, we observed directly the continuous counter-clockwise rotation of an actin filament attached to the G subunit when the enzyme was immobilized on a glass surface through the c subunit. V-ATPase generated essentially the same torque as the F-ATPase (ATP synthase). The rotation was inhibited by concanamycin and nitrate but not by azide. These results demonstrated that the V- and F-ATPase carry out a common rotational catalysis.

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