The yeast Saccharomyces cerevisiae vacuolar H+-ATPase (V-ATPase) is a multisubunit complex responsible for acidifying organelles. It functions as an ATP dependent proton pump that transports protons across a lipid bilayer. This domain corresponds to the N terminal domain of the H subunit of V-ATPase. The N-terminal domain is required for the activation of the complex whereas the C-terminal domain is required for coupling ATP hydrolysis to proton translocation [3].

1: Regulation of yeast ectoapyrase ynd1p activity by activator subunit Vma13p of vacuolar H+-ATPase. Zhong X, Malhotra R, Guidotti G; J Biol Chem 2000;275:35592-35599. PMID:10954728

2: Functional characterization of the N-terminal domain of subunit H (Vma13p) of the yeast vacuolar ATPase. Flannery AR, Stevens TH; J Biol Chem. 2008; [Epub ahead of print] PMID:18708638

3: Structural and functional separation of the N- and C-terminal domains of the yeast V-ATPase subunit H. Liu M, Tarsio M, Charsky CM, Kane PM; J Biol Chem. 2005;280:36978-36985. PMID:16141210