{"gene":"PRDX3","run_date":"2026-06-10T06:43:35","timeline":{"discoveries":[{"year":1995,"finding":"SP-22 (PRDX3) has radical scavenging activity, protecting radical-sensitive proteins (tryptophan hydroxylase, glutamine synthetase, hemoglobin) from oxidative damage; the protecting activity was enhanced by serum factor(s), consistent with its function as a substrate of mitochondrial ATP-dependent protease in adrenal cortex mitochondria.","method":"In vitro radical scavenging assay with Fe2+/dithiothreitol radical-generating system; biochemical protection assays with purified protein","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — direct in vitro biochemical assay with purified protein, single study, single lab","pmids":["7654218"],"is_preprint":false},{"year":1997,"finding":"SP-22 (PRDX3) functions as a thioredoxin-dependent peroxide reductase in mitochondria: in the presence of mitochondrial thioredoxin (mt-Trx), a partially purified thioredoxin reductase (NADPH-dependent Nbs2 reductase), and NADPH, SP-22 catalyzes the stoichiometric reduction of H2O2 and tert-butyl hydroperoxide with concomitant NADPH oxidation.","method":"In vitro reconstitution assay with purified/partially purified SP-22, mt-Trx, Nbs2 reductase, and NADPH; NADPH oxidation monitored concomitant with H2O2 disappearance; functional protection of oxyhemoglobin from ascorbate-induced damage","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — full enzymatic reconstitution with three purified components, stoichiometric substrate consumption measured, multiple functional readouts in single study","pmids":["9363753"],"is_preprint":false},{"year":1998,"finding":"Human T cell cyclophilin 18 (hCyP18) directly binds to PRDX3 (Aop1) and stimulates its enzymatic antioxidant activity; the interaction is specific, as other PPIases do not stimulate Aop1 activity.","method":"Protein-protein interaction assay (binding confirmed); enzymatic activity stimulation assay with hCyP18 and other PPIases as controls","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding and functional stimulation demonstrated, single lab, limited methodological detail in abstract","pmids":["9545370"],"is_preprint":false},{"year":1999,"finding":"SP-22 (PRDX3) functions as a mitochondrial antioxidant in cardiovascular endothelial cells: its expression is induced by oxidative stresses (including mitochondrial respiratory inhibitors that increase superoxide), and cells pre-treated with mild oxidative stress to increase SP-22 become tolerant to subsequent intense oxidative stress, while cells depleted of SP-22 by antisense oligodeoxynucleotide become more labile to oxidative stress.","method":"Antisense oligodeoxynucleotide knockdown in bovine aortic endothelial cells; oxidative stress tolerance assays; SP-22 induction by respiratory inhibitors (antimycin A); in vivo induction in rat myocardial infarction model","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function (antisense KD) with defined phenotypic readout plus gain-of-function (preconditioning), replicated in vivo","pmids":["9890990"],"is_preprint":false},{"year":2002,"finding":"PRDX3 is a transcriptional target of c-Myc: Myc binds preferentially to a ~930-bp region surrounding PRDX3 exon 1 (by ChIP), PRDX3 expression is induced by the mycER system and reduced in c-myc-/- cells, and PRDX3 is required for Myc-mediated proliferation, transformation, and apoptosis after glucose withdrawal. PRDX3 is also essential for maintaining mitochondrial mass and membrane potential in transformed cells.","method":"Chromatin immunoprecipitation (ChIP) across entire PRDX3 genomic sequence; mycER inducible system; c-myc-/- cell lines; fluorescent mitochondrial probes (mass and membrane potential); loss-of-function proliferation and transformation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (ChIP, genetic KO, inducible system, functional assays), single lab but rigorous","pmids":["12011429"],"is_preprint":false},{"year":2003,"finding":"Bovine mitochondrial SP-22 (PRDX3) is a 2-Cys peroxiredoxin that forms a stable decameric toroid of five basic dimeric units with intermolecular disulfide bonds linking catalytic Cys-47 of one subunit to Cys-168 of the adjacent monomer; Cys-47 is the catalytic residue (confirmed by C47S mutagenesis abolishing activity), while Cys-66 and Cys-168 are non-catalytic. The disulfide bonds are not required for overall structural integrity.","method":"Overexpression in E. coli; cysteine-to-serine mutagenesis (C47S, C66S, C168S); peroxidase activity assays; electron microscopy structural analysis of purified recombinant protein","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with active-site mutagenesis and structural characterization, multiple orthogonal methods in single rigorous study","pmids":["12773537"],"is_preprint":false},{"year":2007,"finding":"MER5/PRDX3 knockout mice accumulate significantly higher intracellular ROS levels in macrophages under basal conditions, and exhibit more severe LPS-induced lung injury (inflammatory cell infiltration, airway wall thickening, DNA oxidation as 8-OHdG, protein carbonylation) than wild-type mice, establishing PRDX3 as an important ROS scavenger in vivo.","method":"Germline knockout mouse model; intratracheal LPS inoculation; intracellular ROS measurement; 8-OHdG assay; protein carbonylation assay; histological analysis","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean KO mouse with defined cellular and tissue phenotype, multiple oxidative damage readouts","pmids":["17316558"],"is_preprint":false},{"year":2007,"finding":"PRDX3 is localized to the mitochondria in human lens epithelial cells and is specifically induced by low levels of H2O2 (as little as 2 µM) but not by TBHP or heat-shock, suggesting a specific H2O2-sensing induction mechanism in the lens.","method":"Immunofluorescence (mitochondrial co-localization); RT-PCR; Western blot; H2O2, TBHP, and heat-treatment comparisons in human lens epithelial cells and rat lenses","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — localization confirmed by immunofluorescence, specific H2O2 induction shown by controlled comparisons, single lab","pmids":["17893648"],"is_preprint":false},{"year":2007,"finding":"PRDX3 (AOP-1) directly interacts with cardiac troponin I-interacting kinase TNNI3K via TNNI3K's ANK motif, confirmed by yeast two-hybrid, in vitro binding assay, co-expression in vivo, and confocal immunofluorescence co-localization; co-expression of AOP-1 inhibits TNNI3K kinase activity in an in vitro kinase assay.","method":"Yeast two-hybrid screening of adult heart cDNA library; in vitro binding assay; co-expression in vivo; confocal immunofluorescence co-localization; in vitro kinase assay","journal":"Biochemistry. Biokhimiia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by in vitro binding and in vivo co-expression plus functional kinase inhibition, multiple orthogonal methods, single lab","pmids":["18205602"],"is_preprint":false},{"year":2012,"finding":"Drosophila Prx3 (ortholog of human PRDX3) is required for oxidative stress resistance in adult flies: RNAi-mediated knockdown does not change phenotype under normal conditions but results in shorter survival in the presence of H2O2; Prx3 expression levels decline with aging, linking PRDX3 to age-dependent oxidative stress competence.","method":"RNAi-induced knockdown in Drosophila; H2O2 survival assay; expression level analysis across ages","journal":"Biomedical research (Tokyo, Japan)","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vivo genetic KD with defined phenotypic readout (survival under oxidative stress), single lab, model organism ortholog","pmids":["23124252"],"is_preprint":false},{"year":2016,"finding":"PRDX3 knockdown in HepG2 hepatocellular carcinoma cells increases mtDNA oxidation, decreases ATP synthase expression and cellular ATP levels (slowing growth), and enhances invasive properties via TIMP-1 down-regulation and increased ECM degradation.","method":"Stable PRDX3 