UBR-box found in RING-type E3 ubiquitin-protein ligase UBR4 and similar proteins
UBR4 (EC 2.3.2.27; also called 600 kDa retinoblastoma protein-associated factor, N-recognin-4, retinoblastoma-associated factor of 600 kDa, RBAF600, p600, or zinc finger UBR1-type protein 1) is a RING-type E3 ubiquitin ligase of the Arg/N-end rule degradation pathway. It recognizes and binds to proteins bearing specific N-terminal residues that are destabilizing according to the N-end rule, leading to their ubiquitination and subsequent degradation. UBR4 acts as a multifunctional protein with roles in anoikis, viral transformation, and protein degradation, as well as in neurogenesis, neuronal migration, neuronal signaling, and survival.
Jiyao W et al.(2023). "The conserved domain database in 2023.",