Microorganisms often assemble natural products similar to industrial assembly lines. Certain enzymes, non-ribosomal peptide synthetases (NRPS) play a key role in this process. Biotechnologists at Goethe University have now been able to discover how these enzymes interact with each other. This brings them one step closer to their goal of engineering the production of such peptide natural products.
Frankfurt am Main/Germany — Many important natural products such as antibiotics, immunosuppressants, or cancer drugs are derived from microorganisms. These natural products are often small proteins or peptides which are generated in the cell by NRPS enzymes similar to a modern automobile factory: at each station additional parts are added to the basic structure until finally a completed automobile leaves the factory. With regard to the NRPS, a specific amino acid is incorporated and processed at each station (module), so that in the end peptides emerge that can be linear, cyclic or otherwise modified including unusual amino acids.
If larger peptides are generated by these systems, often several NRPS enzymes — or assembly lines — operate successively. The order in which this happens is determined by docking domains. These are small regions at the end of the assembly lines that fit with the next NRPS enzyme in line like a key in a lock. Although the basic principles of these NRPS interactions have been known for a long time, the structure of the docking domains was unknown until now. The research groups led by Professor Jens Wöhnert form the Institute of Molecular Biosciences and Professor Helge Bode from Molecular Biotechnology at Goethe University have now been able to successfully explain this.
The scientists were able to determine the structures of individual docking domains and, for the first time, an NRPS docking domain pair as well. According to Carolin Hacker, who is a PhD student in Jens Wöhnert’s group, this made it possible to clarify the rules for the interaction of the docking domains and to change them in such a way that new natural products will be generated.
The team is only at the beginning of their research: They need structures of additional and structurally diverse docking domains so that in the end they can utilise them like building blocks. Their goal is to connect various biosynthesis pathways and create totally new substances. Research in this area continues in both groups as part of the Loewe research cluster Mega Syn.
Publication: Carolin Hacker, Xiaofeng Cai, Carsten Kegler, Lei Zhao, A. Katharina Weickhmann, Jan Philip Wurm, Helge B. Bode, Jens Wöhnert: Structure-based redesign of docking domain interactions modulates the product spectrum of a rhabdopeptide-synthesizing NRPS, Nature Communications, https://www.nature.com/ncomms/, DOI: 10.1038/s41467-018-06712-1