Amine Oxidase from Lentil Seedlings: Energetic Domains and Effect of Temperature on Activity |
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Authors: | S Zahra Moosavi-Nejad Mostafa Rezaei-Tavirani Alessandra Padiglia Giovanni Floris and Ali-Akbar Moosavi-Movahedi |
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Institution: | (1) Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran;(2) Faculty of Medicin, Ilam Medical University, Ilam, Iran;(3) Department of Sciences Applied to Biosystems, University of Cagliari, Cagliari, Italy |
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Abstract: | Copper/TPQ amine oxidases from mammalian and plant sources have shown many differences in substrate specificity and molecular properties. In this work the activity of lentil seedling amine oxidase was followed at various temperatures in 100 mM potassium phosphate buffer, pH 7, using benzylamine as substrate. The discontinuous Arrhenius plot of lentil amine oxidase showed two distinct phases with a jump between them. Thermal denaturation of the enzyme, using differential scanning calorimetry under the same experimental conditions, showed a transition at the same temperature ranges in the absence of substrate, indicating the occurrence of conformational changes, with an enthalpy change of about 175.9 kJ/mole. The temperature-induced changes of the activity of lentil amine oxidase are compared with those of bovine serum amine oxidase (taken from the literature). |
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Keywords: | Copper-containing amine oxidase lentil seedling differential scanning calorimetry amine oxidases comparison |
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