期刊
PHYTOCHEMISTRY
卷 100, 期 -, 页码 103-109出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2014.01.003
关键词
Lasiodiplodia pseudotheobromae; Illigera rhodantha; Hernandiaceae; Lasiodipline; Antibacterial; Sulfureous diketopiperazine; Structure elucidation
资金
- MOST [2013AA092901]
- NSFC [81121062, 21132004, 21072092]
- NSFJHEI [11KJB350003]
In searching for symbionts derived from bioactive natural products, six sulfureous diketopiperazines designated as lasiodiplines A-F (1-6) were characterized from the culture of Lasiodiplodia pseudotheobromae F2, previously residing in the apparently normal flower of Illigera rhodantha (Hemandiaceae). Identification of structures was accomplished by a combination of spectroscopic and computational approaches, in conjunction with the low-temperature (100 K) single-crystal X-ray diffraction with Cu K alpha radiation. Lasiodipline E (5) was demonstrated to be antibacterial against the clinical strains Streptococcus sp., Bacteroides vulgates, Peptostreptococcus sp. and Veillonella parvula, respectively, with an minimum inhibitory concentration (MIC) range of 0.12-0.25 mu g/mL. In addition, compounds 4 and 6 exemplify two unusual architectures of natural cyclodipeptides, signifying the unique biochemical characteristics of the producing fungus. (C) 2014 Elsevier Ltd. All rights reserved.
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