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Journal of Natural Medicines

, Volume 73, Issue 1, pp 67–75 | Cite as

Oenothein B, dimeric hydrolysable tannin inhibiting HCV invasion from Oenothera erythrosepala

  • Satoru TamuraEmail author
  • Gang-Ming Yang
  • Teruaki Koitabashi
  • Yoshiharu Matsuura
  • Yasumasa Komoda
  • Tomikazu Kawano
  • Nobutoshi Murakami
Original Paper

Abstract

The envelope proteins of the hepatitis C virus (HCV), E1 and E2, have been revealed to be essential for invasion of HCV. Thus, we were engaged in the search for the inhibitors against HCV invasion through the assay system using the model virus expressing recombinant HCV envelopes, E1 and E2. Now, we disclosed dimeric hydrolysable tannin oenothein B (1) from MeOH extract of Oenothera erythrosepala as an active principle for inhibition of HCV invasion and its potency was almost the same as that of monomeric hydrolysable tannin, tellimagrandin I (2). Furthermore, by use of stereoselectively prepared 1-β- and 1-α-O-methyl tellimagrandin Is (4 and 5), the introduction of methyl moiety into 1-hydroxy group of 2 was clarified to result in slightly reduction of activity and β-isomer was revealed to exhibit a little stronger activity than α-one.

Keywords

Hepatitis C virus Envelope protein E1 and E2 Oenothera erythrosepala Oenothein B Invasion inhibitor 

Notes

Acknowledgements

This work was supported by JSPS KAKENHI Grant number JP16790011, Grant-in-Aid for Young Scientists (B) and Research funds from San-Ei Gen F. F. I. Inc.

Compliance with ethical standards

Conflicts of interest

The authors declare no conflicts of interest.

Supplementary material

11418_2018_1239_MOESM1_ESM.docx (1.7 mb)
Supplementary material 1 (DOCX 1785 KB)

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Copyright information

© The Japanese Society of Pharmacognosy and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate School of Pharmaceutical SciencesOsaka UniversitySuitaJapan
  2. 2.School of PharmacyIwate Medical UniversityIwateJapan
  3. 3.Research Center for Emerging Infectious Diseases, Research Institute for Microbial DiseasesOsaka UniversitySuitaJapan

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