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Functional Characteristics of the Lepidopteran Ionotropic GABA Receptor 8916 Subunit Interacting with the LCCH3 or the RDL Subunit

文献类型： 外文期刊

作者： Huang, Qiu Tang 1 ; Sheng, Cheng Wang 1 ; Jones, Andrew K. 3 ; Jiang, Jie 1 ; Tang, Tao 4 ; Han, Zhao Jun 1 ; Zhao, Ch 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Nanjing 210095, Peoples R China

2.Anhui Agr Univ, Sch Plant Protect, Anhui Prov Key Lab Integrated Pest Management Cro, Hefei 230036, Peoples R China

3.Oxford Brookes Univ, Dept Biol & Med Sci, Oxford OX3 0BP, England

4.Hunan Acad Agr Sci, Inst Plant Protect, Changsha 410125, Peoples R China

关键词： Chilo suppressalis; Xenopus oocyte; 8916; GABA receptor; insecticide

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）

ISSN： 0021-8561

年卷期： 2021 年 69 卷 39 期

页码：

收录情况： SCI

摘要： The ionotropic gamma-aminobutyric acid (iGABA) receptor is commonly considered as a fast inhibitory channel and is an important insecticide target. Since 1990, RDL, LCCH3, and GRD have been successively isolated and found to be potential subunits of the insect iGABA receptor. More recently, one orphan gene named 8916 was found and considered to be another potential iGABA receptor subunit according to its amino acid sequence. However, little information about 8916 has been reported. Here, the 8916 subunit from Chilo suppressalis was studied to determine whether it can form part of a functional iGABA receptor by coexpressing this subunit with CsRDL1 or CsLCCH3 in the Xenopus oocyte system. Cs8916 or CsLCCH3 did not form functional ion channels when expressed alone. However, Cs8916 was able to form heteromeric ion channels when expressed with either CsLCCH3 or CsRDL1. The recombinant heteromeric Cs8916/LCCH3 channel was a cation-selective channel, which was sensitive to GABA or beta-alanine. The current of the Cs8916/LCCH3 channel was inhibited by dieldrin, endosulfan, fipronil, or ethiprole. In contrast, fluralaner, broflanilide, and avermectin showed little effect on the Cs8916/LCCH3 channel (IC(50)s > 10 000 nM). The Cs8916/ RDL1 channel was sensitive to GABA, but was significantly different in EC50 and I-max for GABA to those of homomeric CsRDL1. Fluralaner, fipronil, or dieldrin showed antagonistic actions on Cs8916/RDL1. In conclusion, Cs8916 is a potential iGABA receptor subunit, which can interact with CsLCCH3 to generate a cation-selective channel that is sensitive to several insecticides. Also, as Cs8916/RDL1 has a higher EC50 than homomeric CsRDL1, Cs8916 may affect the physiological functions of CsRDL1 and therefore play a role in fine-tuning GABAergic signaling.

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