{"gene":"ADH5","run_date":"2026-06-09T22:02:42","timeline":{"discoveries":[{"year":1992,"finding":"ADH5 (chi-ADH/FDH) gene structure was characterized: it is composed of nine exons and eight introns, has a CpG-island promoter lacking TATA and CAAT boxes (consistent with ubiquitous expression), and a 1.5-kb upstream fragment drives reporter transcription in CV-1 cells. Two major transcription start points were identified by primer extension.","method":"Genomic cloning, primer extension, reporter (CAT) assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic characterization with functional reporter assay, single lab, multiple complementary methods","pmids":["1446828"],"is_preprint":false},{"year":1999,"finding":"ADH5/FDH transcription is driven by Sp1 binding to two core cis-elements (−22 bp to +22 bp) in the minimal promoter; Sp3 and Sp4 repress transcription by competing with Sp1 for these same elements without activating transcription themselves.","method":"Mutagenesis of cis-elements, electrophoretic mobility shift assay (EMSA), transient transfection/luciferase reporter in Drosophila SL2 cells (lacking endogenous Sp1)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of critical cis-elements combined with heterologous cell system and EMSA, multiple orthogonal methods in one study","pmids":["9867805"],"is_preprint":false},{"year":2002,"finding":"The POZ domain transcription factor FBI-1 represses ADH5/FDH transcription by directly interacting (via its POZ domain) with the zinc-finger DNA-binding domain of Sp1, preventing Sp1 binding to GC boxes of the ADH5 promoter.","method":"EMSA, chromatin immunoprecipitation (ChIP), GST pulldown, DNase I footprinting, Gal4 fusion reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct protein–protein interaction confirmed by GST pulldown, DNA-binding interference by DNase I footprinting, in vivo occupancy by ChIP, multiple orthogonal methods","pmids":["12004059"],"is_preprint":false},{"year":2010,"finding":"GSNOR deficiency leads to S-nitrosylation and proteasomal degradation of the DNA repair protein O6-alkylguanine-DNA alkyltransferase (AGT/MGMT), impairing repair of carcinogenic O6-alkylguanines and promoting hepatocarcinogenesis; these effects are abolished in GSNOR/iNOS double-knockout mice, placing iNOS upstream of GSNOR-regulated S-nitrosylation.","method":"GSNOR-knockout mouse model, iNOS/GSNOR double-knockout epistasis, immunoblot for AGT, O6-alkylguanine DNA adduct measurement, carcinogen (DEN) challenge","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis (double KO), biochemical measurement of substrate (AGT) and DNA adducts, replicated with iNOS inhibitor in follow-up study","pmids":["20371487"],"is_preprint":false},{"year":2011,"finding":"Hepatocyte-specific (not hematopoietic-cell) deletion of GSNOR is sufficient to cause AGT depletion and increased DNA double-strand breaks (γH2AX) upon inflammatory stimulation, and increases DEN-induced mortality in an iNOS-dependent manner.","method":"Conditional (hepatocyte-specific) GSNOR knockout mice, hematopoietic-cell GSNOR knockout mice (negative control), immunoblot for AGT, γH2AX staining, iNOS/GSNOR double-knockout rescue","journal":"Carcinogenesis","confidence":"High","confidence_rationale":"Tier 2 / Strong — cell-type-specific conditional KO with genetic rescue (iNOS co-deletion), multiple biochemical readouts, replication of AGT-depletion mechanism","pmids":["21385828"],"is_preprint":false},{"year":2013,"finding":"Pharmacological inhibition of iNOS (with 1400W) blocks AGT depletion and restores O6-ethyldeoxyguanosine repair in GSNOR-deficient livers, and short-term iNOS inhibition after DEN treatment reduces HCC multiplicity and burden in GSNOR-knockout mice to wild-type levels.","method":"GSNOR-knockout mice, iNOS inhibitor (1400W) treatment, immunoblot for AGT, O6-ethyldeoxyguanosine measurement, tumor counting","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — pharmacological and genetic manipulation converge on same pathway, quantitative tumor and molecular endpoints, replication of iNOS→GSNOR→AGT axis","pmids":["23440427"],"is_preprint":false},{"year":2013,"finding":"GSNOR deficiency in mesenchymal stem cells (MSCs) impairs vasculogenesis in vitro and in vivo, associated with downregulation of PDGFRα; pharmacologic NO synthase inhibition (L-NAME) or GHRH agonists restore tube formation by normalizing VEGF-A/PDGFRα signaling.","method":"GSNOR-knockout MSCs, Matrigel tube-formation assay, in vivo vasculogenesis model, PDGFR antagonist, L-NAME treatment, GHRH agonists","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with in vitro and in vivo assays and pharmacological rescue, single lab","pmids":["23288904"],"is_preprint":false},{"year":2016,"finding":"GSNOR is itself subject to inhibitory S-nitrosation at conserved non-zinc-coordinating cysteine residues; nitrosation reduces catalytic activity (reversible by DTT), promotes thermal aggregation and increased polydispersity, and alters the shape of substrate/coenzyme binding pockets as shown by HDX-MS. Site-directed mutagenesis of specific cysteines reduces sensitivity to nitrosating agents.","method":"In vitro enzyme activity assays with nitrosating agents and DTT reversal, mass spectrometry (nitrosation site identification), site-directed mutagenesis, tryptophan fluorescence, thermal aggregation, hydrogen-deuterium exchange MS (HDX-MS); human, plant, and yeast GSNORs tested","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with mutagenesis, multiple orthogonal methods (MS, HDX-MS, fluorescence, activity assay), cross-species validation","pmids":["27064847"],"is_preprint":false},{"year":2017,"finding":"Increased GSNOR expression in the hippocampus during aging decreases S-nitrosation of CaMKIIα at Cys280/Cys289, reducing its synaptosomal accumulation and downstream p(S831)-GluR1 phosphorylation, causing LTP defects and cognitive impairment; GSNOR knockout rescues these age-related deficits.","method":"GSNOR transgenic (neuron-specific overexpression) and knockout mice, Morris water maze/fear conditioning/Y-maze behavioral tests, LTP electrophysiology, synaptosomal fractionation, biotin-switch assay for S-nitrosation, CaMKIIα C280/C289 site-directed mutagenesis","journal":"The Journal of neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic gain- and loss-of-function with mutagenesis of S-nitrosation sites, multiple behavioral and biochemical endpoints, single lab with multiple orthogonal methods","pmids":["28883020"],"is_preprint":false},{"year":2018,"finding":"GSNOR depletion increases S-nitrosylation of Akt at Cys224, which reduces Akt phosphorylation at Ser473 and suppresses T-cell activation; GSNOR knockout in ApoE-/- mice reduces T-cell-driven atherosclerosis under hyperhomocysteinemia conditions.","method":"GSNOR-knockout/ApoE-double-knockout mice, adoptive T-cell transfer, site-directed mutagenesis (Akt C224), biotin-switch for S-nitrosylation, flow cytometry, immunoblot","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with mutagenesis of specific nitrosation site, in vivo adoptive transfer, multiple orthogonal methods","pmids":["29860106"],"is_preprint":false},{"year":2019,"finding":"GSNOR allosteric activation by its own substrate GSNO was demonstrated kinetically (Hill coefficient ~1.75); an allosteric GSNO-binding site comprising residues Asn185, Lys188, Gly321, and Lys323 was identified by docking, molecular dynamics, and HDX-MS; K188A and K323A mutations abolish allosteric behavior.","method":"Enzyme kinetics (Hill-Langmuir equation), molecular docking, molecular dynamics simulation, HDX-MS, site-directed mutagenesis (K188A, K323A)","journal":"Antioxidants (Basel, Switzerland)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinetics with mutagenesis and HDX-MS structural validation, multiple orthogonal methods in one study","pmids":["31766125"],"is_preprint":false},{"year":2019,"finding":"nNOS and GSNOR co-localize at the sarcolemma and co-immunoprecipitate in C2C12 myotubes and myofibers; GSNOR expression decreases in mouse models of muscular dystrophy, aging, and ALS, indicating a physical and functional interaction relevant to skeletal muscle homeostasis.","method":"Co-immunoprecipitation, immunofluorescence co-localization, expression analysis in dystrophic/ALS/aged muscle, C2C12 differentiation model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP interaction confirmed, co-localization by immunofluorescence, multiple disease models, single lab","pmids":["31043586"],"is_preprint":false},{"year":2020,"finding":"GSNOR translation is induced by hydrogen peroxide and mitochondrial ROS via a signaling cascade: redox activation of ATM → phosphorylation of CHK2 and p53 → increased GSNOR