{"gene":"PTPN1","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2002,"finding":"PTP1B-catalyzed dephosphorylation of receptor tyrosine kinases (EGFR and PDGFR) requires endocytosis of the receptors and occurs at specific sites on the cytoplasmic surface of the endoplasmic reticulum, demonstrating that RTK activation and inactivation are spatially and temporally partitioned within cells.","method":"Fluorescence resonance energy transfer (FRET) live-cell imaging of PTP1B–RTK interactions","journal":"Science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct FRET imaging of enzyme-substrate interactions in live cells, replicated across two RTK types, mechanistically resolves the spatial regulation of dephosphorylation","pmids":["11872838"],"is_preprint":false},{"year":2000,"finding":"PTP1B specifically dephosphorylates and deactivates prolactin-activated STAT5a and STAT5b, inhibiting their nuclear translocation and downstream transcriptional activation of the beta-casein gene promoter; substrate-trapping mutants of PTP1B co-precipitated tyrosine-phosphorylated STAT5 proteins.","method":"Substrate-trapping co-precipitation, overexpression in COS7 cells, in vitro dephosphorylation assay, retrovirus-mediated overexpression in mammary epithelial cells","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (substrate trapping, in vitro assay, cell-based overexpression with functional readout) in a single study","pmids":["10993888"],"is_preprint":false},{"year":2007,"finding":"PTP1B activity is spatially regulated across the cell, establishing a steady-state enzyme-substrate gradient; this gradient is robust to cell-to-cell variability, growth factor activation, and RTK localization, and the ER-localized enzyme allows RTK signaling in the cytoplasm while mediating eventual signal termination.","method":"FRET-based live-cell imaging of enzyme-substrate intermediates","journal":"Science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct FRET imaging of ES intermediates in live cells with quantitative gradient measurements; replicated in multiple conditions","pmids":["17204654"],"is_preprint":false},{"year":2010,"finding":"PTP1B directly interacts with and dephosphorylates EphA3 receptor, governing its signaling amplitude and duration; PTP1B interacts with EphA3 at the plasma membrane at cell-cell contacts before ligand-stimulated internalization and on endosomes after internalization, and overexpression of wild-type or substrate-trapping PTP1B decelerates EphA3 trafficking and controls its cell-surface concentration.","method":"Confocal fluorescence lifetime imaging microscopy (FLIM), overexpression of wild-type and D-A substrate-trapping mutant, EphA3 phosphorylation time-course assay","journal":"The Journal of Cell Biology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — FLIM showing direct interaction, substrate trapping, and functional phenotype (receptor trafficking) with multiple orthogonal approaches in one study","pmids":["21135139"],"is_preprint":false},{"year":2006,"finding":"ER-bound PTP1B is targeted to newly forming cell-matrix adhesion sites via dynamic ER extensions along microtubules; deletion of the ER-targeting sequence relocalizes PTP1B to the cytosol and alters its distribution at cell-matrix foci; PTP1B preferentially associates with FAK- and paxillin-containing immature focal complexes rather than zyxin-containing mature foci.","method":"GFP-PTP1B substrate-trapping mutant (D181A) live imaging, deletion mutants, co-localization with focal adhesion markers, nocodazole treatment","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — live imaging with functional mutants, domain deletions, and multiple marker co-localizations in one study","pmids":["16522684"],"is_preprint":false},{"year":2013,"finding":"PTP1B enhances focal complex lifetime, facilitates α-actinin incorporation, and contributes to lamellar protrusion persistence and directional migration; PTP1B targets the negative regulatory site of Src (pY529), paxillin, and p130Cas at peripheral cell-matrix adhesions; PTP1B is required for integrin-dependent downregulation of RhoA and upregulation of Rac1 during spreading.","method":"Kymograph analysis, pull-down, FRET, substrate-trapping mutant (D181A), FAK/Src inhibitors, active-site mutant","journal":"Journal of Cell Science","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (FRET, kymography, pull-down, pharmacological and genetic inhibition) establishing substrate identity and functional consequence","pmids":["23444382"],"is_preprint":false},{"year":2009,"finding":"In hippocampal axonal growth cones, PTP1B localizes to the central domain and peripheral region via ER extensions along microtubules; microtubule disruption by nocodazole redistributes PTP1B to the growth cone base; functional impairment of PTP1B reduces axon elongation, decreases filopodia lifetime, and diminishes Src activity in growth cones.","method":"Live imaging of GFP-PTP1B, nocodazole treatment, ER marker co-localization, functional impairment of PTP1B","journal":"Molecular Biology of the Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with functional consequence (axon elongation and Src activity), single lab, two orthogonal approaches","pmids":["19158394"],"is_preprint":false},{"year":2012,"finding":"PTP1B dephosphorylates β-catenin at Tyr-654 in N-cadherin complexes in hippocampal neurons; PTP1B deficiency leads to ~5-fold increased β-catenin pY654 and reduced N-cadherin association with β-catenin, increased filopodia-like dendritic spines, reduced mushroom spines, and disorganized pre- and post-synaptic markers; hippocampus/cortex-specific PTP1B knockout mice show improved learning and memory in the Barnes maze.","method":"PTP1B(-/-) mouse model, hippocampus/cortex-specific conditional knockout (Emx1-Cre), western blotting, immunofluorescence, Barnes maze behavioral testing","journal":"PloS One","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with substrate-level biochemical measurement and behavioral functional readout in vivo, multiple orthogonal methods","pmids":["22844492"],"is_preprint":false},{"year":2019,"finding":"PTPN1 (PTP1B) and PTPN2 associate with MITA/STING following viral infection and dephosphorylate MITA/STING at Y245; this dephosphorylation promotes MITA/STING degradation via the ubiquitin-independent 20S proteasomal pathway in an intrinsically disordered region (IDR)-dependent manner, thereby attenuating innate antiviral response.","method":"Co-immunoprecipitation, site-directed mutagenesis (Y245), proteasome inhibitor assays, PTPN1/2 deficiency with antiviral gene expression readout","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct biochemical identification of dephosphorylation site by mutagenesis, Co-IP, and genetic KO with functional antiviral readout; multiple orthogonal methods","pmids":["31527250"],"is_preprint":false},{"year":2014,"finding":"Oxidized (inactive) PTP1B is preferentially reactivated by thioredoxin 1 (TRX1) via direct thiol-disulfide exchange between the active sites; inducible depletion of TRX1 slows PTP1B reactivation in intact living cells; demonstrated by mechanism-based thioredoxin trapping mutants that directly co-immunoprecipitate with PTP1B.","method":"Mechanism-based trapping of thioredoxin–PTP1B complexes, anti-tag co-immunoprecipitation, TRX1 inducible depletion in live cells","journal":"The FEBS Journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — reconstitution-like trapping of direct thiol exchange intermediate, confirmed in live cells with functional consequence, multiple orthogonal approaches","pmids":["24976139"],"is_preprint":false},{"year":2019,"finding":"14-3-3ζ interacts with the reversibly oxidized (inactive) form of PTP1B; destabilizing this interaction prevents PTP1B inactivation by reactive oxygen species and decreases EGFR phosphorylation, establishing that the 14-3-3ζ–oxidized PTP1B complex is required for full ROS-mediated PTP1B inactivation in cells.","method":"Molecular interaction studies (co-immunoprecipitation/pulldown), phospho-EGFR readout after complex disruption, mass spectrometry","journal":"Nature Chemical Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct identification of binding partner by MS and Co-IP, functional consequence shown, single lab","pmids":["31873221"],"is_preprint":false},{"year":2019,"finding":"Bicarbonate facilitates H2O2-mediated PTP1B inactivation by forming the more reactive peroxymonocarbonate; EGF-induced cellular oxidation of PTP1B and total protein phosphotyrosine levels are completely dependent on intracellular bicarbonate concentration, linking cellular acid-base balance to PTP1B redox regulation.","method":"In vitro biochemical assays with purified recombinant PTP1B, cellular bicarbonate manipulation, EGF-stimulated A431 cells, PTP1B oxidation measurement","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro assay plus cellular validation with multiple orthogonal conditions; single lab but comprehensive","pmids":["31197039"],"is_preprint":false},{"year":2018,"finding":"A recombinant antibody (scFv45) that specifically recognizes oxidized, inactive PTP1B stabilizes it in an inactive conformation, providing proof-of-concept that small molecules mimicking scFv45 can promote insulin and leptin signaling by locking PTP1B in an oxidized state; a small molecule mimicking scFv45 was identified that reproduces this effect.","method":"Structural analysis of scFv45–oxidized PTP1B complex, small molecule screening, insulin and leptin signaling assays","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — structural/biochemical basis for inhibition mechanism established, functional validation, single lab","pmids":["29348454"],"is_preprint":false},{"year":2017,"finding":"PTP1B uses a CH/π switch (evolutionarily conserved) critical for positioning the catalytically important WPD loop, and employs both conformational and dynamic allostery to regulate its activity; these mechanisms were defined by combining NMR, crystallography, and computational data on wild-type and ≥10 PTP1B variants.","method":"NMR spectroscopy, X-ray crystallography, molecular