You can find more information about Imp1 using the following links:

PFID PFID Old Formal Annotation PlasmoDB TDR Targets Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_1320400 PF13_0118 type I signal peptidase PlasmoDB TDR
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System