Crystal structure of the regulatory subunit H of the V-type ATPase of Saccharomyces cerevisiae.Sagermann, M., Stevens, T.H., Matthews, B.W.
(2001) Proc.Natl.Acad.Sci.USA 98: 7134-7139
- PubMed: 11416198
- DOI: 10.1073/pnas.131192798
- PubMed Abstract:
- VMA13 encodes a 54-kDa vacuolar H(+)-ATPase subunit required for activity but not assembly of the enzyme complex in Saccharomyces cerevisiae.
Ho, M.N.,Hirata, R.,Umemoto, N.,Ohya, Y.,Takatsuki, A.,Stevens, T.H.,Anraku, Y.
(1993) J.Biol.Chem. 268: 18286
- Cloning, expression and crystallization of VMA13p, an essential subunit of the vacuolar H+-ATPase of Saccharomyces cerevisiae.
Sagermann, M.,Matthews, B.W.
(2000) Acta Crystallogr.,Sect.D 56: 475
In contrast to the F-type ATPases, which use a proton gradient to generate ATP, the V-type enzymes use ATP to actively transport protons into organelles and extracellular compartments. We describe here the structure of the H-subunit (also called Vma1 ...
In contrast to the F-type ATPases, which use a proton gradient to generate ATP, the V-type enzymes use ATP to actively transport protons into organelles and extracellular compartments. We describe here the structure of the H-subunit (also called Vma13p) of the yeast enzyme. This is the first structure of any component of a V-type ATPase. The H-subunit is not required for assembly but plays an essential regulatory role. Despite the lack of any apparent sequence homology the structure contains five motifs similar to the so-called HEAT or armadillo repeats seen in the importins. A groove, which is occupied in the importins by the peptide that targets proteins for import into the nucleus, is occupied here by the 10 amino-terminal residues of subunit H itself. The structural similarity suggests how subunit H may interact with the ATPase itself or with other proteins. A cleft between the amino- and carboxyl-terminal domains also suggests another possible site of interaction with other factors.
Institute of Molecular Biology, University of Oregon, Eugene, OR 97403-1229, USA.