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Ihara M, Tanaka K, Kai K, Hayashi H, Matsuda K. Competitive chrodrimanin B interactions with rat brain GABA A receptors revealed by radioligand binding assays. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2022; 183:105074. [PMID: 35430068 DOI: 10.1016/j.pestbp.2022.105074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 02/25/2022] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
Meroterpenoid compounds chrodrimanins produced by Talaromyces sp. YO-2 have been shown to act as competitive antagonists of silkworm larval GABAA receptors using electrophysiology, yet no further evidence has been provided to support such an action. We have investigated the actions of chrodrimanin B on rat brain GABAA receptors by binding assays with non-competitive ligand of GABAA receptors [3H]EBOB and competitive ligands [3H]gabazine and [3H]muscimol. Chrodrimanin B did not significantly affect the binding of [3H]EBOB while reducing the binding of [3H]gabazine and [3H]muscimol to the rat membrane preparations. Chrodrimanin B increased the dissociation constant Kd of [3H]gabazine and [3H]muscimol without significantly affecting the maximum binding, pointing to competitive interactions of chrodrimanin B with rat GABAA receptors in support of our previous observation that the compound acts as a competitive antagonist on the silkworm larval GABA receptor.
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Affiliation(s)
- Makoto Ihara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Keiji Tanaka
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University 3327-204 Nakamachi, Nara 631-8505, Japan
| | - Kenji Kai
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Hideo Hayashi
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan
| | - Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University 3327-204 Nakamachi, Nara 631-8505, Japan; Agricultural Technology and Innovation Research Institute, Kindai University, 3327-204 Nakamachi, Nara 631-8505, Japan.
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Yin X, Yang GF, Niu DB, Chen J, Liao M, Cao HQ, Sheng CW. Identification and pharmacological characterization of histamine-gated chloride channels in the fall armyworm, Spodoptera frugiperda. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2022; 140:103698. [PMID: 34848284 DOI: 10.1016/j.ibmb.2021.103698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/15/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
Histamine-gated chloride channels (HACls) mediate fast inhibitory neurotransmission in invertebrate nervous systems and have important roles in light reception, color processing, temperature preference and light-dark cycle. The fall armyworm, Spodoptera frugiperda is a main destructive pest of grain and row crops. However, the pharmacological characterization of HACls in S. frugiperda remain unknown. In this study, we identified two cDNAs encoding SfHACl1 and SfHACl2 in S. frugiperda. They had similar expression patterns and were most abundantly expressed in the head of larvae and at the egg stage. Electrophysiological analysis with the two-electrode voltage clamp method showed that histamine (HA) and γ-aminobutyric acid (GABA) activated inward currents when SfHACls were singly or collectively expressed with different ratios in Xenopus laevis oocytes. These channels were ≥2000-fold more sensitive to HA than to GABA. They were anion-selective channels, which were highly dependent on changes in external chloride concentrations, but insensitive to changes in external sodium concentrations. The insecticides abamectin (ABM) and emamectin benzoate (EB) also activated these channels with the EC50 to SfHACl1 lower than that to SfHACl2. And the EC50s of ABM and EB to the co-expressed channels gradually increased with increase in the injection ratio of SfHACl2 cRNA. Homology models and docking simulations revealed that HA bound to the large amino-terminal extracellular domain of SfHACl1 and SfHACl2 by forming 4 and 2 hydrogen bonds, respectively. The docking simulations of ABM and EB had similar binding sites in the transmembrane regions. Overall, these findings indicated that HACls act as targets for macrolide, and this study provides theoretical guidance for further derivatization of abamectin insecticides.
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Affiliation(s)
- Xue Yin
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China
| | - Guo-Feng Yang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China
| | - Duo-Bang Niu
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China
| | - Jiao Chen
- Affiliated Hospital of Integrated Traditional Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, 210028, PR China
| | - Min Liao
- Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China
| | - Hai-Qun Cao
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China.
| | - Cheng-Wang Sheng
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China; Anhui Province Engineering Laboratory for Green Pesticide Development and Application, School of Plant Protection, Anhui Agricultural University, Hefei, 230036, PR China.
