{"gene":"PRDX3","run_date":"2026-04-28T19:45:45","timeline":{"discoveries":[{"year":1997,"finding":"SP-22 (PRDX3) is a thioredoxin-dependent peroxide reductase in mitochondria; in the presence of mitochondrial thioredoxin (mt-Trx), NADPH, and a mitochondrial thioredoxin reductase, SP-22 catalyzes the reduction of H2O2 and tert-butyl hydroperoxide with concomitant NADPH oxidation, establishing the three-component electron relay: thioredoxin reductase → mt-Trx → SP-22 → peroxide.","method":"In vitro reconstitution with purified SP-22, mt-Trx, and partially purified NADPH-dependent Nbs2 reductase; oxyhemoglobin protection assay; NADPH oxidation measured spectrophotometrically in the presence of H2O2 or t-BuOOH","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with three purified components; removal of any one component abolished activity","pmids":["9363753"],"is_preprint":false},{"year":1995,"finding":"SP-22 (PRDX3) functions as a radical scavenger in adrenocortical mitochondria, protecting radical-sensitive enzymes (tryptophan hydroxylase, glutamine synthetase, hemoglobin) from Fe²⁺/dithiothreitol-mediated oxidative damage; the protein was originally identified as a substrate of the mitochondrial ATP-dependent protease.","method":"In vitro radical-scavenging assay using Fe²⁺/dithiothreitol radical-generating system; enzyme activity protection assays with tryptophan hydroxylase and glutamine synthetase","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 in vitro assay, single lab, single paper","pmids":["7654218"],"is_preprint":false},{"year":2003,"finding":"Bovine SP-22 (PRDX3) is a 2-Cys peroxiredoxin organized as a decameric toroid of five dimeric units; Cys-47 is the catalytic (peroxidatic) cysteine and forms an intermolecular disulfide with Cys-168 of the adjacent monomer; Cys-66 is not required for activity. The disulfide bonds are not required for the toroidal quaternary structure.","method":"Recombinant expression of wild-type and Cys→Ser mutants (C47S, C66S, C168S) in E. coli; circular dichroism; electron microscopy; peroxidase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with active-site mutagenesis and structural (EM) validation","pmids":["12773537"],"is_preprint":false},{"year":2002,"finding":"PRDX3 is a transcriptional target of c-Myc; Myc binds the PRDX3 genomic region surrounding exon 1 (chromatin immunoprecipitation); PRDX3 is required for Myc-mediated cell proliferation, neoplastic transformation, and apoptosis after glucose withdrawal; PRDX3 is essential for maintaining mitochondrial mass and membrane potential in transformed cells.","method":"Chromatin immunoprecipitation (ChIP) across the PRDX3 genomic locus; mycER induction system; PRDX3 knockdown/overexpression; mitochondria-specific fluorescent probes (JC-1, MitoTracker); transformation assays in rat and human cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — ChIP plus multiple functional assays (transformation, apoptosis, mitochondrial imaging) in two cell types","pmids":["12011429"],"is_preprint":false},{"year":1999,"finding":"SP-22 (PRDX3) expression in bovine aortic endothelial cells is induced 1.5–4.6-fold by mitochondrial oxidative stresses (Fe²⁺/dithiothreitol, antimycin A, respiratory inhibitors); antisense depletion of SP-22 increases cellular lability to oxidative stress, and preconditioning with mild oxidative stress (which raises SP-22) confers tolerance to subsequent intense stress; SP-22 induction also occurs in vivo in rat myocardial infarction.","method":"Antisense oligodeoxynucleotide knockdown; oxidative stress tolerance assays; RT-PCR and western blot for mRNA and protein; in vivo rat myocardial infarction model","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with specific oxidative-stress phenotype, replicated in vivo","pmids":["9890990"],"is_preprint":false},{"year":2007,"finding":"PRDX3 (MER5) knockout mice show significantly elevated intracellular ROS in macrophages and increased susceptibility to LPS-induced lung inflammation, oxidative DNA damage (8-OHdG), and protein carbonylation, establishing PRDX3 as a required ROS scavenger in vivo.","method":"MER5/PRDX3 knockout mouse model; intratracheal LPS challenge; flow cytometry for intracellular ROS; 8-OHdG and protein carbonyl immunohistochemistry","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — clean knockout with multiple orthogonal phenotypic readouts in vivo","pmids":["17316558"],"is_preprint":false},{"year":2007,"finding":"PRDX3 is localized to mitochondria in human lens epithelial cells and is specifically and selectively induced by H2O2 (as low as 2 µM) but not by tert-butyl hydroperoxide or heat shock, indicating a specific sensor/effector role for H2O2 in the lens.","method":"Immunofluorescence localization; RT-PCR and western blot; comparison of H2O2 vs. TBHP vs. heat-shock treatments in human lens epithelial cells and whole rat lenses","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 2 — direct localization with functional specificity demonstrated by orthogonal stress comparisons","pmids":["17893648"],"is_preprint":false},{"year":1998,"finding":"Human T cell cyclophilin18 (hCyP18) physically interacts with the thiol-specific antioxidant protein Aop1 (PRDX3 family member) and stimulates its enzymatic activity; the stimulation is specific to CyP18 and not observed with other PPIases.","method":"Yeast two-hybrid; co-immunoprecipitation; in vitro binding assay; enzymatic activity stimulation assay","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal binding and functional enzyme stimulation demonstrated","pmids":["9545370"],"is_preprint":false},{"year":2007,"finding":"Antioxidant protein 1 (AOP-1/PRDX3) physically interacts with the cardiac-specific kinase TNNI3K via the ANK motif of TNNI3K, and co-expression of AOP-1 inhibits TNNI3K kinase activity in an in vitro kinase assay.","method":"Yeast two-hybrid screening; in vitro binding assay; co-immunoprecipitation in vivo; confocal immunofluorescence co-localization; in vitro kinase assay","journal":"Biochemistry. Biokhimiia","confidence":"Medium","confidence_rationale":"Tier 2 — confirmed by multiple methods including functional kinase inhibition assay","pmids":["18205602"],"is_preprint":false},{"year":2019,"finding":"SIRT3 directly deacetylates PRDX3 at lysine K253; acetylation of K253 impairs PRDX3 dimerization and antioxidative activity, while the deacetylation-mimicking K253R mutation enhances dimerization and mitochondrial protection. SIRT3 knockdown increases PRDX3 acetylation; inhibition of SIRTs by nicotinamide does not further increase PRDX3 acetylation in SIRT3-knockdown cells, confirming SIRT3 as the specific deacetylase.","method":"Immunoprecipitation to identify acetylation site; SIRT3 knockdown; nicotinamide inhibition; K253R and K253Q site-directed mutants; dimerization assay; mitochondrial ROS and apoptosis readouts; SIRT3 knockout mouse model of I/R injury","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 — site-specific mutagenesis + genetic KO + enzymatic activity, multiple orthogonal approaches","pmids":["31655428"],"is_preprint":false},{"year":2020,"finding":"High glucose conditions increase PRDX3 acetylation via SIRT1 degradation, which impairs SIRT3 activity toward PRDX3, leading to PRDX3 hyper-oxidation and mitochondrial dysfunction in pancreatic β-cells; SIRT3 physically interacts with PRDX3 as shown by co-immunoprecipitation, and activated SIRT3 prevents PRDX3 acetylation and hyper-oxidation.","method":"Co-immunoprecipitation (SIRT3-PRDX3 interaction); SIRT1 knockdown/inhibition (EX-527/siRNA); SIRT3 activity measurement; PRDX3 acetylation western blot; ROS and apoptosis assays in INS-1 and 1.1B4 cells","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional deacetylation assay, single lab","pmids":["32763411"],"is_preprint":false},{"year":2016,"finding":"Under oxidative stress, PRDX3 binds to UNG1 (mitochondrial uracil-DNA glycosylase isoform 1) via a disulfide linkage, protecting UNG1 from ROS-mediated Lon protease 1 (LonP1)-dependent degradation and preventing mtDNA oxidation; PRDX3 knockdown aggravates UNG1 degradation.","method":"Proteomics/mass spectrometry to identify UNG1 binding partners; co-immunoprecipitation under oxidative stress; PRDX3 siRNA knockdown; LonP1 inhibition assay; mtDNA oxidation measurement","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 — mass spectrometry-identified interaction confirmed by Co-IP, with defined functional consequence","pmids":["27480846"],"is_preprint":false},{"year":2023,"finding":"During ferroptosis, mitochondrial lipid peroxides trigger PRDX3 hyperoxidation (conversion of catalytic Cys to sulfinic/sulfonic acid); hyperoxidized PRDX3 translocates from mitochondria to the plasma membrane where it inhibits cystine uptake, amplifying ferroptosis. This identifies hyperoxidized PRDX3 as a specific ferroptosis marker and reveals a mechanism linking mitochondrial peroxide metabolism to cystine transport.","method":"In vitro ferroptosis induction; subcellular fractionation and immunofluorescence for PRDX3 translocation; cystine uptake assay; in vivo mouse models of alcoholic and non-alcoholic fatty liver disease; hyperoxidized PRDX3 antibody-based detection","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (fractionation, live imaging, functional uptake assay, in vivo models), published in high-impact journal","pmids":["37863053"],"is_preprint":false},{"year":2022,"finding":"PRDX3 mRNA is modified by m6A and the m6A reader YTHDF3 (but not YTHDF1 or YTHDF2) directly regulates PRDX3 translation in an m6A-dependent manner; PRDX3 suppresses hepatic stellate cell activation at least partially via the mitochondrial ROS/TGF-β1/Smad2/3 pathway.","method":"RNA pull-down/mass spectrometry to identify m6A readers interacting with PRDX3 mRNA; YTHDF1-3 individual knockdown; AAV9-mediated PRDX3 knockdown/overexpression in mice; ROS measurement; TGF-β1/Smad2/3 pathway analysis","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 — RNA pulldown/MS with functional knockdown validation, in vivo confirmation","pmids":["35779442"],"is_preprint":false},{"year":2021,"finding":"Biallelic loss-of-function mutations in PRDX3 cause autosomal recessive cerebellar ataxia (SCAR32); patient fibroblasts lacking PRDX3 show decreased glutathione peroxidase activity and decreased mitochondrial maximal respiratory capacity; PRDX3 knockdown in cerebellar medulloblastoma cells increases H2O2 and apoptosis susceptibility; pan-neuronal/glial Drosophila knockdown causes locomotor defects and reduced survival under oxidative stress.","method":"Whole-genome/exome sequencing; patient fibroblast functional assays (respiratory capacity, GPx activity); siRNA knockdown in DAOY cells; Drosophila pan-neuronal/glial RNAi model with locomotor and survival assays","journal":"Brain : a journal of neurology","confidence":"High","confidence_rationale":"Tier 2 — human genetics validated by patient cell biochemistry and ortholog animal model with multiple functional readouts","pmids":["33889951"],"is_preprint":false},{"year":2022,"finding":"The PRDX3 p.D163E missense mutation causes protein instability, aggregate formation, and triggers unfolded protein responses via both mitochondrial and endoplasmic reticulum pathways; in HeLa cells expressing the mutation, mitochondria show severe membrane and cristae disorganization and lipid droplet accumulation; neurite morphology is altered in primary cortical neurons expressing the mutant.","method":"Whole exome sequencing; heterologous expression in HeLa cells; correlative light-electron microscopy (CLEM); mitochondrial functional parameters; biochemical aggregation assays; patient fibroblast analysis","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 1-2 — structural/ultrastructural validation plus functional assays in patient and model cells","pmids":["35766882"],"is_preprint":false},{"year":2023,"finding":"ERβ suppresses PRDX3 SUMOylation, thereby reducing ROS accumulation and promoting osimertinib resistance in NSCLC; USP7 deubiquitinates and stabilizes ERβ, positioning the USP7–ERβ–PRDX3 SUMOylation axis as a resistance mechanism.","method":"Co-immunoprecipitation; SUMOylation assay; siRNA knockdown of ERβ and PRDX3; ROS measurement; in vitro and in vivo drug resistance assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional SUMOylation assay with in vivo validation, single lab","pmids":["38097136"],"is_preprint":false},{"year":2024,"finding":"The E3 ubiquitin ligase TRIM39 directly interacts with PRDX3 and induces its proteasomal degradation via K48-linked ubiquitination at lysine residues K73 and K149, leading to ROS accumulation and inflammatory cytokine production that aggravates renal fibrosis.","method":"Co-immunoprecipitation (TRIM39-PRDX3 interaction); ubiquitination assay with K48-linkage specificity; site-directed mutagenesis of K73 and K149; TRIM39 knockdown in UUO mice and HK-2 cells; ROS and cytokine measurement","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus site-specific ubiquitination mapping and in vivo functional validation","pmids":["38195664"],"is_preprint":false},{"year":2024,"finding":"Human PRDX3 undergoes dual submitochondrial localization: it is imported into the matrix via sequential cleavage by mitochondrial processing peptidase (MPP) and mitochondrial intermediate peptidase (MIP), and is also sorted to the intermembrane space (IMS) via the inner membrane peptidase (IMP) complex; both isoforms are soluble proteins.","method":"Subfractionation of highly purified HEK293T mitochondria; alkaline carbonate extraction; in organello import assays; heterologous yeast expression with IMP complex mutants; in silico presequence analysis","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 1-2 — reconstitution in organello import + genetic dissection of import machinery in yeast + biochemical fractionation","pmids":["39591905"],"is_preprint":false},{"year":2025,"finding":"SIRT4 physically interacts with PRDX3 and deacetylates it specifically at lysine K92; SIRT4 knockout exacerbates ferroptosis in liver ischemia-reperfusion injury, and this exacerbation is dependent on PRDX3 deacetylation at K92, as demonstrated by K92 mutant rescue experiments.","method":"Co-immunoprecipitation (SIRT4-PRDX3); site-directed mutagenesis (K92); SIRT4 knockout and liver-specific overexpression mouse models; ferroptosis inhibitor ferrostatin-1 rescue; liver-targeted LNP-mRNA delivery","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with site-specific mutagenesis and in vivo genetic models, single lab","pmids":["40765819"],"is_preprint":false},{"year":2026,"finding":"PPT1 is the depalmitoylase of PRDX3, catalyzing depalmitoylation at the catalytic cysteine C108; S-palmitoylation of C108 by PPT1 substrates inhibits PRDX3 antioxidant activity; genetic or chemical inhibition of PPT1 elevates PRDX3 S-palmitoylation, increases mitochondrial ROS, and induces cytotoxicity in multiple myeloma cells.","method":"Co-immunoprecipitation; palmitoylation assay (acyl-RAC); site-directed mutagenesis (C108); PPT1 genetic/chemical inhibition; xenograft tumor model; mitochondrial ROS measurement","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP plus palmitoylation site mutagenesis and in vivo xenograft validation, single lab","pmids":["41865945"],"is_preprint":false},{"year":2025,"finding":"KAT2A (a succinyltransferase) interacts with PRDX3 and succinylates it at K84; KAT2A knockdown