Activity-Guided Fractionation of the Leaves of <i>Ormosia </i><i>s</i><i>umatrana</i> Using a Proteasome Inhibition Assay
作者:Bao-Ning Su、Bang Yeon Hwang、Heebyung Chai、Esperanza J. Carcache-Blanco、Leonardus B. S. Kardono、Johar J. Afriastini、Soedarsono Riswan、Robert Wild、Naomi Laing、Norman R. Farnsworth、Geoffrey A. Cordell、Steven M. Swanson、A. Douglas Kinghorn
DOI:10.1021/np040134g
日期:2004.11.1
Activity-guided fractionation of a chloroform-soluble extract of the leaves of Ormosia sumatrana, using a proteasome inhibition assay, led to the isolation of a new A-type proanthocyanidin derivative, 3'-O-cinnamoylprocyanidin A-2 (1), and a new cerebroside, sumatranoside (2). The structures of these two isolates were determined as epicatechin-(2beta-->O-7',4beta-->8')-epicatechin-3'-O-cinnamate (1) and 1-O-(beta-D-glucopyranosyl)-(2S,3S,4R)-2N-[(2'R)-2'-hydroxy-tetracosanoyl]-9Z-octadecene-1,3,4-triol (2), respectively, by spectroscopic and chemical methods. Sumatranoside (2) exhibited proteasome inhibitory activity with an IC50 value of 30 muM.