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Functional characterization of an oxidosqualene cyclase (PdFRS) encoding a monofunctional friedelin synthase in Populus davidiana

  • Jung Yeon Han
  • Chang-Ho Ahn
  • Prakash Babu Adhikari
  • Subramanyam Kondeti
  • Yong Eui Choi
Original Article
Part of the following topical collections:
  1. Terpenes and Isoprenoids


Main conclusion

An oxidosqualene cyclase (PdFRS) from Populus davidiana was characterized as a monofunctional friedelin synthase by its heterologous expression in yeast and overexpression in plants.

Triterpenes are one of the largest classes of plant chemical compounds composed of three terpene units, which form the basic skeleton of all sterols and saponins. Friedelin (friedelan-3-one), a pentacyclic triterpene, occurs in many plant families and is particularly present in rich amounts in cork tissues from trees. The biosynthesis of friedelin occurs through the oxidosqualene cyclase (OSC) enzyme that generates friedelin from 2,3-oxidosqualene after the maximum rearrangement of a triterpene skeleton. Populus davidiana is called Korean aspen and grows in northern East Asia. From 57,322 unique sequences generated from the P. davidiana transcriptome database, one complete coding sequence (PdFRS) was obtained from a contig, which showed 74% identity to Betula platyphylla β-amyrin synthase and 73% identity with friedelin synthase from Maytenus ilicifolia. The open reading frame (ORF) region of the PdFRS sequence was 2280 bp long and composed a 759 amino acid protein with a predicted molecular mass of 87.81 kDa. qPCR analysis revealed that methyl jasmonate treatments strongly upregulated PdFRS gene expression and resulted in enhanced friedelin accumulation in leaves. Heterologous expression of the PdFRS gene in yeast resulted in the production of friedelin triterpene as a single product, which was confirmed by comparison with the mass fragmentation pattern from an authentic friedelin standard by GC/MS analysis. Transgenic P. davidiana overexpressing the PdFRS gene was constructed via Agrobacterium-mediated transformation. Overexpression of PdFRS in transgenic P. davidiana lines resulted in enhanced friedelin production.


Populus davidiana Friedelin synthase Triterpene synthase Oxidosqualene cyclase 



Gas chromatography–mass spectrometry


Oxidosqualene cyclase


Open reading frame


Populus davidiana friedelin synthase gene


Quantitative polymerase chain reaction


Reverse transcription-polymerase chain reaction



This work was supported by the Rural Development Administration, Republic of Korea [Next-Generation Bio-Green 21 Program (PJ01344401 and PJ01369103)].

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jung Yeon Han
    • 1
  • Chang-Ho Ahn
    • 1
  • Prakash Babu Adhikari
    • 1
  • Subramanyam Kondeti
    • 1
  • Yong Eui Choi
    • 1
  1. 1.Department of Forest Resources, College of Forest and Environmental SciencesKangwon National UniversityChuncheonRepublic of Korea

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