dynamics simulations on WT and multiple PTP1B variants","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — structural and dynamics data with ≥10 mutant variants; NMR and crystal structures combined with MD; multiple orthogonal methods","pmids":["28212750"],"is_preprint":false},{"year":2020,"finding":"All four catalytically important loops of PTP1B (WPD, Q, E, and substrate-binding loops) work in dynamic unity throughout the catalytic cycle; slow N-terminal helix dynamics, fast side-chain dynamics, and μs–ms conformational exchange of all key loops are dynamically coordinated, not independent.","method":"13C-methyl ILV NMR relaxation studies, constant-time CPMG relaxation dispersion measurements","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — comprehensive NMR relaxation study with multiple time-scale measurements; single lab but rigorous multi-method NMR approach","pmids":["32737198"],"is_preprint":false},{"year":2015,"finding":"PTP1B is a negative regulator of tyrosine phosphorylation of TRKB (the BDNF receptor); elevated PTP1B in Rett syndrome models (due to MECP2 disruption, which removes MECP2-mediated repression of the PTPN1 gene) impairs BDNF/TRKB signaling; pharmacological PTP1B inhibition increases TRKB tyrosine phosphorylation in brain and improves Rett syndrome phenotypes in mice.","method":"MECP2-deficient mouse models, pharmacological PTP1B inhibition, TRKB phosphorylation western blotting, behavioral assays, ChIP/promoter analysis for MECP2 at PTPN1 locus","journal":"The Journal of Clinical Investigation","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and pharmacological inhibition with substrate-level phosphorylation readout and in vivo behavioral endpoints; multiple orthogonal approaches","pmids":["26214522"],"is_preprint":false},{"year":2014,"finding":"Somatic loss-of-function mutations in PTPN1 in Hodgkin lymphoma and PMBCL lead to reduced PTP1B phosphatase activity and increased phosphorylation of JAK-STAT pathway members; RNAi silencing of PTPN1 in Hodgkin lymphoma cells causes hyperphosphorylation of downstream oncogenic targets, establishing PTP1B as a negative regulator of JAK-STAT signaling in these lymphomas.","method":"Whole-genome and whole-transcriptome sequencing, phosphatase activity assays on mutant proteins, RNA interference in Hodgkin lymphoma cell lines, phospho-western blotting","journal":"Nature Genetics","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — enzymatic activity assays on mutants combined with RNAi and phosphoprotein readouts; genomic discovery validated by functional biochemistry","pmids":["24531327"],"is_preprint":false},{"year":2011,"finding":"The Drosophila PTP1B orthologue PTP61F dephosphorylates the insulin receptor (IR) in S2 cells and attenuates IR-induced eye overgrowth in vivo; the SH3/SH2 adaptor protein Dock (Drosophila) / Nck (mammalian) forms a stable complex with PTP61F/PTP1B and recruits PTP1B to the IR in response to insulin, which is required for efficient IR dephosphorylation and inactivation.","method":"Co-immunoprecipitation, in vitro IR dephosphorylation assay in S2 cells, in vivo Drosophila eye overgrowth assay, mammalian cell-based inducible IR association assay","journal":"The Biochemical Journal","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro dephosphorylation assay, in vivo genetic rescue, reciprocal Co-IP, and mammalian cell validation; multiple orthogonal methods across two organisms","pmids":["21707536"],"is_preprint":false},{"year":2002,"finding":"Sprouty 2 (hSPRY2) mediates anti-migratory (but not anti-mitogenic) effects by increasing soluble PTP1B amount and activity; overexpression of catalytically active but not inactive (C215S) PTP1B mimics the anti-migratory action of hSPRY2; the C215S catalytically inactive mutant attenuated the anti-migratory effects of hSPRY2.","method":"Subcellular fractionation, PTP activity assay, wild-type vs. C215S mutant overexpression, cell migration assay in HeLa cells","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — catalytic mutant comparison with functional migration readout, single lab with multiple approaches","pmids":["12414790"],"is_preprint":false},{"year":2015,"finding":"Calnexin and PTP1B form UBC9-dependent complexes at the endoplasmic reticulum; SUMOylation of the calnexin cytoplasmic domain by UBC9 modulates calnexin's interaction with PTP1B, revealing a role of the SUMOylation machinery in retaining PTP1B at the ER membrane.","method":"Co-immunoprecipitation, SUMOylation assays, UBC9 interaction studies, ER localization analysis","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP and biochemical SUMOylation assay identifying a novel complex and retention mechanism, single lab","pmids":["25586181"],"is_preprint":false},{"year":2015,"finding":"PTP1B deficiency in dendritic cells leads to increased phospho-STAT3, decreased CCR7 expression, impaired chemotaxis to CCL19, fewer podosomes, increased phosphorylation of Src at Y527, loss of Src localization to podosome puncta, fewer and shorter DC-T cell contacts, and impaired antigen presentation to T cells; establishing PTP1B as a regulator of dendritic cell maturation, migration, and T cell activation.","method":"Myeloid-specific genetic deletion (LysM-Cre), bone marrow-derived DC functional assays, immunofluorescence, in vivo migration assay, T cell co-culture antigen presentation assay","journal":"Journal of Molecular Cell Biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — myeloid-specific KO with multiple functional DC readouts, single lab but multiple orthogonal phenotypic analyses","pmids":["26063615"],"is_preprint":false},{"year":2015,"finding":"O-GlcNAcylation of PTP1B at Ser104, Ser201, and Ser386 modulates its phosphatase activity; site-directed mutation of these O-GlcNAc sites reduces PTP1B phosphatase activity, resulting in higher Akt and GSK3β phosphorylation and improved insulin sensitivity in HepG2 cells.","method":"Site-directed mutagenesis of O-GlcNAc sites, PTP1B phosphatase activity assay, western blotting for downstream signaling in HepG2 cells","journal":"International Journal of Molecular Sciences","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — mutagenesis with direct enzymatic activity measurement and functional signaling readout, single lab","pmids":["26402673"],"is_preprint":false},{"year":2019,"finding":"PTP1B directly increases PKM2 Tyr-105 phosphorylation when inhibited (i.e., PKM2 pY105 is a PTP1B substrate); PTP1B inhibition activates AMPK and decreases mTORC1 activity through PKM2/AMPK signaling, linking PTP1B's dephosphorylation of PKM2 to the control of pancreatic cancer cell growth.","method":"shRNA knockdown, small-molecule PTP1B inhibitor, phospho-western blotting, in vitro and in vivo tumor growth assays","journal":"Cell Death & Disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological inhibition with phospho-substrate readout and in vivo validation; single lab","pmids":["31745071"],"is_preprint":false},{"year":2017,"finding":"PTPN1 is a direct target of miR-124; overexpression of miR-124 or knockdown of PTPN1 impairs glutamate receptor 2 (GluR2) membrane insertion, causing synaptic transmission and plasticity deficits and memory loss in mice; restoration of PTPN1 or suppression of miR-124 rescues these phenotypes.","method":"Adeno-associated virus / lentivirus-mediated overexpression and knockdown, LTP measurements, Golgi staining, Morris water maze, luciferase reporter for miR-124/PTPN1 interaction","journal":"Biological Psychiatry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic rescue experiments with synaptic and behavioral readouts; target validation by reporter assay; single lab","pmids":["28965984"],"is_preprint":false},{"year":2014,"finding":"Curcumin physically interacts with PTPN1/PTP1B to increase its phosphatase activity, leading to dephosphorylation of cortactin at pTyr421; PTPN1 inhibition eliminates curcumin's effects on pTyr421-cortactin and cell migration in colon cancer cells.","method":"Surface biotinylation, mass spectrometry, western blotting, PTP1B activity assay, siRNA knockdown, cell migration assay","journal":"PloS One","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — physical interaction by MS, activity assay, substrate identification (cortactin pY421), and functional migration readout with RNAi rescue; single lab","pmids":["24465712"],"is_preprint":false},{"year":2017,"finding":"HDAC6 directly interacts with PTPN1 (PTP1B), stabilizing its protein level independently of HDAC6's histone-modifying activity; PTPN1 promotes melanoma cell proliferation, colony formation, migration, and ERK1/2 activation; HDAC6 enhances aggressive melanoma progression via the HDAC6/PTPN1/ERK1/2/MMP9 axis.","method":"Co-immunoprecipitation combined with LC-MS/MS, western blotting, cell proliferation/migration assays, shRNA knockdown","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — Co-IP/MS for binding partner identification plus functional cell-based assays; single lab","pmids":["29278704"],"is_preprint":false},{"year":2020,"finding":"CAPN1 (calpain 1) promotes degradation of PTPN1 protein; PTPN1 mediates dephosphorylation of c-Met and PIK3R2 by direct binding, thereby suppressing cell proliferation, metastasis, and erlotinib resistance in lung adenocarcinoma cells; CAPN1-mediated PTPN1 degradation relieves this suppression.","method":"Co-IP, cycloheximide chase (protein synthesis block), phospho-western blotting, CCK-8/colony/transwell assays, shRNA and overexpression","journal":"Thoracic Cancer","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP for binding, CHX chase for degradation, phospho-substrate identification, functional assays; single lab","pmids":["32395869"],"is_preprint":false},{"year":2019,"finding":"Inhibition of PTP1B in the TRALI mouse model attenuates aberrant neutrophil function, releases myeloperoxidase, suppresses NET formation, and inhibits neutrophil migration; mechanistically, reduced CXCR4 signaling—particularly via PI3Kγ/AKT/mTOR—is essential for these effects, linking PTP1B inhibition to promotion of an aged-neutrophil phenotype.","method":"PTP1B