PTPRJ
Function
Tyrosine phosphatase which dephosphorylates or contributes to the dephosphorylation of CTNND1, FLT3, PDGFRB, MET, KDR, LYN, SRC, MAPK1, MAPK3, EGFR, TJP1, OCLN, PIK3R1 and PIK3R2 (PubMed:10821867, PubMed:12062403, PubMed:12370829, PubMed:12475979, PubMed:18348712, PubMed:19494114, PubMed:19922411, PubMed:21262971). Plays a role in cell adhesion, migration, proliferation and differentiation (PubMed:12370829, PubMed:14709717, PubMed:16682945, PubMed:19836242). Has a role in megakaryocytes and platelet formation (PubMed:30591527). Involved in vascular development (By similarity). Regulator of macrophage adhesion and spreading (By similarity). Positively affects cell-matrix adhesion (By similarity). Positive regulator of platelet activation and thrombosis. Negative regulator of cell proliferation (PubMed:16682945). Negative regulator of PDGF-stimulated cell migration; through dephosphorylation of PDGFR (PubMed:21091576). Positive regulator of endothelial cell survival, as well as of VEGF-induced SRC and AKT activation; through KDR dephosphorylation (PubMed:18936167). Negative regulator of EGFR signaling pathway; through EGFR dephosphorylation (PubMed:19836242). Enhances the barrier function of epithelial junctions during reassembly (PubMed:19332538). Negatively regulates T-cell receptor (TCR) signaling (PubMed:11259588, PubMed:9531590, PubMed:9780142). Upon T-cell TCR activation, it is up-regulated and excluded from the immunological synapses, while upon T-cell-antigen presenting cells (APC) disengagement, it is no longer excluded and can dephosphorylate PLCG1 and LAT to down-regulate prolongation of signaling (PubMed:11259588, PubMed:12913111).
Isoform 2
Activates angiogenesis and cell migration (PubMed:28052032). Downregulates the expression of the endothelial adhesion molecules ICAM1 and VCAM1 (PubMed:28052032).
Involvement in disease
Thrombocytopenia 10
THC10
A form of thrombocytopenia, a hematologic disorder defined by a decrease in the number of platelets in circulating blood, resulting in the potential for increased bleeding and decreased ability for clotting. THC10 is an autosomal recessive form characterized by decreased numbers of platelets apparent from birth or early childhood.
None
The disease is caused by variants affecting the gene represented in this entry.
Post-translational modifications
N- and O-glycosylated.
Isoform 2
N-glycosylated.
Sequence Similarities
Belongs to the protein-tyrosine phosphatase family. Receptor class 3 subfamily.
Tissue Specificity
Expressed in the promyelocytic cell line HL-60, the granulocyte-macrophage colony-stimulating factor-dependent leukemic cell line F-36P, and the IL3 and erythropoietin-dependent leukemic cell line F-36E. Expressed predominantly in epithelial cells and lymphocytes. Enhanced expression at high cell density.
Isoform 2
Expressed in the brain.
Cellular localization
- Cell membrane
- Single-pass type I membrane protein
- Cell projection
- Ruffle membrane
- Cell junction
- After T-cell stimulation, it is temporarily excluded from immunological synapses.
- Isoform 2
- Secreted
- Extracellular space
Alternative names
CD148, DEP1, PTPRJ, Receptor-type tyrosine-protein phosphatase eta, Protein-tyrosine phosphatase eta, R-PTP-eta, Density-enhanced phosphatase 1, HPTP eta, Protein-tyrosine phosphatase receptor type J, DEP-1, R-PTP-J