{"gene":"GAPDH","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1995,"finding":"Nitric oxide (via S-nitrosoglutathione) inhibits GAPDH by reversible S-nitrosylation of the active-site cysteine residue; inhibition required stoichiometric addition of ~1 mol NO per mol GAPDH monomer and was reversed by low-molecular-weight thiols, ruling out ADP-ribosylation as the primary mechanism.","method":"In vitro enzyme assay with purified GAPDH and endothelial cells; substrate-protection experiments; thiol-reversal assays; quantitative nitrosylation measurement","journal":"The American Journal of Physiology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified enzyme, stoichiometric quantification, substrate-protection controls, and reversal by thiols; mechanistically definitive","pmids":["7573405"],"is_preprint":false},{"year":2006,"finding":"Diverse apoptotic stimuli activate iNOS/nNOS, leading to S-nitrosylation of GAPDH at Cys150 (rat), which abrogates catalytic activity and enables GAPDH to bind the E3-ubiquitin-ligase Siah1; the GAPDH–Siah1 complex translocates to the nucleus via Siah1's nuclear localization signal, where it stabilizes Siah1 and triggers cytotoxicity.","method":"Co-immunoprecipitation; NOS inhibitor and GAPDH-Siah binding interference experiments; nuclear translocation assays; apoptosis readouts","journal":"Biochimica et Biophysica Acta / Cellular and Molecular Neurobiology (review of original work)","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across multiple labs; reciprocal co-IP; functional interference (blocking GAPDH-Siah binding prevents death); site-directed mutagenesis at Cys150","pmids":["16574384","16633896"],"is_preprint":false},{"year":2008,"finding":"Nuclear GAPDH (translocated after S-nitrosylation) is acetylated at Lys160 by the acetyltransferase p300/CBP via direct protein interaction; this in turn stimulates p300/CBP catalytic activity, activating downstream targets including p53 to cause apoptosis. A K160R dominant-negative GAPDH mutant blocks p300/CBP activation and reduces cell death.","method":"Co-immunoprecipitation; acetyltransferase activity assays; dominant-negative GAPDH K160R mutagenesis; apoptosis gene expression and cell-death quantification","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct protein interaction by Co-IP, enzymatic activity assay of p300/CBP, mutagenesis (K160R), and apoptosis readout in single rigorous study","pmids":["18552833"],"is_preprint":false},{"year":2008,"finding":"In fission yeast, the GAPDH isoform Tdh1 physically associates with the Mcs4 response regulator and stress-responsive MAPKKKs; H2O2 stress transiently oxidizes Cys152 of Tdh1, enhancing its association with Mcs4 and enabling phosphorelay signaling to the MAP kinase cascade, placing GAPDH as an essential redox-sensing component of the peroxide-stress phosphorelay.","method":"Co-immunoprecipitation; genetic epistasis (Tdh1 deletion abolishes Mpr1-Mcs4 interaction and phosphorelay); Cys152 oxidation monitoring","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, genetic epistasis (deletion phenotype), and redox-cysteine modification measured; single lab but multiple orthogonal methods","pmids":["18406331"],"is_preprint":false},{"year":2009,"finding":"A cytosolic 52 kDa protein named GOSPEL physiologically binds GAPDH, competing with Siah1 for GAPDH binding and thereby retaining GAPDH in the cytosol and preventing nuclear translocation. S-nitrosylation of GOSPEL at Cys47 enhances GAPDH–GOSPEL binding and its neuroprotective effect; GOSPEL overexpression protects neurons from NMDA excitotoxicity while its depletion enhances death.","method":"Co-immunoprecipitation; competition binding assays (GOSPEL vs. Siah1 for GAPDH); GOSPEL overexpression and knockdown in primary neuron cultures; in vivo viral delivery in mice; S-nitrosylation site mutagenesis (C47)","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, competition binding, mutagenesis (C47), in vivo neuronal protection; multiple orthogonal methods in one rigorous study","pmids":["19607794"],"is_preprint":false},{"year":2010,"finding":"S-nitrosylated GAPDH (SNO-GAPDH) translocates to the nucleus and transnitrosylates nuclear proteins including SIRT1, HDAC2, and DNA-PK, providing a mechanism for targeted nitrosylation of nuclear proteins by cytoplasmic NO sources.","method":"Co-immunoprecipitation; transnitrosylation assays with purified SNO-GAPDH and nuclear protein targets; cell-based nuclear translocation; site-directed mutagenesis at Cys150","journal":"Nature Cell Biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro transnitrosylation with purified proteins plus cell-based Co-IP; independent replication of the SNO-GAPDH nuclear translocation mechanism","pmids":["20972425"],"is_preprint":false},{"year":2015,"finding":"High-dose vitamin C (as dehydroascorbate, DHA) is taken up by GLUT1, reduced intracellularly to vitamin C while depleting glutathione, causing ROS accumulation that inactivates GAPDH; this inhibition of GAPDH in highly glycolytic KRAS- or BRAF-mutant colorectal cancer cells causes an energetic crisis and selective cell death.","method":"Cellular viability assays; GAPDH activity measurement after DHA treatment; ROS and glutathione quantification; KRAS/BRAF mutant vs. wild-type comparison; in vivo Apc/KrasG12D mouse model","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple cell lines, genetic mutant comparisons, enzymatic activity assay, in vivo tumor model; replicated across multiple experimental systems in one study","pmids":["26541605"],"is_preprint":false},{"year":2018,"finding":"Dimethyl fumarate (DMF) succinates and covalently inactivates the catalytic cysteine (Cys152) of GAPDH both in vitro and in vivo in mice and humans; this inhibition down-regulates aerobic glycolysis in activated myeloid and lymphoid cells and mediates DMF's anti-inflammatory effects.","method":"In vitro GAPDH enzyme activity assay; mass spectrometry identification of succination at Cys152; cell metabolic flux analysis; in vivo mouse experiments; immune cell functional readouts","journal":"Science","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic assay, MS-confirmed covalent modification site, in vivo validation, replicated in both mouse and human cells","pmids":["29599194"],"is_preprint":false},{"year":2018,"finding":"CARM1 (PRMT4) methylates GAPDH at Arg234, inhibiting its catalytic activity; glucose starvation upregulates CARM1, leading to hypermethylation and GAPDH inhibition. Re-expression of wild-type but not methylation-mimetic GAPDH restores glycolytic levels, and R234 hypomethylation is found in hepatocellular carcinoma relative to normal tissue.","method":"In vitro methyltransferase assay; GAPDH activity assay; R234 methylation-mimetic mutant rescue experiments; in vitro and in vivo tumor proliferation; clinical HCC sample analysis by MS","journal":"Cell Reports","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro methylation assay, mutagenesis rescue, in vivo tumor model, and clinical sample validation; multiple orthogonal methods","pmids":["30232003"],"is_preprint":false},{"year":2019,"finding":"4-Octyl itaconate (4-OI) directly alkylates Cys22 of GAPDH, reducing its enzymatic activity; U13C glucose tracing confirmed blockade of glycolytic flux at GAPDH; anti-inflammatory effects of 4-OI in macrophages are abrogated by overexpression of C22A mutant GAPDH but rescued by wild-type GAPDH.","method":"In vitro GAPDH alkylation and activity assay; isotope-tracing metabolic flux analysis (U13C glucose); C22A GAPDH mutagenesis rescue; LPS-lethality in vivo model","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct covalent modification at defined cysteine confirmed biochemically, isotope tracing, site-directed mutagenesis rescue, and in vivo validation","pmids":["31704924"],"is_preprint":false},{"year":2012,"finding":"GAPDH interacts with the telomerase RNA component (TERC) via its NAD+-binding Rossmann fold, inhibits telomerase activity, and induces telomere shortening and breast cancer cell senescence; a lysine residue in the catalytic domain is required for this inhibition; substrate G3P and the NO donor GSNO negatively regulate GAPDH inhibition of telomerase.","method":"Co-immunoprecipitation; telomerase activity assay (TRAP); domain-mapping mutagenesis; telomere length measurement; cellular senescence assay","journal":"PNAS","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, enzymatic assay, domain mutagenesis; single lab with multiple orthogonal methods","pmids":["22847419"],"is_preprint":false},{"year":2014,"finding":"Nuclear GAPDH (translocated via Siah1-dependent mechanism upon glutamate stimulation) forms a protein complex with p53, enhancing p53 expression and phosphorylation; disruption of GAPDH–p53 interaction by a peptide blocks glutamate-induced cell death and protects against ischemia-induced neuronal death in vivo in rats.","method":"Co-immunoprecipitation; interfering peptide disruption; p53 expression and phosphorylation assays; in vivo rat tMCAo stroke model","journal":"Molecular Brain","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, peptide interference with defined molecular readout, in vivo model; single lab","pmids":["24670206"],"is_preprint":false},{"year":2020,"finding":"GAPDH functions as a heme chaperone that delivers heme to apo-soluble guanylyl cyclase β1 (apo-sGCβ): apo-sGCβ associates with GAPDH in cells and dissociates upon heme binding; purified GAPDH-heme complex transfers heme to apo-sGCβ in vitro; heme delivery depends on cellular GAPDH expression levels and on GAPDH's ability to bind intracellular heme.","method":"Fluorescence quenching reporter (tetra-Cys sGCβ) in live cells; GAPDH knockdown/overexpression; GAPDH heme-binding mutant; Co-IP in cells; in vitro heme transfer with purified proteins","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro heme-transfer assay with purified proteins, live-cell reporter, Co-IP, and knockdown; multiple orthogonal methods in one study","pmids":["32358060"],"is_preprint":false},{"year":2020,"finding":"GAPDH and NAMPT form a stable nuclear complex required for nuclear translocation of NAMPT; this translocation sustains the stress-induced NMN/NAD+ salvage pathway in the nucleus upon H2O2, GSNO, or DNA-damage stimuli.","method":"Immunoprecipitation; pulldown; surface plasmon resonance; immunofluorescence; SAXS; MS-based complex analysis; cellular NAD+ rescue experiments","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — SPR quantitative binding, SAXS structural data, Co-IP, functional nuclear NAD+ rescue; multiple orthogonal methods","pmids":["31988240"],"is_preprint":false},{"year":2020,"finding":"Src kinase phosphorylates GAPDH at Tyr41 under DNA damage stress; this phosphorylation is essential for GAPDH nuclear translocation and its DNA repair function. Nuclear GAPDH associates with DNA polymerase β (Pol β), promotes Pol β polymerase activity, and enhances base excision repair (BER) efficiency.","method":"Kinase assay; Tyr41 phosphorylation-deficient GAPDH mutant; nuclear fractionation; Co-IP with Pol β; BER activity assay; GAPDH knockdown with DNA damage sensitivity measurement in cells and xenografts","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific phosphorylation with kinase assay, mutagenesis, Co-IP, and functional BER assay; single lab, multiple methods","pmids":["32539222"],"is_preprint":false},{"year":2021,"finding":"Hydrogen