inhibitor treatment in TRALI and LPS/CLP sepsis mouse models, PI3Kγ/AKT/mTOR phosphorylation analysis, neutrophil functional assays (NET, migration, myeloperoxidase)","journal":"JCI Insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with pathway-level mechanistic readouts in multiple in vivo models; single lab","pmids":["35866483"],"is_preprint":false},{"year":2023,"finding":"Room-temperature (RT) X-ray crystallography of PTP1B reveals distinct protein-ligand conformational states compared to cryogenic structures: at RT, fewer ligands bind and often more weakly, with different binding poses, altered solvation, new binding sites, and distinct allosteric conformational responses, indicating that cryo-structures provide an incomplete picture of PTP1B-ligand interactions.","method":"Room-temperature X-ray crystallographic screens of PTP1B with diverse small-molecule fragment libraries; comparison to cryogenic structures","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — large-scale crystallographic study (two independent RT screens vs. cryo data) with structural validation of multiple binding modes","pmids":["36881464"],"is_preprint":false}],"current_model":"PTP1B (PTPN1) is an ER-anchored protein tyrosine phosphatase that dephosphorylates receptor tyrosine kinases (insulin receptor, EGFR, PDGFR, EphA3, TRKB), STAT5a/b, JAK-STAT pathway members, β-catenin (Tyr654), cortactin (pY421), MITA/STING (Y245), and PKM2 (Tyr105) at spatially regulated sites—especially at the ER surface after receptor endocytosis—and whose activity is tuned by reversible oxidation of its catalytic cysteine (reactivated by thioredoxin 1 and modulated by bicarbonate/ROS), allosteric WPD-loop dynamics (a conserved CH/π switch coordinating all catalytic loops), O-GlcNAcylation, interaction with 14-3-3ζ (which stabilizes the oxidized inactive form), and recruitment to substrates via adaptor proteins such as Nck/Dock, thereby serving as a central negative regulator of insulin, leptin, and cytokine signaling and a positive regulator of cell adhesion, directed migration, synaptic plasticity, and innate immune attenuation."},"narrative":{"mechanistic_narrative":"PTPN1 (PTP1B) is an endoplasmic-reticulum-anchored protein tyrosine phosphatase that acts as a spatially partitioned terminator of tyrosine-kinase signaling, dephosphorylating receptor tyrosine kinases (EGFR, PDGFR, EphA3, insulin receptor) at defined cytoplasmic sites only after receptor endocytosis brings them into contact with the ER surface, thereby establishing a steady-state enzyme-substrate gradient that permits signaling in the cytoplasm while ensuring eventual signal extinction [PMID:11872838, PMID:17204654, PMID:21135139, PMID:21707536]. Its substrate repertoire extends beyond RTKs to transcriptional effectors and structural regulators: it deactivates prolactin-activated STAT5a/b to block β-casein transcription [PMID:10993888], terminates JAK-STAT signaling in lymphoma where somatic loss-of-function mutations drive oncogenesis [PMID:24531327], and dephosphorylates MITA/STING at Y245 to promote its 20S-proteasomal degradation and attenuate the innate antiviral response [PMID:31527250]. At cell-matrix adhesions, ER-bound PTP1B is delivered along microtubules to nascent focal complexes where it dephosphorylates the Src negative-regulatory site (pY529), paxillin, and p130Cas, thereby tuning RhoA/Rac1 balance and supporting focal-complex lifetime, lamellar protrusion, and directional migration [PMID:16522684, PMID:23444382], and a parallel ER-extension mechanism positions it in axonal growth cones to support Src activity and axon elongation [PMID:19158394]. In neurons it dephosphorylates β-catenin at Tyr654 within N-cadherin complexes to control dendritic spine morphology and learning, with conditional knockout improving memory [PMID:22844492]. PTP1B catalysis is governed by coordinated dynamics of its WPD, Q, E, and substrate-binding loops linked through a conserved CH/π allosteric switch [PMID:28212750, PMID:32737198], and its activity is reversibly tuned by oxidation of the catalytic cysteine—reactivated by thioredoxin-1 through direct thiol-disulfide exchange [PMID:24976139], promoted by bicarbonate-derived peroxymonocarbonate [PMID:31197039], stabilized in the inactive oxidized state by 14-3-3ζ [PMID:31873221], and modulated by O-GlcNAcylation [PMID:26402673]. Loss-of-function mutations in PTPN1 occur in Hodgkin lymphoma and primary mediastinal B-cell lymphoma, where reduced phosphatase activity hyperactivates JAK-STAT signaling [PMID:24531327].","teleology":[{"year":2000,"claim":"Established that PTP1B is not solely an RTK phosphatase but directly inactivates downstream transcription factors, dephosphorylating prolactin-activated STAT5a/b and blocking their nuclear function.","evidence":"Substrate-trapping co-precipitation, in vitro dephosphorylation, and overexpression with β-casein promoter readout in mammary epithelial cells","pmids":["10993888"],"confidence":"High","gaps":["Did not resolve where in the cell STAT5 dephosphorylation occurs","Physiological stoichiometry versus other STAT phosphatases not established"]},{"year":2002,"claim":"Resolved the central spatial paradox of how an ER-tethered phosphatase reaches plasma-membrane RTKs, showing dephosphorylation of EGFR and PDGFR requires receptor endocytosis and occurs at defined ER-surface sites.","evidence":"FRET live-cell imaging of PTP1B–RTK interactions across two RTK types","pmids":["11872838"],"confidence":"High","gaps":["Did not quantify the global activity distribution across the cell","Trafficking machinery delivering receptors to the ER contact site unspecified"]},{"year":2006,"claim":"Defined the delivery mechanism for ER-bound PTP1B to peripheral structures, showing dynamic ER extensions along microtubules target it to immature FAK/paxillin focal complexes.","evidence":"GFP substrate-trapping mutant live imaging, ER-targeting deletion mutants, focal-adhesion marker co-localization, nocodazole","pmids":["16522684"],"confidence":"High","gaps":["Direct adhesion-site substrates not yet identified in this study","Selectivity for immature versus mature adhesions mechanistically unexplained"]},{"year":2007,"claim":"Generalized the spatial model into a quantitative principle: PTP1B sets a robust steady-state enzyme-substrate gradient permitting cytoplasmic signaling while ensuring termination, independent of cell-to-cell variability.","evidence":"FRET imaging of enzyme-substrate intermediates with quantitative gradient measurement","pmids":["17204654"],"confidence":"High","gaps":["Molecular basis maintaining the gradient not fully resolved","Does not address redox or post-translational tuning of the gradient"]},{"year":2009,"claim":"Extended the ER-extension targeting paradigm to neurons, showing microtubule-dependent positioning of PTP1B in growth cones supports Src activity and axon elongation.","evidence":"Live imaging of GFP-PTP1B, nocodazole, ER marker co-localization, functional impairment","pmids":["19158394"],"confidence":"Medium","gaps":["Direct growth-cone substrate not biochemically pinned down","Single-lab functional impairment without genetic confirmation"]},{"year":2010,"claim":"Showed PTP1B regulates Eph receptor signaling amplitude and trafficking, directly dephosphorylating EphA3 at both the plasma membrane and endosomes.","evidence":"FLIM showing direct interaction, substrate-trapping mutant, EphA3 phosphorylation time-course","pmids":["21135139"],"confidence":"High","gaps":["How PTP1B accesses EphA3 at cell-cell contacts pre-internalization unresolved","Endocytic adaptor requirement not defined"]},{"year":2011,"claim":"Identified the adaptor-based recruitment mechanism for substrate selection, showing the Nck/Dock SH3-SH2 adaptor forms a stable complex with PTP1B and recruits it to the insulin receptor.","evidence":"Reciprocal Co-IP, in vitro IR dephosphorylation, in vivo Drosophila eye-overgrowth rescue, mammalian inducible IR association","pmids":["21707536"],"confidence":"High","gaps":["Whether Nck recruitment generalizes to other RTK substrates not tested","Structural basis of the PTP1B–Nck interaction unresolved"]},{"year":2012,"claim":"Connected PTP1B to synaptic structure and cognition, identifying β-catenin pY654 in N-cadherin complexes as a neuronal substrate controlling spine morphology and memory.","evidence":"Global and Emx1-Cre conditional KO mice, western blotting, immunofluorescence, Barnes maze behavior","pmids":["22844492"],"confidence":"High","gaps":["Site of β-catenin dephosphorylation within the neuron not localized","Link between spine remodeling and improved memory only correlative"]},{"year":2013,"claim":"Defined the adhesion-site substrate set and migratory consequence, showing PTP1B targets Src pY529, paxillin, and p130Cas to extend focal-complex lifetime and bias RhoA/Rac1 toward directional migration.","evidence":"FRET, kymography, pull-down, substrate-trapping and active-site mutants, FAK/Src inhibitors","pmids":["23444382"],"confidence":"High","gaps":["Order and interdependence of the three substrate dephosphorylations unresolved","Coupling to RhoA/Rac1 GEFs/GAPs not delineated"]},{"year":2014,"claim":"Established PTP1B as a tumor suppressor in lymphoid malignancy, showing somatic loss-of-function mutations and silencing hyperactivate JAK-STAT signaling.","evidence":"Genome/transcriptome sequencing, phosphatase activity assays on mutants, RNAi in Hodgkin lymphoma cells, phospho-westerns","pmids":["24531327"],"confidence":"High","gaps":["Which JAK-STAT members are direct substrates versus indirect not fully resolved","Tumor-suppressive role context-dependent across cancer types"]},{"year":2014,"claim":"Demonstrated direct thioredoxin-1-mediated reactivation of oxidized PTP1B, defining how cells reset phosphatase activity after oxidative inactivation.","evidence":"Mechanism-based thioredoxin-PTP1B trapping, Co-IP, TRX1 inducible depletion in live cells","pmids":["24976139"],"confidence":"High","gaps":["Kinetics relative to ongoing signaling not quantified","Competition with other reductants in vivo not