Termisoflavones A–C, Isoflavonoid Glycosides from Termite-Associated Streptomyces sp. RB1

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• 作者：Hee Rae Kang ; Dahae Lee ; René Benndorf ; Won Hee Jung ; Christine Beemelmanns ; Ki Sung Kang ; Ki Hyun Kim
• 刊名：Journal of Natural Products
• 出版年：2016
• 出版时间：December 23, 2016
• 年：2016
• 卷：79
• 期：12
• 页码：3072-3078
• 全文大小：374K
• ISSN：1520-6025

文摘

Three new isoflavonoid glycosides, termisoflavones A–C (1–3), and eight isoflavonoids (4–11) were isolated from termite-associated Streptomyces sp. RB1 recovered from the cuticle of the South African termite, Macrotermes natalensis. The structures of new compounds were determined by spectroscopic methods including 1D and 2D NMR and HR-MS analysis, as well as comparison of their NMR data with those of related isoflavonoid glycoside derivatives. The absolute configurations of the sugar moieties were clarified by chemical reactions. None of the isolates (1–11) displayed antifungal or antimicrobial activities (MICs > 100 μg/mL), whereas compounds 6 and 11 ameliorated cisplatin-induced kidney cell damage to 80% of the control value at a cisplatin dose of 25 μM.