protein levels; this ATM/GSNOR axis sustains mitophagy and influences T-cell activation.","method":"siRNA knockdown, selective pharmacological inhibitors of ATM/CHK2, immunoblot, flow cytometry (mitophagy markers), redox-insensitive ATM mutant expression","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and genetic (siRNA, ATM mutant) dissection of pathway, single lab, multiple readouts","pmids":["33245190"],"is_preprint":false},{"year":2020,"finding":"Combined deficiency of ADH5 (formaldehyde dehydrogenase) and ALDH2 causes AMeD syndrome; cellular studies showed decreased formaldehyde tolerance underlies loss of hematopoietic stem cell differentiation/proliferation capacity; Adh5 E506K/E506K mice recapitulated dwarfism, short lifespan, and hematopoietic failure.","method":"Patient-derived cellular studies, ADH5/ALDH2 double-knockout/knock-in mouse model, hematopoietic stem cell functional assays, formaldehyde exposure experiments","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic syndrome combined with mouse model recapitulation and cellular mechanistic studies, multiple orthogonal approaches","pmids":["33355142"],"is_preprint":false},{"year":2021,"finding":"ADH5 is the primary cellular defense against formaldehyde (ALDH2 is a backup); ADH5/ALDH2-deficient iPSCs show drastically defective hematopoietic differentiation with increased DNA damage when stimulated, partially reversed by ALDH2 agonist C1; lymphocytes from patients show elevated sister chromatid exchanges reflecting homologous recombination repair of formaldehyde damage.","method":"Patient-derived iPSCs, disease model cell lines, hematopoietic differentiation assays, SCE assay, DNA damage markers, ALDH2 agonist (C1) rescue","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — patient-derived models combined with iPSC differentiation assays and pharmacological rescue, multiple cell types and endpoints","pmids":["33512438"],"is_preprint":false},{"year":2021,"finding":"ADH5-mediated denitrosylation regulates brown adipose tissue (BAT) thermogenesis: loss of ADH5 in BAT impairs cold-induced UCP1-dependent thermogenesis and worsens obesity-associated metabolic dysfunction; ADH5 expression in BAT is induced by transcription factor HSF1, and HSF1 activator administration increases ADH5 expression and improves UCP1-mediated respiration.","method":"BAT-specific ADH5 knockout mice, cold exposure challenge, UCP1-dependent respiration assay, HSF1 activator pharmacology, ChIP/reporter for HSF1→Adh5 transcription","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with cold challenge and pharmacological rescue, single lab, multiple metabolic endpoints","pmids":["34788615"],"is_preprint":false},{"year":2021,"finding":"GSNOR deficiency increases S-nitrosylation of TANK-binding kinase 1 (TBK1) at Cys423, inhibiting TBK1 kinase activity and reducing interferon production, thereby impairing antiviral innate immune responses; GSNOR-deficient mice show higher mortality upon HSV-1 infection.","method":"GSNOR-knockout MEFs and macrophages, viral infection assays (HSV-1, VSV), biotin-switch for TBK1 S-nitrosation at Cys423, kinase activity assay, N6022 GSNOR inhibitor, interferon ELISA","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO and pharmacological inhibitor converge, specific nitrosation site identified, kinase activity measured, in vivo mortality endpoint","pmids":["34678655"],"is_preprint":false},{"year":2022,"finding":"ADH5/GSNOR deficiency impairs STING-dependent innate immune responses; GSNO (whose catabolism is mediated by ADH5) induces S-nitrosylation of STING at Cys257, inhibiting its binding to cGAMP; ADH5 facilitates STING activation by maintaining low cellular SNO levels.","method":"Adh5-knockout mice, viral/bacterial infection models (HSV-1, Listeria), biotin-switch for STING S-nitrosylation at Cys257, cGAMP-binding assay, interferon production measurement","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO, specific nitrosation site identified, direct binding assay, in vivo infection model, multiple orthogonal methods","pmids":["38409248"],"is_preprint":false},{"year":2022,"finding":"GSNOR deficiency induces S-nitrosylation of MAPK14 (p38) at Cys211, increasing MAPK14 kinase activity and promoting NLRP3 inflammasome transcription (Nlrp3, Il-1β); Gsnor-/-Nlrp3-/- double-knockout mice have reduced disease severity in LPS-induced septic shock and DSS-induced colitis models.","method":"GSNOR-knockout macrophages, GSNOR/NLRP3 double-knockout mice, biotin-switch for MAPK14 S-nitrosation at Cys211, MAPK14 kinase activity assay, LPS septic shock and DSS colitis in vivo models","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific nitrosation site, kinase activity assay, in vivo epistasis with double KO, multiple disease models","pmids":["38570588"],"is_preprint":false},{"year":2023,"finding":"GSNOR deficiency induces S-nitrosylation of focal adhesion kinase 1 (FAK1) at Cys658, enhancing FAK1 autophosphorylation and enabling cancer cells to survive in suspension (anoikis resistance); GSNOR-deficient tumor models are susceptible to FAK1 inhibitors.","method":"GSNOR-deficient tumor cell lines and mouse models, biotin-switch/MS for FAK1 S-nitrosation at C658, FAK1 autophosphorylation assay, anoikis resistance assay, FAK1 inhibitor treatment","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific nitrosation site identified, functional autophosphorylation assay, in vivo tumor models, pharmacological validation","pmids":["36656716"],"is_preprint":false},{"year":2023,"finding":"GSNOR is localized in mitochondria (in addition to cytoplasm); mitochondrial GSNOR denitrosylates ANT1 at Cys160, maintaining mitochondrial membrane potential and mitophagy; cardiac-specific GSNOR knockout worsens heart failure, and restoration of mitochondrial GSNOR improves mitochondrial function and cardiac performance.","method":"Cellular fractionation, immunofluorescence, colloidal gold staining (electron microscopy), cardiac-specific GSNOR KO mice, AAV9-mitochondria-targeting GSNOR overexpression, biotin-switch + LC-MS/MS for ANT1 S-nitrosation at Cys160, ANT1 C160A mutant, mitochondrial membrane potential assay, transverse aortic constriction HF model","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — novel subcellular localization validated by three methods, specific substrate identified by MS, mutagenesis of S-nitrosation site, in vivo rescue experiment","pmids":["37377022"],"is_preprint":false},{"year":2022,"finding":"CDK5 S-nitrosation at Cys83 (increased by GSNOR deficiency) inhibits CDK5 kinase activity and CDK5-mediated autophagy; in an MPTP-induced Parkinson's disease mouse model, GSNOR knockout or N6022 inhibitor treatment alleviates CDK5-mediated autophagy and neurotoxicity.","method":"GSNOR-knockout mice, MPTP PD model, N6022 GSNOR inhibitor, biotin-switch for CDK5 S-nitrosation at Cys83, CDK5 kinase activity assay, behavioral tests, dopaminergic neuron counting","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific nitrosation site identified, kinase activity assay, genetic and pharmacological convergence, single lab","pmids":["35918012"],"is_preprint":false},{"year":2025,"finding":"NEDD4 E3 ubiquitin ligase ubiquitinates and degrades GSNOR under cardiac hypertrophy conditions; NEDD4 expression is elevated in hypertrophic myocardium while GSNOR mRNA remains unchanged; enzyme-dead NEDD4 mutant or non-ubiquitylatable GSNOR mutant decrease GSNOR ubiquitination and inhibit hypertrophic growth; NEDD4-specific inhibitors suppress this axis.","method":"Mass spectrometry identification of NEDD4 as E3 ligase, NEDD4 cardiomyocyte-specific KO mice, ubiquitination assays, NEDD4 enzyme-dead mutant and GSNOR non-ubiquitylatable mutant, protein synthesis/degradation inhibitors, in vivo transverse aortic constriction, clinical samples","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — MS identification, genetic KO, mutagenesis of ubiquitination sites, in vivo cardiac model, multiple converging experiments","pmids":["39846173"],"is_preprint":false},{"year":2021,"finding":"S-nitrosylation of GSK3β (increased in GSNOR-deficient iPSCs) reduces GSK3β expression and promotes cardiomyocyte differentiation and maturation from iPSCs; GSNO treatment of wild-type iPSCs phenocopies this effect.","method":"GSNOR-knockout iPSCs, directed cardiomyocyte differentiation assay, biotin-switch for GSK3β S-nitrosylation, GSNO treatment, Nkx2.5/Brachyury/GATA4 expression markers","journal":"The journal of cardiovascular aging","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO and pharmacological GSNO treatment convergence, specific substrate identified, single lab","pmids":["34790975"],"is_preprint":false},{"year":2014,"finding":"NF-κB