addressed"]},{"year":2015,"claim":"Linked PTP1B redox/activity control to disease neurobiology, showing MECP2 normally represses PTPN1 and its loss in Rett syndrome elevates PTP1B to impair BDNF/TRKB signaling, reversible by inhibition.","evidence":"MECP2-deficient mice, ChIP of MECP2 at PTPN1, pharmacological inhibition, TRKB phospho-westerns, behavior","pmids":["26214522"],"confidence":"High","gaps":["Whether TRKB is a direct PTP1B substrate not biochemically isolated here","Site of TRKB dephosphorylation not mapped"]},{"year":2015,"claim":"Identified an ER-retention mechanism, showing UBC9-dependent SUMOylation of calnexin modulates calnexin–PTP1B complex formation to hold PTP1B at the ER membrane.","evidence":"Co-IP, SUMOylation assays, UBC9 interaction, ER localization analysis","pmids":["25586181"],"confidence":"Medium","gaps":["Functional consequence for substrate access not directly tested","Single-lab Co-IP without structural mapping of the interface"]},{"year":2015,"claim":"Added O-GlcNAcylation as a metabolic post-translational input, showing modification at Ser104/201/386 tunes phosphatase activity and downstream insulin signaling.","evidence":"Site-directed mutagenesis, phosphatase activity assays, Akt/GSK3β westerns in HepG2","pmids":["26402673"],"confidence":"Medium","gaps":["In vivo occupancy of these sites not established","Mechanism by which O-GlcNAc alters catalytic activity unresolved"]},{"year":2015,"claim":"Extended PTP1B function to innate immunity, showing myeloid-specific loss impairs dendritic-cell maturation, CCR7-driven chemotaxis, and Src/podosome organization.","evidence":"LysM-Cre deletion, BMDC functional assays, immunofluorescence, in vivo migration, T-cell co-culture","pmids":["26063615"],"confidence":"Medium","gaps":["Direct substrate(s) underlying the DC phenotypes not isolated","Single-lab study with phenotypic rather than biochemical resolution"]},{"year":2017,"claim":"Defined the structural-dynamic logic of catalysis, identifying a conserved CH/π allosteric switch governing WPD-loop positioning through conformational and dynamic allostery.","evidence":"NMR, X-ray crystallography, and MD on WT and ≥10 PTP1B variants","pmids":["28212750"],"confidence":"High","gaps":["Connection of the switch to physiological substrate selectivity not tested","Druggability of the allosteric path defined only in vitro"]},{"year":2017,"claim":"Showed protein stabilization as a regulatory layer in cancer, with HDAC6 binding and stabilizing PTP1B to drive an HDAC6/PTPN1/ERK1/2/MMP9 melanoma progression axis.","evidence":"Co-IP/LC-MS-MS, westerns, proliferation/migration assays, shRNA","pmids":["29278704"],"confidence":"Medium","gaps":["Whether ERK1/2 activation is via direct or indirect PTP1B action unresolved","Mechanism of HDAC6-mediated stabilization not defined"]},{"year":2017,"claim":"Placed PTPN1 in a synaptic regulatory circuit, showing it is a direct miR-124 target required for GluR2 membrane insertion, plasticity, and memory.","evidence":"AAV/lentiviral overexpression and knockdown, LTP, Golgi staining, Morris water maze, luciferase 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dephosphorylation routes STING to the 20S proteasome mechanistically unclear","Relative contributions of PTPN1 versus PTPN2 not separated"]},{"year":2019,"claim":"Identified 14-3-3ζ as a binding partner that stabilizes oxidized inactive PTP1B, required for full ROS-mediated inactivation in cells.","evidence":"Co-IP/pulldown, mass spectrometry, phospho-EGFR readout after complex disruption","pmids":["31873221"],"confidence":"Medium","gaps":["Structural basis of 14-3-3ζ recognition of oxidized PTP1B unresolved","Single-lab interaction study"]},{"year":2019,"claim":"Linked acid-base chemistry to redox regulation, showing bicarbonate forms peroxymonocarbonate to facilitate H2O2-mediated PTP1B oxidation, with cellular oxidation bicarbonate-dependent.","evidence":"In vitro assays with recombinant PTP1B, cellular bicarbonate manipulation, EGF-stimulated A431 oxidation measurement","pmids":["31197039"],"confidence":"High","gaps":["Spatial coupling of bicarbonate flux to local PTP1B inactivation not mapped","Generality across other PTPs not addressed"]},{"year":2019,"claim":"Connected PTP1B to metabolic-oncogenic signaling, showing PKM2 Tyr105 is a substrate whose dephosphorylation modulates AMPK/mTORC1 and pancreatic cancer growth.","evidence":"shRNA, small-molecule inhibitor, phospho-westerns, in vitro and in vivo tumor assays","pmids":["31745071"],"confidence":"Medium","gaps":["Direct versus indirect dephosphorylation of PKM2 not fully resolved","Single-lab study"]},{"year":2020,"claim":"Established a coordinated multi-loop dynamic model of catalysis, showing WPD, Q, E, and substrate-binding loops plus the N-terminal helix move as a dynamically unified system across timescales.","evidence":"13C-methyl ILV NMR relaxation and CPMG relaxation dispersion","pmids":["32737198"],"confidence":"High","gaps":["Direct linkage of these dynamics to turnover rate not quantified","Effect of substrate binding on the coordinated motion not fully mapped"]},{"year":2020,"claim":"Identified PTP1B protein turnover by calpain and a tumor-suppressive substrate set, showing CAPN1 degrades PTP1B and PTP1B dephosphorylates c-Met and PIK3R2 to suppress lung adenocarcinoma growth and erlotinib resistance.","evidence":"Co-IP, cycloheximide chase, phospho-westerns, proliferation/colony/transwell assays, shRNA and overexpression","pmids":["32395869"],"confidence":"Medium","gaps":["Whether c-Met and PIK3R2 are direct substrates not biochemically confirmed","Single-lab study"]},{"year":2022,"claim":"Linked PTP1B inhibition to neutrophil immunomodulation, showing inhibition suppresses NET formation and migration via reduced CXCR4–PI3Kγ/AKT/mTOR signaling in TRALI and sepsis models.","evidence":"PTP1B inhibitor in TRALI and LPS/CLP models, pathway phospho-analysis, neutrophil functional assays","pmids":["35866483"],"confidence":"Medium","gaps":["Direct PTP1B substrate in the CXCR4 pathway not identified","Pharmacological inhibition rather than 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macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/33857515","citation_count":22,"is_preprint":false},{"pmid":"32199302","id":"PMC_32199302","title":"Identification of natural products as selective PTP1B inhibitors via virtual screening.","date":"2020","source":"Bioorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32199302","citation_count":22,"is_preprint":false},{"pmid":"37232059","id":"PMC_37232059","title":"A comprehensive review on the research progress of PTP1B inhibitors as antidiabetics.","date":"2023","source":"Chemical biology & drug design","url":"https://pubmed.ncbi.nlm.nih.gov/37232059","citation_count":21,"is_preprint":false},{"pmid":"19158394","id":"PMC_19158394","title":"Microtubule and cell contact dependency of ER-bound PTP1B localization in growth cones.","date":"2009","source":"Molecular biology of the 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[et al.]","url":"https://pubmed.ncbi.nlm.nih.gov/23229720","citation_count":17,"is_preprint":false},{"pmid":"31217339","id":"PMC_31217339","title":"Targeting pancreatic islet PTP1B improves islet graft revascularization and transplant outcomes.","date":"2019","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31217339","citation_count":16,"is_preprint":false},{"pmid":"34015491","id":"PMC_34015491","title":"Ketamine's schizophrenia-like effects are prevented by targeting PTP1B.","date":"2021","source":"Neurobiology of disease","url":"https://pubmed.ncbi.nlm.nih.gov/34015491","citation_count":16,"is_preprint":false},{"pmid":"29928877","id":"PMC_29928877","title":"PTP1B promotes the malignancy of ovarian cancer cells in a JNK-dependent mechanism.","date":"2018","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/29928877","citation_count":16,"is_preprint":false},{"pmid":"32422389","id":"PMC_32422389","title":"The antidiabetic drug lobeglitazone has the potential to inhibit PTP1B activity.","date":"2020","source":"Bioorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/32422389","citation_count":15,"is_preprint":false},{"pmid":"30927676","id":"PMC_30927676","title":"Honey extracts inhibit PTP1B, upregulate insulin receptor expression, and enhance glucose uptake in human HepG2 cells.","date":"2019","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/30927676","citation_count":15,"is_preprint":false},{"pmid":"33857487","id":"PMC_33857487","title":"Licoricidin Abrogates T-Cell Activation by Modulating PTPN1 Activity and Attenuates Atopic Dermatitis In Vivo.","date":"2021","source":"The Journal of investigative dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/33857487","citation_count":14,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46503,"output_tokens":7553,"usd":0.126402,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16975,"output_tokens":7861,"usd":0.1407,"stage2_stop_reason":"end_turn"},"total_usd":0.267102,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"PTP1B-catalyzed dephosphorylation of receptor tyrosine kinases (EGFR and PDGFR) requires endocytosis of the receptors and occurs at specific sites on the cytoplasmic surface of the endoplasmic reticulum, demonstrating that RTK activation and inactivation are spatially and temporally partitioned within cells.\",\n      \"method\": \"Fluorescence resonance energy transfer (FRET) live-cell imaging of PTP1B–RTK interactions\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct FRET imaging of enzyme-substrate interactions in live cells, replicated across two RTK types, mechanistically resolves the spatial regulation of dephosphorylation\",\n      \"pmids\": [\"11872838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"PTP1B specifically dephosphorylates and deactivates prolactin-activated STAT5a and STAT5b, inhibiting their nuclear translocation and downstream transcriptional activation of the beta-casein gene promoter; substrate-trapping mutants of PTP1B co-precipitated tyrosine-phosphorylated STAT5 proteins.