In a groundbreaking study, researchers at the Leibniz-Institute for Natural Product Research and Infection Biology (Leibniz-HKI) have unraveled the complex defense mechanism employed by certain bacteria to fend off predators. Led by Pierre Stallforth, Ute Hellmich, and Markus Lakemeyer, the team has detailed how bacteria of the genera Pseudomonas and Paenibacillus collaborate to protect themselves from amoebas. This significant discovery, conducted by the Cluster of Excellence Balance of the Microverse at the University of Jena, has been published in the Journal of the American Chemical Society (JACS).
The research reveals that the cooperation between Pseudomonas sp. SZ40 and Paenibacillus sp. SZ31 hinges on a natural product known as syringafactin. Produced by Pseudomonas, syringafactin is transformed into a toxic compound for amoebas through a unique modification by Paenibacillus. This transformation is facilitated by two specialized enzymes, DL peptidases, which cleave the lipopeptide at an unusual site.
Understanding the Molecular Mechanism
The study’s analysis at the molecular level has provided a clearer understanding of the interaction between these bacteria. “It was very exciting for me to understand the mechanism by which the special class of DL lipopeptides is cleaved and how this can be exploited in the interaction of microbes,” explained Ute Hellmich. The unique aspect of these natural products lies in their unusual site of attack in the spatial structure of the lipopeptides.
“Amino acids are normally L-configured in nature, which is why most enzymes are specialized in cleaving this variant,” said Pierre Stallforth. “D and L forms differ only in their symmetry; they are mirror-image molecules with the same atomic composition.”
This distinction is crucial because it allows researchers to differentiate between the two forms, despite their identical appearance under many analytical methods. As Hellmich illustrates, “This means that for many analytical methods, both molecules look the same, even though we know that there is a huge difference between using the left or right hand.”
Implications for Future Research
The discovery of this bacterial cooperation mechanism is not just an isolated case but represents a broader, specific mechanism that could have far-reaching implications. According to Stallforth, “These enzymes are so interesting because we can use them to elucidate the structure of complex natural substances by selectively dividing them into smaller fragments.” Markus Lakemeyer added, “And that will make it easier for us and other groups to analyze new natural substances in the future.”
This advancement is poised to aid significantly in the development of novel natural product-based anti-infectives, potentially revolutionizing the field of biotechnology and pharmaceuticals.
Collaboration and Interdisciplinarity
The success of this study underscores the importance of collaboration and interdisciplinary approaches in scientific research. Hellmich emphasized the organic teamwork among researchers, akin to the bacterial cooperation they studied. “Individually, none of us would have been able to tackle this problem in this way,” she noted. “Here in Jena, we were able to go from small natural substances to protein structures in cells to the ecological context, and we also had an application in biotechnology.”
“I have never experienced anything like Jena at any other location,” added Lakemeyer. “It’s just fun when you can look at the same problem from different angles and then also have great colleagues.”
The study was a collaborative effort involving the Leibniz-HKI, the Universities of Jena and Würzburg, and supported by the Werner Siemens Foundation, the Balance of the Microverse Cluster of Excellence, and the ChemBioSys Collaborative Research Center.
The Researchers and Their Contributions
The team comprised Shuaibing Zhang, Ying Huang, Kevin Schlabach, Mai Anh Tran, Raed Nachawati, Anna Komor, Christian Hertweck, and Pierre Stallforth from Leibniz-HKI, Markus Lakemeyer and Ute Hellmich from Friedrich Schiller University Jena, and Nicole Bader and Hermann Schindelin from Julius Maximilian University of Würzburg.
Their collective efforts have not only advanced our understanding of microbial interactions but also highlighted the dynamic and collaborative nature of scientific discovery.
The original publication, titled “Microbial DL-Peptidases Enable Predator Defense and Facilitate Structure Elucidation of Complex Natural Products,” can be found in JACS, authored by Zhang S, Huang Y, Schlabach K, Tran M A, Nachawati R, Bader N, Komor A J, Hertweck C, Schindelin H, Lakemeyer M, Hellmich U A, and Stallforth P.
