{"gene":"SOD2","run_date":"2026-06-10T07:46:38","timeline":{"discoveries":[{"year":2002,"finding":"SOD2 (MnSOD) is a manganese-containing homotetramer that is synthesized with a mitochondrial leader peptide targeting it exclusively to the mitochondrial matrix, where it catalyzes the dismutation of superoxide anions to hydrogen peroxide.","method":"Molecular characterization, gene structure analysis, biochemical characterization","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical reconstitution and molecular characterization replicated across multiple studies; foundational enzymatic activity and localization established","pmids":["12126755"],"is_preprint":false},{"year":1995,"finding":"TNF-R1 (but not TNF-R2) mediates TNF/LT-induced MnSOD expression, and MnSOD protection against radiation requires its mitochondrial localization — insertion of the mitochondrial signal sequence into CuZn-SOD or EC-SOD confers radiation protection, whereas MnSOD lacking the mitochondrial signal does not protect.","method":"Receptor-specific overexpression, signal peptide swap experiments, radiation survival assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic/molecular dissection with receptor knockout and signal peptide experiments, single lab","pmids":["7599209"],"is_preprint":false},{"year":2005,"finding":"MnSOD overexpression inhibits proline oxidase (POX)-induced apoptosis in colorectal cancer cells by dramatically reducing cytochrome c release from mitochondria; the protective effect operates through scavenging superoxide radicals generated by POX, converting them to H2O2.","method":"Adenoviral overexpression of MnSOD in DLD-1 cells with inducible POX, cytochrome c release assay, ROS measurement","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean overexpression with defined phenotypic readout (cytochrome c release), single lab","pmids":["15817612"],"is_preprint":false},{"year":2005,"finding":"MnSOD overexpression produces a tumor-suppressive effect mediated primarily by the hydrogen peroxide generated from superoxide dismutation, as both catalase and glutathione peroxidase modulate the growth-inhibitory effect.","method":"Overexpression studies with antioxidant enzyme co-expression, growth inhibition assays across cancer cell lines","journal":"Biomedicine & pharmacotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple cell line experiments with enzymatic modulation, single review synthesizing experimental data","pmids":["15862707"],"is_preprint":false},{"year":2011,"finding":"MnSOD enzymatic activity is regulated by reversible acetylation of specific evolutionarily conserved lysines; SIRT3 deacetylates these lysines in response to changes in mitochondrial nutrient/redox status, enhancing MnSOD activity.","method":"Acetylation assays, SIRT3 overexpression/knockdown, enzymatic activity measurements","journal":"Aging","confidence":"High","confidence_rationale":"Tier 1 / Strong — post-translational modification with identified writer (SIRT3), enzymatic activity readout, replicated across multiple subsequent studies","pmids":["21386137"],"is_preprint":false},{"year":2011,"finding":"USP36 is a deubiquitinating enzyme that interacts with SOD2 (confirmed by co-IP and yeast two-hybrid), reduces its polyubiquitination, and extends its half-life, thereby regulating SOD2 protein stability through the ubiquitin-proteasomal pathway.","method":"2-DE/MALDI-TOF/MS identification, co-immunoprecipitation, yeast two-hybrid, ubiquitination assay, half-life measurement","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus yeast two-hybrid with functional ubiquitination assay, single lab","pmids":["21268071"],"is_preprint":false},{"year":2013,"finding":"SIRT3 directly deacetylates MnSOD at specific lysine residues to activate its enzymatic dismutase activity; loss of SIRT3 function leads to MnSOD hyperacetylation and reduced ROS scavenging, creating a tumor-permissive phenotype.","method":"Deacetylation assays, SIRT3 knockdown/knockout models, enzymatic activity measurements","journal":"Antioxidants & redox signaling","confidence":"High","confidence_rationale":"Tier 1 / Strong — enzymatic mechanism established with identified writer (SIRT3), replicated across multiple labs and studies","pmids":["23886445"],"is_preprint":false},{"year":2015,"finding":"MnSOD upregulation in cancer cells establishes a steady mitochondrial H2O2 flow that activates AMPK and drives metabolic shift to glycolysis (Warburg effect); restricting MnSOD expression or inhibiting AMPK suppresses this metabolic switch.","method":"MnSOD overexpression/knockdown in cancer cells, AMPK activity assays, metabolic flux measurements, xenograft models","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic manipulation with multiple orthogonal metabolic readouts, in vitro and in vivo validation","pmids":["25651975"],"is_preprint":false},{"year":2015,"finding":"CDK4 translocates to mitochondria under low-dose ionizing radiation and directly phosphorylates MnSOD at serine-106 (S106), enhancing its enzymatic activity and mitochondrial respiration; mitochondria-targeted dominant-negative CDK4 or MnSOD-S106 mutant reverses this adaptive protection.","method":"Mitochondrial fractionation, in vitro kinase assay, site-directed mutagenesis, dominant-negative CDK4 constructs, enzymatic activity measurements","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct phosphorylation demonstrated by in vitro kinase assay with mutagenesis validation, confirmed in vivo in mouse skin","pmids":["25578653"],"is_preprint":false},{"year":2015,"finding":"SIRT3 deacetylates SOD2 at K68 to enhance its activity during osteoblast differentiation; SIRT3 expression increases during differentiation and SOD2 knockdown suppresses differentiation, while SOD2 overexpression rescues osteoblast differentiation in SIRT3-deficient mice.","method":"SIRT3/SOD2 knockdown, K68 deacetylation assay, osteoblast differentiation assays, SIRT3-knockout mouse model","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific deacetylation at K68 with in vivo mouse model rescue, replicated across cell and animal systems","pmids":["28914882"],"is_preprint":false},{"year":2016,"finding":"Sirt3 depletion increases SOD2 acetylation, elevates mitochondrial superoxide, and diminishes endothelial nitric oxide; angiotensin II-induced hypertension involves Sirt3 S-glutathionylation, vascular SOD2 hyperacetylation, and reduced SOD2 activity. SOD2 acetylation inversely correlates with SOD2 activity.","method":"Sirt3-knockout and SOD2+/- mouse models, angiotensin II hypertension model, acetylation assays, SOD2 activity measurements, mitochondria-targeted antioxidant rescue","journal":"Circulation research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic mouse models with pharmacological rescue, validated in human hypertensive subjects","pmids":["28684630"],"is_preprint":false},{"year":2016,"finding":"Sirt3 deacetylates K68 of SOD2 to reduce mitochondrial ROS and suppress osteoclastogenesis; Sirt3-targeted siRNA decreases SOD2 deacetylation at K68, increasing osteoclast differentiation. In vivo knockdown of SOD2 or Sirt3 in mouse calvaria decreases bone volume and increases osteoclast surface.","method":"siRNA knockdown, site-specific deacetylation assay (K68), in vivo calvaria injection, bone volume measurements","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — site-specific K68 deacetylation confirmed with in vitro and in vivo validation, two orthogonal genetic approaches","pmids":["27540894"],"is_preprint":false},{"year":2019,"finding":"Acetylation of MnSOD at lysine 68 (K68-Ac) shifts its quaternary structure from a homotetramer (superoxide dismutase activity) to a monomer that functions as a peroxidase; MnSOD-K68Q (acetylation mimic) acts as a tumor promoter in transformation assays and confers tamoxifen resistance in breast cancer cells.","method":"K68Q acetylation-mimic mutation, in vitro transformation assay, xenograft growth assay, biochemical peroxidase activity assay, gel filtration/native PAGE for oligomeric state, physically acetylated K68-Ac protein analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with acetylation-mimic and physically acetylated protein, multiple orthogonal biochemical and cellular assays in single rigorous study","pmids":["31160585"],"is_preprint":false},{"year":2019,"finding":"SOD2 K68 acetylation promotes breast cancer cell stemness by increasing mitochondrial ROS (mtROS), which stabilize HIF2α, activating stemness genes (Oct4, Sox2, Nanog).","method":"K68 acetylation analysis, mtROS measurement, HIF2α stabilization assay, stemness gene expression, breast cancer cell models","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway dissection with multiple readouts, single lab","pmids":["31591207"],"is_preprint":false},{"year":2021,"finding":"MnSOD-K68 acetylation mimic (MnSOD-K68Q) leads to cisplatin and doxorubicin resistance, shifts MnSOD to monomeric form, alters mitochondrial morphology and metabolism; the monomer appears to incorporate Fe to maximally induce peroxidase activity, with conformational change adjacent to Mn2+ binding site destabilizing the tetramer.","method":"Acetylation-mimic mutation, drug resistance assays, molecular dynamics simulation, biochemical