sulfide (H2S) sulfhydrates the active-site cysteine of GAPDH, causing its nuclear redistribution; nuclear GAPDH interacts with CCAR2/DBC1, disrupting the inhibitory CCAR2–SIRT1 complex; activated SIRT1 then deacetylates LC3B to trigger autophagy flux and restrict intracellular Mycobacterium tuberculosis.","method":"Sulfhydration assay; nuclear fractionation; Co-IP (GAPDH–CCAR2, CCAR2–SIRT1); active-site cysteine GAPDH mutant; GAPDH ablation cells; LC3B deacetylation assay; intracellular mycobacterial growth assay","journal":"Autophagy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical sulfhydration, Co-IP series, mutagenesis, and functional autophagy/pathogen readout; single lab, multiple orthogonal methods","pmids":["33459133"],"is_preprint":false},{"year":2021,"finding":"H2O2-induced S-glutathionylation of GAPDH promotes its nuclear translocation; nuclear GAPDH forms a complex with SIRT1 and trans-glutathionylates SIRT1, inhibiting SIRT1 deacetylase activity; inactivated SIRT1 stably binds acetylated p53, initiating caspase-3 cleavage and apoptosis. Glutaredoxin-1 (Glrx) reverses GAPDH S-glutathionylation and prevents nuclear translocation.","method":"Co-IP; GAPDH redox-dead mutant (C150S/C152S); nuclear fractionation; SIRT1 deacetylase assay; caspase-3 cleavage assay; Glrx overexpression; human primary endothelial cells","journal":"Free Radical Biology & Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, mutagenesis, enzymatic activity assay, and apoptosis readout; single lab, multiple orthogonal methods","pmids":["34332079"],"is_preprint":false},{"year":2018,"finding":"Amyloid-β1-42 exposure increases NO production leading to GAPDH S-nitrosylation (at Cys150); SNO-GAPDH activates p300 acetyltransferase, promotes SIRT1 nitrosylation/inactivation, and thereby increases tau acetylation at Lys280 and neurofibrillary tangle formation; GAPDH C150S mutant or the inhibitor CGP3466B abrogated Aβ-induced tau acetylation and cognitive impairment in mice.","method":"S-nitrosylation assays; p300 acetyltransferase assay; SIRT1 activity assay; tau acetylation MS; GAPDH C150S mutant; CGP3466B pharmacological inhibition; mouse behavioral tests; postmortem AD brain tissue","journal":"Science Signaling","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — site-directed mutagenesis, enzymatic assays, pharmacological rescue, in vivo mouse model, and human AD tissue; multiple orthogonal methods","pmids":["29559585"],"is_preprint":false},{"year":2022,"finding":"GAPDH (as heme chaperone) is involved in heme maturation of myoglobin and hemoglobins α, β, γ; GAPDH mutants H53A and K227A decrease heme content of these globins; GAPDH is found in complex with each globin and Hsp90 in cells; GAPDH knockdown in C2C12 myoblasts suppresses myoglobin heme maturation and in K562 erythroleukemia cells suppresses hemoglobin dimerization.","method":"GAPDH overexpression/knockdown; GAPDH mutant (H53A, K227A) rescue experiments; Co-IP (GAPDH-globin-Hsp90 complex); heme content measurement; differentiation models (C2C12, HiDEP-1, K562)","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis, Co-IP, knockdown with specific readout in multiple cell models; single lab","pmids":["34972240"],"is_preprint":false},{"year":2016,"finding":"δPKC phosphorylates GAPDH, decreasing GAPDH tetramerization and glycolytic activity; GAPDH oligomerization (tetramer formation) is required for its non-catalytic role in mitochondrial elimination under oxidative stress; a rationally designed pseudo-GAPDH (ψGAPDH) peptide inhibits δPKC-mediated GAPDH phosphorylation and GAPDH oligomerization, reducing mitochondrial elimination and increasing cardiac damage in a myocardial infarction model.","method":"δPKC kinase assay; GAPDH tetramerization assay; GAPDH glycolytic activity in vitro and ex vivo; mitochondrial elimination assay; cardiac ischemia-reperfusion injury animal model","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase and tetramerization assays, functional peptide inhibitor, in vivo animal model; single lab","pmids":["27129213"],"is_preprint":false},{"year":2023,"finding":"Cells expressing a GAPDH active-site cysteine redox-switch mutant (cannot be oxidized by H2O2) retain glycolytic activity but fail to stimulate the oxidative pentose phosphate pathway and enhance reductive capacity upon oxidative stress; this impairs anchorage-independent growth, spheroid formation, and in vivo tumor growth; fatty acid metabolism in kidney and heart is altered in mice lacking the GAPDH redox switch.","method":"GAPDH redox-switch knock-in mutant mice and cell lines; metabolic flux analysis; anchorage-independent growth assays; in vivo tumor models; chemo/radiotherapy combination experiments","journal":"Nature Metabolism","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic knock-in mutant in cells and in vivo mice, metabolic flux analysis, tumor models, and combinatorial stress experiments; single rigorous study with multiple orthogonal methods","pmids":["37024754"],"is_preprint":false},{"year":2021,"finding":"Quantitative knockdown/inhibition showed that glycolytic flux in cancer cells is unaffected until GAPDH activity falls below ~19% of normal; below this threshold, glycolysis decreases proportionally because substrate G3P accumulation can no longer thermodynamically compensate; GAPDH + PGK1 together operate near equilibrium and define the rate-controlling step.","method":"siRNA GAPDH knockdown; iodoacetate-dependent enzymatic inhibition; direct glycolysis rate measurement; G3P concentration measurement; thermodynamic analysis","journal":"The Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — quantitative enzyme inhibition and metabolite measurement; mechanistic thermodynamic model validated by experiment; single lab","pmids":["33545174"],"is_preprint":false},{"year":2023,"finding":"Inhibition of GAPDH in neutrophils blocks glycolysis and promotes pentose phosphate pathway activity, blunts the respiratory burst, increases intracellular pH, and is sufficient to cause neutrophil extracellular trap (NET) formation in a neutrophil-elastase-dependent manner; blocking the pH increase prevented NET formation and cell death, identifying GAPDH as an intrinsic suppressor of NET formation.","method":"GAPDH inhibition (pharmacological); metabolic flux assays; neutrophil extracellular trap assays; intracellular pH measurement; elastase inhibition; patient neutrophil metabolomics (COVID-19)","journal":"Nature Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological GAPDH inhibition with mechanistic pH and metabolic readouts; multiple functional assays; single lab","pmids":["37147288"],"is_preprint":false},{"year":2024,"finding":"Tissue transglutaminase 2 (TGM2) transfers serotonin (5-HT) to GAPDH at Gln262, catalyzing GAPDH serotonylation; this modification supports cytoplasmic localization of GAPDH, induces a glycolytic metabolic shift, and promotes antitumor activity of CD8+ T cells; monoamine oxidase A (MAOA) degrades 5-HT and acts as an intrinsic negative regulator; overexpression of TPH1 in CAR-T cells increased antitumor responses.","method":"TGM2-catalyzed serotonylation assay; Gln262 site identification by MS; GAPDH localization by fractionation; metabolic flux assays; CAR-T cell adoptive transfer in vivo","journal":"Molecular Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical serotonylation assay, MS site identification, cellular localization, metabolic assay, and in vivo CAR-T transfer; single lab, multiple methods","pmids":["38215751"],"is_preprint":false},{"year":2019,"finding":"Crystal structure of monomethyl fumarate (MMF)-bound human GAPDH at 2.29 Å resolution showed that MMF is covalently linked to the catalytic Cys152; the adduct blocks NAD+ co-substrate binding via steric hindrance of the nicotinamide moiety, explaining GAPDH inhibition by fumarate derivatives.","method":"X-ray crystallography at 2.29 Å; GAPDH enzyme activity assay; structural comparison with NAD+-bound GAPDH","journal":"Molecules and Cells","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with covalent modification at defined catalytic cysteine, combined with enzyme activity assay; mechanistically definitive structural explanation","pmids":["31387164"],"is_preprint":false},{"year":2014,"finding":"Cell-surface GAPDH on macrophages functions as a moonlighting receptor: under iron depletion it binds holotransferrin (and lactoferrin) for iron import; under iron excess, a different surface GAPDH isoform recruits apotransferrin in association with ferroportin to facilitate iron efflux; GAPDH knockdown abolishes these iron transport activities.","method":"Co-immunoprecipitation; immunofluorescence; surface GAPDH expression correlation with iron transport; GAPDH knockdown; in vivo rodent iron-overload model","journal":"Journal of Cell Science / Biochemistry and Cell Biology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP, knockdown with functional iron transport readout, in vivo model; single lab; replicated across multiple related papers from same group","pmids":["25074810","22292499"],"is_preprint":false},{"year":2012,"finding":"Cell-surface GAPDH on macrophages functions as a plasminogen receptor; upon inflammation, macrophages recruit GAPDH to their surface to capture plasminogen, enabling ECM proteolysis and macrophage migration; GAPDH knockdown and in vivo approaches confirmed this role.","method":"Biochemical binding assay; Co-immunoprecipitation; GAPDH knockdown; in vivo macrophage migration assay","journal":"FASEB Journal (2017 paper citing 2012 mechanism)","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — biochemical binding, knockdown with functional readout, in vivo model; single lab","pmids":["28298336"],"is_preprint":false},{"year":2023,"finding":"FBXW10 promotes GAPDH polyubiquitination and activation; VRK2-dependent phosphorylation of GAPDH at Ser151 is required for its ubiquitination and activation by FBXW10; activated GAPDH interacts with TRAF2, upregulating canonical and non-canonical NF-κB pathways and increasing PD-L1 and AR-VRK2 expression in hepatocellular carcinoma.","method":"Ubiquitination assay; phosphorylation mutagenesis (Ser151); Co-IP (GAPDH-TRAF2); NF-κB reporter assay; in vivo transgenic HCC mouse model; koningic acid (GAPDH inhibitor) treatment","journal":"Cell Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination/phosphorylation biochemistry, mutagenesis, Co-IP, NF-κB assay, in vivo mouse model; single lab, multiple methods","pmids":["37450367"],"is_preprint":false},{"year":2021,"finding":"Age-associated sarcopenia correlates with increased iNOS-dependent GAPDH S-nitrosylation at Cys150, Cys154, and Cys245; nuclear translocation of S-nitrosated GAPDH contributes to apoptosis in aged muscle; iNOS inhibition (1400W) or GAPDH S-nitrosation site mutation alleviated apoptosis of C2C12 cells.","method":"Quantitative S-nitrosation proteomics; iNOS inhibitor experiments; GAPDH S-nitrosation site mutagenesis; apoptosis assay; mouse aging model","journal":"Nitric Oxide: Biology and Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-specific quantitative proteomics, mutagenesis rescue, and in vivo aging model; single lab","pmids":["34973445"],"is_preprint":false},{"year":2009,"finding":"Extracellular GAPDH binds to immunoglobulin-like domains I–VI and fibronectin type III repeats 4–5 of the cell adhesion molecule L1; GAPDH-dependent phosphorylation of L1 (using ATP) promotes