Comparative study of substrate and inhibitory specificity of monoamine oxidase of squid optic ganglia

  • O. V. Yagodina
Comparative and Ontogenic Biochemistry
  • 36 Downloads

Abstract

Comparative study of substrate specificity of monoamine oxidase (MAO) of optic ganglia of the Pacific squid Todarodes pacificus and the Commander squid Berryteuthis magister has been carried out. The enzyme of the Pacific squid, unlike that of the Commander squid, has been established to be able to deaminate not only tyramine, tryptamine, serotonin, benzylamine, and β-phenylethylamine, but also histamine-substrate of diamine oxidase (DAO). In relation to all studied substrates, the MAO activity of optic ganglia of T. pacificus is several times higher as compared with that of B. magister. In the case of deamination of serotonin this difference was the highest and amounted to 5 times. Semicarbazide, the classic DAO inhibitor, at a concentration of 10 mM did not inhibit catalytic activity of both studied enzymes. The substrate-inhibitory analysis with use of deprenyl and clorgyline, specific inhibitors of different MAO forms, indicates homogeneity of the enzyme of the Pacific squid and heterogeneity of the Commander squid enzyme whose composition seems to contain at least two MAO forms. There are obtained quantitative differences in substrate specificity and reaction capability with respect to the inhibitors clorgylin and deprenyl for MAO of optic ganglia of the studied squid species. These differences probably can be explained by significant differences in the evolutionary level of these biological species.

Key words

evolution monoamine oxidase monoamines squids 

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© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • O. V. Yagodina
    • 1
  1. 1.Sechenov Institute of Evolutionary Physiology and BiochemistryRussian Academy of SciencesSt. PetersburgRussia

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