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• W2557772103 abstract "Na+/K+-ATPase (NKA) is an essential cation pump protein responsible for the maintenance of the sodium and potassium gradients across the plasma membrane. Recently published high-resolution structures revealed amino acids forming the cation binding sites (CBS) in the transmembrane domain and variable position of the domains in the cytoplasmic headpiece. Here we report molecular dynamic simulations of the human NKA α1β1 isoform embedded into DOPC bilayer. We have analyzed the NKA conformational changes in the presence of Na+- or K+-cations in the CBS, for various combinations of the cytoplasmic ligands, and the two major enzyme conformations in the 100 ns runs (more than 2.5 μs of simulations in total). We identified two novel cytoplasmic pathways along the pairs of transmembrane helices TM3/TM7 or TM6/TM9 that allow hydration of the CBS or transport of cations from/to the bulk. These findings can provide a structural explanation for previous mutagenesis studies, where mutation of residues that are distal from the CBS resulted in the alteration of the enzyme affinity to the transported cations or change in the enzyme activity." @default.
• W2557772103 created "2016-12-08" @default.
• W2557772103 creator A5004029313 @default.
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• W2557772103 date "2016-12-14" @default.
• W2557772103 modified "2023-10-08" @default.
• W2557772103 title "Ion Pathways in the Na⁺/K⁺-ATPase" @default.
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• W2557772103 doi "https://doi.org/10.1021/acs.jcim.6b00353" @default.
• W2557772103 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27966362" @default.
• W2557772103 hasPublicationYear "2016" @default.
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