binds the GSNOR promoter (−88 bp to −73 bp) in response to NGF/TrkA/MEK1-2 signaling, activating GSNOR transcription; in PC12 cells, GSNOR negatively regulates neurite outgrowth—overexpression decreases and knockdown promotes neuronal differentiation.","method":"Luciferase reporter assay, EMSA, ChIP, TrkA/MEK inhibitors, GSNOR overexpression and knockdown in PC12 cells, neurite morphometry","journal":"Free radical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo promoter occupancy by ChIP, functional gain/loss-of-function, multiple methods, single lab","pmids":["24654711"],"is_preprint":false},{"year":2026,"finding":"GSNOR denitrosates Beclin-1 at Cys351; S-nitrosation of Beclin-1 at this site enhances its interaction with ATG14 and increases autophagy, promoting beige-to-white adipocyte conversion during aging; adipose-specific GSNOR overexpression promotes adipose whitening and metabolic decline.","method":"GSNOR adipose-specific knock-in and knockout mice, aging cohorts, biotin-switch for Beclin-1 S-nitrosation at Cys351, Beclin-1 C351A mutant, Beclin-1/ATG14 co-immunoprecipitation, mitochondrial content and beige adipocyte quantification","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — specific S-nitrosation site with mutagenesis, binding partner co-IP, conditional KO and KI mouse models, multiple converging endpoints","pmids":["41730881"],"is_preprint":false},{"year":2033,"finding":"N6022 (GSNOR inhibitor) interferes with the interaction between GSNOR and GSTP1, boosting GSTP1 antioxidant activity and attenuating microglia ferroptosis; GSNOR inhibition also promotes Nrf2 nuclear translocation in cerebral ischemia/reperfusion injury models.","method":"OGD/R cell model and MCAO/R mouse model, co-immunoprecipitation (GSNOR–GSTP1 interaction), Nrf2 nuclear fractionation, SLC7A11-GPX4 pathway analysis, infarct volume measurement","journal":"European journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-IP for GSNOR–GSTP1 interaction, in vitro and in vivo models, multiple endpoints, single lab","pmids":["38574838"],"is_preprint":false},{"year":2025,"finding":"ADH5 loss in FANCA-deficient keratinocytes causes synthetic lethality and elevates formaldehyde levels and DNA damage markers; ADH5 is the primary formaldehyde defense in keratinocytes, cooperating with ALDH2 and DNA polymerase theta (Polθ); genetic or pharmacological targeting of ADH5 enhances Polθ-inhibitor efficacy in leukemic cells.","method":"Systematic CRISPR inactivation of ADH/ALDH genes in FANCA-deficient keratinocyte cell lines, formaldehyde level measurement, DNA damage marker assays, NAC rescue experiment, Polθ inhibitor combination studies","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — systematic genetic screen with functional validation, multiple cell lines, formaldehyde measurement; preprint, not yet peer-reviewed","pmids":["bio_10.1101_2025.11.13.688345"],"is_preprint":true}],"current_model":"ADH5/GSNOR is a cytoplasmic (and mitochondrial) NADH-dependent denitrosylase that catabolizes S-nitrosoglutathione (GSNO) and formaldehyde-glutathione adducts, thereby controlling cellular S-nitrosylation levels; it denitrosylates specific substrates including ANT1 (Cys160), AGT/MGMT (protecting DNA repair), TBK1 (Cys423, enabling interferon production), STING (Cys257, enabling cGAMP binding), FAK1 (Cys658, suppressing anoikis resistance), CaMKIIα (Cys280/289, supporting synaptic plasticity), Akt (Cys224, modulating T-cell activation), MAPK14 (Cys211, limiting NLRP3 inflammasome), CDK5 (Cys83, limiting autophagy), GSK3β, and Beclin-1 (Cys351, regulating autophagy/adipose remodeling); GSNOR expression is transcriptionally regulated by Sp1 (activated), and repressed by Sp3/Sp4 competition and FBI-1/POZ-domain interaction with Sp1, and induced by NF-κB downstream of NGF, and at the translational level by the ATM→CHK2→p53 redox cascade; GSNOR protein stability is regulated by NEDD4-mediated ubiquitination and proteasomal degradation, and its own catalytic activity is subject to inhibitory S-nitrosation at conserved non-zinc-coordinating cysteines; GSNOR also contains an allosteric GSNO-binding site (Lys188, Lys323) that activates the enzyme at high GSNO concentrations; physiologically, GSNOR loss promotes hepatocarcinogenesis via AGT depletion, impairs antiviral immunity, exacerbates cardiac hypertrophy/failure, causes hematopoietic stem cell failure when combined with ALDH2 deficiency (AMeD syndrome), and disrupts skeletal muscle, adipose, and neuronal homeostasis."},"narrative":{"mechanistic_narrative":"ADH5 (also called GSNOR, chi-ADH/FDH) is a ubiquitously expressed, NADH-dependent enzyme that serves as the master controller of cellular S-nitrosylation and as the primary cellular defense against formaldehyde, catabolizing S-nitrosoglutathione (GSNO) and formaldehyde-glutathione adducts to govern the nitrosative and aldehyde load across many tissues [PMID:20371487, PMID:33355142]. As a denitrosylase, ADH5 limits the S-nitrosation of a broad substrate set, and its loss therefore drives substrate-specific gain or loss of function: it protects the DNA-repair protein AGT/MGMT from S-nitrosylation-driven degradation, with iNOS acting upstream so that hepatocyte-specific loss promotes O6-alkylguanine accumulation, DNA double-strand breaks, and hepatocarcinogenesis [PMID:20371487, PMID:21385828, PMID:23440427]. The same denitrosylase logic tunes innate immunity and inflammation—ADH5 keeps TBK1 (Cys423) and STING (Cys257) free of inhibitory S-nitrosation to permit interferon production [PMID:34678655, PMID:38409248], while restraining MAPK14 (Cys211)-driven NLRP3 inflammasome activation [PMID:38570588]—and modulates kinase signaling on Akt (Cys224) in T cells [PMID:29860106], FAK1 (Cys658) in anoikis resistance [PMID:36656716], CaMKIIα (Cys280/289) in synaptic plasticity [PMID:28883020], and CDK5 (Cys83) in autophagy [PMID:35918012]. A mitochondrial pool of ADH5 denitrosylates ANT1 (Cys160) to preserve membrane potential and protect against heart failure [PMID:37377022], and it denitrosylates Beclin-1 (Cys351) to limit autophagy-driven adipose remodeling [PMID:41730881]. ADH5 expression is activated by Sp1 and repressed by Sp3/Sp4 competition and by FBI-1/POZ-domain sequestration of Sp1 [PMID:9867805, PMID:12004059], induced via NF-κB downstream of NGF [PMID:24654711] and by an ATM→CHK2→p53 redox cascade [PMID:33245190], and its protein level is set by NEDD4-mediated ubiquitination and degradation [PMID:39846173]; the enzyme is itself feedback-regulated by inhibitory S-nitrosation of non-zinc-coordinating cysteines and by allosteric activation through a GSNO-binding site (Lys188, Lys323) [PMID:27064847, PMID:31766125]. Combined deficiency of ADH5 and ALDH2 causes AMeD syndrome, in which impaired formaldehyde clearance drives hematopoietic stem cell failure, dwarfism, and DNA damage [PMID:33355142, PMID:33512438].","teleology":[{"year":1992,"claim":"Established the genomic architecture and ubiquitous-expression promoter of ADH5, providing the foundation for understanding its broad tissue distribution.","evidence":"Genomic cloning, primer extension, and CAT reporter assay in CV-1 cells","pmids":["1446828"],"confidence":"Medium","gaps":["Did not identify the trans-acting factors driving the promoter","No link yet to enzymatic function"]},{"year":2002,"claim":"Defined how ADH5 transcription is set by competing GC-box factors, showing Sp1 activates and Sp3/Sp4 and FBI-1 repress via interference with Sp1 binding.","evidence":"Cis-element mutagenesis, EMSA, and reporter assays in SL2 cells (1999); GST pulldown, ChIP, and DNase I footprinting for FBI-1–Sp1 (2002)","pmids":["9867805","12004059"],"confidence":"High","gaps":["Did not establish how these inputs respond to nitrosative or metabolic state","Physiological contexts that engage each factor unresolved"]},{"year":2013,"claim":"Linked ADH5/GSNOR loss to cancer by showing it protects the DNA-repair enzyme AGT/MGMT from iNOS-driven S-nitrosylation and degradation, placing iNOS upstream of GSNOR-controlled hepatocarcinogenesis.","evidence":"GSNOR-knockout, hepatocyte-specific conditional KO, and iNOS double-KO/inhibitor mouse studies with AGT immunoblot, DNA-adduct, and tumor endpoints","pmids":["20371487","21385828","23440427"],"confidence":"High","gaps":["Did not define the full set of repair-relevant denitrosylation substrates","Cell-autonomous vs systemic contributions not fully separated"]},{"year":2016,"claim":"Revealed that GSNOR is autoregulated, with inhibitory S-nitrosation of non-zinc cysteines reducing catalytic activity and altering binding-pocket conformation, establishing feedback control of the denitrosylase by its own product.","evidence":"In vitro activity