peroxidase activity, mitochondrial structural analysis","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis with in vitro functional assays and computational structural analysis, single lab","pmids":["33867840"],"is_preprint":false},{"year":2011,"finding":"MnSOD upregulation in senescent keratinocytes produces H2O2 overproduction that drives autophagic cell death; overexpression of MnSOD or exogenous H2O2 reproduces the autophagic death, which is blocked by catalase treatment or autophagy inhibitors (3-methyladenine, anti-Atg5 siRNA).","method":"MnSOD overexpression, catalase rescue, autophagy inhibition (3-MA, Atg5 siRNA), lysotracker staining, LC3 vesiculation, TEM","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal autophagy readouts with genetic and pharmacological rescue, single lab","pmids":["20856861"],"is_preprint":false},{"year":2015,"finding":"SIRT3 depletion reduces SOD2 activity by promoting acetylation, leading to elevated mitochondrial O2•- and hepatotoxicity; a catalytically inactive SIRT3 mutant (SIRT3-H248Y) loses the capacity to suppress cadmium-induced autophagy, confirming deacetylase activity is required.","method":"SIRT3 overexpression with catalytic mutant (H248Y), SOD2 acetylation assay, mitochondrial O2•- measurement, autophagy assay in HepG2 cells and in vivo","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 1 / Strong — catalytic mutant controls establish deacetylase-dependency, confirmed in vivo, multiple orthogonal readouts","pmids":["26120888"],"is_preprint":false},{"year":2006,"finding":"C/EBPβ is required for TNF-induced MnSOD expression and protection against TNF-induced apoptosis; mechanistically, C/EBPβ is required for NF-κB p65 binding to MnSOD's intronic TNF response element and for histone acetylation of that element in response to TNF.","method":"C/EBPβ-deficient fibroblasts, ectopic C/EBPβ expression, MnSOD stable transfection rescue, ChIP for NF-κB binding and histone acetylation","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP assay with genetic rescue experiments, single lab","pmids":["16850160"],"is_preprint":false},{"year":2012,"finding":"Intact TNF signaling (via TNFR1/R2) is required for low-dose ionizing radiation to induce elevated MnSOD activity and SOD2-mediated adaptive responses; amifostine (via its thiol WR1065) can directly activate NF-κB to elevate SOD2 activity independent of TNF receptors. SOD2 siRNA completely abolishes both SOD2 activity elevation and adaptive responses.","method":"TNFR1/R2 knockout cells and mice, SOD2 siRNA, micronucleus assay, SOD2 activity measurement","journal":"Radiation research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with knockout cells and mice, siRNA knockdown, confirmed in vivo","pmids":["23237540"],"is_preprint":false},{"year":2015,"finding":"SOD2 knockdown in human cells (CRISPR/Cas9 complete null) impairs mitochondrial bioenergetics; SOD2-null cells prefer glycolysis over oxidative phosphorylation and show impaired mitochondrial complex I and II activities (from disruption of Fe/S centers), with perturbed mitochondrial ultrastructure.","method":"CRISPR/Cas9 biallelic SOD2 knockout in HEK293T cells, mitochondrial bioenergetics assay, complex I/II activity, electron microscopy","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — complete genetic null with multiple orthogonal metabolic and structural readouts, pharmacological rescue with SOD mimetic","pmids":["26208779"],"is_preprint":false},{"year":2019,"finding":"Manganese influx via ZIP8 transporter is essential for SOD2 activity in skeletal myoblasts; ZIP8 knockdown impairs Mn-dependent SOD2 activity and can be partially rescued by Mn supplementation, demonstrating that ZIP8-mediated Mn delivery is required for SOD2 metalloenzyme function.","method":"ZIP8 siRNA knockdown, Mn supplementation rescue, SOD2 activity assay, ICP-MS metal quantification, cell differentiation assays","journal":"Metallomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with ion supplementation rescue and enzymatic activity readout, single lab","pmids":["31086870"],"is_preprint":false},{"year":2019,"finding":"Mutant p53 induces SIRT3 expression, which deacetylates MnSOD to enhance its enzymatic activity; SIRT3 restoration reverses MnSOD activity decrease caused by mutant p53 knockdown. MnSOD knockdown further enhances mutant p53-mediated ROS increase and counteracts cell hyperproliferation.","method":"p53 mutant cell lines, qPCR, immunoblotting, enzyme activity assay, SIRT3 overexpression rescue, ROS assay after transfection","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue experiments with enzymatic activity readout, single lab, multiple orthogonal approaches","pmids":["31812668"],"is_preprint":false},{"year":2020,"finding":"Caffeine binds SIRT3 with high affinity (KD = 6.858×10⁻⁷ M) and promotes SIRT3-substrate binding, enhancing SIRT3 deacetylase activity toward SOD2, thereby reducing SOD2 acetylation and increasing SOD2 enzymatic activity. The SIRT3 inhibitor 3-TYP reverses caffeine-induced SOD2 activation.","method":"Binding affinity assay, SIRT3 enzyme activity assay, SOD2 acetylation measurement, 3-TYP inhibitor control, in vitro and in vivo models","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — binding affinity measured, enzymatic assay with pharmacological inhibitor controls, single lab","pmids":["33015038"],"is_preprint":false},{"year":2019,"finding":"A homozygous missense variant (p.Gly181Val) in SOD2 causes lethal neonatal dilated cardiomyopathy; patient fibroblasts show significantly increased superoxide levels and reduced SOD2 catalytic activity; lentiviral complementation with wild-type SOD2 completely restores mitochondrial SOD2 activity.","method":"Exome sequencing, hydroethidine oxidation assay for O2•-, SOD2 activity assay in patient fibroblasts and muscle, lentiviral wild-type SOD2 complementation","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct enzymatic activity measurement in patient cells with genetic complementation rescue, multiple orthogonal validations","pmids":["31494578"],"is_preprint":false},{"year":2022,"finding":"HuR (ELAVL1) RNA-binding protein accumulates in the cytosol upon anchorage-independence and binds SOD2 mRNA, promoting increased association with heavy polyribosomes and nascent SOD2 protein synthesis. p38 MAPK activation is necessary for HuR-SOD2 mRNA interactions and induction of SOD2 protein output in detached cells.","method":"Polyribosome profiling, HuR siRNA knockdown, RIP assay, p38 inhibition, nascent protein synthesis assay","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP assay plus polyribosome profiling with siRNA knockdown, single lab with multiple orthogonal methods","pmids":["35594792"],"is_preprint":false},{"year":2007,"finding":"SOD2 knockdown in RPE cells via AAV-delivered ribozyme reduces MnSOD protein, increases superoxide, causes oxidative protein damage, progressive loss of electroretinograph response, RPE degeneration, Bruch's membrane thickening, and photoreceptor apoptosis — establishing SOD2 as essential for RPE and retinal function.","method":"AAV-delivered ribozyme knockdown of MnSOD in mouse retina, ERG, immunoblot, LC-MS/MS oxidative damage markers, light/electron microscopy","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic knockdown with multiple orthogonal structural and functional readouts","pmids":["17898259"],"is_preprint":false},{"year":2010,"finding":"MnSOD overexpression in LNCaP prostate cancer cells induces neuroendocrine (NE) differentiation features including synaptophysin expression, androgen independence, Bcl-2 upregulation, and prevention of docetaxel/etoposide/TNF-induced cell death; the effects are linked to reduced superoxide and elevated H2O2 levels.","method":"Stable MnSOD-overexpressing LNCaP clones, NE marker expression (synaptophysin), androgen receptor localization, apoptosis assays with multiple chemotherapeutics, ROS measurement","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular phenotype with multiple markers in stable overexpression model, single lab","pmids":["21056653"],"is_preprint":false},{"year":2020,"finding":"SOD2 drives glycolysis via H2O2-mediated AMPK activation in colorectal cancer; proper SOD2 levels maintain mitochondrial function by superoxide disposal, while overexpression induces H2O2-mediated AMPK upregulation and glycolysis.","method":"SOD2 knockdown in CRC cell lines, mitochondrial function assays, AMPK activation measurement, glycolysis measurement, proliferation/migration/invasion assays","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with metabolic pathway dissection, single lab","pmids":["32149414"],"is_preprint":false},{"year":2017,"finding":"SOD2 expression is transcriptionally upregulated during TGF-β-induced EMT by NF-κB and ZEB2 (but not ZEB1); SOD2-mediated antioxidant activity restricts early conversion of CD44L epithelial cells to CD44H mesenchymal cells and suppresses TGF-β-mediated ROS induction and senescence.","method":"Genetically engineered cell lines, RNAi knockdown, flow cytometry for CD44 subpopulations, TGF-β stimulation, transcription factor pathway analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined pathway placement with transcription factor