Eight new isocoumarin glycosides (1-8) were obtained from the solid culture of the wetland soil-derived fungus Metarhizium anisopliae (No. DTH12-10). Their chemical structures were elucidated by analyses of HR ESI-TOF MS, (1)H, (13)C NMR, (1)H-(1)H COSY, HSQC, and HMBC spectra. The absolute configurations were determined by single crystal X-ray diffraction, circular dichroism (CD) spectrum, and chemical derivatization methods. In addition, inhibition of the biofilm formation and the secretion of virulence factor of the new isocoumarin glycosides against Pseudomonas aeruginosa strain PAOA (clinical isolates) were evaluated. The result revealed that compound 1 showed antibacterial activity comparable with (Z)-4-bromo-5-(bromomethylene)-2(5H)-furanone (BF).
3, antibacterial activity, chemical constituents, 4-dihydroisocoumarin glycoside, biofilm inhibitory activity, metarhizium anisopliae, virulence factor secretion
NCBI PubMed ID: 26848110Publication DOI: 10.1016/j.bmcl.2016.01.074Journal NLM ID: 9107377Publisher: Elsevier
Correspondence: Tang JS
; Yao XS
Institutions: State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China, Institute of Traditional Chinese Medicine and Natural Products, College of Pharmacy, Jinan University, Guangzhou, China, Department of Urology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan, College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China, Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou, China
Methods: 13C NMR, 1H NMR, IR, X-ray, UV, CD, determination of absolute configuration, HMBC, COSY, HSQC, HR ESI-TOF MS