Recombinant human RING-finger 4/RNF4 protein

RING-finger 4 (RNF4), also known as Snurf, is an E3 ubiquitin ligase. RNF4 is composed of four SUMO interaction motifs (SIMs) at the N-terminal and a RING domain at the C-terminal. The SIM domains prefer binding polySUMO chains; RNF4 functions to ubiquitinate polysumolyated proteins including promyelocytic leukaemia (PML), which target them for proteasomal degradation.