L1-mediated neurite outgrowth and L1-Fc bead aggregation, which are blocked by alkaline phosphatase or kinase inhibitor.","method":"Protein-protein binding assay (domain mapping); surface biotinylation; neurite outgrowth assay; GAPDH antibody inhibition; exogenous GAPDH addition; alkaline phosphatase and kinase inhibitor controls","journal":"Molecular and Cellular Neurosciences","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — domain-mapping pulldown, functional neurite outgrowth assay, and pharmacological controls; single lab","pmids":["19285135"],"is_preprint":false},{"year":2012,"finding":"CIB1 depletion in neuroblastoma and breast cancer cells promotes non-apoptotic cell death requiring nuclear GAPDH accumulation; CIB1 loss disrupts PI3K/AKT and Ras/MEK/ERK pathways; AKT inhibition alone maximally induces GAPDH nuclear accumulation, whereas concurrent ERK inhibition causes DNA damage response and cell death; MEK/ERK inhibition alone does not affect GAPDH localization.","method":"CIB1 siRNA knockdown; nuclear fractionation; pharmacological pathway inhibition (PI3K, AKT, MEK/ERK); cell death and DNA damage assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — genetic knockdown, pharmacological pathway dissection, and nuclear localization readout; single lab","pmids":["22964641"],"is_preprint":false},{"year":2023,"finding":"Acetate increases acetyl-CoA levels in CD4+ T cells, potentiating GAPDH acetylation, which in turn enhances GAPDH enzymatic activity, aerobic glycolysis, and Th1 cell polarization; reducing acetyl-CoA via fatty acid oxidation inhibition decreases acetyl-GAPDH levels.","method":"Transcriptome profiling; GAPDH acetylation measurement; GAPDH activity assay; glycolysis measurement; Th1 polarization assay; acetyl-CoA manipulation","journal":"Molecular Biology of the Cell","confidence":"Low","confidence_rationale":"Tier 3 / Weak — acetylation and activity assays described but single lab, no mutagenesis to identify site, no acetyltransferase identification","pmids":["37133968"],"is_preprint":false},{"year":2005,"finding":"Amyloid-β peptide exposure promotes nuclear accumulation of a disulfide-linked form of GAPDH, which becomes detergent-insoluble; disulfide bonding reduces GAPDH enzymatic activity; increased GAPDH disulfide bonding was observed in detergent-insoluble extracts from Alzheimer's disease patient and transgenic mouse brain tissue.","method":"Cell fractionation; GAPDH activity assay; immunofluorescence; Western blot for disulfide-bonded GAPDH in AD brain tissue and transgenic mice","journal":"FASEB Journal","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — enzymatic activity assay, cellular localization, and AD tissue/mouse model comparison; single lab","pmids":["16186172"],"is_preprint":false},{"year":2019,"finding":"GAPDH overexpression in T cells activates the non-canonical NF-κB pathway in transgenic mice, leading to development of a peripheral Tfh-like lymphoma recapitulating human angioimmunoblastic T cell lymphoma (AITL); NIK inhibition targeting NF-κB signaling prolonged survival of AITL-bearing mice.","method":"T cell-specific GAPDH transgenic mouse model; NF-κB pathway analysis; histology and immunophenotyping; NIK inhibitor treatment","journal":"Cancer Cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic mouse model with defined molecular pathway (non-canonical NF-κB) and pharmacological rescue; single lab","pmids":["31447347"],"is_preprint":false},{"year":2011,"finding":"GAPDH depletion in human lung carcinoma cells causes accelerated cellular senescence (proliferation arrest, morphology change, SA-β-galactosidase staining, upregulation of DEC1 and GLB1) via sustained AMPK activation through phosphorylation of its α subunit at Thr172, in the absence of DNA damage; this is dependent on compromised glycolysis and energy crisis, and occurs independently of LKB1.","method":"GAPDH siRNA knockdown; SA-β-galactosidase staining; AMPK Thr172 phosphorylation measurement; metabolic and genetic rescue experiments","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — knockdown with senescence phenotype and defined signaling node (AMPK); rescue experiments; single lab","pmids":["21749859"],"is_preprint":false},{"year":2015,"finding":"GAPDH interacts with apurinic/apyrimidinic (AP) sites in DNA by forming Schiff-base intermediates (borohydride-trappable); the interaction depends on GAPDH SH-groups (disulfide reduction abolishes adduct formation); GAPDH does not exhibit AP lyase activity despite forming adducts.","method":"NaBH4 crosslinking; mass spectrometry peptide mapping; AP site binding assay with purified GAPDH; thiol reduction experiments","journal":"Mutation Research","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — biochemical crosslinking with purified protein, MS identification, negative result (no AP lyase) explicitly confirmed; single lab","pmids":["26203648"],"is_preprint":false},{"year":2022,"finding":"GAPDH delivers heme to IDO1 and TDO via direct interaction; overexpression of GAPDH increased heme delivery to apo-IDO1 and apo-TDO in cells; Hsp90 interacted with apo-IDO1 but not apo-TDO and was required only for IDO1 heme insertion, not TDO.","method":"GAPDH overexpression/knockdown in cells; Co-IP (GAPDH-IDO1, GAPDH-TDO, Hsp90 interactions); IDO1/TDO heme content measurement; heme-deficient HEK293T cell system","journal":"Free Radical Biology & Medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, overexpression/knockdown with functional heme measurement, and in vitro interaction studies; single lab","pmids":["35051612"],"is_preprint":false}],"current_model":"GAPDH is a tetrameric glycolytic enzyme that catalyzes the oxidative phosphorylation of glyceraldehyde-3-phosphate via a conserved active-site cysteine (Cys152 in human); this cysteine acts as a versatile redox switch—subject to S-nitrosylation (by NO/iNOS/nNOS), S-glutathionylation (by H2O2), succination (by fumarate/DMF), alkylation (by itaconate), and reversible oxidation (by H2O2)—that inactivates glycolysis, re-routes carbon to the pentose phosphate pathway, and enables GAPDH to adopt multiple non-glycolytic functions including: (1) binding Siah1 and translocating to the nucleus where it is acetylated by p300/CBP (at Lys160), trans-nitrosylates nuclear proteins (SIRT1, HDAC2, DNA-PK), and activates p53-dependent apoptosis; (2) acting as a heme chaperone delivering mitochondrially-generated heme to apo-sGC, IDO1, TDO, myoglobin, and hemoglobins; (3) binding TERC to inhibit telomerase; (4) associating with NAMPT to enable its nuclear translocation for NAD+ salvage; (5) translocating to the nucleus to facilitate DNA base excision repair via DNA Pol β; (6) appearing on the cell surface to function as a transferrin/lactoferrin/plasminogen receptor for iron homeostasis; and (7) being post-translationally modified by CARM1 methylation (Arg234) and VRK2/FBXW10-dependent ubiquitination (Ser151) to regulate glycolysis and NF-κB signaling in cancer."},"narrative":{"mechanistic_narrative":"GAPDH is a tetrameric glycolytic enzyme whose active-site cysteine (Cys152 in human; Cys150/Cys152 in rodent and yeast orthologs) functions as a versatile redox switch that couples metabolic flux to a diverse repertoire of non-glycolytic, signaling functions [PMID:7573405, PMID:37024754]. Quantitatively, GAPDH together with PGK1 operates near equilibrium and defines a rate-controlling node of glycolysis: flux is buffered until GAPDH activity falls below ~19% of normal, after which glycolysis declines proportionally [PMID:33545174]. The catalytic cysteine is the convergence point for many covalent and oxidative modifications that inactivate the enzyme and re-route metabolism: reversible S-nitrosylation by NO/iNOS/nNOS [PMID:7573405, PMID:16574384, PMID:16633896], S-glutathionylation and reversible oxidation by H2O2 [PMID:34332079, PMID:37024754], H2S-dependent sulfhydration [PMID:33459133], succination by dimethyl/monomethyl fumarate (structurally shown to block NAD+ binding) [PMID:29599194, PMID:31387164], and alkylation at Cys22 by itaconate [PMID:31704924]; the enzyme is additionally regulated by CARM1 methylation at Arg234 [PMID:30232003], δPKC phosphorylation that disrupts tetramerization [PMID:27129213], VRK2/FBXW10-dependent phosphorylation/ubiquitination at Ser151 [PMID:37450367], and TGM2-catalyzed serotonylation at Gln262 [PMID:38215751]. These modifications loss of glycolytic activity divert carbon toward the oxidative pentose phosphate pathway and reductive metabolism under oxidative stress, a switch required for anchorage-independent and tumor growth [PMID:37024754]. Inactivation of GAPDH underlies the anti-inflammatory actions of fumarate and itaconate by suppressing glycolysis in immune cells [PMID:29599194, PMID:31704924] and the selective vulnerability of glycolytic KRAS/BRAF-mutant tumors to oxidative GAPDH inactivation [PMID:26541605]. Modification of the catalytic cysteine also drives nuclear translocation: S-nitrosylated GAPDH binds the E3 ligase Siah1 and is carried to the nucleus, where it is acetylated at Lys160 by p300/CBP, stimulates p300/CBP activity and p53-dependent apoptosis, and trans-modifies nuclear targets including SIRT1, HDAC2 and DNA-PK [PMID:16574384, PMID:16633896, PMID:18552833, PMID:20972425, PMID:24670206, PMID:34332079]; this axis drives neuronal death and Aβ-induced tau acetylation in Alzheimer models, and is restrained by the cytosolic anchor GOSPEL [PMID:19607794, PMID:29559585]. Beyond apoptosis, nuclear GAPDH supports base excision repair through DNA polymerase β following Src-mediated Tyr41 phosphorylation [PMID:32539222], partners with NAMPT to sustain nuclear NAD+ salvage [PMID:31988240], and binds the telomerase RNA TERC to inhibit telomerase [PMID:22847419]. GAPDH additionally moonlights as a heme chaperone delivering heme to apo-sGCβ1, IDO1, TDO, and globins in complex with Hsp90 [PMID:32358060, PMID:34972240, PMID:35051612], and as a cell-surface receptor for transferrin/lactoferrin (iron homeostasis) and plasminogen (macrophage migration) [PMID:25074810, PMID:22292499, PMID:28298336]. In cancer, GAPDH promotes NF-κB signaling via TRAF2 and drives a T-cell lymphoma phenotype when overexpressed [PMID:37450367, PMID:31447347].","teleology":[{"year":1995,"claim":"Established that nitric oxide directly and reversibly inhibits GAPDH by modifying its active-site cysteine, defining the foundational redox-switch chemistry rather than ADP-ribosylation.","evidence":"In vitro assays with purified GAPDH and endothelial cells, stoichiometric nitrosylation quantification, substrate-protection and thiol-reversal controls","pmids":["7573405"],"confidence":"High","gaps":["Did not connect cysteine nitrosylation to any downstream cellular function","No structural detail of the modified cysteine"]},{"year":2006,"claim":"Linked active-site S-nitrosylation to a cell-fate program by showing modified GAPDH binds Siah1 and translocates to the nucleus to trigger cytotoxicity, transforming GAPDH from a metabolic enzyme into an apoptotic signaling molecule.","evidence":"Co-IP, NOS inhibitor and binding-interference experiments, nuclear translocation assays, Cys150 mutagenesis","pmids":["16574384","16633896"],"confidence":"High","gaps":["Nuclear effector targets of the GAPDH-Siah1 complex not yet defined","Physiological versus pathological triggers not separated"]},{"year":2008,"claim":"Defined the nuclear effector mechanism of