The worker ants apply their venom to the brood to prevent fungal infections.
Photo Credit: Lukas Koch
Scientific Frontline: Extended "At a Glance" Summary: Formicitoxins in Carpenter Ant Venom
The Core Concept: Researchers have identified 35 novel antimicrobial peptides, known as formicitoxins, within the venom of carpenter ants. These small protein molecules play a critical role in the management of microbes and the hygienic defense of insect communities.
Key Distinction/Mechanism: While scientists historically believed that carpenter ant venom relied almost entirely on simple formic acid for its toxicity, formicitoxins act as an advanced external immune defense. These peptides provide persistent antifungal and antimicrobial protection that lingers long after the highly volatile formic acid loses its potency.
Major Frameworks/Components:
- Proteotranscriptomics: Researchers combined RNA and protein data extracted from ant venom and associated tissues to isolate specific genetic sequences.
- Peptide Sequencing: The study successfully mapped 35 distinct formicitoxins belonging to two specific gene families across eight geographically distant ant species.
- Multidisciplinary Verification: The findings were confirmed using chemical analyses, synthesized peptide bioactivity assays, genome sequencing, and computer-assisted structural modeling.
Branch of Science: Entomology, Evolutionary Biology, Biochemistry, and Pharmaceutical Biology.
Future Application: The discovery provides fresh avenues for pharmacological research and medical drug discovery, specifically offering potential new treatments to combat the escalating global threat of human microbial and antifungal resistance.
Why It Matters: This research fundamentally redefines ant venom as a highly complex biochemical cocktail rather than a simple acid defense. It highlights the diverse ecological utility of venom—used for nest disinfection, gut acidification, and communication—while suggesting an immense, untapped reservoir of bioactive substances across thousands of ant species.
The venom of forest ants and horse ants contains numerous substances that protect the insects from pathogens. Researchers at Martin Luther University Halle-Wittenberg (MLU) and Freie Universität Berlin have succeeded for the first time in identifying and characterizing these novel antimicrobial substances in the insects’ venom. These substances are peptides, small protein molecules. The study, published in the journal Science Advances, provides new insights into nest protection and the management of microbes in insect communities. Additionally, the newly discovered substances could provide fresh impetus for medical drug discovery.
Since formic acid was first isolated from Formica ants in the seventeenth century, the venom of these ants was considered rather simple in its composition. It was believed that formic acid served as the principal toxin, and although findings from earlier studies suggested the presence of peptidic compounds in the venoms, these observations were largely overlooked. “In our project, we investigated a decades-old publication that received little attention in its time. The paper mentioned that these venoms also contain peptidic compounds,” says project lead and professor of pharmaceutical biology at Freie Universität Berlin’s Institute of Pharmacy, Timo Niedermeyer. “We investigated the venoms of eight geographically distant species of carpenter ants and uncovered 35 peptides, or formicitoxins, belonging to two gene families. The specific makeup of the formicitoxins varied from species to species, but their presence was widespread. This means that carpenter ant venom is considerably more complex than previously assumed.”
The peptides that the researchers discovered likely contribute to the hygiene of the ants’ nest. The ants spread their venom onto the brood and the area surrounding the nest, leading the researchers to propose that the formicitoxins reinforce an external immune defense that lingers after the immediate antimicrobial effects of formic acid have lost their potency. “Some of the peptides demonstrate remarkable antifungal properties. This is particularly interesting when we consider the threat that environmental microbes and pathogens pose to social communities such as ants, as well as the increased threat of microbial resistance for human well-being,” emphasizes Dr. Simon Tragust, project lead at the Institute of Biology at Martin Luther University Halle-Wittenberg. “The Formicinae subfamily comprises over 3,700 species, meaning that there is enormous potential for the discovery of more bioactive substances.”
The results confirm that carpenter ant venom performs a range of diverse functions. The ants use their venom not only for defense but also to disinfect their surroundings, to acidify their gut for microbial selection, and to communicate with other ants.
For their study, the researchers combined methods from the fields of biology, chemistry, and pharmacy. Using a proteotranscriptomic approach, they integrated protein and RNA data taken from the venom and associated tissues to identify the individual peptides, as well as their genetic sequences. They also utilized chemical analyses, performed bioactivity assays, and synthesized their own formicitoxins. The scientists gained further insight into the structure and evolutionary history of the individual venom components through biophysical experiments, genome analyses, and computer-assisted modeling.
Thanks to its interdisciplinary approach and the examination of venom from multiple ant colonies, this study represents one of the most comprehensive comparative analyses of ant venom carried out to date.
Funding: The work was funded by the German Research Foundation, the State of Saxony-Anhalt, and the Ethological Society.
Published in journal: Science Advances
Title: Beyond formic acid: Peptides in carpenter ant venoms aid in disease protection
Authors: Lukas Koch, Sandro Andreotti, Mario Schubert, Elisa Liebhart, Anton M. Zürbig, Julian Gatzki, Benjamin-Florian Hempel, Lydia Kollhoff, Barbara Feldmeyer, Martin Herzberg, Valerie I. C. Rebhahn, Nwet Nwet Win, Adria C. Leboeuf, Marat Meleshin, Fabian Herrmann, Christian Schwieger, Heike Brötz-Oesterhelt, Andrea Sinz, Mike Schutkowski, Timo H. J. Niedermeyer, and Simon Tragust
Source/Credit: Martin Luther University Halle-Wittenberg | Zum Seitenanfang
Reference Number: ent051826_01