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Two types of housefly acetylcholinesterases (AChEs) were expressed in a baculovirus lepidopteran cell system to elucidate the effect of point mutations from Ile162, Gly342 and Phe407 in the organophosphate susceptible strains to Met162, Ala342 and Tnyr407 in the organophosphate resistant strains. Concentrations resulting in 50% inhibition (I50) of the expressed enzyme by an organophosphate, fenitroxon, with Ile162, Gly342 and Phe407 was 4.02×10−7 M, and that of the AChE with Met162, Ala342 and Tyr407 was 9.00×10−6 M. The ratio of I50 values was 22.4, and was almost equivalent to the ratio of the inhibition assay of homogenates of housefly bodies from which the cDNAs encoding the housefly AChEs were derived. The insensitivity of the housefly AChE to fenitroxon in the insecticide resistant strains is attributed to point mutations in the structural gene.

applied entomology and zoology

Expression of two acetylcholinesterase genes from organophosphate sensitive- and insensitive-houseflies, Musca domestica L.(Diptera: Muscidae), using a baculovirus insect cell system.