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Phosphoenolpyruvate carboxykinase of kidney. Subcellular distribution and response to acid-base changes.

1. A method for the assay of phosphoenolpyruvate carboxykinase is presented, based on the enzymic determination of the phosphoenolpyruvate produced by the enzyme reaction. 2. The subcellular distribution of phosphoenolpyruvate carboxykinase in the kidney of several animal species resembled the distribution in the liver. 3. The rise in enzyme activity in the kidney cortex of rats made acidotic by feeding with ammonium chloride was not prevented by administration of ethionine or actinomycin. 4. The possibility is suggested that in the kidney acidosis causes activation of an inactive form of the enzyme already present.