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  • Title: Characterization of ornithine decarboxylase of tobacco cells and tomato ovaries.
    Author: Heimer YM, Mizrahi Y.
    Journal: Biochem J; 1982 Feb 01; 201(2):373-6. PubMed ID: 7082296.
    Abstract:
    Some characteristics of L-ornithine decarboxylase of tomato ovaries and tobacco cells are described. The enzyme has a pH optimum of 8.0. It requires pyridoxal phosphate and thiol reagent (dithiothreitol) for activity. It is specific for L-ornithine and has an apparent Km of 1.4 X 10-4 M. It has an apparent molecular weight of 107000. Putrescine inhibited the activity in vitro. Spermidine and spermine also inhibit the enzyme, but less effectively. It is concluded that the enzyme is similar to that of mammalian origin and likewise fulfils a function related to cell proliferation.
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