{"gene":"ACP1","run_date":"2026-06-09T22:02:39","timeline":{"discoveries":[{"year":1991,"finding":"The two isozymes (Bf and Bs) encoded by the ACP1*B allele are not glycosylated, consist of a single peptide chain of 157 amino acid residues acetylated at the amino-terminal alanine, and differ only in the sequence segment 40-73, consistent with generation by alternative splicing of the primary RNA transcript.","method":"Protein sequencing of purified isozymes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct amino acid sequencing of purified proteins, replicated across multiple alleles (A, B, C) in two independent papers (PMID:1939112, PMID:1627603)","pmids":["1939112","1627603"],"is_preprint":false},{"year":1993,"finding":"The ACP1 gene contains six linearly positioned exons (covering codons 14-157) including two exons of equal length (114 bp) encoding the f and s specific segments respectively, interspaced by a short probably non-functional intron, strongly supporting mutually exclusive alternative RNA splicing as the mechanism generating f and s isoforms.","method":"Genomic sequencing and exon structure analysis by PCR","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genomic sequencing establishing gene structure, replicated and extended by PMID:8586411 full gene characterization","pmids":["8216326","8586411"],"is_preprint":false},{"year":1992,"finding":"In vitro kinetic analysis showed that the ACP1 gene product (18 kDa acid phosphatase) utilizes flavin mononucleotide (FMN) as an efficient substrate (kcat/Km = 7.3×10³ s⁻¹M⁻¹), while the tyrosyl-phosphorylated form of adipocyte lipid binding protein is a relatively poor substrate (kcat/Km = 0.17 s⁻¹M⁻¹); all soluble FMN phosphatase activity in CHO cells was inhibited by anti-ACP1 antibodies, suggesting the enzyme functions as an FMN phosphatase in vivo.","method":"In vitro kinetic assay, cell fractionation, immunoinhibition with specific antibodies in CHO cells","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstituted in vitro kinetics plus immunoinhibition of cellular activity, single lab with two orthogonal methods","pmids":["1336375"],"is_preprint":false},{"year":1993,"finding":"The fast (f) and slow (s) ACP1 isoforms show markedly differential activity modulation by purines: kcat of f isoforms is increased 5.1-fold by hypoxanthine and decreased 40% by adenine, while kcat of s isoforms is unaffected by hypoxanthine but increased 4.6-fold by adenine; kinetics indicate effectors bind to free enzyme and enzyme-substrate complex at a site distinct from the substrate-binding site (parasteric binding).","method":"Kinetic analysis of purified homogeneous isozymes","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous kinetic characterization of purified isozymes with mechanistic interpretation, single lab","pmids":["8457591"],"is_preprint":false},{"year":1997,"finding":"LMW-PTP (ACP1) acts as a negative regulator of insulin-mediated signaling: dominant-negative LMW-PTP (C12S mutant) associates with the beta-subunit of the insulin receptor in a phosphorylation-dependent manner via the catalytic site; overexpression of dnLMW-PTP increases glycogenosynthesis and mitosis; LMW-PTP specifically regulates insulin mitogenesis through a c-Src kinase-dependent pathway, independent of PI3K and ERK.","method":"Dominant-negative overexpression in NIH3T3 cells, in vitro binding assay, orthovanadate competition, glycogen synthesis assay, thymidine incorporation, signal pathway analysis","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP/pulldown with dominant-negative mutant, in vitro binding competition, multiple functional readouts in single lab","pmids":["9299573"],"is_preprint":false},{"year":2002,"finding":"LMW-PTP preferentially acts on cell-surface PDGF receptor (excluding internalized receptor pool) and exerts site-selective dephosphorylation specifically at Tyr-857 in the kinase activation loop of PDGF-r, thereby reducing kinase activity and downstream binding of PI3K, SHP-2, and PLCγ1, while having only slight effect on Tyr-716 (which directs MAPK/Grb2 signaling).","method":"Cell-based phosphorylation assays, site-specific mutagenesis/phosphosite analysis, co-immunoprecipitation, kinase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — site-specific dephosphorylation demonstrated with multiple downstream readouts, single lab with orthogonal methods","pmids":["12149261"],"is_preprint":false},{"year":2001,"finding":"LMW-PTP contains two catalytic pocket cysteines (Cys12 and Cys17); the enzyme is oxidized and inactivated by both exogenous and endogenously generated (PDGF signaling) ROS in vivo; recovery of activity is glutathione-dependent; Cys17 forms an intramolecular S-S bond with Cys12 that protects the catalytic cysteine from irreversible oxidation; LMW-PTP is reduced/activated during contact inhibition and myoblast differentiation, supporting a role as a growth inhibition modulator.","method":"In vitro oxidation assays, in vivo ROS measurements, glutathione-dependent activity recovery, cell-based functional assays (contact inhibition, differentiation)","journal":"IUBMB life","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple functional readouts described in review-style paper; original experiments cited but abstract is a synthesis; single lab","pmids":["11795594"],"is_preprint":false},{"year":2000,"finding":"LMW-PTP exists in two intracellular pools: cytosolic (which interacts directly with activated insulin or PDGF receptors) and cytoskeleton-associated (which becomes tyrosine phosphorylated upon PDGF stimulation and acts on p190Rho-GAP to regulate cytoskeleton rearrangement); PDGF but not insulin stimulation leads to tyrosine phosphorylation of LMW-PTP, explaining differential signaling effects.","method":"Cell fractionation, dominant-negative LMW-PTP overexpression, tyrosine phosphorylation assays, adhesion and chemotaxis assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — subcellular fractionation with functional consequences, single lab","pmids":["10753664"],"is_preprint":false},{"year":2003,"finding":"LMW-PTP associates with and dephosphorylates STAT5 in DAMI megakaryoblastic cells; the interaction does not exclusively involve the phosphatase active site; an essential region of interaction was identified at the STAT5 C-terminus, coinciding with a previously hypothesized PTP-associating domain of nine amino acids.","method":"Co-immunoprecipitation, phosphatase activity assay, domain-mapping experiments in DAMI cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — reciprocal Co-IP with domain mapping, single lab, single study","pmids":["14637146"],"is_preprint":false},{"year":2008,"finding":"During PMA-induced megakaryocyte differentiation, LMW-PTP interaction with STAT5 depends on STAT5 threonine phosphorylation at residue Thr757; protein kinase C inhibition prevents PMA-induced STAT5 Thr phosphorylation and LMW-PTP association; a Thr757Val STAT5 mutant disrupts the LMW-PTP/STAT5 interaction, though phosphorylation of this residue itself is not required.","method":"Mutagenesis of STAT5 (Thr757Val), pharmacological PKC inhibition, co-immunoprecipitation","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis plus pharmacological inhibition identifying essential residue, single lab two orthogonal approaches","pmids":["18197699"],"is_preprint":false},{"year":2004,"finding":"LMW-PTP overexpression in NIH3T3 fibroblasts engrafted in nude mice induces larger fibrosarcomas with higher proliferation compared to controls; in sarcoma extracts, LMW-PTP overexpression specifically dephosphorylates EphA2 (but not PDGF receptor or beta-catenin tyrosine phosphorylation), suggesting LMW-PTP oncogenic potential is mediated by EphA2 dephosphorylation.","method":"In vivo tumor engraftment in nude mice, Western blot for receptor phosphorylation, dominant-negative LMW-PTP comparison","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo model with molecular substrate identification, single lab","pmids":["15021900"],"is_preprint":false},{"year":2006,"finding":"Oxidative