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A Mg-independent high affinity Ca-ATPase has recently been reported to be present in the plasma membranes of smooth muscle. This enzyme has now been solubilized using deoxycholate. The membrane-bound and the solubilized enzymes resemble each other in Km for Ca2+, and inhibition by fluphenazine. The solubilized enzyme is, however, more sensitive to inhibition by Mg2+ than the membrane bound enzyme. Radiation inactivation analysis shows that whereas the membrane-bound enzyme had a target size of 98,000 +/- 4,000 Daltons, the solubilized enzyme was only 70,000, +/- 7,000 Daltons.
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