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• W1502287851 abstract "In Reuber rat hepatoma cells (R-Y121B), alkaline phosphatase activity increased without de novo enzyme synthesis (Sorimachi, K., and Yasumura, Y. (1986) Biochim. Biophys. Acta 885, 272-281). The enzyme was partially purified by butanol extraction from the particulate fractions. The incubation of the extracted alkaline phosphatase with the cytosol fraction induced a large increase in enzyme activity (5-10-fold of control). The dialyzed cytosol was more effective than the undialyzed cytosol during an early period of incubation at 37 degrees C. This difference between the dialyzed and the undialyzed cytosol fractions was due to endogenous Na+. For maximal activation of the enzyme, both Mg2+ above 1 mM and Zn2+ at low concentrations (below 0.01 mM) were needed, although Zn2+ at high concentrations (above 0.1 mM) showed an inhibitory effect. Zn2+ and Mg2+ alone slightly increased alkaline phosphatase activity. This activation of the enzyme was temperature dependent and was not observed at 0 or 4 degrees C. Polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate showed that the increase in alkaline phosphatase activity did not involve the fragmentation of the enzyme and that 65Zn2+ bound to it during enzyme activation with 65Zn2+ and Mg2+. The cytosol fraction not only supplied Zn2+ to the nascent enzyme but also increased the maximal enzyme activity more than did direct addition of metal ions. Ferritin and metallothionein contributed to the activation of alkaline phosphatase with the metal ions. Since the binding of Zn2+ and Mg2+ to the nascent alkaline phosphatase is disturbed in Reuber rat hepatoma cells (R-Y121B), the apoenzyme is accumulated inside the cells. The binding of Zn2+ and Mg2+ to the apoenzyme readily takes place in the cell homogenates accompanied by an increase in catalytic activity without new enzyme synthesis." @default.
• W1502287851 created "2016-06-24" @default.
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• W1502287851 date "1987-02-01" @default.
• W1502287851 modified "2023-09-30" @default.
• W1502287851 title "Activation of alkaline phosphatase with Mg2+ and Zn2+ in rat hepatoma cells. Accumulation of apoenzyme." @default.
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• W1502287851 doi "https://doi.org/10.1016/s0021-9258(19)75668-3" @default.
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