Quantitative and qualitative changes of the carboxylesterase associated with beta-cypermethrin resistance in the housefly, Musca domestica (Diptera: Muscidae)
文献类型: 外文期刊
第一作者: Shi, Jing
作者: Shi, Jing;Shi, Xueyan;Liang, Pei;Gao, Xiwu;Gao, Junping;Zhang, Lan
作者机构:
关键词: Musca domestica;Pyrethroid resistance;Carboxylesterase;Amino acid substitution;Gene over-expression
期刊名称:COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY ( 影响因子:2.231; 五年影响因子:2.215 )
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收录情况: SCI
摘要: Mechanisms of esterase-mediated pyrethroid resistance were analyzed based on our previous works in a strain of the housefly, Musca domestica. The carboxylesterase gene, MdαE7, was cloned and sequenced from susceptible (CSS) and resistant (CRR) strains, and a total of nine amino acid substitutions were found. The mutation, Trp251-Ser appeared to play a role in beta-cypermethrin resistance and cross-resistance between organophosphates (OPs) and pyrethroids in the CRR strain. Quantitative real-time PCR showed that MdαE7 was over-expressed in the CRR strain, the reciprocal cross progeny F1 and back-cross progeny BC2 compared with the CSS strain, respectively. Two α-cynaoester substrates as surrogates for beta-cypermethrin and deltamethrin, were synthesized to determine the pyrethroid hydrolase activity. Results showed that carboxylesterases from the CRR strain hydrolyzed cypermethrin/deltamethrin-like substrate 9.05- and 13.53-fold more efficiently than those from the CSS strain, respectively. Our studies suggested that quantitative and qualitative changes in the carboxylesterase might contribute together to pyrethroid resistance in the CRR strain.
分类号: Q5
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