ATP2B2-wa (PMCA2-wa) transports Ca2+ from the cytosol to the extracellular region

Stable Identifier
Reaction [transition]
Homo sapiens
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ATP2B2 (wa isoform) is located in the plasma membrane of stereocilia bundles of inner hair cells and outer hair cells and transports calcium ions from the cytosol to the extracellular region with concomitant hydrolysis of ATP (Ficarella et al. 2007, Giacomello et al. 2011, and observed in rat and mouse). ATP2B2 appears to facilitate an efflux of calcium ions that enter the stereocilia during depolarization caused by the opening of the mechanoelectrical transduction channel, hence ATP2B2 plays a role in repolarization of the cell (Ficarella et al. 2007, Giacomello et al. 2011, and observed in rat and mouse).
Literature References
PubMed ID Title Journal Year
17234811 A functional study of plasma-membrane calcium-pump isoform 2 mutants causing digenic deafness

Carafoli, E, Brini, M, Petrillo, M, Domi, T, Ortolano, S, Lelli, A, Gasparini, P, Di Leva, F, Shull, GE, Lim, D, Mammano, F, Ficarella, R, Donaudy, F, Bortolozzi, M, Fedrizzi, L, Melchionda, S

Proc. Natl. Acad. Sci. U.S.A. 2007
22047666 Mutations in PMCA2 and hereditary deafness: a molecular analysis of the pump defect

Brini, M, Primerano, S, Campeol, M, Giacomello, M, Carafoli, E, De Mario, A, Lopreiato, R

Cell Calcium 2011
Catalyst Activity

P-type calcium transporter activity of ATP2B2 isoform wa [plasma membrane]

Inferred From
Cross References
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