{"gene":"TMX3","run_date":"2026-06-10T10:51:55","timeline":{"discoveries":[{"year":2004,"finding":"TMX3 is a type I transmembrane protein of the endoplasmic reticulum with a single thioredoxin-like domain containing a CGHC active site, an N-terminal signal sequence, a transmembrane domain, and a C-terminal KKKD ER-retrieval sequence. It localizes to the ER membrane (confirmed by immunofluorescence and alkaline extraction), contains EndoH-sensitive glycans, and exhibits oxidase activity in vitro. Its recombinant luminal domain has a redox potential of -0.157 V, similar to PDI and ERp57, and is partially oxidized in human cells.","method":"Immunofluorescence microscopy, alkaline extraction/membrane fractionation, circular dichroism spectroscopy, redox potential determination (in vitro), in vitro oxidase activity assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (localization, biochemical fractionation, in vitro enzymatic assay, redox potential measurement) in a single focused study on TMX3","pmids":["15623505"],"is_preprint":false},{"year":2007,"finding":"The ER-luminal region of TMX3 contains three thioredoxin-like domains: one N-terminal redox-active domain (a) with a CGHC active site and two enzymatically inactive domains (b and b'). The isolated reduced a domain is folded but is greatly destabilized upon oxidation. The adjacent b domain stabilizes the a domain against chemical denaturation and proteolysis in both oxidized and reduced forms, demonstrating that redox-inactive thioredoxin-like domains can function in stabilizing neighboring redox-active domains.","method":"Recombinant domain expression (a, ab, abb' constructs), NMR/biophysical methods, chemical denaturation assays, limited proteolysis, molecular modeling","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods (NMR, proteolysis, denaturation) on recombinant constructs in a single focused study","pmids":["17881353"],"is_preprint":false},{"year":2010,"finding":"Mixed-disulfide complexes of Ero1α do not form detectably with TMX3 (unlike PDI, ERp57, and ERp72), indicating TMX3 is not a substrate of the Ero1α oxidase pathway for ER disulfide generation.","method":"Mixed-disulfide trapping, co-immunoprecipitation, experiments in ERO1-deficient cells","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal trapping assay with negative result for TMX3, replicated across cell conditions including ERO1-deficient cells; negative finding is mechanistically informative","pmids":["20802462"],"is_preprint":false},{"year":2010,"finding":"TMX3 is required for normal eye development in zebrafish: morpholino knockdown of the TMX3 orthologue produced significantly smaller eyes and reduced islet-1 labeling of retinal ganglion cells. Co-injection of wild-type human TMX3 mRNA rescued the small-eye phenotype, but the p.Arg39Gln missense mutant (found in a microphthalmia patient) did not rescue, establishing that the redox-active domain function is necessary for TMX3's role in eye morphogenesis.","method":"Zebrafish antisense morpholino knockdown, mRNA rescue experiments (wild-type vs. patient mutant TMX3), islet-1 immunolabeling","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function with defined cellular phenotype, rescue by wild-type but not mutant human mRNA, two independent morpholinos","pmids":["20485507"],"is_preprint":false},{"year":2009,"finding":"TMX3 is present on the surface of resting platelets and does not increase in surface expression following platelet activation, unlike other thiol isomerases (ERp72, ERp57, ERp44, ERp29) that are released and relocate to the surface upon activation.","method":"Immunoblotting, flow cytometry, cell-surface biotinylation, gene array analysis","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — multiple orthogonal detection methods (flow cytometry, biotinylation, immunoblot) in platelets and megakaryocytes; localization finding with some functional context","pmids":["19995400"],"is_preprint":false},{"year":2019,"finding":"TMX3 (together with TMX1) promotes ER-mitochondria communication. Knockdown of TMX3 altered mitochondrial organization, enhanced mitochondrial bioenergetics, and elevated mitochondrial- and NOX4-derived ROS. TMX3 knockdown-induced oxidative stress suppressed melanoma proliferation, migration, and xenograft tumor growth by inhibiting NFAT1 transcription factor activity.","method":"siRNA knockdown, mitochondrial morphology imaging, bioenergetics assays, ROS