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1. Ornithine-2-oxo acid aminotransferase activity was inhibited by amino-oxyacetate (10(-5) M). This permitted the measurement of ornithine decarboxylase in the presence of mitochondria by using the 14CO2-trapping technique. 2. Subcellular fractionation of rat liver by differential centrifugation, followed by the assay of ornithine decarboxylase in the presence of amino oxyacetate and of marker enzymes for each fraction, demonstrated that ornithine decarboxylase was located in the cytosol. 3. The greatly increased ornithine decarboxylase activity observed after growth-hormone administration was also found to be localized in the cytosol. 4. The Km of ornithine decarboxylase from rat liver for ornithine was 28 muM. Administration of growth hormone 4 h before death did not affect the apparent affinity of ornithine decarboxylase for ornithine.

Subcellular localization of ornithine decarboxylase in liver of control and growth-hormone-treated rats