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• W1968287534 abstract "Submitochondrial particles from soybean (Glycine max L. cv Jupiter) hypocotyls with an ATPase activity of 0.3 to 1.0 micromole per minute per milligram were prepared by sonication with Mg-ATP. The particles catalyzed ATP synthesis with NADH and succinate; the ratios of ATP/O with these substrates were 1.0 and 0.1, respectively. As monitored by oxonol-VI, the particles built up and maintained a membrane potential that was higher with NADH than with succinate or Mg-ATP. The ATPase activity of the particles increased two to threefold by preincubation with 50 millimolar phosphate at a temperature of 38 degrees C. The increase in ATPase activity became higher (five to sixfold) when particles were preincubated with Mg-ATP plus phosphate. Under the latter conditions, collapse of DeltamuH by carbonyl cyanide p-trifluoromethoxyphenylhydrazone prevented the activation. An increase in ATPase activity of the particles was also observed with NADH and succinate, although activation was lower with succinate. With these substrates, phosphate did not increase ATPase activation. When particles were preincubated with Mg-ATP, anions that stimulate ATP hydrolysis (malate, malonate, and bicarbonate) had an activating effect similar to that of phosphate. The data suggest that the soybean mitochondrial ATPase can be activated by DeltamuH but that this activation is increased by the binding of certain anions to a conformation of the enzyme that appears during hydrolytic cycles." @default.
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• W1968287534 date "1988-06-01" @default.
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• W1968287534 title "Effect of the Electrochemical Proton Gradient and Anions on the ATPase Activity of Soybean Submitochondrial Particles" @default.
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• W1968287534 doi "https://doi.org/10.1104/pp.87.2.384" @default.
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