Tyrosine-protein phosphatase non-receptor type 4 (PTPN4)

Tyrosine-protein phosphatase non-receptor type 4 (PTPN4) is a member of the protein tyrosine phosphatase family, acting as a signaling molecule regulating cell growth, differentiation, cell cycle, and transformation[1][4]. It has a C-terminal phosphatase domain and an N-terminal region related to the band 4.1 superfamily, suggesting links to cytoskeletal association[1][3]. PTPN4 interacts with subunits of glutamate receptors and is believed to modulate synaptic and cytoskeletal signaling through tyrosine dephosphorylation[1]. Genetic and functional studies suggest PTPN4 and related PTPs are essential for normal cellular homeostasis, and their dysregulation is involved in the onset of diseases such as cancer[2][4]. Structural analysis reveals diversity among phosphatases relevant for inhibitor design, but PTPN4-specific drug development is still at a preclinical stage[3].

Other names

PTPN4MEGPTPase-MEG1PTPMEGProtein-tyrosine phosphatase MEG1Megakaryocyte phosphataseMegakaryocyte protein-tyrosine phosphatasePTPMEG1

Potential mechanisms center on inhibition of enzymatic activity by small molecules (e.g., targeting the active site) Modulation of substrate or secondary binding pockets, as revealed by structural studies[3][2]