{"gene":"PDIA3","run_date":"2026-04-29T11:37:58","timeline":{"discoveries":[{"year":1998,"finding":"ERp57 is a component of the MHC class I peptide-loading complex, associating with calreticulin and calnexin to assist MHC class I folding at a critical step in peptide loading.","method":"Co-immunoprecipitation, biochemical fractionation","journal":"Current Biology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP identifying ERp57 in the peptide-loading complex, replicated across multiple subsequent studies","pmids":["9637923"],"is_preprint":false},{"year":1997,"finding":"ERp57 interacts specifically with N-glycosylated integral membrane proteins in a glucose-trimming-dependent manner, acting in concert with calnexin and calreticulin to modulate glycoprotein folding.","method":"Co-immunoprecipitation, glycosylation inhibitor experiments","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — direct biochemical interaction studies with glycosylation-dependent controls, replicated by other labs","pmids":["9153243"],"is_preprint":false},{"year":2003,"finding":"ERp57's domain structure consists of four domains (abb'a'); its b' domain mediates interaction with calreticulin/calnexin P domains, and multiple domains are required for calreticulin association. ERp57 catalyzes oxidative folding of glycoproteins including RNase A, though less effectively than PDI.","method":"Limited proteolysis, N-terminal sequencing, recombinant domain expression, chemical cross-linking, CD spectroscopy, electrospray mass spectrometry","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with domain mutagenesis and multiple biophysical methods in a single study","pmids":["14732712"],"is_preprint":false},{"year":2006,"finding":"ERp57 deletion impairs post-translational oxidative folding of influenza hemagglutinin (an obligate calnexin substrate) without affecting co-translational disulfide formation; ERp72 partially compensates for orphan ERp57 substrates.","method":"ERp57 knockout cell lines, pulse-chase folding assays, ER stress markers","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined folding phenotype and multiple substrate comparisons","pmids":["16407314"],"is_preprint":false},{"year":2007,"finding":"ERp57 forms a stable disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex; a novel trimeric complex of MHC class I heavy chain–ERp57–tapasin is formed via ERp57's interaction with the MHC class I peptide-binding groove, and ERp57 and PDI act in concert to regulate MHC class I redox status during antigen presentation.","method":"Co-immunoprecipitation, site-directed mutagenesis of cysteine residues, intracellular redox manipulation","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — direct mutagenesis identifying disulfide linkage, combined with Co-IP and functional validation","pmids":["17459881"],"is_preprint":false},{"year":2006,"finding":"ERp57 interacts with Ref-1/APE in vivo (co-immunoprecipitation confirmed in three cell types); ERp57 reduced by the thioredoxin-reductase/thioredoxin system stimulates AP-1 binding to its consensus DNA sequence, and ERp57 overexpression protects cells against hydrogen peroxide-induced killing, indicating cooperative activity with Ref-1 in reductive activation of transcription factors.","method":"Co-immunoprecipitation, EMSA, stable transfection/overexpression, cell viability assays","journal":"Free Radical Biology & Medicine","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP replicated across cell lines plus functional in vitro assay, single lab","pmids":["16962936"],"is_preprint":false},{"year":2004,"finding":"ERp57 is found in STAT3-DNA complexes bound to the α2-macroglobulin gene enhancer; an anti-ERp57 antibody inhibits STAT3 binding to its consensus sequence on DNA, indicating ERp57 is a necessary component of the DNA-bound STAT3 complex.","method":"EMSA, DNA affinity experiments, chromatin immunoprecipitation","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 — multiple DNA-binding techniques in two cell types, single lab","pmids":["15451439"],"is_preprint":false},{"year":2009,"finding":"ERp57 depletion in M14 melanoma cells decreases STAT3 phosphorylation on tyrosine 705 and completely suppresses IL-6-induced CRP expression; ERp57 is required both at the site of STAT3 phosphorylation and at the nuclear level for STAT3-dependent gene regulation.","method":"siRNA knockdown, ChIP, Western blot, RT-PCR, in vitro DNA-binding assays","journal":"Archives of Biochemistry and Biophysics","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, knockdown, phosphorylation assay), single lab","pmids":["19995546"],"is_preprint":false},{"year":2002,"finding":"The DNA-binding activity of ERp57 resides in its C-terminal a' domain, and this binding is strongly dependent on the oxidized redox state of the protein.","method":"Recombinant domain expression, deletion mutagenesis, in vitro DNA-binding assays","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 1–2 — domain deletion mutagenesis with in vitro functional assay, single lab","pmids":["12083768"],"is_preprint":false},{"year":2007,"finding":"ERp57 C-terminal a' domain DNA-binding activity depends on redox-dependent conformational change: oxidation drives formation of an intermolecular homodimer via disulfide bridges between active-site cysteines (not intramolecular), and mutation of C406 (first cysteine of –CGHC– motif) abolishes DNA binding. NADH-dependent thioredoxin reductase can reduce and thus inactivate the dimer.","method":"Site-directed mutagenesis, recombinant protein biochemistry, mass spectrometry, thioredoxin reductase assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis and multiple orthogonal biochemical methods","pmids":["17283067"],"is_preprint":false},{"year":2007,"finding":"ERp57 binds specific DNA sequences in vivo in HeLa cells; chromatin-immunoprecipitated targets include non-coding regions of identified genes, two of which encode DNA repair proteins, suggesting ERp57 participates 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 — ChIP with sequence identification in intact cells, single lab","pmids":["17061245"],"is_preprint":false},{"year":2008,"finding":"ERp57 co-translocates with calreticulin to the plasma membrane surface in anthracycline-induced immunogenic apoptosis; direct protein-protein interaction between CRT and ERp57 is strictly required for their co-translocation, as CRT point mutants failing to interact with ERp57 cannot restore ERp57 surface exposure. ERp57 knockdown abrogates CRT surface exposure and renders tumors resistant to anthracycline chemotherapy in vivo.","method":"Mass spectrometry, immunofluorescence, co-immunoprecipitation, CRT point mutants, shRNA knockdown, in vivo mouse tumor models","journal":"Cell Death and Differentiation","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods including mutagenesis, in vitro and in vivo validation, replicated across conditions","pmids":["18464797"],"is_preprint":false},{"year":2009,"finding":"PDIA3 is essential for H2AX phosphorylation (γ-H2AX) in response to cytarabine-induced DNA damage; PDIA3 knockdown abolishes γ-H2AX accumulation while leaving p53 phosphorylation intact, placing PDIA3 in a distinct branch of the DNA damage response.","method":"siRNA knockdown, Western blot, immunofluorescence microscopy","journal":"Molecular Cancer Therapeutics","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with specific molecular endpoint (γ-H2AX), single lab","pmids":["19372559"],"is_preprint":false},{"year":2010,"finding":"PDIA3 is located in caveolae (co-localizing with lipid rafts and caveolin-1) at the plasma membrane of osteoblasts and mediates 1,25(OH)2D3-induced rapid PLA2-dependent PGE2 release and PKC activation; silencing PDIA3 abolishes these responses while overexpression augments them.","method":"Confocal co-localization with caveolin-1, siRNA silencing, overexpression, PKC and PGE2 activity assays, gene expression analysis","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — loss- and gain-of-function with defined signaling readouts, multiple downstream endpoints, single lab but comprehensive","pmids":["20843786"],"is_preprint":false},{"year":2010,"finding":"Homozygous Pdia3 disruption causes early embryonic lethality; heterozygous Pdia3+/- mice show skeletal abnormalities; in osteoblast-like cells, Pdia3 silencing abolishes 1,25(OH)2D3-induced rapid PKC activation while overexpression augments it, confirming Pdia3 mediates membrane-initiated 1,25(OH)2D3 signaling in bone.","method":"Gene knockout mouse, µCT analysis, siRNA, overexpression, PKC activity assays","journal":"Journal of Steroid Biochemistry and Molecular Biology","confidence":"High","confidence_rationale":"Tier 2 — in vivo KO phenotype corroborated by cellular loss/gain-of-function with defined molecular readout","pmids":["20576531"],"is_preprint":false},{"year":2013,"finding":"PDIA3 co-localizes and interacts with VDR and caveolin-1 at the plasma membrane of osteoblasts; both PDIA3 and VDR interact with caveolin-1 by immunoprecipitation; PDIA3 interacts with PLAA whereas VDR interacts with c-Src; silencing either receptor or caveolin-1 inhibits both PLA2 and c-Src activation, demonstrating interdependent function of the two receptors in rapid membrane responses to 1,25(OH)2D3.","method":"Co-immunoprecipitation, confocal co-localization, siRNA silencing, kinase activity assays","journal":"Cellular Signalling","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP plus functional silencing experiments with defined signaling readouts","pmids":["23896121"],"is_preprint":false},{"year":2013,"finding":"Chaperone functional domains of PDIA3 (K214/R282 calreticulin-interaction sites and C406 isomerase catalytic site) and myristoylation are required for 1,25(OH)2D3-induced PKC activation at the plasma membrane; PDIA3 lacking the KDEL ER-retention signal shows increased plasma membrane localization but the stimulatory effect on PKC requires intact chaperone domains.","method":"Site-directed mutagenesis, overexpression of mutant constructs, PKC activity assays, subcellular fractionation","journal":"Molecular Endocrinology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of catalytic and interaction domains with direct functional readout","pmids":["23660595"],"is_preprint":false},{"year":2011,"finding":"ERp57 is expressed on the platelet surface and is required for platelet aggregation, hemostasis, and thrombosis; inhibitory anti-ERp57 antibody blocks ERp57 activity, inhibits αIIbβ3 activation and P-selectin expression, prolongs bleeding time, and inhibits FeCl3-induced thrombosis in mice. Catalytically inactive ERp57 inhibits platelet aggregation.","method":"Inhibitory antibody, recombinant ERp57 addition, tail bleeding assay, in vivo thrombosis model, flow cytometry","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — multiple independent antibodies and catalytically inactive mutant used in vitro and in vivo, mechanistically rigorous","pmids":["22207737"],"is_preprint":false},{"year":2014,"finding":"ERp57 is required for fibrin deposition in vivo; platelet-specific (Pf4-Cre) and endothelial-specific (Tie2-Cre) conditional ERp57 knockout each reduce fibrin deposition; ERp57 isomerase activity of the second active site is required for both fibrin deposition and platelet accumulation; recombinant ERp57 corrects the fibrin deposition defect, indicating a direct effect on coagulation.","method":"Conditional knockout mice, laser-induced thrombosis intravital microscopy, inhibitory antibody, recombinant active-site mutant ERp57, in vitro thrombin generation assay","journal":"Journal of Thrombosis and Haemostasis","confidence":"High","confidence_rationale":"Tier 1–2 — multiple conditional KO models, active-site mutants, and in vivo rescue experiments","pmids":["25156521"],"is_preprint":false},{"year":2015,"finding":"ERp57 physically interacts with the prion protein (PrP) and controls its maturation and steady-state levels; ERp57 gain- and loss-of-function in cell culture alters PrP levels; conditional nervous system ERp57 knockout reduces mono- and non-glycosylated PrP forms in brain; ERp57 transgenic mice show increased endogenous PrP levels.","method":"Co-immunoprecipitation, gain/loss-of-function cell culture, conditional knockout mouse, Western blot","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 2 — Co-IP plus in vivo conditional KO and transgenic corroboration","pmids":["26170458"],"is_preprint":false},{"year":2018,"finding":"ERp57 oxidatively inactivates transglutaminase 2 (TG2) via the allosteric Cys370–Cys371 disulfide bond with a rate constant 400–2000-fold higher than small-molecule oxidants; ERp57 co-localizes with extracellular TG2 in endothelial cells; siRNA-mediated ERp57 knockdown increases TG2 transamidation activity extracellularly, establishing ERp57 as the physiological oxidative inactivator of TG2.","method":"In vitro enzymatic assay with rate constant measurement, siRNA knockdown, immunofluorescence co-localization, transamidation activity assay","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — reconstituted in vitro kinetics with mutagenesis context plus siRNA knockdown confirmation","pmids":["29305423"],"is_preprint":false},{"year":2019,"finding":"PDIA3 directly interacts with influenza A virus hemagglutinin (HA) and is required for its efficient disulfide bond formation and oligomerization (maturation); lung epithelial-specific PDIA3 deletion reduces viral burden and lung inflammation in mice; PDI inhibitor LOC14 decreases intramolecular HA disulfide bonds and viral replication in H1N1 and H3N2 infection.","method":"Co-immunoprecipitation, conditional (epithelial-specific) PDIA3 knockout mouse, viral load quantification, PDI inhibitor treatment, Western blot for disulfide status","journal":"Redox Biology","confidence":"High","confidence_rationale":"Tier 2 — direct protein interaction confirmed with in vivo conditional KO and pharmacological inhibitor corroborating the functional requirement","pmids":["30735910"],"is_preprint":false},{"year":2019,"finding":"Vitamin D3 activates PDIA3 as a receptor at the cell surface of gastric epithelial cells, promoting nuclear translocation of a PDIA3-STAT3 protein complex and subsequent upregulation of MCOLN3 channels, leading to enhanced lysosomal Ca2+ release, restoration of lysosomal acidification, and autolysosomal clearance of Helicobacter pylori.","method":"PDIA3 CRISPR knockout and siRNA knockdown, neutralizing antibody, co-immunoprecipitation of PDIA3-STAT3, ChIP-PCR, Ca2+ imaging, CFU assays in vitro and in vivo","journal":"Autophagy","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO and knockdown with multiple downstream mechanistic assays including Co-IP, ChIP, and Ca2+ measurements","pmids":["30612517"],"is_preprint":false},{"year":2022,"finding":"Crystal structure (2.7 Å) of the tapasin–ERp57 heterodimer in complex with peptide-receptive MHC class I reveals atomic details of client recognition and the mechanistic basis for tapasin's selector function in peptide proofreading; ERp57 is disulfide-linked to tapasin via its redox active site and stabilizes the complex.","method":"X-ray crystallography at 2.7 Å, functional mutagenesis validation","journal":"Nature Communications","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional validation, defines atomic mechanism","pmids":["36104323"],"is_preprint":false},{"year":2007,"finding":"ERp57-deficient MHC class I peptide-loading complexes (using tapasin C95A mutant unable to disulfide-link ERp57) are prone to ER aggregation, demonstrating that ERp57 is required for the stability of the core loading complex.","method":"Fluorescently-tagged tapasin mutant expression, FRET analysis, confocal microscopy, cell fractionation","journal":"Traffic","confidence":"Medium","confidence_rationale":"Tier 2 — tapasin mutant system with live-cell imaging and FRET, single lab","pmids":["17822402"],"is_preprint":false},{"year":2016,"finding":"The circadian gene Clock activates Pdia3 transcription by binding the E-box promoter element; forced expression of Pdia3 rescues osteogenic disorders and inhibits apoptosis in Clock mutant mice; siRNA ablation of PDIA3 blocks compensatory effects of Clock overexpression in osteoblasts.","method":"Luciferase reporter assay, ChIP, in vivo forced expression/knockout in ClockΔ19 mutant mice, siRNA knockdown","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP and luciferase confirm direct transcriptional regulation, with in vivo rescue experiments","pmids":["27883226"],"is_preprint":false},{"year":2021,"finding":"ERp57 is a host factor required for hepatitis B virus (HBV) membrane fusion and infection; computational modeling identified an allosteric cross-strand disulfide bond in the HBV S glycoprotein, and ERp57-mediated thiol/disulfide exchange triggers its isomerization, exposing the fusion peptide in preS1.","method":"Computational modeling, experimental infection assays, ERp57 functional perturbation","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2–3 — combined computational and experimental approach establishing host factor role; single study","pmids":["34190687"],"is_preprint":false},{"year":2024,"finding":"In adipose tissue macrophages, ATF4 transcribes PDIA3, which imposes redox control on RhoA activity and strengthens pro-inflammatory and migratory properties of a maladaptive macrophage subpopulation (iMAMs) through RhoA-YAP signaling; siRNA-loaded liposomes targeting Pdia3 repress adipose inflammation and HFD-induced obesity.","method":"Single-nucleus RNA sequencing, ATF4 ChIP (inferred from transcription), PDIA3 siRNA liposome delivery in vivo, RhoA activity assays, YAP signaling readouts","journal":"Cell Metabolism","confidence":"Medium","confidence_rationale":"Tier 2 — snRNA-seq defining subpopulation plus in vivo siRNA with defined signaling pathway; single study","pmids":["39293433"],"is_preprint":false},{"year":2015,"finding":"PDIA3 knockdown and ENO1 knockdown in primary murine alveolar epithelial type II cells reduce ATI cell marker T1α expression, indicating PDIA3 is required downstream of Wnt/β-catenin signaling for ATII-to-ATI trans-differentiation.","method":"siRNA knockdown, proteomics (mass spectrometry), immunoblotting, pharmacological Wnt inhibition","journal":"Disease Models & Mechanisms","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA knockdown with defined cell-fate marker readout, corroborated by pharmacological inhibition and in vivo injury model","pmids":["26035385"],"is_preprint":false},{"year":2015,"finding":"ERp57 overexpression in transgenic mice enhances locomotor recovery, myelin removal, macrophage infiltration, and axonal regeneration after sciatic nerve injury, demonstrating a functional role for ERp57 in peripheral nerve regeneration.","method":"ERp57 transgenic mouse, sciatic nerve crush model, behavioral testing, histological analysis","journal":"PLOS ONE","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic overexpression with defined functional phenotype, single lab","pmids":["26361352"],"is_preprint":false},{"year":2014,"finding":"Wnt5a signals through a CaMKII/PLA2/PGE2/PKC cascade in osteoblasts that requires PDIA3, PLAA, and VDR; PDIA3 membrane complex components (Pdia3, PLAA, caveolin-1, CaM) physically interact with