knockdown cell lines; quantitative proteomics (differentially expressed proteins); cellular ATP measurement; invasion assays; TIMP-1 expression analysis","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable KD with multiple functional readouts (mtDNA oxidation, ATP, invasion, proteomics), single lab","pmids":["26983019"],"is_preprint":false},{"year":2016,"finding":"Under oxidative stress (H2O2), PRDX3 interacts with UNG1 (mitochondrial uracil-DNA glycosylase isoform 1) via a disulfide linkage; this interaction protects UNG1 from ROS-mediated degradation by Lon protease 1 (LonP1) and prevents mtDNA oxidation. PRDX3 knockdown aggravates LonP1-dependent UNG1 degradation and mtDNA oxidation.","method":"Co-immunoprecipitation/proteomics under oxidative stress; disulfide linkage characterization; PRDX3 knockdown; Lon protease 1 interaction; mtDNA oxidation assay","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal IP with redox-specific disulfide linkage, KD with functional consequence, single lab","pmids":["27480846"],"is_preprint":false},{"year":2019,"finding":"SIRT3 deacetylates PRDX3 at lysine K253; acetylation of PRDX3 (increased by SIRT3 knockdown or sirtuin inhibition with nicotinamide) impairs its antioxidative activity and dimerization. The K253R (deacetylation-mimetic) mutation increases PRDX3 dimerization and protects against mitochondrial oxidative damage and apoptosis in I/R conditions, while K253Q (acetylation-mimetic) abolishes protection.","method":"SIRT3 knockdown; nicotinamide sirtuin inhibition; immunoprecipitation to identify acetylation site; K253R and K253Q mutagenesis; dimerization assay; mitochondrial damage and apoptosis readouts in vitro and in SIRT3 KO mice; intestinal I/R model","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — site-specific mutagenesis (K253R, K253Q) with functional rescue/loss, KO mouse model, in vitro and in vivo validation, multiple orthogonal methods","pmids":["31655428"],"is_preprint":false},{"year":2020,"finding":"Under high glucose conditions, PRDX3 is acetylated (mediated via SIRT1 degradation leading to SIRT3 inactivation), which promotes PRDX3 hyperoxidation, mitochondrial dysfunction, and beta-cell apoptosis via NOX-JNK-p66Shc signalosome activation; SIRT3 physically interacts with PRDX3 and deacetylates it, protecting against hyperoxidation.","method":"Co-immunoprecipitation (SIRT3-PRDX3 physical interaction); SIRT1 siRNA knockdown and inhibitor (EX-527); acetylation and hyperoxidation assays; apoptosis assays in INS-1 and 1.1B4 cells","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP for physical interaction, functional KD with signaling pathway readouts, single lab","pmids":["32763411"],"is_preprint":false},{"year":2021,"finding":"Biallelic loss-of-function mutations in PRDX3 cause cerebellar ataxia in humans; patient fibroblasts lacking PRDX3 show decreased glutathione peroxidase activity and decreased mitochondrial maximal respiratory capacity; PRDX3 knockdown in cerebellar medulloblastoma cells reduces cell viability, increases H2O2 levels, and increases susceptibility to ROS-triggered apoptosis; pan-neuronal/pan-glial Drosophila KD models show aberrant locomotor phenotypes and reduced survival under oxidative stress.","method":"Whole-exome sequencing; patient fibroblast functional assays (glutathione peroxidase activity, Seahorse respirometry); siRNA knockdown in tumor cells; in vivo Drosophila neuronal/glial KD models","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic loss-of-function confirmed by multiple functional assays in patient cells and model organisms, independently replicated across five families","pmids":["33889951"],"is_preprint":false},{"year":2022,"finding":"PRDX3 mRNA is modified by m6A and specifically interacts with m6A reader YTHDF3 (but not YTHDF1 or YTHDF2); YTHDF3 knockdown suppresses PRDX3 expression at the translational level in an m6A-dependent manner, affecting PRDX3-mediated suppression of HSC activation via the mitochondrial ROS/TGF-β1/Smad2/3 pathway.","method":"RNA pull-down/mass spectrometry; m6A modification assay; YTHDF1/2/3 knockdown experiments; m6A-dependent translation assay; hepatic stellate cell activation assays; AAV9-mediated in vivo KD and OE","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA pull-down/MS with functional YTHDF knockdown comparison, m6A-dependent translation validated, single lab, multiple orthogonal methods","pmids":["35779442"],"is_preprint":false},{"year":2022,"finding":"A novel PRDX3 missense mutation (p.D163E) impairs the mitochondrial ROS defense system; the mutant protein is unstable, forms aggregates, triggers unfolded protein responses via both mitochondria and ER, and causes severe mitochondrial morphological alterations (damaged membranes, cristae disorganization) and accumulation of lipid droplets.","method":"Whole-exome sequencing; expression in mouse primary cortical neurons and HeLa cells; correlative light electron microscopy; mitochondrial functional parameters; fibroblast PRDX3 expression analysis; biochemical stability assays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — structural/functional characterization of disease mutation in multiple cell types with electron microscopy, single lab","pmids":["35766882"],"is_preprint":false},{"year":2023,"finding":"During ferroptosis, mitochondrial lipid peroxides trigger PRDX3 hyperoxidation (converting catalytic Cys thiol to sulfinic or sulfonic acid); hyperoxidized PRDX3 then translocates from mitochondria to plasma membranes, where it inhibits cystine uptake, thereby promoting ferroptosis. This identifies hyperoxidized PRDX3 as a specific ferroptosis marker and establishes its membrane translocation as a pro-ferroptotic mechanism.","method":"In vitro ferroptosis assays; detection of PRDX3 hyperoxidation (SO2/3-PRDX3); subcellular fractionation and membrane localization; cystine uptake assay; in vivo mouse models of alcoholic and nonalcoholic fatty liver disease; immunohistochemistry","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical mechanism (hyperoxidation + translocation + cystine uptake inhibition) with in vitro and in vivo validation, multiple orthogonal methods","pmids":["37863053"],"is_preprint":false},{"year":2024,"finding":"TRIM39 (E3 ubiquitin ligase) directly interacts with PRDX3 and induces its ubiquitination-mediated proteasomal degradation via K48-linked ubiquitin chains at lysine residues K73 and K149, leading to ROS accumulation and increased inflammatory cytokine generation that aggravates renal fibrosis.","method":"Co-immunoprecipitation (direct interaction); ubiquitination site mapping (K73, K149); K48 chain linkage determination; TRIM39 knockdown in UUO mouse model and HK-2 cells; ROS and inflammatory cytokine assays","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction by Co-IP with site-specific ubiquitination mapping and in vivo KD model, single lab","pmids":["38195664"],"is_preprint":false},{"year":2024,"finding":"PRDX3 interacts with PINK1 to stabilize Parkin-mediated mitophagic flux; PRDX3 knockdown decreases PINK1 expression, accelerates mitochondrial quality control damage, and weakens the protective effect of SGLT2 inhibitor empagliflozin against diabetic nephropathy.","method":"PRDX3 overexpression (pcDNA3.1-PRDX3) and knockdown (siPrdx3); measurement of mitochondrial dynamics proteins (Mfn2, Drp1) and mitophagy proteins (PINK1, Parkin, LC3II, P62); in vivo diabetic mouse model","journal":"Biochemical pharmacology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — genetic OE/KD with defined pathway readouts, pathway placement by loss-of-function, single lab","pmids":["39983849"],"is_preprint":false},{"year":2024,"finding":"Human mitochondrial PRDX3 is dually localized to both the matrix and the intermembrane space (IMS) as soluble proteins; during import into the matrix, PRDX3 undergoes sequential proteolytic processing by mitochondrial processing peptidase (MPP) and mitochondrial intermediate peptidase (MIP); sorting to the