specificity (ZEB2 vs ZEB1) and functional EMT readouts, single lab","pmids":["25659582"],"is_preprint":false},{"year":2014,"finding":"Angiotensin II inhibits SIRT1 in osteoblasts, leading to hyperacetylation of FoxO3a, which reduces expression of MnSOD and catalase, causing mitochondrial oxidative stress and mtDNA damage; SIRT1 activator (SRT3025) or MnSOD mimetic (MnTBAP) rescue these effects.","method":"Angiotensin II treatment of osteoblasts, SIRT1/SIRT3 protein level analysis, FoxO3a acetylation assay, MnSOD mRNA/protein measurement, pharmacological rescue","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway epistasis with pharmacological rescue, SIRT1 specificity over SIRT3 established, single lab","pmids":["25450701"],"is_preprint":false},{"year":2020,"finding":"SOD2 deficiency-induced oxidative stress in granulosa cells decreases progesterone and estradiol production by reducing StAR protein gene expression, key steroidogenic enzyme genes, and impairing cholesterol transport from cytosol to mitochondria.","method":"Sod2+/- mouse model, granulosa cell isolation, steroid hormone measurement, qRT-PCR for StAR and steroidogenic enzymes, lipid peroxidation assay","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo genetic model with defined molecular mechanism (cholesterol transport and gene expression), single lab","pmids":["32717420"],"is_preprint":false},{"year":2020,"finding":"SOD2 knockdown in periodontitis cells leads to increased NLRP3 inflammasome component production; SOD2 is upregulated through the NF-κB pathway and exerts a protective role by suppressing the NLRP3 inflammasome-caspase-1-IL-1β axis.","method":"CRISPR/Cas9 SOD2 knockout, immunoblot for NLRP3 components, NF-κB pathway analysis","journal":"Oral diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR knockout with defined inflammasome pathway readout, single lab","pmids":["29972711"],"is_preprint":false},{"year":2020,"finding":"IT (IFN-γ + TNF-α) cytokine stimulation upregulates SOD2 in MSCs, decreasing mitochondrial ROS; SOD2 knockdown leads to enhanced adipogenic differentiation but reduced immunosuppression; SOD2-dependent suppression of mtROS inhibits PGC-1α expression and mitochondrial biogenesis while promoting glycolysis.","method":"SOD2 knockdown in human adipose-MSCs, adipogenic differentiation assay, immunosuppression co-culture assay, mtROS measurement, PGC-1α expression, DSS colitis mouse model","journal":"Molecular therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockdown with multiple orthogonal differentiation and immunological readouts, confirmed in vivo","pmids":["38310354"],"is_preprint":false},{"year":2023,"finding":"Mitochondrial Sod2 genetically interacts with the DNA helicase Sgs1 to suppress nuclear chromosomal rearrangements under oxidative stress; PQ-induced chromosome rearrangements in the absence of Sod2 are promoted by Rad51 recombinase and the polymerase subunit Pol32, and depend on Rev1/Pol ζ translesion synthesis.","method":"Genetic epistasis in yeast (sod2Δ sgs1Δ double mutant), paraquat-induced oxidative stress, chromosomal rearrangement reporter assay, Rad51/Pol32/Rev1 epistasis","journal":"Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with multiple deletion combinations and defined chromosomal rearrangement readout, single lab (yeast ortholog study)","pmids":["37638880"],"is_preprint":false}],"current_model":"SOD2 (MnSOD) is a mitochondria-targeted manganese-containing homotetramer that dismutates superoxide to H2O2; its enzymatic activity is bidirectionally regulated by post-translational modifications — SIRT3-mediated deacetylation at K68 (and K122) activates it, while acetylation at K68 by unknown acetyltransferases shifts the tetramer to a monomeric peroxidase form that promotes tumor progression and drug resistance — and by CDK4-mediated phosphorylation at S106, which enhances activity during adaptive stress responses; protein stability is controlled by USP36 deubiquitination; upstream transcriptional activation requires NF-κB/C/EBPβ, Nrf2, and SIRT1-FoxO3a signaling axes; and downstream, SOD2-generated H2O2 activates AMPK to drive metabolic reprogramming toward glycolysis, stabilizes HIF2α to promote stemness, and modulates inflammasome and apoptotic signaling, collectively explaining SOD2's dual tumor-suppressive and tumor-promoting roles depending on its acetylation state and cellular context."},"narrative":{"mechanistic_narrative":"SOD2 (MnSOD) is a manganese-dependent homotetramer synthesized with a cleavable mitochondrial leader peptide that targets it exclusively to the mitochondrial matrix, where it dismutates superoxide to hydrogen peroxide and thereby governs mitochondrial redox homeostasis [PMID:12126755]. Its metalloenzyme function depends on ZIP8-mediated manganese delivery [PMID:31086870], and complete loss of activity disrupts Fe/S-dependent respiratory complexes I and II, shifts cells toward glycolysis, and perturbs mitochondrial ultrastructure [PMID:26208779]; a homozygous p.Gly181Val variant that abolishes catalytic activity causes lethal neonatal dilated cardiomyopathy, with wild-type complementation restoring activity in patient cells [PMID:31494578]. SOD2 activity is bidirectionally tuned by post-translational modification: SIRT3 deacetylates conserved lysines including K68 to activate the dismutase, and loss of SIRT3 produces hyperacetylation, elevated superoxide, and tissue dysfunction across bone, vascular, and hepatic contexts [PMID:21386137, PMID:23886445, PMID:28914882, PMID:28684630, PMID:26120888]; CDK4 translocating to mitochondria under low-dose radiation phosphorylates S106 to enhance activity during adaptive stress responses [PMID:25578653]; and USP36 deubiquitination stabilizes the protein and extends its half-life [PMID:21268071]. Acetylation at K68 also remodels SOD2's quaternary structure, converting the dismutase tetramer into a monomeric peroxidase that promotes transformation, stemness via HIF2α stabilization, and chemoresistance [PMID:31160585, PMID:31591207, PMID:33867840]. The H2O2 product is itself a signaling output: SOD2-derived H2O2 activates AMPK to drive a glycolytic (Warburg) shift [PMID:25651975, PMID:32149414], suppresses the NLRP3 inflammasome [PMID:29972711], and at high flux drives autophagic cell death [PMID:20856861], explaining SOD2's context-dependent tumor-suppressive and tumor-promoting roles. Transcriptional induction proceeds through NF-κB/C/EBPβ acting at an intronic TNF response element [PMID:16850160], ZEB2 during TGF-β-driven EMT [PMID:25659582], and SIRT1–FoxO3a signaling [PMID:25450701], while HuR/p38 MAPK provides translational control under anchorage independence [PMID:35594792].","teleology":[{"year":2002,"claim":"Established the foundational identity of SOD2 as a Mn-containing matrix homotetramer that converts superoxide to H2O2, defining the enzymatic and compartmental basis for all subsequent function.","evidence":"Molecular and biochemical characterization, gene structure analysis","pmids":["12126755"],"confidence":"High","gaps":["Does not address regulation of activity","Does not connect enzyme output to downstream signaling"]},{"year":1995,"claim":"Resolved whether SOD2's protective function depends on its location by showing mitochondrial targeting is necessary and sufficient for radiation protection, and placed SOD2 induction downstream of TNF-R1.","evidence":"Receptor-specific overexpression and signal peptide swap with radiation survival assays","pmids":["7599209"],"confidence":"Medium","gaps":["Single lab","Does not define the transcriptional machinery linking TNF-R1 to SOD2"]},{"year":2006,"claim":"Defined the transcriptional logic of TNF-induced SOD2 expression by showing C/EBPβ enables NF-κB p65 binding and histone acetylation at an intronic TNF response element.","evidence":"C/EBPβ-deficient fibroblasts with ChIP and MnSOD rescue","pmids":["16850160"],"confidence":"Medium","gaps":["Single lab","Does not address other inducers (Nrf2, FoxO3a)"]},{"year":2005,"claim":"Showed that SOD2's growth-inhibitory and anti-apoptotic effects are mediated by its H2O2 product rather than superoxide removal alone, establishing the enzyme product as the functional effector.","evidence":"Adenoviral/stable overexpression with catalase and GPx co-expression, cytochrome c release and growth assays","pmids":["15817612","15862707"],"confidence":"Medium","gaps":["Overexpression contexts may not reflect endogenous flux","Single-lab readouts"]},{"year":2011,"claim":"Identified reversible acetylation as the principal switch on SOD2 activity and named SIRT3 as the deacetylase that activates the enzyme in response to mitochondrial nutrient/redox state.","evidence":"Acetylation assays with SIRT3 gain/loss and enzymatic activity measurement","pmids":["21386137"],"confidence":"High","gaps":["Did not pinpoint individual lysines","Acetyltransferase writer not identified"]},{"year":2011,"claim":"Established protein-stability control of SOD2 by identifying USP36 as a deubiquitinase that binds SOD2 and extends its half-life.","evidence":"MS identification, reciprocal co-IP, yeast two-hybrid, ubiquitination and half-life assays","pmids":["21268071"],"confidence":"Medium","gaps":["Cognate E3 ligase not identified","Single