Tyrosine-protein phosphatase non-receptor type 12 (PTPN12)

Tyrosine-protein phosphatase non-receptor type 12 (PTPN12) is an enzyme in the protein tyrosine phosphatase (PTP) family, functioning in key cellular signaling pathways that regulate cell growth, differentiation, and cytoskeletal organization[1][2][3]. PTPN12 dephosphorylates multiple protein targets including oncogenic tyrosine kinases (e.g., c-ABL, HER2, EGFR) and structural/cell adhesion proteins such as p130Cas and paxillin, thereby controlling cell migration, adhesion, and survival[1][2][3]. It acts as a tumor suppressor in various cancers, with loss or disruption of PTPN12 leading to deregulated cellular proliferation and increased tumor invasiveness. The protein contains a C-terminal PEST motif important for protein-protein interactions and intracellular stability, participates in modulation of Rho GTPase activity, and is regulated through alternative splicing, posttranslational modifications, and interaction with microRNAs[2]. **Note:** No small molecule inhibitors or drugs are currently approved that target PTPN12 directly. Its loss or reduced function is associated with poor prognosis in several cancer types[2].

Other names

PTP-PESTPTPG1Protein-tyrosine phosphatase G1

Potential therapeutic strategy involves inhibition or modulation of PTPN12 phosphatase activity, though no approved drugs directly target PTPN12 yet.