Isolation and biosynthesis of labdanmycins: four new labdane diterpenes from endophytic Streptomyces

• Published in: ORGANIC CHEMISTRY FRONTIERS Vol. 5; no. 8; pp. 1272 - 1279
• Main Authors: Xiong, Zi-Jun, Huang, Jianping, Yan, Yijun, Wang, Li, Wang, Zhiyan, Yang, Jing, Luo, Jianying, Li, Jie, Huang, Sheng-Xiong
• Format: Journal Article
• Language: English
• Published: CAMBRIDGE Royal Soc Chemistry 21.04.2018; Royal Society of Chemistry
• Subjects: Biosynthesis; Carbonyl groups; Carbonyls; Chemistry; Chemistry, Organic; Cytochrome; Deactivation; Diterpenes; Endophytes; Gene expression; Genomes; Inactivation; NMR; Nuclear magnetic resonance; Organic chemistry; Oxidation; Panax notoginseng; Physical Sciences; Science & Technology; Streptomyces; ANTIBIOTIC PROPERTIES; TERPENOID CYCLASES; NATURAL-PRODUCTS; SYNTHASES; GEOSMIN; DIVERSITY; P450; PLATENSIMYCIN; HETEROLOGOUS EXPRESSION; SESQUITERPENOIDS
• ISSN: 2052-4129; 2052-4110; 2052-4110
• DOI: 10.1039/c8qo00085a

Chemical investigation of Streptomyces sp. KIB 015, an endophyte from the plant Panax notoginseng, led to the discovery of two novel labdane diterpenes, labdanmycins A (1) and B (2). In order to reveal the biosynthesis of labdanmycins, the genome of S. sp. KIB 015 was sequenced and a lab gene cluster encoding GGPP synthase, class II cyclase, class I cyclase, and cytochrome P450s was confirmed to be involved in labdanmycin biosynthesis by heterologous expression and gene inactivation experiments. Biogenetic precursor raimonol (3) was isolated from the gene labE inactivation mutant strain S. sp. KIB 015.labE, which suggested that P450 enzyme LabE is responsible for oxidizing the C-20 methyl group of 3 to an aldehyde or carbonyl group to afford 1 and 2. Additional two new labdane diterpenes (4 and 5) were also isolated from the mutant S. sp. KIB 015 Delta labE. The chemical structures of 1-5 were elucidated on the basis of extensive NMR and MS spectroscopic analyses.