• YAKHAK HOEJI
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• v.49 no.5
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• pp.428-436
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• 2005

DNA topoisomerase I(TOP1) helps the control of DNA replication, transcription and recombination by assist­ing breaking and rejoining of DNA double strand. Camptothecin (CPT) and its derivative, topotecan, are known to inhibit TOP1 by intercalating into TOP1-DNA complex. Recently various non-CPT intercalators are synthesized for a new class of TOP1 inhibitors. In this study, six compounds isolated from Poria cocos were investigated for their interaction with TOP1­DNA complex using the flexible docking program, FlexiDock. The binding modes were analyzed and compared with the TOP1 inhibition activities. The compounds that showed potent activity were intercalated between the + 1/-1 base pairs of DNA, located near the active site phosphotyrosine723 and formed hydrogen bonds with active site residues. On the other hand, compounds with no activity were not docked at all. The binding modes were well correlated with the inhibition activity, suggesting the possibility that potent inhibitors can be designed from the information presented by the docking study.

• The Korean Journal of Mycology
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• v.19 no.1
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• pp.54-60
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• 1991

In the traditional medicine, the basidiocarps of Poria cocos (Fr.) Wolf naturally collec­ted have been widely used as a traditional remedy for dropsy, diarrhea, gonorrhea and nervous disease more than 3500 years ago. It was recently found to be composed of the particular compounds having antitumor effects. Therefore, its demand has been gradually increased, whereas it is still dependent upon the natural harvest. The artificial cultivation of P. cocos was carried out to observe the morphological characteristics and to investigate the cultural characteristics of P. cocos isolates collected. The morphological characteristics of its basidiocarps was observed. The physiological aspects of its isolates were also investigated.