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1mo8
From Proteopedia
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ATPase
Overview
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.
About this Structure
1MO8 is a Single protein structure of sequence from Rattus norvegicus with ATP as ligand. Active as Sodium/potassium-exchanging ATPase, with EC number 3.6.3.9 Full crystallographic information is available from OCA.
Reference
ATP-induced conformational changes of the nucleotide-binding domain of Na,K-ATPase., Hilge M, Siegal G, Vuister GW, Guntert P, Gloor SM, Abrahams JP, Nat Struct Biol. 2003 Jun;10(6):468-74. PMID:12730684
Page seeded by OCA on Tue Nov 20 21:34:41 2007