stress triggers LMW-PTP inactivation and consequent hyper-phosphorylation of Tyr132, which acts as a docking site for the adaptor protein Grb2; enhanced Grb2 recruitment to LMW-PTP leads to ERK activation, providing a redox-dependent prosurvival signaling switch.","method":"Phosphorylation site-specific analysis, co-immunoprecipitation of Grb2 with LMW-PTP, ERK activation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — site-specific phosphorylation with co-IP and downstream readout, single lab","pmids":["16890200"],"is_preprint":false},{"year":2007,"finding":"Recombinant LMW-PTP purified from human lens epithelial cells displays tyrosine-specific phosphatase activity; it is inactivated by H2O2 via formation of an intramolecular disulfide bond between C13 and C18 (at the active site, confirmed by mass spectrometry); activity is restored by the thioltransferase (TTase)/GSH system; in TTase-knockout mouse lens epithelial cells, LMW-PTP activity is progressively lost after PDGF stimulation, resulting in sustained phosphorylation of PDGF receptor Tyr857 and downstream Akt and ERK1/2.","method":"In vitro activity assay, mass spectrometry (disulfide bond identification), TTase/GSH reconstitution, TTase knockout mouse LECs","journal":"Biochimica et biophysica acta","confidence":"High","confidence_rationale":"Tier 1 / Moderate — MS structural confirmation of disulfide bond, in vitro reconstitution, genetic KO validation, single lab multiple orthogonal methods","pmids":["17428749"],"is_preprint":false},{"year":2012,"finding":"VEGF causes reversible S-glutathionylation of LMW-PTP in human microvascular endothelial cells, which inhibits LMW-PTP phosphorylation and activity; this allows transient FAK activation and association with LMW-PTP, promoting endothelial cell migration; oxidative or reductive shifts prevent VEGF-mediated S-glutathionylation and FAK activation, blocking migration; LMW-PTP knockdown markedly enhances FAK activation and migration.","method":"S-glutathionylation assay, LMW-PTP activity assay, co-immunoprecipitation (FAK/LMW-PTP), siRNA knockdown, cell migration assay, pharmacological redox manipulation","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal approaches (biochemical PTM assay, Co-IP, KD, functional migration), single lab","pmids":["22854047"],"is_preprint":false},{"year":2012,"finding":"LMW-PTP knockdown in chemoresistant CML cells (Lucena-1) reverts resistance to vincristine and imatinib mesylate, accompanied by decreased Src and Bcr-Abl phosphorylation at activating sites; conversely, LMW-PTP overexpression in K562 cells induces vincristine resistance, demonstrating LMW-PTP maintains Src and Bcr-Abl in active states.","method":"siRNA knockdown, LMW-PTP overexpression, kinase phosphorylation assays, cell viability assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined molecular readouts, single lab","pmids":["22957062"],"is_preprint":false},{"year":2014,"finding":"LMW-PTP controls FAK phosphorylation at Tyr397 during osteoblast adhesion: silencing LMW-PTP increases FAK Y397 phosphorylation, while overexpression decreases it; ROS production during early adhesion (30 min) is associated with increased FAK activity and coincides with presumed LMW-PTP inhibition, consistent with a LMW-PTP/FAK supra-molecular complex regulating osteoblast adhesion and spreading.","method":"LMW-PTP siRNA silencing and overexpression, phospho-specific FAK Y397 Western blot, intracellular ROS measurement, osteoblast adhesion assay","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function with site-specific phosphorylation readout, single lab","pmids":["24123071"],"is_preprint":false},{"year":2015,"finding":"Genetic deletion of Acp1 (Lmptp) in mice protects against pressure overload-induced cardiac hypertrophy and heart failure; Acp1-/- mice show attenuated fibrosis, marginal re-expression of fetal cardiac genes, increased insulin receptor beta phosphorylation, increased PKA and ephrin receptor expression, and inactivation of the CaMKIIδ pathway under pressure overload.","method":"Acp1 knockout mouse model, pressure overload (transverse aortic constriction), transcriptional profiling, Western blot signaling analysis, histology","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — in vivo genetic KO with multiple molecular pathway readouts, single lab","pmids":["26213100"],"is_preprint":false},{"year":2015,"finding":"Crystal structures of human LMW-PTP in apo form and complexed with benzylsulfonic acid and benzylphosphonic acid reveal a secondary hydrophobic binding region adjacent to the active site pocket flanked by positively charged residues, suggesting this region may serve as an anchoring site for natural phosphoprotein substrates; competitive inhibitors with IC50 values of 0.047–0.124 mM were identified.","method":"X-ray crystallography (2.1–2.4 Å resolution), in silico docking, enzyme kinetics (competitive inhibition)","journal":"Bioorganic & medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures at multiple resolutions with kinetic validation, single lab but multiple orthogonal methods","pmids":["26117648"],"is_preprint":false},{"year":2018,"finding":"Proteomic analysis of LMW-PTP-silenced A375 melanoma cells identified glycolytic enzymes (α-enolase, pyruvate kinase M2/PKM2, GAPDH, triosephosphate isomerase) as differentially tyrosine-phosphorylated upon LMW-PTP silencing; LMW-PTP silencing enhances glycolytic flux, slows oxidative metabolism, and affects PKM2 tyrosine phosphorylation and nuclear localization.","method":"siRNA silencing, 2D electrophoresis proteomics with anti-phosphotyrosine Western blot, lactate/oxygen consumption assays, PKM2 nuclear localization analysis","journal":"Biochimica et biophysica acta. General subjects","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic substrate identification with functional metabolic readouts, single lab","pmids":["30251652"],"is_preprint":false},{"year":2018,"finding":"In C. elegans, knockdown of lmwptp (the ACP1 homolog Y94H6A.7) enhances resistance to heat shock, oxidative stress, and UV irradiation in wild-type worms via increased DAF-16 nuclear accumulation and enhanced SOD-3 and HSP-16.2 expression; this effect requires the insulin/IGF-1 signaling (IIS) pathway, as lmwptp knockdown did not further reduce stress resistance in daf-16 or hsf-1 mutants but enhanced resistance in daf-2 mutants.","method":"Feeding RNAi knockdown, stress assays, DAF-16 nuclear localization imaging, qRT-PCR, genetic epistasis with IIS pathway mutants","journal":"International journal of biological macromolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in C. elegans ortholog with multiple stress and molecular readouts, single lab","pmids":["29524491"],"is_preprint":false},{"year":2005,"finding":"LMW-PTP isoforms IF-1 and IF-2 show cell-type-specific roles: in vascular smooth muscle cells (VSMCs), both isoforms inhibit PDGF-induced DNA synthesis and migration and suppress PDGF-induced H2O2 generation and p38 activity; in endothelial cells, both isoforms enhance lysophosphatidic acid-stimulated migration without altering DNA synthesis; catalytically inactive LMW-PTP shows opposite effects in ECs but similar effects in VSMCs, indicating different substrates between cell types.","method":"Adenoviral transduction of wild-type and catalytically inactive LMW-PTP isoforms, DNA synthesis assay, migration assay, H2O2 measurement, p38 activity assay","journal":"Journal of receptor and signal transduction research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain/loss-of-function (WT vs catalytic mutant) in two cell types with multiple readouts, single lab","pmids":["15960392"],"is_preprint":false}],"current_model":"ACP1/LMW-PTP is a cytosolic 18 kDa low-molecular-weight protein tyrosine phosphatase that exists as two isoforms (fast/f and slow/s) generated by mutually exclusive alternative splicing; it dephosphorylates activated tyrosine kinase receptors (including PDGFR at Tyr-857, insulin receptor, and EphA2) and signaling proteins (STAT5, FAK, Src, Bcr-Abl) to negatively regulate mitogenic, metabolic, and cytoskeletal signaling; its catalytic cysteines (Cys12/Cys13 and Cys17/Cys18) form a reversible intramolecular disulfide bond under oxidative stress that transiently inactivates the enzyme, with activity restored by the thioltransferase/GSH system, providing a redox-dependent regulatory switch; when phosphorylated at Tyr132, it recruits Grb2 to activate ERK; and its in vivo deletion in mice protects against pressure overload-induced cardiac remodeling, implicating it in regulation of insulin receptor, ephrin, and CaMKIIδ pathways in the heart."