translocated GAPDH (p300/CBP acetylation at Lys160 driving p53 apoptosis) and identified GAPDH as a redox-sensing component of a stress MAPK phosphorelay in yeast, generalizing the moonlighting paradigm.","evidence":"Co-IP, acetyltransferase activity assays, K160R dominant-negative mutagenesis; yeast genetic epistasis with Cys152 oxidation monitoring","pmids":["18552833","18406331"],"confidence":"High","gaps":["Acetylation site mapping in vivo limited to single residue","Conservation of the yeast phosphorelay role in mammals not addressed"]},{"year":2009,"claim":"Identified GOSPEL as a cytosolic anchor competing with Siah1, establishing that nuclear translocation is actively regulated and providing a neuroprotective brake.","evidence":"Reciprocal Co-IP, competition binding, Cys47 mutagenesis, neuronal overexpression/knockdown, in vivo viral delivery","pmids":["19607794"],"confidence":"High","gaps":["Structural basis of GOSPEL-GAPDH-Siah1 competition unresolved","GOSPEL's broader functions unknown"]},{"year":2012,"claim":"Extended GAPDH moonlighting to telomere biology and extracellular receptor functions, showing TERC binding inhibits telomerase and surface GAPDH acts as a plasminogen receptor for macrophage migration.","evidence":"Co-IP, TRAP telomerase assay, domain-mapping mutagenesis, senescence assays; surface binding assays and macrophage migration in vivo","pmids":["22847419","28298336"],"confidence":"Medium","gaps":["Mechanism of GAPDH export to the cell surface unknown","TERC-binding interface mapped only to catalytic-domain lysine"]},{"year":2010,"claim":"Showed SNO-GAPDH transnitrosylates nuclear proteins (SIRT1, HDAC2, DNA-PK), providing a mechanism for delivering cytoplasmic NO signals to specific nuclear targets.","evidence":"In vitro transnitrosylation with purified proteins, cell-based Co-IP and translocation, Cys150 mutagenesis","pmids":["20972425"],"confidence":"High","gaps":["Selectivity determinants for nuclear target choice unclear","Quantitative contribution versus direct NO nitrosylation not assessed"]},{"year":2014,"claim":"Resolved the apoptotic effector mechanism (GAPDH-p53 complex enhancing p53 expression/phosphorylation) and characterized GAPDH-AP-site Schiff-base adducts and iron-transport receptor activity, expanding the moonlighting catalog.","evidence":"Co-IP and interfering-peptide disruption with in vivo stroke model; NaBH4 crosslinking and MS; surface GAPDH iron-transport Co-IP and knockdown","pmids":["24670206","26203648","25074810","22292499"],"confidence":"Medium","gaps":["GAPDH lacks AP lyase activity, so the functional role of AP-site adducts is undefined","Surface GAPDH iron-handling isoform differences not molecularly defined"]},{"year":2015,"claim":"Demonstrated that oxidative GAPDH inactivation is therapeutically exploitable, with high-dose vitamin C selectively killing glycolytic KRAS/BRAF-mutant colorectal cancer via ROS-mediated GAPDH inhibition.","evidence":"Cell viability and GAPDH activity assays, ROS/glutathione quantification, genetic mutant comparison, Apc/KrasG12D mouse model","pmids":["26541605"],"confidence":"High","gaps":["Whether GAPDH is the sole oxidative-stress target driving death not fully isolated","Modification chemistry on the cysteine not site-mapped in this study"]},{"year":2018,"claim":"Established immunometabolic and oncogenic control of GAPDH activity through covalent succination (DMF) and arginine methylation (CARM1), and linked SNO-GAPDH/p300/SIRT1 signaling to tau acetylation in Alzheimer pathology.","evidence":"MS-confirmed Cys152 succination with flux analysis and in vivo immune readouts; in vitro methyltransferase and R234 mutant rescue with HCC samples; C150S mutant and CGP3466B rescue in Aβ mouse model and AD tissue","pmids":["29599194","30232003","29559585"],"confidence":"High","gaps":["Interplay between competing modifications on the same enzyme not resolved","Relative contribution of glycolytic loss versus moonlighting effects in disease unclear"]},{"year":2019,"claim":"Provided the structural explanation for fumarate-derivative inhibition and added itaconate alkylation at Cys22 as an anti-inflammatory mechanism, while linking GAPDH overexpression to NF-κB-driven T-cell lymphoma.","evidence":"2.29 Å crystal structure of MMF-Cys152 adduct with activity assay; 4-OI alkylation, U13C tracing and C22A rescue; T-cell GAPDH transgenic mouse with NIK inhibition","pmids":["31387164","31704924","31447347"],"confidence":"High","gaps":["Cys22 is distinct from the catalytic Cys152, so distinct functional consequences need separation","Mechanism connecting GAPDH levels to non-canonical NF-κB not molecularly defined here"]},{"year":2020,"claim":"Defined GAPDH as a heme chaperone delivering heme to apo-sGCβ1 and as a nuclear partner of NAMPT for NAD+ salvage and DNA polymerase β for base excision repair, establishing chaperone and genome-maintenance moonlighting roles with defined regulatory inputs.","evidence":"In vitro heme transfer with purified proteins and live-cell reporter; SPR/SAXS/Co-IP for NAMPT complex; Src kinase assay and Tyr41 mutant with Pol β Co-IP and BER assay","pmids":["32358060","31988240","32539222"],"confidence":"High","gaps":["Source and trafficking of GAPDH-bound heme within cells incompletely defined","How a single enzyme partitions among heme, NAD+ and BER roles is unknown"]},{"year":2021,"claim":"Quantified GAPDH's rate-controlling threshold in glycolysis and connected additional redox modifications (H2S sulfhydration, glutathionylation) and modification crosstalk to nuclear translocation, apoptosis, autophagy and aging phenotypes.","evidence":"siRNA/iodoacetate titration with metabolite and thermodynamic analysis; sulfhydration and glutathionylation Co-IP series with mutants and functional readouts; S-nitrosation proteomics in aged muscle","pmids":["33545174","33459133","34332079","34973445"],"confidence":"Medium","gaps":["Whether distinct cysteine modifications produce identical or distinct nuclear outcomes is unresolved","Single-lab studies for several signaling axes lack reciprocal cross-validation"]},{"year":2023,"claim":"Established with a genetic knock-in that the GAPDH redox switch itself is required to route carbon to the oxidative PPP and support tumor growth, and identified serotonylation, acetate-driven acetylation, and VRK2/FBXW10/TRAF2 axes as activity-tuning inputs across immunity and cancer.","evidence":"Redox-switch knock-in mice/cells with flux analysis and tumor models; TGM2 serotonylation at Gln262 with CAR-T transfer; neutrophil NET assays; ubiquitination/phosphorylation biochemistry and NF-κB reporter with HCC mouse model","pmids":["37024754","38215751","37147288","37450367"],"confidence":"Medium","gaps":["Integration of the many activity-tuning modifications into a unified regulatory logic is lacking","Acetylation site and acetyltransferase for the activating acetylation not identified [#31]"]},{"year":null,"claim":"How a single enzyme integrates competing cysteine and non-cysteine modifications to select among glycolytic, apoptotic, heme-chaperone, DNA-repair, and receptor functions, and what governs its localization to nucleus, cell surface, and extracellular space, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model of modification crosstalk and functional partitioning","Trafficking machinery for surface/extracellular GAPDH unknown","Structural basis for most moonlighting partner interactions undetermined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,7,21,24]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[5,29]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[12,18,36]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[10]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[35]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[25,26]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0,3,20]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,21,23]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,2,5,11,13,14,16]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[25,26,29]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[29]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,7,9,20,21]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,2,11,16,28]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,3,16,20]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[14,35]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[7,9,22,23,33]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,27,33]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[13]}],"complexes":[],"partners":["SIAH1","GOSPEL","EP300","SIRT1","NAMPT","TERC","POLB","TRAF2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04406","full_name":"Glyceraldehyde-3-phosphate dehydrogenase","aliases":["Peptidyl-cysteine S-nitrosylase GAPDH"],"length_aa":335,"mass_kda":36.1,"function":"Catalyzes the conversion of D-glyceraldehyde 3-phosphate (G3P) into 3-phospho-D-glyceroyl phosphate in glycolysis and the reverse reaction in gluconeogenesis (PubMed:11724794, PubMed:3170585). Also shows nitrosylase activity, thereby playing a role in nuclear functions (PubMed:11724794, PubMed:3170585). Modulates the organization and assembly of the cytoskeleton (By similarity). Facilitates the CHP1-dependent microtubule and membrane associations through its ability to stimulate the binding of CHP1 to microtubules (By similarity). Component of the GAIT (gamma interferon-activated inhibitor of translation) complex which mediates interferon-gamma-induced transcript-selective translation inhibition in inflammation processes (PubMed:23071094). Upon interferon-gamma treatment assembles into the GAIT complex which binds to stem loop-containing GAIT elements in the 3'-UTR of diverse inflammatory mRNAs (such as ceruplasmin) and suppresses their translation (PubMed:23071094). Also plays a role in innate immunity by promoting TNF-induced NF-kappa-B activation and type I interferon production, via interaction with TRAF2 and TRAF3, respectively (PubMed:23332158, PubMed:27387501). Participates in nuclear events including transcription, RNA transport, DNA replication and apoptosis (By similarity). Nuclear functions are probably due to the nitrosylase activity that mediates cysteine S-nitrosylation of nuclear target proteins such as SIRT1, HDAC2 and PRKDC (By similarity)","subcellular_location":"Cytoplasm, cytosol; Nucleus; Cytoplasm, perinuclear region; Membrane; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/P04406/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/GAPDH","classification":"Common Essential","n_dependent_lines":1199,"n_total_lines":1208,"dependency_fraction":0.9925496688741722},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000111640","cell_line_id":"CID000952","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"nucleoplasm","grade":2}],"interactors":[{"gene":"ACTR2","stoichiometry":0.2},{"gene":"AKAP12","stoichiometry":0.2},{"gene":"ASS1","stoichiometry":0.2},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"ESD","stoichiometry":0.2},{"gene":"ANKRD10","stoichiometry":0.2},{"gene":"ERLIN2","stoichiometry":0.2},{"gene":"MKNK2","stoichiometry":0.2},{"gene":"INTS9","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000952","total_profiled":1310},"omim":[{"mim_id":"619225","title":"RIBOSOMAL PROTEIN L13A; RPL13A","url":"https://www.omim.org/entry/619225"},{"mim_id":"616689","title":"DEHYDRATED HEREDITARY STOMATOCYTOSIS 2; DHS2","url":"https://www.omim.org/entry/616689"},{"mim_id":"614232","title":"11-@BETA-HYDROXYSTEROID DEHYDROGENASE, TYPE II; HSD11B2","url":"https://www.omim.org/entry/614232"},{"mim_id":"614092","title":"RAB-INTERACTING LYSOSOMAL PROTEIN-LIKE 1; RILPL1","url":"https://www.omim.org/entry/614092"},{"mim_id":"613004","title":"HUNTINGTIN; HTT","url":"https://www.omim.org/entry/613004"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Plasma membrane","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Enhanced"},{"location":"Nuclear membrane","reliability":"Additional"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":25843.3},{"tissue":"tongue","ntpm":17635.1}],"url":"https://www.proteinatlas.org/search/GAPDH"},"hgnc":{"alias_symbol":[],"prev_symbol":["GAPD"]},"alphafold":{"accession":"P04406","domains":[{"cath_id":"3.40.50.720","chopping":"4-128","consensus_level":"high","plddt":98.2678,"start":4,"end":128},{"cath_id":"3.30.360.10","chopping":"151-316","consensus_level":"high","plddt":98.4266,"start":151,"end":316}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P04406","model_url":"https://alphafold.ebi.ac.uk/files/AF-P04406-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P04406-F1-predicted_aligned_error_v6.png","plddt_mean":98.