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    Biochem Soc Trans. 2005 Aug;33(Pt 4):883-5.

    Structural features and nucleotide-binding capability of the C subunit are integral to the regulation of the eukaryotic V1Vo ATPases.

    Grüber G.

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    Universität des Saarlandes, Fachrichtung 2.5-Biophysik, Universitätsbau 76, D-66421 Homburg, Germany. ggrueber@ntu.edu.sg

    Abstract

    V-ATPases (vacuolar ATPases) are responsible for acidification of intracellular compartments and, in certain cases, proton transport across the plasma membrane of eukaryotic cells. They are composed of a catalytic V1 sector, in which ATP hydrolysis takes place, and the Vo sector, which functions in proton conduction. The best established mechanism for regulating the V-ATPase activity in vivo involves reversible dissociation of the V1 and Vo domains, in which subunit C is intimately involved. In the last year, impressive progress has been made in elucidating the structure of the C subunit and its arrangement inside the V-ATPase. Nucleotide occupancy by subunit C, followed by conformational changes of this subunit has shed light on the mechanism of V-ATPase regulation.

    PMID:
    16042619
    [PubMed - indexed for MEDLINE]

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