期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 28, 页码 8754-8759出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802479
关键词
azetidine; biosynthesis; heterologous expression; natural products; vioprolide
资金
- German Ministry of Education and Research
- China Scholarship Council
Vioprolides are a promising class of anticancer and antifungal lead compounds produced by the myxobacterium Cystobacter violaceus Cbvi35. Previously nothing had been reported about their biosynthesis, including the origin of the unusual 4-methylazetidinecarboxylic acid (MAZ) moiety. We describe the vioprolide biosynthetic gene cluster and solve the production obstacle by expression in three heterologous hosts. Starting from unstable production in the wild type at the single-digit mgL(-1) scale, we developed a stable host that eventually allowed for yields of up to half a gram per liter in fermenters. Gene inactivations coupled with isotope feeding studies identified an S-adenosylmethionine (SAM)-dependent enzyme and a methyltransferase as being responsible for the generation of the MAZ building block by a proposed mechanism unprecedented in bacteria. Furthermore, nonnatural vioprolide derivatives were generated via rational genetic engineering.
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