\",\n      \"method\": \"Substrate-trapping co-precipitation, overexpression in COS7 cells, in vitro dephosphorylation assay, retrovirus-mediated overexpression in mammary epithelial cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (substrate trapping, in vitro assay, cell-based overexpression with functional readout) in a single study\",\n      \"pmids\": [\"10993888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PTP1B activity is spatially regulated across the cell, establishing a steady-state enzyme-substrate gradient; this gradient is robust to cell-to-cell variability, growth factor activation, and RTK localization, and the ER-localized enzyme allows RTK signaling in the cytoplasm while mediating eventual signal termination.\",\n      \"method\": \"FRET-based live-cell imaging of enzyme-substrate intermediates\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct FRET imaging of ES intermediates in live cells with quantitative gradient measurements; replicated in multiple conditions\",\n      \"pmids\": [\"17204654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PTP1B directly interacts with and dephosphorylates EphA3 receptor, governing its signaling amplitude and duration; PTP1B interacts with EphA3 at the plasma membrane at cell-cell contacts before ligand-stimulated internalization and on endosomes after internalization, and overexpression of wild-type or substrate-trapping PTP1B decelerates EphA3 trafficking and controls its cell-surface concentration.\",\n      \"method\": \"Confocal fluorescence lifetime imaging microscopy (FLIM), overexpression of wild-type and D-A substrate-trapping mutant, EphA3 phosphorylation time-course assay\",\n      \"journal\": \"The Journal of Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — FLIM showing direct interaction, substrate trapping, and functional phenotype (receptor trafficking) with multiple orthogonal approaches in one study\",\n      \"pmids\": [\"21135139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ER-bound PTP1B is targeted to newly forming cell-matrix adhesion sites via dynamic ER extensions along microtubules; deletion of the ER-targeting sequence relocalizes PTP1B to the cytosol and alters its distribution at cell-matrix foci; PTP1B preferentially associates with FAK- and paxillin-containing immature focal complexes rather than zyxin-containing mature foci.\",\n      \"method\": \"GFP-PTP1B substrate-trapping mutant (D181A) live imaging, deletion mutants, co-localization with focal adhesion markers, nocodazole treatment\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — live imaging with functional mutants, domain deletions, and multiple marker co-localizations in one study\",\n      \"pmids\": [\"16522684\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PTP1B enhances focal complex lifetime, facilitates α-actinin incorporation, and contributes to lamellar protrusion persistence and directional migration; PTP1B targets the negative regulatory site of Src (pY529), paxillin, and p130Cas at peripheral cell-matrix adhesions; PTP1B is required for integrin-dependent downregulation of RhoA and upregulation of Rac1 during spreading.\",\n      \"method\": \"Kymograph analysis, pull-down, FRET, substrate-trapping mutant (D181A), FAK/Src inhibitors, active-site mutant\",\n      \"journal\": \"Journal of Cell Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (FRET, kymography, pull-down, pharmacological and genetic inhibition) establishing substrate identity and functional consequence\",\n      \"pmids\": [\"23444382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In hippocampal axonal growth cones, PTP1B localizes to the central domain and peripheral region via ER extensions along microtubules; microtubule disruption by nocodazole redistributes PTP1B to the growth cone base; functional impairment of PTP1B reduces axon elongation, decreases filopodia lifetime, and diminishes Src activity in growth cones.\",\n      \"method\": \"Live imaging of GFP-PTP1B, nocodazole treatment, ER marker co-localization, functional impairment of PTP1B\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with functional consequence (axon elongation and Src activity), single lab, two orthogonal approaches\",\n      \"pmids\": [\"19158394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PTP1B dephosphorylates β-catenin at Tyr-654 in N-cadherin complexes in hippocampal neurons; PTP1B deficiency leads to ~5-fold increased β-catenin pY654 and reduced N-cadherin association with β-catenin, increased filopodia-like dendritic spines, reduced mushroom spines, and disorganized pre- and post-synaptic markers; hippocampus/cortex-specific PTP1B knockout mice show improved learning and memory in the Barnes maze.\",\n      \"method\": \"PTP1B(-/-) mouse model, hippocampus/cortex-specific conditional knockout (Emx1-Cre), western blotting, immunofluorescence, Barnes maze behavioral testing\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with substrate-level biochemical measurement and behavioral functional readout in vivo, multiple orthogonal methods\",\n      \"pmids\": [\"22844492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTPN1 (PTP1B) and PTPN2 associate with MITA/STING following viral infection and dephosphorylate MITA/STING at Y245; this dephosphorylation promotes MITA/STING degradation via the ubiquitin-independent 20S proteasomal pathway in an intrinsically disordered region (IDR)-dependent manner, thereby attenuating innate antiviral response.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis (Y245), proteasome inhibitor assays, PTPN1/2 deficiency with antiviral gene expression readout\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct biochemical identification of dephosphorylation site by mutagenesis, Co-IP, and genetic KO with functional antiviral readout; multiple orthogonal methods\",\n      \"pmids\": [\"31527250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Oxidized (inactive) PTP1B is preferentially reactivated by thioredoxin 1 (TRX1) via direct thiol-disulfide exchange between the active sites; inducible depletion of TRX1 slows PTP1B reactivation in intact living cells; demonstrated by mechanism-based thioredoxin trapping mutants that directly co-immunoprecipitate with PTP1B.\",\n      \"method\": \"Mechanism-based trapping of thioredoxin–PTP1B complexes, anti-tag co-immunoprecipitation, TRX1 inducible depletion in live cells\",\n      \"journal\": \"The FEBS Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — reconstitution-like trapping of direct thiol exchange intermediate, confirmed in live cells with functional consequence, multiple orthogonal approaches\",\n      \"pmids\": [\"24976139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"14-3-3ζ interacts with the reversibly oxidized (inactive) form of PTP1B; destabilizing this interaction prevents PTP1B inactivation by reactive oxygen species and decreases EGFR phosphorylation, establishing that the 14-3-3ζ–oxidized PTP1B complex is required for full ROS-mediated PTP1B inactivation in cells.\",\n      \"method\": \"Molecular interaction studies (co-immunoprecipitation/pulldown), phospho-EGFR readout after complex disruption, mass spectrometry\",\n      \"journal\": \"Nature Chemical Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct identification of binding partner by MS and Co-IP, functional consequence shown, single lab\",\n      \"pmids\": [\"31873221\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Bicarbonate facilitates H2O2-mediated PTP1B inactivation by forming the more reactive peroxymonocarbonate; EGF-induced cellular oxidation of PTP1B and total protein phosphotyrosine levels are completely dependent on intracellular bicarbonate concentration, linking cellular acid-base balance to PTP1B redox regulation.\",\n      \"method\": \"In vitro biochemical assays with purified recombinant PTP1B, cellular bicarbonate manipulation, EGF-stimulated A431 cells, PTP1B oxidation measurement\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro assay plus cellular validation with multiple orthogonal conditions; single lab but comprehensive\",\n      \"pmids\": [\"31197039\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"A recombinant antibody (scFv45) that specifically recognizes oxidized, inactive PTP1B stabilizes it in an inactive conformation, providing proof-of-concept that small molecules mimicking scFv45 can promote insulin and leptin signaling by locking PTP1B in an oxidized state; a small molecule mimicking scFv45 was identified that reproduces this effect.\",\n      \"method\": \"Structural analysis of scFv45–oxidized PTP1B complex, small molecule screening, insulin and leptin signaling assays\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — structural/biochemical basis for inhibition mechanism established, functional validation, single lab\",\n      \"pmids\": [\"29348454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTP1B uses a CH/π switch (evolutionarily conserved) critical for positioning the catalytically important WPD loop, and employs both conformational and dynamic allostery to regulate its activity; these mechanisms were defined by combining NMR, crystallography, and computational data on wild-type and ≥10 PTP1B variants.\",\n      \"method\": \"NMR spectroscopy, X-ray crystallography, molecular dynamics simulations on WT and multiple PTP1B variants\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structural and dynamics data with ≥10 mutant variants; NMR and crystal structures combined with MD; multiple orthogonal methods\",\n      \"pmids\": [\"28212750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"All four catalytically important loops of PTP1B (WPD, Q, E, and substrate-binding loops) work in dynamic unity throughout the catalytic cycle; slow N-terminal helix dynamics, fast side-chain dynamics, and μs–ms conformational exchange of all key loops are dynamically coordinated, not independent.