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Diversity and chemical fingerprinting of endo-metabolomes from endophytes associated with Ampelopsis grossedentata (Hand.-Mazz.) W. T. Wang possessing antibacterial activity against multidrug resistant bacterial pathogens

文献类型： 外文期刊

作者： Lia, Yu 1 ; Kumar, Pachaiyappan Saravana 1 ; Tan, Quansheng 2 ; Tan, Xuhui 1 ; Yuan, Mingyuan 1 ; Luo, Jianqiong 3 ; He, Meijun 1 ;

作者机构： 1.Hubei Acad Agr Sci, Inst Chinese Herbal Med, 253 Xueyuan Rd, Enshi 445000, Peoples R China

2.Enshi Cent Hosp, 158,Wuyang Rd, Enshi 445000, Peoples R China

3.Enshi Selenium Commander & Ecol Agr Co, Xinyuan Bldg,Gold Rd, Enshi 445000, Peoples R China

关键词： Endophytic fungi; Alternaria alternata TC-11; Antibacterial potential; Secondary metabolites; GC-MS; LC-Q-TOF-MS/MSa

期刊名称：JOURNAL OF INFECTION AND PUBLIC HEALTH （ 影响因子：7.537； 五年影响因子：6.214 ）

ISSN： 1876-0341

年卷期： 2021 年 14 卷 12 期

页码：

收录情况： SCI

摘要： Background: Serious infections caused by bacteria and their resistance to antibiotics are one of the biggest healthcare threats to mankind. Therefore, the present study aimed to isolate endophytes from medicinal plant Ampelopsis grossedentata, an endemic species of Western Hubei, China and to investigate its antibacterial efficacy and chemical diversity of the secondary metabolites. Methods: The antibacterial potential of the endophytes was evaluated by disc diffusion method against a panel of eleven type strains and some multidrug resistant pathogenic bacteria. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were estimated by broth microdilution using iodonitrotetrazolium chloride assay. Further, the chemical diversity of the metabolites was estimated using LC-Q-TOF-MS/MS and GC-MS fingerprinting. Results: Four endophytic fungi were isolated from the tender shoot of A. grossedentata; they were identified as Fusarium graminearum TC-1, Phomopsis mali TC-3, Pestalotiopsis maculans TC-5 and Alternaria alternata TC-11. Among the endophytes screened, A. alternata TC-11 exhibited significant antibacterial activity with the zones of inhibition ranging from 13.72 +/- 0.30 to 21.76 +/- 0.53 mm against all the tested type strains and multidrug resistant bacterial pathogens. Further, it showed significant antibacterial activity with MIC values ranging from 0.37 to 3.00 mu g/mL. The combined LC-Q-TOF-MS/MS and GC-MS analyses of active extract revealed that alternarian acid, altertenuol, dimethyl sulfone, docosane, dodecane, duclauxin, ergosta-4,6,8(14),22-tetraen-3-one, ethyl 6-cyano-5-oxo1-phenyl-7-thiophen-2-yl-[1,2,4]triazolo[4,3-a]pyrimidine-3-carboxylate, heptacosane, linoleic acid, neodecanoic acid, oxiranylmethyl ester, pentadecane, verrulactone E, 2,6,11-Trimethyldodecane and 4[(E,4R,6R)-11-(furan-3-yl)-6-hydroxy-4,8-dimethylundec-8-enyl]-2-hydroxy-2H-furan-5-one were the most abundant compounds present which were responsible for the significant antibacterial activity. Conclusions: To our knowledge, this is the first report of fungal endophytes isolated from the tender shoot of A. grossedentata with bacteriostatic and bactericidal activities. Our finding provides a new insight into the antibacterial potential of endophytes and envisages the possibility of using them for drug discovery. (C) 2021 The Authors. Published by Elsevier Ltd on behalf of King Saud Bin Abdulaziz University for Health Sciences.

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