A library of 197 endophytic fungi and bacteria isolated from the Amazonian palm tree Astrocaryum sciophilum was extracted and screened for antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). Four out of five antibacterial ethyl acetate extracts were also cytotoxic for the MRC-5 cells line. Liquid chromatography coupled to tandem mass spectrometry (UPHLC-HRMS/MS) analyses combined with molecular networking data processing were carried out to allow the identification of depsipeptides and cyclopeptides responsible for the cytotoxicity in the dataset. Specific ion clusters from the active Luteibacter sp. extract were also highlighted using an MRSA activity filter. A chemical study of Luteibacter sp. was conducted leading to the structural characterization of eight fatty acid exhibiting antimicrobial activity against MRSA in the tens of µg/mL range.
从亚马逊棕榈树Astrocaryum sciophilum中分离出的197株内生真菌和细菌库被提取并筛选其对
甲氧西林耐药
金黄色葡萄球菌(MRSA)的抗菌活性。其中五个抗菌
乙酸乙酯提取物中有四个对MRC-5
细胞系也具有细胞毒性。采用
液相色谱-高分辨质谱(
UPHLC-HRMS/MS)分析,结合分子网络数据处理,可确定引起数据集细胞毒性的依赖肽和环肽。利用MRSA活性过滤器,还突出了活性Luteibacter sp.
提取物中的特定离子簇。对Luteibacter sp.的
化学研究导致了8种
脂肪酸的结构表征,这些
脂肪酸在十几微克/毫升的范围内对MRSA具有抗菌活性。