Mechanisms of camptothecin resistance by human topoisomerase I mutations
Chrencik, J.E., Staker, B.L., Burgin, A.B., Pourquier, P., Pommier, Y., Stewart, L., Redinbo, M.R.(2004) J Mol Biol 339: 773-784
- PubMed: 15165849 
- DOI: 10.1016/j.jmb.2004.03.077
- Primary Citation of Related Structures:  
1RR8, 1RRJ - PubMed Abstract: 
Human topoisomerase I relaxes superhelical tension associated with DNA replication, transcription and recombination by reversibly nicking one strand of duplex DNA and forming a covalent 3'-phosphotyrosine linkage. This enzyme is the sole target of the camptothecin family of anticancer compounds, which acts by stabilizing the covalent protein-DNA complex and enhancing apoptosis through blocking the advancement of replication forks ...