Download MendeleyCrystal structure of the cytoplasmic N-terminal domain of subunit I, a homolog of subunit a, of V-ATPase.
Srinivasan, S., Vyas, N.K., Baker, M.L., Quiocho, F.A.(2011) J Mol Biol 412: 14-21
- PubMed: 21787787
- DOI: https://doi.org/10.1016/j.jmb.2011.07.014
- Primary Citation of Related Structures:
3RRK - PubMed Abstract:
Subunit "a" is associated with the membrane-bound (V(O)) complex of eukaryotic vacuolar H(+)-ATPase acidification machinery. It has also been shown recently to be involved in diverse membrane fusion/secretory functions independent of acidification. Here, we report the crystal structure of the N-terminal cytosolic domain from the Meiothermus ruber subunit "I" homolog of subunit a. The structure is composed of a curved long central α-helix bundle capped on both ends by two lobes with similar α/β architecture. Based on the structure, a reasonable model of its eukaryotic subunit a counterpart was obtained. The crystal structure and model fit well into reconstructions from electron microscopy of prokaryotic and eukaryotic vacuolar H(+)-ATPases, respectively, clarifying their orientations and interactions and revealing features that could enable subunit a to play a role in membrane fusion/secretion.
Organizational Affiliation:
Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
