E3 ubiquitin-protein ligase UBR1 (Ubr1)

E3 ubiquitin-protein ligase that is a part of the N-end rule pathway. Recognizes and binds to proteins bearing specific N-terminal residues that are destabilizing in line with the N-end rule, resulting in their ubiquitination and subsequent degradation.

May be involved in pancreatic homeostasis. Binds leucine and is a negative regulator of the leucine-mTOR signaling pathway, thereby controlling cell growth (By similarity).