measurement, xenograft tumor growth assay, NFAT1 reporter assays","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple defined cellular phenotypes (morphology, bioenergetics, ROS, proliferation, migration, tumor growth) in a single lab study","pmids":["31304984"],"is_preprint":false},{"year":2020,"finding":"TMX3 functions as an essential cofactor enabling robust functional expression of insect nicotinic acetylcholine receptor (nAChR) heteromers (from honeybee, bumblebee, and fruit fly) in Xenopus laevis oocytes, a role not previously described for any PDI family member in ion channel assembly.","method":"Heterologous expression in Xenopus laevis oocytes, two-electrode voltage-clamp electrophysiology","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct functional reconstitution in oocyte expression system, replicated across multiple insect nAChR subtypes and species","pmids":["32611810"],"is_preprint":false},{"year":2015,"finding":"Overexpression of TMX3 (and TRX1) in a lentiviral mouse model of Huntington's disease decreased soluble mutant huntingtin (mHTT) levels in cultured cells and reduced mHTT-induced striatal neuronal atrophy in vivo, implicating TMX3's thiol-disulfide oxidoreductase activity in protein-thiol homeostasis relevant to mHTT clearance.","method":"In vitro genetic screen of oxidoreductases, lentiviral overexpression in mouse striatum, mHTT aggregate/soluble level quantification, neuronal atrophy measurement","journal":"PLoS currents","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro screen plus in vivo lentiviral model with defined phenotypic readout (neuronal atrophy), single lab","pmids":["26664998"],"is_preprint":false},{"year":2024,"finding":"TMX3 was identified as a binding partner of MT5-MMP (membrane-type 5 matrix metalloproteinase) via yeast two-hybrid screen of a human brain cDNA library, and TMX3 binding to MT5-MMP resulted in a significant increase in MT5-MMP η-secretase activity (sAPPη production), suggesting TMX3 facilitates MT5-MMP processing of amyloid precursor protein.","method":"Yeast two-hybrid screen, sAPPη production assay (functional readout)","journal":"Journal of cellular physiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — yeast two-hybrid interaction plus single functional readout, no direct binding confirmation (co-IP/pulldown) reported in abstract","pmids":["38345408"],"is_preprint":false},{"year":2025,"finding":"TMX3 is secreted by vascular endothelial cells and detected as an oxidized extracellular protein on the cell surface following diamide treatment, providing the first evidence of TMX3 secretion in endothelial cells.","method":"Plasma membrane-impermeable thiol labeling, mass spectrometry-based redox proteomics","journal":"Journal of proteomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single proteomics method, no functional follow-up reported in abstract","pmids":["40712755"],"is_preprint":false}],"current_model":"TMX3 is an ER-resident type I transmembrane oxidoreductase of the PDI family with a thioredoxin-like CGHC active site and a three-domain luminal architecture (one redox-active 'a' domain stabilized by two inactive 'b/b'' domains); it exhibits oxidase activity in vitro (redox potential ~−0.157 V), localizes to the ER membrane via a C-terminal KKXX retrieval signal, is not a substrate of Ero1α, is required for normal eye development in zebrafish (with the active-site domain essential for rescue), promotes ER-mitochondria communication and regulates mitochondrial ROS/NFAT1 signaling in melanoma cells, is present constitutively on the platelet surface, and uniquely functions as an essential cofactor for functional heterologous expression of insect nicotinic acetylcholine receptors."},"narrative":{"mechanistic_narrative":"TMX3 is an endoplasmic reticulum-resident type I transmembrane thiol-disulfide oxidoreductase of the PDI family that participates in oxidative protein folding and redox-dependent cellular processes [PMID:15623505]. Its ER-luminal region adopts a three thioredoxin-like domain architecture in which a single N-terminal redox-active 'a' domain carries the CGHC active site while the catalytically inactive 'b' domain stabilizes the redox-active domain against denaturation and proteolysis in both oxidation states [PMID:17881353]; the luminal domain exhibits oxidase activity in vitro with a redox potential of −0.157 V, comparable to PDI and ERp57, and is anchored to the ER membrane