Thailandins A and B, New Polyene Macrolactone Compounds Isolated from Actinokineospora bangkokensis Strain 44EHWT, Possessing Antifungal Activity against Anthracnose Fungi and Pathogenic Yeasts

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• 作者：Bungonsiri Intra ; Anja Greule ; Andreas Bechthold ; Jirayut Euanorasetr ; Thomas Paululat ; Watanalai Panbangred
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：June 29, 2016
• 年：2016
• 卷：64
• 期：25
• 页码：5171-5179
• 全文大小：470K
• 年卷期：0
• ISSN：1520-5118

文摘

Two new polyene macrolactone antibiotics, thailandins A, 1, and B, 2, were isolated from the fermentation broth of rhizosphere soil-associated Actinokineospora bangkokensis strain 44EHW^T. The new compounds from this strain were purified using semipreparative HPLC and Sephadex LH-20 gel filtration while following an antifungal activity guided fractionation. Their structures were elucidated through spectroscopic techniques including UV, HR-ESI-MS, and NMR. These compounds demonstrated broad spectrum antifungal activity against fungi causing anthracnose disease (Colletotrichum gloeosporioides DoA d0762, Colletotrichum gloeosporiodes DoA c1060, and Colletotrichum capsici DoA c1511) as well as pathogenic yeasts (Candida albicans MT 2013/1, Candida parasilopsis DKMU 434, and Cryptococcus neoformans MT 2013/2) with minimum inhibitory concentrations ranging between 16 and 32 μg/mL. This is the first report of polyene antibiotics produced by Actinokineospora species as bioactive compounds against anthracnose fungi and pathogenic yeast strains.