Adam, S., Zheng, D., Klein, A., Volz, C., Mullen, W. , Shirran, S. L., Smith, B. O. , Kalinina, O. V., Müller, R. and Koehnke, J. (2023) Unusual peptide-binding proteins guide pyrroloindoline alkaloid formation in crocagin biosynthesis. Nature Chemistry, (doi: 10.1038/s41557-023-01153-w) (Early Online Publication)
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Abstract
Ribosomally synthesized and post-translationally modified peptide natural products have provided many highly unusual scaffolds. This includes the intriguing alkaloids crocagins, which possess a tetracyclic core structure and whose biosynthesis has remained enigmatic. Here we use in vitro experiments to demonstrate that three proteins, CgnB, CgnC and CgnE, are sufficient for the production of the hallmark tetracyclic crocagin core from the precursor peptide CgnA. The crystal structures of the homologues CgnB and CgnE reveal them to be the founding members of a peptide-binding protein family and allow us to rationalize their distinct functions. We further show that the hydrolase CgnD liberates the crocagin core scaffold, which is subsequently N-methylated by CgnL. These insights allow us to propose a biosynthetic scheme for crocagins. Bioinformatic analyses based on these data led to the discovery of related biosynthetic pathways that may provide access to a structurally diverse family of peptide-derived pyrroloindoline alkaloids.
| Item Type: | Articles |
|---|---|
| Status: | Early Online Publication |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Zheng, Mr Dazhong and Mullen, Dr Bill and Koehnke, Professor Jesko and Smith, Dr Brian |
| Authors: | Adam, S., Zheng, D., Klein, A., Volz, C., Mullen, W., Shirran, S. L., Smith, B. O., Kalinina, O. V., Müller, R., and Koehnke, J. |
| College/School: | College of Science and Engineering > School of Chemistry College of Medical Veterinary and Life Sciences > School of Cardiovascular & Metabolic Health College of Medical Veterinary and Life Sciences > School of Molecular Biosciences |
| Journal Name: | Nature Chemistry |
| Publisher: | Nature Research |
| ISSN: | 1755-4330 |
| ISSN (Online): | 1755-4349 |
| Published Online: | 09 March 2023 |
| Copyright Holders: | Copyright © 2023 The Authors |
| First Published: | First published in Nature Chemistry 2023 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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