You can find more information about ubiquitin-activating enzyme E1 using the following links:

PFID PFID Old Formal Annotation PlasmoDB TDR Targets Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_1225800 PFL1245w ubiquitin-activating enzyme E1 PlasmoDB TDR
Eeyarestatin i
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System