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- W2166114045 abstract "Highly purified transverse tubule membranes isolated from frog skeletal muscle phosphorylate phosphatidylinositol to phosphatidylinositol 4-phosphate and phosphatidylinositol (4,5)-bisphosphate. The two phosphorylation reactions have different calcium requirements. Phosphorylation of phosphatidylinositol to phosphatidylinositol 4-phosphate, which takes place in both isolated transverse tubules and sarcoplasmic reticulum membranes, is independent of calcium in a range of concentrations from 10−9 to 10−6m, and is progressively inhibited to 10% of the maximal values by increasing calcium to 10−4m or higher (K0.5 = 5 × 10−6M). In contrast, phosphorylation of phosphatidylinositol 4-phosphate to phosphatidylinositol (4,5)-bisphosphate, a reaction exclusively present in transverse tubule membranes, is maximal at calcium concentrations higher than 2 × 10−6m and decreases to 30% of maximal values at calcium concentrations of 2 × 10−7m or lower (K0.5 = 10−6M). Unlike frog membranes, transverse tubules from rabbit muscle need exogenous phosphatidylinositol 4-phosphate in order to produce the bisphosphate derivative in the same range of calcium concentrations. Inositol (1,4,5)-trisphosphate has been proposed recently as a chemical messenger in excitation-contraction coupling in skeletal muscle. Calcium regulation of the synthesis of phosphatidylinositol (4,5)-bisphosphate, the membrane-bound precursor of inositol (1,4,5)-trisphosphate, might have physiological implications regarding modulation of excitation-contraction coupling by intracellular calcium levels." @default.
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- W2166114045 date "1988-04-01" @default.
- W2166114045 modified "2023-10-17" @default.
- W2166114045 title "Calcium modulation of phosphoinositide kinases in transverse tubule vesicles from frog skeletal muscle" @default.
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- W2166114045 doi "https://doi.org/10.1016/0003-9861(88)90199-3" @default.
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