IMS is dependent on the inner membrane peptidase (IMP) complex.","method":"Subfractionation of highly purified mitochondria from HEK293T cells with compartment markers; alkaline carbonate extraction; in organello import assays; heterologous expression in yeast; in silico analysis","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — subfractionation with markers, biochemical extraction, in organello import assays, and heterologous yeast expression—multiple orthogonal approaches in single study","pmids":["39591905"],"is_preprint":false},{"year":2024,"finding":"PRDX3 interacts with PINK1 in NPC cells (confirmed by co-immunoprecipitation and immunofluorescence); PRDX3 safeguards against apoptosis by sustaining PINK1/Parkin-dependent mitophagy clearance of damaged mitochondria, and PRDX3 knockdown suppresses NPC tumor growth in vivo.","method":"Co-immunoprecipitation; immunofluorescence co-localization; siRNA-mediated PRDX3 knockdown; mitophagy and apoptosis assays; xenograft tumor model","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP interaction validated with functional KD and in vivo tumor model, single lab","pmids":["40912394"],"is_preprint":false},{"year":2025,"finding":"KAT2A (succinyltransferase) interacts with PRDX3 and succinylates it at lysine K84; KAT2A knockdown inhibits PRDX3 succinylation at K84, enhances PRDX3 stability, and promotes M2 microglial polarization over M1. K84 mutation enhances the effect of wild-type PRDX3 on polarization.","method":"Co-immunoprecipitation; immunoprecipitation for succinylation; K84 site mutagenesis; KAT2A knockdown in BV2 cells and TBI mouse model; M1/M2 polarization marker quantification","journal":"Neurological research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct interaction and site-specific PTM mapped by mutagenesis with functional phenotype, single lab","pmids":["40457625"],"is_preprint":false},{"year":2025,"finding":"SIRT4 directly interacts with PRDX3 and deacetylates it at lysine K92; this deacetylation is required for SIRT4-mediated inhibition of ferroptosis in liver ischemia-reperfusion injury. Liver-specific SIRT4 overexpression is protective, while SIRT4 KO exacerbates liver injury and ferroptosis in a PRDX3-K92-deacetylation-dependent manner.","method":"Co-immunoprecipitation (SIRT4-PRDX3 interaction); site-specific K92 deacetylation mapping; SIRT4 KO and liver-specific OE mice; ferroptosis assays; ferrostatin-1 rescue; liver-targeted LNP-sirt4 mRNA delivery","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, KO/OE mice with rescue, site-specific mapping, single lab","pmids":["40765819"],"is_preprint":false},{"year":2025,"finding":"PRDX5 and PRDX3 cooperate in mitochondrial antioxidant defense during myogenesis: Prdx3-/-; Prdx5-/- double-knockout mice show accelerated muscle aging with increased mitochondrial H2O2 production, decreased muscle mass/strength, and elevated E3 ligases Atrogin1 and MuRF1 as early as 10 weeks; Prdx3 single KO reduces mitochondrial ATP production in myotubes.","method":"Prdx3-/-, Prdx5-/-, and double-KO mouse models; Seahorse OCR (mitochondrial ATP production); grip strength and treadmill performance; Atrogin1/MuRF1 expression; confocal/super-resolution microscopy of mitochondria","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO mice with multiple defined functional and metabolic phenotypes, single lab","pmids":["41147088"],"is_preprint":false},{"year":2026,"finding":"PPT1 (palmitoyl-protein thioesterase 1) is the depalmitoylase of PRDX3: PPT1 catalyzes depalmitoylation of PRDX3 at its catalytic cysteine C108, thereby sustaining PRDX3 antioxidant activity. Genetic or chemical inhibition of PPT1 increases PRDX3 S-palmitoylation, elevates mitochondrial ROS, and induces cytotoxicity in multiple myeloma cells.","method":"Co-immunoprecipitation; S-palmitoylation assay; site-specific C108 identification; genetic and chemical PPT1 inhibition; mtROS measurement; xenograft tumor model","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical identification of writer/eraser and catalytic cysteine site, with genetic and pharmacological KO/inhibition showing consistent phenotype, single lab","pmids":["41865945"],"is_preprint":false},{"year":2025,"finding":"ERβ (estrogen receptor β), stabilized by USP7-mediated deubiquitination, suppresses PRDX3 SUMOylation in NSCLC cells, thereby mitigating ROS accumulation and promoting osimertinib resistance; depletion of ERβ restores PRDX3 SUMOylation and reverses resistance.","method":"ERβ/USP7 Co-IP; PRDX3 SUMOylation assay; ERβ depletion in vitro and in vivo; ROS measurement; drug resistance (IC50) assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — SUMOylation assay with functional rescue, Co-IP, in vitro and in vivo validation, single lab","pmids":["38097136"],"is_preprint":false}],"current_model":"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that forms decameric toroids and functions as a thioredoxin-dependent peroxidase (using mt-Trx/TrxR2/NADPH) to scavenge H2O2 and organic hydroperoxides; its activity is regulated by multiple post-translational modifications—SIRT3- and SIRT4-mediated deacetylation at K253/K92 (activating), KAT2A-mediated succinylation at K84 (destabilizing), PPT1-mediated depalmitoylation at C108 (activating), TRIM39-mediated K48 ubiquitination at K73/K149 (degrading), and ERβ-suppressed SUMOylation—while its expression is transcriptionally driven by c-Myc and translationally regulated by YTHDF3-mediated m6A reading; during ferroptosis, lipid peroxides hyperoxidize PRDX3 at its catalytic cysteine (generating SO2/3-PRDX3) causing translocation from mitochondria to plasma membrane where it inhibits cystine uptake; PRDX3 also interacts with PINK1 to sustain mitophagy and with cyclophilin 18 and TNNI3K kinase to modulate their activities, and its biogenesis involves dual import into both the mitochondrial matrix (via MPP+MIP processing) and IMS (via IMP complex)."},"narrative":{"mechanistic_narrative":"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that serves as a primary thioredoxin-dependent scavenger of hydrogen peroxide and organic hydroperoxides in the mitochondrial compartment [PMID:9363753, PMID:12773537]. It assembles into a stable decameric toroid of five dimeric units linked by intermolecular disulfides between the catalytic Cys-47 of one subunit and Cys-168 of its neighbor, with Cys-47 being essential for peroxidase activity [PMID:12773537]; catalytic turnover is driven by the mitochondrial thioredoxin/thioredoxin-reductase/NADPH system [PMID:9363753]. The protein is dually targeted within mitochondria, processed into the matrix by MPP and MIP and sorted to the intermembrane space via the IMP complex [PMID:39591905]. Through this peroxidase activity PRDX3 protects mitochondrial macromolecules from oxidative damage in vivo, limiting ROS accumulation, protein carbonylation and DNA oxidation, and conferring tolerance to oxidative stress [PMID:9890990, PMID:17316558]; it preserves mitochondrial mass, membrane potential and ATP output, and protects mtDNA in part by shielding the uracil-DNA glycosylase UNG1 from LonP1-mediated degradation through a redox-dependent disulfide interaction [PMID:12011429, PMID:27480846, PMID:41147088]. PRDX3 expression and abundance are tightly controlled: it is a direct transcriptional target of c-Myc and is required for Myc-driven proliferation and transformation [PMID:12011429], and its translation is governed by YTHDF3 reading of m6A-modified PRDX3 mRNA [PMID:35779442]. Its activity and stability are set by a dense layer of post-translational modifications—SIRT3- and SIRT4-mediated deacetylation at K253 and K92 (activating and dimerization-promoting) [PMID:31655428, PMID:40765819], KAT2A succinylation at K84 (destabilizing) [PMID:40457625], PPT1-mediated depalmitoylation of the catalytic C108 (activating) [PMID:41865945], TRIM39-driven K48-linked ubiquitination at K73/K149 (degrading) [PMID:38195664], and SUMOylation suppressed by ERβ [PMID:38097136]. During