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- ArticleOgunyemi EO, Pittner F, Hoffmann-Ostenhof O.Hoppe Seylers Z Physiol Chem. 1978 May;359(5):613-6.Using the technique of affinity chromatography on NAD-Sepharose the myo-inositol-1-phosphate synthase of Lemna gibba was purified to homogeneity. The molecular and catalytic properties of this enzyme differ very much from those of myo-inositol-1-phosphate synthase from animal sources. Thus the specific activity of the duckweed enzyme is more than two orders of magnitude higher than that of the enzyme from rat testes. It is inhibitied by EDTA and can be reactivated by Mn2. Its molecular weight (135000 +/- 5000), its subunit composition (3 subunits with identical electrophoretic behaviour) and its isoelectric point (pH 7.7) are also very different from the corresponding parameters for the animal enzyme.