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Biotransformation of alisol G by Penicillium janthinellum and the hCE2 inhibitory effects of its metabolites

Mai, Zhen-Peng, Xin, Xiu-Lan, Sun, Zheng, Zhang, Ning, Huang, Shan-Shan, Wang, Chao, Chen, Liang, Li, Ye, Huo, Xiao-Kui, Fan, Guang-Jun
Phytochemistry letters 2015 v.13 pp. 228-233
Alisma, Alisols, Penicillium janthinellum, bioassays, biotransformation, fungi, inhibitory concentration 50, metabolites, nuclear magnetic resonance spectroscopy, rhizomes, screening, spectral analysis, triterpenoids
Alisol G, also named 25-anhydroalisol A, is a major triterpene obtained from dried rhizomes of Alisma orientalis. This paper investigated the transformation of alisol G by fungi and evaluated the hCE2 inhibitory effects of the transformed products. By screening whole cells of 10 strains of filamentous fungi, Penicillium janthinellum AS 3.510 exhibited a special capability to transform alisol G. Four metabolites were obtained, which were determined to be new compounds on the basis of spectroscopic data, including UV, 1D- and 2D-NMR, and HRESIMS. In addition, in an in vitro bioassay, metabolites 1–4 showed significant hCE2 inhibitory activities with IC50 values of 6.81, 16.66, 3.38, and 6.33 μM, respectively.