via a C-terminal KKXX-type retrieval signal [PMID:15623505]. TMX3 is not engaged by the Ero1α oxidase pathway that re-oxidizes other PDI-family members, distinguishing its route of catalytic-cysteine reoxidation [PMID:20802462]. Functionally, its redox-active domain is required for vertebrate eye morphogenesis, since wild-type but not a patient-derived active-site-region missense mutant rescues the microphthalmia-like phenotype of TMX3 knockdown in zebrafish [PMID:20485507]. TMX3 also promotes ER-mitochondria communication and constrains mitochondrial and NOX4-derived ROS to sustain NFAT1-driven melanoma proliferation and tumor growth [PMID:31304984], and it acts as an essential cofactor enabling functional heterologous assembly of insect nicotinic acetylcholine receptor heteromers [PMID:32611810].","teleology":[{"year":2004,"claim":"Established TMX3 as a new ER membrane-anchored PDI-family oxidoreductase, answering what kind of enzyme it is and where it acts.","evidence":"Immunofluorescence, membrane fractionation, CD spectroscopy, in vitro oxidase and redox-potential assays on the recombinant luminal domain","pmids":["15623505"],"confidence":"High","gaps":["In vivo physiological substrates not identified","Mechanism of catalytic-cysteine reoxidation unaddressed"]},{"year":2007,"claim":"Resolved the luminal domain organization, showing how a redox-inactive thioredoxin-like domain stabilizes the adjacent redox-active domain.","evidence":"Recombinant a/ab/abb' constructs analyzed by NMR/biophysics, chemical denaturation, limited proteolysis, and modeling","pmids":["17881353"],"confidence":"High","gaps":["Role of the b' domain not defined","Structural consequences for substrate binding not shown"]},{"year":2010,"claim":"Determined that TMX3 is not re-oxidized by Ero1α, distinguishing its redox cycling from canonical PDI enzymes.","evidence":"Mixed-disulfide trapping and co-IP in normal and ERO1-deficient cells (negative result for TMX3)","pmids":["20802462"],"confidence":"Medium","gaps":["The actual oxidant/reductant partner of TMX3 remains unidentified","Negative result does not exclude indirect/low-affinity coupling"]},{"year":2010,"claim":"Linked TMX3 redox-active function to a developmental phenotype, showing its catalytic domain is required for eye morphogenesis.","evidence":"Zebrafish morpholino knockdown with wild-type vs. patient missense human mRNA rescue and islet-1 retinal labeling","pmids":["20485507"],"confidence":"High","gaps":["Substrates relevant to eye development unknown","Causal role of the human variant in disease not established by family genetics here"]},{"year":2009,"claim":"Defined TMX3 surface behavior in platelets, distinguishing it from activation-mobilized thiol isomerases.","evidence":"Flow cytometry, cell-surface biotinylation, immunoblot, and gene array in platelets/megakaryocytes","pmids":["19995400"],"confidence":"Medium","gaps":["Functional role of surface TMX3 on platelets undefined","Mechanism of surface presentation despite ER-retrieval signal unexplained"]},{"year":2015,"claim":"Implicated TMX3 oxidoreductase activity in protein-thiol homeostasis relevant to mutant huntingtin clearance.","evidence":"In vitro oxidoreductase screen plus lentiviral striatal overexpression in a mouse HD model with mHTT and atrophy readouts","pmids":["26664998"],"confidence":"Medium","gaps":["Direct TMX3-mHTT interaction not shown","Mechanism of soluble mHTT reduction unresolved"]},{"year":2019,"claim":"Connected TMX3 to inter-organelle signaling, showing it promotes ER-mitochondria communication and restrains ROS to support NFAT1-dependent melanoma growth.","evidence":"siRNA knockdown with mitochondrial morphology/bioenergetics, ROS measurement, NFAT1 reporters, and xenografts","pmids":["31304984"],"confidence":"Medium","gaps":["Molecular substrate at ER-mitochondria contacts unidentified","Single-lab finding without orthogonal genetic confirmation"]},{"year":2020,"claim":"Revealed a novel chaperone-like role, with TMX3 acting as an essential cofactor for functional assembly of insect nAChR heteromers.","evidence":"Heterologous expression in Xenopus oocytes with two-electrode voltage-clamp across multiple insect receptor subtypes","pmids":["32611810"],"confidence":"High","gaps":["Whether redox activity is required for this assembly role not dissected","Relevance to mammalian receptor folding unknown"]},{"year":2024,"claim":"Identified a candidate substrate-modulating