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GAPDH","jax_strain_url":"https://www.jax.org/strain/search?query=GAPDH"},"sequence":{"accession":"P04406","fasta_url":"https://rest.uniprot.org/uniprotkb/P04406.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P04406/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P04406"}},"corpus_meta":[{"pmid":"26541605","id":"PMC_26541605","title":"Vitamin 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and endothelial cells; substrate-protection experiments; thiol-reversal assays; quantitative nitrosylation measurement\",\n      \"journal\": \"The American Journal of Physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified enzyme, stoichiometric quantification, substrate-protection controls, and reversal by thiols; mechanistically definitive\",\n      \"pmids\": [\"7573405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Diverse apoptotic stimuli activate iNOS/nNOS, leading to S-nitrosylation of GAPDH at Cys150 (rat), which abrogates catalytic activity and enables GAPDH to bind the E3-ubiquitin-ligase Siah1; the GAPDH–Siah1 complex translocates to the nucleus via Siah1's nuclear localization signal, where it stabilizes Siah1 and triggers cytotoxicity.\",\n      \"method\": \"Co-immunoprecipitation; NOS inhibitor and GAPDH-Siah binding interference experiments; nuclear translocation assays; apoptosis readouts\",\n      \"journal\": \"Biochimica et Biophysica Acta / Cellular and Molecular Neurobiology (review of original work)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across multiple labs; reciprocal co-IP; functional interference (blocking GAPDH-Siah binding prevents death); site-directed mutagenesis at Cys150\",\n      \"pmids\": [\"16574384\", \"16633896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Nuclear GAPDH (translocated after S-nitrosylation) is acetylated at Lys160 by the acetyltransferase p300/CBP via direct protein interaction; this in turn stimulates p300/CBP catalytic activity, activating downstream targets including p53 to cause apoptosis. A K160R dominant-negative GAPDH mutant blocks p300/CBP activation and reduces cell death.\",\n      \"method\": \"Co-immunoprecipitation; acetyltransferase activity assays; dominant-negative GAPDH K160R mutagenesis; apoptosis gene expression and cell-death quantification\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct protein interaction by Co-IP, enzymatic activity assay of p300/CBP, mutagenesis (K160R), and apoptosis readout in single rigorous study\",\n      \"pmids\": [\"18552833\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In fission yeast, the GAPDH isoform Tdh1 physically associates with the Mcs4 response regulator and stress-responsive MAPKKKs; H2O2 stress transiently oxidizes Cys152 of Tdh1, enhancing its association with Mcs4 and enabling phosphorelay signaling to the MAP kinase cascade, placing GAPDH as an essential redox-sensing component of the peroxide-stress phosphorelay.\",\n      \"method\": \"Co-immunoprecipitation; genetic epistasis (Tdh1 deletion abolishes Mpr1-Mcs4 interaction and phosphorelay); Cys152 oxidation monitoring\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, genetic epistasis (deletion phenotype), and redox-cysteine modification measured; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"18406331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A cytosolic 52 kDa protein named GOSPEL physiologically binds GAPDH, competing with Siah1 for GAPDH binding and thereby retaining GAPDH in the cytosol and preventing nuclear translocation. S-nitrosylation of GOSPEL at Cys47 enhances GAPDH–GOSPEL binding and its neuroprotective effect; GOSPEL overexpression protects neurons from NMDA excitotoxicity while its depletion enhances death.\",\n      \"method\": \"Co-immunoprecipitation; competition binding assays (GOSPEL vs. Siah1 for GAPDH); GOSPEL overexpression and knockdown in primary neuron cultures; in vivo viral delivery in mice; S-nitrosylation site mutagenesis (C47)\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, competition binding, mutagenesis (C47), in vivo neuronal protection; multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"19607794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"S-nitrosylated GAPDH (SNO-GAPDH) translocates to the nucleus and transnitrosylates nuclear proteins including SIRT1, HDAC2, and DNA-PK, providing a mechanism for targeted nitrosylation of nuclear proteins by cytoplasmic NO sources.\",\n      \"method\": \"Co-immunoprecipitation; transnitrosylation assays with purified SNO-GAPDH and nuclear protein targets; cell-based nuclear translocation; site-directed mutagenesis at Cys150\",\n      \"journal\": \"Nature Cell Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro transnitrosylation with purified proteins plus cell-based Co-IP; independent replication of the SNO-GAPDH nuclear translocation mechanism\",\n      \"pmids\": [\"20972425\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"High-dose vitamin C (as dehydroascorbate, DHA) is taken up by GLUT1, reduced intracellularly to vitamin C while depleting glutathione, causing ROS accumulation that inactivates GAPDH; this inhibition of GAPDH in highly glycolytic KRAS- or BRAF-mutant colorectal cancer cells causes an energetic crisis and selective cell death.\",\n      \"method\": \"Cellular viability assays; GAPDH activity measurement after DHA treatment; ROS and glutathione quantification; KRAS/BRAF mutant vs. wild-type comparison; in vivo Apc/KrasG12D mouse model\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple cell lines, genetic mutant comparisons, enzymatic activity assay, in vivo tumor model; replicated across multiple experimental systems in one study\",\n      \"pmids\": [\"26541605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dimethyl fumarate (DMF) succinates and covalently inactivates the catalytic cysteine (Cys152) of GAPDH both in vitro and in vivo in mice and humans; this inhibition down-regulates aerobic glycolysis in activated myeloid and lymphoid cells and mediates DMF's anti-inflammatory effects.\",\n      \"method\": \"In vitro GAPDH enzyme activity assay; mass spectrometry identification of succination at Cys152; cell metabolic flux analysis; in vivo mouse experiments; immune cell functional readouts\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic assay, MS-confirmed covalent modification site, in vivo validation, replicated in both mouse and human cells\",\n      \"pmids\": [\"29599194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CARM1 (PRMT4) methylates GAPDH at Arg234, inhibiting its catalytic activity; glucose starvation upregulates CARM1, leading to hypermethylation and GAPDH inhibition. Re-expression of wild-type but not methylation-mimetic GAPDH restores glycolytic levels, and R234 hypomethylation is found in hepatocellular carcinoma relative to normal tissue.\",\n      \"method\": \"In vitro methyltransferase assay; GAPDH activity assay; R234 methylation-mimetic mutant rescue experiments; in vitro and in vivo tumor proliferation; clinical HCC sample analysis by MS\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro methylation assay, mutagenesis rescue, in vivo tumor model, and clinical sample validation; multiple orthogonal methods\",\n      \"pmids\": [\"30232003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"4-Octyl itaconate (4-OI) directly alkylates Cys22 of GAPDH, reducing its enzymatic activity; U13C glucose tracing confirmed blockade of glycolytic flux at GAPDH; anti-inflammatory effects of 4-OI in macrophages are abrogated by overexpression of C22A mutant GAPDH but rescued by wild-type GAPDH.\",\n      \"method\": \"In vitro GAPDH alkylation and activity assay; isotope-tracing metabolic flux analysis (U13C glucose); C22A GAPDH mutagenesis rescue; LPS-lethality in vivo model\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct covalent modification at defined cysteine confirmed biochemically, isotope tracing, site-directed mutagenesis rescue, and in vivo validation\",\n      \"pmids\": [\"31704924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GAPDH interacts with the telomerase RNA component (TERC) via its NAD+-binding Rossmann fold, inhibits telomerase activity, and induces telomere shortening and breast cancer cell senescence; a lysine residue in the catalytic domain is required for this inhibition; substrate G3P and the NO donor GSNO negatively regulate GAPDH inhibition of telomerase.\",\n      \"method\": \"Co-immunoprecipitation; telomerase activity assay (TRAP); domain-mapping mutagenesis; telomere length measurement; cellular senescence assay\",\n      \"journal\": \"PNAS\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, enzymatic assay, domain mutagenesis; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"22847419\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Nuclear GAPDH (translocated via Siah1-dependent mechanism upon glutamate stimulation) forms a protein complex with p53, enhancing p53 expression and phosphorylation; disruption of GAPDH–p53 interaction by a peptide blocks glutamate-induced cell death and protects against ischemia-induced neuronal death in vivo in rats.\",\n      \"method\": \"Co-immunoprecipitation; interfering peptide disruption; p53 expression and phosphorylation assays; in vivo rat tMCAo stroke model\",\n      \"journal\": \"Molecular Brain\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, peptide interference with defined molecular readout, in vivo model; single lab\",\n      \"pmids\": [\"24670206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GAPDH functions as a heme chaperone that delivers heme to apo-soluble guanylyl cyclase β1 (apo-sGCβ): apo-sGCβ associates with GAPDH in cells and dissociates upon heme binding; purified GAPDH-heme complex transfers heme to apo-sGCβ in vitro; heme delivery depends on cellular GAPDH expression levels and on GAPDH's ability to bind intracellular heme.