wild-type enzyme and conserved regioselectivity. Based on the results of molecular docking and molecular dynamics simulations, it was proposed that the improved enzymatic activity and substrate promiscuity were likely owing to the stable hydrophobic interactions and favorite conformations between the enzyme and substrates. This work has also laid a foundation for the engineering of other plant UGTs for their
Triterpenes and Meroterpenes with Neuroprotective Effects from <i>Ganoderma leucocontextum</i>
作者:Hongyu Chen、Jinjin Zhang、Jinwei Ren、Wenzhao Wang、Weiping Xiong、Yaodong Zhang、Li Bao、Hongwei Liu
DOI:10.1002/cbdv.201700567
日期:2018.5
metabolites including three new lanostane triterpenes, ganoleucoins Q – S (1 – 3), as well as thirteen known compounds (4 – 16). The structures of compounds 1 – 3 were determined by NMR, MS, CD spectral analysis, and chemical derivation method. The neuroprotective effects of compounds 1 – 16 were tested on PC12 cells. Compounds 1 and 2 showed protective effects against the H2O2 induced damage with
recognition of aldosereductaseinhibitoryactivity. Moreover, double bond moiety at C-20 and C-22 in the side chain contributes to improving aldosereductaseinhibitoryactivity. In the case of ganoderic acid C2, all of OH substituent at C-3, C-7 and C-15 is important for potent aldosereductase inhibition. These results provide an approach to understanding the structural requirements of ganoderma acids from
Lanostane triterpenoids from cultivated fruiting bodies of Ganoderma sichuanense: Determination of the C-25 absolute configuration of ganoderic acid A and its derivatives using the phenylglycine methyl ester (PGME) method
undescribed lanostane triterpenoids, together with twenty-one known compounds, were isolated from artificially cultivated fruiting bodies of the basidiomycete Ganoderma sichuanense. The absoluteconfiguration at C-25 of ganoderic acid A and its derivatives was determined to be 25R by application of the phenylglycine methyl ester (PGME) method. Among the isolated compounds, ganoderiol F exhibited the most potent
从人工栽培的四川担子菌子实体中分离出三种未描述的羊毛脂烷三萜类化合物以及二十一种已知化合物。通过应用苯基甘氨酸甲酯 (PGME) 方法确定灵芝酸 A 及其衍生物在 C-25 处的绝对构型为 25 R。在分离的化合物中,灵芝酚 F 对结核分枝杆菌H37Ra表现出最有效的活性,MIC 值为 0.781 μg/ml。
Toxic lanostane triterpenes from the basidiomycete Ganoderma amboinense
A highly oxygenated new lanostane triterpene, designated as ganodermacetal (1), together with 15 related known compounds, has been isolated from the fruiting bodies of the basidiomycetous fungus Ganoderma amboinense. The structure of the new metabolite was elucidated on the basis of extensive spectroscopic analyses and chemical transformations. Ganodermacetal (1) possesses an uncommon 7,15-acetonide unit. Some of the isolated compounds showed significant toxic activity against brine shrimp larvae. (C) 2012 Phytochemical Society of Europe. Published by Elsevier B. V. All rights reserved.