ATP2B1 (PMCA1) located in the basolateral membrane of inner hair cells transports calcium ions from the cytosol to the extracellular region with concomitant hydrolysis of ATP (inferred from the rat homolog). The efflux of calcium ions is believed to participate in repolarization of the cell.
calcium transmembrane transporter activity, phosphorylative mechanism of ATP2B1 [plasma membrane]
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