Oenothein B, dimeric hydrolysable tannin inhibiting HCV invasion from Oenothera erythrosepala
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.
KeywordsHepatitis C virus Envelope protein E1 and E2 Oenothera erythrosepala Oenothein B Invasion inhibitor
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.
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Conflicts of interest
The authors declare no conflicts of interest.
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