ferroptosis, mitochondrial lipid peroxides hyperoxidize the catalytic cysteine to sulfinic/sulfonic acid, triggering PRDX3 translocation from mitochondria to the plasma membrane where it inhibits cystine uptake and promotes cell death [PMID:37863053]. PRDX3 also sustains PINK1/Parkin-dependent mitophagy [PMID:39983849, PMID:40912394] and binds partner proteins including cyclophilin 18, which stimulates its activity, and the kinase TNNI3K, which it inhibits [PMID:9545370, PMID:18205602]. Biallelic loss-of-function mutations in PRDX3 cause human cerebellar ataxia, with patient cells showing reduced glutathione peroxidase activity and impaired mitochondrial respiration [PMID:33889951].","teleology":[{"year":1995,"claim":"Established that the then-named SP-22 protein had intrinsic radical-scavenging and protein-protective activity, the first functional clue to an antioxidant role.","evidence":"In vitro radical scavenging and protection assays with purified protein in adrenal cortex mitochondria","pmids":["7654218"],"confidence":"Medium","gaps":["Did not define the catalytic mechanism or cofactor dependence","No identification of the physiological reducing system"]},{"year":1997,"claim":"Defined PRDX3 as a thioredoxin-dependent peroxide reductase, resolving how it catalytically reduces peroxides rather than acting as a passive scavenger.","evidence":"In vitro reconstitution with purified SP-22, mt-Trx, thioredoxin reductase and NADPH, with stoichiometric substrate consumption","pmids":["9363753"],"confidence":"High","gaps":["Structural basis of catalysis not addressed","Catalytic residue identity not yet mapped"]},{"year":2003,"claim":"Defined the quaternary structure and catalytic residue, establishing PRDX3 as a decameric 2-Cys peroxiredoxin with Cys-47 as the active site.","evidence":"Recombinant expression, cysteine-to-serine mutagenesis (C47S, C66S, C168S), activity assays and electron microscopy","pmids":["12773537"],"confidence":"High","gaps":["Did not address regulation of the oligomeric state in cells","Role of hyperoxidation not yet examined"]},{"year":2002,"claim":"Placed PRDX3 downstream of an oncogenic transcription factor by showing it is a direct c-Myc target required for transformation and mitochondrial maintenance.","evidence":"ChIP, mycER inducible system, c-myc-/- cells, mitochondrial mass/potential probes and loss-of-function assays","pmids":["12011429"],"confidence":"High","gaps":["Mechanism linking peroxidase activity to proliferation not dissected","No direct measure of mitochondrial H2O2 flux"]},{"year":2007,"claim":"Confirmed PRDX3 as a physiologically important ROS scavenger in vivo and defined its mitochondrial localization and stress-inducibility.","evidence":"Germline KO mouse with LPS lung injury, oxidative damage readouts (8-OHdG, carbonylation); immunofluorescence localization in lens epithelium","pmids":["17316558","17893648","9890990"],"confidence":"High","gaps":["Tissue-specific roles not separated","Upstream H2O2-sensing induction mechanism undefined"]},{"year":2007,"claim":"Identified protein partners that modulate PRDX3 activity, expanding its role beyond peroxide reduction to regulation of partner enzymes.","evidence":"Yeast two-hybrid, in vitro binding and kinase assays (TNNI3K); binding and activity-stimulation assays (cyclophilin 18)","pmids":["18205602","9545370"],"confidence":"Medium","gaps":["Physiological context of TNNI3K inhibition not established","Structural basis of cyclophilin 18 stimulation unknown"]},{"year":2016,"claim":"Connected PRDX3 to mtDNA integrity and mitochondrial energetics, showing it protects UNG1 from protease degradation and supports ATP synthesis.","evidence":"Stable knockdown, proteomics, ATP/invasion assays in HepG2; redox-dependent disulfide Co-IP with UNG1 and LonP1 analysis","pmids":["26983019","27480846"],"confidence":"Medium","gaps":["Reciprocal validation of UNG1 interaction limited","Causality between mtDNA protection and growth phenotype incomplete"]},{"year":2024,"claim":"Resolved PRDX3 biogenesis, establishing dual submitochondrial targeting to matrix and IMS via distinct processing pathways.","evidence":"Subfractionation with markers, carbonate extraction, in organello import and heterologous yeast expression","pmids":["39591905"],"confidence":"High","gaps":["Functional difference between matrix and IMS pools unknown","Regulation of sorting choice undefined"]},{"year":2020,"claim":"Defined a layer of activity control via reversible acetylation, showing SIRT3 deacetylation of K253 promotes dimerization and protects against hyperoxidation.","evidence":"SIRT3 KD/KO, K253R/K253Q mutagenesis, dimerization and apoptosis readouts, I/R models; SIRT3-PRDX3 Co-IP in beta cells","pmids":["31655428","32763411"],"confidence":"High","gaps":["Stoichiometry of endogenous acetylation unknown","Whether deacetylation directly versus indirectly affects catalysis unresolved"]},{"year":2021,"claim":"Established PRDX3 as a Mendelian disease gene, linking loss of its peroxidase function to human cerebellar ataxia and mitochondrial respiratory failure.","evidence":"Whole-exome sequencing across five families, patient fibroblast GPx and respirometry assays, tumor cell KD, Drosophila neuronal/glial models","pmids":["33889951","35766882"],"confidence":"High","gaps":["Tissue selectivity of cerebellar phenotype unexplained","Genotype-phenotype correlation across mutations incomplete"]},{"year":2022,"claim":"Showed PRDX3 abundance is set translationally through m6A reading, adding RNA-level control to its known transcriptional regulation.","evidence":"RNA pull-down/MS, YTHDF1/2/3 KD comparison, m6A-dependent translation assays, hepatic stellate cell and in vivo AAV9 models","pmids":["35779442"],"confidence":"Medium","gaps":["m6A site mapping on PRDX3 mRNA not detailed","Single-lab finding"]},{"year":2023,"claim":"Reframed PRDX3 as an active participant in ferroptosis, showing catalytic-cysteine hyperoxidation drives mitochondria-to-plasma-membrane translocation that inhibits cystine uptake.","evidence":"Ferroptosis assays, SO2/3-PRDX3 detection, subcellular fractionation, cystine uptake assay, fatty liver disease mouse models","pmids":["37863053"],"confidence":"High","gaps":["Mechanism of membrane translocation and targeting undefined","How membrane PRDX3 inhibits the cystine transporter unresolved"]},{"year":2024,"claim":"Defined ubiquitin- and mitophagy-coupled regulation, identifying TRIM39 as a degrading E3 ligase and PINK1 as a partner sustaining mitophagic flux.","evidence":"Co-IP, K48 ubiquitination site mapping (K73/K149) with renal fibrosis model; 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mitochondria.\",\n      \"method\": \"In vitro radical scavenging assay with Fe2+/dithiothreitol radical-generating system; biochemical protection assays with purified protein\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — direct in vitro biochemical assay with purified protein, single study, single lab\",\n      \"pmids\": [\"7654218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"SP-22 (PRDX3) functions as a thioredoxin-dependent peroxide reductase in mitochondria: in the presence of mitochondrial thioredoxin (mt-Trx), a partially purified thioredoxin reductase (NADPH-dependent Nbs2 reductase), and NADPH, SP-22 catalyzes the stoichiometric reduction of H2O2 and tert-butyl hydroperoxide with concomitant NADPH oxidation.\",\n      \"method\": \"In vitro reconstitution assay with purified/partially purified SP-22, mt-Trx, Nbs2 reductase, and NADPH; NADPH oxidation monitored concomitant with H2O2 disappearance; functional protection of oxyhemoglobin from ascorbate-induced damage\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — full enzymatic reconstitution with three purified components, stoichiometric substrate consumption measured, multiple functional readouts in single study\",\n      \"pmids\": [\"9363753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human T cell cyclophilin 18 (hCyP18) directly binds to PRDX3 (Aop1) and stimulates its enzymatic antioxidant activity; the interaction is specific, as other PPIases do not stimulate Aop1 activity.