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  • Title: Effects of a Ca2+ gradient and water activity on the phosphorylation of Ca(2+)-ATPase by Pi.
    Author: Caldeira MT, de Meis L.
    Journal: FEBS Lett; 1991 Aug 19; 288(1-2):10-2. PubMed ID: 1831769.
    Abstract:
    The effects of dimethyl sulfoxide (20% v/v) on the phosphorylation of Ca(2+)-ATPase of the sarcoplasmic reticulum by Pi vary depending on whether or not a Ca2+ gradient is formed across the vesicle membranes. In the absence of a Ca2+ gradient the solvent promotes a large increase in the affinity for Pi. This increase is no longer observed after the formation of a Ca2+ gradient. The enzyme affinity for Mg2+ is practically the same in the presence and absence of a gradient. Addition of dimethyl sulfoxide leads to an increase of the enzyme affinity for Mg2+ both in the presence and in the absence of a gradient.
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