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COMPARATIVE STUDY
JOURNAL ARTICLE
Inhibition effects of pesticides on glutathione-S-transferase enzyme activity of Van Lake fish liver.
Journal of Biochemical and Molecular Toxicology 2018 September
Glutathione-S-transferases (GSTs) have a function in xenobiotic metabolism. They are a significant multifunctional family with a wide variety of catalytic activities. In the current study, we determined in vitro inhibition effects of 2,4-dichlorophenoxyacetic acid dimethylamine salt (2,4-D DMA), haloxyfop-P-methyl, glyphosate isopropylamine, dichlorvos, and λ-cyhalothrin on purified GST. For this purpose, GST were purified from Van Lake fish (Chalcalburnus tarichii Pallas) liver with 29.25 EU mg-1 specific activity and 10.76% yield using GSH-agarose affinity chromatographic method. The pesticides were tested at various concentrations on in vitro GST activity. Ki constants were calculated as 0.17 ± 0.01, 0.25 ± 0.05, 3.72 ± 0.32, 0.42 ± 0.06, and 0.025 ± 0.004 mM, for 2,4-D DMA, haloxyfop-P-methyl, glyphosate isopropylamine, dichlorvos, and λ-cyhalothrin, respectively. λ-Cyhalothrin showed a better inhibitory effect compared to the other pesticides. The inhibition mechanisms of λ-cyhalothrin were competitive, while the other pesticides were noncompetitive.
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