\",\n      \"method\": \"13C-methyl ILV NMR relaxation studies, constant-time CPMG relaxation dispersion measurements\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — comprehensive NMR relaxation study with multiple time-scale measurements; single lab but rigorous multi-method NMR approach\",\n      \"pmids\": [\"32737198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PTP1B is a negative regulator of tyrosine phosphorylation of TRKB (the BDNF receptor); elevated PTP1B in Rett syndrome models (due to MECP2 disruption, which removes MECP2-mediated repression of the PTPN1 gene) impairs BDNF/TRKB signaling; pharmacological PTP1B inhibition increases TRKB tyrosine phosphorylation in brain and improves Rett syndrome phenotypes in mice.\",\n      \"method\": \"MECP2-deficient mouse models, pharmacological PTP1B inhibition, TRKB phosphorylation western blotting, behavioral assays, ChIP/promoter analysis for MECP2 at PTPN1 locus\",\n      \"journal\": \"The Journal of Clinical Investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and pharmacological inhibition with substrate-level phosphorylation readout and in vivo behavioral endpoints; multiple orthogonal approaches\",\n      \"pmids\": [\"26214522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Somatic loss-of-function mutations in PTPN1 in Hodgkin lymphoma and PMBCL lead to reduced PTP1B phosphatase activity and increased phosphorylation of JAK-STAT pathway members; RNAi silencing of PTPN1 in Hodgkin lymphoma cells causes hyperphosphorylation of downstream oncogenic targets, establishing PTP1B as a negative regulator of JAK-STAT signaling in these lymphomas.\",\n      \"method\": \"Whole-genome and whole-transcriptome sequencing, phosphatase activity assays on mutant proteins, RNA interference in Hodgkin lymphoma cell lines, phospho-western blotting\",\n      \"journal\": \"Nature Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — enzymatic activity assays on mutants combined with RNAi and phosphoprotein readouts; genomic discovery validated by functional biochemistry\",\n      \"pmids\": [\"24531327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The Drosophila PTP1B orthologue PTP61F dephosphorylates the insulin receptor (IR) in S2 cells and attenuates IR-induced eye overgrowth in vivo; the SH3/SH2 adaptor protein Dock (Drosophila) / Nck (mammalian) forms a stable complex with PTP61F/PTP1B and recruits PTP1B to the IR in response to insulin, which is required for efficient IR dephosphorylation and inactivation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro IR dephosphorylation assay in S2 cells, in vivo Drosophila eye overgrowth assay, mammalian cell-based inducible IR association assay\",\n      \"journal\": \"The Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro dephosphorylation assay, in vivo genetic rescue, reciprocal Co-IP, and mammalian cell validation; multiple orthogonal methods across two organisms\",\n      \"pmids\": [\"21707536\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Sprouty 2 (hSPRY2) mediates anti-migratory (but not anti-mitogenic) effects by increasing soluble PTP1B amount and activity; overexpression of catalytically active but not inactive (C215S) PTP1B mimics the anti-migratory action of hSPRY2; the C215S catalytically inactive mutant attenuated the anti-migratory effects of hSPRY2.\",\n      \"method\": \"Subcellular fractionation, PTP activity assay, wild-type vs. C215S mutant overexpression, cell migration assay in HeLa cells\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — catalytic mutant comparison with functional migration readout, single lab with multiple approaches\",\n      \"pmids\": [\"12414790\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Calnexin and PTP1B form UBC9-dependent complexes at the endoplasmic reticulum; SUMOylation of the calnexin cytoplasmic domain by UBC9 modulates calnexin's interaction with PTP1B, revealing a role of the SUMOylation machinery in retaining PTP1B at the ER membrane.\",\n      \"method\": \"Co-immunoprecipitation, SUMOylation assays, UBC9 interaction studies, ER localization analysis\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP and biochemical SUMOylation assay identifying a novel complex and retention mechanism, single lab\",\n      \"pmids\": [\"25586181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PTP1B deficiency in dendritic cells leads to increased phospho-STAT3, decreased CCR7 expression, impaired chemotaxis to CCL19, fewer podosomes, increased phosphorylation of Src at Y527, loss of Src localization to podosome puncta, fewer and shorter DC-T cell contacts, and impaired antigen presentation to T cells; establishing PTP1B as a regulator of dendritic cell maturation, migration, and T cell activation.\",\n      \"method\": \"Myeloid-specific genetic deletion (LysM-Cre), bone marrow-derived DC functional assays, immunofluorescence, in vivo migration assay, T cell co-culture antigen presentation assay\",\n      \"journal\": \"Journal of Molecular Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — myeloid-specific KO with multiple functional DC readouts, single lab but multiple orthogonal phenotypic analyses\",\n      \"pmids\": [\"26063615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"O-GlcNAcylation of PTP1B at Ser104, Ser201, and Ser386 modulates its phosphatase activity; site-directed mutation of these O-GlcNAc sites reduces PTP1B phosphatase activity, resulting in higher Akt and GSK3β phosphorylation and improved insulin sensitivity in HepG2 cells.\",\n      \"method\": \"Site-directed mutagenesis of O-GlcNAc sites, PTP1B phosphatase activity assay, western blotting for downstream signaling in HepG2 cells\",\n      \"journal\": \"International Journal of Molecular Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — mutagenesis with direct enzymatic activity measurement and functional signaling readout, single lab\",\n      \"pmids\": [\"26402673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PTP1B directly increases PKM2 Tyr-105 phosphorylation when inhibited (i.e., PKM2 pY105 is a PTP1B substrate); PTP1B inhibition activates AMPK and decreases mTORC1 activity through PKM2/AMPK signaling, linking PTP1B's dephosphorylation of PKM2 to the control of pancreatic cancer cell growth.\",\n      \"method\": \"shRNA knockdown, small-molecule PTP1B inhibitor, phospho-western blotting, in vitro and in vivo tumor growth assays\",\n      \"journal\": \"Cell Death & Disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological inhibition with phospho-substrate readout and in vivo validation; single lab\",\n      \"pmids\": [\"31745071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"PTPN1 is a direct target of miR-124; overexpression of miR-124 or knockdown of PTPN1 impairs glutamate receptor 2 (GluR2) membrane insertion, causing synaptic transmission and plasticity deficits and memory loss in mice; restoration of PTPN1 or suppression of miR-124 rescues these phenotypes.\",\n      \"method\": \"Adeno-associated virus / lentivirus-mediated overexpression and knockdown, LTP measurements, Golgi staining, Morris water maze, luciferase reporter for miR-124/PTPN1 interaction\",\n      \"journal\": \"Biological Psychiatry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic rescue experiments with synaptic and behavioral readouts; target validation by reporter assay; single lab\",\n      \"pmids\": [\"28965984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Curcumin physically interacts with PTPN1/PTP1B to increase its phosphatase activity, leading to dephosphorylation of cortactin at pTyr421; PTPN1 inhibition eliminates curcumin's effects on pTyr421-cortactin and cell migration in colon cancer cells.\",\n      \"method\": \"Surface biotinylation, mass spectrometry, western blotting, PTP1B activity assay, siRNA knockdown, cell migration assay\",\n      \"journal\": \"PloS One\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — physical interaction by MS, activity assay, substrate identification (cortactin pY421), and functional migration readout with RNAi rescue; single lab\",\n      \"pmids\": [\"24465712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HDAC6 directly interacts with PTPN1 (PTP1B), stabilizing its protein level independently of HDAC6's histone-modifying activity; PTPN1 promotes melanoma cell proliferation, colony formation, migration, and ERK1/2 activation; HDAC6 enhances aggressive melanoma progression via the HDAC6/PTPN1/ERK1/2/MMP9 axis.\",\n      \"method\": \"Co-immunoprecipitation combined with LC-MS/MS, western blotting, cell proliferation/migration assays, shRNA knockdown\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — Co-IP/MS for binding partner identification plus functional cell-based assays; single lab\",\n      \"pmids\": [\"29278704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CAPN1 (calpain 1) promotes degradation of PTPN1 protein; PTPN1 mediates dephosphorylation of c-Met and PIK3R2 by direct binding, thereby suppressing cell proliferation, metastasis, and erlotinib resistance in lung adenocarcinoma cells; CAPN1-mediated PTPN1 degradation relieves this suppression.\",\n      \"method\": \"Co-IP, cycloheximide chase (protein synthesis block), phospho-western blotting, CCK-8/colony/transwell assays, shRNA and overexpression\",\n      \"journal\": \"Thoracic Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP for binding, CHX chase for degradation, phospho-substrate identification, functional assays; single lab\",\n      \"pmids\": [\"32395869\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Inhibition of PTP1B in the TRALI mouse model attenuates aberrant neutrophil function, releases myeloperoxidase, suppresses NET formation, and inhibits neutrophil migration; mechanistically, reduced CXCR4 signaling—particularly via PI3Kγ/AKT/mTOR—is essential for these effects, linking PTP1B inhibition to promotion of an aged-neutrophil phenotype.