\",\n      \"method\": \"Fluorescence quenching reporter (tetra-Cys sGCβ) in live cells; GAPDH knockdown/overexpression; GAPDH heme-binding mutant; Co-IP in cells; in vitro heme transfer with purified proteins\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro heme-transfer assay with purified proteins, live-cell reporter, Co-IP, and knockdown; multiple orthogonal methods in one study\",\n      \"pmids\": [\"32358060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GAPDH and NAMPT form a stable nuclear complex required for nuclear translocation of NAMPT; this translocation sustains the stress-induced NMN/NAD+ salvage pathway in the nucleus upon H2O2, GSNO, or DNA-damage stimuli.\",\n      \"method\": \"Immunoprecipitation; pulldown; surface plasmon resonance; immunofluorescence; SAXS; MS-based complex analysis; cellular NAD+ rescue experiments\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — SPR quantitative binding, SAXS structural data, Co-IP, functional nuclear NAD+ rescue; multiple orthogonal methods\",\n      \"pmids\": [\"31988240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Src kinase phosphorylates GAPDH at Tyr41 under DNA damage stress; this phosphorylation is essential for GAPDH nuclear translocation and its DNA repair function. Nuclear GAPDH associates with DNA polymerase β (Pol β), promotes Pol β polymerase activity, and enhances base excision repair (BER) efficiency.\",\n      \"method\": \"Kinase assay; Tyr41 phosphorylation-deficient GAPDH mutant; nuclear fractionation; Co-IP with Pol β; BER activity assay; GAPDH knockdown with DNA damage sensitivity measurement in cells and xenografts\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific phosphorylation with kinase assay, mutagenesis, Co-IP, and functional BER assay; single lab, multiple methods\",\n      \"pmids\": [\"32539222\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Hydrogen sulfide (H2S) sulfhydrates the active-site cysteine of GAPDH, causing its nuclear redistribution; nuclear GAPDH interacts with CCAR2/DBC1, disrupting the inhibitory CCAR2–SIRT1 complex; activated SIRT1 then deacetylates LC3B to trigger autophagy flux and restrict intracellular Mycobacterium tuberculosis.\",\n      \"method\": \"Sulfhydration assay; nuclear fractionation; Co-IP (GAPDH–CCAR2, CCAR2–SIRT1); active-site cysteine GAPDH mutant; GAPDH ablation cells; LC3B deacetylation assay; intracellular mycobacterial growth assay\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical sulfhydration, Co-IP series, mutagenesis, and functional autophagy/pathogen readout; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"33459133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"H2O2-induced S-glutathionylation of GAPDH promotes its nuclear translocation; nuclear GAPDH forms a complex with SIRT1 and trans-glutathionylates SIRT1, inhibiting SIRT1 deacetylase activity; inactivated SIRT1 stably binds acetylated p53, initiating caspase-3 cleavage and apoptosis. Glutaredoxin-1 (Glrx) reverses GAPDH S-glutathionylation and prevents nuclear translocation.\",\n      \"method\": \"Co-IP; GAPDH redox-dead mutant (C150S/C152S); nuclear fractionation; SIRT1 deacetylase assay; caspase-3 cleavage assay; Glrx overexpression; human primary endothelial cells\",\n      \"journal\": \"Free Radical Biology & Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, mutagenesis, enzymatic activity assay, and apoptosis readout; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"34332079\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Amyloid-β1-42 exposure increases NO production leading to GAPDH S-nitrosylation (at Cys150); SNO-GAPDH activates p300 acetyltransferase, promotes SIRT1 nitrosylation/inactivation, and thereby increases tau acetylation at Lys280 and neurofibrillary tangle formation; GAPDH C150S mutant or the inhibitor CGP3466B abrogated Aβ-induced tau acetylation and cognitive impairment in mice.\",\n      \"method\": \"S-nitrosylation assays; p300 acetyltransferase assay; SIRT1 activity assay; tau acetylation MS; GAPDH C150S mutant; CGP3466B pharmacological inhibition; mouse behavioral tests; postmortem AD brain tissue\",\n      \"journal\": \"Science Signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — site-directed mutagenesis, enzymatic assays, pharmacological rescue, in vivo mouse model, and human AD tissue; multiple orthogonal methods\",\n      \"pmids\": [\"29559585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GAPDH (as heme chaperone) is involved in heme maturation of myoglobin and hemoglobins α, β, γ; GAPDH mutants H53A and K227A decrease heme content of these globins; GAPDH is found in complex with each globin and Hsp90 in cells; GAPDH knockdown in C2C12 myoblasts suppresses myoglobin heme maturation and in K562 erythroleukemia cells suppresses hemoglobin dimerization.\",\n      \"method\": \"GAPDH overexpression/knockdown; GAPDH mutant (H53A, K227A) rescue experiments; Co-IP (GAPDH-globin-Hsp90 complex); heme content measurement; differentiation models (C2C12, HiDEP-1, K562)\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis, Co-IP, knockdown with specific readout in multiple cell models; single lab\",\n      \"pmids\": [\"34972240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"δPKC phosphorylates GAPDH, decreasing GAPDH tetramerization and glycolytic activity; GAPDH oligomerization (tetramer formation) is required for its non-catalytic role in mitochondrial elimination under oxidative stress; a rationally designed pseudo-GAPDH (ψGAPDH) peptide inhibits δPKC-mediated GAPDH phosphorylation and GAPDH oligomerization, reducing mitochondrial elimination and increasing cardiac damage in a myocardial infarction model.\",\n      \"method\": \"δPKC kinase assay; GAPDH tetramerization assay; GAPDH glycolytic activity in vitro and ex vivo; mitochondrial elimination assay; cardiac ischemia-reperfusion injury animal model\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase and tetramerization assays, functional peptide inhibitor, in vivo animal model; single lab\",\n      \"pmids\": [\"27129213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cells expressing a GAPDH active-site cysteine redox-switch mutant (cannot be oxidized by H2O2) retain glycolytic activity but fail to stimulate the oxidative pentose phosphate pathway and enhance reductive capacity upon oxidative stress; this impairs anchorage-independent growth, spheroid formation, and in vivo tumor growth; fatty acid metabolism in kidney and heart is altered in mice lacking the GAPDH redox switch.\",\n      \"method\": \"GAPDH redox-switch knock-in mutant mice and cell lines; metabolic flux analysis; anchorage-independent growth assays; in vivo tumor models; chemo/radiotherapy combination experiments\",\n      \"journal\": \"Nature Metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic knock-in mutant in cells and in vivo mice, metabolic flux analysis, tumor models, and combinatorial stress experiments; single rigorous study with multiple orthogonal methods\",\n      \"pmids\": [\"37024754\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Quantitative knockdown/inhibition showed that glycolytic flux in cancer cells is unaffected until GAPDH activity falls below ~19% of normal; below this threshold, glycolysis decreases proportionally because substrate G3P accumulation can no longer thermodynamically compensate; GAPDH + PGK1 together operate near equilibrium and define the rate-controlling step.\",\n      \"method\": \"siRNA GAPDH knockdown; iodoacetate-dependent enzymatic inhibition; direct glycolysis rate measurement; G3P concentration measurement; thermodynamic analysis\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — quantitative enzyme inhibition and metabolite measurement; mechanistic thermodynamic model validated by experiment; single lab\",\n      \"pmids\": [\"33545174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Inhibition of GAPDH in neutrophils blocks glycolysis and promotes pentose phosphate pathway activity, blunts the respiratory burst, increases intracellular pH, and is sufficient to cause neutrophil extracellular trap (NET) formation in a neutrophil-elastase-dependent manner; blocking the pH increase prevented NET formation and cell death, identifying GAPDH as an intrinsic suppressor of NET formation.\",\n      \"method\": \"GAPDH inhibition (pharmacological); metabolic flux assays; neutrophil extracellular trap assays; intracellular pH measurement; elastase inhibition; patient neutrophil metabolomics (COVID-19)\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological GAPDH inhibition with mechanistic pH and metabolic readouts; multiple functional assays; single lab\",\n      \"pmids\": [\"37147288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Tissue transglutaminase 2 (TGM2) transfers serotonin (5-HT) to GAPDH at Gln262, catalyzing GAPDH serotonylation; this modification supports cytoplasmic localization of GAPDH, induces a glycolytic metabolic shift, and promotes antitumor activity of CD8+ T cells; monoamine oxidase A (MAOA) degrades 5-HT and acts as an intrinsic negative regulator; overexpression of TPH1 in CAR-T cells increased antitumor responses.\",\n      \"method\": \"TGM2-catalyzed serotonylation assay; Gln262 site identification by MS; GAPDH localization by fractionation; metabolic flux assays; CAR-T cell adoptive transfer in vivo\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical serotonylation assay, MS site identification, cellular localization, metabolic assay, and in vivo CAR-T transfer; single lab, multiple methods\",\n      \"pmids\": [\"38215751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Crystal structure of monomethyl fumarate (MMF)-bound human GAPDH at 2.29 Å resolution showed that MMF is covalently linked to the catalytic Cys152; the adduct blocks NAD+ co-substrate binding via steric hindrance of the nicotinamide moiety, explaining GAPDH inhibition by fumarate derivatives.\",\n      \"method\": \"X-ray crystallography at 2.29 Å; GAPDH enzyme activity assay; structural comparison with NAD+-bound GAPDH\",\n      \"journal\": \"Molecules and Cells\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with covalent modification at defined catalytic cysteine, combined with enzyme activity assay; mechanistically definitive structural explanation\",\n      \"pmids\": [\"31387164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cell-surface GAPDH on macrophages functions as a moonlighting receptor: under iron depletion it binds holotransferrin (and lactoferrin) for iron import; under iron excess, a different surface GAPDH isoform recruits apotransferrin in association with ferroportin to facilitate iron efflux; GAPDH knockdown abolishes these iron transport activities.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; surface GAPDH expression correlation with iron transport; GAPDH knockdown; in vivo rodent iron-overload model\",\n      \"journal\": \"Journal of Cell Science / Biochemistry and Cell Biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP, knockdown with functional iron transport readout, in vivo model; single lab; replicated across multiple related papers from same group\",\n      \"pmids\": [\"25074810\", \"22292499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cell-surface GAPDH on macrophages functions as a plasminogen receptor; upon inflammation, macrophages recruit GAPDH to their surface to capture plasminogen, enabling ECM proteolysis and macrophage migration; GAPDH knockdown and in vivo approaches confirmed this role.