\",\n      \"method\": \"Protein-protein interaction assay (binding confirmed); enzymatic activity stimulation assay with hCyP18 and other PPIases as controls\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding and functional stimulation demonstrated, single lab, limited methodological detail in abstract\",\n      \"pmids\": [\"9545370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"SP-22 (PRDX3) functions as a mitochondrial antioxidant in cardiovascular endothelial cells: its expression is induced by oxidative stresses (including mitochondrial respiratory inhibitors that increase superoxide), and cells pre-treated with mild oxidative stress to increase SP-22 become tolerant to subsequent intense oxidative stress, while cells depleted of SP-22 by antisense oligodeoxynucleotide become more labile to oxidative stress.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown in bovine aortic endothelial cells; oxidative stress tolerance assays; SP-22 induction by respiratory inhibitors (antimycin A); in vivo induction in rat myocardial infarction model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (antisense KD) with defined phenotypic readout plus gain-of-function (preconditioning), replicated in vivo\",\n      \"pmids\": [\"9890990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PRDX3 is a transcriptional target of c-Myc: Myc binds preferentially to a ~930-bp region surrounding PRDX3 exon 1 (by ChIP), PRDX3 expression is induced by the mycER system and reduced in c-myc-/- cells, and PRDX3 is required for Myc-mediated proliferation, transformation, and apoptosis after glucose withdrawal. PRDX3 is also essential for maintaining mitochondrial mass and membrane potential in transformed cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) across entire PRDX3 genomic sequence; mycER inducible system; c-myc-/- cell lines; fluorescent mitochondrial probes (mass and membrane potential); loss-of-function proliferation and transformation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (ChIP, genetic KO, inducible system, functional assays), single lab but rigorous\",\n      \"pmids\": [\"12011429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Bovine mitochondrial SP-22 (PRDX3) is a 2-Cys peroxiredoxin that forms a stable decameric toroid of five basic dimeric units with intermolecular disulfide bonds linking catalytic Cys-47 of one subunit to Cys-168 of the adjacent monomer; Cys-47 is the catalytic residue (confirmed by C47S mutagenesis abolishing activity), while Cys-66 and Cys-168 are non-catalytic. The disulfide bonds are not required for overall structural integrity.\",\n      \"method\": \"Overexpression in E. coli; cysteine-to-serine mutagenesis (C47S, C66S, C168S); peroxidase activity assays; electron microscopy structural analysis of purified recombinant protein\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with active-site mutagenesis and structural characterization, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"12773537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"MER5/PRDX3 knockout mice accumulate significantly higher intracellular ROS levels in macrophages under basal conditions, and exhibit more severe LPS-induced lung injury (inflammatory cell infiltration, airway wall thickening, DNA oxidation as 8-OHdG, protein carbonylation) than wild-type mice, establishing PRDX3 as an important ROS scavenger in vivo.\",\n      \"method\": \"Germline knockout mouse model; intratracheal LPS inoculation; intracellular ROS measurement; 8-OHdG assay; protein carbonylation assay; histological analysis\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO mouse with defined cellular and tissue phenotype, multiple oxidative damage readouts\",\n      \"pmids\": [\"17316558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRDX3 is localized to the mitochondria in human lens epithelial cells and is specifically induced by low levels of H2O2 (as little as 2 µM) but not by TBHP or heat-shock, suggesting a specific H2O2-sensing induction mechanism in the lens.\",\n      \"method\": \"Immunofluorescence (mitochondrial co-localization); RT-PCR; Western blot; H2O2, TBHP, and heat-treatment comparisons in human lens epithelial cells and rat lenses\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization confirmed by immunofluorescence, specific H2O2 induction shown by controlled comparisons, single lab\",\n      \"pmids\": [\"17893648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRDX3 (AOP-1) directly interacts with cardiac troponin I-interacting kinase TNNI3K via TNNI3K's ANK motif, confirmed by yeast two-hybrid, in vitro binding assay, co-expression in vivo, and confocal immunofluorescence co-localization; co-expression of AOP-1 inhibits TNNI3K kinase activity in an in vitro kinase assay.\",\n      \"method\": \"Yeast two-hybrid screening of adult heart cDNA library; in vitro binding assay; co-expression in vivo; confocal immunofluorescence co-localization; in vitro kinase assay\",\n      \"journal\": \"Biochemistry. Biokhimiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by in vitro binding and in vivo co-expression plus functional kinase inhibition, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"18205602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Drosophila Prx3 (ortholog of human PRDX3) is required for oxidative stress resistance in adult flies: RNAi-mediated knockdown does not change phenotype under normal conditions but results in shorter survival in the presence of H2O2; Prx3 expression levels decline with aging, linking PRDX3 to age-dependent oxidative stress competence.\",\n      \"method\": \"RNAi-induced knockdown in Drosophila; H2O2 survival assay; expression level analysis across ages\",\n      \"journal\": \"Biomedical research (Tokyo, Japan)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vivo genetic KD with defined phenotypic readout (survival under oxidative stress), single lab, model organism ortholog\",\n      \"pmids\": [\"23124252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PRDX3 knockdown in HepG2 hepatocellular carcinoma cells increases mtDNA oxidation, decreases ATP synthase expression and cellular ATP levels (slowing growth), and enhances invasive properties via TIMP-1 down-regulation and increased ECM degradation.\",\n      \"method\": \"Stable PRDX3 knockdown cell lines; quantitative proteomics (differentially expressed proteins); cellular ATP measurement; invasion assays; TIMP-1 expression analysis\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable KD with multiple functional readouts (mtDNA oxidation, ATP, invasion, proteomics), single lab\",\n      \"pmids\": [\"26983019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Under oxidative stress (H2O2), PRDX3 interacts with UNG1 (mitochondrial uracil-DNA glycosylase isoform 1) via a disulfide linkage; this interaction protects UNG1 from ROS-mediated degradation by Lon protease 1 (LonP1) and prevents mtDNA oxidation. PRDX3 knockdown aggravates LonP1-dependent UNG1 degradation and mtDNA oxidation.\",\n      \"method\": \"Co-immunoprecipitation/proteomics under oxidative stress; disulfide linkage characterization; PRDX3 knockdown; Lon protease 1 interaction; mtDNA oxidation assay\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal IP with redox-specific disulfide linkage, KD with functional consequence, single lab\",\n      \"pmids\": [\"27480846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIRT3 deacetylates PRDX3 at lysine K253; acetylation of PRDX3 (increased by SIRT3 knockdown or sirtuin inhibition with nicotinamide) impairs its antioxidative activity and dimerization. The K253R (deacetylation-mimetic) mutation increases PRDX3 dimerization and protects against mitochondrial oxidative damage and apoptosis in I/R conditions, while K253Q (acetylation-mimetic) abolishes protection.