interaction, TMX3 binding MT5-MMP and enhancing its η-secretase activity.","evidence":"Yeast two-hybrid screen of brain cDNA plus sAPPη production readout","pmids":["38345408"],"confidence":"Low","gaps":["No co-IP/pulldown confirmation of direct binding","Physiological relevance to APP processing untested"]},{"year":2025,"claim":"Reported extracellular/secreted TMX3 in endothelial cells, extending its detected localization beyond the ER.","evidence":"Impermeable thiol labeling and mass spectrometry-based redox proteomics after diamide treatment","pmids":["40712755"],"confidence":"Low","gaps":["Single proteomics method without functional follow-up","Mechanism of secretion despite ER-retrieval signal unexplained"]},{"year":null,"claim":"The physiological substrates of TMX3 and the in vivo redox partner that reoxidizes its CGHC active site remain unidentified across all reported contexts.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined endogenous protein substrate","Reoxidation pathway unknown (not Ero1α)","Link between redox chemistry and the eye, melanoma, and nAChR phenotypes not mechanistically unified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[6]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[4]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1]}],"complexes":[],"partners":["TMX1","MT5-MMP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96JJ7","full_name":"Protein disulfide-isomerase TMX3","aliases":["Thioredoxin domain-containing protein 10","Thioredoxin-related transmembrane protein 3"],"length_aa":454,"mass_kda":51.9,"function":"Probable disulfide isomerase, which participates in the folding of proteins containing disulfide bonds. May act as a dithiol oxidase (PubMed:15623505). Acts as a regulator of endoplasmic reticulum-mitochondria contact sites via its ability to regulate redox signals (PubMed:31304984)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q96JJ7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TMX3","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"BCAP31","stoichiometry":0.2},{"gene":"CANX","stoichiometry":0.2},{"gene":"RER1","stoichiometry":0.2},{"gene":"SEC61B","stoichiometry":0.2},{"gene":"TMED10","stoichiometry":0.2},{"gene":"CCDC47","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TMX3","total_profiled":1310},"omim":[{"mim_id":"616102","title":"THIOREDOXIN-RELATED TRANSMEMBRANE PROTEIN 3; TMX3","url":"https://www.omim.org/entry/616102"},{"mim_id":"615437","title":"ENDOPLASMIC RETICULUM OXIDOREDUCTIN 1-LIKE, BETA; ERO1LB","url":"https://www.omim.org/entry/615437"},{"mim_id":"610436","title":"ROTATIN; RTTN","url":"https://www.omim.org/entry/610436"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TMX3"},"hgnc":{"alias_symbol":["FLJ20793","KIAA1830","PDIA13"],"prev_symbol":["TXNDC10"]},"alphafold":{"accession":"Q96JJ7","domains":[{"cath_id":"3.40.30.10","chopping":"24-115","consensus_level":"medium","plddt":93.7521,"start":24,"end":115},{"cath_id":"3.40.30.10","chopping":"134-226","consensus_level":"high","plddt":95.4043,"start":134,"end":226},{"cath_id":"3.40.30.10","chopping":"230-350","consensus_level":"high","plddt":91.3692,"start":230,"end":350}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JJ7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JJ7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JJ7-F1-predicted_aligned_error_v6.png","plddt_mean":85.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TMX3","jax_strain_url":"https://www.jax.org/strain/search?query=TMX3"},"sequence":{"accession":"Q96JJ7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96JJ7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96JJ7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JJ7"}},"corpus_meta":[{"pmid":"20802462","id":"PMC_20802462","title":"Disulphide production by Ero1α-PDI relay is rapid and effectively regulated.","date":"2010","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/20802462","citation_count":119,"is_preprint":false},{"pmid":"19995400","id":"PMC_19995400","title":"Platelets release novel thiol isomerase enzymes which are recruited to the cell surface following activation.","date":"2009","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/19995400","citation_count":86,"is_preprint":false},{"pmid":"32611810","id":"PMC_32611810","title":"Cofactor-enabled functional expression of fruit fly, honeybee, and bumblebee nicotinic receptors reveals picomolar neonicotinoid actions.","date":"2020","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/32611810","citation_count":81,"is_preprint":false},{"pmid":"15623505","id":"PMC_15623505","title":"Identification and characterization of a novel thioredoxin-related transmembrane protein of the endoplasmic reticulum.