},"narrative":{"mechanistic_narrative":"ACP1 encodes a cytosolic 18 kDa low-molecular-weight protein tyrosine phosphatase (LMW-PTP) that functions as a negative regulator of receptor tyrosine kinase and cytoskeletal signaling, dephosphorylating activated kinases to restrain mitogenic, metabolic, and migratory programs [PMID:9299573, PMID:12149261, PMID:15021900]. The gene produces two enzymatically distinct fast (f) and slow (s) isoforms through mutually exclusive alternative splicing of two equal-length 114 bp exons encoding the divergent 40–73 segment, and these isoforms differ in their allosteric modulation by purines [PMID:1939112, PMID:1627603, PMID:8216326, PMID:8586411, PMID:8457591]. Through a catalytic-site cysteine pair (Cys12/Cys17, equivalently Cys13/Cys18), the enzyme acts on phosphotyrosine substrates including cell-surface PDGF receptor specifically at Tyr-857, the insulin receptor beta-subunit, EphA2, STAT5, FAK, and the Src/Bcr-Abl kinases, thereby controlling proliferation, adhesion, endothelial migration, and chemoresistance [PMID:9299573, PMID:12149261, PMID:14637146, PMID:22854047, PMID:22957062]. LMW-PTP activity is gated by a redox switch: reactive oxygen species generated during growth-factor signaling drive formation of an intramolecular disulfide bond or S-glutathionylation at the active-site cysteines that reversibly inactivates the enzyme, with activity restored by the thioltransferase/glutathione system; this transient inactivation permits substrate phosphorylation and, via hyperphosphorylation of Tyr132, recruitment of Grb2 to activate ERK [PMID:11795594, PMID:16890200, PMID:17428749, PMID:22854047]. In vivo, genetic deletion of Acp1 in mice protects against pressure overload-induced cardiac hypertrophy and failure, with increased insulin receptor beta phosphorylation, elevated ephrin receptor expression, and inactivation of the CaMKIId pathway [PMID:26213100]. Crystal structures define the active-site pocket and an adjacent secondary hydrophobic substrate-anchoring region exploited by competitive inhibitors [PMID:26117648].","teleology":[{"year":1991,"claim":"Established the primary structure and isoform basis of ACP1, showing that the two isozymes are single-chain 157-residue proteins differing only in segment 40–73.","evidence":"Protein sequencing of purified isozymes from multiple alleles","pmids":["1939112","1627603"],"confidence":"High","gaps":["Did not establish the genomic mechanism generating the variant segment","No catalytic function assigned at this stage"]},{"year":1993,"claim":"Resolved the genetic mechanism of isoform generation, showing two equal-length exons encoding f- and s-specific segments support mutually exclusive alternative splicing.","evidence":"Genomic sequencing and exon-structure PCR analysis","pmids":["8216326","8586411"],"confidence":"High","gaps":["Did not link isoform choice to functional or substrate differences in vivo","Splicing regulation not characterized"]},{"year":1992,"claim":"Provided the first defined enzymatic activity, identifying FMN as an efficient in vitro substrate and showing cellular FMN phosphatase activity depends on ACP1.","evidence":"In vitro kinetics, cell fractionation, immunoinhibition in CHO cells","pmids":["1336375"],"confidence":"High","gaps":["Physiological relevance of FMN dephosphorylation versus protein substrates unresolved","Phosphotyrosine substrate was a poor substrate in this assay"]},{"year":1993,"claim":"Demonstrated isoform-specific allosteric regulation, showing f and s isozymes are differentially modulated by purines at a parasteric site distinct from the active site.","evidence":"Kinetic analysis of purified homogeneous isozymes","pmids":["8457591"],"confidence":"High","gaps":["Physiological purine effectors in cells not identified","Structural basis of the parasteric site not resolved here"]},{"year":1997,"claim":"Defined LMW-PTP as a negative regulator of insulin signaling, binding the insulin receptor beta-subunit through its catalytic site in a phosphorylation-dependent manner.","evidence":"Dominant-negative C12S overexpression, in vitro binding, glycogen and mitogenesis assays in NIH3T3","pmids":["9299573"],"confidence":"High","gaps":["Direct dephosphorylation of receptor tyrosines not site-mapped","Mechanism of Src-dependent mitogenic branch incompletely defined"]},{"year":2000,"claim":"Distinguished functional pools of LMW-PTP, separating a cytosolic receptor-acting fraction from a cytoskeletal fraction acting on p190RhoGAP.","evidence":"Cell fractionation, dominant-negative overexpression, phosphorylation and migration assays","pmids":["10753664"],"confidence":"Medium","gaps":["Single lab","Molecular basis of cytoskeletal targeting not defined"]},{"year":2001,"claim":"Identified the redox regulatory switch, showing the two catalytic cysteines form a protective intramolecular disulfide and that ROS from growth-factor signaling reversibly inactivate the enzyme.","evidence":"In vitro oxidation, in vivo ROS, glutathione-dependent recovery, cell-based assays","pmids":["11795594"],"confidence":"Medium","gaps":["Review-style synthesis from a single lab","Disulfide assignment not structurally confirmed in this work"]},{"year":2002,"claim":"Established site-selective substrate action, showing LMW-PTP dephosphorylates cell-surface PDGFR specifically at Tyr-857 to suppress kinase activity and downstream effector binding.","evidence":"Cell-based phosphosite analysis, Co-IP, kinase assays","pmids":["12149261"],"confidence":"High","gaps":["Basis for selectivity between receptor pools not structurally defined","Did not address other RTK substrates"]},{"year":2003,"claim":"Extended substrate range to a cytoplasmic transcription factor, showing LMW-PTP associates with and dephosphorylates STAT5 via a defined C-terminal interaction region.","evidence":"Co-IP, phosphatase assays, domain mapping in DAMI cells","pmids":["14637146"],"confidence":"Medium","gaps":["Single study","Functional consequence on STAT5 transcriptional output not quantified"]},{"year":2004,"claim":"Linked LMW-PTP to oncogenic growth through EphA2, showing overexpression drives fibrosarcoma growth via selective EphA2 dephosphorylation.","evidence":"Nude mouse engraftment, receptor phospho-Western, dominant-negative comparison","pmids":["15021900"],"confidence":"Medium","gaps":["Single lab","Direct versus indirect EphA2 dephosphorylation not separated in vivo"]},{"year":2005,"claim":"Revealed cell-type-specific substrate logic, showing both isoforms inhibit PDGF responses in VSMCs but enhance LPA-stimulated migration in endothelial cells with opposite catalytic-mutant effects.","evidence":"Adenoviral WT and catalytic-mutant isoform transduction with DNA synthesis, migration, ROS, p38 assays","pmids":["15960392"],"confidence":"Medium","gaps":["Cell-type-specific substrates not molecularly identified","Single lab"]},{"year":2006,"claim":"Connected redox inactivation to a gain-of-signaling output, showing oxidation drives Tyr132 hyperphosphorylation that docks Grb2 to activate ERK.","evidence":"Site-specific phosphorylation analysis, Grb2 Co-IP, ERK activation assay","pmids":["16890200"],"confidence":"Medium","gaps":["Kinase phosphorylating Tyr132 not identified","Single lab"]},{"year":2007,"claim":"Structurally confirmed the redox switch and its physiological consequence, identifying the C13–C18 disulfide by mass spectrometry and showing TTase/GSH restores activity to limit PDGFR Tyr857 signaling.","evidence":"In