Mit Hilfe des chromatographischen Aufteilungsverfahrens Al 2 O 3und durch Papierchromatographieliesen sich im Chloroformextrakt eines neuen Handelsmusters von Ch'an Su 11 Bufogenine nachweisen,woon 10 in reiner formpräparativherausgearbeitet werden konnten,währenddas elfteung(EstansBénifuf)(Substanz B =赖恩·埃哈尔滕·韦登·康特。Din einzelnen Bufogenine在不丹的Mengen Enthalten(bezogen auf die rohe Droge)中对Ch'an-Su
Enzymatic Synthesis of Bufadienolide<i>O</i>-Glycosides as Potent Antitumor Agents Using a Microbial Glycosyltransferase
作者:Kai Li、Jin Feng、Yi Kuang、Wei Song、Meng Zhang、Shuai Ji、Xue Qiao、Min Ye
DOI:10.1002/adsc.201700777
日期:2017.11.10
significant cytotoxic activities against A549 and MCF7 human cancer cell lines, and showed potent inhibitory activities against Na+/K+‐ATPase with IC50 values in the range 0.053–0.76 μM. In particular, bufalin 3‐O‐β‐d‐glucoside showed enhanced water solubility (25‐fold increase from bufalin) and potentantitumor activities (30% inhibition rate, 1.4 mg kg−1, i.p.) on A549 human lung cancer xenograft Balb/c
丁二烯内酯是一类天然的强心类固醇,以其抗肿瘤活性而闻名。不良的水溶性阻碍了它们的临床应用。酶促糖基化是改善天然产物的溶解度的有利方法。在这项工作中,我们描述了高效的一步法合成布法地那利O-葡萄糖苷和O-半乳糖苷使用微生物糖基转移酶YjiC1,转化率从63%到99%。从14种底物中获得了总共24种糖苷,包括17种新化合物,并通过广泛的NMR和高分辨率电喷雾电离质谱(HR-ESI-MS)分析鉴定了它们的结构。这些产物属于五种类型:3β-OH,7β-OH,3β,7β-di-OH,11α-OH和12β-OH的糖基化。的C-7β或C-11α Ö bufadienolide的-glycosides报道首次。此外,3- O-糖苷对A549和MCF7人癌细胞系表现出显着的细胞毒活性,并显示出对Na + / K + -ATPase的有效抑制活性(IC 50)值在0.053-0.76μM范围内。特别是,bufalin
Characterization of regio- and stereo-selective sulfation of bufadienolides: exploring the mechanism and providing insight into the structure–sulfation relationship by experimentation and molecular docking analysis
bufadienolides (including bufalin, resibufogenin, cinobufagin, bufotalin, telocinobufagin and deacetylcinobufagin) in amphibian skin secretion and to provide insight into the structure–sulfation relationship by experimentation and molecular docking analysis with series of bufadienolides and derivatives. For all the six representative bufadienolides, one corresponding monosulfate was detected in the incubation
A permissive steroid glycosyltransferase (UGT74AN1) from Asclepias curassavica exhibited robust capabilities for the regiospecific C3 glycosylation of cardiotonic steroids and C-21 steroid precursors, and unprecedented promiscuity toward 53 structurally diverse natural and unnatural compounds to form O-, N-, and S-glycosides, along with the catalytic reversibility for a one-pot transglycosylation reaction. These findings highlight UGT74AN1 as the first regiospecific catalyst for cardiotonic steroid C3 glycosylation and exhibit significant potential for glycosylation of diverse bioactive molecules in drug discovery.