期刊
TETRAHEDRON LETTERS
卷 61, 期 40, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2020.152322
关键词
Aspergillus candidus; Cyclic heptapeptide; Unguisin; Structure elucidation
资金
- MOST [2018YFC1706200, 2019YFC0312500, 2018YFA0902000]
- NSFC [81925033, 21861142005, 81773591, 81673333, 81803380, 2171101213]
- Fundamental Research Funds for the Central Universities [14380092, 14380113, 143801389]
One new cyclic heptapeptide containing non-proteinogenic amino acid residues kynurenine and gamma-aminobutyric acid, named unguisin G, as well as three known congeners unguisins A, E and F, were isolated from a sponge-derived fungus Aspergillus candidus NF2412. The structures were elucidated by comprehensive spectroscopic analyses of HRESIMS and NMR data. The absolute configuration of amino acid residues of 1 was determined by advanced Marfey's method. All compounds were evaluated on antimicrobial activities against nine pathogens by the agar diffusion method. (C) 2020 Elsevier Ltd. All rights reserved.
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