inhibits PRDX3 succinylation at K84, enhancing PRDX3 stability and promoting microglial M2 polarization over M1. K84 succinylation-mimetic mutation abolishes this polarization effect.","method":"Co-immunoprecipitation; succinylation immunoprecipitation; K84 site mutagenesis; KAT2A knockdown in LPS-activated BV2 cells and TBI mouse model; microglial polarization markers by qPCR","journal":"Neurological research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP with site-specific PTM mapping, functional rescue by mutagenesis, in vivo TBI model","pmids":["40457625"],"is_preprint":false},{"year":2024,"finding":"PRDX3 interacts with PINK1 to stabilize Parkin-mediated mitophagy flux in nasopharyngeal carcinoma cells; PRDX3 knockdown disrupts PINK1/Parkin-dependent mitophagy, causing mitochondrial lipid peroxidation and apoptosis.","method":"Co-immunoprecipitation (PRDX3-PINK1); immunofluorescence co-localization; siRNA knockdown; mitophagy, ROS, and apoptosis assays; xenograft model","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus functional mitophagy assay and in vivo validation, single lab","pmids":["40912394"],"is_preprint":false},{"year":2024,"finding":"YAP1 transcriptionally activates PRDX3 expression by directly interacting with TEAD1 at the PRDX3 promoter; forced Prdx3 expression inhibits alveolar epithelial cell senescence and mitochondrial dysfunction, and Prdx3 knockdown partially abrogates the anti-fibrotic effects of YAP1 overexpression.","method":"ChIP assay (YAP1-TEAD1 interaction at PRDX3 promoter); AAV-mediated overexpression/knockdown; cell senescence markers; mitochondrial function assays; bleomycin-induced fibrosis model in vivo","journal":"Experimental & molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus genetic epistasis in vivo and in vitro, single lab","pmids":["38945958"],"is_preprint":false}],"current_model":"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that uses a thioredoxin/thioredoxin-reductase/NADPH electron relay to reduce H2O2 and lipid hydroperoxides via its catalytic Cys-47 (forming a disulfide with Cys-168); it assembles into a decameric toroid, undergoes dual import into the matrix (via MPP/MIP) and intermembrane space (via IMP), is transcriptionally induced by c-Myc and YAP1–TEAD1, and is post-translationally regulated by SIRT3- and SIRT4-mediated deacetylation (at K253 and K92, respectively), KAT2A-mediated succinylation (at K84), ERβ-mediated suppression of SUMOylation, TRIM39-mediated K48 ubiquitination/degradation (at K73/K149), and PPT1-mediated depalmitoylation (at C108); during ferroptosis, lipid-peroxide-driven hyperoxidation of its catalytic Cys converts it to sulfinic/sulfonic acid, triggering translocation to the plasma membrane where it inhibits cystine uptake, and it also interacts with UNG1 (protecting mitochondrial DNA repair) and PINK1 (supporting Parkin-mediated mitophagy)."},"narrative":{"teleology":[{"year":1995,"claim":"The initial identification of SP-22 (PRDX3) as a mitochondrial radical scavenger established that this protein directly protects radical-sensitive enzymes from oxidative inactivation, raising the question of its enzymatic mechanism.","evidence":"In vitro radical-scavenging assay using Fe²⁺/DTT radical-generating system with enzyme activity protection readouts in bovine adrenal mitochondria","pmids":["7654218"],"confidence":"Medium","gaps":["Catalytic mechanism unknown","Electron donor not identified","Single radical-generating system tested"]},{"year":1997,"claim":"Reconstitution of the three-component electron relay (thioredoxin reductase → mitochondrial thioredoxin → SP-22 → peroxide) resolved the catalytic mechanism by which PRDX3 reduces H₂O₂ and organic hydroperoxides, establishing it as a bona fide thioredoxin-dependent peroxidase.","evidence":"In vitro reconstitution with purified SP-22, mt-Trx, and NADPH-dependent reductase; NADPH oxidation spectrophotometry","pmids":["9363753"],"confidence":"High","gaps":["Active-site residues not yet mapped","Quaternary structure unknown","Relative contribution versus glutathione peroxidase unclear"]},{"year":1999,"claim":"Demonstrating that PRDX3 is stress-inducible and required for cellular tolerance to oxidative injury extended its role from a constitutive enzyme to a regulated stress-response factor, including in vivo during myocardial infarction.","evidence":"Antisense knockdown in endothelial cells; oxidative stress tolerance assays; in vivo rat MI model","pmids":["9890990"],"confidence":"Medium","gaps":["Transcriptional regulators driving induction not identified","Mechanism of stress sensing not defined"]},{"year":2002,"claim":"Identification of PRDX3 as a direct transcriptional target of c-Myc linked mitochondrial antioxidant capacity to oncogenic signaling, showing PRDX3 is required for Myc-driven transformation and mitochondrial membrane potential maintenance.","evidence":"ChIP at PRDX3 locus; MycER induction; knockdown/overexpression with transformation and mitochondrial imaging assays in rat and human cells","pmids":["12011429"],"confidence":"High","gaps":["Whether Myc regulation is direct at the promoter or enhancer not fully resolved","Post-translational regulation by Myc pathway not examined"]},{"year":2003,"claim":"Structural and mutational analysis revealed that PRDX3 assembles as a decameric toroid and identified Cys-47 as the peroxidatic cysteine forming an intermolecular disulfide with Cys-168, defining the 2-Cys peroxiredoxin mechanism.","evidence":"Recombinant WT and Cys→Ser mutants; electron microscopy; circular dichroism; peroxidase activity assays","pmids":["12773537"],"confidence":"High","gaps":["High-resolution atomic structure not available","Dynamics of dimer–decamer transitions under redox cycling not characterized"]},{"year":2007,"claim":"PRDX3 knockout mice demonstrated that PRDX3 is a non-redundant ROS scavenger in vivo, as loss causes elevated macrophage ROS, oxidative DNA damage, and increased susceptibility to inflammatory injury.","evidence":"PRDX3 knockout mouse; intratracheal LPS challenge; flow cytometry for ROS; 8-OHdG and protein carbonyl immunohistochemistry","pmids":["17316558"],"confidence":"High","gaps":["Neurological phenotype in knockout not examined at this stage","Compensation by other peroxiredoxins not assessed"]},{"year":2016,"claim":"Discovery of a redox-dependent disulfide interaction between PRDX3 and UNG1 revealed that PRDX3 protects mitochondrial DNA repair capacity by shielding UNG1 from LonP1-mediated degradation under oxidative stress.","evidence":"Proteomics/MS identification of UNG1 as PRDX3 partner; Co-IP under oxidative stress; PRDX3 siRNA; LonP1 inhibition; mtDNA oxidation measurement","pmids":["27480846"],"confidence":"Medium","gaps":["Stoichiometry and structural basis of disulfide linkage not defined","Whether interaction is constitutive or only stress-induced unclear","Single study without independent replication"]},{"year":2019,"claim":"Identification of SIRT3 as the specific deacetylase of PRDX3 at K253, with acetylation impairing dimerization and antioxidative activity, revealed the first defined post-translational regulatory switch controlling PRDX3 function.","evidence":"IP-based acetylation site mapping; SIRT3 knockdown and nicotinamide inhibition; K253R/Q mutagenesis; SIRT3 KO mouse ischemia-reperfusion model","pmids":["31655428"],"confidence":"High","gaps":["Acetyltransferase responsible for K253 acetylation not identified","Whether other SIRT3 substrates mediate overlapping protection unclear"]},{"year":2021,"claim":"The discovery that biallelic PRDX3 loss-of-function mutations cause SCAR32 established PRDX3 as essential for cerebellar neuron survival, linking mitochondrial peroxide detoxification