Small ubiquitin-related modifier 5 (SUMO1P1)

Ubiquitin-like protein that can be covalently attached to proteins as a monomer or as a lysine-linked polymer. Regulates the entire life cycle of promyelocytic leukemia nuclear bodies (PML-NBs).

PolySUMO1P1/SUMO5 conjugation on'Lys-160' of PML facilitates recruitment of PML-NB components, which enlarges PML-NB. SUMO1P1/SUMO5 also increases polySUMO2/3 conjugation of PML, leading to RNF4-mediated disruption of PML-NBs.