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Kobayashi T, Hiragaki S, Suzuki T, Ochiai N, Canlas LJ, Tufail M, Hayashi N, Mohamed AAM, Dekeyser MA, Matsuda K, Takeda M. A unique primary structure of RDL (resistant to dieldrin) confers resistance to GABA-gated chloride channel blockers in the two-spotted spider mite Tetranychus urticae Koch. J Neurochem 2020; 155:508-521. [PMID: 32895930 DOI: 10.1111/jnc.15179] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 07/13/2020] [Accepted: 08/19/2020] [Indexed: 11/30/2022]
Abstract
The primary structure of the second transmembrane (M2) segment of resistant to dieldrin (RDL), an ionotropic γ-aminobutyric acid receptor (GABAR) subunit, and the structure-function relationships in RDL are well conserved among insect species. An amino acid substitution at the 2' position in the M2 segment (Ala to Ser or Gly) confers resistance to non-competitive antagonists (NCAs) of GABARs. Here, a cDNA encoding RDL was cloned from the two-spotted spider mite Tetranychus urticae Koch. Unlike insect homologs, native TuRDL has His at the 2' position (H305) and Ile at 6' (I309) in the M2 segment and is insensitive to NCAs. Single and multiple mutations were introduced in the M2 segment of TuRDL, and the mutant proteins were expressed in Xenopus oocytes and examined for the restoration of sensitivity to NCAs. The sensitivity of a double mutant (H305A and I309T in the M2 segment) was greatly increased but was still considerably lower than that of insect RDLs. We therefore constructed chimeric RDLs consisting of TuRDL and Drosophila melanogaster RDL and examined their sensitivities to NCAs. The results show that the N-terminal region containing the Cys-loop as well as the M2 segment confers functional specificity; thus, our current understanding of the mechanism underlying NCA binding to GABARs requires reappraisal.
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Affiliation(s)
- Takeru Kobayashi
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Susumu Hiragaki
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Takeshi Suzuki
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Noriaki Ochiai
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Liza J Canlas
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Muhammad Tufail
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Naotaka Hayashi
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | - Ahmed A M Mohamed
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
| | | | - Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, Nara, Japan.,Agricultural Technology and Innovation Research Institute, Kindai University, Nara, Japan
| | - Makio Takeda
- Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, Japan
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Shimada S, Kamiya M, Shigetou S, Tomiyama K, Komori Y, Magara L, Ihara M, Matsuda K. The mechanism of loop C-neonicotinoid interactions at insect nicotinic acetylcholine receptor α1 subunit predicts resistance emergence in pests. Sci Rep 2020; 10:7529. [PMID: 32371996 PMCID: PMC7200709 DOI: 10.1038/s41598-020-64258-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 03/23/2020] [Indexed: 11/12/2022] Open
Abstract
Neonicotinoids selectively modulate insect nicotinic acetylcholine receptors (insect nAChRs). Studies have shown that serine with ability to form a hydrogen bond in loop C of some insect nAChR α subunits and glutamate with a negative charge at the corresponding position in vertebrate nAChRs may contribute to enhancing and reducing the neonicotinoid actions, respectively. However, there is no clear evidence what loop C properties underpin the target site actions of neonicotinoids. Thus, we have investigated the effects of S221A and S221Q mutations in loop C of the Drosophila melanogaster Dα1 subunit on the agonist activity of imidacloprid and thiacloprid for Dα1/chicken β2 nAChRs expressed in Xenopus laevis oocytes. The S221A mutation hardly affected either the affinity or efficacy for ACh and imidacloprid, whereas it only slightly reduced the efficacy for thiacloprid on the nAChRs with a higher composition ratio of β2 to Dα1 subunits. The S221Q mutation markedly reduced the efficacy of the neonicotinoids for the nAChRs with a higher composition of the β2 subunit lacking basic residues critical for binding neonicotinoids. Hence, we predict the possibility of enhanced neonicotinoid resistance in pest insect species by a mutation of the serine when it occurs in the R81T resistant populations lacking the basic residue in loop D of the β1 subunit.
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Affiliation(s)
- Shota Shimada
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Masaki Kamiya
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Sho Shigetou
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Kakeru Tomiyama
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Yuma Komori
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Leo Magara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Makoto Ihara
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan
| | - Kazuhiko Matsuda
- Department of Applied Biological Chemistry, Faculty of Agriculture, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan. .,Agricultural Technology and Innovation Research Institute, Kindai University, 3327-204 Nakamachi, Nara, 631-8505, Japan.
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