期刊
MOLECULES
卷 21, 期 1, 页码 -出版社
MDPI AG
DOI: 10.3390/molecules21010059
关键词
marine myxobacterium; Haliangium ochraceum; haliamide; polyketide; biosynthesis
资金
- China State-Funded Postgraduates Overseas Study Program from the Chinese Scholarship Council
- Grants-in-Aid for Scientific Research [14J03069, 26252015] Funding Source: KAKEN
Myxobacteria of marine origin are rare and hard-to-culture microorganisms, but they genetically harbor high potential to produce novel antibiotics. An extensive investigation on the secondary metabolome of the unique marine myxobacterium Haliangium ochraceum SMP-2 led to the isolation of a new polyketide-nonribosomal peptide hybrid product, haliamide (1). Its structure was elucidated by spectroscopic analyses including NMR and HR-MS. Haliamide (1) showed cytotoxicity against HeLa-S3 cells with IC50 of 12 M. Feeding experiments were performed to identify the biosynthetic building blocks of 1, revealing one benzoate, one alanine, two propionates, one acetate and one acetate-derived terminal methylene. The biosynthetic gene cluster of haliamide (hla, 21.7 kbp) was characterized through the genome mining of the producer, allowing us to establish a model for the haliamide biosynthesis. The sulfotransferase (ST)-thioesterase (TE) domains encoded in hlaB appears to be responsible for the terminal alkene formation via decarboxylation.
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