ArticleFish physiology and biochemistry2014
Characterization of catalytic efficiency parameters of brain cholinesterases in tropical fish.
Article in Fish physiology and biochemistry, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Physiology and comparative transcriptomic analyses reveal the effects of food enrichment on the brain of yellow drum Nibea albiflora (Richardson, 1846).Fish physiology and biochemistry · 2026Article
- Alternations in the liver metabolome, skin and serum antioxidant function of silver pomfret (3 Biotech · 2021Article
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9 authors.
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Abstract
Brain cholinesterases from four fish (Arapaima gigas, Colossoma macropomum, Rachycentron canadum and Oreochromis niloticus) were characterized using specific substrates and selective inhibitors. Parameters of catalytic efficiency such as activation energy (AE), k(cat) and k(cat)/k(m) as well as rate enhancements produced by these enzymes were estimated by a method using crude extracts described here. Despite the BChE-like activity, specific substrate kinetic analysis pointed to the existence of only acetylcholinesterase (AChE) in brain of the species studied. Selective inhibition suggests that C. macropomum brain AChE presents atypical activity regarding its behavior in the presence of selective inhibitors. AE data showed that the enzymes increased the rate of reactions up to 10(12) in relation to the uncatalyzed reactions. Zymograms showed the presence of AChE isoforms with molecular weights ranging from 202 to 299 kDa. Values of k(cat) and k(cat)/k(m) were similar to those found in the literature.
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