期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 8, 页码 4104-4109出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202011741
关键词
antibiotics; enzymes; natural products; nonribosomal peptides; thioamide
资金
- Humboldt Research Fellowship for Postdoctoral Researchers
- DFG
- Projekt DEAL
The final steps of CTA maturation involve a surprising split-merge pathway utilizing a thiotemplated intermediate, with the involvement of an aldo-keto reductase and a transthioamidating transglutaminase. This sheds light on largely unexplored pathways for NRPS-independent peptide biosynthesis.
Closthioamide (CTA) is a symmetric nonribosomal peptide (NRP) comprised of two diaminopropane-linked polythioamidated monomers. CTA is biosynthesized by Ruminiclostridium cellulolyticum via an atypical NRP synthetase (NRPS)-independent biosynthetic pathway. Although the logic for monomer assembly was recently elucidated, the strategy for the biosynthesis and incorporation of the diamine linker remained a mystery. By means of genome editing, synthesis, and in vitro biochemical assays, we demonstrate that the final steps in CTA maturation proceed through a surprising split-merge pathway involving the dual use of a thiotemplated intermediate. This pathway includes the first examples of an aldo-keto reductase catalyzing the reductive release of a thiotemplated product, and of a transthioamidating transglutaminase. In addition to clarifying the remaining steps in CTA assembly, our data shed light on largely unexplored pathways for NRPS-independent peptide biosynthesis.
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