Accepts the ubiquitin-like proteins SUMO1, SUMO2, SUMO3 and SUMO4 from the UBLE1A-UBLE1B E1 complex and catalyzes their covalent attachment to other proteins with the help of an E3 ligase such as RANBP2 or CBX4. Necessary for sumoylation of FOXL2 and KAT5. Essential for nuclear architecture and chromosome segregation
[1]"Identification of the structural and functional human homolog of the yeast ubiquitin conjugating enzyme UBC9."Yasugi T., Howley P.M.Nucleic Acids Res. 24:2005-2010(1996) [2]"Assignment of the gene for a ubiquitin-conjugating enzyme (UBE2I) to human c