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proteins. Page last changed on 19 Dec 2016.
ATPase, class VI, type 11A
The protein encoded by this gene is an integral membrane ATPase. The encoded protein is probably phosphorylated in its intermediate state and likely drives the transport of ions such as calcium across membranes. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008] (from
Poulsen et al., Århus, Denmark. In Methods Mol Biol, Dec 2015
The transport of three Na(+) per two K(+) means that the Na,K-ATPase is electrogenic, and though the currents generated by the ion pump are small compared to ion channel currents, they can be measured using electrophysiology, both steady-state pumping and individual steps in the transport cycle.
Akiyama et al., Okazaki, Japan. In Science, Aug 2015
The slow ATPase is coupled with another ATPase catalyzing autodephosphorylation in the carboxyl-terminal half of KaiC, yielding the circadian response frequency of intermolecular interactions with other clock-related proteins that influences the transcription and translation cycle.
Rubinstein et al., Toronto, Canada. In Nature, Jun 2015
The eukaryotic V-ATPase is the most complex rotary ATPase: it has three peripheral stalks, a hetero-oligomeric proton-conducting proteolipid ring, several subunits not found in other rotary ATPases, and is regulated by reversible dissociation of its catalytic and proton-conducting regions.
In the absence of Ca(2+) and at pH 7 or higher, the ATPase is predominantly in E1, not in E2 (low affinity for Ca(2+)), and if millimolar Mg(2+) is present, one Mg(2+) is expected to occupy one of the Ca(2+)-binding sites with a millimolar dissociation constant.
This novel model for ion transport by the Na(+)/K(+)-ATPase is established by electrophysiological studies of C-terminal mutations in familial hemiplegic migraine 2 (FHM2) and is further substantiated by molecular dynamics simulations.