calcium ATPase
Usually used of the calcium-pumping ATPase present in high concentration as an integral membrane protein of the sarcoplasmic reticulum of muscle. This pump lowers the cytoplasmic calcium level and causes contraction to stop. Normal function of the pump seems to require a local phospholipid environment from which cholesterol is excluded.

Dictionary of molecular biology. 2004.

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  • calcium pump — the mechanism of active transport of calcium (Ca2+) across a membrane, as of the sarcoplasmic reticulum of muscle cells, against a concentration gradient; the mechanism is driven by the hydrolysis of ATP by the membrane bound enzyme Ca2+ ATPase …   Medical dictionary

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