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Ornithine decarboxylase was purified at least 1500-fold from mouse epidermis pretreated with five consecutive doses of 12-O-tetradecanoylphorbol-13-acetate and 3-isobutyl-1-methylxanthine at 3- to 4-day intervals. Following DEAE-cellulose chromatography and ammonium sulfate precipitation, ornithine decarboxylase was purified further by affinity chromatography. Ornithine decarboxylase was then radioactively labeled by covalently binding [3H]-alpha-difluromethylornithine to the enzyme following polyacrylamide gel electrophoresis under non-denaturing conditions. Following sodium dodecyl sulfate polyacrylamide gel electrophoresis and silver staining of protein, a band was identified that corresponded to a molecular weight of approx. 56,000, coincident with a peak of radioactivity. This is the first study to purify ornithine decarboxylase from mouse epidermis.
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