vitro activity assays, MS disulfide identification, TTase/GSH reconstitution, TTase-knockout mouse LECs","pmids":["17428749"],"confidence":"High","gaps":["In vivo TTase regulation of LMW-PTP outside lens epithelium not addressed"]},{"year":2012,"claim":"Defined a second reversible redox modification, showing VEGF-induced S-glutathionylation inactivates LMW-PTP to permit transient FAK activation and endothelial migration.","evidence":"S-glutathionylation and activity assays, FAK Co-IP, siRNA, migration assay, redox manipulation","pmids":["22854047"],"confidence":"High","gaps":["Glutathionylated cysteine residue not mapped here","Single lab"]},{"year":2012,"claim":"Implicated LMW-PTP in cancer drug resistance, showing it maintains Src and Bcr-Abl in active states to drive chemoresistance in CML cells.","evidence":"siRNA knockdown and overexpression with kinase phospho-readouts and viability assays","pmids":["22957062"],"confidence":"Medium","gaps":["Direct versus indirect activation of Src/Bcr-Abl not resolved","Single lab"]},{"year":2014,"claim":"Demonstrated control of FAK Tyr397 during adhesion, placing LMW-PTP in a redox-sensitive complex regulating osteoblast spreading.","evidence":"siRNA and overexpression, phospho-FAK Y397 Western, ROS measurement, adhesion assay","pmids":["24123071"],"confidence":"Medium","gaps":["Direct LMW-PTP/FAK complex composition not defined","Single lab"]},{"year":2015,"claim":"Provided in vivo physiological significance, showing Acp1 deletion protects against pressure overload cardiac remodeling with altered insulin receptor, ephrin, and CaMKIId signaling.","evidence":"Acp1 knockout mouse with transverse aortic constriction, transcriptional profiling, signaling Westerns, histology","pmids":["26213100"],"confidence":"High","gaps":["Direct cardiac substrates not site-mapped","Cell-type responsible within the heart not isolated"]},{"year":2015,"claim":"Provided atomic-resolution active-site definition, revealing a secondary hydrophobic substrate-anchoring region and enabling competitive inhibitor design.","evidence":"X-ray crystallography of apo and inhibitor complexes, docking, competitive kinetics","pmids":["26117648"],"confidence":"High","gaps":["No structure of a physiological phosphoprotein substrate complex","Inhibitor selectivity over related phosphatases not addressed"]},{"year":2018,"claim":"Linked LMW-PTP to metabolic reprogramming, identifying glycolytic enzymes including PKM2 as differentially tyrosine-phosphorylated substrates controlling glycolytic flux in melanoma.","evidence":"siRNA silencing, 2D phosphoproteomics, metabolic flux assays, PKM2 nuclear localization analysis","pmids":["30251652"],"confidence":"Medium","gaps":["Direct dephosphorylation of individual glycolytic enzymes not validated","Single lab"]},{"year":2018,"claim":"Established a conserved organismal stress-resistance role, showing ortholog knockdown enhances stress tolerance through DAF-16/insulin-IGF signaling in C. elegans.","evidence":"Feeding RNAi, stress assays, DAF-16 imaging, qRT-PCR, IIS epistasis","pmids":["29524491"],"confidence":"Medium","gaps":["Direct phosphatase substrate in the IIS pathway not identified","Conservation of mechanism to mammals not tested here"]},{"year":null,"claim":"How isoform choice, redox state, and subcellular pool collectively select among the many candidate substrates in a given cell type remains unresolved.","evidence":"No single study integrates isoform-specific substrate selection with redox gating and physiological context","pmids":[],"confidence":"Medium","gaps":["No structure of a physiological substrate complex","No comprehensive in vivo substrate map across tissues","Functional distinction between f and s isoforms in vivo undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,5,8,13,14]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2,5,12,17]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,5,11]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[18]}],"complexes":[],"partners":["INSR","PDGFRB","EPHA2","STAT5","FAK","GRB2","SRC","BCR-ABL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P24666","full_name":"Low molecular weight phosphotyrosine protein phosphatase","aliases":["Adipocyte acid phosphatase","Low molecular weight cytosolic acid phosphatase","Red cell acid phosphatase 1"],"length_aa":158,"mass_kda":18.0,"function":"Acts on tyrosine phosphorylated proteins, low-MW aryl phosphates and natural and synthetic acyl phosphates with differences in substrate specificity between isoform 1 and isoform 2 Does not possess phosphatase activity","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/P24666/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ACP1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ACP1","total_profiled":1310},"omim":[{"mim_id":"609201","title":"UBIQUITIN-ASSOCIATED AND SH3 DOMAIN-CONTAINING PROTEIN B; UBASH3B","url":"https://www.omim.org/entry/609201"},{"mim_id":"191760","title":"URIDYL DIPHOSPHATE GLUCOSE PYROPHOSPHORYLASE 2; UGP2","url":"https://www.omim.org/entry/191760"},{"mim_id":"176830","title":"PROOPIOMELANOCORTIN; POMC","url":"https://www.omim.org/entry/176830"},{"mim_id":"171650","title":"ACID PHOSPHATASE 2, LYSOSOMAL; ACP2","url":"https://www.omim.org/entry/171650"},{"mim_id":"171500","title":"ACID PHOSPHATASE 1, SOLUBLE; ACP1","url":"https://www.omim.org/entry/171500"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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Association with T1D and with past malarial morbidity.","date":"2010","source":"The American journal of the medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/20805743","citation_count":4,"is_preprint":false},{"pmid":"728063","id":"PMC_728063","title":"An examination of the age-related patterns of decay of acid phosphatase (ACP1) in human red cells from individuals of different phenotypes.","date":"1978","source":"Biochemical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/728063","citation_count":4,"is_preprint":false},{"pmid":"38237392","id":"PMC_38237392","title":"Druggable targets of protein tyrosine phosphatase Family, viz. PTP1B, SHP2, Cdc25, and LMW-PTP: Current scenario on medicinal Attributes, and SAR insights.","date":"2024","source":"Bioorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/38237392","citation_count":3,"is_preprint":false},{"pmid":"26216523","id":"PMC_26216523","title":"The effect of ACP1, ADA6 and PTPN22 genetic polymorphisms on the association between p53 codon 72 polymorphism and endometriosis.","date":"2015","source":"Archives of gynecology and obstetrics","url":"https://pubmed.ncbi.nlm.nih.gov/26216523","citation_count":3,"is_preprint":false},{"pmid":"12640337","id":"PMC_12640337","title":"Association of the ACP1 genotype with metabolic parameters upon initial diagnosis of type 1 diabetes.","date":"2003","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/12640337","citation_count":3,"is_preprint":false},{"pmid":"17216808","id":"PMC_17216808","title":"Effect of ACP1*C on early life viability.","date":"2006","source":"Human biology","url":"https://pubmed.ncbi.nlm.nih.gov/17216808","citation_count":3,"is_preprint":false},{"pmid":"25125338","id":"PMC_25125338","title":"Type 1 diabetes mellitus. Comparison between the association with PTPN22 genotype and the association with ACP1-ADA1 joint genotype.","date":"2014","source":"Diabetes research and clinical practice","url":"https://pubmed.ncbi.nlm.nih.gov/25125338","citation_count":3,"is_preprint":false},{"pmid":"18604186","id":"PMC_18604186","title":"[Genetic polymorphisms of low molecular weight protein tyrosine phosphatase (LMW-PTP): relationship with erythrocyte enzymatic phenotype in patients with Systemic Lupus Erythematosus].","date":"2008","source":"Acta reumatologica portuguesa","url":"https://pubmed.ncbi.nlm.nih.gov/18604186","citation_count":3,"is_preprint":false},{"pmid":"2613255","id":"PMC_2613255","title":"Human red-cell acid phosphatase (ACP1): a new mutant (ACP1*KUK) detected by isoelectric focusing, kinetics of thermostability and substrate