lab"]},{"year":2013,"claim":"Consolidated the SIRT3–SOD2 axis by showing direct site-specific deacetylation activates dismutase activity and that SIRT3 loss creates a tumor-permissive, hyperacetylated, ROS-rich state.","evidence":"Deacetylation assays with SIRT3 knockdown/knockout and activity measurement","pmids":["23886445"],"confidence":"High","gaps":["Acetyltransferase still unidentified","Tissue-specific consequences not yet mapped"]},{"year":2015,"claim":"Demonstrated a second activating modification by showing CDK4 enters mitochondria after low-dose radiation and phosphorylates S106 to boost activity and respiration during adaptive protection.","evidence":"Mitochondrial fractionation, in vitro kinase assay, S106 mutagenesis, dominant-negative CDK4, in vivo mouse skin","pmids":["25578653"],"confidence":"High","gaps":["Phosphatase reversing S106 unknown","Crosstalk with acetylation not defined"]},{"year":2015,"claim":"Localized SIRT3-mediated activation to K68 and proved its physiological importance in osteoblast differentiation via in vivo rescue in SIRT3-deficient mice.","evidence":"K68 deacetylation assay, SIRT3/SOD2 knockdown, osteoblast differentiation, SIRT3-KO mouse rescue","pmids":["28914882"],"confidence":"High","gaps":["Other regulated lysines (K122) not addressed here","Does not address tumor contexts"]},{"year":2015,"claim":"Defined a downstream signaling role by showing SOD2-derived H2O2 activates AMPK to drive a glycolytic Warburg shift in cancer cells.","evidence":"Reciprocal SOD2 manipulation, AMPK and metabolic flux assays, xenografts","pmids":["25651975"],"confidence":"High","gaps":["Direct H2O2 target on the AMPK pathway not identified","Threshold separating protective vs pro-tumor flux unclear"]},{"year":2015,"claim":"Showed that SIRT3 deacetylase activity is mechanistically required for SOD2-dependent control of mitochondrial superoxide and stress-induced autophagy, using a catalytic-dead SIRT3 mutant.","evidence":"SIRT3-H248Y catalytic mutant, acetylation and O2·- assays, autophagy readouts in HepG2 and in vivo","pmids":["26120888"],"confidence":"High","gaps":["Does not identify SOD2 acetylation sites in this context","Other SIRT3 substrates may contribute"]},{"year":2015,"claim":"Defined SOD2 as essential for mitochondrial bioenergetics by showing complete null cells lose complex I/II activity through Fe/S center disruption and default to glycolysis.","evidence":"CRISPR biallelic SOD2 knockout in HEK293T, bioenergetics, complex assays, EM, SOD-mimetic rescue","pmids":["26208779"],"confidence":"High","gaps":["Did not test tissue-specific bioenergetic consequences","Link to PTM-regulated activity not examined"]},{"year":2016,"claim":"Extended the SIRT3–K68 axis to vascular and skeletal pathophysiology, establishing that SOD2 acetylation inversely tracks activity and contributes to hypertension and bone remodeling.","evidence":"Sirt3-KO and SOD2+/- mice, angiotensin II model, K68 deacetylation and activity assays, in vivo calvaria knockdown","pmids":["28684630","27540894"],"confidence":"High","gaps":["Mechanism upstream of SIRT3 modulation tissue-specific","Does not address acetyltransferase identity"]},{"year":2019,"claim":"Revealed a moonlighting function by showing K68 acetylation converts the dismutase tetramer into a monomeric peroxidase that acts as a tumor promoter and confers tamoxifen resistance.","evidence":"K68Q mimic and physically acetylated protein, native PAGE/gel filtration, peroxidase and transformation/xenograft assays","pmids":["31160585"],"confidence":"High","gaps":["Acetyltransferase driving K68-Ac in tumors unidentified","In vivo prevalence of the monomer not quantified"]},{"year":2019,"claim":"Connected the acetylated monomer to cancer stemness by showing K68-Ac raises mtROS that stabilize HIF2α and activate Oct4/Sox2/Nanog.","evidence":"K68 acetylation analysis, mtROS and HIF2α stabilization assays, stemness gene expression in breast cancer cells","pmids":["31591207"],"confidence":"Medium","gaps":["Single lab","Direct HIF2α oxidation target not defined"]},{"year":2021,"claim":"Provided structural rationale for the tetramer-to-monomer switch, showing K68 acetylation destabilizes the tetramer near the Mn site, favors Fe incorporation and peroxidase activity, and underlies cisplatin/doxorubicin resistance.","evidence":"K68Q mimic, molecular dynamics, peroxidase activity, drug resistance and mitochondrial morphology assays","pmids":["33867840"],"confidence":"Medium","gaps":["Computational structural model awaits experimental structure","Single lab"]},{"year":2019,"claim":"Linked SOD2 catalytic loss directly to human Mendelian disease, identifying p.Gly181Val as causative for lethal neonatal dilated cardiomyopathy with complementation rescue.","evidence":"Exome sequencing, O2·- and activity assays in patient fibroblasts/muscle, lentiviral WT complementation","pmids":["31494578"],"confidence":"High","gaps":["Single family","Mechanism of cardiac specificity not resolved"]},{"year":2019,"claim":"Identified ZIP8 as the manganese supply route required for SOD2 metalloenzyme function in myoblasts.","evidence":"ZIP8 siRNA, Mn supplementation rescue, ICP-MS, SOD2 activity assay","pmids":["31086870"],"confidence":"Medium","gaps":["Single lab","Whether ZIP8 is the sole Mn route in other tissues unknown"]},{"year":2019,"claim":"Placed SOD2 within mutant-p53 redox control, showing mutant p53 induces SIRT3 to deacetylate and activate SOD2 and modulate proliferation.","evidence":"Mutant p53 cell lines, SIRT3 rescue, enzyme activity and ROS assays","pmids":["31812668"],"confidence":"Medium","gaps":["Single lab","Direct vs indirect SIRT3 induction not separated"]},{"year":2014,"claim":"Defined a SIRT1–FoxO3a transcriptional arm controlling SOD2 expression, with angiotensin II suppressing SIRT1 to hyperacetylate FoxO3a and lower MnSOD.","evidence":"Angiotensin II osteoblast treatment, FoxO3a acetylation, MnSOD 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immunology","url":"https://pubmed.ncbi.nlm.nih.gov/20654721","citation_count":23,"is_preprint":false},{"pmid":"35717781","id":"PMC_35717781","title":"Ecklonia cava extracts decrease hypertension-related vascular calcification by modulating PGC-1α and SOD2.","date":"2022","source":"Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie","url":"https://pubmed.ncbi.nlm.nih.gov/35717781","citation_count":22,"is_preprint":false},{"pmid":"35594792","id":"PMC_35594792","title":"HuR-dependent SOD2 protein synthesis is an early adaptation to anchorage-independence.","date":"2022","source":"Redox biology","url":"https://pubmed.ncbi.nlm.nih.gov/35594792","citation_count":21,"is_preprint":false},{"pmid":"24278510","id":"PMC_24278510","title":"Modulation of MnSOD in Cancer:Epidemiological and Experimental Evidence.","date":"2010","source":"Toxicological 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manganese-containing homotetramer that is synthesized with a mitochondrial leader peptide targeting it exclusively to the mitochondrial matrix, where it catalyzes the dismutation of superoxide anions to hydrogen peroxide.\",\n      \"method\": \"Molecular characterization, gene structure analysis, biochemical characterization\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical reconstitution and molecular characterization replicated across multiple studies; foundational enzymatic activity and localization established\",\n      \"pmids\": [\"12126755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"TNF-R1 (but not TNF-R2) mediates TNF/LT-induced MnSOD expression, and MnSOD protection against radiation requires its mitochondrial localization — insertion of the mitochondrial signal sequence into CuZn-SOD or EC-SOD confers radiation protection, whereas MnSOD lacking the mitochondrial signal does not protect.\",\n      \"method\": \"Receptor-specific overexpression, signal peptide swap experiments, radiation survival assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic/molecular dissection with receptor knockout and signal peptide experiments, single lab\",\n      \"pmids\": [\"7599209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MnSOD overexpression inhibits proline oxidase (POX)-induced apoptosis in colorectal cancer cells by dramatically reducing cytochrome c release from mitochondria; the protective effect operates through scavenging superoxide radicals generated by POX, converting them to H2O2.\",\n      \"method\": \"Adenoviral overexpression of MnSOD in DLD-1 cells with inducible POX, cytochrome c release assay, ROS measurement\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean overexpression with defined phenotypic readout (cytochrome c release), single lab\",\n      \"pmids\": [\"15817612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MnSOD overexpression produces a tumor-suppressive effect mediated primarily by the hydrogen peroxide generated from superoxide dismutation, as both catalase and glutathione peroxidase modulate the growth-inhibitory effect.