to neurodegeneration in humans.","evidence":"WGS/WES in patient families; patient fibroblast functional assays; PRDX3 knockdown in medulloblastoma cells; Drosophila pan-neuronal RNAi","pmids":["33889951"],"confidence":"High","gaps":["Cerebellar selectivity of neurodegeneration not mechanistically explained","No mouse SCAR32 model generated"]},{"year":2022,"claim":"The PRDX3 D163E missense mutation was shown to cause protein aggregation and trigger both mitochondrial and ER unfolded protein responses, providing a gain-of-toxic-function mechanism for PRDX3-linked ataxia beyond simple loss of peroxidase activity.","evidence":"Heterologous expression in HeLa; CLEM ultrastructural analysis; aggregation assays; patient fibroblast analysis; primary cortical neuron morphology","pmids":["35766882"],"confidence":"Medium","gaps":["Whether aggregation occurs in patient neurons in vivo not shown","Relative contributions of loss-of-function versus gain-of-toxic-function not dissected"]},{"year":2023,"claim":"The finding that lipid-peroxide-driven hyperoxidation of PRDX3 triggers its translocation from mitochondria to the plasma membrane, where it inhibits cystine uptake, established a non-canonical signaling function linking mitochondrial redox state to ferroptosis amplification.","evidence":"Ferroptosis induction; subcellular fractionation and immunofluorescence; cystine uptake assay; in vivo fatty liver disease models; hyperoxidized PRDX3-specific antibody","pmids":["37863053"],"confidence":"High","gaps":["Mechanism of translocation from mitochondria to plasma membrane unknown","Direct molecular target at the plasma membrane mediating cystine uptake inhibition not identified"]},{"year":2024,"claim":"Resolution of dual submitochondrial targeting showed PRDX3 is sorted to both the matrix (via MPP/MIP) and the intermembrane space (via IMP), indicating distinct functional pools within mitochondria.","evidence":"Subfractionation of purified HEK293T mitochondria; alkaline carbonate extraction; in organello import; yeast IMP complex mutants","pmids":["39591905"],"confidence":"High","gaps":["Functional role of IMS-localized PRDX3 not characterized","Relative stoichiometry of matrix versus IMS pools unknown"]},{"year":2024,"claim":"Multiple post-translational regulatory axes were mapped — TRIM39-mediated K48 ubiquitination at K73/K149, ERβ suppression of SUMOylation, PRDX3–PINK1 interaction supporting mitophagy, and YAP1–TEAD1 transcriptional activation — revealing the breadth of regulatory inputs converging on PRDX3 abundance and activity.","evidence":"Co-IP, site-directed mutagenesis, ubiquitination/SUMOylation assays, ChIP, xenograft and fibrosis models across multiple studies","pmids":["38195664","38097136","40912394","38945958"],"confidence":"Medium","gaps":["Cross-talk between ubiquitination, SUMOylation, and acetylation on the same molecule not examined","Many interactions validated only by Co-IP in a single lab"]},{"year":2025,"claim":"Identification of SIRT4 as a second sirtuin deacetylating PRDX3 at K92 and KAT2A as the succinylase at K84 expanded the PTM code governing PRDX3, linking specific modifications to ferroptosis susceptibility and microglial polarization respectively.","evidence":"Co-IP, K92/K84 site mutagenesis, SIRT4 KO mice with liver I/R, KAT2A knockdown in TBI model with microglial polarization markers","pmids":["40765819","40457625"],"confidence":"Medium","gaps":["Interplay between K92 deacetylation and K253 deacetylation not examined","Single-lab findings for each modification"]},{"year":null,"claim":"Key unresolved questions include the mechanism by which hyperoxidized PRDX3 translocates to the plasma membrane, the identity of the plasma membrane target through which it inhibits cystine uptake, the functional significance of the IMS-localized pool, high-resolution structural dynamics of the decamer under redox cycling, and how the multiple overlapping PTMs (acetylation, succinylation, SUMOylation, ubiquitination, palmitoylation) are integrated to tune PRDX3 activity in vivo.","evidence":"","pmids":[],"confidence":"Low","gaps":["Mechanism of mitochondria-to-plasma membrane translocation unknown","Direct cystine transporter target at plasma membrane not identified","Functional role of IMS pool not defined","No high-resolution structure of human PRDX3 decamer","Integrated PTM crosstalk model absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016209","term_label":"antioxidant activity","supporting_discovery_ids":[0,1,2,5]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,2]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,1,2,6,18]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[0,1,4,5,9]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[12,19]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[9,17,21]}],"complexes":[],"partners":["SIRT3","SIRT4","TRIM39","PINK1","UNG1","PPT1","KAT2A","TNNI3K"],"other_free_text":[]},"mechanistic_narrative":"PRDX3 is a mitochondrial 2-Cys peroxiredoxin that functions as a principal scavenger of hydrogen peroxide and organic hydroperoxides, using a thioredoxin/thioredoxin-reductase/NADPH electron relay to reduce peroxides via its catalytic Cys-47, which forms an intermolecular disulfide with Cys-168 within a decameric toroidal assembly [PMID:9363753, PMID:12773537]. PRDX3 is imported into both the mitochondrial matrix (via MPP/MIP cleavage) and the intermembrane space (via the IMP complex), is transcriptionally induced by c-Myc and YAP1–TEAD1, and is subject to extensive post-translational regulation including SIRT3-mediated deacetylation at K253, SIRT4-mediated deacetylation at K92, KAT2A-mediated succinylation at K84, TRIM39-mediated K48-linked ubiquitination at K73/K149, and PPT1-mediated depalmitoylation at C108 [PMID:39591905, PMID:12011429, PMID:38945958, PMID:31655428, PMID:40765819, PMID:40457625, PMID:38195664, PMID:41865945]. During ferroptosis, lipid-peroxide-driven hyperoxidation of the catalytic cysteine triggers PRDX3 translocation from mitochondria to the plasma membrane, where it inhibits cystine uptake and amplifies ferroptotic cell death [PMID:37863053]. Biallelic loss-of-function mutations in PRDX3 cause autosomal recessive spinocerebellar ataxia (SCAR32), with patient cells showing impaired mitochondrial respiration and elevated oxidative damage [PMID:33889951]."},"prefetch_data":{"uniprot":{"accession":"P30048","full_name":"Thioredoxin-dependent peroxide reductase, mitochondrial","aliases":["Antioxidant protein 1","AOP-1","HBC189","Peroxiredoxin III","Prx-III","Peroxiredoxin-3","Protein MER5 homolog","Thioredoxin-dependent peroxiredoxin 3"],"length_aa":256,"mass_kda":27.7,"function":"Thiol-specific peroxidase that catalyzes the reduction of hydrogen peroxide and organic hydroperoxides to water and alcohols, respectively. Plays a role in cell protection against oxidative stress by detoxifying peroxides (PubMed:17707404, PubMed:29438714, PubMed:33889951, PubMed:7733872). Acts synergistically with MAP3K13 to regulate the activation of NF-kappa-B in the cytosol (PubMed:12492477). 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cavernosum","date":"2025-05-09","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.05.652305","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":39306,"output_tokens":6635,"usd":0.108721},"stage2":{"model":"claude-opus-4-6","input_tokens":10268,"output_tokens":3798,"usd":0.219435},"total_usd":0.328156,"stage1_batch_id":"msgbatch_01SUR8NDzVrNmyszWyJeCct7","stage2_batch_id":"msgbatch_01G7Yfutko3cDWzejrwH5AMx","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1997,\n      \"finding\": \"SP-22 (PRDX3) is a thioredoxin-dependent peroxide reductase in mitochondria; in the presence of mitochondrial thioredoxin (mt-Trx), NADPH, and a mitochondrial thioredoxin reductase, SP-22 catalyzes the reduction of H2O2 and tert-butyl hydroperoxide with concomitant NADPH oxidation, establishing the three-component electron relay: thioredoxin reductase → mt-Trx → SP-22 → peroxide.