%0 Journal Article %T Noncovalent interaction between Ubc9 and SUMO promotes SUMO chain formation %A Knipscheer, Puck %A van Dijk, Willem J %A Olsen, Jesper V %A Mann, Matthias %A Sixma, Titia K %J The EMBO Journal %V 26 %N 11 %P 2797-2807 %@ 0261-4189 %D 2007-06-06 %I Nature Publishing Group UK %~ DeepDyve