\",\n      \"method\": \"Overexpression studies with antioxidant enzyme co-expression, growth inhibition assays across cancer cell lines\",\n      \"journal\": \"Biomedicine & pharmacotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple cell line experiments with enzymatic modulation, single review synthesizing experimental data\",\n      \"pmids\": [\"15862707\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MnSOD enzymatic activity is regulated by reversible acetylation of specific evolutionarily conserved lysines; SIRT3 deacetylates these lysines in response to changes in mitochondrial nutrient/redox status, enhancing MnSOD activity.\",\n      \"method\": \"Acetylation assays, SIRT3 overexpression/knockdown, enzymatic activity measurements\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — post-translational modification with identified writer (SIRT3), enzymatic activity readout, replicated across multiple subsequent studies\",\n      \"pmids\": [\"21386137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"USP36 is a deubiquitinating enzyme that interacts with SOD2 (confirmed by co-IP and yeast two-hybrid), reduces its polyubiquitination, and extends its half-life, thereby regulating SOD2 protein stability through the ubiquitin-proteasomal pathway.\",\n      \"method\": \"2-DE/MALDI-TOF/MS identification, co-immunoprecipitation, yeast two-hybrid, ubiquitination assay, half-life measurement\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus yeast two-hybrid with functional ubiquitination assay, single lab\",\n      \"pmids\": [\"21268071\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SIRT3 directly deacetylates MnSOD at specific lysine residues to activate its enzymatic dismutase activity; loss of SIRT3 function leads to MnSOD hyperacetylation and reduced ROS scavenging, creating a tumor-permissive phenotype.\",\n      \"method\": \"Deacetylation assays, SIRT3 knockdown/knockout models, enzymatic activity measurements\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — enzymatic mechanism established with identified writer (SIRT3), replicated across multiple labs and studies\",\n      \"pmids\": [\"23886445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MnSOD upregulation in cancer cells establishes a steady mitochondrial H2O2 flow that activates AMPK and drives metabolic shift to glycolysis (Warburg effect); restricting MnSOD expression or inhibiting AMPK suppresses this metabolic switch.\",\n      \"method\": \"MnSOD overexpression/knockdown in cancer cells, AMPK activity assays, metabolic flux measurements, xenograft models\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic manipulation with multiple orthogonal metabolic readouts, in vitro and in vivo validation\",\n      \"pmids\": [\"25651975\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CDK4 translocates to mitochondria under low-dose ionizing radiation and directly phosphorylates MnSOD at serine-106 (S106), enhancing its enzymatic activity and mitochondrial respiration; mitochondria-targeted dominant-negative CDK4 or MnSOD-S106 mutant reverses this adaptive protection.\",\n      \"method\": \"Mitochondrial fractionation, in vitro kinase assay, site-directed mutagenesis, dominant-negative CDK4 constructs, enzymatic activity measurements\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct phosphorylation demonstrated by in vitro kinase assay with mutagenesis validation, confirmed in vivo in mouse skin\",\n      \"pmids\": [\"25578653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIRT3 deacetylates SOD2 at K68 to enhance its activity during osteoblast differentiation; SIRT3 expression increases during differentiation and SOD2 knockdown suppresses differentiation, while SOD2 overexpression rescues osteoblast differentiation in SIRT3-deficient mice.\",\n      \"method\": \"SIRT3/SOD2 knockdown, K68 deacetylation assay, osteoblast differentiation assays, SIRT3-knockout mouse model\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific deacetylation at K68 with in vivo mouse model rescue, replicated across cell and animal systems\",\n      \"pmids\": [\"28914882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sirt3 depletion increases SOD2 acetylation, elevates mitochondrial superoxide, and diminishes endothelial nitric oxide; angiotensin II-induced hypertension involves Sirt3 S-glutathionylation, vascular SOD2 hyperacetylation, and reduced SOD2 activity. SOD2 acetylation inversely correlates with SOD2 activity.\",\n      \"method\": \"Sirt3-knockout and SOD2+/- mouse models, angiotensin II hypertension model, acetylation assays, SOD2 activity measurements, mitochondria-targeted antioxidant rescue\",\n      \"journal\": \"Circulation research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic mouse models with pharmacological rescue, validated in human hypertensive subjects\",\n      \"pmids\": [\"28684630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Sirt3 deacetylates K68 of SOD2 to reduce mitochondrial ROS and suppress osteoclastogenesis; Sirt3-targeted siRNA decreases SOD2 deacetylation at K68, increasing osteoclast differentiation. In vivo knockdown of SOD2 or Sirt3 in mouse calvaria decreases bone volume and increases osteoclast surface.\",\n      \"method\": \"siRNA knockdown, site-specific deacetylation assay (K68), in vivo calvaria injection, bone volume measurements\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — site-specific K68 deacetylation confirmed with in vitro and in vivo validation, two orthogonal genetic approaches\",\n      \"pmids\": [\"27540894\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Acetylation of MnSOD at lysine 68 (K68-Ac) shifts its quaternary structure from a homotetramer (superoxide dismutase activity) to a monomer that functions as a peroxidase; MnSOD-K68Q (acetylation mimic) acts as a tumor promoter in transformation assays and confers tamoxifen resistance in breast cancer cells.\",\n      \"method\": \"K68Q acetylation-mimic mutation, in vitro transformation assay, xenograft growth assay, biochemical peroxidase activity assay, gel filtration/native PAGE for oligomeric state, physically acetylated K68-Ac protein analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with acetylation-mimic and physically acetylated protein, multiple orthogonal biochemical and cellular assays in single rigorous study\",\n      \"pmids\": [\"31160585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SOD2 K68 acetylation promotes breast cancer cell stemness by increasing mitochondrial ROS (mtROS), which stabilize HIF2α, activating stemness genes (Oct4, Sox2, Nanog).\",\n      \"method\": \"K68 acetylation analysis, mtROS measurement, HIF2α stabilization assay, stemness gene expression, breast cancer cell models\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway dissection with multiple readouts, single lab\",\n      \"pmids\": [\"31591207\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MnSOD-K68 acetylation mimic (MnSOD-K68Q) leads to cisplatin and doxorubicin resistance, shifts MnSOD to monomeric form, alters mitochondrial morphology and metabolism; the monomer appears to incorporate Fe to maximally induce peroxidase activity, with conformational change adjacent to Mn2+ binding site destabilizing the tetramer.\",\n      \"method\": \"Acetylation-mimic mutation, drug resistance assays, molecular dynamics simulation, biochemical peroxidase activity, mitochondrial structural analysis\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with in vitro functional assays and computational structural analysis, single lab\",\n      \"pmids\": [\"33867840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MnSOD upregulation in senescent keratinocytes produces H2O2 overproduction that drives autophagic cell death; overexpression of MnSOD or exogenous H2O2 reproduces the autophagic death, which is blocked by catalase treatment or autophagy inhibitors (3-methyladenine, anti-Atg5 siRNA).\",\n      \"method\": \"MnSOD overexpression, catalase rescue, autophagy inhibition (3-MA, Atg5 siRNA), lysotracker staining, LC3 vesiculation, TEM\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal autophagy readouts with genetic and pharmacological rescue, single lab\",\n      \"pmids\": [\"20856861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SIRT3 depletion reduces SOD2 activity by promoting acetylation, leading to elevated mitochondrial O2•- and hepatotoxicity; a catalytically inactive SIRT3 mutant (SIRT3-H248Y) loses the capacity to suppress cadmium-induced autophagy, confirming deacetylase activity is required.\",\n      \"method\": \"SIRT3 overexpression with catalytic mutant (H248Y), SOD2 acetylation assay, mitochondrial O2•- measurement, autophagy assay in HepG2 cells and in vivo\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — catalytic mutant controls establish deacetylase-dependency, confirmed in vivo, multiple orthogonal readouts\",\n      \"pmids\": [\"26120888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"C/EBPβ is required for TNF-induced MnSOD expression and protection against TNF-induced apoptosis; mechanistically, C/EBPβ is required for NF-κB p65 binding to MnSOD's intronic TNF response element and for histone acetylation of that element in response to TNF.