\",\n      \"method\": \"In vitro reconstitution with purified SP-22, mt-Trx, and partially purified NADPH-dependent Nbs2 reductase; oxyhemoglobin protection assay; NADPH oxidation measured spectrophotometrically in the presence of H2O2 or t-BuOOH\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with three purified components; removal of any one component abolished activity\",\n      \"pmids\": [\"9363753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"SP-22 (PRDX3) functions as a radical scavenger in adrenocortical mitochondria, protecting radical-sensitive enzymes (tryptophan hydroxylase, glutamine synthetase, hemoglobin) from Fe²⁺/dithiothreitol-mediated oxidative damage; the protein was originally identified as a substrate of the mitochondrial ATP-dependent protease.\",\n      \"method\": \"In vitro radical-scavenging assay using Fe²⁺/dithiothreitol radical-generating system; enzyme activity protection assays with tryptophan hydroxylase and glutamine synthetase\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 in vitro assay, single lab, single paper\",\n      \"pmids\": [\"7654218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Bovine SP-22 (PRDX3) is a 2-Cys peroxiredoxin organized as a decameric toroid of five dimeric units; Cys-47 is the catalytic (peroxidatic) cysteine and forms an intermolecular disulfide with Cys-168 of the adjacent monomer; Cys-66 is not required for activity. The disulfide bonds are not required for the toroidal quaternary structure.\",\n      \"method\": \"Recombinant expression of wild-type and Cys→Ser mutants (C47S, C66S, C168S) in E. coli; circular dichroism; electron microscopy; peroxidase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with active-site mutagenesis and structural (EM) validation\",\n      \"pmids\": [\"12773537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"PRDX3 is a transcriptional target of c-Myc; Myc binds the PRDX3 genomic region surrounding exon 1 (chromatin immunoprecipitation); PRDX3 is required for Myc-mediated cell proliferation, neoplastic transformation, and apoptosis after glucose withdrawal; PRDX3 is essential for maintaining mitochondrial mass and membrane potential in transformed cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) across the PRDX3 genomic locus; mycER induction system; PRDX3 knockdown/overexpression; mitochondria-specific fluorescent probes (JC-1, MitoTracker); transformation assays in rat and human cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus multiple functional assays (transformation, apoptosis, mitochondrial imaging) in two cell types\",\n      \"pmids\": [\"12011429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"SP-22 (PRDX3) expression in bovine aortic endothelial cells is induced 1.5–4.6-fold by mitochondrial oxidative stresses (Fe²⁺/dithiothreitol, antimycin A, respiratory inhibitors); antisense depletion of SP-22 increases cellular lability to oxidative stress, and preconditioning with mild oxidative stress (which raises SP-22) confers tolerance to subsequent intense stress; SP-22 induction also occurs in vivo in rat myocardial infarction.\",\n      \"method\": \"Antisense oligodeoxynucleotide knockdown; oxidative stress tolerance assays; RT-PCR and western blot for mRNA and protein; in vivo rat myocardial infarction model\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific oxidative-stress phenotype, replicated in vivo\",\n      \"pmids\": [\"9890990\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRDX3 (MER5) knockout mice show significantly elevated intracellular ROS in macrophages and increased susceptibility to LPS-induced lung inflammation, oxidative DNA damage (8-OHdG), and protein carbonylation, establishing PRDX3 as a required ROS scavenger in vivo.\",\n      \"method\": \"MER5/PRDX3 knockout mouse model; intratracheal LPS challenge; flow cytometry for intracellular ROS; 8-OHdG and protein carbonyl immunohistochemistry\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean knockout with multiple orthogonal phenotypic readouts in vivo\",\n      \"pmids\": [\"17316558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PRDX3 is localized to mitochondria in human lens epithelial cells and is specifically and selectively induced by H2O2 (as low as 2 µM) but not by tert-butyl hydroperoxide or heat shock, indicating a specific sensor/effector role for H2O2 in the lens.\",\n      \"method\": \"Immunofluorescence localization; RT-PCR and western blot; comparison of H2O2 vs. TBHP vs. heat-shock treatments in human lens epithelial cells and whole rat lenses\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct localization with functional specificity demonstrated by orthogonal stress comparisons\",\n      \"pmids\": [\"17893648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Human T cell cyclophilin18 (hCyP18) physically interacts with the thiol-specific antioxidant protein Aop1 (PRDX3 family member) and stimulates its enzymatic activity; the stimulation is specific to CyP18 and not observed with other PPIases.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; in vitro binding assay; enzymatic activity stimulation assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal binding and functional enzyme stimulation demonstrated\",\n      \"pmids\": [\"9545370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Antioxidant protein 1 (AOP-1/PRDX3) physically interacts with the cardiac-specific kinase TNNI3K via the ANK motif of TNNI3K, and co-expression of AOP-1 inhibits TNNI3K kinase activity in an in vitro kinase assay.\",\n      \"method\": \"Yeast two-hybrid screening; in vitro binding assay; co-immunoprecipitation in vivo; confocal immunofluorescence co-localization; in vitro kinase assay\",\n      \"journal\": \"Biochemistry. Biokhimiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — confirmed by multiple methods including functional kinase inhibition assay\",\n      \"pmids\": [\"18205602\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SIRT3 directly deacetylates PRDX3 at lysine K253; acetylation of K253 impairs PRDX3 dimerization and antioxidative activity, while the deacetylation-mimicking K253R mutation enhances dimerization and mitochondrial protection. SIRT3 knockdown increases PRDX3 acetylation; inhibition of SIRTs by nicotinamide does not further increase PRDX3 acetylation in SIRT3-knockdown cells, confirming SIRT3 as the specific deacetylase.\",\n      \"method\": \"Immunoprecipitation to identify acetylation site; SIRT3 knockdown; nicotinamide inhibition; K253R and K253Q site-directed mutants; dimerization assay; mitochondrial ROS and apoptosis readouts; SIRT3 knockout mouse model of I/R injury\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — site-specific mutagenesis + genetic KO + enzymatic activity, multiple orthogonal approaches\",\n      \"pmids\": [\"31655428\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"High glucose conditions increase PRDX3 acetylation via SIRT1 degradation, which impairs SIRT3 activity toward PRDX3, leading to PRDX3 hyper-oxidation and mitochondrial dysfunction in pancreatic β-cells; SIRT3 physically interacts with PRDX3 as shown by co-immunoprecipitation, and activated SIRT3 prevents PRDX3 acetylation and hyper-oxidation.