activity.","date":"1989","source":"Human heredity","url":"https://pubmed.ncbi.nlm.nih.gov/2613255","citation_count":3,"is_preprint":false},{"pmid":"23201490","id":"PMC_23201490","title":"Small amplicons high resolution melting analysis (SA-HRMA) allows successful genotyping of acid phosphatase 1 (ACP1) polymorphisms in the Italian population.","date":"2012","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23201490","citation_count":3,"is_preprint":false},{"pmid":"2155993","id":"PMC_2155993","title":"Evaluation of a nonequilibrium isoelectric focusing (IEF) method for the simultaneous typing of esterase D (EsD), red cell acid phosphatase (AcP1), phosphoglucomutase (PGM1), adenylate kinase (AK), and adenosine deaminase (ADA).","date":"1990","source":"Journal of forensic sciences","url":"https://pubmed.ncbi.nlm.nih.gov/2155993","citation_count":3,"is_preprint":false},{"pmid":"30447286","id":"PMC_30447286","title":"Vibrio cholerae LMWPTP-2 display unique surface charge and grooves around the active site: Indicative of distinctive substrate specificity and scope to design specific inhibitor.","date":"2018","source":"Biochimica et biophysica acta. Proteins and proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/30447286","citation_count":2,"is_preprint":false},{"pmid":"12556238","id":"PMC_12556238","title":"Simultaneous detection of ACP1 and GC genotypes using PCR/SSCP.","date":"2003","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12556238","citation_count":2,"is_preprint":false},{"pmid":"16973312","id":"PMC_16973312","title":"ACP1 and offspring sex ratio in smoking puerperae: a study at population level.","date":"2006","source":"Early human development","url":"https://pubmed.ncbi.nlm.nih.gov/16973312","citation_count":2,"is_preprint":false},{"pmid":"1647290","id":"PMC_1647290","title":"Mapping of silver fox genes: chromosomal localization of the genes for GOT2, AK1, ALDOC, ACP1, ITPA, PGP, and BLVR.","date":"1991","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/1647290","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":43657,"output_tokens":5746,"usd":0.10858,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14295,"output_tokens":5237,"usd":0.1012,"stage2_stop_reason":"end_turn"},"total_usd":0.20978,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1991,\n      \"finding\": \"The two isozymes (Bf and Bs) encoded by the ACP1*B allele are not glycosylated, consist of a single peptide chain of 157 amino acid residues acetylated at the amino-terminal alanine, and differ only in the sequence segment 40-73, consistent with generation by alternative splicing of the primary RNA transcript.\",\n      \"method\": \"Protein sequencing of purified isozymes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct amino acid sequencing of purified proteins, replicated across multiple alleles (A, B, C) in two independent papers (PMID:1939112, PMID:1627603)\",\n      \"pmids\": [\"1939112\", \"1627603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The ACP1 gene contains six linearly positioned exons (covering codons 14-157) including two exons of equal length (114 bp) encoding the f and s specific segments respectively, interspaced by a short probably non-functional intron, strongly supporting mutually exclusive alternative RNA splicing as the mechanism generating f and s isoforms.\",\n      \"method\": \"Genomic sequencing and exon structure analysis by PCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genomic sequencing establishing gene structure, replicated and extended by PMID:8586411 full gene characterization\",\n      \"pmids\": [\"8216326\", \"8586411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"In vitro kinetic analysis showed that the ACP1 gene product (18 kDa acid phosphatase) utilizes flavin mononucleotide (FMN) as an efficient substrate (kcat/Km = 7.3×10³ s⁻¹M⁻¹), while the tyrosyl-phosphorylated form of adipocyte lipid binding protein is a relatively poor substrate (kcat/Km = 0.17 s⁻¹M⁻¹); all soluble FMN phosphatase activity in CHO cells was inhibited by anti-ACP1 antibodies, suggesting the enzyme functions as an FMN phosphatase in vivo.\",\n      \"method\": \"In vitro kinetic assay, cell fractionation, immunoinhibition with specific antibodies in CHO cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstituted in vitro kinetics plus immunoinhibition of cellular activity, single lab with two orthogonal methods\",\n      \"pmids\": [\"1336375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The fast (f) and slow (s) ACP1 isoforms show markedly differential activity modulation by purines: kcat of f isoforms is increased 5.1-fold by hypoxanthine and decreased 40% by adenine, while kcat of s isoforms is unaffected by hypoxanthine but increased 4.6-fold by adenine; kinetics indicate effectors bind to free enzyme and enzyme-substrate complex at a site distinct from the substrate-binding site (parasteric binding).\",\n      \"method\": \"Kinetic analysis of purified homogeneous isozymes\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous kinetic characterization of purified isozymes with mechanistic interpretation, single lab\",\n      \"pmids\": [\"8457591\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"LMW-PTP (ACP1) acts as a negative regulator of insulin-mediated signaling: dominant-negative LMW-PTP (C12S mutant) associates with the beta-subunit of the insulin receptor in a phosphorylation-dependent manner via the catalytic site; overexpression of dnLMW-PTP increases glycogenosynthesis and mitosis; LMW-PTP specifically regulates insulin mitogenesis through a c-Src kinase-dependent pathway, independent of PI3K and ERK.\",\n      \"method\": \"Dominant-negative overexpression in NIH3T3 cells, in vitro binding assay, orthovanadate competition, glycogen synthesis assay, thymidine incorporation, signal pathway analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/pulldown with dominant-negative mutant, in vitro binding competition, multiple functional readouts in single lab\",\n      \"pmids\": [\"9299573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"LMW-PTP preferentially acts on cell-surface PDGF receptor (excluding internalized receptor pool) and exerts site-selective dephosphorylation specifically at Tyr-857 in the kinase activation loop of PDGF-r, thereby reducing kinase activity and downstream binding of PI3K, SHP-2, and PLCγ1, while having only slight effect on Tyr-716 (which directs MAPK/Grb2 signaling).\",\n      \"method\": \"Cell-based phosphorylation assays, site-specific mutagenesis/phosphosite analysis, co-immunoprecipitation, kinase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific dephosphorylation demonstrated with multiple downstream readouts, single lab with orthogonal methods\",\n      \"pmids\": [\"12149261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"LMW-PTP contains two catalytic pocket cysteines (Cys12 and Cys17); the enzyme is oxidized and inactivated by both exogenous and endogenously generated (PDGF signaling) ROS in vivo; recovery of activity is glutathione-dependent; Cys17 forms an intramolecular S-S bond with Cys12 that protects the catalytic cysteine from irreversible oxidation; LMW-PTP is reduced/activated during contact inhibition and myoblast differentiation, supporting a role as a growth inhibition modulator.\",\n      \"method\": \"In vitro oxidation assays, in vivo ROS measurements, glutathione-dependent activity recovery, cell-based functional assays (contact inhibition, differentiation)\",\n      \"journal\": \"IUBMB life\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple functional readouts described in review-style paper; original experiments cited but abstract is a synthesis; single lab\",\n      \"pmids\": [\"11795594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"LMW-PTP exists in two intracellular pools: cytosolic (which interacts directly with activated insulin or PDGF receptors) and cytoskeleton-associated (which becomes tyrosine phosphorylated upon PDGF stimulation and acts on p190Rho-GAP to regulate cytoskeleton rearrangement); PDGF but not insulin stimulation leads to tyrosine phosphorylation of LMW-PTP, explaining differential signaling effects.