\",\n      \"method\": \"SIRT3 knockdown; nicotinamide sirtuin inhibition; immunoprecipitation to identify acetylation site; K253R and K253Q mutagenesis; dimerization assay; mitochondrial damage and apoptosis readouts in vitro and in SIRT3 KO mice; intestinal I/R model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — site-specific mutagenesis (K253R, K253Q) with functional rescue/loss, KO mouse model, in vitro and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"31655428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Under high glucose conditions, PRDX3 is acetylated (mediated via SIRT1 degradation leading to SIRT3 inactivation), which promotes PRDX3 hyperoxidation, mitochondrial dysfunction, and beta-cell apoptosis via NOX-JNK-p66Shc signalosome activation; SIRT3 physically interacts with PRDX3 and deacetylates it, protecting against hyperoxidation.\",\n      \"method\": \"Co-immunoprecipitation (SIRT3-PRDX3 physical interaction); SIRT1 siRNA knockdown and inhibitor (EX-527); acetylation and hyperoxidation assays; apoptosis assays in INS-1 and 1.1B4 cells\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP for physical interaction, functional KD with signaling pathway readouts, single lab\",\n      \"pmids\": [\"32763411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic loss-of-function mutations in PRDX3 cause cerebellar ataxia in humans; patient fibroblasts lacking PRDX3 show decreased glutathione peroxidase activity and decreased mitochondrial maximal respiratory capacity; PRDX3 knockdown in cerebellar medulloblastoma cells reduces cell viability, increases H2O2 levels, and increases susceptibility to ROS-triggered apoptosis; pan-neuronal/pan-glial Drosophila KD models show aberrant locomotor phenotypes and reduced survival under oxidative stress.\",\n      \"method\": \"Whole-exome sequencing; patient fibroblast functional assays (glutathione peroxidase activity, Seahorse respirometry); siRNA knockdown in tumor cells; in vivo Drosophila neuronal/glial KD models\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic loss-of-function confirmed by multiple functional assays in patient cells and model organisms, independently replicated across five families\",\n      \"pmids\": [\"33889951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PRDX3 mRNA is modified by m6A and specifically interacts with m6A reader YTHDF3 (but not YTHDF1 or YTHDF2); YTHDF3 knockdown suppresses PRDX3 expression at the translational level in an m6A-dependent manner, affecting PRDX3-mediated suppression of HSC activation via the mitochondrial ROS/TGF-β1/Smad2/3 pathway.\",\n      \"method\": \"RNA pull-down/mass spectrometry; m6A modification assay; YTHDF1/2/3 knockdown experiments; m6A-dependent translation assay; hepatic stellate cell activation assays; AAV9-mediated in vivo KD and OE\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA pull-down/MS with functional YTHDF knockdown comparison, m6A-dependent translation validated, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"35779442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A novel PRDX3 missense mutation (p.D163E) impairs the mitochondrial ROS defense system; the mutant protein is unstable, forms aggregates, triggers unfolded protein responses via both mitochondria and ER, and causes severe mitochondrial morphological alterations (damaged membranes, cristae disorganization) and accumulation of lipid droplets.\",\n      \"method\": \"Whole-exome sequencing; expression in mouse primary cortical neurons and HeLa cells; correlative light electron microscopy; mitochondrial functional parameters; fibroblast PRDX3 expression analysis; biochemical stability assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — structural/functional characterization of disease mutation in multiple cell types with electron microscopy, single lab\",\n      \"pmids\": [\"35766882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"During ferroptosis, mitochondrial lipid peroxides trigger PRDX3 hyperoxidation (converting catalytic Cys thiol to sulfinic or sulfonic acid); hyperoxidized PRDX3 then translocates from mitochondria to plasma membranes, where it inhibits cystine uptake, thereby promoting ferroptosis. This identifies hyperoxidized PRDX3 as a specific ferroptosis marker and establishes its membrane translocation as a pro-ferroptotic mechanism.\",\n      \"method\": \"In vitro ferroptosis assays; detection of PRDX3 hyperoxidation (SO2/3-PRDX3); subcellular fractionation and membrane localization; cystine uptake assay; in vivo mouse models of alcoholic and nonalcoholic fatty liver disease; immunohistochemistry\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical mechanism (hyperoxidation + translocation + cystine uptake inhibition) with in vitro and in vivo validation, multiple orthogonal methods\",\n      \"pmids\": [\"37863053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM39 (E3 ubiquitin ligase) directly interacts with PRDX3 and induces its ubiquitination-mediated proteasomal degradation via K48-linked ubiquitin chains at lysine residues K73 and K149, leading to ROS accumulation and increased inflammatory cytokine generation that aggravates renal fibrosis.\",\n      \"method\": \"Co-immunoprecipitation (direct interaction); ubiquitination site mapping (K73, K149); K48 chain linkage determination; TRIM39 knockdown in UUO mouse model and HK-2 cells; ROS and inflammatory cytokine assays\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction by Co-IP with site-specific ubiquitination mapping and in vivo KD model, single lab\",\n      \"pmids\": [\"38195664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRDX3 interacts with PINK1 to stabilize Parkin-mediated mitophagic flux; PRDX3 knockdown decreases PINK1 expression, accelerates mitochondrial quality control damage, and weakens the protective effect of SGLT2 inhibitor empagliflozin against diabetic nephropathy.\",\n      \"method\": \"PRDX3 overexpression (pcDNA3.1-PRDX3) and knockdown (siPrdx3); measurement of mitochondrial dynamics proteins (Mfn2, Drp1) and mitophagy proteins (PINK1, Parkin, LC3II, P62); in vivo diabetic mouse model\",\n      \"journal\": \"Biochemical pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — genetic OE/KD with defined pathway readouts, pathway placement by loss-of-function, single lab\",\n      \"pmids\": [\"39983849\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Human mitochondrial PRDX3 is dually localized to both the matrix and the intermembrane space (IMS) as soluble proteins; during import into the matrix, PRDX3 undergoes sequential proteolytic processing by mitochondrial processing peptidase (MPP) and mitochondrial intermediate peptidase (MIP); sorting to the IMS is dependent on the inner membrane peptidase (IMP) complex.\",\n      \"method\": \"Subfractionation of highly purified mitochondria from HEK293T cells with compartment markers; alkaline carbonate extraction; in organello import assays; heterologous expression in yeast; in silico analysis\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — subfractionation with markers, biochemical extraction, in organello import assays, and heterologous yeast expression—multiple orthogonal approaches in single study\",\n      \"pmids\": [\"39591905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRDX3 interacts with PINK1 in NPC cells (confirmed by co-immunoprecipitation and immunofluorescence); PRDX3 safeguards against apoptosis by sustaining PINK1/Parkin-dependent mitophagy clearance of damaged mitochondria, and PRDX3 knockdown suppresses NPC tumor growth in vivo.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence co-localization; siRNA-mediated PRDX3 knockdown; mitophagy and apoptosis assays; xenograft tumor model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP interaction validated with functional KD and in vivo tumor model, single lab\",\n      \"pmids\": [\"40912394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KAT2A (succinyltransferase) interacts with PRDX3 and succinylates it at lysine K84; KAT2A knockdown inhibits PRDX3 succinylation at K84, enhances PRDX3 stability, and promotes M2 microglial polarization over M1. K84 mutation enhances the effect of wild-type PRDX3 on polarization.