\",\n      \"method\": \"C/EBPβ-deficient fibroblasts, ectopic C/EBPβ expression, MnSOD stable transfection rescue, ChIP for NF-κB binding and histone acetylation\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP assay with genetic rescue experiments, single lab\",\n      \"pmids\": [\"16850160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Intact TNF signaling (via TNFR1/R2) is required for low-dose ionizing radiation to induce elevated MnSOD activity and SOD2-mediated adaptive responses; amifostine (via its thiol WR1065) can directly activate NF-κB to elevate SOD2 activity independent of TNF receptors. SOD2 siRNA completely abolishes both SOD2 activity elevation and adaptive responses.\",\n      \"method\": \"TNFR1/R2 knockout cells and mice, SOD2 siRNA, micronucleus assay, SOD2 activity measurement\",\n      \"journal\": \"Radiation research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with knockout cells and mice, siRNA knockdown, confirmed in vivo\",\n      \"pmids\": [\"23237540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SOD2 knockdown in human cells (CRISPR/Cas9 complete null) impairs mitochondrial bioenergetics; SOD2-null cells prefer glycolysis over oxidative phosphorylation and show impaired mitochondrial complex I and II activities (from disruption of Fe/S centers), with perturbed mitochondrial ultrastructure.\",\n      \"method\": \"CRISPR/Cas9 biallelic SOD2 knockout in HEK293T cells, mitochondrial bioenergetics assay, complex I/II activity, electron microscopy\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complete genetic null with multiple orthogonal metabolic and structural readouts, pharmacological rescue with SOD mimetic\",\n      \"pmids\": [\"26208779\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Manganese influx via ZIP8 transporter is essential for SOD2 activity in skeletal myoblasts; ZIP8 knockdown impairs Mn-dependent SOD2 activity and can be partially rescued by Mn supplementation, demonstrating that ZIP8-mediated Mn delivery is required for SOD2 metalloenzyme function.\",\n      \"method\": \"ZIP8 siRNA knockdown, Mn supplementation rescue, SOD2 activity assay, ICP-MS metal quantification, cell differentiation assays\",\n      \"journal\": \"Metallomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with ion supplementation rescue and enzymatic activity readout, single lab\",\n      \"pmids\": [\"31086870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Mutant p53 induces SIRT3 expression, which deacetylates MnSOD to enhance its enzymatic activity; SIRT3 restoration reverses MnSOD activity decrease caused by mutant p53 knockdown. MnSOD knockdown further enhances mutant p53-mediated ROS increase and counteracts cell hyperproliferation.\",\n      \"method\": \"p53 mutant cell lines, qPCR, immunoblotting, enzyme activity assay, SIRT3 overexpression rescue, ROS assay after transfection\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue experiments with enzymatic activity readout, single lab, multiple orthogonal approaches\",\n      \"pmids\": [\"31812668\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Caffeine binds SIRT3 with high affinity (KD = 6.858×10⁻⁷ M) and promotes SIRT3-substrate binding, enhancing SIRT3 deacetylase activity toward SOD2, thereby reducing SOD2 acetylation and increasing SOD2 enzymatic activity. The SIRT3 inhibitor 3-TYP reverses caffeine-induced SOD2 activation.\",\n      \"method\": \"Binding affinity assay, SIRT3 enzyme activity assay, SOD2 acetylation measurement, 3-TYP inhibitor control, in vitro and in vivo models\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — binding affinity measured, enzymatic assay with pharmacological inhibitor controls, single lab\",\n      \"pmids\": [\"33015038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous missense variant (p.Gly181Val) in SOD2 causes lethal neonatal dilated cardiomyopathy; patient fibroblasts show significantly increased superoxide levels and reduced SOD2 catalytic activity; lentiviral complementation with wild-type SOD2 completely restores mitochondrial SOD2 activity.\",\n      \"method\": \"Exome sequencing, hydroethidine oxidation assay for O2•-, SOD2 activity assay in patient fibroblasts and muscle, lentiviral wild-type SOD2 complementation\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct enzymatic activity measurement in patient cells with genetic complementation rescue, multiple orthogonal validations\",\n      \"pmids\": [\"31494578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"HuR (ELAVL1) RNA-binding protein accumulates in the cytosol upon anchorage-independence and binds SOD2 mRNA, promoting increased association with heavy polyribosomes and nascent SOD2 protein synthesis. p38 MAPK activation is necessary for HuR-SOD2 mRNA interactions and induction of SOD2 protein output in detached cells.\",\n      \"method\": \"Polyribosome profiling, HuR siRNA knockdown, RIP assay, p38 inhibition, nascent protein synthesis assay\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP assay plus polyribosome profiling with siRNA knockdown, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"35594792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SOD2 knockdown in RPE cells via AAV-delivered ribozyme reduces MnSOD protein, increases superoxide, causes oxidative protein damage, progressive loss of electroretinograph response, RPE degeneration, Bruch's membrane thickening, and photoreceptor apoptosis — establishing SOD2 as essential for RPE and retinal function.\",\n      \"method\": \"AAV-delivered ribozyme knockdown of MnSOD in mouse retina, ERG, immunoblot, LC-MS/MS oxidative damage markers, light/electron microscopy\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic knockdown with multiple orthogonal structural and functional readouts\",\n      \"pmids\": [\"17898259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MnSOD overexpression in LNCaP prostate cancer cells induces neuroendocrine (NE) differentiation features including synaptophysin expression, androgen independence, Bcl-2 upregulation, and prevention of docetaxel/etoposide/TNF-induced cell death; the effects are linked to reduced superoxide and elevated H2O2 levels.\",\n      \"method\": \"Stable MnSOD-overexpressing LNCaP clones, NE marker expression (synaptophysin), androgen receptor localization, apoptosis assays with multiple chemotherapeutics, ROS measurement\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular phenotype with multiple markers in stable overexpression model, single lab\",\n      \"pmids\": [\"21056653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOD2 drives glycolysis via H2O2-mediated AMPK activation in colorectal cancer; proper SOD2 levels maintain mitochondrial function by superoxide disposal, while overexpression induces H2O2-mediated AMPK upregulation and glycolysis.\",\n      \"method\": \"SOD2 knockdown in CRC cell lines, mitochondrial function assays, AMPK activation measurement, glycolysis measurement, proliferation/migration/invasion assays\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with metabolic pathway dissection, single lab\",\n      \"pmids\": [\"32149414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOD2 expression is transcriptionally upregulated during TGF-β-induced EMT by NF-κB and ZEB2 (but not ZEB1); SOD2-mediated antioxidant activity restricts early conversion of CD44L epithelial cells to CD44H mesenchymal cells and suppresses TGF-β-mediated ROS induction and senescence.\",\n      \"method\": \"Genetically engineered cell lines, RNAi knockdown, flow cytometry for CD44 subpopulations, TGF-β stimulation, transcription factor pathway analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined pathway placement with transcription factor specificity (ZEB2 vs ZEB1) and functional EMT readouts, single lab\",\n      \"pmids\": [\"25659582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Angiotensin II inhibits SIRT1 in osteoblasts, leading to hyperacetylation of FoxO3a, which reduces expression of MnSOD and catalase, causing mitochondrial oxidative stress and mtDNA damage; SIRT1 activator (SRT3025) or MnSOD mimetic (MnTBAP) rescue these effects.\",\n      \"method\": \"Angiotensin II treatment of osteoblasts, SIRT1/SIRT3 protein level analysis, FoxO3a acetylation assay, MnSOD mRNA/protein measurement, pharmacological rescue\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway epistasis with pharmacological rescue, SIRT1 specificity over SIRT3 established, single lab\",\n      \"pmids\": [\"25450701\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOD2 deficiency-induced oxidative stress in granulosa cells decreases progesterone and estradiol production by reducing StAR protein gene expression, key steroidogenic enzyme genes, and impairing cholesterol transport from cytosol to mitochondria.\",\n      \"method\": \"Sod2+/- mouse model, granulosa cell isolation, steroid hormone measurement, qRT-PCR for StAR and steroidogenic enzymes, lipid peroxidation assay\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo genetic model with defined molecular mechanism (cholesterol transport and gene expression), single lab\",\n      \"pmids\": [\"32717420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SOD2 knockdown in periodontitis cells leads to increased NLRP3 inflammasome component production; SOD2 is upregulated through the NF-κB pathway and exerts a protective role by suppressing the NLRP3 inflammasome-caspase-1-IL-1β axis.