期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 32, 页码 9478-9482出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201705501
关键词
alkaloids; biosynthesis; okaramines
资金
- Ministry of Science and Technology (MOST), Taiwan [105-2113-M-001-013]
The okaramines are a class of complex indole alkaloids isolated from Penicillium and Aspergillus species. Their potent insecticidal activity arises from selectively activating glutamate-gated chloride channels (GluCls) in invertebrates, not affecting human ligand-gated anion channels. Okaramines B (1) and D (2) contain a polycyclic skeleton, including an azocine ring and an unprecedented 2-dimethyl-3-methyl-azetidine ring. Owing to their complex scaffold, okaramines have inspired many total synthesis efforts, but the enzymology of the okaramine biosynthetic pathway remains unexplored. Here, we identified and characterized the biosynthetic gene cluster (oka) of 1 and 2, then elucidated the pathway with target gene inactivation, heterologous reconstitution, and biochemical characterization. Notably, we characterized an a-ketoglutarate-dependent non-heme FeII dioxygenase that forged the azetidine ring on the okaramine skeleton.
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