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NTIS 바로가기약학회지 = Yakhak hoeji, v.53 no.4, 2009년, pp.222 - 227
박인선 (이화여자대학교 약학대학 대학원 생명.약학부) , 김보연 (이화여자대학교 약학대학 대학원 생명.약학부) , 김춘미 (이화여자대학교 약학대학 대학원 생명.약학부) , 최선 (이화여자대학교 약학대학 대학원 생명.약학부)
Human topoisomerase I (Topo I) plays a pivotal role in cell replication, transcription and repair and, therefore, is an important anti-cancer target. 20S-camptothecin (CPT) is a representative Topo I inhibitor. Compounds belonging to CPT family inhibit the religation step of Topo I-DNA by binding to...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
Topoisomerase는 무엇인가? | Topoisomerase는 DNA helix의 복제, 전사, 그리고 다른 nuclear processes의 결과로 생기는 torsional stress를 경감시켜 주는 효소이다.1) 인간 topoisomerase I(Topo I)은 Tyr723의 첫번째 transesterification을 통해서 single DNA 가닥을 절단시키고 DNA와 3'-phosphotyrosine(Ptr723) 결합을 형성한다. | |
Camptothecin는 무엇인가? | Camptothecin(CPT)는 천연물로 mammalian DNA topoisomerase I을 표적으로 하여 강력한 항암활성을 나타낸다. 천연의 알칼로이드는 20S-CPT enantiomer이며, 이것이 Topo I에 대한 활성형이고 20R-CPT는 Topo I에 대한 저해 활성이 없다. | |
Camptothecin가 세포 독성을 유발하는 과정은 무엇인가? | 천연의 알칼로이드는 20S-CPT enantiomer이며, 이것이 Topo I에 대한 활성형이고 20R-CPT는 Topo I에 대한 저해 활성이 없다.11) CPT 는 Topo I-DNA 중간체를 trap함으로써 함께 안정한 삼성분 복합체(ternary structure)를 이루며 빠르게 분열하는 세포 내에서 replication fork와 충돌하고 lethal lesion에 이르게 되어 세포독성을 유발한다.12,13) DNA나 Topo I이 단독으로 있을 때는 결합 하지 않는다. |
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