Hydrolase that deubiquitinates target proteins such as the receptor ADORA2A, PDPK1 and TRIM21. Deubiquitination of ADORA2A increases the amount of functional receptor at the cell surface. Plays a role in the regulation of quality control in the ER. Interacts with RB1 (both dephosphorylated and hypophosphorylated forms). Interacts with ADORA2A (via cytoplasmic C-terminus); the interaction is direct. Interacts with RB1, RBL1 and RBL2. Overexpressed in small cell tumors and adenocarcinomas of the lung compared to wild-type lung. Expressed in the hippocampal neurons. Belongs to the peptidase C19 family. USP4 subfamily. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Protease; Ubiquitin conjugating system; Ubiquitin-specific protease; EC 18.104.22.168
Molecular Function: identical protein binding; protein binding; cysteine-type endopeptidase activity; metal ion binding; ubiquitin-specific protease activity; adenosine receptor binding
Biological Process: assembly of spliceosomal tri-snRNP; proteasomal ubiquitin-dependent protein catabolic process; protein deubiquitination; regulation of protein stability; negative regulation of protein ubiquitination
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.