\",\n      \"method\": \"Co-immunoprecipitation (SIRT3-PRDX3 interaction); SIRT1 knockdown/inhibition (EX-527/siRNA); SIRT3 activity measurement; PRDX3 acetylation western blot; ROS and apoptosis assays in INS-1 and 1.1B4 cells\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional deacetylation assay, single lab\",\n      \"pmids\": [\"32763411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Under oxidative stress, PRDX3 binds to UNG1 (mitochondrial uracil-DNA glycosylase isoform 1) via a disulfide linkage, protecting UNG1 from ROS-mediated Lon protease 1 (LonP1)-dependent degradation and preventing mtDNA oxidation; PRDX3 knockdown aggravates UNG1 degradation.\",\n      \"method\": \"Proteomics/mass spectrometry to identify UNG1 binding partners; co-immunoprecipitation under oxidative stress; PRDX3 siRNA knockdown; LonP1 inhibition assay; mtDNA oxidation measurement\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mass spectrometry-identified interaction confirmed by Co-IP, with defined functional consequence\",\n      \"pmids\": [\"27480846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"During ferroptosis, mitochondrial lipid peroxides trigger PRDX3 hyperoxidation (conversion of catalytic Cys to sulfinic/sulfonic acid); hyperoxidized PRDX3 translocates from mitochondria to the plasma membrane where it inhibits cystine uptake, amplifying ferroptosis. This identifies hyperoxidized PRDX3 as a specific ferroptosis marker and reveals a mechanism linking mitochondrial peroxide metabolism to cystine transport.\",\n      \"method\": \"In vitro ferroptosis induction; subcellular fractionation and immunofluorescence for PRDX3 translocation; cystine uptake assay; in vivo mouse models of alcoholic and non-alcoholic fatty liver disease; hyperoxidized PRDX3 antibody-based detection\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (fractionation, live imaging, functional uptake assay, in vivo models), published in high-impact journal\",\n      \"pmids\": [\"37863053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"PRDX3 mRNA is modified by m6A and the m6A reader YTHDF3 (but not YTHDF1 or YTHDF2) directly regulates PRDX3 translation in an m6A-dependent manner; PRDX3 suppresses hepatic stellate cell activation at least partially via the mitochondrial ROS/TGF-β1/Smad2/3 pathway.\",\n      \"method\": \"RNA pull-down/mass spectrometry to identify m6A readers interacting with PRDX3 mRNA; YTHDF1-3 individual knockdown; AAV9-mediated PRDX3 knockdown/overexpression in mice; ROS measurement; TGF-β1/Smad2/3 pathway analysis\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RNA pulldown/MS with functional knockdown validation, in vivo confirmation\",\n      \"pmids\": [\"35779442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Biallelic loss-of-function mutations in PRDX3 cause autosomal recessive cerebellar ataxia (SCAR32); patient fibroblasts lacking PRDX3 show decreased glutathione peroxidase activity and decreased mitochondrial maximal respiratory capacity; PRDX3 knockdown in cerebellar medulloblastoma cells increases H2O2 and apoptosis susceptibility; pan-neuronal/glial Drosophila knockdown causes locomotor defects and reduced survival under oxidative stress.\",\n      \"method\": \"Whole-genome/exome sequencing; patient fibroblast functional assays (respiratory capacity, GPx activity); siRNA knockdown in DAOY cells; Drosophila pan-neuronal/glial RNAi model with locomotor and survival assays\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics validated by patient cell biochemistry and ortholog animal model with multiple functional readouts\",\n      \"pmids\": [\"33889951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The PRDX3 p.D163E missense mutation causes protein instability, aggregate formation, and triggers unfolded protein responses via both mitochondrial and endoplasmic reticulum pathways; in HeLa cells expressing the mutation, mitochondria show severe membrane and cristae disorganization and lipid droplet accumulation; neurite morphology is altered in primary cortical neurons expressing the mutant.\",\n      \"method\": \"Whole exome sequencing; heterologous expression in HeLa cells; correlative light-electron microscopy (CLEM); mitochondrial functional parameters; biochemical aggregation assays; patient fibroblast analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — structural/ultrastructural validation plus functional assays in patient and model cells\",\n      \"pmids\": [\"35766882\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ERβ suppresses PRDX3 SUMOylation, thereby reducing ROS accumulation and promoting osimertinib resistance in NSCLC; USP7 deubiquitinates and stabilizes ERβ, positioning the USP7–ERβ–PRDX3 SUMOylation axis as a resistance mechanism.\",\n      \"method\": \"Co-immunoprecipitation; SUMOylation assay; siRNA knockdown of ERβ and PRDX3; ROS measurement; in vitro and in vivo drug resistance assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional SUMOylation assay with in vivo validation, single lab\",\n      \"pmids\": [\"38097136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The E3 ubiquitin ligase TRIM39 directly interacts with PRDX3 and induces its proteasomal degradation via K48-linked ubiquitination at lysine residues K73 and K149, leading to ROS accumulation and inflammatory cytokine production that aggravates renal fibrosis.\",\n      \"method\": \"Co-immunoprecipitation (TRIM39-PRDX3 interaction); ubiquitination assay with K48-linkage specificity; site-directed mutagenesis of K73 and K149; TRIM39 knockdown in UUO mice and HK-2 cells; ROS and cytokine measurement\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus site-specific ubiquitination mapping and in vivo functional validation\",\n      \"pmids\": [\"38195664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Human PRDX3 undergoes dual submitochondrial localization: it is imported into the matrix via sequential cleavage by mitochondrial processing peptidase (MPP) and mitochondrial intermediate peptidase (MIP), and is also sorted to the intermembrane space (IMS) via the inner membrane peptidase (IMP) complex; both isoforms are soluble proteins.\",\n      \"method\": \"Subfractionation of highly purified HEK293T mitochondria; alkaline carbonate extraction; in organello import assays; heterologous yeast expression with IMP complex mutants; in silico presequence analysis\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstitution in organello import + genetic dissection of import machinery in yeast + biochemical fractionation\",\n      \"pmids\": [\"39591905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SIRT4 physically interacts with PRDX3 and deacetylates it specifically at lysine K92; SIRT4 knockout exacerbates ferroptosis in liver ischemia-reperfusion injury, and this exacerbation is dependent on PRDX3 deacetylation at K92, as demonstrated by K92 mutant rescue experiments.\",\n      \"method\": \"Co-immunoprecipitation (SIRT4-PRDX3); site-directed mutagenesis (K92); SIRT4 knockout and liver-specific overexpression mouse models; ferroptosis inhibitor ferrostatin-1 rescue; liver-targeted LNP-mRNA delivery\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with site-specific mutagenesis and in vivo genetic models, single lab\",\n      \"pmids\": [\"40765819\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"PPT1 is the depalmitoylase of PRDX3, catalyzing depalmitoylation at the catalytic cysteine C108; S-palmitoylation of C108 by PPT1 substrates inhibits PRDX3 antioxidant activity; genetic or chemical inhibition of PPT1 elevates PRDX3 S-palmitoylation, increases mitochondrial ROS, and induces cytotoxicity in multiple myeloma cells.