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Xu JJ, Chang YM, Lu M, Tie Y, Dong YL, Chen GY, Ma ZQ, Liu XL, Li YQ. Two single mutations in carboxylesterase 001C improve fenvalerate hydrolase activity in Helicoverpa armigera. Pestic Biochem Physiol 2021; 179:104969. [PMID: 34802519 DOI: 10.1016/j.pestbp.2021.104969] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 09/17/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Carboxylesterases (CarEs) usually play critical roles in the detoxification of toxic chemicals and therefore may be involved in insecticide resistance in agricultural pests. Previous work has shown that CarE 001C from Helicoverpa armigera was able to metabolize the isomers of cypermethrin and fenvalerate. In this study, seven mutants of CarE 001C with single amino acid substitution were produced and expressed in the Escherichia coli. Enzyme kinetic analysis indicated that all seven mutations dramatically reduced enzymatic activities toward the generic substrate α-naphthyl acetate, but in vitro metabolism assay showed that two of the mutations, H423I and R322L, significantly improved hydrolase activities toward fenvalerate, with their recorded specific activities being 3.5 and 5.1 nM·s-1·mg -1 proteins, respectively. Further, thermostability assay showed that the stability of one mutant enzyme was enhanced. This study will help us better understand the potential of CarEs in insecticide detoxification and resistance in H. armigera.
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Affiliation(s)
- Jing-Jing Xu
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Yong-Mei Chang
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Mei Lu
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; Engineering and Research Center of Biological Pesticide of Shaanxi Province,Yangling 712100, Shaanxi, China
| | - Yuan Tie
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Yan-Ling Dong
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Guang-You Chen
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; Engineering and Research Center of Biological Pesticide of Shaanxi Province,Yangling 712100, Shaanxi, China
| | - Zhi-Qing Ma
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China; Engineering and Research Center of Biological Pesticide of Shaanxi Province,Yangling 712100, Shaanxi, China
| | - Xi-Li Liu
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Yong-Qiang Li
- College of Plant Protection, Northwest A&F University, Yangling 712100, Shaanxi, China; State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712100, Shaanxi, China; Engineering and Research Center of Biological Pesticide of Shaanxi Province,Yangling 712100, Shaanxi, China.
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