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• W2617467206 abstract "Abstract The Na + ,K + -ATPase is a plasma membrane ion transporter of high physiological importance for ion homeostasis and cellular excitability in electrically active tissues. Mutations in the genes coding for Na + ,K + -ATPase α-subunit isoforms lead to severe human pathologies including Familial Hemiplegic Migraine type 2 (FHM2), Alternating Hemiplegia of Childhood (AHC), Rapid Dystonia Parkinsonism (RDP) or epilepsy. Many of the reported mutations lead to change- or loss-of-function effects, whereas others do not alter the functional properties, but lead to e.g. reduced protein stability, reduced protein expression or defective plasma membrane targeting. Na + ,K + -ATPase frequently assembles with other membrane transporters or cellular matrix proteins in specialized plasma membrane microdomains, but the effects of these interactions on targeting or protein mobility are elusive so far. Mutational disruption of established interaction motifs of the Na + ,K + -ATPase with ankyrin B and caveolin-1 are expected to result in changes in plasma membrane targeting, changes of the localization pattern, and of the diffusion behavior of the enzyme. We studied the consequences of mutations in these binding sites by monitoring diffusion of eGFP-labeled Na + ,K + -ATPase constructs in the plasma membrane of living HEK293T cells by fluorescence correlation spectroscopy (FCS) as well as fluorescence recovery after photobleaching (FRAP) or photoswitching (FRAS) and observed significant differences compared to the wild-type enzyme, with synergistic effects for combinations of interaction site mutations. These measurements expand the possibilities to study the consequences of Na + ,K + -ATPase mutations and provide information about the interaction of Na + ,K + -ATPase α 2 -isoform with cellular matrix proteins, the cytoskeleton or other membrane protein complexes." @default.
• W2617467206 created "2017-06-05" @default.
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• W2617467206 date "2017-05-23" @default.
• W2617467206 modified "2023-10-03" @default.
• W2617467206 title "Disruption of ankyrin B and caveolin-1 interaction sites alters Na+,K+-ATPase lateral diffusion in HEK293 cell plasma membranes" @default.
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• W2617467206 doi "https://doi.org/10.1101/141291" @default.
• W2617467206 hasPublicationYear "2017" @default.
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