You can find more information about Topoisomerase I using the following links:

PFID PFID Old Formal Annotation PlasmoDB TDR Targets Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_0510500 PFE0520c topoisomerase I PlasmoDB TDR
Camptothecin
Peptide wrwycrck
Topotecan
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System