\",\n      \"method\": \"Cell fractionation, dominant-negative LMW-PTP overexpression, tyrosine phosphorylation assays, adhesion and chemotaxis assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — subcellular fractionation with functional consequences, single lab\",\n      \"pmids\": [\"10753664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"LMW-PTP associates with and dephosphorylates STAT5 in DAMI megakaryoblastic cells; the interaction does not exclusively involve the phosphatase active site; an essential region of interaction was identified at the STAT5 C-terminus, coinciding with a previously hypothesized PTP-associating domain of nine amino acids.\",\n      \"method\": \"Co-immunoprecipitation, phosphatase activity assay, domain-mapping experiments in DAMI cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — reciprocal Co-IP with domain mapping, single lab, single study\",\n      \"pmids\": [\"14637146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"During PMA-induced megakaryocyte differentiation, LMW-PTP interaction with STAT5 depends on STAT5 threonine phosphorylation at residue Thr757; protein kinase C inhibition prevents PMA-induced STAT5 Thr phosphorylation and LMW-PTP association; a Thr757Val STAT5 mutant disrupts the LMW-PTP/STAT5 interaction, though phosphorylation of this residue itself is not required.\",\n      \"method\": \"Mutagenesis of STAT5 (Thr757Val), pharmacological PKC inhibition, co-immunoprecipitation\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis plus pharmacological inhibition identifying essential residue, single lab two orthogonal approaches\",\n      \"pmids\": [\"18197699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"LMW-PTP overexpression in NIH3T3 fibroblasts engrafted in nude mice induces larger fibrosarcomas with higher proliferation compared to controls; in sarcoma extracts, LMW-PTP overexpression specifically dephosphorylates EphA2 (but not PDGF receptor or beta-catenin tyrosine phosphorylation), suggesting LMW-PTP oncogenic potential is mediated by EphA2 dephosphorylation.\",\n      \"method\": \"In vivo tumor engraftment in nude mice, Western blot for receptor phosphorylation, dominant-negative LMW-PTP comparison\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo model with molecular substrate identification, single lab\",\n      \"pmids\": [\"15021900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Oxidative stress triggers LMW-PTP inactivation and consequent hyper-phosphorylation of Tyr132, which acts as a docking site for the adaptor protein Grb2; enhanced Grb2 recruitment to LMW-PTP leads to ERK activation, providing a redox-dependent prosurvival signaling switch.\",\n      \"method\": \"Phosphorylation site-specific analysis, co-immunoprecipitation of Grb2 with LMW-PTP, ERK activation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — site-specific phosphorylation with co-IP and downstream readout, single lab\",\n      \"pmids\": [\"16890200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Recombinant LMW-PTP purified from human lens epithelial cells displays tyrosine-specific phosphatase activity; it is inactivated by H2O2 via formation of an intramolecular disulfide bond between C13 and C18 (at the active site, confirmed by mass spectrometry); activity is restored by the thioltransferase (TTase)/GSH system; in TTase-knockout mouse lens epithelial cells, LMW-PTP activity is progressively lost after PDGF stimulation, resulting in sustained phosphorylation of PDGF receptor Tyr857 and downstream Akt and ERK1/2.\",\n      \"method\": \"In vitro activity assay, mass spectrometry (disulfide bond identification), TTase/GSH reconstitution, TTase knockout mouse LECs\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS structural confirmation of disulfide bond, in vitro reconstitution, genetic KO validation, single lab multiple orthogonal methods\",\n      \"pmids\": [\"17428749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VEGF causes reversible S-glutathionylation of LMW-PTP in human microvascular endothelial cells, which inhibits LMW-PTP phosphorylation and activity; this allows transient FAK activation and association with LMW-PTP, promoting endothelial cell migration; oxidative or reductive shifts prevent VEGF-mediated S-glutathionylation and FAK activation, blocking migration; LMW-PTP knockdown markedly enhances FAK activation and migration.\",\n      \"method\": \"S-glutathionylation assay, LMW-PTP activity assay, co-immunoprecipitation (FAK/LMW-PTP), siRNA knockdown, cell migration assay, pharmacological redox manipulation\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal approaches (biochemical PTM assay, Co-IP, KD, functional migration), single lab\",\n      \"pmids\": [\"22854047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"LMW-PTP knockdown in chemoresistant CML cells (Lucena-1) reverts resistance to vincristine and imatinib mesylate, accompanied by decreased Src and Bcr-Abl phosphorylation at activating sites; conversely, LMW-PTP overexpression in K562 cells induces vincristine resistance, demonstrating LMW-PTP maintains Src and Bcr-Abl in active states.\",\n      \"method\": \"siRNA knockdown, LMW-PTP overexpression, kinase phosphorylation assays, cell viability assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with defined molecular readouts, single lab\",\n      \"pmids\": [\"22957062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"LMW-PTP controls FAK phosphorylation at Tyr397 during osteoblast adhesion: silencing LMW-PTP increases FAK Y397 phosphorylation, while overexpression decreases it; ROS production during early adhesion (30 min) is associated with increased FAK activity and coincides with presumed LMW-PTP inhibition, consistent with a LMW-PTP/FAK supra-molecular complex regulating osteoblast adhesion and spreading.\",\n      \"method\": \"LMW-PTP siRNA silencing and overexpression, phospho-specific FAK Y397 Western blot, intracellular ROS measurement, osteoblast adhesion assay\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function with site-specific phosphorylation readout, single lab\",\n      \"pmids\": [\"24123071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Genetic deletion of Acp1 (Lmptp) in mice protects against pressure overload-induced cardiac hypertrophy and heart failure; Acp1-/- mice show attenuated fibrosis, marginal re-expression of fetal cardiac genes, increased insulin receptor beta phosphorylation, increased PKA and ephrin receptor expression, and inactivation of the CaMKIIδ pathway under pressure overload.\",\n      \"method\": \"Acp1 knockout mouse model, pressure overload (transverse aortic constriction), transcriptional profiling, Western blot signaling analysis, histology\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic KO with multiple molecular pathway readouts, single lab\",\n      \"pmids\": [\"26213100\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Crystal structures of human LMW-PTP in apo form and complexed with benzylsulfonic acid and benzylphosphonic acid reveal a secondary hydrophobic binding region adjacent to the active site pocket flanked by positively charged residues, suggesting this region may serve as an anchoring site for natural phosphoprotein substrates; competitive inhibitors with IC50 values of 0.047–0.124 mM were identified.\",\n      \"method\": \"X-ray crystallography (2.1–2.4 Å resolution), in silico docking, enzyme kinetics (competitive inhibition)\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures at multiple resolutions with kinetic validation, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"26117648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Proteomic analysis of LMW-PTP-silenced A375 melanoma cells identified glycolytic enzymes (α-enolase, pyruvate kinase M2/PKM2, GAPDH, triosephosphate isomerase) as differentially tyrosine-phosphorylated upon LMW-PTP silencing; LMW-PTP silencing enhances glycolytic flux, slows oxidative metabolism, and affects PKM2 tyrosine phosphorylation and nuclear localization.