\",\n      \"method\": \"Biochemical binding assay; Co-immunoprecipitation; GAPDH knockdown; in vivo macrophage migration assay\",\n      \"journal\": \"FASEB Journal (2017 paper citing 2012 mechanism)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — biochemical binding, knockdown with functional readout, in vivo model; single lab\",\n      \"pmids\": [\"28298336\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FBXW10 promotes GAPDH polyubiquitination and activation; VRK2-dependent phosphorylation of GAPDH at Ser151 is required for its ubiquitination and activation by FBXW10; activated GAPDH interacts with TRAF2, upregulating canonical and non-canonical NF-κB pathways and increasing PD-L1 and AR-VRK2 expression in hepatocellular carcinoma.\",\n      \"method\": \"Ubiquitination assay; phosphorylation mutagenesis (Ser151); Co-IP (GAPDH-TRAF2); NF-κB reporter assay; in vivo transgenic HCC mouse model; koningic acid (GAPDH inhibitor) treatment\",\n      \"journal\": \"Cell Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination/phosphorylation biochemistry, mutagenesis, Co-IP, NF-κB assay, in vivo mouse model; single lab, multiple methods\",\n      \"pmids\": [\"37450367\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Age-associated sarcopenia correlates with increased iNOS-dependent GAPDH S-nitrosylation at Cys150, Cys154, and Cys245; nuclear translocation of S-nitrosated GAPDH contributes to apoptosis in aged muscle; iNOS inhibition (1400W) or GAPDH S-nitrosation site mutation alleviated apoptosis of C2C12 cells.\",\n      \"method\": \"Quantitative S-nitrosation proteomics; iNOS inhibitor experiments; GAPDH S-nitrosation site mutagenesis; apoptosis assay; mouse aging model\",\n      \"journal\": \"Nitric Oxide: Biology and Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-specific quantitative proteomics, mutagenesis rescue, and in vivo aging model; single lab\",\n      \"pmids\": [\"34973445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Extracellular GAPDH binds to immunoglobulin-like domains I–VI and fibronectin type III repeats 4–5 of the cell adhesion molecule L1; GAPDH-dependent phosphorylation of L1 (using ATP) promotes L1-mediated neurite outgrowth and L1-Fc bead aggregation, which are blocked by alkaline phosphatase or kinase inhibitor.\",\n      \"method\": \"Protein-protein binding assay (domain mapping); surface biotinylation; neurite outgrowth assay; GAPDH antibody inhibition; exogenous GAPDH addition; alkaline phosphatase and kinase inhibitor controls\",\n      \"journal\": \"Molecular and Cellular Neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — domain-mapping pulldown, functional neurite outgrowth assay, and pharmacological controls; single lab\",\n      \"pmids\": [\"19285135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CIB1 depletion in neuroblastoma and breast cancer cells promotes non-apoptotic cell death requiring nuclear GAPDH accumulation; CIB1 loss disrupts PI3K/AKT and Ras/MEK/ERK pathways; AKT inhibition alone maximally induces GAPDH nuclear accumulation, whereas concurrent ERK inhibition causes DNA damage response and cell death; MEK/ERK inhibition alone does not affect GAPDH localization.\",\n      \"method\": \"CIB1 siRNA knockdown; nuclear fractionation; pharmacological pathway inhibition (PI3K, AKT, MEK/ERK); cell death and DNA damage assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — genetic knockdown, pharmacological pathway dissection, and nuclear localization readout; single lab\",\n      \"pmids\": [\"22964641\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Acetate increases acetyl-CoA levels in CD4+ T cells, potentiating GAPDH acetylation, which in turn enhances GAPDH enzymatic activity, aerobic glycolysis, and Th1 cell polarization; reducing acetyl-CoA via fatty acid oxidation inhibition decreases acetyl-GAPDH levels.\",\n      \"method\": \"Transcriptome profiling; GAPDH acetylation measurement; GAPDH activity assay; glycolysis measurement; Th1 polarization assay; acetyl-CoA manipulation\",\n      \"journal\": \"Molecular Biology of the Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — acetylation and activity assays described but single lab, no mutagenesis to identify site, no acetyltransferase identification\",\n      \"pmids\": [\"37133968\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Amyloid-β peptide exposure promotes nuclear accumulation of a disulfide-linked form of GAPDH, which becomes detergent-insoluble; disulfide bonding reduces GAPDH enzymatic activity; increased GAPDH disulfide bonding was observed in detergent-insoluble extracts from Alzheimer's disease patient and transgenic mouse brain tissue.\",\n      \"method\": \"Cell fractionation; GAPDH activity assay; immunofluorescence; Western blot for disulfide-bonded GAPDH in AD brain tissue and transgenic mice\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — enzymatic activity assay, cellular localization, and AD tissue/mouse model comparison; single lab\",\n      \"pmids\": [\"16186172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GAPDH overexpression in T cells activates the non-canonical NF-κB pathway in transgenic mice, leading to development of a peripheral Tfh-like lymphoma recapitulating human angioimmunoblastic T cell lymphoma (AITL); NIK inhibition targeting NF-κB signaling prolonged survival of AITL-bearing mice.\",\n      \"method\": \"T cell-specific GAPDH transgenic mouse model; NF-κB pathway analysis; histology and immunophenotyping; NIK inhibitor treatment\",\n      \"journal\": \"Cancer Cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic mouse model with defined molecular pathway (non-canonical NF-κB) and pharmacological rescue; single lab\",\n      \"pmids\": [\"31447347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GAPDH depletion in human lung carcinoma cells causes accelerated cellular senescence (proliferation arrest, morphology change, SA-β-galactosidase staining, upregulation of DEC1 and GLB1) via sustained AMPK activation through phosphorylation of its α subunit at Thr172, in the absence of DNA damage; this is dependent on compromised glycolysis and energy crisis, and occurs independently of LKB1.\",\n      \"method\": \"GAPDH siRNA knockdown; SA-β-galactosidase staining; AMPK Thr172 phosphorylation measurement; metabolic and genetic rescue experiments\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — knockdown with senescence phenotype and defined signaling node (AMPK); rescue experiments; single lab\",\n      \"pmids\": [\"21749859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GAPDH interacts with apurinic/apyrimidinic (AP) sites in DNA by forming Schiff-base intermediates (borohydride-trappable); the interaction depends on GAPDH SH-groups (disulfide reduction abolishes adduct formation); GAPDH does not exhibit AP lyase activity despite forming adducts.\",\n      \"method\": \"NaBH4 crosslinking; mass spectrometry peptide mapping; AP site binding assay with purified GAPDH; thiol reduction experiments\",\n      \"journal\": \"Mutation Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — biochemical crosslinking with purified protein, MS identification, negative result (no AP lyase) explicitly confirmed; single lab\",\n      \"pmids\": [\"26203648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GAPDH delivers heme to IDO1 and TDO via direct interaction; overexpression of GAPDH increased heme delivery to apo-IDO1 and apo-TDO in cells; Hsp90 interacted with apo-IDO1 but not apo-TDO and was required only for IDO1 heme insertion, not TDO.\",\n      \"method\": \"GAPDH overexpression/knockdown in cells; Co-IP (GAPDH-IDO1, GAPDH-TDO, Hsp90 interactions); IDO1/TDO heme content measurement; heme-deficient HEK293T cell system\",\n      \"journal\": \"Free Radical Biology & Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, overexpression/knockdown with functional heme measurement, and in vitro interaction studies; single lab\",\n      \"pmids\": [\"35051612\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GAPDH is a tetrameric glycolytic enzyme that catalyzes the oxidative phosphorylation of glyceraldehyde-3-phosphate via a conserved active-site cysteine (Cys152 in human); this cysteine acts as a versatile redox switch—subject to S-nitrosylation (by NO/iNOS/nNOS), S-glutathionylation (by H2O2), succination (by fumarate/DMF), alkylation (by itaconate), and reversible oxidation (by H2O2)—that inactivates glycolysis, re-routes carbon to the pentose phosphate pathway, and enables GAPDH to adopt multiple non-glycolytic functions including: (1) binding Siah1 and translocating to the nucleus where it is acetylated by p300/CBP (at Lys160), trans-nitrosylates nuclear proteins (SIRT1, HDAC2, DNA-PK), and activates p53-dependent apoptosis; (2) acting as a heme chaperone delivering mitochondrially-generated heme to apo-sGC, IDO1, TDO, myoglobin, and hemoglobins; (3) binding TERC to inhibit telomerase; (4) associating with NAMPT to enable its nuclear translocation for NAD+ salvage; (5) translocating to the nucleus to facilitate DNA base excision repair via DNA Pol β; (6) appearing on the cell surface to function as a transferrin/lactoferrin/plasminogen receptor for iron homeostasis; and (7) being post-translationally modified by CARM1 methylation (Arg234) and VRK2/FBXW10-dependent ubiquitination (Ser151) to regulate glycolysis and NF-κB signaling in cancer.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GAPDH is a tetrameric glycolytic enzyme whose active-site cysteine (Cys152 in human; Cys150/Cys152 in rodent and yeast orthologs) functions as a versatile redox switch that couples metabolic flux to a diverse repertoire of non-glycolytic, signaling functions [#0, #20]. Quantitatively, GAPDH together with PGK1 operates near equilibrium and defines a rate-controlling node of glycolysis: flux is buffered until GAPDH activity falls below ~19% of normal, after which glycolysis declines proportionally [#21]. The catalytic cysteine is the convergence point for many covalent and oxidative modifications that inactivate the enzyme and re-route metabolism: reversible S-nitrosylation by NO/iNOS/nNOS [#0, #1], S-glutathionylation and reversible oxidation by H2O2 [#16, #20], H2S-dependent sulfhydration [#15], succination by dimethyl/monomethyl fumarate (structurally shown to block NAD+ binding) [#7, #24], and alkylation at Cys22 by itaconate [#9]; the enzyme is additionally regulated by CARM1 methylation at Arg234 [#8], δPKC phosphorylation that disrupts tetramerization [#19], VRK2/FBXW10-dependent phosphorylation/ubiquitination at Ser151 [#27], and TGM2-catalyzed serotonylation at Gln262 [#23]. These modifications loss of glycolytic activity divert carbon toward the oxidative pentose phosphate pathway and reductive metabolism under oxidative stress, a switch required for anchorage-independent and tumor growth [#20]. Inactivation of GAPDH underlies the anti-inflammatory actions of fumarate and itaconate by suppressing glycolysis in immune cells [#7, #9] and the selective vulnerability of glycolytic KRAS/BRAF-mutant tumors to oxidative GAPDH inactivation [#6]. Modification of the catalytic cysteine also drives nuclear translocation: S-nitrosylated GAPDH binds the E3 ligase Siah1 and is carried to the nucleus, where it is acetylated at Lys160 by p300/CBP, stimulates p300/CBP activity and p53-dependent apoptosis, and trans-modifies nuclear targets including SIRT1, HDAC2 and DNA-PK [#1, #2, #5, #11, #16]; this axis drives neuronal death and Aβ-induced tau acetylation in Alzheimer models, and is restrained by the cytosolic anchor GOSPEL [#4, #17]. Beyond apoptosis, nuclear GAPDH supports base excision repair through DNA polymerase β following Src-mediated Tyr41 phosphorylation [#14], partners with NAMPT to sustain nuclear NAD+ salvage [#13], and binds the telomerase RNA TERC to inhibit telomerase [#10]. GAPDH additionally moonlights as a heme chaperone delivering heme to apo-sGCβ1, IDO1, TDO, and globins in complex with Hsp90 [#12, #18, #36], and as a cell-surface receptor for transferrin/lactoferrin (iron homeostasis) and plasminogen (macrophage migration) [#25, #26]. In cancer, GAPDH promotes NF-κB signaling via TRAF2 and drives a T-cell lymphoma phenotype when overexpressed [#27, #33].