A small organic compound enhances the religation reaction of human topoisomerase I and identifies crucial elements for the religation mechanism

被引:7
作者
Arno, Barbara [1 ]
Coletta, Andrea [1 ]
Tesauro, Cinzia [1 ]
Zuccaro, Laura [1 ]
Fiorani, Paola [2 ]
Lentini, Sara [3 ]
Galloni, Pierluca [3 ]
Conte, Valeria [3 ]
Floris, Barbara [3 ]
Desideri, Alessandro [1 ]
机构
[1] Univ Roma Tor Vergata, Dept Biol, I-00133 Rome, Italy
[2] CNR, Inst Translat Pharmacol, I-00133 Rome, Italy
[3] Dept Chem Sci & Technol, I-00133 Rome, Italy
关键词
camptothecin; molecular docking; religation rate; topoisomerase I; LINKER DOMAIN; CAMPTOTHECIN; SENSITIVITY; POLY(ADP-RIBOSE); INHIBITION; CLEAVAGE; CELLS;
D O I
10.1042/BSR20120118
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The different steps of the human Top1 (topoisomerase I) catalytic cycle have been analysed in the presence of a pentacyclic-diquinoid synthetic compound. The experiments indicate that it efficiently inhibits the cleavage step of the enzyme reaction, fitting well into the catalytic site. Surprisingly the compound, when incubated with the binary topoisomerase-DNA cleaved complex, helps the enzyme to remove itself from the cleaved DNA and close the DNA gap, increasing the religation rate. The compound also induces the religation of the stalled enzyme-CPT (camptothecin)-DNA ternary complex. Analysis of the molecule docked over the binary complex, together with its chemical properties, suggests that the religation enhancement is due to the presence on the compound of two oxygen atoms that act as hydrogen acceptors. This property facilitates the deprotonation of the 5' DNA end, suggesting that this is the limiting step in the topoisomerase religation mechanism.
引用
收藏
页码:269 / U406
页数:13
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