assays with DTT reversal, MS, HDX-MS, fluorescence, and site-directed mutagenesis across human, plant, and yeast enzymes","pmids":["27064847"],"confidence":"High","gaps":["In vivo significance of inhibitory nitrosation under physiological NO flux not quantified","Interplay with allosteric activation not resolved"]},{"year":2017,"claim":"Extended GSNOR's denitrosylase role to the brain, showing it controls CaMKIIα (Cys280/289) S-nitrosation, synaptic accumulation, and LTP, with age-related overexpression causing cognitive decline.","evidence":"Neuron-specific transgenic and knockout mice, behavioral testing, LTP electrophysiology, biotin-switch, and CaMKIIα site mutagenesis","pmids":["28883020"],"confidence":"High","gaps":["Drivers of age-related GSNOR upregulation in hippocampus unspecified","Effect on other neuronal substrates not assessed"]},{"year":2019,"claim":"Provided the kinetic and structural basis for GSNOR's positive feedback, identifying an allosteric GSNO-binding site (Lys188, Lys323) that activates the enzyme at high substrate concentrations.","evidence":"Enzyme kinetics (Hill analysis), docking, molecular dynamics, HDX-MS, and K188A/K323A mutagenesis","pmids":["31766125"],"confidence":"High","gaps":["Allosteric site occupancy under cellular GSNO levels not measured","Crosstalk with inhibitory cysteine nitrosation unresolved"]},{"year":2021,"claim":"Defined ADH5 as the primary formaldehyde defense whose combined loss with ALDH2 causes AMeD syndrome, linking aldehyde clearance to hematopoietic stem cell maintenance and genome stability.","evidence":"Patient-derived cells and iPSCs, ADH5/ALDH2 double-KO/knock-in mice, hematopoietic differentiation, SCE and DNA-damage assays, and ALDH2 agonist rescue","pmids":["33355142","33512438"],"confidence":"High","gaps":["Relative tissue thresholds for formaldehyde toxicity not fully mapped","Connection between formaldehyde and denitrosylase functions of ADH5 not integrated"]},{"year":2022,"claim":"Showed GSNOR coordinates antiviral and inflammatory signaling by keeping TBK1 (Cys423), STING (Cys257), and MAPK14 (Cys211) appropriately denitrosylated, balancing interferon production against NLRP3 inflammasome activation.","evidence":"Knockout MEFs/macrophages, viral and bacterial infection models, biotin-switch site mapping, kinase and cGAMP-binding assays, and double-knockout epistasis","pmids":["34678655","38409248","38570588"],"confidence":"High","gaps":["Stimulus-specific control of which substrate dominates not resolved","Spatial coupling of GSNOR to immune signaling complexes unknown"]},{"year":2023,"claim":"Identified a mitochondrial pool of GSNOR that denitrosylates ANT1 (Cys160) to preserve membrane potential and protect the heart, expanding the enzyme's role beyond the cytoplasm.","evidence":"Cell fractionation, immunofluorescence, immuno-EM, cardiac-specific KO and mitochondria-targeted AAV9 rescue, MS site mapping, and ANT1 C160A mutant","pmids":["37377022"],"confidence":"High","gaps":["Mechanism of mitochondrial import not defined","Full mitochondrial substrate repertoire unknown"]},{"year":2025,"claim":"Established that GSNOR protein levels are controlled post-translationally by NEDD4-mediated ubiquitination, providing a degradation switch that drives cardiac hypertrophy when GSNOR is lost.","evidence":"MS identification of NEDD4, cardiomyocyte-specific NEDD4 KO, ubiquitination assays, enzyme-dead and non-ubiquitylatable mutants, TAC model, and clinical samples","pmids":["39846173"],"confidence":"High","gaps":["Signals activating NEDD4 toward GSNOR not fully defined","Interaction with transcriptional and translational regulation not integrated"]},{"year":2026,"claim":"Connected GSNOR denitrosylase activity to autophagy-driven adipose aging by showing it denitrosylates Beclin-1 (Cys351) to limit Beclin-1–ATG14 interaction and beige-to-white adipocyte conversion.","evidence":"Adipose-specific knock-in and knockout mice, aging cohorts, biotin-switch, Beclin-1 C351A mutant, and Beclin-1/ATG14 co-IP","pmids":["41730881"],"confidence":"High","gaps":["Generality of Beclin-1 control across autophagy contexts unknown","Relationship to CDK5-mediated autophagy regulation not reconciled"]},{"year":null,"claim":"How ADH5's formaldehyde-clearance and protein-denitrosylase functions are coordinated within a single tissue, and what determines substrate selectivity among its many reported targets, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking aldehyde detoxification and S-nitrosylation control","Substrate selection rules for denitrosylation not defined","Spatial organization of cytoplasmic vs mitochondrial pools relative to substrates incompletely mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase 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The Role of Smooth Muscle adh5.","date":"2021","source":"American journal of respiratory cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/33780653","citation_count":7,"is_preprint":false},{"pmid":"24654711","id":"PMC_24654711","title":"Activation of GSNOR transcription by NF-κB negatively regulates NGF-induced PC12 differentiation.","date":"2014","source":"Free radical research","url":"https://pubmed.ncbi.nlm.nih.gov/24654711","citation_count":7,"is_preprint":false},{"pmid":"32418890","id":"PMC_32418890","title":"Targeting GSNOR for functional recovery in a middle-aged mouse model of stroke.","date":"2020","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/32418890","citation_count":7,"is_preprint":false},{"pmid":"40539224","id":"PMC_40539224","title":"Phytophthora Disrupts Plant Immunity by Manipulating Nitric Oxide Homeostasis Through GSNOR Inhibition.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/40539224","citation_count":6,"is_preprint":false},{"pmid":"29606625","id":"PMC_29606625","title":"S-Nitrosoglutathione Reductase (GSNOR) Deficiency Results in Secondary Hypogonadism.","date":"2018","source":"The journal of sexual medicine","url":"https://pubmed.ncbi.nlm.nih.gov/29606625","citation_count":6,"is_preprint":false},{"pmid":"38330777","id":"PMC_38330777","title":"Differential S-nitrosylation and characterization of purified S-nitrosoglutathione reductase (GSNOR) from Brassica juncea shows multiple forms of the enzyme.","date":"2024","source":"Plant physiology and biochemistry : PPB","url":"https://pubmed.ncbi.nlm.nih.gov/38330777","citation_count":5,"is_preprint":false},{"pmid":"34458631","id":"PMC_34458631","title":"Trigenic ADH5/ALDH2/ADGRV1 mutations in myelodysplasia with Usher syndrome.","date":"2021","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/34458631","citation_count":5,"is_preprint":false},{"pmid":"34219079","id":"PMC_34219079","title":"[Aldehyde degradation deficiency (ADD) syndrome: discovery of a novel fanconi anemia-like inherited BMF syndrome due to combined ADH5/ALDH2 deficiency].","date":"2021","source":"[Rinsho ketsueki] The Japanese journal of clinical hematology","url":"https://pubmed.ncbi.nlm.nih.gov/34219079","citation_count":5,"is_preprint":false},{"pmid":"33545099","id":"PMC_33545099","title":"GSNOR and ALDH2 alleviate traumatic spinal cord injury.","date":"2021","source":"Brain research","url":"https://pubmed.ncbi.nlm.nih.gov/33545099","citation_count":4,"is_preprint":false},{"pmid":"37615925","id":"PMC_37615925","title":"Effects of the major formaldehyde catalyzer ADH5 on phenotypes of fanconi anemia zebrafish model.","date":"2023","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/37615925","citation_count":4,"is_preprint":false},{"pmid":"34790975","id":"PMC_34790975","title":"S-nitrosoglutathione reductase (GSNOR) deficiency accelerates cardiomyocyte differentiation of induced pluripotent stem cells.","date":"2021","source":"The journal of cardiovascular aging","url":"https://pubmed.ncbi.nlm.nih.gov/34790975","citation_count":4,"is_preprint":false},{"pmid":"31766125","id":"PMC_31766125","title":"Evidence for an Allosteric S-Nitrosoglutathione Binding Site in S-Nitrosoglutathione Reductase (GSNOR).","date":"2019","source":"Antioxidants (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/31766125","citation_count":4,"is_preprint":false},{"pmid":"6372555","id":"PMC_6372555","title":"Aldehyde oxidase and alcohol dehydrogenase genetics in the mouse. 