title: Molecular characterization and inhibition analysis of the acetylcholinesterase gene from the silkworm maggot, Exorista sorbillans.
abstract: Several organophosphorus (OP) insecticides can selectively kill the silkworm maggot, Exorista sorbillans (Es) (Diptera: Tachinidae), while not obviously affecting the host (Bombyx mori) larvae, but the mechanism is not yet clear. In this study, the cDNA encoding an acetylcholinesterase (AChE) from the field Es was isolated. One point mutation (Gly353Ala) was identified. The Es-353G AChE and Es-353A AChE were expressed in baculovirus- insect cell system, respectively. The inhibition results showed that for eserine and Chlorpyrifos, Es-353A AChE was significantly less sensitive than Es-353G AChE. Meanwhile, comparison of the I(50) values of eserine, dichlorvos, Chlorpyrifos and omethoate of recombinant Es AChEs with its host (Bombyx mori) AChEs indicated that, both Es AChEs are more sensitive than B. mori AChEs. The results give an insight of the mechanism that some OP insecticides can selectively kills Es while without distinct effect on its host, B. mori.
authors.affiliation: Ministry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and Insects, and Institute of Insect Science, Zhejiang University, Hangzhou 310029, China.
authors.forename: Guo-Jun
authors.initials: GJ
authors.lastname: Lang
authors.forename: Ming-Yan
authors.initials: MY
authors.lastname: Zhang
authors.forename: Bao-Ling
authors.initials: BL
authors.lastname: Li
authors.forename: Lin-Lin
authors.initials: LL
authors.lastname: Yu
authors.forename: Xing-Meng
authors.initials: XM
authors.lastname: Lu
authors.forename: Chuan-Xi
authors.initials: CX
authors.lastname: Zhang
mesh_terms: D000110:Acetylcholinesterase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000818:Animals; D012831:Bombyx / Q000469:parasitology; D002800:Cholinesterase Inhibitors / Q000494:pharmacology; D004175:Diptera / Q000201:enzymology*; D007306:Insecticides / Q000737:chemistry; D008969:Molecular Sequence Data; D017354:Point Mutation; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D002800:Cholinesterase Inhibitors; D007306:Insecticides; D011994:Recombinant Proteins; D000110:Acetylcholinesterase