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Anti-insect toxin 5 (AaIT5) from Androctonus australis
Y Nakagawa1, Y M Lee, E Lehmberg
1Department of Entomology, University of California, Davis 95616, USA.
European Journal of Biochemistry
|June 1, 1997
Summary
A novel insect-selective scorpion toxin, AaIT5, from Androctonus australis venom is highly lethal to tobacco budworm but safe for mice. Its sequence is similar to other insecticidal toxins.
Area of Science:
- Biochemistry
- Toxicology
- Entomology
Background:
- Scorpion venoms contain diverse toxins, some with potential applications in pest control.
- Insect-specific toxins are valuable for developing targeted pesticides with reduced environmental impact.
Purpose of the Study:
- To isolate and characterize a novel insect-selective scorpion toxin from Androctonus australis venom.
- To determine the amino acid sequence and assess the toxicity and specificity of the purified toxin.
Main Methods:
- Purification of the toxin (AaIT5) from Androctonus australis venom.
- Amino acid sequencing using automated Edman degradation and mass spectrometry.
- Toxicity assays on the tobacco budworm (Heliothis virescens) and mice.
Main Results:
- The insect-selective scorpion toxin (AaIT5) was successfully purified.
- AaIT5 demonstrated high potency against Heliothis virescens (100% lethal dose < 1.8 microg/100 mg body mass).
- The toxin exhibited distinct insect specificity and was non-toxic to mice via subcutaneous injection.
Conclusions:
- AaIT5 is a potent and specific insecticidal toxin with potential for agricultural applications.
- The molecular mass of AaIT5 is 6882 Da, and its sequence shows homology to other known insect-depressant toxins.