Isolation and Characterization of Two Novel Antibacterial Cyclic Hexapeptides from Streptomyces alboflavus 313
作者:Zhiqin Ji、Gang Qiao、Shaopeng Wei、Lixia Fan、Wenjun Wu
DOI:10.1002/cbdv.201100364
日期:2012.8
Two novel cyclic hexapeptides, designated NW‐G08 (1) and NW‐G09 (2), were isolated from the fermentation broth of Streptomyces alboflavus 313. Their structures were elucidated on the basis of extensive spectroscopic analysis, MS experiments, and chemical analysis. Their antibacterial activities against several strains of bacteria were evaluated by micro‐broth dilution method. NW‐G08 (1) and NW‐G09
从 Streptomyces alboflavus 313 的发酵液中分离出两种新的环状六肽,命名为 NW-G08 (1) 和 NW-G09 (2)。基于广泛的光谱分析、MS 实验和化学分析阐明了它们的结构。通过微量肉汤稀释法评估它们对几种细菌的抗菌活性。NW-G08 (1) 和 NW-G09 (2) 对革兰氏阳性菌具有高度抗菌作用,但对革兰氏阴性菌无活性。1 对蜡样芽孢杆菌、枯草芽孢杆菌和金黄色葡萄球菌的最小抑制浓度 (MIC) 分别为 6.25、6.25 和 1.56 μg/ml。值得注意的是,1和2对耐甲氧西林金黄色葡萄球菌(MRSA)的活性比氨苄西林高得多,