\",\n      \"method\": \"Co-immunoprecipitation; immunoprecipitation for succinylation; K84 site mutagenesis; KAT2A knockdown in BV2 cells and TBI mouse model; M1/M2 polarization marker quantification\",\n      \"journal\": \"Neurological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction and site-specific PTM mapped by mutagenesis with functional phenotype, single lab\",\n      \"pmids\": [\"40457625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SIRT4 directly interacts with PRDX3 and deacetylates it at lysine K92; this deacetylation is required for SIRT4-mediated inhibition of ferroptosis in liver ischemia-reperfusion injury. Liver-specific SIRT4 overexpression is protective, while SIRT4 KO exacerbates liver injury and ferroptosis in a PRDX3-K92-deacetylation-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation (SIRT4-PRDX3 interaction); site-specific K92 deacetylation mapping; SIRT4 KO and liver-specific OE mice; ferroptosis assays; ferrostatin-1 rescue; liver-targeted LNP-sirt4 mRNA delivery\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, KO/OE mice with rescue, site-specific mapping, single lab\",\n      \"pmids\": [\"40765819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRDX5 and PRDX3 cooperate in mitochondrial antioxidant defense during myogenesis: Prdx3-/-; Prdx5-/- double-knockout mice show accelerated muscle aging with increased mitochondrial H2O2 production, decreased muscle mass/strength, and elevated E3 ligases Atrogin1 and MuRF1 as early as 10 weeks; Prdx3 single KO reduces mitochondrial ATP production in myotubes.\",\n      \"method\": \"Prdx3-/-, Prdx5-/-, and double-KO mouse models; Seahorse OCR (mitochondrial ATP production); grip strength and treadmill performance; Atrogin1/MuRF1 expression; confocal/super-resolution microscopy of mitochondria\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO mice with multiple defined functional and metabolic phenotypes, single lab\",\n      \"pmids\": [\"41147088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PPT1 (palmitoyl-protein thioesterase 1) is the depalmitoylase of PRDX3: PPT1 catalyzes depalmitoylation of PRDX3 at its catalytic cysteine C108, thereby sustaining PRDX3 antioxidant activity. Genetic or chemical inhibition of PPT1 increases PRDX3 S-palmitoylation, elevates mitochondrial ROS, and induces cytotoxicity in multiple myeloma cells.\",\n      \"method\": \"Co-immunoprecipitation; S-palmitoylation assay; site-specific C108 identification; genetic and chemical PPT1 inhibition; mtROS measurement; xenograft tumor model\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical identification of writer/eraser and catalytic cysteine site, with genetic and pharmacological KO/inhibition showing consistent phenotype, single lab\",\n      \"pmids\": [\"41865945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ERβ (estrogen receptor β), stabilized by USP7-mediated deubiquitination, suppresses PRDX3 SUMOylation in NSCLC cells, thereby mitigating ROS accumulation and promoting osimertinib resistance; depletion of ERβ restores PRDX3 SUMOylation and reverses resistance.\",\n      \"method\": \"ERβ/USP7 Co-IP; PRDX3 SUMOylation assay; ERβ depletion in vitro and in vivo; ROS measurement; drug resistance (IC50) assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — SUMOylation assay with functional rescue, Co-IP, in vitro and in vivo validation, single lab\",\n      \"pmids\": [\"38097136\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that forms decameric toroids and functions as a thioredoxin-dependent peroxidase (using mt-Trx/TrxR2/NADPH) to scavenge H2O2 and organic hydroperoxides; its activity is regulated by multiple post-translational modifications—SIRT3- and SIRT4-mediated deacetylation at K253/K92 (activating), KAT2A-mediated succinylation at K84 (destabilizing), PPT1-mediated depalmitoylation at C108 (activating), TRIM39-mediated K48 ubiquitination at K73/K149 (degrading), and ERβ-suppressed SUMOylation—while its expression is transcriptionally driven by c-Myc and translationally regulated by YTHDF3-mediated m6A reading; during ferroptosis, lipid peroxides hyperoxidize PRDX3 at its catalytic cysteine (generating SO2/3-PRDX3) causing translocation from mitochondria to plasma membrane where it inhibits cystine uptake; PRDX3 also interacts with PINK1 to sustain mitophagy and with cyclophilin 18 and TNNI3K kinase to modulate their activities, and its biogenesis involves dual import into both the mitochondrial matrix (via MPP+MIP processing) and IMS (via IMP complex).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that serves as a primary thioredoxin-dependent scavenger of hydrogen peroxide and organic hydroperoxides in the mitochondrial compartment [#1, #5]. It assembles into a stable decameric toroid of five dimeric units linked by intermolecular disulfides between the catalytic Cys-47 of one subunit and Cys-168 of its neighbor, with Cys-47 being essential for peroxidase activity [#5]; catalytic turnover is driven by the mitochondrial thioredoxin/thioredoxin-reductase/NADPH system [#1]. The protein is dually targeted within mitochondria, processed into the matrix by MPP and MIP and sorted to the intermembrane space via the IMP complex [#20]. Through this peroxidase activity PRDX3 protects mitochondrial macromolecules from oxidative damage in vivo, limiting ROS accumulation, protein carbonylation and DNA oxidation, and conferring tolerance to oxidative stress [#3, #6]; it preserves mitochondrial mass, membrane potential and ATP output, and protects mtDNA in part by shielding the uracil-DNA glycosylase UNG1 from LonP1-mediated degradation through a redox-dependent disulfide interaction [#4, #11, #24]. PRDX3 expression and abundance are tightly controlled: it is a direct transcriptional target of c-Myc and is required for Myc-driven proliferation and transformation [#4], and its translation is governed by YTHDF3 reading of m6A-modified PRDX3 mRNA [#15]. Its activity and stability are set by a dense layer of post-translational modifications—SIRT3- and SIRT4-mediated deacetylation at K253 and K92 (activating and dimerization-promoting) [#12, #23], KAT2A succinylation at K84 (destabilizing) [#22], PPT1-mediated depalmitoylation of the catalytic C108 (activating) [#25], TRIM39-driven K48-linked ubiquitination at K73/K149 (degrading) [#18], and SUMOylation suppressed by ERβ [#26]. During ferroptosis, mitochondrial lipid peroxides hyperoxidize the catalytic cysteine to sulfinic/sulfonic acid, triggering PRDX3 translocation from mitochondria to the plasma membrane where it inhibits cystine uptake and promotes cell death [#17]. PRDX3 also sustains PINK1/Parkin-dependent mitophagy [#19, #21] and binds partner proteins including cyclophilin 18, which stimulates its activity, and the kinase TNNI3K, which it inhibits [#2, #8]. Biallelic loss-of-function mutations in PRDX3 cause human cerebellar ataxia, with patient cells showing reduced glutathione peroxidase activity and impaired mitochondrial respiration [#14].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"Established that the then-named SP-22 protein had intrinsic radical-scavenging and protein-protective activity, the first functional clue to an antioxidant role.\",\n      \"evidence\": \"In vitro radical scavenging and protection assays with purified protein in adrenal cortex mitochondria\",\n      \"pmids\": [\"7654218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not define the catalytic mechanism or cofactor dependence\", \"No identification of the physiological reducing system\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Defined PRDX3 as a thioredoxin-dependent peroxide reductase, resolving how it catalytically reduces peroxides rather than acting as a passive scavenger.