Background:
OTUB1 belongs to the ovarian tumor domain protease (OTU) subfamily of deubiquitinases, which could block ubiquitination leading to protein stability. OTUB1 mainly prefers k-48 and k-63 ubiquitin chains type, especially in k-48 ubiquitin chain. OTUB1 performs its deubiquitinating function via two distinct manners: the canonical and non-canonical manner. OTUB1 is involved in many critical immune response processes, containing CD8 T cell activation, PD-L1 related immune evasion, and several infectious diseases.