6-Tuliposide B is a secondary metabolite occurring specifically in tulip anthers. Recently, a potent antibacterial activity of 6-tuliposide B has been reported. However, its molecular target has not yet been established, nor its action mechanism. To shed light on such issues, 6-tuliposide B and tulipalin B analogues were synthesized and a structure-activity relationship (SAR) was examined using a broad panel of bacterial strains. As the results of SAR among a total of 25 compounds, only tulipalin B and the compounds having 3',4'-dihydroxy-2'-methylenebutanoate (DHMB) moieties showed any significant antibacterial activity. Moreover, the 3'R analogues of these compounds displayed essentially the same activities as 6-tuliposide B and the structure of the 3'R-DMBA moiety was the same as that of the proposed active moiety of cnicin. These results suggest that 6-tuliposide B has the same action mechanism as proposed for cnicin and bacteria) MurA is one of the major molecular targets of 6-tuliposide B. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of (S)-(+)-methyl .BETA.,.GAMMA.-dihydroxy-.ALPHA.-methylenebutyrate and (S)-(-)-tulipalin B.
作者:Akira TANAKA、Kyohei YAMASHITA
DOI:10.1271/bbb1961.44.199
日期:——
The synthesis of (S)-(+)-methyl β, γ-dihydroxy-α-methylenebutyrate and (S)-(-)-tulipalin B, antibacterial substances isolated from Spiraea thunliergii Sieb. has been accomplished starting from isopropylidene-D-glyceraldehyde.