\",\n      \"method\": \"CRISPR/Cas9 SOD2 knockout, immunoblot for NLRP3 components, NF-κB pathway analysis\",\n      \"journal\": \"Oral diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR knockout with defined inflammasome pathway readout, single lab\",\n      \"pmids\": [\"29972711\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"IT (IFN-γ + TNF-α) cytokine stimulation upregulates SOD2 in MSCs, decreasing mitochondrial ROS; SOD2 knockdown leads to enhanced adipogenic differentiation but reduced immunosuppression; SOD2-dependent suppression of mtROS inhibits PGC-1α expression and mitochondrial biogenesis while promoting glycolysis.\",\n      \"method\": \"SOD2 knockdown in human adipose-MSCs, adipogenic differentiation assay, immunosuppression co-culture assay, mtROS measurement, PGC-1α expression, DSS colitis mouse model\",\n      \"journal\": \"Molecular therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockdown with multiple orthogonal differentiation and immunological readouts, confirmed in vivo\",\n      \"pmids\": [\"38310354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Mitochondrial Sod2 genetically interacts with the DNA helicase Sgs1 to suppress nuclear chromosomal rearrangements under oxidative stress; PQ-induced chromosome rearrangements in the absence of Sod2 are promoted by Rad51 recombinase and the polymerase subunit Pol32, and depend on Rev1/Pol ζ translesion synthesis.\",\n      \"method\": \"Genetic epistasis in yeast (sod2Δ sgs1Δ double mutant), paraquat-induced oxidative stress, chromosomal rearrangement reporter assay, Rad51/Pol32/Rev1 epistasis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with multiple deletion combinations and defined chromosomal rearrangement readout, single lab (yeast ortholog study)\",\n      \"pmids\": [\"37638880\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SOD2 (MnSOD) is a mitochondria-targeted manganese-containing homotetramer that dismutates superoxide to H2O2; its enzymatic activity is bidirectionally regulated by post-translational modifications — SIRT3-mediated deacetylation at K68 (and K122) activates it, while acetylation at K68 by unknown acetyltransferases shifts the tetramer to a monomeric peroxidase form that promotes tumor progression and drug resistance — and by CDK4-mediated phosphorylation at S106, which enhances activity during adaptive stress responses; protein stability is controlled by USP36 deubiquitination; upstream transcriptional activation requires NF-κB/C/EBPβ, Nrf2, and SIRT1-FoxO3a signaling axes; and downstream, SOD2-generated H2O2 activates AMPK to drive metabolic reprogramming toward glycolysis, stabilizes HIF2α to promote stemness, and modulates inflammasome and apoptotic signaling, collectively explaining SOD2's dual tumor-suppressive and tumor-promoting roles depending on its acetylation state and cellular context.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SOD2 (MnSOD) is a manganese-dependent homotetramer synthesized with a cleavable mitochondrial leader peptide that targets it exclusively to the mitochondrial matrix, where it dismutates superoxide to hydrogen peroxide and thereby governs mitochondrial redox homeostasis [#0]. Its metalloenzyme function depends on ZIP8-mediated manganese delivery [#20], and complete loss of activity disrupts Fe/S-dependent respiratory complexes I and II, shifts cells toward glycolysis, and perturbs mitochondrial ultrastructure [#19]; a homozygous p.Gly181Val variant that abolishes catalytic activity causes lethal neonatal dilated cardiomyopathy, with wild-type complementation restoring activity in patient cells [#23]. SOD2 activity is bidirectionally tuned by post-translational modification: SIRT3 deacetylates conserved lysines including K68 to activate the dismutase, and loss of SIRT3 produces hyperacetylation, elevated superoxide, and tissue dysfunction across bone, vascular, and hepatic contexts [#4, #6, #9, #10, #16]; CDK4 translocating to mitochondria under low-dose radiation phosphorylates S106 to enhance activity during adaptive stress responses [#8]; and USP36 deubiquitination stabilizes the protein and extends its half-life [#5]. Acetylation at K68 also remodels SOD2's quaternary structure, converting the dismutase tetramer into a monomeric peroxidase that promotes transformation, stemness via HIF2\\u03b1 stabilization, and chemoresistance [#12, #13, #14]. The H2O2 product is itself a signaling output: SOD2-derived H2O2 activates AMPK to drive a glycolytic (Warburg) shift [#7, #27], suppresses the NLRP3 inflammasome [#31], and at high flux drives autophagic cell death [#15], explaining SOD2's context-dependent tumor-suppressive and tumor-promoting roles. Transcriptional induction proceeds through NF-\\u03baB/C/EBP\\u03b2 acting at an intronic TNF response element [#17], ZEB2 during TGF-\\u03b2-driven EMT [#28], and SIRT1\\u2013FoxO3a signaling [#29], while HuR/p38 MAPK provides translational control under anchorage independence [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established the foundational identity of SOD2 as a Mn-containing matrix homotetramer that converts superoxide to H2O2, defining the enzymatic and compartmental basis for all subsequent function.\",\n      \"evidence\": \"Molecular and biochemical characterization, gene structure analysis\",\n      \"pmids\": [\"12126755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address regulation of activity\", \"Does not connect enzyme output to downstream signaling\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Resolved whether SOD2's protective function depends on its location by showing mitochondrial targeting is necessary and sufficient for radiation protection, and placed SOD2 induction downstream of TNF-R1.\",\n      \"evidence\": \"Receptor-specific overexpression and signal peptide swap with radiation survival assays\",\n      \"pmids\": [\"7599209\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Does not define the transcriptional machinery linking TNF-R1 to SOD2\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined the transcriptional logic of TNF-induced SOD2 expression by showing C/EBP\\u03b2 enables NF-\\u03baB p65 binding and histone acetylation at an intronic TNF response element.\",\n      \"evidence\": \"C/EBP\\u03b2-deficient fibroblasts with ChIP and MnSOD rescue\",\n      \"pmids\": [\"16850160\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Does not address other inducers (Nrf2, FoxO3a)\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed that SOD2's growth-inhibitory and anti-apoptotic effects are mediated by its H2O2 product rather than superoxide removal alone, establishing the enzyme product as the functional effector.\",\n      \"evidence\": \"Adenoviral/stable overexpression with catalase and GPx co-expression, cytochrome c release and growth assays\",\n      \"pmids\": [\"15817612\", \"15862707\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Overexpression contexts may not reflect endogenous flux\", \"Single-lab readouts\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified reversible acetylation as the principal switch on SOD2 activity and named SIRT3 as the deacetylase that activates the enzyme in response to mitochondrial nutrient/redox state.\",\n      \"evidence\": \"Acetylation assays with SIRT3 gain/loss and enzymatic activity measurement\",\n      \"pmids\": [\"21386137\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not pinpoint individual lysines\", \"Acetyltransferase writer not identified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Established protein-stability control of SOD2 by identifying USP36 as a deubiquitinase that binds SOD2 and extends its half-life.\",\n      \"evidence\": \"MS identification, reciprocal co-IP, yeast two-hybrid, ubiquitination and half-life assays\",\n      \"pmids\": [\"21268071\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cognate E3 ligase not identified\", \"Single lab\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Consolidated the SIRT3\\u2013SOD2 axis by showing direct site-specific deacetylation activates dismutase activity and that SIRT3 loss creates a tumor-permissive, hyperacetylated, ROS-rich state.\",\n      \"evidence\": \"Deacetylation assays with SIRT3 knockdown/knockout and activity measurement\",\n      \"pmids\": [\"23886445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase still unidentified\", \"Tissue-specific consequences not yet mapped\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated a second activating modification by showing CDK4 enters mitochondria after low-dose radiation and phosphorylates S106 to boost activity and respiration during adaptive protection.\",\n      \"evidence\": \"Mitochondrial fractionation, in vitro kinase assay, S106 mutagenesis, dominant-negative CDK4, in vivo mouse skin\",\n      \"pmids\": [\"25578653\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Phosphatase reversing S106 unknown\", \"Crosstalk with acetylation not defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Localized SIRT3-mediated activation to K68 and proved its physiological importance in osteoblast differentiation via in vivo rescue in SIRT3-deficient mice.