Dual-specificity phosphatase (DUSP) (DUSP)

Dual-specificity phosphatases (DUSPs) are a heterogeneous group of enzymes within the protein tyrosine phosphatase (PTP) superfamily that possess the unique ability to dephosphorylate both phosphotyrosine and phosphoserine/phosphothreonine residues on a single substrate [UniProt: PTP superfamily]. They serve as the primary negative regulators of the Mitogen-Activated Protein Kinase (MAPK) signaling pathways, including the extracellular signal-regulated kinase (ERK), c-Jun N-terminal kinase (JNK), and p38 pathways [PMID: 19133887]. By controlling the magnitude, duration, and subcellular localization of MAPK activation, DUSPs play a pivotal role in governing fundamental cellular processes such as proliferation, differentiation, apoptosis, and the immune response [PMID: 23301656]. In various diseases, particularly cancer and chronic inflammatory conditions, DUSP expression is often dysregulated, contributing to aberrant signaling and disease progression [PMID: 16888130]. Consequently, DUSPs have emerged as attractive therapeutic targets for drug development, with several small-molecule inhibitors like BCI and TPI-1 being investigated in preclinical models to restore signaling balance [PMID: 29461815]. However, the high degree of structural conservation within the DUSP catalytic domain presents significant challenges for achieving the isoform selectivity required for clinical safety and efficacy [PMID: 29461815].

Other names

Dual-specificity protein phosphataseMAP kinase phosphataseMKPVH1-like phosphatase

Small molecule inhibition of the catalytic activity of dual-specificity phosphatases, typically through competitive binding at the active site or allosteric inhibition, which prevents the dephosphorylation of MAP kinases (ERK, JNK, p38) and maintains their active, phosphorylated state [PMID: 29461815].