Wnt5a receptors/co-receptors (ROR2, FZD2, FZD5) as shown by co-immunoprecipitation, and these interactions change with ligand treatment.","method":"Co-immunoprecipitation, siRNA silencing, pharmacological inhibitors, PKC activity assays","journal":"Biochimica et Biophysica Acta","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP plus multiple silencing experiments showing pathway interdependence, single lab","pmids":["24946135"],"is_preprint":false},{"year":2018,"finding":"Punicalagin (from pomegranate) binds purified PDIA3 with high affinity and acts as a non-competitive inhibitor of PDIA3 reductase activity in vitro; this inhibitory effect is reduced in PDIA3-silenced neuroblastoma cells, confirming PDIA3 as the relevant target.","method":"Fluorescence quenching, isothermal titration calorimetry, in vitro reductase assay, PDIA3 siRNA knockdown, cell viability assay","journal":"Biochimie","confidence":"Medium","confidence_rationale":"Tier 1 — in vitro enzymatic inhibition with ITC binding confirmation and cellular target validation via knockdown","pmids":["29425676"],"is_preprint":false},{"year":2019,"finding":"ERp57 upregulation in clear cell renal carcinoma cells binds STAT3 protein and enhances STAT3-mediated transcriptional activity of ILF3; ILF3 in turn binds ERp57 mRNA to enhance its stability, creating a positive feedback loop (ERp57/STAT3/ILF3) that promotes ccRCC proliferation.","method":"Co-immunoprecipitation, proximity ligation assay, ChIP, RIP, oligo pull-down, promoter luciferase assay, in vivo xenograft","journal":"Journal of Experimental & Clinical Cancer Research","confidence":"Medium","confidence_rationale":"Tier 2 — multiple interaction assays (Co-IP, PLA, ChIP, RIP) in single lab establishing feedback mechanism","pmids":["31747963"],"is_preprint":false},{"year":2020,"finding":"PDIA3 knockdown in trophoblasts inhibits MDM2 expression and consequently elevates p53 and p21, promoting apoptosis and inhibiting proliferation; overexpression of PDIA3 reverses these effects, placing PDIA3 upstream of the MDM2/p53/p21 pathway in trophoblast biology.","method":"siRNA knockdown, PDIA3 overexpression, RNA sequencing, Western blot, flow cytometry, EdU proliferation assay","journal":"Reproduction","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal gain/loss-of-function with defined molecular pathway readout, single lab","pmids":["32585639"],"is_preprint":false},{"year":2021,"finding":"PDIA3 inhibition in club cells of the lung attenuates osteopontin (SPP1) production and bleomycin-induced lung fibrosis; SPP1 is identified as a major PDIA3 interactor in fibrosis by proteomics; club cell-specific Pdia3 ablation decreases parenchymal club cells and fibrosis in mice.","method":"Club cell-specific PDIA3 knockout, PDI inhibitor LOC14, proteomics/interactome analysis, bleomycin mouse fibrosis model, SPP1 blocking","journal":"Thorax","confidence":"Medium","confidence_rationale":"Tier 2 — cell-type-specific KO with defined mechanistic interactor identified by proteomics and in vivo validation","pmids":["34400514"],"is_preprint":false}],"current_model":"PDIA3 (ERp57/GRP58) is a multifunctional thiol-disulfide oxidoreductase of the PDI family that: (1) acts as a glycoprotein-specific foldase in the ER calnexin/calreticulin cycle; (2) forms a disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex to stabilize it and facilitate peptide editing (structure resolved at 2.7 Å); (3) co-translocates to the cell surface with calreticulin during immunogenic cell death to elicit anti-tumor immunity; (4) functions at the plasma membrane in caveolae as a receptor for 1α,25(OH)2D3, activating PLA2/PKC/ERK signaling via PLAA and interdependently with VDR; (5) oxidatively inactivates extracellular transglutaminase 2 via the Cys370–Cys371 allosteric disulfide; (6) regulates platelet aggregation, hemostasis, and fibrin deposition through its isomerase activity; (7) participates in nuclear regulation of STAT3 target genes and DNA damage signaling (γ-H2AX); and (8) is required for influenza HA maturation and HBV membrane fusion via thiol/disulfide exchange."},"narrative":{"teleology":[{"year":1997,"claim":"Establishing that ERp57 is a glycoprotein-specific chaperone resolved the question of how the calnexin/calreticulin cycle recruits an oxidoreductase: ERp57 interacts selectively with N-glycosylated membrane proteins in a glucose-trimming-dependent manner.","evidence":"Co-immunoprecipitation with glycosylation inhibitor controls in mammalian cells","pmids":["9153243"],"confidence":"High","gaps":["Substrate specificity determinants beyond glycosylation not defined","No structural data on ERp57–lectin chaperone interface at this stage"]},{"year":1998,"claim":"Placing ERp57 inside the MHC class I peptide-loading complex answered how antigen presentation recruits an oxidoreductase and linked ER quality control to adaptive immunity.","evidence":"Reciprocal co-immunoprecipitation and biochemical fractionation of MHC class I complexes","pmids":["9637923"],"confidence":"High","gaps":["Nature of the ERp57–tapasin linkage unknown","Whether ERp57 catalytic activity is required for peptide loading not tested"]},{"year":2002,"claim":"Mapping DNA-binding activity to the oxidized a' domain revealed an unexpected nuclear function for an ER oxidoreductase, raising the question of how redox state toggles ERp57 between chaperone and transcriptional roles.","evidence":"Recombinant domain deletion mutagenesis with in vitro DNA-binding assays","pmids":["12083768"],"confidence":"Medium","gaps":["In vivo relevance of DNA binding not established","Mechanism of nuclear import undefined"]},{"year":2003,"claim":"Defining the four-domain (abb'a') architecture and mapping the calreticulin/calnexin interaction to the b' domain provided the structural framework for understanding how ERp57 is recruited to glycoprotein substrates.","evidence":"Limited proteolysis, recombinant domain expression, chemical cross-linking, CD spectroscopy, and mass spectrometry","pmids":["14732712"],"confidence":"High","gaps":["No high-resolution structure of ERp57–calreticulin complex","Catalytic efficiency relative to PDI only partially characterized"]},{"year":2004,"claim":"Demonstrating ERp57 within STAT3–DNA complexes on the α2-macroglobulin enhancer established that ERp57 participates directly in transcription factor–DNA assemblies, not merely in protein folding.","evidence":"EMSA, DNA affinity chromatography, and chromatin immunoprecipitation in two cell types","pmids":["15451439"],"confidence":"Medium","gaps":["Mechanism by which ERp57 modulates STAT3 DNA binding unknown","Whether ERp57 catalytic activity is required not tested"]},{"year":2006,"claim":"ERp57 knockout cells revealed that ERp57 is specifically required for post-translational (not co-translational) oxidative folding of influenza HA, delineating the temporal window of ERp57 action in the calnexin cycle.","evidence":"ERp57 knockout cell lines with pulse-chase folding assays for influenza HA and other substrates","pmids":["16407314"],"confidence":"High","gaps":["ERp72 partial compensation complicates full loss-of-function interpretation","Scope of ERp57-dependent substrates not comprehensively cataloged"]},{"year":2007,"claim":"Identifying the disulfide-linked ERp57–tapasin heterodimer and a trimeric ERp57–tapasin–MHC I heavy chain complex defined the redox chemistry at the heart of peptide loading, showing ERp57 directly engages the peptide-binding groove.","evidence":"Site-directed cysteine mutagenesis, co-immunoprecipitation, and intracellular redox manipulation","pmids":["17459881","17822402"],"confidence":"High","gaps":["Atomic structure not yet available","How ERp57 cooperates with PDI in MHC I redox regulation unclear"]},{"year":2007,"claim":"Showing that oxidation drives ERp57 a' domain homodimerization via active-site cysteines (with C406 essential) and that thioredoxin reductase reverses it defined a redox switch controlling DNA-binding competence.","evidence":"Site-directed mutagenesis, mass spectrometry, and thioredoxin reductase reduction assay on recombinant protein","pmids":["17283067"],"confidence":"High","gaps":["Physiological oxidant that activates the switch in vivo unknown","Genome-wide DNA binding targets not mapped"]},{"year":2008,"claim":"Demonstrating that ERp57 co-translocates with calreticulin to the cell surface during immunogenic cell death—and that their direct interaction is strictly required—established ERp57 as a gatekeeper of immunogenic signaling in cancer therapy.","evidence":"CRT point mutants abolishing ERp57 interaction, shRNA knockdown, mass spectrometry, and in vivo mouse tumor models with anthracycline treatment","pmids":["18464797"],"confidence":"High","gaps":["Mechanism of ER-to-surface translocation pathway undefined","Whether ERp57 catalytic activity is required for surface exposure not tested"]},{"year":2009,"claim":"Placing PDIA3 upstream of γ-H2AX but not p53 phosphorylation positioned it in a distinct branch of the DNA damage response, expanding its nuclear roles beyond transcription.","evidence":"siRNA knockdown with Western blot and immunofluorescence for γ-H2AX after cytarabine treatment","pmids":["19372559"],"confidence":"Medium","gaps":["Direct substrate or kinase target of PDIA3 in H2AX phosphorylation unknown","Single lab, single DNA-damaging agent tested","Whether the effect is through redox modulation of ATM/ATR not addressed"]},{"year":2010,"claim":"Localizing PDIA3 to caveolae and demonstrating it mediates rapid 1α,25(OH)₂D₃-induced PLA2/PKC signaling—abolished by silencing and augmented by overexpression—established PDIA3 as a membrane receptor for vitamin D₃ in bone.","evidence":"Confocal co-localization with caveolin-1, siRNA/overexpression, PKC and PGE₂ assays in osteoblasts; Pdia3 knockout mouse showing embryonic lethality and skeletal defects","pmids":["20843786","20576531"],"confidence":"High","gaps":["Direct ligand-binding site on PDIA3 for 1,25(OH)₂D₃ not structurally defined","Mechanism of PDIA3 escape from ER to plasma membrane not resolved"]},{"year":2011,"claim":"Showing that ERp57 isomerase activity on the platelet surface is required for αIIbβ3 activation, P-selectin expression, and in vivo hemostasis revealed an extracellular catalytic function of ERp57 in thrombosis.","evidence":"Inhibitory anti-ERp57 antibody, catalytically inactive mutant, tail bleeding assay, and FeCl₃ thrombosis model in mice","pmids":["22207737"],"confidence":"High","gaps":["Direct disulfide substrate on αIIbβ3 not identified","Mechanism of ERp57 secretion from platelets not defined"]},{"year":2013,"claim":"Demonstrating that PDIA3 and VDR form an interdependent caveolar signaling complex—with PDIA3 coupling to PLAA and VDR to c-Src—resolved how two receptors cooperate in rapid membrane vitamin D₃ responses and showed that chaperone domains and myristoylation are required for signaling.","evidence":"Reciprocal co-immunoprecipitation of PDIA3/VDR/caveolin-1, siRNA silencing of each component, site-directed mutagenesis of calreticulin-interaction and catalytic residues","pmids":["23896121","23660595"],"confidence":"High","gaps":["Structural basis of PDIA3–VDR interaction not defined","How myristoylation targets PDIA3 to caveolae not mechanistically resolved"]},{"year":2014,"claim":"Conditional platelet- and endothelial-specific ERp57 knockouts pinpointed the cell types and the specific active site (second CGHC motif) required for fibrin deposition, establishing ERp57 isomerase activity as a direct regulator of coagulation.","evidence":"Pf4-Cre and Tie2-Cre conditional knockouts, laser-induced thrombosis with intravital microscopy, recombinant active-site mutant rescue","pmids":["25156521"],"confidence":"High","gaps":["Coagulation factor substrate of the second active site not identified","Relative contribution of platelet vs. endothelial ERp57 not fully resolved"]},{"year":2018,"claim":"Kinetic demonstration that ERp57 oxidizes the Cys370–Cys371 allosteric disulfide of transglutaminase 2 at rates 400–2000-fold faster than small molecules identified ERp57 as the physiological extracellular inactivator of TG2.","evidence":"In vitro rate constant measurements, siRNA knockdown increasing extracellular TG2 activity, immunofluorescence co-localization in endothelial cells","pmids":["29305423"],"confidence":"High","gaps":["In vivo confirmation in TG2-dependent disease models not performed","Whether other PDI family members contribute to TG2 regulation not excluded"]},{"year":2019,"claim":"Lung epithelial-specific PDIA3 deletion reduced influenza viral burden, confirming PDIA3 as a host factor required for HA maturation in vivo and validating it as an antiviral target.","evidence":"Conditional epithelial-specific Pdia3 knockout mice infected with H1N1/H3N2, PDI inhibitor LOC14, co-immunoprecipitation of PDIA3–HA","pmids":["30735910"],"confidence":"High","gaps":["Whether PDIA3 inhibition affects other respiratory viruses not tested","Therapeutic window of PDI inhibitors in vivo not established"]},{"year":2019,"claim":"Linking PDIA3 to vitamin D₃-induced STAT3 nuclear translocation and MCOLN3-dependent lysosomal acidification for Helicobacter pylori clearance unified the membrane receptor and STAT3-regulatory functions of PDIA3 in a single signaling axis.","evidence":"CRISPR knockout and siRNA in gastric epithelial cells, co-immunoprecipitation of PDIA3–STAT3, ChIP-PCR for MCOLN3, Ca²⁺ imaging, bacterial CFU assays","pmids":["30612517"],"confidence":"High","gaps":["Whether this pathway operates in other cell types beyond gastric epithelium unknown","Direct ligand-binding evidence for 1,25(OH)₂D₃–PDIA3 at atomic level still lacking"]},{"year":2022,"claim":"The 2.7 Å crystal structure of the tapasin–ERp57 heterodimer with peptide-receptive MHC class I provided the atomic mechanism for peptide proofreading, showing how ERp57's disulfide linkage to tapasin stabilizes the editing complex.","evidence":"X-ray crystallography at 2.7 Å resolution with functional mutagenesis validation","pmids":["36104323"],"confidence":"High","gaps":["Dynamic conformational changes during peptide exchange not captured by static structure","Structure of the full six-component PLC (with TAP1/TAP2) not yet resolved"]},{"year":2024,"claim":"Identifying PDIA3 as an ATF4-transcribed effector that imposes redox control on RhoA–YAP signaling in inflammatory adipose macrophages extended PDIA3's extracellular thiol-exchange functions to metabolic inflammation.","evidence":"Single-nucleus RNA-seq, PDIA3 siRNA-loaded liposomes in vivo reducing adipose inflammation and HFD-induced obesity, RhoA activity and YAP signaling assays","pmids":["39293433"],"confidence":"Medium","gaps":["Direct RhoA disulfide substrate of PDIA3 not biochemically confirmed","Single study; independent replication pending","Whether the effect is cell-autonomous to macrophages not fully resolved"]},{"year":null,"claim":"Key unresolved questions include: the structural basis of 1α,25(OH)₂D₃ binding to PDIA3 at the plasma membrane, the mechanism by which PDIA3 escapes ER retention to reach the cell surface, and the identity of the coagulation factor disulfide substrates acted upon by ERp57's second active site during thrombosis.","evidence":"","pmids":[],"confidence":"Low","gaps":["No ligand-bound PDIA3 structure for vitamin D₃","ER-to-surface trafficking pathway undefined","Coagulation disulfide substrates not identified","Genome-wide catalog of ERp57-dependent glycoprotein substrates incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[1,2,3,4,17,18,20,21]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[2,3,9,17,18,20,31]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[8,9,10]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[7,13,22,27,32,33]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[13,14,15,16]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,1,2,3,4,23]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[11,13,15,16,17]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[17,18,20]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[6,7,8,9,10,22]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[5,7]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,4,11,23,24]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1,2,3,19,21]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[13,14,15,16,22,27,30]},{"term_id":"R-HSA-109582","term_label":"Hemostasis","supporting_discovery_ids":[17,18]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[11,33]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[22]}],"complexes":["MHC class I peptide-loading complex","Calnexin/calreticulin cycle","PDIA3-VDR-caveolin-1 membrane complex"],"partners":["CALR","CANX","TAPBP","STAT3","VDR","CAV1","PLAA","TGM2"],"other_free_text":[]},"mechanistic_narrative":"PDIA3 (ERp57/GRP58) is a thiol-disulfide oxidoreductase of the protein disulfide isomerase family that operates across multiple cellular compartments to catalyze oxidative folding, regulate redox-dependent signaling, and modulate immune recognition. In the ER, PDIA3 associates with calnexin and calreticulin via its b' domain to catalyze disulfide bond formation in glycoprotein substrates including influenza hemagglutinin and the prion protein, and forms a disulfide-linked heterodimer with tapasin that stabilizes the MHC class I peptide-loading complex and enables peptide proofreading, as resolved by a 2.7 Å crystal structure [PMID:9153243, PMID:14732712, PMID:17459881, PMID:36104323, PMID:26170458]. At the plasma membrane, PDIA3 localizes to caveolae where it functions as a 1α,25(OH)₂D₃ receptor that activates PLA2/PKC signaling interdependently with VDR, mediates platelet aggregation and fibrin deposition through its isomerase activity, oxidatively inactivates extracellular transglutaminase 2, and co-translocates with calreticulin during immunogenic cell death to promote anti-tumor immunity [PMID:20843786, PMID:23896121, PMID:22207737, PMID:25156521, PMID:29305423, PMID:18464797]. PDIA3 also participates in nuclear functions including redox-dependent DNA binding via its oxidized a' domain homodimer, regulation of STAT3 phosphorylation and STAT3-dependent transcription, and γ-H2AX-mediated DNA damage signaling [PMID:17283067, PMID:19995546, PMID:19372559]."},"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":"7650491","id":"PMC_7650491","title":"Existence 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complex, replicated across multiple subsequent studies\",\n      \"pmids\": [\"9637923\"],\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, acting in concert with calnexin and calreticulin to modulate glycoprotein folding.\",\n      \"method\": \"Co-immunoprecipitation, glycosylation inhibitor experiments\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical interaction studies with glycosylation-dependent controls, replicated by other labs\",\n      \"pmids\": [\"9153243\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ERp57's domain structure consists of four domains (abb'a'); its b' domain mediates interaction with calreticulin/calnexin P domains, and multiple domains are required for calreticulin association. ERp57 catalyzes oxidative folding of glycoproteins including RNase A, though less effectively than PDI.\",\n      \"method\": \"Limited proteolysis, N-terminal sequencing, recombinant domain expression, chemical cross-linking, CD spectroscopy, electrospray mass spectrometry\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with domain mutagenesis and multiple biophysical methods in a single study\",\n      \"pmids\": [\"14732712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ERp57 deletion impairs post-translational oxidative folding of influenza hemagglutinin (an obligate calnexin substrate) without affecting co-translational disulfide formation; ERp72 partially compensates for orphan ERp57 substrates.\",\n      \"method\": \"ERp57 knockout cell lines, pulse-chase folding assays, ER stress markers\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined folding phenotype and multiple substrate comparisons\",\n      \"pmids\": [\"16407314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 forms a stable disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex; a novel trimeric complex of MHC class I heavy chain–ERp57–tapasin is formed via ERp57's interaction with the MHC class I peptide-binding groove, and ERp57 and PDI act in concert to regulate MHC class I redox status during antigen presentation.\",\n      \"method\": \"Co-immunoprecipitation, site-directed mutagenesis of cysteine residues, intracellular redox manipulation\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — direct mutagenesis identifying disulfide linkage, combined with Co-IP and functional validation\",\n      \"pmids\": [\"17459881\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ERp57 interacts with Ref-1/APE in vivo (co-immunoprecipitation confirmed in three cell types); ERp57 reduced by the thioredoxin-reductase/thioredoxin system stimulates AP-1 binding to its consensus DNA sequence, and ERp57 overexpression protects cells against hydrogen peroxide-induced killing, indicating cooperative activity with Ref-1 in reductive activation of transcription factors.\",\n      \"method\": \"Co-immunoprecipitation, EMSA, stable transfection/overexpression, cell viability assays\",\n      \"journal\": \"Free Radical Biology & Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP replicated across cell lines plus functional in vitro assay, single lab\",\n      \"pmids\": [\"16962936\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ERp57 is found in STAT3-DNA complexes bound to the α2-macroglobulin gene enhancer; an anti-ERp57 antibody inhibits STAT3 binding to its consensus sequence on DNA, indicating ERp57 is a necessary component of the DNA-bound STAT3 complex.\",\n      \"method\": \"EMSA, DNA affinity experiments, chromatin immunoprecipitation\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple DNA-binding techniques in two cell types, single lab\",\n      \"pmids\": [\"15451439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ERp57 depletion in M14 melanoma cells decreases STAT3 phosphorylation on tyrosine 705 and completely suppresses IL-6-induced CRP expression; ERp57 is required both at the site of STAT3 phosphorylation and at the nuclear level for STAT3-dependent gene regulation.\",\n      \"method\": \"siRNA knockdown, ChIP, Western blot, RT-PCR, in vitro DNA-binding assays\",\n      \"journal\": \"Archives of Biochemistry and Biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, knockdown, phosphorylation assay), single lab\",\n      \"pmids\": [\"19995546\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The DNA-binding activity of ERp57 resides in its C-terminal a' domain, and this binding is strongly dependent on the oxidized redox state of the protein.\",\n      \"method\": \"Recombinant domain expression, deletion mutagenesis, in vitro DNA-binding assays\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — domain deletion mutagenesis with in vitro functional assay, single lab\",\n      \"pmids\": [\"12083768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 C-terminal a' domain DNA-binding activity depends on redox-dependent conformational change: oxidation drives formation of an intermolecular homodimer via disulfide bridges between active-site cysteines (not intramolecular), and mutation of C406 (first cysteine of –CGHC– motif) abolishes DNA binding. NADH-dependent thioredoxin reductase can reduce and thus inactivate the dimer.\",\n      \"method\": \"Site-directed mutagenesis, recombinant protein biochemistry, mass spectrometry, thioredoxin reductase assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis and multiple orthogonal biochemical methods\",\n      \"pmids\": [\"17283067\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57 binds specific DNA sequences in vivo in HeLa cells; chromatin-immunoprecipitated targets include non-coding regions of identified genes, two of which encode DNA repair proteins, suggesting ERp57 participates 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 — ChIP with sequence identification in intact cells, single lab\",\n      \"pmids\": [\"17061245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ERp57 co-translocates with calreticulin to the plasma membrane surface in anthracycline-induced immunogenic apoptosis; direct protein-protein interaction between CRT and ERp57 is strictly required for their co-translocation, as CRT point mutants failing to interact with ERp57 cannot restore ERp57 surface exposure. ERp57 knockdown abrogates CRT surface exposure and renders tumors resistant to anthracycline chemotherapy in vivo.\",\n      \"method\": \"Mass spectrometry, immunofluorescence, co-immunoprecipitation, CRT point mutants, shRNA knockdown, in vivo mouse tumor models\",\n      \"journal\": \"Cell Death and Differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods including mutagenesis, in vitro and in vivo validation, replicated across conditions\",\n      \"pmids\": [\"18464797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PDIA3 is essential for H2AX phosphorylation (γ-H2AX) in response to cytarabine-induced DNA damage; PDIA3 knockdown abolishes γ-H2AX accumulation while leaving p53 phosphorylation intact, placing PDIA3 in a distinct branch of the DNA damage response.\",\n      \"method\": \"siRNA knockdown, Western blot, immunofluorescence microscopy\",\n      \"journal\": \"Molecular Cancer Therapeutics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific molecular endpoint (γ-H2AX), single lab\",\n      \"pmids\": [\"19372559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PDIA3 is located in caveolae (co-localizing with lipid rafts and caveolin-1) at the plasma membrane of osteoblasts and mediates 1,25(OH)2D3-induced rapid PLA2-dependent PGE2 release and PKC activation; silencing PDIA3 abolishes these responses while overexpression augments them.\",\n      \"method\": \"Confocal co-localization with caveolin-1, siRNA silencing, overexpression, PKC and PGE2 activity assays, gene expression analysis\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss- and gain-of-function with defined signaling readouts, multiple downstream endpoints, single lab but comprehensive\",\n      \"pmids\": [\"20843786\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Homozygous Pdia3 disruption causes early embryonic lethality; heterozygous Pdia3+/- mice show skeletal abnormalities; in osteoblast-like cells, Pdia3 silencing abolishes 1,25(OH)2D3-induced rapid PKC activation while overexpression augments it, confirming Pdia3 mediates membrane-initiated 1,25(OH)2D3 signaling in bone.\",\n      \"method\": \"Gene knockout mouse, µCT analysis, siRNA, overexpression, PKC activity assays\",\n      \"journal\": \"Journal of Steroid Biochemistry and Molecular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo KO phenotype corroborated by cellular loss/gain-of-function with defined molecular readout\",\n      \"pmids\": [\"20576531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PDIA3 co-localizes and interacts with VDR and caveolin-1 at the plasma membrane of osteoblasts; both PDIA3 and VDR interact with caveolin-1 by immunoprecipitation; PDIA3 interacts with PLAA whereas VDR interacts with c-Src; silencing either receptor or caveolin-1 inhibits both PLA2 and c-Src activation, demonstrating interdependent function of the two receptors in rapid membrane responses to 1,25(OH)2D3.\",\n      \"method\": \"Co-immunoprecipitation, confocal co-localization, siRNA silencing, kinase activity assays\",\n      \"journal\": \"Cellular Signalling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus functional silencing experiments with defined signaling readouts\",\n      \"pmids\": [\"23896121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Chaperone functional domains of PDIA3 (K214/R282 calreticulin-interaction sites and C406 isomerase catalytic site) and myristoylation are required for 1,25(OH)2D3-induced PKC activation at the plasma membrane; PDIA3 lacking the KDEL ER-retention signal shows increased plasma membrane localization but the stimulatory effect on PKC requires intact chaperone domains.\",\n      \"method\": \"Site-directed mutagenesis, overexpression of mutant constructs, PKC activity assays, subcellular fractionation\",\n      \"journal\": \"Molecular Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of catalytic and interaction domains with direct functional readout\",\n      \"pmids\": [\"23660595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"ERp57 is expressed on the platelet surface and is required for platelet aggregation, hemostasis, and thrombosis; inhibitory anti-ERp57 antibody blocks ERp57 activity, inhibits αIIbβ3 activation and P-selectin expression, prolongs bleeding time, and inhibits FeCl3-induced thrombosis in mice. Catalytically inactive ERp57 inhibits platelet aggregation.\",\n      \"method\": \"Inhibitory antibody, recombinant ERp57 addition, tail bleeding assay, in vivo thrombosis model, flow cytometry\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent antibodies and catalytically inactive mutant used in vitro and in vivo, mechanistically rigorous\",\n      \"pmids\": [\"22207737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ERp57 is required for fibrin deposition in vivo; platelet-specific (Pf4-Cre) and endothelial-specific (Tie2-Cre) conditional ERp57 knockout each reduce fibrin deposition; ERp57 isomerase activity of the second active site is required for both fibrin deposition and platelet accumulation; recombinant ERp57 corrects the fibrin deposition defect, indicating a direct effect on coagulation.\",\n      \"method\": \"Conditional knockout mice, laser-induced thrombosis intravital microscopy, inhibitory antibody, recombinant active-site mutant ERp57, in vitro thrombin generation assay\",\n      \"journal\": \"Journal of Thrombosis and Haemostasis\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple conditional KO models, active-site mutants, and in vivo rescue experiments\",\n      \"pmids\": [\"25156521\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERp57 physically interacts with the prion protein (PrP) and controls its maturation and steady-state levels; ERp57 gain- and loss-of-function in cell culture alters PrP levels; conditional nervous system ERp57 knockout reduces mono- and non-glycosylated PrP forms in brain; ERp57 transgenic mice show increased endogenous PrP levels.\",\n      \"method\": \"Co-immunoprecipitation, gain/loss-of-function cell culture, conditional knockout mouse, Western blot\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus in vivo conditional KO and transgenic corroboration\",\n      \"pmids\": [\"26170458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ERp57 oxidatively inactivates transglutaminase 2 (TG2) via the allosteric Cys370–Cys371 disulfide bond with a rate constant 400–2000-fold higher than small-molecule oxidants; ERp57 co-localizes with extracellular TG2 in endothelial cells; siRNA-mediated ERp57 knockdown increases TG2 transamidation activity extracellularly, establishing ERp57 as the physiological oxidative inactivator of TG2.\",\n      \"method\": \"In vitro enzymatic assay with rate constant measurement, siRNA knockdown, immunofluorescence co-localization, transamidation activity assay\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted in vitro kinetics with mutagenesis context plus siRNA knockdown confirmation\",\n      \"pmids\": [\"29305423\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PDIA3 directly interacts with influenza A virus hemagglutinin (HA) and is required for its efficient disulfide bond formation and oligomerization (maturation); lung epithelial-specific PDIA3 deletion reduces viral burden and lung inflammation in mice; PDI inhibitor LOC14 decreases intramolecular HA disulfide bonds and viral replication in H1N1 and H3N2 infection.\",\n      \"method\": \"Co-immunoprecipitation, conditional (epithelial-specific) PDIA3 knockout mouse, viral load quantification, PDI inhibitor treatment, Western blot for disulfide status\",\n      \"journal\": \"Redox Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction confirmed with in vivo conditional KO and pharmacological inhibitor corroborating the functional requirement\",\n      \"pmids\": [\"30735910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Vitamin D3 activates PDIA3 as a receptor at the cell surface of gastric epithelial cells, promoting nuclear translocation of a PDIA3-STAT3 protein complex and subsequent upregulation of MCOLN3 channels, leading to enhanced lysosomal Ca2+ release, restoration of lysosomal acidification, and autolysosomal clearance of Helicobacter pylori.\",\n      \"method\": \"PDIA3 CRISPR knockout and siRNA knockdown, neutralizing antibody, co-immunoprecipitation of PDIA3-STAT3, ChIP-PCR, Ca2+ imaging, CFU assays in vitro and in vivo\",\n      \"journal\": \"Autophagy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO and knockdown with multiple downstream mechanistic assays including Co-IP, ChIP, and Ca2+ measurements\",\n      \"pmids\": [\"30612517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Crystal structure (2.7 Å) of the tapasin–ERp57 heterodimer in complex with peptide-receptive MHC class I reveals atomic details of client recognition and the mechanistic basis for tapasin's selector function in peptide proofreading; ERp57 is disulfide-linked to tapasin via its redox active site and stabilizes the complex.\",\n      \"method\": \"X-ray crystallography at 2.7 Å, functional mutagenesis validation\",\n      \"journal\": \"Nature Communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional validation, defines atomic mechanism\",\n      \"pmids\": [\"36104323\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ERp57-deficient MHC class I peptide-loading complexes (using tapasin C95A mutant unable to disulfide-link ERp57) are prone to ER aggregation, demonstrating that ERp57 is required for the stability of the core loading complex.\",\n      \"method\": \"Fluorescently-tagged tapasin mutant expression, FRET analysis, confocal microscopy, cell fractionation\",\n      \"journal\": \"Traffic\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — tapasin mutant system with live-cell imaging and FRET, single lab\",\n      \"pmids\": [\"17822402\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The circadian gene Clock activates Pdia3 transcription by binding the E-box promoter element; forced expression of Pdia3 rescues osteogenic disorders and inhibits apoptosis in Clock mutant mice; siRNA ablation of PDIA3 blocks compensatory effects of Clock overexpression in osteoblasts.\",\n      \"method\": \"Luciferase reporter assay, ChIP, in vivo forced expression/knockout in ClockΔ19 mutant mice, siRNA knockdown\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP and luciferase confirm direct transcriptional regulation, with in vivo rescue experiments\",\n      \"pmids\": [\"27883226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ERp57 is a host factor required for hepatitis B virus (HBV) membrane fusion and infection; computational modeling identified an allosteric cross-strand disulfide bond in the HBV S glycoprotein, and ERp57-mediated thiol/disulfide exchange triggers its isomerization, exposing the fusion peptide in preS1.\",\n      \"method\": \"Computational modeling, experimental infection assays, ERp57 functional perturbation\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — combined computational and experimental approach establishing host factor role; single study\",\n      \"pmids\": [\"34190687\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In adipose tissue macrophages, ATF4 transcribes PDIA3, which imposes redox control on RhoA activity and strengthens pro-inflammatory and migratory properties of a maladaptive macrophage subpopulation (iMAMs) through RhoA-YAP signaling; siRNA-loaded liposomes targeting Pdia3 repress adipose inflammation and HFD-induced obesity.\",\n      \"method\": \"Single-nucleus RNA sequencing, ATF4 ChIP (inferred from transcription), PDIA3 siRNA liposome delivery in vivo, RhoA activity assays, YAP signaling readouts\",\n      \"journal\": \"Cell Metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — snRNA-seq defining subpopulation plus in vivo siRNA with defined signaling pathway; single study\",\n      \"pmids\": [\"39293433\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PDIA3 knockdown and ENO1 knockdown in primary murine alveolar epithelial type II cells reduce ATI cell marker T1α expression, indicating PDIA3 is required downstream of Wnt/β-catenin signaling for ATII-to-ATI trans-differentiation.\",\n      \"method\": \"siRNA knockdown, proteomics (mass spectrometry), immunoblotting, pharmacological Wnt inhibition\",\n      \"journal\": \"Disease Models & Mechanisms\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with defined cell-fate marker readout, corroborated by pharmacological inhibition and in vivo injury model\",\n      \"pmids\": [\"26035385\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERp57 overexpression in transgenic mice enhances locomotor recovery, myelin removal, macrophage infiltration, and axonal regeneration after sciatic nerve injury, demonstrating a functional role for ERp57 in peripheral nerve regeneration.\",\n      \"method\": \"ERp57 transgenic mouse, sciatic nerve crush model, behavioral testing, histological analysis\",\n      \"journal\": \"PLOS ONE\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic overexpression with defined functional phenotype, single lab\",\n      \"pmids\": [\"26361352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Wnt5a signals through a CaMKII/PLA2/PGE2/PKC cascade in osteoblasts that requires PDIA3, PLAA, and VDR; PDIA3 membrane complex components (Pdia3, PLAA, caveolin-1, CaM) physically interact with Wnt5a receptors/co-receptors (ROR2, FZD2, FZD5) as shown by co-immunoprecipitation, and these interactions change with ligand treatment.\",\n      \"method\": \"Co-immunoprecipitation, siRNA silencing, pharmacological inhibitors, PKC activity assays\",\n      \"journal\": \"Biochimica et Biophysica Acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP plus multiple silencing experiments showing pathway interdependence, single lab\",\n      \"pmids\": [\"24946135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Punicalagin (from pomegranate) binds purified PDIA3 with high affinity and acts as a non-competitive inhibitor of PDIA3 reductase activity in vitro; this inhibitory effect is reduced in PDIA3-silenced neuroblastoma cells, confirming PDIA3 as the relevant target.\",\n      \"method\": \"Fluorescence quenching, isothermal titration calorimetry, in vitro reductase assay, PDIA3 siRNA knockdown, cell viability assay\",\n      \"journal\": \"Biochimie\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzymatic inhibition with ITC binding confirmation and cellular target validation via knockdown\",\n      \"pmids\": [\"29425676\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ERp57 upregulation in clear cell renal carcinoma cells binds STAT3 protein and enhances STAT3-mediated transcriptional activity of ILF3; ILF3 in turn binds ERp57 mRNA to enhance its stability, creating a positive feedback loop (ERp57/STAT3/ILF3) that promotes ccRCC proliferation.\",\n      \"method\": \"Co-immunoprecipitation, proximity ligation assay, ChIP, RIP, oligo pull-down, promoter luciferase assay, in vivo xenograft\",\n      \"journal\": \"Journal of Experimental & Clinical Cancer Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple interaction assays (Co-IP, PLA, ChIP, RIP) in single lab establishing feedback mechanism\",\n      \"pmids\": [\"31747963\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PDIA3 knockdown in trophoblasts inhibits MDM2 expression and consequently elevates p53 and p21, promoting apoptosis and inhibiting proliferation; overexpression of PDIA3 reverses these effects, placing PDIA3 upstream of the MDM2/p53/p21 pathway in trophoblast biology.\",\n      \"method\": \"siRNA knockdown, PDIA3 overexpression, RNA sequencing, Western blot, flow cytometry, EdU proliferation assay\",\n      \"journal\": \"Reproduction\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal gain/loss-of-function with defined molecular pathway readout, single lab\",\n      \"pmids\": [\"32585639\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"PDIA3 inhibition in club cells of the lung attenuates osteopontin (SPP1) production and bleomycin-induced lung fibrosis; SPP1 is identified as a major PDIA3 interactor in fibrosis by proteomics; club cell-specific Pdia3 ablation decreases parenchymal club cells and fibrosis in mice.\",\n      \"method\": \"Club cell-specific PDIA3 knockout, PDI inhibitor LOC14, proteomics/interactome analysis, bleomycin mouse fibrosis model, SPP1 blocking\",\n      \"journal\": \"Thorax\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — cell-type-specific KO with defined mechanistic interactor identified by proteomics and in vivo validation\",\n      \"pmids\": [\"34400514\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"PDIA3 (ERp57/GRP58) is a multifunctional thiol-disulfide oxidoreductase of the PDI family that: (1) acts as a glycoprotein-specific foldase in the ER calnexin/calreticulin cycle; (2) forms a disulfide-linked heterodimer with tapasin within the MHC class I peptide-loading complex to stabilize it and facilitate peptide editing (structure resolved at 2.7 Å); (3) co-translocates to the cell surface with calreticulin during immunogenic cell death to elicit anti-tumor immunity; (4) functions at the plasma membrane in caveolae as a receptor for 1α,25(OH)2D3, activating PLA2/PKC/ERK signaling via PLAA and interdependently with VDR; (5) oxidatively inactivates extracellular transglutaminase 2 via the Cys370–Cys371 allosteric disulfide; (6) regulates platelet aggregation, hemostasis, and fibrin deposition through its isomerase activity; (7) participates in nuclear regulation of STAT3 target genes and DNA damage signaling (γ-H2AX); and (8) is required for influenza HA maturation and HBV membrane fusion via thiol/disulfide exchange.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"PDIA3 (ERp57/GRP58) is a thiol-disulfide oxidoreductase of the protein disulfide isomerase family that operates across multiple cellular compartments to catalyze oxidative folding, regulate redox-dependent signaling, and modulate immune recognition. In the ER, PDIA3 associates with calnexin and calreticulin via its b' domain to catalyze disulfide bond formation in glycoprotein substrates including influenza hemagglutinin and the prion protein, and forms a disulfide-linked heterodimer with tapasin that stabilizes the MHC class I peptide-loading complex and enables peptide proofreading, as resolved by a 2.7 Å crystal structure [PMID:9153243, PMID:14732712, PMID:17459881, PMID:36104323, PMID:26170458]. At the plasma membrane, PDIA3 localizes to caveolae where it functions as a 1α,25(OH)₂D₃ receptor that activates PLA2/PKC signaling interdependently with VDR, mediates platelet aggregation and fibrin deposition through its isomerase activity, oxidatively inactivates extracellular transglutaminase 2, and co-translocates with calreticulin during immunogenic cell death to promote anti-tumor immunity [PMID:20843786, PMID:23896121, PMID:22207737, PMID:25156521, PMID:29305423, PMID:18464797]. PDIA3 also participates in nuclear functions including redox-dependent DNA binding via its oxidized a' domain homodimer, regulation of STAT3 phosphorylation and STAT3-dependent transcription, and γ-H2AX-mediated DNA damage signaling [PMID:17283067, PMID:19995546, PMID:19372559].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Establishing that ERp57 is a glycoprotein-specific chaperone resolved the question of how the calnexin/calreticulin cycle recruits an oxidoreductase: ERp57 interacts selectively with N-glycosylated membrane proteins in a glucose-trimming-dependent manner.\",\n      \"evidence\": \"Co-immunoprecipitation with glycosylation inhibitor controls in mammalian cells\",\n      \"pmids\": [\"9153243\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate specificity determinants beyond glycosylation not defined\", \"No structural data on ERp57–lectin chaperone interface at this stage\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Placing ERp57 inside the MHC class I peptide-loading complex answered how antigen presentation recruits an oxidoreductase and linked ER quality control to adaptive immunity.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation and biochemical fractionation of MHC class I complexes\",\n      \"pmids\": [\"9637923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the ERp57–tapasin linkage unknown\", \"Whether ERp57 catalytic activity is required for peptide loading not tested\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Mapping DNA-binding activity to the oxidized a' domain revealed an unexpected nuclear function for an ER oxidoreductase, raising the question of how redox state toggles ERp57 between chaperone and transcriptional roles.\",\n      \"evidence\": \"Recombinant domain deletion mutagenesis with in vitro DNA-binding assays\",\n      \"pmids\": [\"12083768\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of DNA binding not established\", \"Mechanism of nuclear import undefined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defining the four-domain (abb'a') architecture and mapping the calreticulin/calnexin interaction to the b' domain provided the structural framework for understanding how ERp57 is recruited to glycoprotein substrates.\",\n      \"evidence\": \"Limited proteolysis, recombinant domain expression, chemical cross-linking, CD spectroscopy, and mass spectrometry\",\n      \"pmids\": [\"14732712\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No high-resolution structure of ERp57–calreticulin complex\", \"Catalytic efficiency relative to PDI only partially characterized\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating ERp57 within STAT3–DNA complexes on the α2-macroglobulin enhancer established that ERp57 participates directly in transcription factor–DNA assemblies, not merely in protein folding.\",\n      \"evidence\": \"EMSA, DNA affinity chromatography, and chromatin immunoprecipitation in two cell types\",\n      \"pmids\": [\"15451439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which ERp57 modulates STAT3 DNA binding unknown\", \"Whether ERp57 catalytic activity is required not tested\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"ERp57 knockout cells revealed that ERp57 is specifically required for post-translational (not co-translational) oxidative folding of influenza HA, delineating the temporal window of ERp57 action in the calnexin cycle.\",\n      \"evidence\": \"ERp57 knockout cell lines with pulse-chase folding assays for influenza HA and other substrates\",\n      \"pmids\": [\"16407314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ERp72 partial compensation complicates full loss-of-function interpretation\", \"Scope of ERp57-dependent substrates not comprehensively cataloged\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying the disulfide-linked ERp57–tapasin heterodimer and a trimeric ERp57–tapasin–MHC I heavy chain complex defined the redox chemistry at the heart of peptide loading, showing ERp57 directly engages the peptide-binding groove.\",\n      \"evidence\": \"Site-directed cysteine mutagenesis, co-immunoprecipitation, and intracellular redox manipulation\",\n      \"pmids\": [\"17459881\", \"17822402\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic structure not yet available\", \"How ERp57 cooperates with PDI in MHC I redox regulation unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing that oxidation drives ERp57 a' domain homodimerization via active-site cysteines (with C406 essential) and that thioredoxin reductase reverses it defined a redox switch controlling DNA-binding competence.\",\n      \"evidence\": \"Site-directed mutagenesis, mass spectrometry, and thioredoxin reductase reduction assay on recombinant protein\",\n      \"pmids\": [\"17283067\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological oxidant that activates the switch in vivo unknown\", \"Genome-wide DNA binding targets not mapped\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that ERp57 co-translocates with calreticulin to the cell surface during immunogenic cell death—and that their direct interaction is strictly required—established ERp57 as a gatekeeper of immunogenic signaling in cancer therapy.\",\n      \"evidence\": \"CRT point mutants abolishing ERp57 interaction, shRNA knockdown, mass spectrometry, and in vivo mouse tumor models with anthracycline treatment\",\n      \"pmids\": [\"18464797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of ER-to-surface translocation pathway undefined\", \"Whether ERp57 catalytic activity is required for surface exposure not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Placing PDIA3 upstream of γ-H2AX but not p53 phosphorylation positioned it in a distinct branch of the DNA damage response, expanding its nuclear roles beyond transcription.\",\n      \"evidence\": \"siRNA knockdown with Western blot and immunofluorescence for γ-H2AX after cytarabine treatment\",\n      \"pmids\": [\"19372559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate or kinase target of PDIA3 in H2AX phosphorylation unknown\", \"Single lab, single DNA-damaging agent tested\", \"Whether the effect is through redox modulation of ATM/ATR not addressed\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Localizing PDIA3 to caveolae and demonstrating it mediates rapid 1α,25(OH)₂D₃-induced PLA2/PKC signaling—abolished by silencing and augmented by overexpression—established PDIA3 as a membrane receptor for vitamin D₃ in bone.\",\n      \"evidence\": \"Confocal co-localization with caveolin-1, siRNA/overexpression, PKC and PGE₂ assays in osteoblasts; Pdia3 knockout mouse showing embryonic lethality and skeletal defects\",\n      \"pmids\": [\"20843786\", \"20576531\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct ligand-binding site on PDIA3 for 1,25(OH)₂D₃ not structurally defined\", \"Mechanism of PDIA3 escape from ER to plasma membrane not resolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that ERp57 isomerase activity on the platelet surface is required for αIIbβ3 activation, P-selectin expression, and in vivo hemostasis revealed an extracellular catalytic function of ERp57 in thrombosis.\",\n      \"evidence\": \"Inhibitory anti-ERp57 antibody, catalytically inactive mutant, tail bleeding assay, and FeCl₃ thrombosis model in mice\",\n      \"pmids\": [\"22207737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct disulfide substrate on αIIbβ3 not identified\", \"Mechanism of ERp57 secretion from platelets not defined\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrating that PDIA3 and VDR form an interdependent caveolar signaling complex—with PDIA3 coupling to PLAA and VDR to c-Src—resolved how two receptors cooperate in rapid membrane vitamin D₃ responses and showed that chaperone domains and myristoylation are required for signaling.\",\n      \"evidence\": \"Reciprocal co-immunoprecipitation of PDIA3/VDR/caveolin-1, siRNA silencing of each component, site-directed mutagenesis of calreticulin-interaction and catalytic residues\",\n      \"pmids\": [\"23896121\", \"23660595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PDIA3–VDR interaction not defined\", \"How myristoylation targets PDIA3 to caveolae not mechanistically resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Conditional platelet- and endothelial-specific ERp57 knockouts pinpointed the cell types and the specific active site (second CGHC motif) required for fibrin deposition, establishing ERp57 isomerase activity as a direct regulator of coagulation.\",\n      \"evidence\": \"Pf4-Cre and Tie2-Cre conditional knockouts, laser-induced thrombosis with intravital microscopy, recombinant active-site mutant rescue\",\n      \"pmids\": [\"25156521\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Coagulation factor substrate of the second active site not identified\", \"Relative contribution of platelet vs. endothelial ERp57 not fully resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Kinetic demonstration that ERp57 oxidizes the Cys370–Cys371 allosteric disulfide of transglutaminase 2 at rates 400–2000-fold faster than small molecules identified ERp57 as the physiological extracellular inactivator of TG2.\",\n      \"evidence\": \"In vitro rate constant measurements, siRNA knockdown increasing extracellular TG2 activity, immunofluorescence co-localization in endothelial cells\",\n      \"pmids\": [\"29305423\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation in TG2-dependent disease models not performed\", \"Whether other PDI family members contribute to TG2 regulation not excluded\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Lung epithelial-specific PDIA3 deletion reduced influenza viral burden, confirming PDIA3 as a host factor required for HA maturation in vivo and validating it as an antiviral target.\",\n      \"evidence\": \"Conditional epithelial-specific Pdia3 knockout mice infected with H1N1/H3N2, PDI inhibitor LOC14, co-immunoprecipitation of PDIA3–HA\",\n      \"pmids\": [\"30735910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether PDIA3 inhibition affects other respiratory viruses not tested\", \"Therapeutic window of PDI inhibitors in vivo not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linking PDIA3 to vitamin D₃-induced STAT3 nuclear translocation and MCOLN3-dependent lysosomal acidification for Helicobacter pylori clearance unified the membrane receptor and STAT3-regulatory functions of PDIA3 in a single signaling axis.\",\n      \"evidence\": \"CRISPR knockout and siRNA in gastric epithelial cells, co-immunoprecipitation of PDIA3–STAT3, ChIP-PCR for MCOLN3, Ca²⁺ imaging, bacterial CFU assays\",\n      \"pmids\": [\"30612517\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this pathway operates in other cell types beyond gastric epithelium unknown\", \"Direct ligand-binding evidence for 1,25(OH)₂D₃–PDIA3 at atomic level still lacking\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"The 2.7 Å crystal structure of the tapasin–ERp57 heterodimer with peptide-receptive MHC class I provided the atomic mechanism for peptide proofreading, showing how ERp57's disulfide linkage to tapasin stabilizes the editing complex.\",\n      \"evidence\": \"X-ray crystallography at 2.7 Å resolution with functional mutagenesis validation\",\n      \"pmids\": [\"36104323\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamic conformational changes during peptide exchange not captured by static structure\", \"Structure of the full six-component PLC (with TAP1/TAP2) not yet resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identifying PDIA3 as an ATF4-transcribed effector that imposes redox control on RhoA–YAP signaling in inflammatory adipose macrophages extended PDIA3's extracellular thiol-exchange functions to metabolic inflammation.\",\n      \"evidence\": \"Single-nucleus RNA-seq, PDIA3 siRNA-loaded liposomes in vivo reducing adipose inflammation and HFD-induced obesity, RhoA activity and YAP signaling assays\",\n      \"pmids\": [\"39293433\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct RhoA disulfide substrate of PDIA3 not biochemically confirmed\", \"Single study; independent replication pending\", \"Whether the effect is cell-autonomous to macrophages not fully resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: the structural basis of 1α,25(OH)₂D₃ binding to PDIA3 at the plasma membrane, the mechanism by which PDIA3 escapes ER retention to reach the cell surface, and the identity of the coagulation factor disulfide substrates acted upon by ERp57's second active site during thrombosis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No ligand-bound PDIA3 structure for vitamin D₃\", \"ER-to-surface trafficking pathway undefined\", \"Coagulation disulfide substrates not identified\", \"Genome-wide catalog of ERp57-dependent glycoprotein substrates incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [1, 2, 3, 4, 17, 18, 20, 21]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [2, 3, 9, 17, 18, 20, 31]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [8, 9, 10]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 13, 22, 27, 32, 33]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [13, 14, 15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 1, 2, 3, 4, 23]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 13, 15, 16, 17]},\n      {\"term_id\": \"GO:0005576\", \"supporting_discovery_ids\": [17, 18, 20]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [6, 7, 8, 9, 10, 22]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 4, 11, 23, 24]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1, 2, 3, 19, 21]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [13, 14, 15, 16, 22, 27, 30]},\n      {\"term_id\": \"R-HSA-109582\", \"supporting_discovery_ids\": [17, 18]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [11, 33]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [22]}\n    ],\n    \"complexes\": [\n      \"MHC class I peptide-loading complex\",\n      \"Calnexin/calreticulin cycle\",\n      \"PDIA3-VDR-caveolin-1 membrane complex\"\n    ],\n    \"partners\": [\n      \"CALR\",\n      \"CANX\",\n      \"TAPBP\",\n      \"STAT3\",\n      \"VDR\",\n      \"CAV1\",\n      \"PLAA\",\n      \"TGM2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}