alexa Regulation of oxidative phosphorylation in the inner membrane of rat liver mitochondria by calcium ions.
Biochemistry

Biochemistry

Biochemistry & Analytical Biochemistry

Author(s): Evtodienko YV, Azarashvili TS, Teplova VV, Odinokova IV, Saris N

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Abstract The effect of accumulation of Ca2+ at physiological concentrations (10(-8)-10(-6) M) on the rates of ATP synthesis and hydrolysis in rat liver mitochondria was studied. An addition of 5 x 10(-7) M Ca2+ resulted in the maximal rates of synthesis and hydrolysis of ATP. Decrease in the concentration of Ca2+ to 10-8 M or its increase to 5 x 10(-6) M inhibited oxidative phosphorylation and ATP hydrolysis. It was found that the rate of oxidative phosphorylation correlated with the phosphorylation level of a 3.5-kD peptide in the mitochondrial inner membrane on varying the Ca2+ concentration. The possible regulation of oxidative phosphorylation in mitochondria by Ca2+ is discussed.
This article was published in Biochemistry (Mosc) and referenced in Biochemistry & Analytical Biochemistry

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