Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/5AIU 5AIU: A complex of RNF4-RING domain, Ubc13-Ub (isopeptide crosslink) E3 UBIQUITIN-PROTEIN LIGASE RNF4POLYUBIQUITIN-CUBIQUITIN-CONJUGATING ENZYME E2 N1,2-ETHANEDIOLZINC ION complex