Abstract
The biotransformation of tanshinone IIA to a new antibacterial agent tanshisorbicin (1) by the fungus Hypocrea sp. (AS 3.17108) is described. The structure of tanshisorbicin is a hybrid of tanshinone IIA (2) and sorbicillinol (3). The latter is a metabolite produced by Hypocrea sp. The structure of tanshisorbicin was determined using mass spectrometry, NMR spectroscopy, and ECD calculations. The anti-MRSA activity of 1 was found to be significantly higher than that of the parent substrate Tan IIA. Preliminary experiments indicate that tanshisorbicin is formed via a [4+2] cycloaddition reaction that is likely catalyzed by microbial enzyme.
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Acknowledgments
This work was supported by the National Program on Key Basic Research Project (973 program, 2013CB734000) and by grants from the China Ocean Mineral Resources R&D Association (DY125-15-T-07), the National Natural Science Foundation of China (81573341, 81102369, 81302678, 31430002, 31400090, 31320103911, 31125002), the Ministry of Science and Technology of China (2013ZX10005004-005 and 2011ZX09102-011-11), the National Institutes of Health (GM40541), the Welch Foundation (F-1511), and the European Union’s Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 312184. L.Z. is an awardee of the National Distinguished Young Scholar Program in China.
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He, W., Liu, M., Li, X. et al. Fungal biotransformation of tanshinone results in [4+2] cycloaddition with sorbicillinol: evidence for enzyme catalysis and increased antibacterial activity. Appl Microbiol Biotechnol 100, 8349–8357 (2016). https://doi.org/10.1007/s00253-016-7488-6
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DOI: https://doi.org/10.1007/s00253-016-7488-6
Keywords
- Biotransformation
- [4+2] cycloaddition reaction
- Tanshinone IIA
- Hypocrea sp