Enzymatic Characteristics and Metabolic Analysis to Malathion and p,p’-DDT of LmGSTS2 from Locusta migratoria
MA Wen1, LIU Jiao2, ZHANG XueYao2, SHEN GuoHua3, QIN XueMei,1, ZHANG JianQin,11 Modern Research Center For Traditional Chinese Medicine, Shanxi University, Taiyuan 030006 2 Institute of Applied Biology, Shanxi University, Taiyuan 030006 3 Shanxi Provincial Institute for Food and Drug Control, Taiyuan 030001
Abstract 【Objective】 Glutathione S-transferase sigma2 (LmGSTS2) from Locusta migratoria was expressed in Escherichia coli and purified in order to analyze the enzymatic characteristics. The objective of this research was to study the effect of LmGSTS2 on malathion and p,p’-DDT metabolism. The detoxification ability of LmGSTS2 was assessed by using LmGSTs2 RNA interference (RNAi) and insecticide bioassay. It will provide a theoretical basis for management of locust resistance and rational insecticide application.【Method】LmGSTS2 was expressed in BL21 (DE3) cells and purified by Ni-NTA affinity chromatography. The activities of LmGSTS2 under different conditions (temperature and pH) were detected using CDNB as substrate. Under the optimal conditions (pH 7, 27℃), malathion and p,p’-DDT were incubated with purified LmGSTS2 protein. The metabolic detoxification ability of LmGSTS2 to malathion and p,p’-DDT was evaluated by ultra performance liquid chromatography (UPLC). Furthermore, 3 μg of dsLmGSTs2 was injected into 2nd instar nymph, RNAi efficiency of LmGSTs2 was tested at 24 h after dsLmGSTs2 injection and the sensitivity of L. migratoria to malathion was analyzed at 24 h after malathion exposure. 【Result】 LmGSTs2 was induced to express in E. coli. After SDS-PAGE detection, it was found that an extra band around 25 kD in the total protein of pET28a/BL21 (DE3)-LmGSTS2 after induction compared with pET28a/BL21(DE3) and uninduced pET28a/BL21(DE3)-LmGSTS2, which is regarded as the target protein size, indicating that LmGSTS2 was successfully expressed in the bacteria. The results of the study on the enzymatic characteristics of the purified LmGSTS2 protein showed that the optimum reaction pH was 6-8, the enzyme activity reached the peak at pH=7, the optimum reaction temperature was 25-30℃, and the activity was the highest at 27℃. LmGSTS2 was exposed to malathion and p,p’-DDT respectively at pH 7, 27℃. The results of UPLC showed that the peak area of malathion after incubation with LmGSTS2 decreased by 83.6%, 84.0% and 84.6%, respectively, compared with GSH+insecticide, active LmGSTS2+insecticide and inactive LmGSTS2+GSH+insecticide (P<0.05). However, there was no significant change in the peak area of p,p’-DDT compared with the control group (P>0.05), indicating that LmGSTS2 could metabolize malathion, but had no effect on the metabolism of p,p’-DDT. The role of LmGSTS2 in the detoxification process of malathion was further verified by RNA interference. The dsRNA of the target gene was injected into the 2nd instar nymph. After 24 h, the mRNA expression of LmGSTs2 was inhibited by 96%. The sensitivity test showed that compared with the control group, the sensitivity of L. migratoria to malathion increased after gene silencing, and the mortality increased from 29.9% to 45.2%, indicating that LmGSTS2 was involved in the detoxification process of malathion in L. migratoria. 【Conclusion】 LmGSTS2 was expressed and purified in vitro, and the optimal reaction condition of the enzyme was pH=7, 27℃ using CDNB as substrate. In vivo and in vitro assays for malathion metabolism showed that LmGSTS2 was involved in the metabolic detoxification in L. migratoria. In vitro assay for p,p’-DDT metabolism showed that LmGSTS2 was not involved in the metabolism of p,p’-DDT. Keywords: Locusta migratoria;insecticide;glutathione-S-transferases;ultra performance liquid chromatography (UPLC);RNA interference (RNAi)
PDF (1008KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 马雯, 刘娇, 张学尧, 申国华, 秦雪梅, 张建琴. 飞蝗LmGSTS2的酶学特性及其对马拉硫磷、 p,p’-DDT的代谢分析[J]. 中国农业科学, 2019, 52(8): 1389-1399 doi:10.3864/j.issn.0578-1752.2019.08.009 MA Wen, LIU Jiao, ZHANG XueYao, SHEN GuoHua, QIN XueMei, ZHANG JianQin. Enzymatic Characteristics and Metabolic Analysis to Malathion and p,p’-DDT of LmGSTS2 from Locusta migratoria[J]. Scientia Acricultura Sinica, 2019, 52(8): 1389-1399 doi:10.3864/j.issn.0578-1752.2019.08.009
M:10—180 kD蛋白分子量标准 10-180 kD protein molecular weight standards。A:LmGSTS2的表达 Expression of LmGSTS2。1:BL21(DE3);2:pET28a/BL21(DE3);3:未诱导pET28a/BL21(DE3)-LmGSTS2 pET28a/BL21(DE3)-LmGSTS2 before induction;4:诱导后的pET28a/BL21(DE3)-LmGSTS2 pET28a/BL21(DE3)-LmGSTS2 after induction。B:LmGSTS2的纯化 Purification of LmGSTS2。 1:未纯化的LmGSTS2总蛋白Total protein of LmGSTS2 before purification;2:过柱穿透液 Flow through fraction;3—12:不同浓度咪唑缓冲液洗脱组分Elution components with different concentrations of imidazole buffer
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