Journal of Natural Medicines

, Volume 71, Issue 2, pp 449–456 | Cite as

Stereo- and region-specific biotransformation of physapubescin by four fungal strains

  • Chongyue Qiu
  • Ting Yuan
  • Dejuan Sun
  • Suyu Gao
  • Lixia ChenEmail author


Biotransformations of physapubescin (1) were performed by four fungal strains—Mucor subtilissimus AS 3.2454, Mucor polymorphosporus AS 3.3443, Aspergillus niger AS 3.795, and Syncephalastrum racemosum AS 3.264. Four metabolites were prepared in the biotransformation process of 1, and their structures were elucidated as 15α-acetoxy-5,6β:22,26:24,25-triepoxy-26α-hydroxy-3β-methoxy 4β-hydroxyergost-1-one (2), 15α-acetoxy-5,6β:22,26-diepoxy-4β,24β,25α,26(α, β)-tetrahydroxyergost-3β-methoxy-1-one (3a/3b), 15α-acetoxy-5,6β:22,26-diepoxy-4β,24β,25α,26(α, β)-tetrahydroxyergost-2-en-1-one (4a/4b), and physapubescin D (5), by spectroscopic data analysis. Among them, metabolites 2 and 3 are new. All of these fungal strains showed the ability to be highly stereo- and region-specific for the bioconversion of substrate (1). Our research provides a reference for the structural derivatization of withanolides or possibly even other natural products.


Physapubescin Biotransformation Fungal strains 



This work was financially supported by grants from the National Natural Science Foundation of China (NSFC) (Grant No. 31270399), Liaoning Province Natural Science Foundation (Grant Number 201602689), Scientific Research Foundation for the Returned Overseas Chinese Scholars of Shenyang Pharmaceutical University (Grant Number GGJJ2015103), 2015 Career Development Program for Young and Middle-aged Teachers of Shenyang Pharmaceutical University (Grant Number ZQN2015015).

Supplementary material

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Supplementary material 1 (DOCX 16128 kb)


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Copyright information

© The Japanese Society of Pharmacognosy and Springer Japan 2017

Authors and Affiliations

  • Chongyue Qiu
    • 1
  • Ting Yuan
    • 1
  • Dejuan Sun
    • 1
  • Suyu Gao
    • 1
  • Lixia Chen
    • 1
    Email author
  1. 1.Key Laboratory of Structure-Based Drug Design & Discovery, Department of Natural Products Chemistry, School of Traditional Chinese Materia Medica, Wuya College of Innovation, Ministry of EducationShenyang Pharmaceutical UniversityShenyangChina

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