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• W2051219136 abstract "Four major esterases in one susceptible (CSMA) and two resistant (Hirokawa, E1) house fly strains were separated by chromatofocusing. Of the four esterases, those with pI's of 5.1 and 5.3 accounted for 90% of the p-nitrophenyl butyrate hydrolyzing activity in the three house fly strains. They also accounted for 70% (Hirokawa, E1) and 40% (CSMA) of the paraoxon-hydrolyzing activity as well as 87% (Hirokawa), 39% (E1) and 66% (CSMA) of the malathion-hydrolyzing activity in microsomes as measured by esterase-antibody interaction. In the Hirokawa strain, the pI 5.1 esterase was the predominant esterase and was more active than that of the the CSMA strain. Different substrate specificities and a different Km toward acetylthiocholine, as well as different rates of malathion and paraoxon hydrolysis between the Hirokawa and CSMA strains, suggest a qualitative difference in the pI 5.1 esterase. For the pI 5.1 esterase from the E1 strain, a different substrate specificity, a different Km for p-nitrophenyl butyrate, a different sensitivity to inhibitors, and a different rate of paraoxon hydrolysis suggest that it is a modified esterase. This esterase is not a phosphorotriester hydrolase, nor does it lack nonspecific esterase activity. It is a modified esterase which has a different substrate specificity when compared to the esterases from the other strains. The molecular weight of the esterases studied was approximately 220,000, with pH optima of about 7.0. The ratio of malathion α-monoacid to β-monoacid formation was about 9.0 for the pI 5.1 and 5.3 esterases and 1.5 for the pI 4.8 and 5.6 esterases. The existence of a higher αβ ratio for the pI 5.1 and 5.3 esterases and their significant rate of malathion hydrolysis in the Hirokawa strain indicate that an increase in the αβ ratio in house flies reported was due to the increase in the pI 5.1 esterase in the resistant strain." @default.
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• W2051219136 date "1985-04-01" @default.
• W2051219136 modified "2023-09-25" @default.
• W2051219136 title "The purification and characterization of esterases from insecticide-resistant and susceptible house flies" @default.
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• W2051219136 doi "https://doi.org/10.1016/0048-3575(85)90010-0" @default.
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