Abstract
Study of substrate-inhibitory specificity of liver mitochondrial monoamine oxidase (MAO) of adult individuals of the whitefish Coregonus lavaretus ludoga P. from the Ladoga Lake has revealed distinguished peculiarities of catalytic properties of this enzyme. The studied MAO, on one hand, like the classical enzyme of homoiothermal animals, is able to deaminate tyramine, serotonin, benzylamine, tryptamine, and β-phenylalanine, but, on the other hand, to deaminate histamine, the classic substrate of diamine oxidase. The found equal activity and sorptional ability of the enzyme toward six studied substrates including histamine, as well as results of the substrate-inhibitory analysis with use of specific inhibitors-deprenyl and chlorgilin-indicate homogeneity of the enzyme. The detected for the first time among the fish MAO wide substrate specificity and an unusually low sensitivity to both studied acetylene inhibitors does not allow ascribing unanimously the studied enzyme to the MAO forms known in organs and tissues of homoiothermal organisms. Apparently, the revealed enzyme form of this poikilothermal organism is not the true MAO, but performs a large amine oxidase function.
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Original Russian Text © I. N. Basova, O. V. Yagodina, 2011, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2011, Vol. 47, No. 4, pp. 272–277.
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Basova, I.N., Yagodina, O.V. Catalytic characteristics of monoamine oxidase of whitefish Coregonus lavaretus ludoga . J Evol Biochem Phys 47, 321–327 (2011). https://doi.org/10.1134/S0022093011040025
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DOI: https://doi.org/10.1134/S0022093011040025