Synthetic Racemate and Enantiomers of Cytosporone E, a Metabolite of an Endophytic Fungus, Show Indistinguishably Weak Antimicrobial Activity
作者:Tomoya OHZEKI、Kenji MORI
DOI:10.1271/bbb.67.2584
日期:2003.1
The racemate and the enantiomers of cytosporone E [3-heptyl-4,5,6-trihydroxyphthalide (1)], a metabolite of the endophytic fungus, CR200 (Cytospora sp.), were synthesized. The key steps were (i) Sharpless asymmetric dihydroxylation of an alkene (8) and (ii) HPLC separation of the enantiomers of tert-butyldimethylsilyl ether (12) on a chiral stationary phase. The racemate and enantiomers of cytosporone E showed only weak antimicrobial activity with no difference among them.
合成了内生真菌CR200(Cytospora sp.)的代谢物细胞霉素E [3-庚基-4,5,6-三羟基邻苯二甲酸内酯(1)] 的外消旋体和其对映体。关键步骤为: (i) 烯烃(8)的Sharpless不对称二羟基化, (ii) 在手性固定相上进行的三丁基二甲基硅醚(12)对映体的高效液相色谱分离。细胞霉素E的外消旋体和对映体仅表现出微弱的抗菌活性,且之间没有差异。
Cytosporone E: racemic synthesis and preliminary antibacterial testing
作者:Jeffrey D. Hall、Nathan W. Duncan-Gould、Nasar A. Siddiqi、Jennifer N. Kelly、L. Alexis Hoeferlin、Susan J. Morrison、Justin K. Wyatt
DOI:10.1016/j.bmc.2004.10.018
日期:2005.2
The antibiotic cytosporone E (isolated from the broth of the endophytic fungi CR 200 (Cytospora sp.) and CR 146 (Diaporthe sp.)) was synthesized as a racemic mixture. The key step in the synthesis is the Meyers ortho-alkylation of a chiral aromatic oxazoline. Preliminary antibiotic activity shows antibiosis against Gram-positive bacteria but not Gram-negative bacteria as previously reported. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis, antibacterial and cytotoxic evaluation of cytosporone E and analogs
history of antibacterial discovery has revealed that natural products, especially secondary metabolites, represent privileged chemical matters for the antibacterial discovery. Among these metabolites, several natural phthalides exhibit interesting antibacterial activities, such as cytosporone E isolated from endophyte ascomycetes Diaporthe and Cytospora sp. We describe herein the synthesis and the pharmacomulations
抗菌发现的历史表明,天然产物,尤其是次级代谢产物,代表了抗菌发现的特殊化学物质。在这些代谢物中,几种天然苯酞表现出令人感兴趣的抗菌活性,例如从内生菌子囊菌Diaporthe和Cytospora sp. 中分离出的胞孢菌素E。我们在此描述了胞孢菌素 E 的 3、4 和 6 位的合成和药物代谢,然后这些化合物对金黄色葡萄球菌包括耐药菌株、大肠杆菌和铜绿假单胞菌的体外抗菌评价. 对最活跃的化合物对人支气管上皮细胞的细胞毒性进行了评估,以检查它们的安全性。
Biosynthesis of Cytosporones in Leotiomycetous Filamentous Fungi
作者:Li Li、Weimao Zhong、Hang Liu、Patricia Espinosa-Artiles、Ya-ming Xu、Chen Wang、Jose Manuel Verdugo Robles、Tiago Antunes Paz、Marielle Cascaes Inácio、Fusheng Chen、Yuquan Xu、A. A. Leslie Gunatilaka、István Molnár
DOI:10.1021/jacs.3c14066
日期:2024.3.6
isochroman-3-one pharmacophore are rare among fungal natural products as their biosynthesis requires an unorthodox S-type aromatic ring cyclization. Genome mining uncovered a conserved gene cluster in select leotiomycetous fungi that encodes the biosynthesis of cytosporones, including isochroman-3-one congeners. Combinatorial biosynthesis in total biosynthetic and biocatalytic formats in Saccharomyces cerevisiae
具有异色满-3-酮药效基团的聚酮化合物在真菌天然产物中很少见,因为它们的生物合成需要非正统的 S 型芳环环化。基因组挖掘在选定的leotiomycetous真菌中发现了一个保守的基因簇,该基因簇编码细胞孢子酮的生物合成,包括isochroman-3-one同源物。酿酒酵母中全生物合成和生物催化形式的组合生物合成以及使用纯化酶的关键反应的体外重建揭示了细胞孢子酮结构和生物活性多样性是如何产生的。细胞孢子酮的 S 型酰基二羟基苯乙酸 (ADA) 核心由协作的聚酮合酶对组装。硫酯酶结构域催化的酯交换反应释放 ADA 酯,其中一些是已知的 Nur77 调节剂。或者,水解释放允许 C6 通过黄素依赖性单加氧酶羟基化,产生三羟基苯部分。通过短链脱氢酶/还原酶还原 C9 羰基会引发 isochroman-3-one 形成,从而提供具有细胞毒性和抗菌活性的细胞孢子酮。烯酰二-或三羟基苯乙酸作为分流产物生成,而异可尔曼-3