UniProt functional annotation for P04157

UniProt code: P04157.

Organism:		Rattus norvegicus (Rat).
Taxonomy:		Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae; Murinae; Rattus.
Function:		Protein tyrosine-protein phosphatase required for T-cell activation through the antigen receptor. Acts as a positive regulator of T-cell coactivation upon binding to DPP4. The first PTPase domain has enzymatic activity, while the second one seems to affect the substrate specificity of the first one. Upon T-cell activation, recruits and dephosphorylates SKAP1 and FYN (By similarity). Dephosphorylates LYN, and thereby modulates LYN activity (By similarity). {ECO:0000250}.
Catalytic activity:		Reaction=H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate; Xref=Rhea:RHEA:10684, Rhea:RHEA-COMP:10136, Rhea:RHEA- COMP:10137, ChEBI:CHEBI:15377, ChEBI:CHEBI:43474, ChEBI:CHEBI:46858, ChEBI:CHEBI:82620; EC=3.1.3.48; Evidence={ECO:0000255|PROSITE- ProRule:PRU10044};
Subunit:		Interacts with SKAP1. Interacts with DPP4; the interaction is enhanced in an interleukin-12-dependent manner in activated lymphocytes. Binds GANAB and PRKCSH (By similarity). {ECO:0000250}.
Subcellular location:		Cell membrane {ECO:0000250|UniProtKB:P08575}; Single-pass type I membrane protein {ECO:0000255}. Membrane raft {ECO:0000250|UniProtKB:P08575}. Note=Colocalized with DPP4 in membrane rafts. {ECO:0000250|UniProtKB:P08575}.
Tissue specificity:		Isoform 1 and isoform 2 are found in thymocyte and lymph node. Isoform 4 and isoform 3 are found in the lymph nod.
Domain:		The first PTPase domain interacts with SKAP1. {ECO:0000250}.
Ptm:		Heavily N- and O-glycosylated.
Ptm:		The cytoplasmic domain contains potential phosphorylation sites.
Similarity:		Belongs to the protein-tyrosine phosphatase family. Receptor class 1/6 subfamily. {ECO:0000305}.

Annotations taken from UniProtKB at the EBI.