Abstract
Fragmented heavy sarcoplasmic reticulum was solubilized by cholate, and proteins were subsequently fractionated by using diethylaminoethyl-cellulose (DEAE-cellulose) column chromatography. A fraction was collected in which proteins with molecular weights between 31,000 and 45,000 u were major components. This fraction, when incorporated into Ca2+ -loaded liposomes, facilitated the Ca2+ efflux. The rate of efflux was regulated by the external Ca2+ concentration, reaching a maximum at 3 microM Ca2+. The Ca2+ efflux was suppressed by Mg2+.
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