3I2D CRYSTAL STRUCTURE OF S. CEREVISIAE SUMO E3 LIGASE SIZ1 LIGASE, SUMO, SIGNAL TRANSDUCTION, REPLICATION, RING E3, PIAS, SIZ, UBIQUITIN, UBC9, CYTOPLASM, METAL-BINDING, NUCLEUS, PHOSPHOPROTEIN, UBL CONJUGATION, UBL CONJUGATION PATHWAY, ZINC, ZINC-FINGER