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AaIT: from neurotoxin to insecticide.

E Zlotkin1, Y Fishman, M Elazar

  • 1Department of Animal and Cell Biology, Institute of Life Sciences, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel. zlotkin@vms.huji.ac.il

Biochimie
|November 22, 2000
PubMed
Summary

Androctonus australis Hector insect toxin (AaIT) selectively targets insect sodium channels, causing paralysis. Genetically engineered baculoviruses expressing AaIT offer potent bio-insecticides and a strategy for managing insecticide resistance.

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Area of Science:

  • * Neuroscience
  • * Toxicology
  • * Biotechnology

Background:

  • * AaIT is a neurotoxic polypeptide from scorpion venom, selective for insects.
  • * It binds to insect neuronal membranes with high affinity.
  • * AaIT induces rapid paralysis by affecting insect motor nerve activity.

Purpose of the Study:

  • * To investigate the mechanism of AaIT-induced insect paralysis.
  • * To explore the agrotechnical applications of AaIT in bio-insecticides.
  • * To assess AaIT's role in insecticide resistance management.

Main Methods:

  • * Toxicity, electrophysiological, and ligand receptor binding assays.
  • * Analysis of AaIT's effect on insect voltage-dependent sodium channels.

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  • * Development of recombinant baculoviruses expressing AaIT.

    • Main Results:

    • * AaIT specifically perturbs insect sodium conductance by binding to voltage-dependent sodium channels.
    • * This binding modifies the channel's gating mechanism, leading to repetitive neuronal firing.
    • * Recombinant baculoviruses expressing AaIT demonstrate potent insecticidal activity.
    • * AaIT can overcome insecticide resistance mechanisms like KDR.

    Conclusions:

    • * AaIT is a valuable tool for studying insect neuronal excitability and chemical ecology.
    • * Genetically engineered baculoviruses expressing AaIT represent effective and selective bio-insecticides.
    • * AaIT offers a novel strategy for managing insecticide resistance in agriculture.