Discovery of an Insect Neuroactive Helix Ring Peptide from Ant Venom

Area of Science:

• Biochemistry
• Pharmacology
• Entomology

Background:

• Ants are abundant predators utilizing paralytic venom to subdue prey.
• Ant venoms are complex toxin mixtures with potential for novel insecticide discovery.
• Previous research has identified various peptides in ant venom.

Purpose of the Study:

• To identify and characterize insect-neurotoxins from ant venoms.
• To evaluate the insecticidal and pharmacological properties of ant venom peptides.
• To explore ant venom as a source for novel insecticidal compounds.

Main Methods:

• Screening of nine synthetic peptides from *Tetramorium bicarinatum* venom for paralytic activity on blowflies.
• Insecticidal assays, Nuclear Magnetic Resonance (NMR) spectroscopy, and pharmacological assays on peptide U11.
• Testing U11's effects on blowflies, honeybees, and *Drosophila* S2 cells.

Main Results:

• Peptide U11 demonstrated potent paralytic activity against blowflies and honeybees.
• NMR analysis revealed U11 possesses a unique triangular ring helix structure stabilized by a disulfide bond.
• U11 was found to be non-cytotoxic to *Drosophila* S2 cells and may modulate potassium channels.

Conclusions:

• Ant venom is a rich reservoir for discovering neuroactive insecticidal peptides.
• Peptide U11 represents a highly effective insect neurotoxin with potential applications.
• Further pharmacological studies are warranted to fully elucidate U11's mechanism of action.