\",\n      \"method\": \"PTP1B inhibitor treatment in TRALI and LPS/CLP sepsis mouse models, PI3Kγ/AKT/mTOR phosphorylation analysis, neutrophil functional assays (NET, migration, myeloperoxidase)\",\n      \"journal\": \"JCI Insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with pathway-level mechanistic readouts in multiple in vivo models; single lab\",\n      \"pmids\": [\"35866483\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Room-temperature (RT) X-ray crystallography of PTP1B reveals distinct protein-ligand conformational states compared to cryogenic structures: at RT, fewer ligands bind and often more weakly, with different binding poses, altered solvation, new binding sites, and distinct allosteric conformational responses, indicating that cryo-structures provide an incomplete picture of PTP1B-ligand interactions.\",\n      \"method\": \"Room-temperature X-ray crystallographic screens of PTP1B with diverse small-molecule fragment libraries; comparison to cryogenic structures\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — large-scale crystallographic study (two independent RT screens vs. cryo data) with structural validation of multiple binding modes\",\n      \"pmids\": [\"36881464\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PTP1B (PTPN1) is an ER-anchored protein tyrosine phosphatase that dephosphorylates receptor tyrosine kinases (insulin receptor, EGFR, PDGFR, EphA3, TRKB), STAT5a/b, JAK-STAT pathway members, β-catenin (Tyr654), cortactin (pY421), MITA/STING (Y245), and PKM2 (Tyr105) at spatially regulated sites—especially at the ER surface after receptor endocytosis—and whose activity is tuned by reversible oxidation of its catalytic cysteine (reactivated by thioredoxin 1 and modulated by bicarbonate/ROS), allosteric WPD-loop dynamics (a conserved CH/π switch coordinating all catalytic loops), O-GlcNAcylation, interaction with 14-3-3ζ (which stabilizes the oxidized inactive form), and recruitment to substrates via adaptor proteins such as Nck/Dock, thereby serving as a central negative regulator of insulin, leptin, and cytokine signaling and a positive regulator of cell adhesion, directed migration, synaptic plasticity, and innate immune attenuation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PTPN1 (PTP1B) is an endoplasmic-reticulum-anchored protein tyrosine phosphatase that acts as a spatially partitioned terminator of tyrosine-kinase signaling, dephosphorylating receptor tyrosine kinases (EGFR, PDGFR, EphA3, insulin receptor) at defined cytoplasmic sites only after receptor endocytosis brings them into contact with the ER surface, thereby establishing a steady-state enzyme-substrate gradient that permits signaling in the cytoplasm while ensuring eventual signal extinction [#0, #2, #3, #17]. Its substrate repertoire extends beyond RTKs to transcriptional effectors and structural regulators: it deactivates prolactin-activated STAT5a/b to block β-casein transcription [#1], terminates JAK-STAT signaling in lymphoma where somatic loss-of-function mutations drive oncogenesis [#16], and dephosphorylates MITA/STING at Y245 to promote its 20S-proteasomal degradation and attenuate the innate antiviral response [#8]. At cell-matrix adhesions, ER-bound PTP1B is delivered along microtubules to nascent focal complexes where it dephosphorylates the Src negative-regulatory site (pY529), paxillin, and p130Cas, thereby tuning RhoA/Rac1 balance and supporting focal-complex lifetime, lamellar protrusion, and directional migration [#4, #5], and a parallel ER-extension mechanism positions it in axonal growth cones to support Src activity and axon elongation [#6]. In neurons it dephosphorylates β-catenin at Tyr654 within N-cadherin complexes to control dendritic spine morphology and learning, with conditional knockout improving memory [#7]. PTP1B catalysis is governed by coordinated dynamics of its WPD, Q, E, and substrate-binding loops linked through a conserved CH/π allosteric switch [#13, #14], and its activity is reversibly tuned by oxidation of the catalytic cysteine—reactivated by thioredoxin-1 through direct thiol-disulfide exchange [#9], promoted by bicarbonate-derived peroxymonocarbonate [#11], stabilized in the inactive oxidized state by 14-3-3ζ [#10], and modulated by O-GlcNAcylation [#21]. Loss-of-function mutations in PTPN1 occur in Hodgkin lymphoma and primary mediastinal B-cell lymphoma, where reduced phosphatase activity hyperactivates JAK-STAT signaling [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established that PTP1B is not solely an RTK phosphatase but directly inactivates downstream transcription factors, dephosphorylating prolactin-activated STAT5a/b and blocking their nuclear function.\",\n      \"evidence\": \"Substrate-trapping co-precipitation, in vitro dephosphorylation, and overexpression with β-casein promoter readout in mammary epithelial cells\",\n      \"pmids\": [\"10993888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve where in the cell STAT5 dephosphorylation occurs\", \"Physiological stoichiometry versus other STAT phosphatases not established\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Resolved the central spatial paradox of how an ER-tethered phosphatase reaches plasma-membrane RTKs, showing dephosphorylation of EGFR and PDGFR requires receptor endocytosis and occurs at defined ER-surface sites.\",\n      \"evidence\": \"FRET live-cell imaging of PTP1B–RTK interactions across two RTK types\",\n      \"pmids\": [\"11872838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not quantify the global activity distribution across the cell\", \"Trafficking machinery delivering receptors to the ER contact site unspecified\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the delivery mechanism for ER-bound PTP1B to peripheral structures, showing dynamic ER extensions along microtubules target it to immature FAK/paxillin focal complexes.\",\n      \"evidence\": \"GFP substrate-trapping mutant live imaging, ER-targeting deletion mutants, focal-adhesion marker co-localization, nocodazole\",\n      \"pmids\": [\"16522684\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct adhesion-site substrates not yet identified in this study\", \"Selectivity for immature versus mature adhesions mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Generalized the spatial model into a quantitative principle: PTP1B sets a robust steady-state enzyme-substrate gradient permitting cytoplasmic signaling while ensuring termination, independent of cell-to-cell variability.\",\n      \"evidence\": \"FRET imaging of enzyme-substrate intermediates with quantitative gradient measurement\",\n      \"pmids\": [\"17204654\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis maintaining the gradient not fully resolved\", \"Does not address redox or post-translational tuning of the gradient\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Extended the ER-extension targeting paradigm to neurons, showing microtubule-dependent positioning of PTP1B in growth cones supports Src activity and axon elongation.\",\n      \"evidence\": \"Live imaging of GFP-PTP1B, nocodazole, ER marker co-localization, functional impairment\",\n      \"pmids\": [\"19158394\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct growth-cone substrate not biochemically pinned down\", \"Single-lab functional impairment without genetic confirmation\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed PTP1B regulates Eph receptor signaling amplitude and trafficking, directly dephosphorylating EphA3 at both the plasma membrane and endosomes.\",\n      \"evidence\": \"FLIM showing direct interaction, substrate-trapping mutant, EphA3 phosphorylation time-course\",\n      \"pmids\": [\"21135139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PTP1B accesses EphA3 at cell-cell contacts pre-internalization unresolved\", \"Endocytic adaptor requirement not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified the adaptor-based recruitment mechanism for substrate selection, showing the Nck/Dock SH3-SH2 adaptor forms a stable complex with PTP1B and recruits it to the insulin receptor.\",\n      \"evidence\": \"Reciprocal Co-IP, in vitro IR dephosphorylation, in vivo Drosophila eye-overgrowth rescue, mammalian inducible IR association\",\n      \"pmids\": [\"21707536\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Nck recruitment generalizes to other RTK substrates not tested\", \"Structural basis of the PTP1B–Nck interaction unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected PTP1B to synaptic structure and cognition, identifying β-catenin pY654 in N-cadherin complexes as a neuronal substrate controlling spine morphology and memory.\",\n      \"evidence\": \"Global and Emx1-Cre conditional KO mice, western blotting, immunofluorescence, Barnes maze behavior\",\n      \"pmids\": [\"22844492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Site of β-catenin dephosphorylation within the neuron not localized\", \"Link between spine remodeling and improved memory only correlative\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the adhesion-site substrate set and migratory consequence, showing PTP1B targets Src pY529, paxillin, and p130Cas to extend focal-complex lifetime and bias RhoA/Rac1 toward directional migration.\",\n      \"evidence\": \"FRET, kymography, pull-down, substrate-trapping and active-site mutants, FAK/Src inhibitors\",\n      \"pmids\": [\"23444382\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Order and interdependence of the three substrate dephosphorylations unresolved\", \"Coupling to RhoA/Rac1 GEFs/GAPs not delineated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established PTP1B as a tumor suppressor in lymphoid malignancy, showing somatic loss-of-function mutations and silencing hyperactivate JAK-STAT signaling.\",\n      \"evidence\": \"Genome/transcriptome sequencing, phosphatase activity assays on mutants, RNAi in Hodgkin lymphoma cells, phospho-westerns\",\n      \"pmids\": [\"24531327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which JAK-STAT members are direct substrates versus indirect not fully resolved\", \"Tumor-suppressive role context-dependent across cancer types\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated direct thioredoxin-1-mediated reactivation of oxidized PTP1B, defining how cells reset phosphatase activity after oxidative inactivation.