NCIt definition : SUMO-activating enzyme is comprised of SUMO-activating enzyme subunits 1 (SAE1) and
2 (UBA2). This protein complex modifies the C-terminus of SUMO-1 and transfers the
SUMO group to SUMO-conjugating enzyme UBC9. This promotes the SUMOylation of target
proteins. Modification with SUMO regulates the localization and stability of the target
protein.;