\",\n      \"evidence\": \"K68 deacetylation assay, SIRT3/SOD2 knockdown, osteoblast differentiation, SIRT3-KO mouse rescue\",\n      \"pmids\": [\"28914882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Other regulated lysines (K122) not addressed here\", \"Does not address tumor contexts\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined a downstream signaling role by showing SOD2-derived H2O2 activates AMPK to drive a glycolytic Warburg shift in cancer cells.\",\n      \"evidence\": \"Reciprocal SOD2 manipulation, AMPK and metabolic flux assays, xenografts\",\n      \"pmids\": [\"25651975\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct H2O2 target on the AMPK pathway not identified\", \"Threshold separating protective vs pro-tumor flux unclear\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed that SIRT3 deacetylase activity is mechanistically required for SOD2-dependent control of mitochondrial superoxide and stress-induced autophagy, using a catalytic-dead SIRT3 mutant.\",\n      \"evidence\": \"SIRT3-H248Y catalytic mutant, acetylation and O2\\u00b7- assays, autophagy readouts in HepG2 and in vivo\",\n      \"pmids\": [\"26120888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify SOD2 acetylation sites in this context\", \"Other SIRT3 substrates may contribute\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defined SOD2 as essential for mitochondrial bioenergetics by showing complete null cells lose complex I/II activity through Fe/S center disruption and default to glycolysis.\",\n      \"evidence\": \"CRISPR biallelic SOD2 knockout in HEK293T, bioenergetics, complex assays, EM, SOD-mimetic rescue\",\n      \"pmids\": [\"26208779\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test tissue-specific bioenergetic consequences\", \"Link to PTM-regulated activity not examined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Extended the SIRT3\\u2013K68 axis to vascular and skeletal pathophysiology, establishing that SOD2 acetylation inversely tracks activity and contributes to hypertension and bone remodeling.\",\n      \"evidence\": \"Sirt3-KO and SOD2+/- mice, angiotensin II model, K68 deacetylation and activity assays, in vivo calvaria knockdown\",\n      \"pmids\": [\"28684630\", \"27540894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism upstream of SIRT3 modulation tissue-specific\", \"Does not address acetyltransferase identity\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed a moonlighting function by showing K68 acetylation converts the dismutase tetramer into a monomeric peroxidase that acts as a tumor promoter and confers tamoxifen resistance.\",\n      \"evidence\": \"K68Q mimic and physically acetylated protein, native PAGE/gel filtration, peroxidase and transformation/xenograft assays\",\n      \"pmids\": [\"31160585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase driving K68-Ac in tumors unidentified\", \"In vivo prevalence of the monomer not quantified\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected the acetylated monomer to cancer stemness by showing K68-Ac raises mtROS that stabilize HIF2\\u03b1 and activate Oct4/Sox2/Nanog.\",\n      \"evidence\": \"K68 acetylation analysis, mtROS and HIF2\\u03b1 stabilization assays, stemness gene expression in breast cancer cells\",\n      \"pmids\": [\"31591207\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct HIF2\\u03b1 oxidation target not defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Provided structural rationale for the tetramer-to-monomer switch, showing K68 acetylation destabilizes the tetramer near the Mn site, favors Fe incorporation and peroxidase activity, and underlies cisplatin/doxorubicin resistance.\",\n      \"evidence\": \"K68Q mimic, molecular dynamics, peroxidase activity, drug resistance and mitochondrial morphology assays\",\n      \"pmids\": [\"33867840\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Computational structural model awaits experimental structure\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked SOD2 catalytic loss directly to human Mendelian disease, identifying p.Gly181Val as causative for lethal neonatal dilated cardiomyopathy with complementation rescue.\",\n      \"evidence\": \"Exome sequencing, O2\\u00b7- and activity assays in patient fibroblasts/muscle, lentiviral WT complementation\",\n      \"pmids\": [\"31494578\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Single family\", \"Mechanism of cardiac specificity not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified ZIP8 as the manganese supply route required for SOD2 metalloenzyme function in myoblasts.\",\n      \"evidence\": \"ZIP8 siRNA, Mn supplementation rescue, ICP-MS, SOD2 activity assay\",\n      \"pmids\": [\"31086870\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Whether ZIP8 is the sole Mn route in other tissues unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed SOD2 within mutant-p53 redox control, showing mutant p53 induces SIRT3 to deacetylate and activate SOD2 and modulate proliferation.\",\n      \"evidence\": \"Mutant p53 cell lines, SIRT3 rescue, enzyme activity and ROS assays\",\n      \"pmids\": [\"31812668\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct vs indirect SIRT3 induction not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a SIRT1\\u2013FoxO3a transcriptional arm controlling SOD2 expression, with angiotensin II suppressing SIRT1 to hyperacetylate FoxO3a and lower MnSOD.\",\n      \"evidence\": \"Angiotensin II osteoblast treatment, FoxO3a acetylation, MnSOD expression, SIRT1 activator and MnTBAP rescue\",\n      \"pmids\": [\"25450701\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct FoxO3a occupancy at SOD2 promoter not shown here\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated pharmacological tunability of the SIRT3\\u2013SOD2 axis by showing caffeine binds SIRT3 and enhances its deacetylation of SOD2 to raise activity.\",\n      \"evidence\": \"Binding affinity measurement, SIRT3 and SOD2 activity assays, 3-TYP inhibitor control\",\n      \"pmids\": [\"33015038\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"In vivo specificity of caffeine effect uncertain\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified translational regulation of SOD2 by showing HuR binds SOD2 mRNA upon anchorage-independence and, via p38 MAPK, boosts polysome loading and protein synthesis.\",\n      \"evidence\": \"Polyribosome profiling, RIP, HuR siRNA, p38 inhibition, nascent synthesis assay\",\n      \"pmids\": [\"35594792\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"HuR binding site on SOD2 mRNA not mapped\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Broadened SOD2's signaling outputs to inflammasome control, steroidogenesis, EMT restraint, and stromal cell fate, showing context-dependent roles via mtROS suppression.\",\n      \"evidence\": \"CRISPR/knockdown across periodontitis cells, granulosa cells, EMT models, and MSCs with inflammasome, hormone, CD44, and PGC-1\\u03b1 readouts\",\n      \"pmids\": [\"29972711\", \"32717420\", \"25659582\", \"38310354\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Each context single lab\", \"Mechanistic convergence on a common mtROS threshold not established\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established the physiological essentiality of SOD2 in vivo by showing retinal knockdown causes oxidative damage, RPE degeneration, and photoreceptor apoptosis.\",\n      \"evidence\": \"AAV-ribozyme knockdown in mouse retina, ERG, oxidative damage MS, microscopy\",\n      \"pmids\": [\"17898259\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not separate enzymatic from structural contributions\", \"Tissue-specific to retina\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed an unexpected genome-stability function for mitochondrial Sod2, showing it cooperates with the Sgs1 helicase to suppress oxidative-stress-driven nuclear chromosomal rearrangements.\",\n      \"evidence\": \"Yeast genetic epistasis (sod2\\u0394 sgs1\\u0394), paraquat stress, rearrangement reporter, Rad51/Pol32/Rev1 epistasis\",\n      \"pmids\": [\"37638880\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Yeast ortholog study\", \"Human relevance of the mito-to-nucleus genome link unestablished\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The acetyltransferase(s) that acetylate SOD2 K68 to generate the tumor-promoting peroxidase monomer remain unidentified, leaving the writer side of the activating/inactivating PTM switch unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No K68 acetyltransferase identified in the corpus\", \"How phosphorylation, acetylation, and ubiquitination integrate is unknown\", \"No experimental high-resolution structure of the acetylated monomer\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 4, 8, 12, 19, 23]},\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [0, 2, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 8, 19]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 8, 16, 18]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [7, 19, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SIRT3\",\n      \"CDK4\",\n      \"USP36\",\n      \"ZIP8\",\n      \"HuR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}