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biology","url":"https://pubmed.ncbi.nlm.nih.gov/40631281","citation_count":0,"is_preprint":false},{"pmid":"41083002","id":"PMC_41083002","title":"Glycolysis Inhibition Restores Immune Sensitivity in GSNOR-Deficient Colorectal Cancer.","date":"2025","source":"Laboratory investigation; a journal of technical methods and pathology","url":"https://pubmed.ncbi.nlm.nih.gov/41083002","citation_count":0,"is_preprint":false},{"pmid":"41079602","id":"PMC_41079602","title":"ADH5 inhibits proliferation but promotes EMT in non-small cell lung cancer cell through activating Smad2/Smad3.","date":"2025","source":"Open life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41079602","citation_count":0,"is_preprint":false},{"pmid":"40033181","id":"PMC_40033181","title":"Assessing the association between ADH5 and ALDH1A1 genetic variants and substance use disorder risk in a Jordanian male population.","date":"2025","source":"BMC 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keratinocytes","date":"2025-11-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.11.13.688345","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.29.679193","title":"A Key Role for  <i>S-</i>  Nitrosylation in Immune Regulation and Development in the Liverwort  <i>Marchantia polymorpha</i>","date":"2025-09-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.29.679193","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.07.29.667470","title":"Formate reduces ischemic injury in female hearts lacking alcohol dehydrogenase 5","date":"2025-08-01","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.29.667470","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.12.20.629549","title":"Dysregulation of Nitrosylation Dynamics Promotes Nitrosative Stress and Contributes to Cardiometabolic Heart Failure with Preserved Ejection Fraction","date":"2024-12-24","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.20.629549","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.07.30.605885","title":"Disrupted Nitric Oxide Homeostasis Impacts Fertility Through Multiple Processes Including Protein Quality Control","date":"2024-07-31","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.30.605885","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":51970,"output_tokens":7784,"usd":0.136335,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17376,"output_tokens":4532,"usd":0.10009,"stage2_stop_reason":"end_turn"},"total_usd":0.236425,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1992,\n      \"finding\": \"ADH5 (chi-ADH/FDH) gene structure was characterized: it is composed of nine exons and eight introns, has a CpG-island promoter lacking TATA and CAAT boxes (consistent with ubiquitous expression), and a 1.5-kb upstream fragment drives reporter transcription in CV-1 cells. Two major transcription start points were identified by primer extension.\",\n      \"method\": \"Genomic cloning, primer extension, reporter (CAT) assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic characterization with functional reporter assay, single lab, multiple complementary methods\",\n      \"pmids\": [\"1446828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ADH5/FDH transcription is driven by Sp1 binding to two core cis-elements (−22 bp to +22 bp) in the minimal promoter; Sp3 and Sp4 repress transcription by competing with Sp1 for these same elements without activating transcription themselves.\",\n      \"method\": \"Mutagenesis of cis-elements, electrophoretic mobility shift assay (EMSA), transient transfection/luciferase reporter in Drosophila SL2 cells (lacking endogenous Sp1)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of critical cis-elements combined with heterologous cell system and EMSA, multiple orthogonal methods in one study\",\n      \"pmids\": [\"9867805\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The POZ domain transcription factor FBI-1 represses ADH5/FDH transcription by directly interacting (via its POZ domain) with the zinc-finger DNA-binding domain of Sp1, preventing Sp1 binding to GC boxes of the ADH5 promoter.\",\n      \"method\": \"EMSA, chromatin immunoprecipitation (ChIP), GST pulldown, DNase I footprinting, Gal4 fusion reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct protein–protein interaction confirmed by GST pulldown, DNA-binding interference by DNase I footprinting, in vivo occupancy by ChIP, multiple orthogonal methods\",\n      \"pmids\": [\"12004059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GSNOR deficiency leads to S-nitrosylation and proteasomal degradation of the DNA repair protein O6-alkylguanine-DNA alkyltransferase (AGT/MGMT), impairing repair of carcinogenic O6-alkylguanines and promoting hepatocarcinogenesis; these effects are abolished in GSNOR/iNOS double-knockout mice, placing iNOS upstream of GSNOR-regulated S-nitrosylation.\",\n      \"method\": \"GSNOR-knockout mouse model, iNOS/GSNOR double-knockout epistasis, immunoblot for AGT, O6-alkylguanine DNA adduct measurement, carcinogen (DEN) challenge\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis (double KO), biochemical measurement of substrate (AGT) and DNA adducts, replicated with iNOS inhibitor in follow-up study\",\n      \"pmids\": [\"20371487\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Hepatocyte-specific (not hematopoietic-cell) deletion of GSNOR is sufficient to cause AGT depletion and increased DNA double-strand breaks (γH2AX) upon inflammatory stimulation, and increases DEN-induced mortality in an iNOS-dependent manner.\",\n      \"method\": \"Conditional (hepatocyte-specific) GSNOR knockout mice, hematopoietic-cell GSNOR knockout mice (negative control), immunoblot for AGT, γH2AX staining, iNOS/GSNOR double-knockout rescue\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — cell-type-specific conditional KO with genetic rescue (iNOS co-deletion), multiple biochemical readouts, replication of AGT-depletion mechanism\",\n      \"pmids\": [\"21385828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Pharmacological inhibition of iNOS (with 1400W) blocks AGT depletion and restores O6-ethyldeoxyguanosine repair in GSNOR-deficient livers, and short-term iNOS inhibition after DEN treatment reduces HCC multiplicity and burden in GSNOR-knockout mice to wild-type levels.\",\n      \"method\": \"GSNOR-knockout mice, iNOS inhibitor (1400W) treatment, immunoblot for AGT, O6-ethyldeoxyguanosine measurement, tumor counting\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — pharmacological and genetic manipulation converge on same pathway, quantitative tumor and molecular endpoints, replication of iNOS→GSNOR→AGT axis\",\n      \"pmids\": [\"23440427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"GSNOR deficiency in mesenchymal stem cells (MSCs) impairs vasculogenesis in vitro and in vivo, associated with downregulation of PDGFRα; pharmacologic NO synthase inhibition (L-NAME) or GHRH agonists restore tube formation by normalizing VEGF-A/PDGFRα signaling.\",\n      \"method\": \"GSNOR-knockout MSCs, Matrigel tube-formation assay, in vivo vasculogenesis model, PDGFR antagonist, L-NAME treatment, GHRH agonists\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with in vitro and in vivo assays and pharmacological rescue, single lab\",\n      \"pmids\": [\"23288904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"GSNOR is itself subject to inhibitory S-nitrosation at conserved non-zinc-coordinating cysteine residues; nitrosation reduces catalytic activity (reversible by DTT), promotes thermal aggregation and increased polydispersity, and alters the shape of substrate/coenzyme binding pockets as shown by HDX-MS. Site-directed mutagenesis of specific cysteines reduces sensitivity to nitrosating agents.\",\n      \"method\": \"In vitro enzyme activity assays with nitrosating agents and DTT reversal, mass spectrometry (nitrosation site identification), site-directed mutagenesis, tryptophan fluorescence, thermal aggregation, hydrogen-deuterium exchange MS (HDX-MS); human, plant, and yeast GSNORs tested\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with mutagenesis, multiple orthogonal methods (MS, HDX-MS, fluorescence, activity assay), cross-species validation\",\n      \"pmids\": [\"27064847\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Increased GSNOR expression in the hippocampus during aging decreases S-nitrosation of CaMKIIα at Cys280/Cys289, reducing its synaptosomal accumulation and downstream p(S831)-GluR1 phosphorylation, causing LTP defects and cognitive impairment; GSNOR knockout rescues these age-related deficits.\",\n      \"method\": \"GSNOR transgenic (neuron-specific overexpression) and knockout mice, Morris water maze/fear conditioning/Y-maze behavioral tests, LTP electrophysiology, synaptosomal fractionation, biotin-switch assay for S-nitrosation, CaMKIIα C280/C289 site-directed mutagenesis\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic gain- and loss-of-function with mutagenesis of S-nitrosation sites, multiple behavioral and biochemical endpoints, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"28883020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GSNOR depletion increases S-nitrosylation of Akt at Cys224, which reduces Akt phosphorylation at Ser473 and suppresses T-cell activation; GSNOR knockout in ApoE-/- mice reduces T-cell-driven atherosclerosis under hyperhomocysteinemia conditions.