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Voltage-gated sodium channels as targets for pyrethroid insecticides
Linda M Field1, T G Emyr Davies2, Andrias O O'Reilly3
1Rothamsted Research, Herts, Harpenden, AL5 2JQ, UK. lin.field@rothamsted.ac.uk.
European Biophysics Journal : EBJ
|January 11, 2017
Summary
Pyrethroid insecticides control pests but cause resistance. Understanding their interaction with sodium channels reveals insect selectivity and aids in designing new insecticides.
Area of Science:
- Insect toxicology
- Molecular biology
- Neuroscience
Background:
- Pyrethroid insecticides are widely used for pest and disease vector control.
- Widespread use has led to the evolution of resistance in many arthropod species.
- Pyrethroids target voltage-gated sodium channels (VGSCs) as their mode of action.
Purpose of the Study:
- To elucidate the mode of action of pyrethroids.
- To understand the molecular basis of pyrethroid resistance.
- To investigate the basis of selectivity between insects, mammals, and other arthropods.
Main Methods:
- Studying amino acid substitutions in VGSCs that confer resistance.
- Molecular modeling of channel/pyrethroid interactions.
- Expressing mutant channels in oocytes for functional analysis.
Main Results:
- Resistance-associated amino acid substitutions alter pyrethroid binding to VGSCs.
- Insights into the functional mechanisms of VGSCs.
- Understanding the structural determinants of pyrethroid selectivity.
Conclusions:
- Elucidating pyrethroid mode of action and resistance mechanisms.
- Identifying key structural features for insect versus mammalian selectivity.
- Informing the design of novel insecticides with improved species selectivity.
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