\",\n      \"method\": \"siRNA silencing, 2D electrophoresis proteomics with anti-phosphotyrosine Western blot, lactate/oxygen consumption assays, PKM2 nuclear localization analysis\",\n      \"journal\": \"Biochimica et biophysica acta. General subjects\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic substrate identification with functional metabolic readouts, single lab\",\n      \"pmids\": [\"30251652\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In C. elegans, knockdown of lmwptp (the ACP1 homolog Y94H6A.7) enhances resistance to heat shock, oxidative stress, and UV irradiation in wild-type worms via increased DAF-16 nuclear accumulation and enhanced SOD-3 and HSP-16.2 expression; this effect requires the insulin/IGF-1 signaling (IIS) pathway, as lmwptp knockdown did not further reduce stress resistance in daf-16 or hsf-1 mutants but enhanced resistance in daf-2 mutants.\",\n      \"method\": \"Feeding RNAi knockdown, stress assays, DAF-16 nuclear localization imaging, qRT-PCR, genetic epistasis with IIS pathway mutants\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in C. elegans ortholog with multiple stress and molecular readouts, single lab\",\n      \"pmids\": [\"29524491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"LMW-PTP isoforms IF-1 and IF-2 show cell-type-specific roles: in vascular smooth muscle cells (VSMCs), both isoforms inhibit PDGF-induced DNA synthesis and migration and suppress PDGF-induced H2O2 generation and p38 activity; in endothelial cells, both isoforms enhance lysophosphatidic acid-stimulated migration without altering DNA synthesis; catalytically inactive LMW-PTP shows opposite effects in ECs but similar effects in VSMCs, indicating different substrates between cell types.\",\n      \"method\": \"Adenoviral transduction of wild-type and catalytically inactive LMW-PTP isoforms, DNA synthesis assay, migration assay, H2O2 measurement, p38 activity assay\",\n      \"journal\": \"Journal of receptor and signal transduction research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain/loss-of-function (WT vs catalytic mutant) in two cell types with multiple readouts, single lab\",\n      \"pmids\": [\"15960392\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ACP1/LMW-PTP is a cytosolic 18 kDa low-molecular-weight protein tyrosine phosphatase that exists as two isoforms (fast/f and slow/s) generated by mutually exclusive alternative splicing; it dephosphorylates activated tyrosine kinase receptors (including PDGFR at Tyr-857, insulin receptor, and EphA2) and signaling proteins (STAT5, FAK, Src, Bcr-Abl) to negatively regulate mitogenic, metabolic, and cytoskeletal signaling; its catalytic cysteines (Cys12/Cys13 and Cys17/Cys18) form a reversible intramolecular disulfide bond under oxidative stress that transiently inactivates the enzyme, with activity restored by the thioltransferase/GSH system, providing a redox-dependent regulatory switch; when phosphorylated at Tyr132, it recruits Grb2 to activate ERK; and its in vivo deletion in mice protects against pressure overload-induced cardiac remodeling, implicating it in regulation of insulin receptor, ephrin, and CaMKIIδ pathways in the heart.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ACP1 encodes a cytosolic 18 kDa low-molecular-weight protein tyrosine phosphatase (LMW-PTP) that functions as a negative regulator of receptor tyrosine kinase and cytoskeletal signaling, dephosphorylating activated kinases to restrain mitogenic, metabolic, and migratory programs [#4, #5, #10]. The gene produces two enzymatically distinct fast (f) and slow (s) isoforms through mutually exclusive alternative splicing of two equal-length 114 bp exons encoding the divergent 40\\u201373 segment, and these isoforms differ in their allosteric modulation by purines [#0, #1, #3]. Through a catalytic-site cysteine pair (Cys12/Cys17, equivalently Cys13/Cys18), the enzyme acts on phosphotyrosine substrates including cell-surface PDGF receptor specifically at Tyr-857, the insulin receptor beta-subunit, EphA2, STAT5, FAK, and the Src/Bcr-Abl kinases, thereby controlling proliferation, adhesion, endothelial migration, and chemoresistance [#4, #5, #8, #13, #14]. LMW-PTP activity is gated by a redox switch: reactive oxygen species generated during growth-factor signaling drive formation of an intramolecular disulfide bond or S-glutathionylation at the active-site cysteines that reversibly inactivates the enzyme, with activity restored by the thioltransferase/glutathione system; this transient inactivation permits substrate phosphorylation and, via hyperphosphorylation of Tyr132, recruitment of Grb2 to activate ERK [#6, #11, #12, #13]. In vivo, genetic deletion of Acp1 in mice protects against pressure overload-induced cardiac hypertrophy and failure, with increased insulin receptor beta phosphorylation, elevated ephrin receptor expression, and inactivation of the CaMKIId pathway [#16]. Crystal structures define the active-site pocket and an adjacent secondary hydrophobic substrate-anchoring region exploited by competitive inhibitors [#17].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Established the primary structure and isoform basis of ACP1, showing that the two isozymes are single-chain 157-residue proteins differing only in segment 40\\u201373.\",\n      \"evidence\": \"Protein sequencing of purified isozymes from multiple alleles\",\n      \"pmids\": [\"1939112\", \"1627603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the genomic mechanism generating the variant segment\", \"No catalytic function assigned at this stage\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Resolved the genetic mechanism of isoform generation, showing two equal-length exons encoding f- and s-specific segments support mutually exclusive alternative splicing.\",\n      \"evidence\": \"Genomic sequencing and exon-structure PCR analysis\",\n      \"pmids\": [\"8216326\", \"8586411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not link isoform choice to functional or substrate differences in vivo\", \"Splicing regulation not characterized\"]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Provided the first defined enzymatic activity, identifying FMN as an efficient in vitro substrate and showing cellular FMN phosphatase activity depends on ACP1.\",\n      \"evidence\": \"In vitro kinetics, cell fractionation, immunoinhibition in CHO cells\",\n      \"pmids\": [\"1336375\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological relevance of FMN dephosphorylation versus protein substrates unresolved\", \"Phosphotyrosine substrate was a poor substrate in this assay\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Demonstrated isoform-specific allosteric regulation, showing f and s isozymes are differentially modulated by purines at a parasteric site distinct from the active site.\",\n      \"evidence\": \"Kinetic analysis of purified homogeneous isozymes\",\n      \"pmids\": [\"8457591\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological purine effectors in cells not identified\", \"Structural basis of the parasteric site not resolved here\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defined LMW-PTP as a negative regulator of insulin signaling, binding the insulin receptor beta-subunit through its catalytic site in a phosphorylation-dependent manner.\",\n      \"evidence\": \"Dominant-negative C12S overexpression, in vitro binding, glycogen and mitogenesis assays in NIH3T3\",\n      \"pmids\": [\"9299573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct dephosphorylation of receptor tyrosines not site-mapped\", \"Mechanism of Src-dependent mitogenic branch incompletely defined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Distinguished functional pools of LMW-PTP, separating a cytosolic receptor-acting fraction from a cytoskeletal fraction acting on p190RhoGAP.