\",\n      \"method\": \"GSNOR-knockout/ApoE-double-knockout mice, adoptive T-cell transfer, site-directed mutagenesis (Akt C224), biotin-switch for S-nitrosylation, flow cytometry, immunoblot\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with mutagenesis of specific nitrosation site, in vivo adoptive transfer, multiple orthogonal methods\",\n      \"pmids\": [\"29860106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GSNOR allosteric activation by its own substrate GSNO was demonstrated kinetically (Hill coefficient ~1.75); an allosteric GSNO-binding site comprising residues Asn185, Lys188, Gly321, and Lys323 was identified by docking, molecular dynamics, and HDX-MS; K188A and K323A mutations abolish allosteric behavior.\",\n      \"method\": \"Enzyme kinetics (Hill-Langmuir equation), molecular docking, molecular dynamics simulation, HDX-MS, site-directed mutagenesis (K188A, K323A)\",\n      \"journal\": \"Antioxidants (Basel, Switzerland)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetics with mutagenesis and HDX-MS structural validation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"31766125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"nNOS and GSNOR co-localize at the sarcolemma and co-immunoprecipitate in C2C12 myotubes and myofibers; GSNOR expression decreases in mouse models of muscular dystrophy, aging, and ALS, indicating a physical and functional interaction relevant to skeletal muscle homeostasis.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, expression analysis in dystrophic/ALS/aged muscle, C2C12 differentiation model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP interaction confirmed, co-localization by immunofluorescence, multiple disease models, single lab\",\n      \"pmids\": [\"31043586\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GSNOR translation is induced by hydrogen peroxide and mitochondrial ROS via a signaling cascade: redox activation of ATM → phosphorylation of CHK2 and p53 → increased GSNOR protein levels; this ATM/GSNOR axis sustains mitophagy and influences T-cell activation.\",\n      \"method\": \"siRNA knockdown, selective pharmacological inhibitors of ATM/CHK2, immunoblot, flow cytometry (mitophagy markers), redox-insensitive ATM mutant expression\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and genetic (siRNA, ATM mutant) dissection of pathway, single lab, multiple readouts\",\n      \"pmids\": [\"33245190\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Combined deficiency of ADH5 (formaldehyde dehydrogenase) and ALDH2 causes AMeD syndrome; cellular studies showed decreased formaldehyde tolerance underlies loss of hematopoietic stem cell differentiation/proliferation capacity; Adh5 E506K/E506K mice recapitulated dwarfism, short lifespan, and hematopoietic failure.\",\n      \"method\": \"Patient-derived cellular studies, ADH5/ALDH2 double-knockout/knock-in mouse model, hematopoietic stem cell functional assays, formaldehyde exposure experiments\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic syndrome combined with mouse model recapitulation and cellular mechanistic studies, multiple orthogonal approaches\",\n      \"pmids\": [\"33355142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADH5 is the primary cellular defense against formaldehyde (ALDH2 is a backup); ADH5/ALDH2-deficient iPSCs show drastically defective hematopoietic differentiation with increased DNA damage when stimulated, partially reversed by ALDH2 agonist C1; lymphocytes from patients show elevated sister chromatid exchanges reflecting homologous recombination repair of formaldehyde damage.\",\n      \"method\": \"Patient-derived iPSCs, disease model cell lines, hematopoietic differentiation assays, SCE assay, DNA damage markers, ALDH2 agonist (C1) rescue\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — patient-derived models combined with iPSC differentiation assays and pharmacological rescue, multiple cell types and endpoints\",\n      \"pmids\": [\"33512438\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ADH5-mediated denitrosylation regulates brown adipose tissue (BAT) thermogenesis: loss of ADH5 in BAT impairs cold-induced UCP1-dependent thermogenesis and worsens obesity-associated metabolic dysfunction; ADH5 expression in BAT is induced by transcription factor HSF1, and HSF1 activator administration increases ADH5 expression and improves UCP1-mediated respiration.\",\n      \"method\": \"BAT-specific ADH5 knockout mice, cold exposure challenge, UCP1-dependent respiration assay, HSF1 activator pharmacology, ChIP/reporter for HSF1→Adh5 transcription\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with cold challenge and pharmacological rescue, single lab, multiple metabolic endpoints\",\n      \"pmids\": [\"34788615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GSNOR deficiency increases S-nitrosylation of TANK-binding kinase 1 (TBK1) at Cys423, inhibiting TBK1 kinase activity and reducing interferon production, thereby impairing antiviral innate immune responses; GSNOR-deficient mice show higher mortality upon HSV-1 infection.\",\n      \"method\": \"GSNOR-knockout MEFs and macrophages, viral infection assays (HSV-1, VSV), biotin-switch for TBK1 S-nitrosation at Cys423, kinase activity assay, N6022 GSNOR inhibitor, interferon ELISA\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO and pharmacological inhibitor converge, specific nitrosation site identified, kinase activity measured, in vivo mortality endpoint\",\n      \"pmids\": [\"34678655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ADH5/GSNOR deficiency impairs STING-dependent innate immune responses; GSNO (whose catabolism is mediated by ADH5) induces S-nitrosylation of STING at Cys257, inhibiting its binding to cGAMP; ADH5 facilitates STING activation by maintaining low cellular SNO levels.\",\n      \"method\": \"Adh5-knockout mice, viral/bacterial infection models (HSV-1, Listeria), biotin-switch for STING S-nitrosylation at Cys257, cGAMP-binding assay, interferon production measurement\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO, specific nitrosation site identified, direct binding assay, in vivo infection model, multiple orthogonal methods\",\n      \"pmids\": [\"38409248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"GSNOR deficiency induces S-nitrosylation of MAPK14 (p38) at Cys211, increasing MAPK14 kinase activity and promoting NLRP3 inflammasome transcription (Nlrp3, Il-1β); Gsnor-/-Nlrp3-/- double-knockout mice have reduced disease severity in LPS-induced septic shock and DSS-induced colitis models.\",\n      \"method\": \"GSNOR-knockout macrophages, GSNOR/NLRP3 double-knockout mice, biotin-switch for MAPK14 S-nitrosation at Cys211, MAPK14 kinase activity assay, LPS septic shock and DSS colitis in vivo models\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific nitrosation site, kinase activity assay, in vivo epistasis with double KO, multiple disease models\",\n      \"pmids\": [\"38570588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GSNOR deficiency induces S-nitrosylation of focal adhesion kinase 1 (FAK1) at Cys658, enhancing FAK1 autophosphorylation and enabling cancer cells to survive in suspension (anoikis resistance); GSNOR-deficient tumor models are susceptible to FAK1 inhibitors.\",\n      \"method\": \"GSNOR-deficient tumor cell lines and mouse models, biotin-switch/MS for FAK1 S-nitrosation at C658, FAK1 autophosphorylation assay, anoikis resistance assay, FAK1 inhibitor treatment\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific nitrosation site identified, functional autophosphorylation assay, in vivo tumor models, pharmacological validation\",\n      \"pmids\": [\"36656716\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GSNOR is localized in mitochondria (in addition to cytoplasm); mitochondrial GSNOR denitrosylates ANT1 at Cys160, maintaining mitochondrial membrane potential and mitophagy; cardiac-specific GSNOR knockout worsens heart failure, and restoration of mitochondrial GSNOR improves mitochondrial function and cardiac performance.