PTP1B (PTPN1) is a tyrosine-protein phosphatase which acts as a regulator of endoplasmic reticulum unfolded protein response. It mediates dephosphorylation of EIF2AK3/PERK and in turn inactivates the protein kinase activity of EIF2AK3/PERK. PTP1B also plays a role in CKII- and p60c-src-induced signal transduction cascades. It regulates the EFNA5-EPHA3 signaling pathway which modulates cell reorganization and cell-cell repulsion. PTP1B also regulates the hepatocyte growth factor receptor signaling pathway through dephosphorylation of MET.
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Protein Aliases: EC 18.104.22.168; hgnc9642; KIAA0283; protein tyrosine phosphatase, placental; protein-protein-tyrosine phosphatase HA2; Protein-tyrosine phosphatase 1B; Protein-tyrosine phosphatase HA2; PTN1; PTP-1B; PTP-HA2; RP5-1121H13.2; RPTPrho; tyrosine phosphatase 1b; tyrosine-phosphatase; Tyrosine-protein phosphatase non-receptor type 1
Gene Aliases: Ptp; PTP-1B; PTP-HA2; PTP1B; PTPN1