New Polyphenols from a Deep Sea Spiromastix sp. Fungus, and Their Antibacterial Activities
作者:Siwen Niu、Dong Liu、Peter Proksch、Zongze Shao、Wenhan Lin
DOI:10.3390/md13042526
日期:——
Eleven new polyphenols namely spiromastols A–K (1–11) were isolated from the fermentation broth of a deep sea-derived fungus Spiromastix sp. MCCC 3A00308. Their structures were determined by extensive NMR data and mass spectroscopic analysis in association with chemical conversion. The structures are classified as diphenyl ethers, diphenyl esters and isocoumarin derivatives, while the n-propyl group in the analogues is rarely found in natural products. Compounds 1–3 exhibited potent inhibitory effects against a panel of bacterial strains, including Xanthomanes vesicatoria, Pseudomonas lachrymans, Agrobacterium tumefaciens, Ralstonia solanacearum, Bacillus thuringensis, Staphylococcus aureus and Bacillus subtilis, with minimal inhibitory concentration (MIC) values ranging from 0.25 to 4 µg/mL. The structure-activity relationships are discussed, while the polychlorinated analogues 1–3 are assumed to be a promising structural model for further development as antibacterial agents.
从深海源真菌 Spiromastix sp. MCCC 3A00308 的发酵液中分离出了 11 种新的多酚,即螺旋藻多酚 A-K(1-11)。 通过大量核磁共振数据和质谱分析以及化学转换,确定了它们的结构。这些化合物的结构被归类为二苯醚、二苯基酯和异香豆素衍生物,而类似物中的正丙基在天然产物中很少发现。化合物 1-3 对一系列细菌菌株具有强效抑制作用,包括黄腐菌、拉氏假单胞菌、农杆菌、茄属拉氏菌、苏云金芽孢杆菌、金黄色葡萄球菌和枯草芽孢杆菌,最小抑菌浓度 (MIC) 值为 0.25 至 4 µg/mL。本文讨论了这些化合物的结构-活性关系,并认为多氯类似物 1-3 是一种很有前途的结构模型,可进一步开发为抗菌剂。