Three known thiocarbamate (TC)- and isothiocyanate (ITC)-related compounds have been isolated from the leaves of Moringa oleifera, a traditional herb in southeast Asia, as inhibitors of tumor promoter teleocidin B-4-induced Epstein-Barr virus (EBV) activation in Raji cells. Interestingly, only niaziminin among 10 TCs including 8 synthetic ones showed considerable inhibition against EBV activation. The structure-activity relationships indicated that the presence of an acetoxy group at the 4′-position of niaziminin is important and indispensable for inhibition. On the other hand, among the ITC-related compounds, naturally occurring 4-[(4′-O-acetyl-α-L-rhamnosyloxy)benzyl]ITC and commercially available allyl- and benzyl-ITC significantly inhibited activation, suggesting that the isothiocyano group is a critical structural factor for activity.
从东南亚传统草药
辣木的叶子中分离出三种已知的
硫代
氨基甲酸盐(TC)和异
硫氰酸盐(ITC)相关化合物,它们被鉴定为肿瘤
促进剂大田
软海绵素B-4诱导的Raji细胞中的爱泼斯坦-巴尔病毒(EBV)激活的
抑制剂。有趣的是,在包括8种合成化合物在内的10种TC中,只有niaziminin表现出对EBV激活的显著抑制作用。结构-活性关系研究表明,niaziminin在4′-位置上的乙酰
氧基对于抑制作用至关重要且不可或缺。另一方面,在ITC相关化合物中,
天然存在的4-[(4′-O-
乙酰基-α-
L-鼠李糖基
氧)
苄基]ITC以及市售的
烯丙基-和
苄基-ITC均显著抑制激活,表明异
硫氰酸根基团是活性中的关键结构因素。