Tetramic Acids and Pyridone Alkaloids from the Endolichenic Fungus Tolypocladium cylindrosporum

Tetramic Acids and Pyridone Alkaloids from the Endolichenic Fungus Tolypocladium cylindrosporum
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内生真菌 Tolypocladium cylindrosporum 中的特特拉姆酸和吡啶酮生物碱

DOI:
10.1021/np501018w
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发表时间:
2015-09-01
影响因子:
5.1
通讯作者:
Lou, Hong-Xiang
Lou, Hong-Xiang
中科院分区:
生物学2区
文献类型:
--
作者:
Li, Xiao-Bin;Li, Lin;Lou, Hong-Xiang

文献摘要

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从寄生于地衣雀儿石蕊(Lethariella zahlbruckneri)的内生真菌柱孢虫草菌(Tolypocladium cylindrosporum)中分离得到3种新的四氮杂酸衍生物,分别为毛盘孢醇A(1)、A(2)和B(1 - 3),1种新的吡啶酮生物碱,毛盘孢吡啶酮A(4),以及1种新的香豆素衍生物,3,8 - 二羟基 - 4 -(4 - 羟基苯基) - 6 - 甲基香豆素(5),同时还得到4种已知化合物(6 - 9)。通过对光谱数据的综合分析以及单晶X射线衍射测定确定了这些化合物的结构。对分离得到的化合物进行生物活性测定发现,吡哆醇(7)通过诱导G0/G1细胞周期阻滞和细胞凋亡对人类癌细胞具有细胞毒性。
Three new tetramic acid derivatives, tolypodadenols A(1), A(2), and B (1-3), a new pyridone alkaloid, tolypyridone A (4), and a new coumarin derivative, 3,8-dihydroxy-4-(4-hydroxyphenyl)-6-methylcoumarin (5), together with four known compounds (6-9) were isolated from the endolichenic fungus Tolypocladium cylindrosporum, which inhabits the lichen Lethariella zahlbruckneri. Structures of these compounds were determined by comprehensive analysis of spectroscopic data and single-crystal X-ray diffraction determination. Bioassay of the isolated compounds found that pyridoxatin (7) was cytotoxic to human cancer cells by induction of G0/G1 cell cycle arrest and apoptosis.