Download MendeleyVacuolar protein sorting: two different functional states of the AAA-ATPase Vps4p
Hartmann, C., Chami, M., Zachariae, U., de Groot, B.L., Engel, A., Gruetter, M.G.(2008) J Mol Biology 377: 352-363
- PubMed: 18272179
- DOI: https://doi.org/10.1016/j.jmb.2008.01.010
- Primary Citation of Related Structures:
2RKO - PubMed Abstract:
The vacuolar protein sorting (Vps) pathway, in which Vps4 class I AAA-ATPases play a central role, regulates growth factor receptors, immune response, and developmental signaling, and participates in tumor suppression, apoptosis, and retrovirus budding. We present the first atomic structure of the nucleotide-free yeast His(6)DeltaNVps4p dimer and its AMPPNP (5'-adenylyl-beta,gamma-imidodiphosphate)-bound tetradecamer, derived from a cryo electron microscopy map. Vps4p dimers form two distinct heptameric rings and accommodate AAA cassettes in a head-to-head--not in a head-to-tail-fashion as in class II AAA-ATPases. Our model suggests a mechanism for disassembling ESCRT (endosomal sorting complex required for transport) complexes by movements of substrate-binding domains located at the periphery of the tetradecamer during ATP hydrolysis in one ring, followed by translocation through the central pore and ATP hydrolysis in the second ring.
- Institute of Biochemistry, University of Zürich, Winterthurer Strasse 190, 8057 Zürich, Switzerland.
Organizational Affiliation:
