{"gene":"PDIA3","run_date":"2026-06-10T05:19:53","timeline":{"discoveries":[{"year":1994,"finding":"ERp61/GRP58 (PDIA3) is a stress-inducible luminal ER protein with thiol:protein disulfide oxidoreductase activity, confirmed by insulin-reduction assay. It possesses a C-terminal QEDL ER-retention signal. PI-PLC activity is separable from ERp61, and expression of ERp61 in COS cells did not increase PI-PLC activity, definitively disproving its misidentification as phospholipase C.","method":"Antibody identification, amino acid sequencing, expression in COS cells, enzymatic assay (insulin reduction), immunocytochemistry","journal":"Archives of biochemistry and biophysics","confidence":"High","confidence_rationale":"Tier 1 / Strong — enzymatic activity demonstrated in vitro, ER localization confirmed by immunocytochemistry, negative result for PI-PLC activity replicated across two papers (PMID:8109975, PMID:8050492)","pmids":["8109975","8050492"],"is_preprint":false},{"year":1997,"finding":"ERp57 interacts specifically with N-glycosylated integral membrane proteins in a glucose-trimming-dependent manner, and binds in combination with either calnexin or calreticulin, demonstrating that ERp57 acts in concert with these lectin chaperones to modulate glycoprotein folding.","method":"Co-immunoprecipitation, pulse-chase labeling, glucosidase inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with functional perturbation (glucosidase inhibitors), replicated across multiple papers","pmids":["9153243"],"is_preprint":false},{"year":1998,"finding":"ERp57 is a component of the MHC class I peptide-loading complex, associating with calnexin/calreticulin-bound MHC class I molecules, implicating it in the folding of MHC class I at a critical step in peptide loading.","method":"Co-immunoprecipitation, biochemical fractionation","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP from a single lab, functional implication inferred but mechanism confirmed by later structural work","pmids":["9637923"],"is_preprint":false},{"year":2002,"finding":"ERp57 is present in the nucleus of mammalian cells and interacts with DNA in vivo. It associates with nuclear matrix-associated regions (S/MAR-like sequences) and can be cross-linked to DNA in intact viable HeLa and 3T3 cells.","method":"DNA-protein cross-linking (two independent cross-linking agents), immunofluorescence, nuclear fractionation","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal cross-linking methods in intact cells, single lab","pmids":["11948688"],"is_preprint":false},{"year":2002,"finding":"Calnexin, calreticulin, and ERp57 cooperate in disulfide bond formation in CD1d heavy chain in a glucose-trimming-dependent manner; blocking glycan-dependent chaperone interactions with glucosidase inhibitors substantially impairs complete disulfide bond formation in CD1d.","method":"Co-immunoprecipitation, glucosidase inhibitor treatment (castanospermine, N-butyldeoxynojirimycin), pulse-chase analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP with functional perturbation, glucose-trimming dependence demonstrated, replicated in independent substrates","pmids":["12239218"],"is_preprint":false},{"year":2002,"finding":"The DNA-binding activity of ERp57 is localized to the C-terminal a' domain; only the oxidized form of ERp57 binds DNA, and this activity is redox-state dependent.","method":"Recombinant deletion mutants expressed in E. coli, DNA-binding assays, redox manipulation","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — reconstitution with deletion mutants in vitro, single lab","pmids":["12083768"],"is_preprint":false},{"year":2003,"finding":"PDIA3 (ERp60) is a component of a nuclear multiprotein complex (with HMGB1, HMGB2, HSC70, GAPDH) that preferentially binds DNA with thioguanine incorporated, identified by protein mass spectrometry, implicating PDIA3 in the cellular sensor for DNA damage caused by anticancer nucleoside analogues.","method":"Protein mass spectrometry, DNA-affinity pulldown, nuclear complex isolation","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry identification of complex, single lab, functional follow-up in knockout cells for HMGB1 but not PDIA3 specifically","pmids":["12517784"],"is_preprint":false},{"year":2004,"finding":"ERp57 comprises four structural domains (a, b, b', a'), has an elongated shape (~3.4 nm diameter × 16.8 nm length), redox potentials of −0.167 V (a domain) and −0.156 V (a' domain), and efficiently catalyzes disulfide reduction, isomerization, and dithiol oxidation in vitro.","method":"Analytical ultracentrifugation, in vitro thiol-disulfide exchange assays, redox potential measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple in vitro biochemical characterizations with purified protein, rigorous quantitative measurements","pmids":["14871896"],"is_preprint":false},{"year":2004,"finding":"ERp57 is found in STAT3-DNA complexes at the α2-macroglobulin gene enhancer (M14 melanoma) and SIE sequence (HepG2 after IL-6 stimulation); anti-ERp57 antibody blocks STAT3 binding to its consensus DNA sequence, indicating ERp57 is a necessary component of the DNA-bound STAT3 complex.","method":"EMSA, DNA-affinity experiments, chromatin immunoprecipitation, antibody blocking","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — three orthogonal methods (EMSA, ChIP, DNA affinity), single lab","pmids":["15451439"],"is_preprint":false},{"year":2006,"finding":"ERp57 traps mixed disulfide intermediates with endogenous substrates that are mostly heavily glycosylated, disulfide-bonded proteins sharing common structural domains. Folding of two endogenous substrates is impaired in ERp57 knockout cells, and prevention of calnexin/calreticulin interaction perturbs folding of some but not all multi-disulfide substrates.","method":"Mixed disulfide trapping, ERp57 knockout cells, calnexin/calreticulin interaction perturbation","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — substrate trapping combined with knockout validation and chaperone perturbation, multiple orthogonal approaches","pmids":["17170699"],"is_preprint":false},{"year":2006,"finding":"ERp57 and Ref-1/APE interact in vivo in multiple human cell lines (HepG2, M14, Raji), and this interaction increases under oxidative stress. ERp57, when reduced by the thioredoxin-reductase/thioredoxin system, stimulates AP-1 binding to DNA, and ERp57-overexpressing HeLa cells are protected against hydrogen peroxide-induced cell death.","method":"Immunoprecipitation, EMSA (AP-1 binding assay), cell viability assay, stable transfection","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP in multiple cell lines, in vitro functional assay, single lab","pmids":["16962936"],"is_preprint":false},{"year":2006,"finding":"The b' domain of ERp57 mediates targeting to calnexin/calreticulin and determines substrate and partner preferences, distinguishing ERp57 from PDI whose analogous domain has different structural features.","method":"Structural/domain analysis, biochemical domain-swap experiments","journal":"Biochemistry and cell biology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — domain-function assignment from structural and biochemical data, review with primary data cited","pmids":["17215875"],"is_preprint":false},{"year":2007,"finding":"ERp57 binds specific DNA sequences in HeLa cells in vivo, identified by ChIP and cloning of immunoprecipitated fragments. Nine of ten binding sites are in non-coding regions of genes, seven in introns, including genes encoding DNA repair proteins, suggesting a role in transcriptional regulation of stress-response genes.","method":"Chromatin immunoprecipitation, cloning and sequencing of immunoprecipitated DNA","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP with sequence identification, single lab, functional implications inferred","pmids":["17061245"],"is_preprint":false},{"year":2007,"finding":"ERp57 forms a trimeric disulfide complex with MHC class I heavy chain and tapasin within the peptide-loading complex associated with TAP. Direct mutation of a conserved structural cysteine in MHC class I implicates an interaction between ERp57 and the MHC class I peptide-binding groove.","method":"Disulfide-linked complex isolation, site-directed mutagenesis, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — covalent complex isolated, mutagenesis confirms specific cysteine interaction, consistent with structural work","pmids":["17459881"],"is_preprint":false},{"year":2007,"finding":"The DNA-binding activity of the ERp57 a' domain depends on a redox-dependent conformational change: the first cysteine of the CGHC active site (C406) is required, and DNA-binding competent species form intermolecular disulfide bridges between two a' domains rather than intramolecular oxidation. NADH-dependent thioredoxin reductase can reverse these intermolecular disulfides and abolish DNA-binding.","method":"Site-directed mutagenesis (C406S), recombinant domain biochemistry, redox manipulation, thioredoxin reductase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis plus biochemical reconstitution with defined redox chemistry, mechanistically rigorous","pmids":["17283067"],"is_preprint":false},{"year":2007,"finding":"ERp57 (as 1,25D3-MARRS receptor) is present in matrix vesicles of growth plate chondrocytes alongside PLA2 and caveolin-1. 1α,25(OH)2D3 binding to ERp57 on matrix vesicles activates PLA2, producing lysophospholipids that cause MV membrane disorganization and release of active MMPs; direct activation of MMP-3 in MVs requires ERp57.","method":"Biochemical fractionation, enzymatic assays (PLA2, PKC, MMP), immunoprecipitation, antibody blocking","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical assays with antibody blocking, single lab","pmids":["17224270"],"is_preprint":false},{"year":2008,"finding":"CRT and ERp57 co-translocate to the plasma membrane surface during anthracycline-induced immunogenic cell death. A direct CRT-ERp57 interaction is strictly required: CRT point mutants that fail to interact with ERp57 cannot restore ERp57 surface translocation in CRT-/- cells. ERp57-low tumor cells fail to expose CRT and fail to elicit anti-tumor immune responses.","method":"Mass spectrometry, immunofluorescence, co-immunoprecipitation, retroviral shRNA knockdown, CRT point mutant rescue experiments, in vivo tumor models","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including genetic rescue with interaction-deficient point mutants, in vitro and in vivo validation","pmids":["18464797"],"is_preprint":false},{"year":2008,"finding":"ERp57 is present in mitochondria and associates with mitochondrial μ-calpain. ERp57-associated mitochondrial μ-calpain cleaves apoptosis-inducing factor (AIF) to a truncated form; PDI inhibitors (DTNB, PAO) cause degradation of the mitochondrial μ-calpain large subunit and inhibit AIF release from the inner mitochondrial membrane.","method":"MALDI-TOFMS peptide mass fingerprinting, immunoprecipitation, casein zymography, antibody inhibition, isolated mitochondria assays","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical methods (MS, co-IP, zymography), single lab, functional link to AIF truncation established","pmids":["18559257"],"is_preprint":false},{"year":2009,"finding":"ERp57 modulates STAT3 signaling from the lumen of the ER: STAT3-dependent signaling is increased in ERp57-deficient mice, and this is rescued by ER-targeted ERp57 but not cytoplasmic-targeted ERp57. ERp57 effects on STAT3 signaling are enhanced by luminal complex formation with calreticulin. ERp57 knockout (Pdia3 gene trap) causes embryonic lethality at E13.5.","method":"Gene trap knockout mouse, beta-galactosidase reporter, ER-targeted vs. cytoplasmic-targeted ERp57 rescue constructs, STAT3 signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic rescue with compartment-targeted constructs distinguishes ER-luminal vs. cytoplasmic function, in vivo knockout phenotype","pmids":["20022947"],"is_preprint":false},{"year":2009,"finding":"PDIA3 knockdown in cancer cells renders them insensitive to chemotherapy-induced DNA damage signaling: PDIA3 knockdown abolishes H2AX phosphorylation (γ-H2AX) after cytarabine exposure, placing PDIA3 in the H2AX branch of the DNA damage response distinct from the p53 branch.","method":"siRNA knockdown, Western blot, immunofluorescence microscopy, cell proliferation assay","journal":"Molecular cancer therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA in two cell lines with specific readout (γ-H2AX), single lab","pmids":["19372559"],"is_preprint":false},{"year":2009,"finding":"ERp57 knockdown in human endothelial cells protects against hyperoxia- or tunicamycin-induced apoptosis by inhibiting caspase-3 activation and increasing BiP/GRP78 induction; conversely, ERp57 overexpression exacerbates apoptosis and reduces BiP/GRP78 induction.","method":"siRNA knockdown, overexpression, flow cytometry (apoptosis), Western blot (caspase-3, BiP/GRP78)","journal":"American journal of physiology. Lung cellular and molecular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional gain- and loss-of-function with defined mechanistic readouts, single lab","pmids":["19411306"],"is_preprint":false},{"year":2010,"finding":"Pdia3 mediates 1,25(OH)2D3-stimulated rapid membrane responses in osteoblasts: Pdia3 is localized in caveolae co-localizing with caveolin-1. Pdia3 silencing abolishes 1,25(OH)2D3-induced PKC activation and PGE2 release; Pdia3 overexpression augments these responses. Downstream mediators PLAA and arachidonic acid act independently of Pdia3.","method":"Pdia3 siRNA silencing, overexpression, co-localization with lipid rafts/caveolin-1, PKC activity assay, PGE2 measurement, ERK1/2 phosphorylation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — bidirectional modulation (silencing + overexpression) with multiple downstream readouts, caveolae localization established, single lab","pmids":["20843786"],"is_preprint":false},{"year":2010,"finding":"Intestinal epithelial cell-specific knockout of the 1,25D3-MARRS receptor (PDIA3/ERp57) abolishes 1,25D3-stimulated rapid calcium uptake and PKA activation in enterocytes, demonstrating that PDIA3 is the essential mediator of steroid hormone-stimulated calcium uptake in mammalian intestinal cells.","method":"Villin-cre conditional knockout, saturation binding analysis with [3H]1,25D3, calcium uptake assay, PKA activity assay, Western blot, confocal microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific conditional knockout with multiple functional readouts (calcium uptake, PKA), binding confirmed absent in KO cells","pmids":["20682787"],"is_preprint":false},{"year":2010,"finding":"Homozygous Pdia3 disruption causes embryonic lethality. Pdia3+/- heterozygous mice show bone abnormalities (increased metaphyseal bone volume, reduced cortical bone area/thickness). Silencing of Pdia3 in osteoblast-like MC3T3-E1 cells abolishes 1α,25(OH)2D3-induced rapid PKC activation; overexpression augments it.","method":"Gene targeting (homologous recombination), μCT analysis, Pdia3 siRNA and overexpression in osteoblasts, PKC activity assay","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout phenotype corroborated by bidirectional cell-based functional assays, single lab","pmids":["20576531"],"is_preprint":false},{"year":2011,"finding":"ERp57 on the platelet surface mediates platelet aggregation, hemostasis, and thrombosis: inhibitory anti-ERp57 antibodies block αIIbβ3 activation and P-selectin expression, inhibit platelet aggregation, prolong tail bleeding times, and inhibit FeCl3-induced thrombosis in mice. Catalytically inactive ERp57 inhibits platelet aggregation when added exogenously.","method":"Inhibitory antibodies, mouse tail bleeding assay, FeCl3 thrombosis model, αIIbβ3 activation assay, P-selectin expression, functional assay with inactive ERp57","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple in vitro and in vivo assays with both antibody inhibition and catalytically inactive protein, replicated across two labs (PMID:22207737, PMID:22168334)","pmids":["22207737","22168334"],"is_preprint":false},{"year":2012,"finding":"Pdia3 and VDR co-localize in caveolae on osteoblast plasma membranes and both interact with caveolin-1 by immunoprecipitation. Pdia3 interacts with PLAA while VDR interacts with c-Src. Silencing either Pdia3 or VDR, or caveolin-1, inhibits both PLA2 and c-Src rapid responses to 1α,25(OH)2D3, demonstrating interdependent functioning of the two receptors.","method":"Co-immunoprecipitation, siRNA silencing, co-localization, PLA2 and c-Src activity assays","journal":"Cellular signalling","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, triple silencing experiment, multiple downstream signaling readouts, single lab","pmids":["23896121"],"is_preprint":false},{"year":2012,"finding":"VDR and ERp57 interact in nonnuclear extracts (co-IP) and are both required for 1,25(OH)2D3-mediated photoprotection against thymine dimers: antibody neutralization of ERp57 (Ab099) and ERp57 siRNA completely block photoprotection in normal fibroblasts, while VDR null cells also lack photoprotection.","method":"Co-immunoprecipitation, siRNA knockdown, neutralizing antibody (Ab099), thymine dimer quantification, VDR mutant fibroblasts","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and genetic/antibody knockdown with specific molecular readout (thymine dimers), single lab","pmids":["22322599"],"is_preprint":false},{"year":2012,"finding":"PLAA is required for Pdia3-mediated 1α,25(OH)2D3-dependent PKC activation: PLAA co-localizes with Pdia3 and caveolin-1 in caveolae; Pdia3-immunoprecipitated samples contain PLAA only after 1,25D3 treatment; PLAA silencing abolishes 1,25D3-dependent PLA2 and PKC activation and PGE2 release. PLAA is located on the extracellular face of the plasma membrane.","method":"Co-immunoprecipitation (ligand-dependent), PLAA silencing, PLA2/PKC activity assays, PGE2 measurement, cross-linking studies","journal":"The Journal of steroid biochemistry and molecular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ligand-dependent co-IP, silencing of PLAA with multiple functional readouts, extracellular localization confirmed by cross-linking, single lab","pmids":["22484374"],"is_preprint":false},{"year":2012,"finding":"Diosgenin activates the 1,25D3-MARRS (PDIA3) pathway in cortical neurons; PDIA3 knockdown completely inhibits diosgenin-induced axonal growth, and neutralizing antibody against PDIA3 diminishes diosgenin's axonal regeneration effect in Aβ(1-42)-induced axonal atrophy.","method":"siRNA knockdown, neutralizing antibody, axonal growth measurement, Alzheimer's disease mouse model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and antibody blocking with specific cellular readout (axonal growth), single lab","pmids":["22837815"],"is_preprint":false},{"year":2013,"finding":"Chaperone functional domains of Pdia3 (calreticulin-interaction residues K214, R282 and catalytic site C406) are required for proper rapid membrane responses to 1α,25(OH)2D3. Removal of the KDEL ER-retention signal increases plasma membrane Pdia3 localization and augments baseline PKC, but myristoylation (not palmitoylation) is required for PKC activation.","method":"Site-directed mutagenesis, overexpression constructs with/without KDEL, PKC activity assay, PGE2 measurement, plasma membrane fractionation","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure-function mutagenesis of multiple residues combined with subcellular targeting experiments and functional assays, single lab","pmids":["23660595"],"is_preprint":false},{"year":2013,"finding":"ERp57 contributes to EGF receptor signaling: siRNA knockdown of ERp57 in MDA-MB-468 cells impairs EGFR internalization and phosphorylation without affecting EGFR protein expression or EGF binding.","method":"siRNA knockdown, EGFR internalization assay, EGFR phosphorylation (Western blot), EGF binding assay","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA with multiple specific readouts, single lab, single cell line","pmids":["23696074"],"is_preprint":false},{"year":2013,"finding":"ERp57/PDIA3 binds specific DNA fragments in a melanoma cell line in vivo (confirmed by ChIP). ERp57 silencing by RNAi produces significant downregulation of target gene expression. APE/Ref-1 also directly associates with ERp57-targeted DNA regions.","method":"Chromatin immunoprecipitation, siRNA silencing, in vitro biotin-streptavidin binding assay","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo ChIP with functional gene expression readout, single lab","pmids":["23587917"],"is_preprint":false},{"year":2014,"finding":"ERp57 is required for fibrin deposition in vivo. Platelet-specific ERp57 knockout (Pf4-Cre/ERp57fl/fl) reduces fibrin deposition; endothelial cell-specific knockout (Tie2-Cre/ERp57fl/fl) further reduces it. ERp57 inhibits thrombin generation in vitro. The second active site isomerase activity of ERp57 is required for fibrin deposition and platelet accumulation.","method":"Conditional knockout mice (platelet-specific and endothelial-specific), laser-induced thrombosis model, active-site mutants of ERp57, thrombin generation assay","journal":"Journal of thrombosis and haemostasis","confidence":"High","confidence_rationale":"Tier 2 / Strong — two tissue-specific knockouts combined with active-site mutagenesis and in vitro coagulation assay","pmids":["25156521"],"is_preprint":false},{"year":2015,"finding":"ERp57 physically interacts with PrP (prion protein) and controls its maturation and steady-state levels; conditional nervous system-specific ERp57 knockout reduces mono- and nonglycosylated PrP forms in brain, while ERp57 transgenic mice show increased PrP levels. PrP interacts with ERp57 and PDIA1 but not ERp72.","method":"Co-immunoprecipitation, conditional nervous system knockout, ERp57 transgenic mice, Western blot for PrP glycoforms","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo bidirectional genetic manipulation (KO + transgenic) plus co-IP, single lab","pmids":["26170458"],"is_preprint":false},{"year":2015,"finding":"PDIA3 possesses Bak-dependent (but not Bax-dependent) proapoptotic activity: purified PDIA3 protein induces Bak oligomerization and mitochondrial outer membrane permeabilization in vitro; PDIA3 overexpression exacerbates apoptosis whereas knockdown alleviates it. The proapoptotic activity requires Bak.","method":"In vitro reconstitution with purified PDIA3, Bak/Bax knockout cells, mitochondrial outer membrane permeabilization assay, overexpression and siRNA knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified protein combined with genetic requirement (Bak KO) and bidirectional cell-based validation","pmids":["25697356"],"is_preprint":false},{"year":2015,"finding":"ERp57 overexpression in the nervous system enhances locomotor recovery after sciatic nerve injury, associated with enhanced myelin removal, macrophage infiltration, and axonal regeneration, defining a functional role for ERp57 in peripheral nerve regeneration.","method":"ERp57 transgenic mice (prion promoter-driven overexpression), sciatic nerve crush model, behavioral assessment, histological analysis","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model with specific functional readout, single lab","pmids":["26361352"],"is_preprint":false},{"year":2016,"finding":"The circadian gene Clock transcriptionally activates Pdia3 by binding an E-box promoter element; luciferase and ChIP assays confirm Clock-dependent regulation. Forced PDIA3 expression rescues osteogenic defects in Clock mutant mice, and RNAi ablation of PDIA3 completely blocks the compensatory effect of Clock overexpression in osteoblasts.","method":"Luciferase reporter assay, chromatin immunoprecipitation, RNA interference, in vivo rescue experiments in ClockΔ19 mutant mice","journal":"Journal of bone and mineral research","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP confirms direct binding, luciferase confirms transcriptional activation, in vivo genetic epistasis with rescue and knockdown","pmids":["27883226"],"is_preprint":false},{"year":2018,"finding":"ERp57 specifically oxidizes and inactivates extracellular transglutaminase 2 (TG2) with a rate constant 400–2000-fold higher than small-molecule oxidants and markedly higher specificity than other secreted redox proteins. ERp57 co-localizes with extracellular TG2 in HUVECs, and siRNA-mediated ERp57 knockdown increases TG2 transamidation activity extracellularly.","method":"In vitro oxidation assays with purified proteins, rate constant measurements, co-localization by immunofluorescence, siRNA knockdown in HUVECs, transamidation activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins, quantitative kinetics, confirmed by siRNA in cells, mechanistically rigorous","pmids":["29305423"],"is_preprint":false},{"year":2018,"finding":"ERp57 overexpression is protective against mutant SOD1-induced inclusion formation, ER stress, UPS dysfunction, and apoptosis in neuronal cells; conversely, ERp57 silencing enhances mutant SOD1 inclusion formation and toxicity. ERp57 partially co-localizes with TDP-43-positive inclusions in sporadic ALS spinal cord.","method":"ERp57 overexpression, siRNA silencing, primary cortical neurons, inclusion body quantification, apoptosis assay, immunofluorescence in human ALS tissue","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional cell manipulation, primary neuron confirmation, human tissue correlation, single lab","pmids":["29409023"],"is_preprint":false},{"year":2019,"finding":"PDIA3 directly interacts with influenza A virus hemagglutinin (HA) and is required for efficient oxidative folding and oligomerization of HA. PDIA3 inhibition (LOC14) decreases intramolecular disulfide bonds and HA oligomerization in H1N1 and H3N2-infected cells. Lung epithelial-specific PDIA3 deletion in mice reduces viral burden and lung inflammatory markers after IAV infection.","method":"Co-immunoprecipitation (ERp57-HA interaction), PDI inhibitor LOC14, disulfide bond analysis, lung-epithelial conditional knockout mice, viral burden measurement, airway mechanics","journal":"Redox biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct interaction confirmed by co-IP, functional consequence shown by inhibitor and conditional KO, in vivo validation, multiple viral strains","pmids":["30735910"],"is_preprint":false},{"year":2019,"finding":"ERp57 binds STAT3 protein and enhances STAT3-mediated transcriptional activity of ILF3 in ccRCC cells; ILF3 in turn binds ERp57 mRNA and positively regulates ERp57 expression by enhancing mRNA stability, forming a feedback loop. These interactions were confirmed by Co-IP, ChIP, RIP, and oligo pull-down.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, ribonucleoprotein immunoprecipitation, oligo pull-down, promoter luciferase assay","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal interaction assays, single lab, cell-line based","pmids":["31747963"],"is_preprint":false},{"year":2019,"finding":"Drug-induced surface ERp57 in lymphoblasts is dependent on integrin activity: stimulation of α-integrin activity reduces surface ERp57 and CRT. ERp57 is indispensable for extra-ER accumulation of CRT (ERp57-/- cells have minimal cytosolic CRT). The CRT-ERp57 complex is inhibited by α-integrins, and β1-/- cells (reduced α-integrins) show enhanced surface CRT and ERp57.","method":"Genetic knockout (ERp57-/-, CRT-/-, β1-/-), differential subcellular immunostaining, integrin agonist/antagonist treatment, flow cytometry","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple genetic knockouts with specific functional readout, single lab","pmids":["31192123"],"is_preprint":false},{"year":2021,"finding":"PDIA3 inhibition in club cells (SCGB1A1+) via Pdia3 conditional ablation or LOC14 inhibitor decreases parenchymal SCGB1A1 cells and lung fibrosis in bleomycin model. SPP1 (osteopontin) was identified as a major PDIA3 interactor in fibrosis; blocking SPP1 attenuates lung fibrosis.","method":"Club cell-specific Pdia3 knockout, PDI inhibitor LOC14, co-immunoprecipitation (PDIA3-SPP1), SPP1 blocking, bleomycin fibrosis model, histology","journal":"Thorax","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional cell-type-specific knockout and pharmacological inhibition with in vivo readouts, single lab","pmids":["34400514"],"is_preprint":false},{"year":2022,"finding":"Crystal structure at 2.7 Å of the tapasin-ERp57 heterodimer in complex with peptide-receptive MHC class I reveals the molecular details of client recognition: tapasin-ERp57 engages MHC I clients through defined contacts, with elements indispensable for peptide proofreading. ERp57 forms a stable disulfide-linked heterodimer with tapasin in this editing complex.","method":"X-ray crystallography (2.7 Å resolution), structural analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure of the functional complex with mechanistic analysis of key interaction elements","pmids":["36104323"],"is_preprint":false},{"year":2022,"finding":"In the context of HFHF diet-induced liver damage, lipotoxicity and glucotoxicity promote MHC-II presentation of PDIA3 peptides. Passive transfer of PDIA3-specific T cells or PDIA3-specific antibodies exacerbates hepatocyte death in HFHF-fed but not control-diet mice, demonstrating that PDIA3-directed immune autoreactivity contributes to hepatic damage.","method":"MHC-II immunopeptidome analysis, adoptive transfer of PDIA3-specific T cells and antibodies, hepatic transaminase measurement, antigen-specific proliferation assay","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — adoptive transfer experiments establish causal role of PDIA3 autoreactivity, multiple immunological readouts, in vivo validation","pmids":["35984892"],"is_preprint":false},{"year":2024,"finding":"In adipose tissue macrophages (iMAMs), ATF4 acts as a metabolic stress sensor that transcribes PDIA3; PDIA3 then imposes redox control on RhoA activity, strengthening pro-inflammatory and migratory properties of iMAMs through RhoA-YAP signaling. Pdia3 siRNA-loaded liposomes in vivo repress adipose inflammation and HFD-induced obesity.","method":"Single-nucleus RNA sequencing, ChIP assay (ATF4 binding to Pdia3 promoter), RhoA activity assay, YAP signaling analysis, siRNA-loaded liposomes in vivo, high-fat diet model","journal":"Cell metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — transcriptional regulation confirmed by ChIP, downstream signaling mechanism (RhoA-YAP) established, in vivo therapeutic validation with siRNA liposomes","pmids":["39293433"],"is_preprint":false}],"current_model":"PDIA3 (ERp57) is an ER-resident thiol-disulfide oxidoreductase with four structural domains (a, b, b', a') that catalyzes disulfide bond formation, reduction, and isomerization in newly synthesized glycoproteins via the calnexin/calreticulin cycle; at the plasma membrane it functions as the 1,25(OH)2D3-MARRS receptor in caveolae, initiating rapid signaling through PLAA–PLA2–PKC–ERK cascades; it forms a covalent disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex to enable peptide proofreading; it co-translocates with calreticulin to the cell surface during immunogenic cell death; it regulates STAT3 signaling from the ER lumen, exerts Bak-dependent proapoptotic activity at mitochondria, modulates thrombus formation via redox regulation of platelet αIIbβ3 and coagulation, specifically oxidizes and inactivates extracellular transglutaminase 2, and in the nucleus binds specific DNA sequences through a redox-dependent conformational change of its C-terminal a' domain to regulate stress-response gene transcription."},"narrative":{"mechanistic_narrative":"PDIA3 (ERp57/GRP58) is a stress-inducible, ER-resident thiol-disulfide oxidoreductase that catalyzes disulfide formation, reduction, and isomerization in newly synthesized glycoproteins, functioning within the calnexin/calreticulin chaperone cycle [PMID:8109975, PMID:8050492, PMID:14871896, PMID:17170699]. It is recruited to substrates through a glucose-trimming-dependent association with calnexin and calreticulin mediated by its b' domain, and traps mixed-disulfide intermediates with heavily glycosylated, multi-disulfide clients whose folding is impaired upon ERp57 loss [PMID:9153243, PMID:17170699, PMID:17215875]. Specific clients include MHC class I heavy chain—where ERp57 forms a covalent disulfide-linked heterodimer with tapasin in the peptide-loading complex to enable peptide proofreading, as resolved by crystallography of the editing complex—as well as CD1d, prion protein, and influenza hemagglutinin, the last requiring ERp57 for oxidative folding and oligomerization [PMID:9637923, PMID:12239218, PMID:17459881, PMID:26170458, PMID:30735910, PMID:36104323]. Beyond canonical folding, ERp57 modulates STAT3 signaling from the ER lumen in a manner rescued by ER-targeted but not cytoplasmic protein, and its homozygous disruption is embryonic-lethal [PMID:20022947]. At the cell surface and in caveolae, PDIA3 acts as the 1,25(OH)2D3-MARRS receptor, partnering with caveolin-1, VDR, and PLAA to drive rapid PLA2–PKC–ERK signaling, calcium uptake, and PGE2 release, with chaperone-domain residues (K214, R282, C406) required for these membrane responses [PMID:17224270, PMID:20843786, PMID:20682787, PMID:23896121, PMID:22484374, PMID:23660595]. Extracellularly, ERp57 governs redox-dependent processes including platelet aIIbb3 activation, thrombosis, and fibrin deposition, and it specifically oxidizes and inactivates transglutaminase 2 [PMID:22207737, PMID:22168334, PMID:25156521, PMID:29305423]. PDIA3 additionally exhibits Bak-dependent proapoptotic activity at mitochondria and, in the nucleus, binds specific DNA sequences via a redox-dependent conformational change of its C-terminal a' domain to participate in stress-response and transcription-factor complexes [PMID:12083768, PMID:17283067, PMID:25697356]. Transcription of Pdia3 is itself driven by CLOCK and ATF4, integrating it into circadian and metabolic-stress programs [PMID:27883226, PMID:39293433].","teleology":[{"year":1994,"claim":"Establishing that the protein was a genuine ER oxidoreductase, not the phospholipase C it had been misidentified as, defined the molecular activity that anchors all later work.","evidence":"Antibody identification, sequencing, COS-cell expression, and insulin-reduction enzymatic assay","pmids":["8109975","8050492"],"confidence":"High","gaps":["Endogenous substrates not yet identified","Mechanism of substrate selection unknown"]},{"year":1997,"claim":"Showing ERp57 binds glycoproteins in a glucose-trimming-dependent manner with calnexin/calreticulin placed it within the lectin-chaperone folding cycle.","evidence":"Co-IP, pulse-chase, and glucosidase inhibitor treatment","pmids":["9153243"],"confidence":"High","gaps":["Specific catalytic contribution to client disulfides not yet measured","Domain mediating chaperone binding not defined"]},{"year":2002,"claim":"Identification of nuclear ERp57 bound to DNA and localization of redox-dependent DNA-binding to the a' domain opened an unexpected nuclear/transcriptional role.","evidence":"In vivo DNA-protein cross-linking, nuclear fractionation, and recombinant deletion-mutant DNA-binding assays","pmids":["11948688","12083768"],"confidence":"Medium","gaps":["Functional consequence on transcription not demonstrated","How an ER protein reaches the nucleus unresolved"]},{"year":2004,"claim":"Biophysical characterization of the four-domain architecture and quantitative redox potentials defined the catalytic capacity for reduction, isomerization, and oxidation.","evidence":"Analytical ultracentrifugation, in vitro thiol-disulfide exchange, and redox potential measurement of purified protein","pmids":["14871896"],"confidence":"High","gaps":["Domain assignment of substrate vs partner binding not yet established","In-cell relevance of measured potentials not tested"]},{"year":2006,"claim":"Knockout-validated substrate trapping and b'-domain mapping consolidated the calnexin/calreticulin-dependent folding mechanism and explained partner specificity.","evidence":"Mixed-disulfide trapping in ERp57 knockout cells, chaperone-interaction perturbation, and domain analysis","pmids":["17170699","17215875"],"confidence":"High","gaps":["Not all multi-disulfide substrates depend on calnexin/calreticulin","Full client repertoire incomplete"]},{"year":2007,"claim":"Resolving the covalent ERp57-tapasin-MHC I trimeric complex and the redox-driven intermolecular a'-disulfide mechanism of DNA binding mechanistically separated the folding and nuclear activities.","evidence":"Disulfide-complex isolation with MHC I cysteine mutagenesis; C406S mutagenesis and thioredoxin-reductase reversal of a'-domain dimers","pmids":["17459881","17283067","17061245"],"confidence":"High","gaps":["Stoichiometry of nuclear vs ER pools unquantified","Direct transcriptional targets not yet functionally validated"]},{"year":2008,"claim":"Demonstrating ER-luminal control of STAT3 and obligate CRT co-translocation during immunogenic cell death extended ERp57 beyond folding into signaling and immunity.","evidence":"Compartment-targeted rescue in gene-trap knockout mice for STAT3; CRT point-mutant rescue, knockdown, and tumor models for surface translocation","pmids":["20022947","18464797"],"confidence":"High","gaps":["Molecular mechanism by which luminal ERp57 alters STAT3 unclear","Route of co-translocation to the cell surface undefined"]},{"year":2010,"claim":"Genetic and structure-function dissection established PDIA3 as the essential 1,25(OH)2D3-MARRS receptor mediating rapid caveolar membrane signaling and calcium uptake.","evidence":"Tissue-specific conditional knockouts (intestine, osteoblast lineage), ligand binding analysis, and bidirectional silencing/overexpression with PKC/PKA/calcium readouts","pmids":["20682787","20843786","20576531"],"confidence":"High","gaps":["How an oxidoreductase transduces a steroid ligand signal mechanistically unresolved","Surface targeting/orientation of PDIA3 incompletely defined"]},{"year":2012,"claim":"Mapping the caveolar receptor module (VDR, caveolin-1, PLAA) defined an interdependent two-receptor system for vitamin D rapid responses and photoprotection.","evidence":"Reciprocal co-IP, multi-component silencing, and downstream PLA2/c-Src/thymine-dimer readouts","pmids":["23896121","22322599","22484374"],"confidence":"High","gaps":["Direct ligand-binding residues on PDIA3 not mapped","Topology coordinating extracellular PLAA with intracellular effectors unclear"]},{"year":2014,"claim":"Tissue-specific knockouts plus active-site mutagenesis established the extracellular redox role of ERp57 in platelet activation, thrombosis, and fibrin deposition.","evidence":"Platelet- and endothelial-specific knockouts, laser- and FeCl3-thrombosis models, inhibitory antibodies, and active-site mutants","pmids":["22207737","22168334","25156521"],"confidence":"High","gaps":["Identity of all relevant surface redox substrates beyond aIIbb3 incomplete","Source of surface/extracellular ERp57 not fully defined"]},{"year":2015,"claim":"Reconstitution and substrate work defined discrete cytoprotective/proapoptotic and proteostatic functions, including Bak-dependent apoptosis and PrP maturation control.","evidence":"In vitro reconstitution with purified PDIA3 in Bak/Bax knockout systems; conditional KO and transgenic mice for PrP glycoforms","pmids":["25697356","26170458","26361352"],"confidence":"High","gaps":["How an ER protein engages mitochondrial Bak mechanistically unclear","Physiological trigger of proapoptotic vs cytoprotective modes undefined"]},{"year":2018,"claim":"Quantitative kinetics identified TG2 as a specific extracellular oxidation target, demonstrating ERp57 acts as a dedicated redox regulator of a secreted enzyme.","evidence":"In vitro oxidation with purified proteins, rate-constant measurement, and siRNA in HUVECs","pmids":["29305423"],"confidence":"High","gaps":["Physiological contexts where ERp57 oxidizes TG2 in vivo not established","Other extracellular substrates not catalogued"]},{"year":2019,"claim":"Defining the CLOCK transcriptional input and influenza HA folding requirement linked PDIA3 expression and client folding to circadian/host-pathogen physiology.","evidence":"ChIP/luciferase and in vivo rescue for CLOCK regulation; co-IP, inhibitor, and lung-epithelial conditional KO for HA folding","pmids":["27883226","30735910"],"confidence":"High","gaps":["Breadth of CLOCK-driven PDIA3 functions unknown","Therapeutic window of PDIA3 inhibition in infection undefined"]},{"year":2024,"claim":"Identification of an ATF4–PDIA3–RhoA–YAP axis in adipose macrophages established PDIA3 as a redox effector in metabolic-stress inflammation and a therapeutic target.","evidence":"snRNA-seq, ATF4 promoter ChIP, RhoA/YAP signaling assays, and in vivo siRNA-liposome knockdown in a high-fat-diet model","pmids":["39293433"],"confidence":"High","gaps":["Redox mechanism by which PDIA3 controls RhoA not fully resolved","Generality across macrophage populations untested"]},{"year":null,"claim":"How a single ER oxidoreductase is partitioned and targeted across ER lumen, plasma membrane/caveolae, mitochondria, nucleus, and extracellular space to execute its distinct functions remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Trafficking signals beyond KDEL/myristoylation incompletely defined","Quantitative balance among compartmental pools unknown","Whether catalytic redox activity underlies all noncanonical roles untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,1,7,9,37]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[7,24,37]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[1,9,11,33,39]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[3,5,14,12]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[21,22]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,9,18]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[15,21,24,25]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[3,8,12,14]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[17,34]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[37,24,16]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,9,39]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,13,16,43,44]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[24,32]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[18,21,25,30,45]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[20,34]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[8,12,36,40]}],"complexes":["MHC class I peptide-loading complex","calnexin/calreticulin chaperone cycle","1,25D3-MARRS caveolar receptor complex"],"partners":["TAPBP","CALR","CANX","PLAA","VDR","CAV1","STAT3","TGM2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P30101","full_name":"Protein disulfide-isomerase A3","aliases":["58 kDa glucose-regulated protein","58 kDa microsomal protein","p58","Disulfide isomerase ER-60","Endoplasmic reticulum resident protein 57","ER protein 57","ERp57","Endoplasmic reticulum resident protein 60","ER protein 60","ERp60"],"length_aa":505,"mass_kda":56.8,"function":"Protein disulfide isomerase that catalyzes the formation, isomerization, and reduction or oxidation of disulfide bonds in client proteins and functions as a protein folding chaperone (PubMed:11825568, PubMed:16193070, PubMed:27897272, PubMed:36104323, PubMed:7487104). Core component of the major histocompatibility complex class I (MHC I) peptide loading complex where it functions as an essential folding chaperone for TAPBP. Through TAPBP, assists the dynamic assembly of the MHC I complex with high affinity antigens in the endoplasmic reticulum. Therefore, plays a crucial role in the presentation of antigens to cytotoxic T cells in adaptive immunity (PubMed:35948544, PubMed:36104323)","subcellular_location":"Endoplasmic reticulum; Endoplasmic reticulum lumen; Melanosome","url":"https://www.uniprot.org/uniprotkb/P30101/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/PDIA3","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/PDIA3","total_profiled":1310},"omim":[{"mim_id":"620096","title":"RING FINGER PROTEIN 185; RNF185","url":"https://www.omim.org/entry/620096"},{"mim_id":"618588","title":"PROTEIN DISULFIDE ISOMERASE-LIKE PROTEIN, TESTIS-EXPRESSED; PDILT","url":"https://www.omim.org/entry/618588"},{"mim_id":"617218","title":"TRANSMEMBRANE AND TETRATRICOPEPTIDE REPEAT DOMAINS-CONTAINING PROTEIN 3; TMTC3","url":"https://www.omim.org/entry/617218"},{"mim_id":"616766","title":"THIOREDOXIN-RELATED TRANSMEMBRANE PROTEIN 4; TMX4","url":"https://www.omim.org/entry/616766"},{"mim_id":"615437","title":"ENDOPLASMIC RETICULUM OXIDOREDUCTIN 1-LIKE, BETA; ERO1LB","url":"https://www.omim.org/entry/615437"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Endoplasmic reticulum","reliability":"Enhanced"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"thyroid gland","ntpm":292.0}],"url":"https://www.proteinatlas.org/search/PDIA3"},"hgnc":{"alias_symbol":["P58","ERp61","ERp57","ERp60","GRP57","PI-PLC","HsT17083"],"prev_symbol":["GRP58"]},"alphafold":{"accession":"P30101","domains":[{"cath_id":"3.40.30.10","chopping":"27-130","consensus_level":"high","plddt":93.3322,"start":27,"end":130},{"cath_id":"3.40.30.10","chopping":"135-239","consensus_level":"high","plddt":95.6385,"start":135,"end":239},{"cath_id":"3.40.30.10","chopping":"245-357","consensus_level":"high","plddt":94.7839,"start":245,"end":357},{"cath_id":"3.40.30.10","chopping":"378-482","consensus_level":"high","plddt":95.6911,"start":378,"end":482}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P30101","model_url":"https://alphafold.ebi.ac.uk/files/AF-P30101-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P30101-F1-predicted_aligned_error_v6.png","plddt_mean":91.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=PDIA3","jax_strain_url":"https://www.jax.org/strain/search?query=PDIA3"},"sequence":{"accession":"P30101","fasta_url":"https://rest.uniprot.org/uniprotkb/P30101.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P30101/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P30101"}},"corpus_meta":[{"pmid":"18464797","id":"PMC_18464797","title":"The 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It possesses a C-terminal QEDL ER-retention signal. PI-PLC activity is separable from ERp61, and expression of ERp61 in COS cells did not increase PI-PLC activity, definitively disproving its misidentification as phospholipase C.\",\n      \"method\": \"Antibody identification, amino acid sequencing, expression in COS cells, enzymatic assay (insulin reduction), immunocytochemistry\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — enzymatic activity demonstrated in vitro, ER localization confirmed by immunocytochemistry, negative result for PI-PLC activity replicated across two papers (PMID:8109975, PMID:8050492)\",\n      \"pmids\": [\"8109975\", \"8050492\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ERp57 interacts specifically with N-glycosylated integral membrane proteins in a glucose-trimming-dependent manner, and binds in combination with either calnexin or calreticulin, demonstrating that ERp57 acts in concert with these lectin chaperones to modulate glycoprotein folding.\",\n      \"method\": \"Co-immunoprecipitation, pulse-chase labeling, glucosidase inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with functional perturbation (glucosidase inhibitors), replicated across multiple papers\",\n      \"pmids\": [\"9153243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"ERp57 is a component of the MHC class I peptide-loading complex, associating with calnexin/calreticulin-bound MHC class I molecules, implicating it in the folding of MHC class I at a critical step in peptide loading.\",\n      \"method\": \"Co-immunoprecipitation, biochemical fractionation\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP from a single lab, functional implication inferred but mechanism confirmed by later structural work\",\n      \"pmids\": [\"9637923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"ERp57 is present in the nucleus of mammalian cells and interacts with DNA in vivo. It associates with nuclear matrix-associated regions (S/MAR-like sequences) and can be cross-linked to DNA in intact viable HeLa and 3T3 cells.\",\n      \"method\": \"DNA-protein cross-linking (two independent cross-linking agents), immunofluorescence, nuclear fractionation\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal cross-linking methods in intact cells, single lab\",\n      \"pmids\": [\"11948688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Calnexin, calreticulin, and ERp57 cooperate in disulfide bond formation in CD1d heavy chain in a glucose-trimming-dependent manner; blocking glycan-dependent chaperone interactions with glucosidase inhibitors substantially impairs complete disulfide bond formation in CD1d.\",\n      \"method\": \"Co-immunoprecipitation, glucosidase inhibitor treatment (castanospermine, N-butyldeoxynojirimycin), pulse-chase analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP with functional perturbation, glucose-trimming dependence demonstrated, replicated in independent substrates\",\n      \"pmids\": [\"12239218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The DNA-binding activity of ERp57 is localized to the C-terminal a' domain; only the oxidized form of ERp57 binds DNA, and this activity is redox-state dependent.\",\n      \"method\": \"Recombinant deletion mutants expressed in E. coli, DNA-binding assays, redox manipulation\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution with deletion mutants in vitro, single lab\",\n      \"pmids\": [\"12083768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PDIA3 (ERp60) is a component of a nuclear multiprotein complex (with HMGB1, HMGB2, HSC70, GAPDH) that preferentially binds DNA with thioguanine incorporated, identified by protein mass spectrometry, implicating PDIA3 in the cellular sensor for DNA damage caused by anticancer nucleoside analogues.\",\n      \"method\": \"Protein mass spectrometry, DNA-affinity pulldown, nuclear complex isolation\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry identification of complex, single lab, functional follow-up in knockout cells for HMGB1 but not PDIA3 specifically\",\n      \"pmids\": [\"12517784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERp57 comprises four structural domains (a, b, b', a'), has an elongated shape (~3.4 nm diameter × 16.8 nm length), redox potentials of −0.167 V (a domain) and −0.156 V (a' domain), and efficiently catalyzes disulfide reduction, isomerization, and dithiol oxidation in vitro.\",\n      \"method\": \"Analytical ultracentrifugation, in vitro thiol-disulfide exchange assays, redox potential measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple in vitro biochemical characterizations with purified protein, rigorous quantitative measurements\",\n      \"pmids\": [\"14871896\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERp57 is found in STAT3-DNA complexes at the α2-macroglobulin gene enhancer (M14 melanoma) and SIE sequence (HepG2 after IL-6 stimulation); anti-ERp57 antibody blocks STAT3 binding to its consensus DNA sequence, indicating ERp57 is a necessary component of the DNA-bound STAT3 complex.\",\n      \"method\": \"EMSA, DNA-affinity experiments, chromatin immunoprecipitation, antibody blocking\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — three orthogonal methods (EMSA, ChIP, DNA affinity), single lab\",\n      \"pmids\": [\"15451439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ERp57 traps mixed disulfide intermediates with endogenous substrates that are mostly heavily glycosylated, disulfide-bonded proteins sharing common structural domains. Folding of two endogenous substrates is impaired in ERp57 knockout cells, and prevention of calnexin/calreticulin interaction perturbs folding of some but not all multi-disulfide substrates.\",\n      \"method\": \"Mixed disulfide trapping, ERp57 knockout cells, calnexin/calreticulin interaction perturbation\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — substrate trapping combined with knockout validation and chaperone perturbation, multiple orthogonal approaches\",\n      \"pmids\": [\"17170699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ERp57 and Ref-1/APE interact in vivo in multiple human cell lines (HepG2, M14, Raji), and this interaction increases under oxidative stress. ERp57, when reduced by the thioredoxin-reductase/thioredoxin system, stimulates AP-1 binding to DNA, and ERp57-overexpressing HeLa cells are protected against hydrogen peroxide-induced cell death.\",\n      \"method\": \"Immunoprecipitation, EMSA (AP-1 binding assay), cell viability assay, stable transfection\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP in multiple cell lines, in vitro functional assay, single lab\",\n      \"pmids\": [\"16962936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The b' domain of ERp57 mediates targeting to calnexin/calreticulin and determines substrate and partner preferences, distinguishing ERp57 from PDI whose analogous domain has different structural features.\",\n      \"method\": \"Structural/domain analysis, biochemical domain-swap experiments\",\n      \"journal\": \"Biochemistry and cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain-function assignment from structural and biochemical data, review with primary data cited\",\n      \"pmids\": [\"17215875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 binds specific DNA sequences in HeLa cells in vivo, identified by ChIP and cloning of immunoprecipitated fragments. Nine of ten binding sites are in non-coding regions of genes, seven in introns, including genes encoding DNA repair proteins, suggesting a role in transcriptional regulation of stress-response genes.\",\n      \"method\": \"Chromatin immunoprecipitation, cloning and sequencing of immunoprecipitated DNA\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP with sequence identification, single lab, functional implications inferred\",\n      \"pmids\": [\"17061245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 forms a trimeric disulfide complex with MHC class I heavy chain and tapasin within the peptide-loading complex associated with TAP. Direct mutation of a conserved structural cysteine in MHC class I implicates an interaction between ERp57 and the MHC class I peptide-binding groove.\",\n      \"method\": \"Disulfide-linked complex isolation, site-directed mutagenesis, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — covalent complex isolated, mutagenesis confirms specific cysteine interaction, consistent with structural work\",\n      \"pmids\": [\"17459881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The DNA-binding activity of the ERp57 a' domain depends on a redox-dependent conformational change: the first cysteine of the CGHC active site (C406) is required, and DNA-binding competent species form intermolecular disulfide bridges between two a' domains rather than intramolecular oxidation. NADH-dependent thioredoxin reductase can reverse these intermolecular disulfides and abolish DNA-binding.\",\n      \"method\": \"Site-directed mutagenesis (C406S), recombinant domain biochemistry, redox manipulation, thioredoxin reductase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis plus biochemical reconstitution with defined redox chemistry, mechanistically rigorous\",\n      \"pmids\": [\"17283067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 (as 1,25D3-MARRS receptor) is present in matrix vesicles of growth plate chondrocytes alongside PLA2 and caveolin-1. 1α,25(OH)2D3 binding to ERp57 on matrix vesicles activates PLA2, producing lysophospholipids that cause MV membrane disorganization and release of active MMPs; direct activation of MMP-3 in MVs requires ERp57.\",\n      \"method\": \"Biochemical fractionation, enzymatic assays (PLA2, PKC, MMP), immunoprecipitation, antibody blocking\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical assays with antibody blocking, single lab\",\n      \"pmids\": [\"17224270\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CRT and ERp57 co-translocate to the plasma membrane surface during anthracycline-induced immunogenic cell death. A direct CRT-ERp57 interaction is strictly required: CRT point mutants that fail to interact with ERp57 cannot restore ERp57 surface translocation in CRT-/- cells. ERp57-low tumor cells fail to expose CRT and fail to elicit anti-tumor immune responses.\",\n      \"method\": \"Mass spectrometry, immunofluorescence, co-immunoprecipitation, retroviral shRNA knockdown, CRT point mutant rescue experiments, in vivo tumor models\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including genetic rescue with interaction-deficient point mutants, in vitro and in vivo validation\",\n      \"pmids\": [\"18464797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ERp57 is present in mitochondria and associates with mitochondrial μ-calpain. ERp57-associated mitochondrial μ-calpain cleaves apoptosis-inducing factor (AIF) to a truncated form; PDI inhibitors (DTNB, PAO) cause degradation of the mitochondrial μ-calpain large subunit and inhibit AIF release from the inner mitochondrial membrane.\",\n      \"method\": \"MALDI-TOFMS peptide mass fingerprinting, immunoprecipitation, casein zymography, antibody inhibition, isolated mitochondria assays\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical methods (MS, co-IP, zymography), single lab, functional link to AIF truncation established\",\n      \"pmids\": [\"18559257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ERp57 modulates STAT3 signaling from the lumen of the ER: STAT3-dependent signaling is increased in ERp57-deficient mice, and this is rescued by ER-targeted ERp57 but not cytoplasmic-targeted ERp57. ERp57 effects on STAT3 signaling are enhanced by luminal complex formation with calreticulin. ERp57 knockout (Pdia3 gene trap) causes embryonic lethality at E13.5.\",\n      \"method\": \"Gene trap knockout mouse, beta-galactosidase reporter, ER-targeted vs. cytoplasmic-targeted ERp57 rescue constructs, STAT3 signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic rescue with compartment-targeted constructs distinguishes ER-luminal vs. cytoplasmic function, in vivo knockout phenotype\",\n      \"pmids\": [\"20022947\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PDIA3 knockdown in cancer cells renders them insensitive to chemotherapy-induced DNA damage signaling: PDIA3 knockdown abolishes H2AX phosphorylation (γ-H2AX) after cytarabine exposure, placing PDIA3 in the H2AX branch of the DNA damage response distinct from the p53 branch.\",\n      \"method\": \"siRNA knockdown, Western blot, immunofluorescence microscopy, cell proliferation assay\",\n      \"journal\": \"Molecular cancer therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA in two cell lines with specific readout (γ-H2AX), single lab\",\n      \"pmids\": [\"19372559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ERp57 knockdown in human endothelial cells protects against hyperoxia- or tunicamycin-induced apoptosis by inhibiting caspase-3 activation and increasing BiP/GRP78 induction; conversely, ERp57 overexpression exacerbates apoptosis and reduces BiP/GRP78 induction.\",\n      \"method\": \"siRNA knockdown, overexpression, flow cytometry (apoptosis), Western blot (caspase-3, BiP/GRP78)\",\n      \"journal\": \"American journal of physiology. Lung cellular and molecular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional gain- and loss-of-function with defined mechanistic readouts, single lab\",\n      \"pmids\": [\"19411306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Pdia3 mediates 1,25(OH)2D3-stimulated rapid membrane responses in osteoblasts: Pdia3 is localized in caveolae co-localizing with caveolin-1. Pdia3 silencing abolishes 1,25(OH)2D3-induced PKC activation and PGE2 release; Pdia3 overexpression augments these responses. Downstream mediators PLAA and arachidonic acid act independently of Pdia3.\",\n      \"method\": \"Pdia3 siRNA silencing, overexpression, co-localization with lipid rafts/caveolin-1, PKC activity assay, PGE2 measurement, ERK1/2 phosphorylation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — bidirectional modulation (silencing + overexpression) with multiple downstream readouts, caveolae localization established, single lab\",\n      \"pmids\": [\"20843786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Intestinal epithelial cell-specific knockout of the 1,25D3-MARRS receptor (PDIA3/ERp57) abolishes 1,25D3-stimulated rapid calcium uptake and PKA activation in enterocytes, demonstrating that PDIA3 is the essential mediator of steroid hormone-stimulated calcium uptake in mammalian intestinal cells.\",\n      \"method\": \"Villin-cre conditional knockout, saturation binding analysis with [3H]1,25D3, calcium uptake assay, PKA activity assay, Western blot, confocal microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific conditional knockout with multiple functional readouts (calcium uptake, PKA), binding confirmed absent in KO cells\",\n      \"pmids\": [\"20682787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Homozygous Pdia3 disruption causes embryonic lethality. Pdia3+/- heterozygous mice show bone abnormalities (increased metaphyseal bone volume, reduced cortical bone area/thickness). Silencing of Pdia3 in osteoblast-like MC3T3-E1 cells abolishes 1α,25(OH)2D3-induced rapid PKC activation; overexpression augments it.\",\n      \"method\": \"Gene targeting (homologous recombination), μCT analysis, Pdia3 siRNA and overexpression in osteoblasts, PKC activity assay\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout phenotype corroborated by bidirectional cell-based functional assays, single lab\",\n      \"pmids\": [\"20576531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ERp57 on the platelet surface mediates platelet aggregation, hemostasis, and thrombosis: inhibitory anti-ERp57 antibodies block αIIbβ3 activation and P-selectin expression, inhibit platelet aggregation, prolong tail bleeding times, and inhibit FeCl3-induced thrombosis in mice. Catalytically inactive ERp57 inhibits platelet aggregation when added exogenously.\",\n      \"method\": \"Inhibitory antibodies, mouse tail bleeding assay, FeCl3 thrombosis model, αIIbβ3 activation assay, P-selectin expression, functional assay with inactive ERp57\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple in vitro and in vivo assays with both antibody inhibition and catalytically inactive protein, replicated across two labs (PMID:22207737, PMID:22168334)\",\n      \"pmids\": [\"22207737\", \"22168334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Pdia3 and VDR co-localize in caveolae on osteoblast plasma membranes and both interact with caveolin-1 by immunoprecipitation. Pdia3 interacts with PLAA while VDR interacts with c-Src. Silencing either Pdia3 or VDR, or caveolin-1, inhibits both PLA2 and c-Src rapid responses to 1α,25(OH)2D3, demonstrating interdependent functioning of the two receptors.\",\n      \"method\": \"Co-immunoprecipitation, siRNA silencing, co-localization, PLA2 and c-Src activity assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, triple silencing experiment, multiple downstream signaling readouts, single lab\",\n      \"pmids\": [\"23896121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"VDR and ERp57 interact in nonnuclear extracts (co-IP) and are both required for 1,25(OH)2D3-mediated photoprotection against thymine dimers: antibody neutralization of ERp57 (Ab099) and ERp57 siRNA completely block photoprotection in normal fibroblasts, while VDR null cells also lack photoprotection.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, neutralizing antibody (Ab099), thymine dimer quantification, VDR mutant fibroblasts\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and genetic/antibody knockdown with specific molecular readout (thymine dimers), single lab\",\n      \"pmids\": [\"22322599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PLAA is required for Pdia3-mediated 1α,25(OH)2D3-dependent PKC activation: PLAA co-localizes with Pdia3 and caveolin-1 in caveolae; Pdia3-immunoprecipitated samples contain PLAA only after 1,25D3 treatment; PLAA silencing abolishes 1,25D3-dependent PLA2 and PKC activation and PGE2 release. PLAA is located on the extracellular face of the plasma membrane.\",\n      \"method\": \"Co-immunoprecipitation (ligand-dependent), PLAA silencing, PLA2/PKC activity assays, PGE2 measurement, cross-linking studies\",\n      \"journal\": \"The Journal of steroid biochemistry and molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ligand-dependent co-IP, silencing of PLAA with multiple functional readouts, extracellular localization confirmed by cross-linking, single lab\",\n      \"pmids\": [\"22484374\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Diosgenin activates the 1,25D3-MARRS (PDIA3) pathway in cortical neurons; PDIA3 knockdown completely inhibits diosgenin-induced axonal growth, and neutralizing antibody against PDIA3 diminishes diosgenin's axonal regeneration effect in Aβ(1-42)-induced axonal atrophy.\",\n      \"method\": \"siRNA knockdown, neutralizing antibody, axonal growth measurement, Alzheimer's disease mouse model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and antibody blocking with specific cellular readout (axonal growth), single lab\",\n      \"pmids\": [\"22837815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Chaperone functional domains of Pdia3 (calreticulin-interaction residues K214, R282 and catalytic site C406) are required for proper rapid membrane responses to 1α,25(OH)2D3. Removal of the KDEL ER-retention signal increases plasma membrane Pdia3 localization and augments baseline PKC, but myristoylation (not palmitoylation) is required for PKC activation.\",\n      \"method\": \"Site-directed mutagenesis, overexpression constructs with/without KDEL, PKC activity assay, PGE2 measurement, plasma membrane fractionation\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure-function mutagenesis of multiple residues combined with subcellular targeting experiments and functional assays, single lab\",\n      \"pmids\": [\"23660595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ERp57 contributes to EGF receptor signaling: siRNA knockdown of ERp57 in MDA-MB-468 cells impairs EGFR internalization and phosphorylation without affecting EGFR protein expression or EGF binding.\",\n      \"method\": \"siRNA knockdown, EGFR internalization assay, EGFR phosphorylation (Western blot), EGF binding assay\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA with multiple specific readouts, single lab, single cell line\",\n      \"pmids\": [\"23696074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ERp57/PDIA3 binds specific DNA fragments in a melanoma cell line in vivo (confirmed by ChIP). ERp57 silencing by RNAi produces significant downregulation of target gene expression. APE/Ref-1 also directly associates with ERp57-targeted DNA regions.\",\n      \"method\": \"Chromatin immunoprecipitation, siRNA silencing, in vitro biotin-streptavidin binding assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo ChIP with functional gene expression readout, single lab\",\n      \"pmids\": [\"23587917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ERp57 is required for fibrin deposition in vivo. Platelet-specific ERp57 knockout (Pf4-Cre/ERp57fl/fl) reduces fibrin deposition; endothelial cell-specific knockout (Tie2-Cre/ERp57fl/fl) further reduces it. ERp57 inhibits thrombin generation in vitro. The second active site isomerase activity of ERp57 is required for fibrin deposition and platelet accumulation.\",\n      \"method\": \"Conditional knockout mice (platelet-specific and endothelial-specific), laser-induced thrombosis model, active-site mutants of ERp57, thrombin generation assay\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two tissue-specific knockouts combined with active-site mutagenesis and in vitro coagulation assay\",\n      \"pmids\": [\"25156521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERp57 physically interacts with PrP (prion protein) and controls its maturation and steady-state levels; conditional nervous system-specific ERp57 knockout reduces mono- and nonglycosylated PrP forms in brain, while ERp57 transgenic mice show increased PrP levels. PrP interacts with ERp57 and PDIA1 but not ERp72.\",\n      \"method\": \"Co-immunoprecipitation, conditional nervous system knockout, ERp57 transgenic mice, Western blot for PrP glycoforms\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo bidirectional genetic manipulation (KO + transgenic) plus co-IP, single lab\",\n      \"pmids\": [\"26170458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDIA3 possesses Bak-dependent (but not Bax-dependent) proapoptotic activity: purified PDIA3 protein induces Bak oligomerization and mitochondrial outer membrane permeabilization in vitro; PDIA3 overexpression exacerbates apoptosis whereas knockdown alleviates it. The proapoptotic activity requires Bak.\",\n      \"method\": \"In vitro reconstitution with purified PDIA3, Bak/Bax knockout cells, mitochondrial outer membrane permeabilization assay, overexpression and siRNA knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified protein combined with genetic requirement (Bak KO) and bidirectional cell-based validation\",\n      \"pmids\": [\"25697356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERp57 overexpression in the nervous system enhances locomotor recovery after sciatic nerve injury, associated with enhanced myelin removal, macrophage infiltration, and axonal regeneration, defining a functional role for ERp57 in peripheral nerve regeneration.\",\n      \"method\": \"ERp57 transgenic mice (prion promoter-driven overexpression), sciatic nerve crush model, behavioral assessment, histological analysis\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model with specific functional readout, single lab\",\n      \"pmids\": [\"26361352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The circadian gene Clock transcriptionally activates Pdia3 by binding an E-box promoter element; luciferase and ChIP assays confirm Clock-dependent regulation. Forced PDIA3 expression rescues osteogenic defects in Clock mutant mice, and RNAi ablation of PDIA3 completely blocks the compensatory effect of Clock overexpression in osteoblasts.\",\n      \"method\": \"Luciferase reporter assay, chromatin immunoprecipitation, RNA interference, in vivo rescue experiments in ClockΔ19 mutant mice\",\n      \"journal\": \"Journal of bone and mineral research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP confirms direct binding, luciferase confirms transcriptional activation, in vivo genetic epistasis with rescue and knockdown\",\n      \"pmids\": [\"27883226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ERp57 specifically oxidizes and inactivates extracellular transglutaminase 2 (TG2) with a rate constant 400–2000-fold higher than small-molecule oxidants and markedly higher specificity than other secreted redox proteins. ERp57 co-localizes with extracellular TG2 in HUVECs, and siRNA-mediated ERp57 knockdown increases TG2 transamidation activity extracellularly.\",\n      \"method\": \"In vitro oxidation assays with purified proteins, rate constant measurements, co-localization by immunofluorescence, siRNA knockdown in HUVECs, transamidation activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins, quantitative kinetics, confirmed by siRNA in cells, mechanistically rigorous\",\n      \"pmids\": [\"29305423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ERp57 overexpression is protective against mutant SOD1-induced inclusion formation, ER stress, UPS dysfunction, and apoptosis in neuronal cells; conversely, ERp57 silencing enhances mutant SOD1 inclusion formation and toxicity. ERp57 partially co-localizes with TDP-43-positive inclusions in sporadic ALS spinal cord.\",\n      \"method\": \"ERp57 overexpression, siRNA silencing, primary cortical neurons, inclusion body quantification, apoptosis assay, immunofluorescence in human ALS tissue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional cell manipulation, primary neuron confirmation, human tissue correlation, single lab\",\n      \"pmids\": [\"29409023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PDIA3 directly interacts with influenza A virus hemagglutinin (HA) and is required for efficient oxidative folding and oligomerization of HA. PDIA3 inhibition (LOC14) decreases intramolecular disulfide bonds and HA oligomerization in H1N1 and H3N2-infected cells. Lung epithelial-specific PDIA3 deletion in mice reduces viral burden and lung inflammatory markers after IAV infection.\",\n      \"method\": \"Co-immunoprecipitation (ERp57-HA interaction), PDI inhibitor LOC14, disulfide bond analysis, lung-epithelial conditional knockout mice, viral burden measurement, airway mechanics\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct interaction confirmed by co-IP, functional consequence shown by inhibitor and conditional KO, in vivo validation, multiple viral strains\",\n      \"pmids\": [\"30735910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ERp57 binds STAT3 protein and enhances STAT3-mediated transcriptional activity of ILF3 in ccRCC cells; ILF3 in turn binds ERp57 mRNA and positively regulates ERp57 expression by enhancing mRNA stability, forming a feedback loop. These interactions were confirmed by Co-IP, ChIP, RIP, and oligo pull-down.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, ribonucleoprotein immunoprecipitation, oligo pull-down, promoter luciferase assay\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal interaction assays, single lab, cell-line based\",\n      \"pmids\": [\"31747963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Drug-induced surface ERp57 in lymphoblasts is dependent on integrin activity: stimulation of α-integrin activity reduces surface ERp57 and CRT. ERp57 is indispensable for extra-ER accumulation of CRT (ERp57-/- cells have minimal cytosolic CRT). The CRT-ERp57 complex is inhibited by α-integrins, and β1-/- cells (reduced α-integrins) show enhanced surface CRT and ERp57.\",\n      \"method\": \"Genetic knockout (ERp57-/-, CRT-/-, β1-/-), differential subcellular immunostaining, integrin agonist/antagonist treatment, flow cytometry\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple genetic knockouts with specific functional readout, single lab\",\n      \"pmids\": [\"31192123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PDIA3 inhibition in club cells (SCGB1A1+) via Pdia3 conditional ablation or LOC14 inhibitor decreases parenchymal SCGB1A1 cells and lung fibrosis in bleomycin model. SPP1 (osteopontin) was identified as a major PDIA3 interactor in fibrosis; blocking SPP1 attenuates lung fibrosis.\",\n      \"method\": \"Club cell-specific Pdia3 knockout, PDI inhibitor LOC14, co-immunoprecipitation (PDIA3-SPP1), SPP1 blocking, bleomycin fibrosis model, histology\",\n      \"journal\": \"Thorax\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional cell-type-specific knockout and pharmacological inhibition with in vivo readouts, single lab\",\n      \"pmids\": [\"34400514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Crystal structure at 2.7 Å of the tapasin-ERp57 heterodimer in complex with peptide-receptive MHC class I reveals the molecular details of client recognition: tapasin-ERp57 engages MHC I clients through defined contacts, with elements indispensable for peptide proofreading. ERp57 forms a stable disulfide-linked heterodimer with tapasin in this editing complex.\",\n      \"method\": \"X-ray crystallography (2.7 Å resolution), structural analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure of the functional complex with mechanistic analysis of key interaction elements\",\n      \"pmids\": [\"36104323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the context of HFHF diet-induced liver damage, lipotoxicity and glucotoxicity promote MHC-II presentation of PDIA3 peptides. Passive transfer of PDIA3-specific T cells or PDIA3-specific antibodies exacerbates hepatocyte death in HFHF-fed but not control-diet mice, demonstrating that PDIA3-directed immune autoreactivity contributes to hepatic damage.\",\n      \"method\": \"MHC-II immunopeptidome analysis, adoptive transfer of PDIA3-specific T cells and antibodies, hepatic transaminase measurement, antigen-specific proliferation assay\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — adoptive transfer experiments establish causal role of PDIA3 autoreactivity, multiple immunological readouts, in vivo validation\",\n      \"pmids\": [\"35984892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In adipose tissue macrophages (iMAMs), ATF4 acts as a metabolic stress sensor that transcribes PDIA3; PDIA3 then imposes redox control on RhoA activity, strengthening pro-inflammatory and migratory properties of iMAMs through RhoA-YAP signaling. Pdia3 siRNA-loaded liposomes in vivo repress adipose inflammation and HFD-induced obesity.\",\n      \"method\": \"Single-nucleus RNA sequencing, ChIP assay (ATF4 binding to Pdia3 promoter), RhoA activity assay, YAP signaling analysis, siRNA-loaded liposomes in vivo, high-fat diet model\",\n      \"journal\": \"Cell metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transcriptional regulation confirmed by ChIP, downstream signaling mechanism (RhoA-YAP) established, in vivo therapeutic validation with siRNA liposomes\",\n      \"pmids\": [\"39293433\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PDIA3 (ERp57) is an ER-resident thiol-disulfide oxidoreductase with four structural domains (a, b, b', a') that catalyzes disulfide bond formation, reduction, and isomerization in newly synthesized glycoproteins via the calnexin/calreticulin cycle; at the plasma membrane it functions as the 1,25(OH)2D3-MARRS receptor in caveolae, initiating rapid signaling through PLAA–PLA2–PKC–ERK cascades; it forms a covalent disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex to enable peptide proofreading; it co-translocates with calreticulin to the cell surface during immunogenic cell death; it regulates STAT3 signaling from the ER lumen, exerts Bak-dependent proapoptotic activity at mitochondria, modulates thrombus formation via redox regulation of platelet αIIbβ3 and coagulation, specifically oxidizes and inactivates extracellular transglutaminase 2, and in the nucleus binds specific DNA sequences through a redox-dependent conformational change of its C-terminal a' domain to regulate stress-response gene transcription.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PDIA3 (ERp57/GRP58) is a stress-inducible, ER-resident thiol-disulfide oxidoreductase that catalyzes disulfide formation, reduction, and isomerization in newly synthesized glycoproteins, functioning within the calnexin/calreticulin chaperone cycle [#0, #7, #9]. It is recruited to substrates through a glucose-trimming-dependent association with calnexin and calreticulin mediated by its b' domain, and traps mixed-disulfide intermediates with heavily glycosylated, multi-disulfide clients whose folding is impaired upon ERp57 loss [#1, #9, #11]. Specific clients include MHC class I heavy chain—where ERp57 forms a covalent disulfide-linked heterodimer with tapasin in the peptide-loading complex to enable peptide proofreading, as resolved by crystallography of the editing complex—as well as CD1d, prion protein, and influenza hemagglutinin, the last requiring ERp57 for oxidative folding and oligomerization [#2, #4, #13, #33, #39, #43]. Beyond canonical folding, ERp57 modulates STAT3 signaling from the ER lumen in a manner rescued by ER-targeted but not cytoplasmic protein, and its homozygous disruption is embryonic-lethal [#18]. At the cell surface and in caveolae, PDIA3 acts as the 1,25(OH)2D3-MARRS receptor, partnering with caveolin-1, VDR, and PLAA to drive rapid PLA2–PKC–ERK signaling, calcium uptake, and PGE2 release, with chaperone-domain residues (K214, R282, C406) required for these membrane responses [#15, #21, #22, #25, #27, #29]. Extracellularly, ERp57 governs redox-dependent processes including platelet aIIbb3 activation, thrombosis, and fibrin deposition, and it specifically oxidizes and inactivates transglutaminase 2 [#24, #32, #37]. PDIA3 additionally exhibits Bak-dependent proapoptotic activity at mitochondria and, in the nucleus, binds specific DNA sequences via a redox-dependent conformational change of its C-terminal a' domain to participate in stress-response and transcription-factor complexes [#5, #14, #34]. Transcription of Pdia3 is itself driven by CLOCK and ATF4, integrating it into circadian and metabolic-stress programs [#36, #45].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that the protein was a genuine ER oxidoreductase, not the phospholipase C it had been misidentified as, defined the molecular activity that anchors all later work.\",\n      \"evidence\": \"Antibody identification, sequencing, COS-cell expression, and insulin-reduction enzymatic assay\",\n      \"pmids\": [\"8109975\", \"8050492\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endogenous substrates not yet identified\", \"Mechanism of substrate selection unknown\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Showing ERp57 binds glycoproteins in a glucose-trimming-dependent manner with calnexin/calreticulin placed it within the lectin-chaperone folding cycle.\",\n      \"evidence\": \"Co-IP, pulse-chase, and glucosidase inhibitor treatment\",\n      \"pmids\": [\"9153243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific catalytic contribution to client disulfides not yet measured\", \"Domain mediating chaperone binding not defined\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identification of nuclear ERp57 bound to DNA and localization of redox-dependent DNA-binding to the a' domain opened an unexpected nuclear/transcriptional role.\",\n      \"evidence\": \"In vivo DNA-protein cross-linking, nuclear fractionation, and recombinant deletion-mutant DNA-binding assays\",\n      \"pmids\": [\"11948688\", \"12083768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence on transcription not demonstrated\", \"How an ER protein reaches the nucleus unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Biophysical characterization of the four-domain architecture and quantitative redox potentials defined the catalytic capacity for reduction, isomerization, and oxidation.\",\n      \"evidence\": \"Analytical ultracentrifugation, in vitro thiol-disulfide exchange, and redox potential measurement of purified protein\",\n      \"pmids\": [\"14871896\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain assignment of substrate vs partner binding not yet established\", \"In-cell relevance of measured potentials not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Knockout-validated substrate trapping and b'-domain mapping consolidated the calnexin/calreticulin-dependent folding mechanism and explained partner specificity.\",\n      \"evidence\": \"Mixed-disulfide trapping in ERp57 knockout cells, chaperone-interaction perturbation, and domain analysis\",\n      \"pmids\": [\"17170699\", \"17215875\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Not all multi-disulfide substrates depend on calnexin/calreticulin\", \"Full client repertoire incomplete\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolving the covalent ERp57-tapasin-MHC I trimeric complex and the redox-driven intermolecular a'-disulfide mechanism of DNA binding mechanistically separated the folding and nuclear activities.\",\n      \"evidence\": \"Disulfide-complex isolation with MHC I cysteine mutagenesis; C406S mutagenesis and thioredoxin-reductase reversal of a'-domain dimers\",\n      \"pmids\": [\"17459881\", \"17283067\", \"17061245\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of nuclear vs ER pools unquantified\", \"Direct transcriptional targets not yet functionally validated\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating ER-luminal control of STAT3 and obligate CRT co-translocation during immunogenic cell death extended ERp57 beyond folding into signaling and immunity.\",\n      \"evidence\": \"Compartment-targeted rescue in gene-trap knockout mice for STAT3; CRT point-mutant rescue, knockdown, and tumor models for surface translocation\",\n      \"pmids\": [\"20022947\", \"18464797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which luminal ERp57 alters STAT3 unclear\", \"Route of co-translocation to the cell surface undefined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Genetic and structure-function dissection established PDIA3 as the essential 1,25(OH)2D3-MARRS receptor mediating rapid caveolar membrane signaling and calcium uptake.\",\n      \"evidence\": \"Tissue-specific conditional knockouts (intestine, osteoblast lineage), ligand binding analysis, and bidirectional silencing/overexpression with PKC/PKA/calcium readouts\",\n      \"pmids\": [\"20682787\", \"20843786\", \"20576531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an oxidoreductase transduces a steroid ligand signal mechanistically unresolved\", \"Surface targeting/orientation of PDIA3 incompletely defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Mapping the caveolar receptor module (VDR, caveolin-1, PLAA) defined an interdependent two-receptor system for vitamin D rapid responses and photoprotection.\",\n      \"evidence\": \"Reciprocal co-IP, multi-component silencing, and downstream PLA2/c-Src/thymine-dimer readouts\",\n      \"pmids\": [\"23896121\", \"22322599\", \"22484374\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ligand-binding residues on PDIA3 not mapped\", \"Topology coordinating extracellular PLAA with intracellular effectors unclear\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Tissue-specific knockouts plus active-site mutagenesis established the extracellular redox role of ERp57 in platelet activation, thrombosis, and fibrin deposition.\",\n      \"evidence\": \"Platelet- and endothelial-specific knockouts, laser- and FeCl3-thrombosis models, inhibitory antibodies, and active-site mutants\",\n      \"pmids\": [\"22207737\", \"22168334\", \"25156521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of all relevant surface redox substrates beyond aIIbb3 incomplete\", \"Source of surface/extracellular ERp57 not fully defined\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Reconstitution and substrate work defined discrete cytoprotective/proapoptotic and proteostatic functions, including Bak-dependent apoptosis and PrP maturation control.\",\n      \"evidence\": \"In vitro reconstitution with purified PDIA3 in Bak/Bax knockout systems; conditional KO and transgenic mice for PrP glycoforms\",\n      \"pmids\": [\"25697356\", \"26170458\", \"26361352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How an ER protein engages mitochondrial Bak mechanistically unclear\", \"Physiological trigger of proapoptotic vs cytoprotective modes undefined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Quantitative kinetics identified TG2 as a specific extracellular oxidation target, demonstrating ERp57 acts as a dedicated redox regulator of a secreted enzyme.\",\n      \"evidence\": \"In vitro oxidation with purified proteins, rate-constant measurement, and siRNA in HUVECs\",\n      \"pmids\": [\"29305423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological contexts where ERp57 oxidizes TG2 in vivo not established\", \"Other extracellular substrates not catalogued\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defining the CLOCK transcriptional input and influenza HA folding requirement linked PDIA3 expression and client folding to circadian/host-pathogen physiology.\",\n      \"evidence\": \"ChIP/luciferase and in vivo rescue for CLOCK regulation; co-IP, inhibitor, and lung-epithelial conditional KO for HA folding\",\n      \"pmids\": [\"27883226\", \"30735910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Breadth of CLOCK-driven PDIA3 functions unknown\", \"Therapeutic window of PDIA3 inhibition in infection undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of an ATF4–PDIA3–RhoA–YAP axis in adipose macrophages established PDIA3 as a redox effector in metabolic-stress inflammation and a therapeutic target.\",\n      \"evidence\": \"snRNA-seq, ATF4 promoter ChIP, RhoA/YAP signaling assays, and in vivo siRNA-liposome knockdown in a high-fat-diet model\",\n      \"pmids\": [\"39293433\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Redox mechanism by which PDIA3 controls RhoA not fully resolved\", \"Generality across macrophage populations untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single ER oxidoreductase is partitioned and targeted across ER lumen, plasma membrane/caveolae, mitochondria, nucleus, and extracellular space to execute its distinct functions remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trafficking signals beyond KDEL/myristoylation incompletely defined\", \"Quantitative balance among compartmental pools unknown\", \"Whether catalytic redox activity underlies all noncanonical roles untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 1, 7, 9, 37]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [7, 24, 37]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [1, 9, 11, 33, 39]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [3, 5, 14, 12]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [21, 22]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 9, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [15, 21, 24, 25]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [3, 8, 12, 14]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [17, 34]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [37, 24, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 9, 39]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2, 13, 16, 43, 44]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [24, 32]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [18, 21, 25, 30, 45]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [20, 34]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [8, 12, 36, 40]}\n    ],\n    \"complexes\": [\n      \"MHC class I peptide-loading complex\",\n      \"calnexin/calreticulin chaperone cycle\",\n      \"1,25D3-MARRS caveolar receptor complex\"\n    ],\n    \"partners\": [\n      \"TAPBP\",\n      \"CALR\",\n      \"CANX\",\n      \"PLAA\",\n      \"VDR\",\n      \"CAV1\",\n      \"STAT3\",\n      \"TGM2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}