Receptor-type tyrosine-protein phosphatase gamma (PTPRG)

Receptor-type tyrosine-protein phosphatase gamma (PTPRG) is a **transmembrane protein tyrosine phosphatase** that contains an extracellular carbonic anhydrase-like domain, a fibronectin type III domain, and two intracellular phosphatase domains—one catalytically active and one inactive. PTPRG is widely expressed in human tissues including the nervous system, epithelium, hematopoietic cells, and others. Its primary biological role is **signal transduction and cell adhesion**, primarily by modulating phosphorylation states of tyrosine residues on key proteins, counteracting the activity of tyrosine kinases and regulating cell growth, proliferation, differentiation, and adhesion. It functions as a tumor suppressor gene and is frequently lost or silenced in various cancers, where its normal activity restrains oncogenic signaling pathways (such as BCR–ABL1 and FGFR1). Additionally, PTPRG has emerging roles in neuronal development, neuropsychiatric diseases, and inflammation. The soluble form (sPTPRG) is being investigated as a biomarker for inflammatory conditions and tissue integrity[1][3][4][5][6][7].

Other names

PTPRGProtein-tyrosine phosphatase gammaR-PTP-gammaRPTPGHPTPGProtein tyrosine phosphatase receptor type GPTPGH_RG317H01.1Receptor-type protein phosphatase gammaReceptor tyrosine phosphatase gammaProtein tyrosine phosphatase, receptor type, gamma polypeptideReceptor-type protein tyrosine phosphatase gamma[6][7]

For hypothetical drugs or ligands: inhibition or modulation of phosphatase activity; restoration of tumor suppressor function; dephosphorylation of substrate tyrosine residues on target proteins (oncogenic kinases and adhesion molecules)[1][3][6] Drugs affecting upstream or downstream signaling could alter PTPRG's regulatory effects.