\",\n      \"method\": \"Co-immunoprecipitation; palmitoylation assay (acyl-RAC); site-directed mutagenesis (C108); PPT1 genetic/chemical inhibition; xenograft tumor model; mitochondrial ROS measurement\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus palmitoylation site mutagenesis and in vivo xenograft validation, single lab\",\n      \"pmids\": [\"41865945\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"KAT2A (a succinyltransferase) interacts with PRDX3 and succinylates it at K84; KAT2A knockdown inhibits PRDX3 succinylation at K84, enhancing PRDX3 stability and promoting microglial M2 polarization over M1. K84 succinylation-mimetic mutation abolishes this polarization effect.\",\n      \"method\": \"Co-immunoprecipitation; succinylation immunoprecipitation; K84 site mutagenesis; KAT2A knockdown in LPS-activated BV2 cells and TBI mouse model; microglial polarization markers by qPCR\",\n      \"journal\": \"Neurological research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP with site-specific PTM mapping, functional rescue by mutagenesis, in vivo TBI model\",\n      \"pmids\": [\"40457625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PRDX3 interacts with PINK1 to stabilize Parkin-mediated mitophagy flux in nasopharyngeal carcinoma cells; PRDX3 knockdown disrupts PINK1/Parkin-dependent mitophagy, causing mitochondrial lipid peroxidation and apoptosis.\",\n      \"method\": \"Co-immunoprecipitation (PRDX3-PINK1); immunofluorescence co-localization; siRNA knockdown; mitophagy, ROS, and apoptosis assays; xenograft model\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus functional mitophagy assay and in vivo validation, single lab\",\n      \"pmids\": [\"40912394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"YAP1 transcriptionally activates PRDX3 expression by directly interacting with TEAD1 at the PRDX3 promoter; forced Prdx3 expression inhibits alveolar epithelial cell senescence and mitochondrial dysfunction, and Prdx3 knockdown partially abrogates the anti-fibrotic effects of YAP1 overexpression.\",\n      \"method\": \"ChIP assay (YAP1-TEAD1 interaction at PRDX3 promoter); AAV-mediated overexpression/knockdown; cell senescence markers; mitochondrial function assays; bleomycin-induced fibrosis model in vivo\",\n      \"journal\": \"Experimental & molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus genetic epistasis in vivo and in vitro, single lab\",\n      \"pmids\": [\"38945958\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PRDX3 is a mitochondria-localized 2-Cys peroxiredoxin that uses a thioredoxin/thioredoxin-reductase/NADPH electron relay to reduce H2O2 and lipid hydroperoxides via its catalytic Cys-47 (forming a disulfide with Cys-168); it assembles into a decameric toroid, undergoes dual import into the matrix (via MPP/MIP) and intermembrane space (via IMP), is transcriptionally induced by c-Myc and YAP1–TEAD1, and is post-translationally regulated by SIRT3- and SIRT4-mediated deacetylation (at K253 and K92, respectively), KAT2A-mediated succinylation (at K84), ERβ-mediated suppression of SUMOylation, TRIM39-mediated K48 ubiquitination/degradation (at K73/K149), and PPT1-mediated depalmitoylation (at C108); during ferroptosis, lipid-peroxide-driven hyperoxidation of its catalytic Cys converts it to sulfinic/sulfonic acid, triggering translocation to the plasma membrane where it inhibits cystine uptake, and it also interacts with UNG1 (protecting mitochondrial DNA repair) and PINK1 (supporting Parkin-mediated mitophagy).\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PRDX3 is a mitochondrial 2-Cys peroxiredoxin that functions as a principal scavenger of hydrogen peroxide and organic hydroperoxides, using a thioredoxin/thioredoxin-reductase/NADPH electron relay to reduce peroxides via its catalytic Cys-47, which forms an intermolecular disulfide with Cys-168 within a decameric toroidal assembly [PMID:9363753, PMID:12773537]. PRDX3 is imported into both the mitochondrial matrix (via MPP/MIP cleavage) and the intermembrane space (via the IMP complex), is transcriptionally induced by c-Myc and YAP1–TEAD1, and is subject to extensive post-translational regulation including SIRT3-mediated deacetylation at K253, SIRT4-mediated deacetylation at K92, KAT2A-mediated succinylation at K84, TRIM39-mediated K48-linked ubiquitination at K73/K149, and PPT1-mediated depalmitoylation at C108 [PMID:39591905, PMID:12011429, PMID:38945958, PMID:31655428, PMID:40765819, PMID:40457625, PMID:38195664, PMID:41865945]. During ferroptosis, lipid-peroxide-driven hyperoxidation of the catalytic cysteine triggers PRDX3 translocation from mitochondria to the plasma membrane, where it inhibits cystine uptake and amplifies ferroptotic cell death [PMID:37863053]. Biallelic loss-of-function mutations in PRDX3 cause autosomal recessive spinocerebellar ataxia (SCAR32), with patient cells showing impaired mitochondrial respiration and elevated oxidative damage [PMID:33889951].\",\n  \"teleology\": [\n    {\n      \"year\": 1995,\n      \"claim\": \"The initial identification of SP-22 (PRDX3) as a mitochondrial radical scavenger established that this protein directly protects radical-sensitive enzymes from oxidative inactivation, raising the question of its enzymatic mechanism.\",\n      \"evidence\": \"In vitro radical-scavenging assay using Fe²⁺/DTT radical-generating system with enzyme activity protection readouts in bovine adrenal mitochondria\",\n      \"pmids\": [\"7654218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Catalytic mechanism unknown\", \"Electron donor not identified\", \"Single radical-generating system tested\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Reconstitution of the three-component electron relay (thioredoxin reductase → mitochondrial thioredoxin → SP-22 → peroxide) resolved the catalytic mechanism by which PRDX3 reduces H₂O₂ and organic hydroperoxides, establishing it as a bona fide thioredoxin-dependent peroxidase.\",\n      \"evidence\": \"In vitro reconstitution with purified SP-22, mt-Trx, and NADPH-dependent reductase; NADPH oxidation spectrophotometry\",\n      \"pmids\": [\"9363753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Active-site residues not yet mapped\", \"Quaternary structure unknown\", \"Relative contribution versus glutathione peroxidase unclear\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that PRDX3 is stress-inducible and required for cellular tolerance to oxidative injury extended its role from a constitutive enzyme to a regulated stress-response factor, including in vivo during myocardial infarction.\",\n      \"evidence\": \"Antisense knockdown in endothelial cells; oxidative stress tolerance assays; in vivo rat MI model\",\n      \"pmids\": [\"9890990\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcriptional regulators driving induction not identified\", \"Mechanism of stress sensing not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of PRDX3 as a direct transcriptional target of c-Myc linked mitochondrial antioxidant capacity to oncogenic signaling, showing PRDX3 is required for Myc-driven transformation and mitochondrial membrane potential maintenance.\",\n      \"evidence\": \"ChIP at PRDX3 locus; MycER induction; knockdown/overexpression with transformation and mitochondrial imaging assays in rat and human cells\",\n      \"pmids\": [\"12011429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Myc regulation is direct at the promoter or enhancer not fully resolved\", \"Post-translational regulation by Myc pathway not examined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Structural and mutational analysis revealed that PRDX3 assembles as a decameric toroid and identified Cys-47 as the peroxidatic cysteine forming an intermolecular disulfide with Cys-168, defining the 2-Cys peroxiredoxin mechanism.