\",\n      \"method\": \"Cellular fractionation, immunofluorescence, colloidal gold staining (electron microscopy), cardiac-specific GSNOR KO mice, AAV9-mitochondria-targeting GSNOR overexpression, biotin-switch + LC-MS/MS for ANT1 S-nitrosation at Cys160, ANT1 C160A mutant, mitochondrial membrane potential assay, transverse aortic constriction HF model\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — novel subcellular localization validated by three methods, specific substrate identified by MS, mutagenesis of S-nitrosation site, in vivo rescue experiment\",\n      \"pmids\": [\"37377022\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK5 S-nitrosation at Cys83 (increased by GSNOR deficiency) inhibits CDK5 kinase activity and CDK5-mediated autophagy; in an MPTP-induced Parkinson's disease mouse model, GSNOR knockout or N6022 inhibitor treatment alleviates CDK5-mediated autophagy and neurotoxicity.\",\n      \"method\": \"GSNOR-knockout mice, MPTP PD model, N6022 GSNOR inhibitor, biotin-switch for CDK5 S-nitrosation at Cys83, CDK5 kinase activity assay, behavioral tests, dopaminergic neuron counting\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific nitrosation site identified, kinase activity assay, genetic and pharmacological convergence, single lab\",\n      \"pmids\": [\"35918012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NEDD4 E3 ubiquitin ligase ubiquitinates and degrades GSNOR under cardiac hypertrophy conditions; NEDD4 expression is elevated in hypertrophic myocardium while GSNOR mRNA remains unchanged; enzyme-dead NEDD4 mutant or non-ubiquitylatable GSNOR mutant decrease GSNOR ubiquitination and inhibit hypertrophic growth; NEDD4-specific inhibitors suppress this axis.\",\n      \"method\": \"Mass spectrometry identification of NEDD4 as E3 ligase, NEDD4 cardiomyocyte-specific KO mice, ubiquitination assays, NEDD4 enzyme-dead mutant and GSNOR non-ubiquitylatable mutant, protein synthesis/degradation inhibitors, in vivo transverse aortic constriction, clinical samples\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — MS identification, genetic KO, mutagenesis of ubiquitination sites, in vivo cardiac model, multiple converging experiments\",\n      \"pmids\": [\"39846173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"S-nitrosylation of GSK3β (increased in GSNOR-deficient iPSCs) reduces GSK3β expression and promotes cardiomyocyte differentiation and maturation from iPSCs; GSNO treatment of wild-type iPSCs phenocopies this effect.\",\n      \"method\": \"GSNOR-knockout iPSCs, directed cardiomyocyte differentiation assay, biotin-switch for GSK3β S-nitrosylation, GSNO treatment, Nkx2.5/Brachyury/GATA4 expression markers\",\n      \"journal\": \"The journal of cardiovascular aging\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO and pharmacological GSNO treatment convergence, specific substrate identified, single lab\",\n      \"pmids\": [\"34790975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NF-κB binds the GSNOR promoter (−88 bp to −73 bp) in response to NGF/TrkA/MEK1-2 signaling, activating GSNOR transcription; in PC12 cells, GSNOR negatively regulates neurite outgrowth—overexpression decreases and knockdown promotes neuronal differentiation.\",\n      \"method\": \"Luciferase reporter assay, EMSA, ChIP, TrkA/MEK inhibitors, GSNOR overexpression and knockdown in PC12 cells, neurite morphometry\",\n      \"journal\": \"Free radical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo promoter occupancy by ChIP, functional gain/loss-of-function, multiple methods, single lab\",\n      \"pmids\": [\"24654711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GSNOR denitrosates Beclin-1 at Cys351; S-nitrosation of Beclin-1 at this site enhances its interaction with ATG14 and increases autophagy, promoting beige-to-white adipocyte conversion during aging; adipose-specific GSNOR overexpression promotes adipose whitening and metabolic decline.\",\n      \"method\": \"GSNOR adipose-specific knock-in and knockout mice, aging cohorts, biotin-switch for Beclin-1 S-nitrosation at Cys351, Beclin-1 C351A mutant, Beclin-1/ATG14 co-immunoprecipitation, mitochondrial content and beige adipocyte quantification\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — specific S-nitrosation site with mutagenesis, binding partner co-IP, conditional KO and KI mouse models, multiple converging endpoints\",\n      \"pmids\": [\"41730881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2033,\n      \"finding\": \"N6022 (GSNOR inhibitor) interferes with the interaction between GSNOR and GSTP1, boosting GSTP1 antioxidant activity and attenuating microglia ferroptosis; GSNOR inhibition also promotes Nrf2 nuclear translocation in cerebral ischemia/reperfusion injury models.\",\n      \"method\": \"OGD/R cell model and MCAO/R mouse model, co-immunoprecipitation (GSNOR–GSTP1 interaction), Nrf2 nuclear fractionation, SLC7A11-GPX4 pathway analysis, infarct volume measurement\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-IP for GSNOR–GSTP1 interaction, in vitro and in vivo models, multiple endpoints, single lab\",\n      \"pmids\": [\"38574838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ADH5 loss in FANCA-deficient keratinocytes causes synthetic lethality and elevates formaldehyde levels and DNA damage markers; ADH5 is the primary formaldehyde defense in keratinocytes, cooperating with ALDH2 and DNA polymerase theta (Polθ); genetic or pharmacological targeting of ADH5 enhances Polθ-inhibitor efficacy in leukemic cells.\",\n      \"method\": \"Systematic CRISPR inactivation of ADH/ALDH genes in FANCA-deficient keratinocyte cell lines, formaldehyde level measurement, DNA damage marker assays, NAC rescue experiment, Polθ inhibitor combination studies\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — systematic genetic screen with functional validation, multiple cell lines, formaldehyde measurement; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.11.13.688345\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"ADH5/GSNOR is a cytoplasmic (and mitochondrial) NADH-dependent denitrosylase that catabolizes S-nitrosoglutathione (GSNO) and formaldehyde-glutathione adducts, thereby controlling cellular S-nitrosylation levels; it denitrosylates specific substrates including ANT1 (Cys160), AGT/MGMT (protecting DNA repair), TBK1 (Cys423, enabling interferon production), STING (Cys257, enabling cGAMP binding), FAK1 (Cys658, suppressing anoikis resistance), CaMKIIα (Cys280/289, supporting synaptic plasticity), Akt (Cys224, modulating T-cell activation), MAPK14 (Cys211, limiting NLRP3 inflammasome), CDK5 (Cys83, limiting autophagy), GSK3β, and Beclin-1 (Cys351, regulating autophagy/adipose remodeling); GSNOR expression is transcriptionally regulated by Sp1 (activated), and repressed by Sp3/Sp4 competition and FBI-1/POZ-domain interaction with Sp1, and induced by NF-κB downstream of NGF, and at the translational level by the ATM→CHK2→p53 redox cascade; GSNOR protein stability is regulated by NEDD4-mediated ubiquitination and proteasomal degradation, and its own catalytic activity is subject to inhibitory S-nitrosation at conserved non-zinc-coordinating cysteines; GSNOR also contains an allosteric GSNO-binding site (Lys188, Lys323) that activates the enzyme at high GSNO concentrations; physiologically, GSNOR loss promotes hepatocarcinogenesis via AGT depletion, impairs antiviral immunity, exacerbates cardiac hypertrophy/failure, causes hematopoietic stem cell failure when combined with ALDH2 deficiency (AMeD syndrome), and disrupts skeletal muscle, adipose, and neuronal homeostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ADH5 (also called GSNOR, chi-ADH/FDH) is a ubiquitously expressed, NADH-dependent enzyme that serves as the master controller of cellular S-nitrosylation and as the primary cellular defense against formaldehyde, catabolizing S-nitrosoglutathione (GSNO) and formaldehyde-glutathione adducts to govern the nitrosative and aldehyde load across many tissues [#3, #13]. As a denitrosylase, ADH5 limits the S-nitrosation of a broad substrate set, and its loss therefore drives substrate-specific gain or loss of function: it protects the DNA-repair protein AGT/MGMT from S-nitrosylation-driven degradation, with iNOS acting upstream so that hepatocyte-specific loss promotes O6-alkylguanine accumulation, DNA double-strand breaks, and hepatocarcinogenesis [#3, #4, #5]. The same denitrosylase logic tunes innate immunity and inflammation—ADH5 keeps TBK1 (Cys423) and STING (Cys257) free of inhibitory S-nitrosation to permit interferon production [#16, #17], while restraining MAPK14 (Cys211)-driven NLRP3 inflammasome activation [#18]—and modulates kinase signaling on Akt (Cys224) in T cells [#9], FAK1 (Cys658) in anoikis resistance [#19], CaMKII\\u03b1 (Cys280/289) in synaptic plasticity [#8], and CDK5 (Cys83) in autophagy [#21]. A mitochondrial pool of ADH5 denitrosylates ANT1 (Cys160) to preserve membrane potential and protect against heart failure [#20], and it denitrosylates Beclin-1 (Cys351) to limit autophagy-driven adipose remodeling [#25]. ADH5 expression is activated by Sp1 and repressed by Sp3/Sp4 competition and by FBI-1/POZ-domain sequestration of Sp1 [#1, #2], induced via NF-\\u03baB downstream of NGF [#24] and by an ATM\\u2192CHK2\\u2192p53 redox cascade [#12], and its protein level is set by NEDD4-mediated ubiquitination and degradation [#22]; the enzyme is itself feedback-regulated by inhibitory S-nitrosation of non-zinc-coordinating cysteines and by allosteric activation through a GSNO-binding site (Lys188, Lys323) [#7, #10]. Combined deficiency of ADH5 and ALDH2 causes AMeD syndrome, in which impaired formaldehyde clearance drives hematopoietic stem cell failure, dwarfism, and DNA damage [#13, #14].