Document Detail

Biotransformation of Ursolic Acid by an Endophytic Fungus from Medicinal Plant Huperzia serrata.
MedLine Citation:
PMID:  21881267     Owner:  NLM     Status:  In-Data-Review    
Endophytic fungi were used not only for their producing bioactive products but also for their ability to transform natural compounds. An endophytic fungus, isolated from medicinal plant Huperzia serrata, was identified as Umbelopsis isabellina based on the internal transcribed spacer of ribosomal DNA (rDNA-ITS) region. It was used to transform ursolic acid (1), a pentacyclic triterpene. Incubation of ursolic acid with U. isabellina afforded three products, 3β-hydroxy-urs-11-en-28,13-lactone (2), 3β,7β-dihydroxy-urs-11-en-28,13-lactone (3), 1β,3β-dihydroxy-urs-11-en-28,13-lactone (4). Although product 2 was a known compound, it was first obtained by microbial transformation. Products 3 and 4 were new compounds. The structural elucidation of the three compounds was achieved mainly by the 1D- and 2D-NMR, MS, IR data. The endophytic fungus U. isabellina can hydroxyate the C12-C13 double bond at position 13 of ursolic acid 1 and form a five-member lactone effectively. In the meantime, this fungus can also introduce the hydroxyl group at C-1 or C-7 of ursolic acid 1.
Shao-Bin Fu; Jun-Shan Yang; Jin-Long Cui; Xu Feng; Di-An Sun
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chemical & pharmaceutical bulletin     Volume:  59     ISSN:  1347-5223     ISO Abbreviation:  Chem. Pharm. Bull.     Publication Date:  2011  
Date Detail:
Created Date:  2011-09-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0377775     Medline TA:  Chem Pharm Bull (Tokyo)     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1180-2     Citation Subset:  IM    
Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College.
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