title: [Substrate specificity of brain cholinesterase activity of evolutionary old species of fishes].
abstract: An analysis of brain cholinesterase properties in 3 species of cartilaginous fishes and 1 species of chondrostei, was conducted for the first time. The skates brain enzymes, as to substrate specificity, are shown to be referred to acetylcholinesterases, and the shark brain cholinesterase - to atypical acetylcholinesterase. Kaluga brain cholinesterase, as to its substrate specificity, differes from brain enzymes of cartilaginous fishes. The differences in properties of the nervous tissue cholinestarase of the investigated fish species are the parameters of evolutionary divergence of species.
authors.forename: N N
authors.initials: NN
authors.lastname: Kovalev
authors.forename: E V
authors.initials: EV
authors.lastname: Mikheev
mesh_terms: D000110:Acetylcholinesterase / Q000378:metabolism*; D000818:Animals; D005075:Biological Evolution; D001921:Brain / Q000201:enzymology*; D005399:Fishes / Q000254:growth & development / Q000378:metabolism*; D013379:Substrate Specificity
chemical_list: D000110:Acetylcholinesterase