Linfuranones B and C, Furanone-Containing Polyketides from a Plant-Associated Sphaerimonospora mesophila
摘要:
Two new furanone-containing polyketides, linfuranones B and C, were isolated from a plant-associated actinomycete of the genus Sphaerimonospora. Their structures were determined by NMR and MS spectroscopic analyses, and the absolute configurations were established by anisotropic methods and chemical degradation approaches. In silico analysis of biosynthetic genes suggested that linfuranone B is generated from linfuranone C by oxidative cleavage of the polyketide chain. Linfuranones B and C induced preadipocyte differentiation into matured adipocytes at 20-40 mu M without showing cytotoxicity.
大环内酯类抗生素红霉素 A 及其半合成类似物已成为治疗传染病最有用的抗菌剂之一。使用最近开发的用于 6-脱氧红霉素 D 类似物的前体导向生物合成和菌落生物测定的化学遗传策略,我们确定了一类新的炔基和烯基取代的大环内酯类,其活性与天然产物的活性相当。进一步的分析揭示了抗生素活性对前体的大小和不饱和度的显着和出乎意料的依赖性。基于这些线索,我们还报告了 15-炔丙基红霉素 A 的前体导向生物合成,