期刊
MARINE DRUGS
卷 17, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/md17120652
关键词
marine cyanobacterium; Lyngbya sp; aplysiatoxin; stereoisomers; Kv1; 5 inhibitory activity
资金
- National Natural Science Foundation of China [81973233, 81373321]
- Natural Science Foundation of Zhejiang Province [Y2100044]
- Special Program for Research and Development of Zhejiang Sci-Tech University [2019Y009]
A pair of stereoisomers possessing novel structures with 6/6/5 fused-ring systems, neo-debromoaplysiatoxin E (1) and neo-debromoaplysiatoxin F (2), were isolated from the marine cyanobacterium Lyngbya sp. Their structures were elucidated using various spectroscopic techniques including high resolution electrospray ionization mass spectroscopy (HRESIMS) and nuclear magnetic resonance (NMR). The absolute stereochemistry was determined by calculated electronic circular dichroism (ECD) and gauge-independent atomic orbital (GIAO) NMR shift calculation followed by DP4+ analysis. Significantly, this is the first report on aplysiatoxin derivatives with different absolute configurations at C9-C12 (1: 9S, 10R, 11S, 12S; 2: 9R, 10S, 11R, 12R). Compounds 1 and 2 exhibited potent blocking activities against Kv1.5 with IC50 values of 1.22 +/- 0.22 mu M and 2.85 +/- 0.29 mu M, respectively.
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