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Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
Published on: April 21, 2018
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Venom toxicity and composition in three Pseudomyrmex ant species having different nesting modes
Axel Touchard1, Nicolas Labrière1, Olivier Roux2
1CNRS, UMR Ecologie des Forêts de Guyane (EcoFoG), Campus Agronomique, BP 316, 97379 Kourou Cedex, France.
Summary
Ant nesting habits did not affect venom efficacy, but influenced composition. Ground-dwelling ants have more linear peptides, while arboreal ants possess disulfide-bonded peptides, reflecting diverse ecological pressures.
Area of Science:
- Insect toxicology
- Evolutionary biology
- Biochemistry
Background:
- Ant venom composition and toxicity can be influenced by ecological factors.
- The genus Pseudomyrmex offers a model system with terrestrial, arboreal, and plant-ant species.
Purpose of the Study:
- To investigate the relationship between nesting habits and venom toxicity/composition in Pseudomyrmex ants.
- To compare venom efficacy and lethal potency across different ecological niches.
Main Methods:
- Ant species were selected based on nesting habits: terrestrial (P. termitarius), arboreal (P. gracilis), and plant-ant (P. penetrator).
- Venom paralyzing efficacy and lethal potency were assessed.
- High-performance liquid chromatography (HPLC) and MALDI-TOF mass spectrometry were used to analyze venom composition.
Main Results:
- Contrary to hypothesis, ground-dwelling P. termitarius venom showed similar paralyzing efficacy to arboreal species.
- P. termitarius venom was equipotent with P. gracilis but less potent than P. penetrator.
- P. termitarius venom contains 87 linear peptides; P. gracilis and P. penetrator venoms contain fewer peptides (23 and 26) with disulfide bonds, including dimeric peptides in P. penetrator.
Conclusions:
- Nesting habits do not directly correlate with venom paralyzing efficacy or lethal potency in Pseudomyrmex.
- Venom composition is shaped by ecological factors: P. termitarius venom's complexity may relate to diverse prey and antibacterial needs for ground nests.
- P. penetrator venom's structural diversity likely reflects adaptation to a complex arboreal environment with multiple predators and competitors.
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