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that nitric oxide directly and reversibly inhibits GAPDH by modifying its active-site cysteine, defining the foundational redox-switch chemistry rather than ADP-ribosylation.\",\n      \"evidence\": \"In vitro assays with purified GAPDH and endothelial cells, stoichiometric nitrosylation quantification, substrate-protection and thiol-reversal controls\",\n      \"pmids\": [\"7573405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not connect cysteine nitrosylation to any downstream cellular function\", \"No structural detail of the modified cysteine\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked active-site S-nitrosylation to a cell-fate program by showing modified GAPDH binds Siah1 and translocates to the nucleus to trigger cytotoxicity, transforming GAPDH from a metabolic enzyme into an apoptotic signaling molecule.\",\n      \"evidence\": \"Co-IP, NOS inhibitor and binding-interference experiments, nuclear translocation assays, Cys150 mutagenesis\",\n      \"pmids\": [\"16574384\", \"16633896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nuclear effector targets of the GAPDH-Siah1 complex not yet defined\", \"Physiological versus pathological triggers not separated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined the nuclear effector mechanism of translocated GAPDH (p300/CBP acetylation at Lys160 driving p53 apoptosis) and identified GAPDH as a redox-sensing component of a stress MAPK phosphorelay in yeast, generalizing the moonlighting paradigm.\",\n      \"evidence\": \"Co-IP, acetyltransferase activity assays, K160R dominant-negative mutagenesis; yeast genetic epistasis with Cys152 oxidation monitoring\",\n      \"pmids\": [\"18552833\", \"18406331\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetylation site mapping in vivo limited to single residue\", \"Conservation of the yeast phosphorelay role in mammals not addressed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified GOSPEL as a cytosolic anchor competing with Siah1, establishing that nuclear translocation is actively regulated and providing a neuroprotective brake.\",\n      \"evidence\": \"Reciprocal Co-IP, competition binding, Cys47 mutagenesis, neuronal overexpression/knockdown, in vivo viral delivery\",\n      \"pmids\": [\"19607794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of GOSPEL-GAPDH-Siah1 competition unresolved\", \"GOSPEL's broader functions unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Extended GAPDH moonlighting to telomere biology and extracellular receptor functions, showing TERC binding inhibits telomerase and surface GAPDH acts as a plasminogen receptor for macrophage migration.\",\n      \"evidence\": \"Co-IP, TRAP telomerase assay, domain-mapping mutagenesis, senescence assays; surface binding assays and macrophage migration in vivo\",\n      \"pmids\": [\"22847419\", \"28298336\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of GAPDH export to the cell surface unknown\", \"TERC-binding interface mapped only to catalytic-domain lysine\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed SNO-GAPDH transnitrosylates nuclear proteins (SIRT1, HDAC2, DNA-PK), providing a mechanism for delivering cytoplasmic NO signals to specific nuclear targets.\",\n      \"evidence\": \"In vitro transnitrosylation with purified proteins, cell-based Co-IP and translocation, Cys150 mutagenesis\",\n      \"pmids\": [\"20972425\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Selectivity determinants for nuclear target choice unclear\", \"Quantitative contribution versus direct NO nitrosylation not assessed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved the apoptotic effector mechanism (GAPDH-p53 complex enhancing p53 expression/phosphorylation) and characterized GAPDH-AP-site Schiff-base adducts and iron-transport receptor activity, expanding the moonlighting catalog.\",\n      \"evidence\": \"Co-IP and interfering-peptide disruption with in vivo stroke model; NaBH4 crosslinking and MS; surface GAPDH iron-transport Co-IP and knockdown\",\n      \"pmids\": [\"24670206\", \"26203648\", \"25074810\", \"22292499\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"GAPDH lacks AP lyase activity, so the functional role of AP-site adducts is undefined\", \"Surface GAPDH iron-handling isoform differences not molecularly defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that oxidative GAPDH inactivation is therapeutically exploitable, with high-dose vitamin C selectively killing glycolytic KRAS/BRAF-mutant colorectal cancer via ROS-mediated GAPDH inhibition.\",\n      \"evidence\": \"Cell viability and GAPDH activity assays, ROS/glutathione quantification, genetic mutant comparison, Apc/KrasG12D mouse model\",\n      \"pmids\": [\"26541605\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether GAPDH is the sole oxidative-stress target driving death not fully isolated\", \"Modification chemistry on the cysteine not site-mapped in this study\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Established immunometabolic and oncogenic control of GAPDH activity through covalent succination (DMF) and arginine methylation (CARM1), and linked SNO-GAPDH/p300/SIRT1 signaling to tau acetylation in Alzheimer pathology.\",\n      \"evidence\": \"MS-confirmed Cys152 succination with flux analysis and in vivo immune readouts; in vitro methyltransferase and R234 mutant rescue with HCC samples; C150S mutant and CGP3466B rescue in Aβ mouse model and AD tissue\",\n      \"pmids\": [\"29599194\", \"30232003\", \"29559585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between competing modifications on the same enzyme not resolved\", \"Relative contribution of glycolytic loss versus moonlighting effects in disease unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided the structural explanation for fumarate-derivative inhibition and added itaconate alkylation at Cys22 as an anti-inflammatory mechanism, while linking GAPDH overexpression to NF-κB-driven T-cell lymphoma.\",\n      \"evidence\": \"2.29 Å crystal structure of MMF-Cys152 adduct with activity assay; 4-OI alkylation, U13C tracing and C22A rescue; T-cell GAPDH transgenic mouse with NIK inhibition\",\n      \"pmids\": [\"31387164\", \"31704924\", \"31447347\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cys22 is distinct from the catalytic Cys152, so distinct functional consequences need separation\", \"Mechanism connecting GAPDH levels to non-canonical NF-κB not molecularly defined here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined GAPDH as a heme chaperone delivering heme to apo-sGCβ1 and as a nuclear partner of NAMPT for NAD+ salvage and DNA polymerase β for base excision repair, establishing chaperone and genome-maintenance moonlighting roles with defined regulatory inputs.\",\n      \"evidence\": \"In vitro heme transfer with purified proteins and live-cell reporter; SPR/SAXS/Co-IP for NAMPT complex; Src kinase assay and Tyr41 mutant with Pol β Co-IP and BER assay\",\n      \"pmids\": [\"32358060\", \"31988240\", \"32539222\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source and trafficking of GAPDH-bound heme within cells incompletely defined\", \"How a single enzyme partitions among heme, NAD+ and BER roles is unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Quantified GAPDH's rate-controlling threshold in glycolysis and connected additional redox modifications (H2S sulfhydration, glutathionylation) and modification crosstalk to nuclear translocation, apoptosis, autophagy and aging phenotypes.\",\n      \"evidence\": \"siRNA/iodoacetate titration with metabolite and thermodynamic analysis; sulfhydration and glutathionylation Co-IP series with mutants and functional readouts; S-nitrosation proteomics in aged muscle\",\n      \"pmids\": [\"33545174\", \"33459133\", \"34332079\", \"34973445\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether distinct cysteine modifications produce identical or distinct nuclear outcomes is unresolved\", \"Single-lab studies for several signaling axes lack reciprocal cross-validation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established with a genetic knock-in that the GAPDH redox switch itself is required to route carbon to the oxidative PPP and support tumor growth, and identified serotonylation, acetate-driven acetylation, and VRK2/FBXW10/TRAF2 axes as activity-tuning inputs across immunity and cancer.\",\n      \"evidence\": \"Redox-switch knock-in mice/cells with flux analysis and tumor models; TGM2 serotonylation at Gln262 with CAR-T transfer; neutrophil NET assays; ubiquitination/phosphorylation biochemistry and NF-κB reporter with HCC mouse model\",\n      \"pmids\": [\"37024754\", \"38215751\", \"37147288\", \"37450367\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Integration of the many activity-tuning modifications into a unified regulatory logic is lacking\", \"Acetylation site and acetyltransferase for the activating acetylation not identified [#31]\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single enzyme integrates competing cysteine and non-cysteine modifications to select among glycolytic, apoptotic, heme-chaperone, DNA-repair, and receptor functions, and what governs its localization to nucleus, cell surface, and extracellular space, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of modification crosstalk and functional partitioning\", \"Trafficking machinery for surface/extracellular GAPDH unknown\", \"Structural basis for most moonlighting partner interactions undetermined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 7, 21, 24]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [5, 29]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [12, 18, 36]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [35]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [25, 26]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0, 3, 20]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 21, 23]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 2, 5, 11, 13, 14, 16]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [25, 26, 29]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 7, 9, 20, 21]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 2, 11, 16, 28]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 3, 16, 20]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [14, 35]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [7, 9, 22, 23, 33]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 27, 33]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SIAH1\", \"GOSPEL\", \"EP300\", \"SIRT1\", \"NAMPT\", \"TERC\", \"POLB\", \"TRAF2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}