ArticlePflugers Archiv : European journal of physiology2009
The non-gastric H,K-ATPase as a tool to study the ouabain-binding site in Na,K-ATPase.
Article in Pflugers Archiv : European journal of physiology, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 19 citations in OpenAlex.
- A missense variant of the ATP1A2 gene is associated with a novel phenotype of progressive sensorineural hearing loss associated with migraine.European journal of human genetics : EJHG · 2015Article
- Ouabain binding site in a functioning Na+/K+ ATPase.The Journal of biological chemistry · 2011Article
- Half a century of ion-transport ATPases: the P- and V-type ATPases.Pflugers Archiv : European journal of physiology · 2009Article
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6 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
Based on studies with chimeras between (non-)gastric H,K-ATPase and Na,K-ATPase, a model for the ouabain binding site has recently been presented (Qiu et al. J.Biol.Chem. 280 (2005) 32349). In this model, hydrogen bonds between specific amino acid residues of Na,K-ATPase and hydroxyl groups of ouabain play a crucial role. In the present study, a series of ouabain analogues were tested on baculovirus-expressed Na,K-ATPase and an ouabain-sensitive mutant of non-gastric H,K-ATPase (D312E/ S319G/ A778P/ I795L/ F802C). For each analogue, the results obtained by measuring ATPase inhibition and [(3)H]ouabain replacement agreed rather well. In Na,K-ATPase, strophanthidin had a 7-10 times higher and digoxin a 4-12 times lower affinity than ouabain. The results of the non-gastric H,K-ATPase mutant were rather similar to that of Na,K-ATPase with exception of dihydro-ouabain that showed a much lower affinity with the non-gastric H,K-ATPase mutant. Docking studies showed that all analogues bind to the same pocket in Na,K-ATPase. However, the amino acids to which hydrogen bonds were formed differed and depended on the availability of hydroxyl or keto groups in the ouabain analogues.
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