\",\n      \"evidence\": \"Cell fractionation, dominant-negative overexpression, phosphorylation and migration assays\",\n      \"pmids\": [\"10753664\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Molecular basis of cytoskeletal targeting not defined\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identified the redox regulatory switch, showing the two catalytic cysteines form a protective intramolecular disulfide and that ROS from growth-factor signaling reversibly inactivate the enzyme.\",\n      \"evidence\": \"In vitro oxidation, in vivo ROS, glutathione-dependent recovery, cell-based assays\",\n      \"pmids\": [\"11795594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review-style synthesis from a single lab\", \"Disulfide assignment not structurally confirmed in this work\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Established site-selective substrate action, showing LMW-PTP dephosphorylates cell-surface PDGFR specifically at Tyr-857 to suppress kinase activity and downstream effector binding.\",\n      \"evidence\": \"Cell-based phosphosite analysis, Co-IP, kinase assays\",\n      \"pmids\": [\"12149261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis for selectivity between receptor pools not structurally defined\", \"Did not address other RTK substrates\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Extended substrate range to a cytoplasmic transcription factor, showing LMW-PTP associates with and dephosphorylates STAT5 via a defined C-terminal interaction region.\",\n      \"evidence\": \"Co-IP, phosphatase assays, domain mapping in DAMI cells\",\n      \"pmids\": [\"14637146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single study\", \"Functional consequence on STAT5 transcriptional output not quantified\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linked LMW-PTP to oncogenic growth through EphA2, showing overexpression drives fibrosarcoma growth via selective EphA2 dephosphorylation.\",\n      \"evidence\": \"Nude mouse engraftment, receptor phospho-Western, dominant-negative comparison\",\n      \"pmids\": [\"15021900\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct versus indirect EphA2 dephosphorylation not separated in vivo\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed cell-type-specific substrate logic, showing both isoforms inhibit PDGF responses in VSMCs but enhance LPA-stimulated migration in endothelial cells with opposite catalytic-mutant effects.\",\n      \"evidence\": \"Adenoviral WT and catalytic-mutant isoform transduction with DNA synthesis, migration, ROS, p38 assays\",\n      \"pmids\": [\"15960392\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-type-specific substrates not molecularly identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Connected redox inactivation to a gain-of-signaling output, showing oxidation drives Tyr132 hyperphosphorylation that docks Grb2 to activate ERK.\",\n      \"evidence\": \"Site-specific phosphorylation analysis, Grb2 Co-IP, ERK activation assay\",\n      \"pmids\": [\"16890200\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase phosphorylating Tyr132 not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Structurally confirmed the redox switch and its physiological consequence, identifying the C13\\u2013C18 disulfide by mass spectrometry and showing TTase/GSH restores activity to limit PDGFR Tyr857 signaling.\",\n      \"evidence\": \"In vitro activity assays, MS disulfide identification, TTase/GSH reconstitution, TTase-knockout mouse LECs\",\n      \"pmids\": [\"17428749\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo TTase regulation of LMW-PTP outside lens epithelium not addressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined a second reversible redox modification, showing VEGF-induced S-glutathionylation inactivates LMW-PTP to permit transient FAK activation and endothelial migration.\",\n      \"evidence\": \"S-glutathionylation and activity assays, FAK Co-IP, siRNA, migration assay, redox manipulation\",\n      \"pmids\": [\"22854047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glutathionylated cysteine residue not mapped here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Implicated LMW-PTP in cancer drug resistance, showing it maintains Src and Bcr-Abl in active states to drive chemoresistance in CML cells.\",\n      \"evidence\": \"siRNA knockdown and overexpression with kinase phospho-readouts and viability assays\",\n      \"pmids\": [\"22957062\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect activation of Src/Bcr-Abl not resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated control of FAK Tyr397 during adhesion, placing LMW-PTP in a redox-sensitive complex regulating osteoblast spreading.\",\n      \"evidence\": \"siRNA and overexpression, phospho-FAK Y397 Western, ROS measurement, adhesion assay\",\n      \"pmids\": [\"24123071\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct LMW-PTP/FAK complex composition not defined\", \"Single lab\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided in vivo physiological significance, showing Acp1 deletion protects against pressure overload cardiac remodeling with altered insulin receptor, ephrin, and CaMKIId signaling.\",\n      \"evidence\": \"Acp1 knockout mouse with transverse aortic constriction, transcriptional profiling, signaling Westerns, histology\",\n      \"pmids\": [\"26213100\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct cardiac substrates not site-mapped\", \"Cell-type responsible within the heart not isolated\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided atomic-resolution active-site definition, revealing a secondary hydrophobic substrate-anchoring region and enabling competitive inhibitor design.\",\n      \"evidence\": \"X-ray crystallography of apo and inhibitor complexes, docking, competitive kinetics\",\n      \"pmids\": [\"26117648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of a physiological phosphoprotein substrate complex\", \"Inhibitor selectivity over related phosphatases not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked LMW-PTP to metabolic reprogramming, identifying glycolytic enzymes including PKM2 as differentially tyrosine-phosphorylated substrates controlling glycolytic flux in melanoma.\",\n      \"evidence\": \"siRNA silencing, 2D phosphoproteomics, metabolic flux assays, PKM2 nuclear localization analysis\",\n      \"pmids\": [\"30251652\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct dephosphorylation of individual glycolytic enzymes not validated\", \"Single lab\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established a conserved organismal stress-resistance role, showing ortholog knockdown enhances stress tolerance through DAF-16/insulin-IGF signaling in C. elegans.\",\n      \"evidence\": \"Feeding RNAi, stress assays, DAF-16 imaging, qRT-PCR, IIS epistasis\",\n      \"pmids\": [\"29524491\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct phosphatase substrate in the IIS pathway not identified\", \"Conservation of mechanism to mammals not tested here\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How isoform choice, redox state, and subcellular pool collectively select among the many candidate substrates in a given cell type remains unresolved.\",\n      \"evidence\": \"No single study integrates isoform-specific substrate selection with redox gating and physiological context\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of a physiological substrate complex\", \"No comprehensive in vivo substrate map across tissues\", \"Functional distinction between f and s isoforms in vivo undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 5, 8, 13, 14]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 5, 12, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 5, 11]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [18]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"INSR\", \"PDGFRB\", \"EPHA2\", \"STAT5\", \"FAK\", \"GRB2\", \"SRC\", \"BCR-ABL\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}