You can find more information about SUMO ligase using the following links:

PFID PFID Old Formal Annotation GeneDB PlasmoDB Subcellular Localization Affecting Drugs
Drug Name PubMed Articles (year of publication)
PF3D7_1360700 MAL13P1.302 E3 SUMO-protein ligase PIAS, putative GeneDB PlasmoDB
Expasy - NiceZime View
Brenda - The Comprehensive Enzyme Information System