Author： Rozengart E. Basova N.
Publisher： MAIK Nauka/Interperiodica
ISSN： 0022-0930
Source： Journal of Evolutionary Biochemistry and Physiology, Vol.41, Iss.6, 2005-11, pp. : 610-622
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Abstract
Classification and evaluation is performed of comparative enzymologic parameters of cholinesterase activity (ChEA) in the optic ganglia tissue of individuals of different squid species with different habitats, the parameters used in the biochemical method of Cephalopoda taxonomy. Seven species of oceanic squids belonging to three families, Ommastrephidae (subfamilies Ommastrephinae and Todaradinae), Thysanoteuthidae and Gonatidae, are studied. As cholinesterase effectors, 8 substrates, 8 irreversible organophosphorus inhibitors, and 17 reversible onium inhibitors are tested. Different levels of comparison of the enzymologic parameters of ChEA are proposed. First, the enzymatic homogeneity or heterogeneity of ChEA is a criterion of interspecies difference. Second, the interspecies differences may be evaluated from parameters of the ChEA substrate specificity in different squid species. Third, use of irreversible organophosphorus inhibitors is the test that is essentially simpler, sufficiently sensitive, and reliable for comparison in the enzymologic method. Fourth, the finer nuances of the taxonomy at the level of intraspecies differences can be revealed by using reversible onium inhibitors of different structure. The enzymologic method of the squid taxonomy has allowed revealing isolation of populations of
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