\",\n      \"evidence\": \"Recombinant WT and Cys→Ser mutants; electron microscopy; circular dichroism; peroxidase activity assays\",\n      \"pmids\": [\"12773537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution atomic structure not available\", \"Dynamics of dimer–decamer transitions under redox cycling not characterized\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"PRDX3 knockout mice demonstrated that PRDX3 is a non-redundant ROS scavenger in vivo, as loss causes elevated macrophage ROS, oxidative DNA damage, and increased susceptibility to inflammatory injury.\",\n      \"evidence\": \"PRDX3 knockout mouse; intratracheal LPS challenge; flow cytometry for ROS; 8-OHdG and protein carbonyl immunohistochemistry\",\n      \"pmids\": [\"17316558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neurological phenotype in knockout not examined at this stage\", \"Compensation by other peroxiredoxins not assessed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovery of a redox-dependent disulfide interaction between PRDX3 and UNG1 revealed that PRDX3 protects mitochondrial DNA repair capacity by shielding UNG1 from LonP1-mediated degradation under oxidative stress.\",\n      \"evidence\": \"Proteomics/MS identification of UNG1 as PRDX3 partner; Co-IP under oxidative stress; PRDX3 siRNA; LonP1 inhibition; mtDNA oxidation measurement\",\n      \"pmids\": [\"27480846\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and structural basis of disulfide linkage not defined\", \"Whether interaction is constitutive or only stress-induced unclear\", \"Single study without independent replication\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of SIRT3 as the specific deacetylase of PRDX3 at K253, with acetylation impairing dimerization and antioxidative activity, revealed the first defined post-translational regulatory switch controlling PRDX3 function.\",\n      \"evidence\": \"IP-based acetylation site mapping; SIRT3 knockdown and nicotinamide inhibition; K253R/Q mutagenesis; SIRT3 KO mouse ischemia-reperfusion model\",\n      \"pmids\": [\"31655428\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Acetyltransferase responsible for K253 acetylation not identified\", \"Whether other SIRT3 substrates mediate overlapping protection unclear\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The discovery that biallelic PRDX3 loss-of-function mutations cause SCAR32 established PRDX3 as essential for cerebellar neuron survival, linking mitochondrial peroxide detoxification to neurodegeneration in humans.\",\n      \"evidence\": \"WGS/WES in patient families; patient fibroblast functional assays; PRDX3 knockdown in medulloblastoma cells; Drosophila pan-neuronal RNAi\",\n      \"pmids\": [\"33889951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cerebellar selectivity of neurodegeneration not mechanistically explained\", \"No mouse SCAR32 model generated\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The PRDX3 D163E missense mutation was shown to cause protein aggregation and trigger both mitochondrial and ER unfolded protein responses, providing a gain-of-toxic-function mechanism for PRDX3-linked ataxia beyond simple loss of peroxidase activity.\",\n      \"evidence\": \"Heterologous expression in HeLa; CLEM ultrastructural analysis; aggregation assays; patient fibroblast analysis; primary cortical neuron morphology\",\n      \"pmids\": [\"35766882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether aggregation occurs in patient neurons in vivo not shown\", \"Relative contributions of loss-of-function versus gain-of-toxic-function not dissected\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The finding that lipid-peroxide-driven hyperoxidation of PRDX3 triggers its translocation from mitochondria to the plasma membrane, where it inhibits cystine uptake, established a non-canonical signaling function linking mitochondrial redox state to ferroptosis amplification.\",\n      \"evidence\": \"Ferroptosis induction; subcellular fractionation and immunofluorescence; cystine uptake assay; in vivo fatty liver disease models; hyperoxidized PRDX3-specific antibody\",\n      \"pmids\": [\"37863053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of translocation from mitochondria to plasma membrane unknown\", \"Direct molecular target at the plasma membrane mediating cystine uptake inhibition not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Resolution of dual submitochondrial targeting showed PRDX3 is sorted to both the matrix (via MPP/MIP) and the intermembrane space (via IMP), indicating distinct functional pools within mitochondria.\",\n      \"evidence\": \"Subfractionation of purified HEK293T mitochondria; alkaline carbonate extraction; in organello import; yeast IMP complex mutants\",\n      \"pmids\": [\"39591905\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of IMS-localized PRDX3 not characterized\", \"Relative stoichiometry of matrix versus IMS pools unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Multiple post-translational regulatory axes were mapped — TRIM39-mediated K48 ubiquitination at K73/K149, ERβ suppression of SUMOylation, PRDX3–PINK1 interaction supporting mitophagy, and YAP1–TEAD1 transcriptional activation — revealing the breadth of regulatory inputs converging on PRDX3 abundance and activity.\",\n      \"evidence\": \"Co-IP, site-directed mutagenesis, ubiquitination/SUMOylation assays, ChIP, xenograft and fibrosis models across multiple studies\",\n      \"pmids\": [\"38195664\", \"38097136\", \"40912394\", \"38945958\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cross-talk between ubiquitination, SUMOylation, and acetylation on the same molecule not examined\", \"Many interactions validated only by Co-IP in a single lab\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identification of SIRT4 as a second sirtuin deacetylating PRDX3 at K92 and KAT2A as the succinylase at K84 expanded the PTM code governing PRDX3, linking specific modifications to ferroptosis susceptibility and microglial polarization respectively.\",\n      \"evidence\": \"Co-IP, K92/K84 site mutagenesis, SIRT4 KO mice with liver I/R, KAT2A knockdown in TBI model with microglial polarization markers\",\n      \"pmids\": [\"40765819\", \"40457625\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interplay between K92 deacetylation and K253 deacetylation not examined\", \"Single-lab findings for each modification\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the mechanism by which hyperoxidized PRDX3 translocates to the plasma membrane, the identity of the plasma membrane target through which it inhibits cystine uptake, the functional significance of the IMS-localized pool, high-resolution structural dynamics of the decamer under redox cycling, and how the multiple overlapping PTMs (acetylation, succinylation, SUMOylation, ubiquitination, palmitoylation) are integrated to tune PRDX3 activity in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanism of mitochondria-to-plasma membrane translocation unknown\", \"Direct cystine transporter target at plasma membrane not identified\", \"Functional role of IMS pool not defined\", \"No high-resolution structure of human PRDX3 decamer\", \"Integrated PTM crosstalk model absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [0, 1, 2, 5]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 1, 2, 6, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [0, 1, 4, 5, 9]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [12, 19]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [9, 17, 21]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SIRT3\",\n      \"SIRT4\",\n      \"TRIM39\",\n      \"PINK1\",\n      \"UNG1\",\n      \"PPT1\",\n      \"KAT2A\",\n      \"TNNI3K\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}