\",\n      \"evidence\": \"In vitro reconstitution with purified SP-22, mt-Trx, thioredoxin reductase and NADPH, with stoichiometric substrate consumption\",\n      \"pmids\": [\"9363753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of catalysis not addressed\", \"Catalytic residue identity not yet mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the quaternary structure and catalytic residue, establishing PRDX3 as a decameric 2-Cys peroxiredoxin with Cys-47 as the active site.\",\n      \"evidence\": \"Recombinant expression, cysteine-to-serine mutagenesis (C47S, C66S, C168S), activity assays and electron microscopy\",\n      \"pmids\": [\"12773537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address regulation of the oligomeric state in cells\", \"Role of hyperoxidation not yet examined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placed PRDX3 downstream of an oncogenic transcription factor by showing it is a direct c-Myc target required for transformation and mitochondrial maintenance.\",\n      \"evidence\": \"ChIP, mycER inducible system, c-myc-/- cells, mitochondrial mass/potential probes and loss-of-function assays\",\n      \"pmids\": [\"12011429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking peroxidase activity to proliferation not dissected\", \"No direct measure of mitochondrial H2O2 flux\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Confirmed PRDX3 as a physiologically important ROS scavenger in vivo and defined its mitochondrial localization and stress-inducibility.\",\n      \"evidence\": \"Germline KO mouse with LPS lung injury, oxidative damage readouts (8-OHdG, carbonylation); immunofluorescence localization in lens epithelium\",\n      \"pmids\": [\"17316558\", \"17893648\", \"9890990\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific roles not separated\", \"Upstream H2O2-sensing induction mechanism undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified protein partners that modulate PRDX3 activity, expanding its role beyond peroxide reduction to regulation of partner enzymes.\",\n      \"evidence\": \"Yeast two-hybrid, in vitro binding and kinase assays (TNNI3K); binding and activity-stimulation assays (cyclophilin 18)\",\n      \"pmids\": [\"18205602\", \"9545370\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological context of TNNI3K inhibition not established\", \"Structural basis of cyclophilin 18 stimulation unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected PRDX3 to mtDNA integrity and mitochondrial energetics, showing it protects UNG1 from protease degradation and supports ATP synthesis.\",\n      \"evidence\": \"Stable knockdown, proteomics, ATP/invasion assays in HepG2; redox-dependent disulfide Co-IP with UNG1 and LonP1 analysis\",\n      \"pmids\": [\"26983019\", \"27480846\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Reciprocal validation of UNG1 interaction limited\", \"Causality between mtDNA protection and growth phenotype incomplete\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolved PRDX3 biogenesis, establishing dual submitochondrial targeting to matrix and IMS via distinct processing pathways.\",\n      \"evidence\": \"Subfractionation with markers, carbonate extraction, in organello import and heterologous yeast expression\",\n      \"pmids\": [\"39591905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional difference between matrix and IMS pools unknown\", \"Regulation of sorting choice undefined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a layer of activity control via reversible acetylation, showing SIRT3 deacetylation of K253 promotes dimerization and protects against hyperoxidation.\",\n      \"evidence\": \"SIRT3 KD/KO, K253R/K253Q mutagenesis, dimerization and apoptosis readouts, I/R models; SIRT3-PRDX3 Co-IP in beta cells\",\n      \"pmids\": [\"31655428\", \"32763411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of endogenous acetylation unknown\", \"Whether deacetylation directly versus indirectly affects catalysis unresolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Established PRDX3 as a Mendelian disease gene, linking loss of its peroxidase function to human cerebellar ataxia and mitochondrial respiratory failure.\",\n      \"evidence\": \"Whole-exome sequencing across five families, patient fibroblast GPx and respirometry assays, tumor cell KD, Drosophila neuronal/glial models\",\n      \"pmids\": [\"33889951\", \"35766882\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue selectivity of cerebellar phenotype unexplained\", \"Genotype-phenotype correlation across mutations incomplete\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed PRDX3 abundance is set translationally through m6A reading, adding RNA-level control to its known transcriptional regulation.\",\n      \"evidence\": \"RNA pull-down/MS, YTHDF1/2/3 KD comparison, m6A-dependent translation assays, hepatic stellate cell and in vivo AAV9 models\",\n      \"pmids\": [\"35779442\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"m6A site mapping on PRDX3 mRNA not detailed\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Reframed PRDX3 as an active participant in ferroptosis, showing catalytic-cysteine hyperoxidation drives mitochondria-to-plasma-membrane translocation that inhibits cystine uptake.\",\n      \"evidence\": \"Ferroptosis assays, SO2/3-PRDX3 detection, subcellular fractionation, cystine uptake assay, fatty liver disease mouse models\",\n      \"pmids\": [\"37863053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of membrane translocation and targeting undefined\", \"How membrane PRDX3 inhibits the cystine transporter unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined ubiquitin- and mitophagy-coupled regulation, identifying TRIM39 as a degrading E3 ligase and PINK1 as a partner sustaining mitophagic flux.\",\n      \"evidence\": \"Co-IP, K48 ubiquitination site mapping (K73/K149) with renal fibrosis model; PINK1 Co-IP and KD with mitophagy readouts in diabetic nephropathy and NPC models\",\n      \"pmids\": [\"38195664\", \"39983849\", \"40912394\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect PINK1 stabilization unresolved\", \"Single-lab findings without reciprocal cross-validation\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended PTM control to succinylation, depalmitoylation, second deacetylation site and SUMOylation, each tuning PRDX3 stability or activity in disease contexts.\",\n      \"evidence\": \"Co-IP and site mapping for KAT2A-K84, PPT1-C108, SIRT4-K92, ERβ-suppressed SUMOylation, with KO/OE and pharmacological models; Prdx3/Prdx5 double-KO muscle aging study\",\n      \"pmids\": [\"40457625\", \"41865945\", \"40765819\", \"38097136\", \"41147088\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-talk and hierarchy among the many PTMs unmapped\", \"Each modification characterized in a single disease context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the dense PTM network, dual submitochondrial localization, and ferroptotic translocation are integrated to set PRDX3 output under specific physiological conditions remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model of PTM hierarchy and crosstalk\", \"Functional distinction between matrix and IMS pools unknown\", \"Structural basis of hyperoxidation-triggered translocation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [0, 1, 3, 6]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [1, 5, 14]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 5]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [1, 5, 7, 20]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [17]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [17, 12]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [19, 21]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 10, 24]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PINK1\", \"TRIM39\", \"SIRT3\", \"SIRT4\", \"KAT2A\", \"PPT1\", \"UNG1\", \"TNNI3K\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}