6jxk

Rb+-bound E2-MgF state of the gastric proton pump (Wild-type)

spinqualitylabelsall models 6jxk, resolution 4.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6jxk is a 4 chain structure with sequence from Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 4.3Å Ligands: CLR, K, MF4, MG, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ATP4A_PIG Catalyzes the hydrolysis of ATP coupled with the exchange of H(+) and K(+) ions across the plasma membrane. Responsible for acid production in the stomach. Publication Abstract from PubMed The gastric proton pump (H(+),K(+)-ATPase), a P-type ATPase responsible for gastric acidification, mediates electro-neutral exchange of H(+) and K(+) coupled with ATP hydrolysis, but with an as yet undetermined transport stoichiometry. Here we show crystal structures at a resolution of 2.5 A of the pump in the E2-P transition state, in which the counter-transporting cation is occluded. We found a single K(+) bound to the cation-binding site of the H(+),K(+)-ATPase, indicating an exchange of 1H(+)/1K(+) per hydrolysis of one ATP molecule. This fulfills the energy requirement for the generation of a six pH unit gradient across the membrane. The structural basis of K(+) recognition is resolved and supported by molecular dynamics simulations, establishing how the H(+),K(+)-ATPase overcomes the energetic challenge to generate an H(+) gradient of more than a million-fold-one of the highest cation gradients known in mammalian tissue-across the membrane. A single K(+)-binding site in the crystal structure of the gastric proton pump.,Yamamoto K, Dubey V, Irie K, Nakanishi H, Khandelia H, Fujiyoshi Y, Abe K Elife. 2019 Aug 22;8. pii: 47701. doi: 10.7554/eLife.47701. PMID:31436534 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also ATPase 3D structures

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