\",\n      \"evidence\": \"Mechanism-based thioredoxin-PTP1B trapping, Co-IP, TRX1 inducible depletion in live cells\",\n      \"pmids\": [\"24976139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Kinetics relative to ongoing signaling not quantified\", \"Competition with other reductants in vivo not addressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked PTP1B redox/activity control to disease neurobiology, showing MECP2 normally represses PTPN1 and its loss in Rett syndrome elevates PTP1B to impair BDNF/TRKB signaling, reversible by inhibition.\",\n      \"evidence\": \"MECP2-deficient mice, ChIP of MECP2 at PTPN1, pharmacological inhibition, TRKB phospho-westerns, behavior\",\n      \"pmids\": [\"26214522\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TRKB is a direct PTP1B substrate not biochemically isolated here\", \"Site of TRKB dephosphorylation not mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified an ER-retention mechanism, showing UBC9-dependent SUMOylation of calnexin modulates calnexin–PTP1B complex formation to hold PTP1B at the ER membrane.\",\n      \"evidence\": \"Co-IP, SUMOylation assays, UBC9 interaction, ER localization analysis\",\n      \"pmids\": [\"25586181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence for substrate access not directly tested\", \"Single-lab Co-IP without structural mapping of the interface\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Added O-GlcNAcylation as a metabolic post-translational input, showing modification at Ser104/201/386 tunes phosphatase activity and downstream insulin signaling.\",\n      \"evidence\": \"Site-directed mutagenesis, phosphatase activity assays, Akt/GSK3β westerns in HepG2\",\n      \"pmids\": [\"26402673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo occupancy of these sites not established\", \"Mechanism by which O-GlcNAc alters catalytic activity unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended PTP1B function to innate immunity, showing myeloid-specific loss impairs dendritic-cell maturation, CCR7-driven chemotaxis, and Src/podosome organization.\",\n      \"evidence\": \"LysM-Cre deletion, BMDC functional assays, immunofluorescence, in vivo migration, T-cell co-culture\",\n      \"pmids\": [\"26063615\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate(s) underlying the DC phenotypes not isolated\", \"Single-lab study with phenotypic rather than biochemical resolution\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the structural-dynamic logic of catalysis, identifying a conserved CH/π allosteric switch governing WPD-loop positioning through conformational and dynamic allostery.\",\n      \"evidence\": \"NMR, X-ray crystallography, and MD on WT and ≥10 PTP1B variants\",\n      \"pmids\": [\"28212750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Connection of the switch to physiological substrate selectivity not tested\", \"Druggability of the allosteric path defined only in vitro\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed protein stabilization as a regulatory layer in cancer, with HDAC6 binding and stabilizing PTP1B to drive an HDAC6/PTPN1/ERK1/2/MMP9 melanoma progression axis.\",\n      \"evidence\": \"Co-IP/LC-MS-MS, westerns, proliferation/migration assays, shRNA\",\n      \"pmids\": [\"29278704\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ERK1/2 activation is via direct or indirect PTP1B action unresolved\", \"Mechanism of HDAC6-mediated stabilization not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed PTPN1 in a synaptic regulatory circuit, showing it is a direct miR-124 target required for GluR2 membrane insertion, plasticity, and memory.\",\n      \"evidence\": \"AAV/lentiviral overexpression and knockdown, LTP, Golgi staining, Morris water maze, luciferase reporter\",\n      \"pmids\": [\"28965984\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate linking PTP1B to GluR2 trafficking not identified\", \"Single-lab in vivo manipulations\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided proof-of-concept for trapping oxidized PTP1B therapeutically, showing scFv45 and a mimicking small molecule lock the oxidized inactive conformation to enhance insulin and leptin signaling.\",\n      \"evidence\": \"Structural analysis of scFv45–oxidized PTP1B, small-molecule screening, signaling assays\",\n      \"pmids\": [\"29348454\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo efficacy and selectivity of the small molecule not established\", \"Single-lab structural and functional validation\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an antiviral-attenuation substrate, showing PTP1B (with PTPN2) dephosphorylates MITA/STING at Y245 to drive its ubiquitin-independent 20S degradation.\",\n      \"evidence\": \"Co-IP, Y245 mutagenesis, proteasome inhibitors, PTPN1/2 KO with antiviral gene readout\",\n      \"pmids\": [\"31527250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How dephosphorylation routes STING to the 20S proteasome mechanistically unclear\", \"Relative contributions of PTPN1 versus PTPN2 not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified 14-3-3ζ as a binding partner that stabilizes oxidized inactive PTP1B, required for full ROS-mediated inactivation in cells.\",\n      \"evidence\": \"Co-IP/pulldown, mass spectrometry, phospho-EGFR readout after complex disruption\",\n      \"pmids\": [\"31873221\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of 14-3-3ζ recognition of oxidized PTP1B unresolved\", \"Single-lab interaction study\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked acid-base chemistry to redox regulation, showing bicarbonate forms peroxymonocarbonate to facilitate H2O2-mediated PTP1B oxidation, with cellular oxidation bicarbonate-dependent.\",\n      \"evidence\": \"In vitro assays with recombinant PTP1B, cellular bicarbonate manipulation, EGF-stimulated A431 oxidation measurement\",\n      \"pmids\": [\"31197039\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial coupling of bicarbonate flux to local PTP1B inactivation not mapped\", \"Generality across other PTPs not addressed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected PTP1B to metabolic-oncogenic signaling, showing PKM2 Tyr105 is a substrate whose dephosphorylation modulates AMPK/mTORC1 and pancreatic cancer growth.\",\n      \"evidence\": \"shRNA, small-molecule inhibitor, phospho-westerns, in vitro and in vivo tumor assays\",\n      \"pmids\": [\"31745071\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect dephosphorylation of PKM2 not fully resolved\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established a coordinated multi-loop dynamic model of catalysis, showing WPD, Q, E, and substrate-binding loops plus the N-terminal helix move as a dynamically unified system across timescales.\",\n      \"evidence\": \"13C-methyl ILV NMR relaxation and CPMG relaxation dispersion\",\n      \"pmids\": [\"32737198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct linkage of these dynamics to turnover rate not quantified\", \"Effect of substrate binding on the coordinated motion not fully mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified PTP1B protein turnover by calpain and a tumor-suppressive substrate set, showing CAPN1 degrades PTP1B and PTP1B dephosphorylates c-Met and PIK3R2 to suppress lung adenocarcinoma growth and erlotinib resistance.\",\n      \"evidence\": \"Co-IP, cycloheximide chase, phospho-westerns, proliferation/colony/transwell assays, shRNA and overexpression\",\n      \"pmids\": [\"32395869\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether c-Met and PIK3R2 are direct substrates not biochemically confirmed\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Linked PTP1B inhibition to neutrophil immunomodulation, showing inhibition suppresses NET formation and migration via reduced CXCR4–PI3Kγ/AKT/mTOR signaling in TRALI and sepsis models.\",\n      \"evidence\": \"PTP1B inhibitor in TRALI and LPS/CLP models, pathway phospho-analysis, neutrophil functional assays\",\n      \"pmids\": [\"35866483\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PTP1B substrate in the CXCR4 pathway not identified\", \"Pharmacological inhibition rather than genetic deletion\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed temperature-dependent conformational landscapes relevant to drug discovery, showing room-temperature crystallography exposes binding modes and allosteric sites missed by cryogenic structures.\",\n      \"evidence\": \"Room-temperature X-ray fragment screens versus cryogenic comparison\",\n      \"pmids\": [\"36881464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional/cellular consequence of the newly revealed sites untested\", \"Translation to in vivo inhibitor efficacy not addressed\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the diverse regulatory inputs—redox oxidation/reactivation, 14-3-3ζ binding, O-GlcNAcylation, ER retention, adaptor recruitment, and proteolytic turnover—are integrated in real time to set substrate-specific PTP1B activity across the gradient remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coupling redox state to substrate-specific spatial activity\", \"Quantitative hierarchy among the post-translational regulators unknown\", \"Whether distinct substrate pools require distinct recruitment/retention mechanisms untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 3, 5, 7, 8, 16, 17, 22]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [0, 1, 13, 16, 21]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 17, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 2, 4, 6, 19]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [3, 4, 5]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 3, 17]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 16]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [8, 20, 27]},\n      {\"term_id\": \"R-HSA-1474244\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [9, 10, 11]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 16, 22, 26]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NCK1\", \"TXN\", \"YWHAZ\", \"CANX\", \"UBE2I\", \"HDAC6\", \"CAPN1\", \"STING1\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}