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A new hTopo I isomerase inhibitor produced by a mangrove endophytic fungus no. 2240

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A new hTopo I isomerase inhibitor, (+)-3,3',7,7',8,8'-hexahydroxy-5,5'-dimethylbianthraquinone (2240A), was isolated from the mangrove endophytic fungus no. 2240 collected from an estuarine mangrove at the South China Sea coast. Its structure was elucidated by spectral analyses including two-dimensional NMR, HR-EI-MS, IR, and UV. The hTopo I isomerase inhibition experiment showed that 2240A (1) possessed strong inhibiting activity. When its inhibition concentration was 4.65 mol/l, its percent inhibition rate was 59.1%, while the lowest inhibition concentration of the positive control camptothecin was 1.00 × 103 mol/l.
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Keywords: (+)-3,3',7,7',8,8'-hexahydroxy-5,5'-dimethylbianthraquinone; 2240A; hTopo I isomerase inhibitor; mangrove endophytic fungus

Document Type: Research Article

Affiliations: 1: School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, China,Department of Chemistry and Biology, Xiangnan University, Chenzhou, Hunan, China 2: School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou, China 3: School of Life Science, Zhongshan University, Guangzhou, China 4: Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China

Publication date: July 1, 2008

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