Download MendeleyATP-induced conformational changes of the nucleotide-binding domain of Na,K-ATPase
Hilge, M., Siegal, G., Vuister, G.W., Guentert, P., Gloor, S.M., Abrahams, J.P.(2003) Nat Struct Biol 10: 468-474
- PubMed: 12730684
- DOI: https://doi.org/10.1038/nsb924
- Primary Citation of Related Structures:
1MO7, 1MO8 - PubMed Abstract:
The Na,K-ATPase hydrolyzes ATP to drive the coupled extrusion and uptake of Na+ and K+ ions across the plasma membrane. Here, we report two high-resolution NMR structures of the 213-residue nucleotide-binding domain of rat alpha1 Na,K-ATPase, determined in the absence and the presence of ATP. The nucleotide binds in the anti conformation and shows a relative paucity of interactions with the protein, reflecting the low-affinity ATP-binding state. Binding of ATP induces substantial conformational changes in the binding pocket and in residues located in the hinge region connecting the N- and P-domains. Structural comparison with the Ca-ATPase stabilized by the inhibitor thapsigargin, E2(TG), and the model of the H-ATPase in the E1 form suggests that the observed changes may trigger the series of events necessary for the release of the K+ ions and/or disengagement of the A-domain, leading to the eventual transfer of the gamma-phosphate group to the invariant Asp369.
Organizational Affiliation:
Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands. hilge@nmr.kun.nl