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established the genomic architecture and ubiquitous-expression promoter of ADH5, providing the foundation for understanding its broad tissue distribution.\",\n      \"evidence\": \"Genomic cloning, primer extension, and CAT reporter assay in CV-1 cells\",\n      \"pmids\": [\"1446828\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not identify the trans-acting factors driving the promoter\", \"No link yet to enzymatic function\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined how ADH5 transcription is set by competing GC-box factors, showing Sp1 activates and Sp3/Sp4 and FBI-1 repress via interference with Sp1 binding.\",\n      \"evidence\": \"Cis-element mutagenesis, EMSA, and reporter assays in SL2 cells (1999); GST pulldown, ChIP, and DNase I footprinting for FBI-1\\u2013Sp1 (2002)\",\n      \"pmids\": [\"9867805\", \"12004059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish how these inputs respond to nitrosative or metabolic state\", \"Physiological contexts that engage each factor unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked ADH5/GSNOR loss to cancer by showing it protects the DNA-repair enzyme AGT/MGMT from iNOS-driven S-nitrosylation and degradation, placing iNOS upstream of GSNOR-controlled hepatocarcinogenesis.\",\n      \"evidence\": \"GSNOR-knockout, hepatocyte-specific conditional KO, and iNOS double-KO/inhibitor mouse studies with AGT immunoblot, DNA-adduct, and tumor endpoints\",\n      \"pmids\": [\"20371487\", \"21385828\", \"23440427\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the full set of repair-relevant denitrosylation substrates\", \"Cell-autonomous vs systemic contributions not fully separated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Revealed that GSNOR is autoregulated, with inhibitory S-nitrosation of non-zinc cysteines reducing catalytic activity and altering binding-pocket conformation, establishing feedback control of the denitrosylase by its own product.\",\n      \"evidence\": \"In vitro activity assays with DTT reversal, MS, HDX-MS, fluorescence, and site-directed mutagenesis across human, plant, and yeast enzymes\",\n      \"pmids\": [\"27064847\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo significance of inhibitory nitrosation under physiological NO flux not quantified\", \"Interplay with allosteric activation not resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended GSNOR's denitrosylase role to the brain, showing it controls CaMKII\\u03b1 (Cys280/289) S-nitrosation, synaptic accumulation, and LTP, with age-related overexpression causing cognitive decline.\",\n      \"evidence\": \"Neuron-specific transgenic and knockout mice, behavioral testing, LTP electrophysiology, biotin-switch, and CaMKII\\u03b1 site mutagenesis\",\n      \"pmids\": [\"28883020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Drivers of age-related GSNOR upregulation in hippocampus unspecified\", \"Effect on other neuronal substrates not assessed\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided the kinetic and structural basis for GSNOR's positive feedback, identifying an allosteric GSNO-binding site (Lys188, Lys323) that activates the enzyme at high substrate concentrations.\",\n      \"evidence\": \"Enzyme kinetics (Hill analysis), docking, molecular dynamics, HDX-MS, and K188A/K323A mutagenesis\",\n      \"pmids\": [\"31766125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Allosteric site occupancy under cellular GSNO levels not measured\", \"Crosstalk with inhibitory cysteine nitrosation unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined ADH5 as the primary formaldehyde defense whose combined loss with ALDH2 causes AMeD syndrome, linking aldehyde clearance to hematopoietic stem cell maintenance and genome stability.\",\n      \"evidence\": \"Patient-derived cells and iPSCs, ADH5/ALDH2 double-KO/knock-in mice, hematopoietic differentiation, SCE and DNA-damage assays, and ALDH2 agonist rescue\",\n      \"pmids\": [\"33355142\", \"33512438\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative tissue thresholds for formaldehyde toxicity not fully mapped\", \"Connection between formaldehyde and denitrosylase functions of ADH5 not integrated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed GSNOR coordinates antiviral and inflammatory signaling by keeping TBK1 (Cys423), STING (Cys257), and MAPK14 (Cys211) appropriately denitrosylated, balancing interferon production against NLRP3 inflammasome activation.\",\n      \"evidence\": \"Knockout MEFs/macrophages, viral and bacterial infection models, biotin-switch site mapping, kinase and cGAMP-binding assays, and double-knockout epistasis\",\n      \"pmids\": [\"34678655\", \"38409248\", \"38570588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stimulus-specific control of which substrate dominates not resolved\", \"Spatial coupling of GSNOR to immune signaling complexes unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified a mitochondrial pool of GSNOR that denitrosylates ANT1 (Cys160) to preserve membrane potential and protect the heart, expanding the enzyme's role beyond the cytoplasm.\",\n      \"evidence\": \"Cell fractionation, immunofluorescence, immuno-EM, cardiac-specific KO and mitochondria-targeted AAV9 rescue, MS site mapping, and ANT1 C160A mutant\",\n      \"pmids\": [\"37377022\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mitochondrial import not defined\", \"Full mitochondrial substrate repertoire unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established that GSNOR protein levels are controlled post-translationally by NEDD4-mediated ubiquitination, providing a degradation switch that drives cardiac hypertrophy when GSNOR is lost.\",\n      \"evidence\": \"MS identification of NEDD4, cardiomyocyte-specific NEDD4 KO, ubiquitination assays, enzyme-dead and non-ubiquitylatable mutants, TAC model, and clinical samples\",\n      \"pmids\": [\"39846173\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals activating NEDD4 toward GSNOR not fully defined\", \"Interaction with transcriptional and translational regulation not integrated\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Connected GSNOR denitrosylase activity to autophagy-driven adipose aging by showing it denitrosylates Beclin-1 (Cys351) to limit Beclin-1\\u2013ATG14 interaction and beige-to-white adipocyte conversion.\",\n      \"evidence\": \"Adipose-specific knock-in and knockout mice, aging cohorts, biotin-switch, Beclin-1 C351A mutant, and Beclin-1/ATG14 co-IP\",\n      \"pmids\": [\"41730881\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of Beclin-1 control across autophagy contexts unknown\", \"Relationship to CDK5-mediated autophagy regulation not reconciled\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ADH5's formaldehyde-clearance and protein-denitrosylase functions are coordinated within a single tissue, and what determines substrate selectivity among its many reported targets, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking aldehyde detoxification and S-nitrosylation control\", \"Substrate selection rules for denitrosylation not defined\", \"Spatial organization of cytoplasmic vs mitochondrial pools relative to substrates incompletely mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [13, 14]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [3, 16, 17, 20, 25]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [16, 17, 18, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [16, 17, 18]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [3, 4, 14]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [7, 12, 16, 17]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [21, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 2, 24]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [13, 14, 15]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"NEDD4\", \"GSTP1\", \"nNOS\", \"ATG14\", \"Sp1\", \"FBI-1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}