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15623505","citation_count":72,"is_preprint":false},{"pmid":"31304984","id":"PMC_31304984","title":"Redox signals at the ER-mitochondria interface control melanoma progression.","date":"2019","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/31304984","citation_count":70,"is_preprint":false},{"pmid":"26467859","id":"PMC_26467859","title":"Extracellular Thiol Isomerases and Their Role in Thrombus Formation.","date":"2015","source":"Antioxidants & redox signaling","url":"https://pubmed.ncbi.nlm.nih.gov/26467859","citation_count":61,"is_preprint":false},{"pmid":"32878123","id":"PMC_32878123","title":"Thioredoxin-Related Transmembrane Proteins: TMX1 and Little Brothers TMX2, TMX3, TMX4 and TMX5.","date":"2020","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/32878123","citation_count":39,"is_preprint":false},{"pmid":"20485507","id":"PMC_20485507","title":"A male with unilateral microphthalmia reveals a role for TMX3 in eye development.","date":"2010","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/20485507","citation_count":33,"is_preprint":false},{"pmid":"20358601","id":"PMC_20358601","title":"A maternally inherited chromosome 18q22.1 deletion in a male with late-presenting diaphragmatic hernia and microphthalmia-evaluation of DSEL as a candidate gene for the diaphragmatic defect.","date":"2010","source":"American journal of medical genetics. 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\"TMX3 is a type I transmembrane protein of the endoplasmic reticulum with a single thioredoxin-like domain containing a CGHC active site, an N-terminal signal sequence, a transmembrane domain, and a C-terminal KKKD ER-retrieval sequence. It localizes to the ER membrane (confirmed by immunofluorescence and alkaline extraction), contains EndoH-sensitive glycans, and exhibits oxidase activity in vitro. Its recombinant luminal domain has a redox potential of -0.157 V, similar to PDI and ERp57, and is partially oxidized in human cells.\",\n      \"method\": \"Immunofluorescence microscopy, alkaline extraction/membrane fractionation, circular dichroism spectroscopy, redox potential determination (in vitro), in vitro oxidase activity assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (localization, biochemical fractionation, in vitro enzymatic assay, redox potential measurement) in a single focused study on TMX3\",\n      \"pmids\": [\"15623505\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The ER-luminal region of TMX3 contains three thioredoxin-like domains: one N-terminal redox-active domain (a) with a CGHC active site and two enzymatically inactive domains (b and b'). The isolated reduced a domain is folded but is greatly destabilized upon oxidation. The adjacent b domain stabilizes the a domain against chemical denaturation and proteolysis in both oxidized and reduced forms, demonstrating that redox-inactive thioredoxin-like domains can function in stabilizing neighboring redox-active domains.\",\n      \"method\": \"Recombinant domain expression (a, ab, abb' constructs), NMR/biophysical methods, chemical denaturation assays, limited proteolysis, molecular modeling\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods (NMR, proteolysis, denaturation) on recombinant constructs in a single focused study\",\n      \"pmids\": [\"17881353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Mixed-disulfide complexes of Ero1α do not form detectably with TMX3 (unlike PDI, ERp57, and ERp72), indicating TMX3 is not a substrate of the Ero1α oxidase pathway for ER disulfide generation.\",\n      \"method\": \"Mixed-disulfide trapping, co-immunoprecipitation, experiments in ERO1-deficient cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal trapping assay with negative result for TMX3, replicated across cell conditions including ERO1-deficient cells; negative finding is mechanistically informative\",\n      \"pmids\": [\"20802462\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TMX3 is required for normal eye development in zebrafish: morpholino knockdown of the TMX3 orthologue produced significantly smaller eyes and reduced islet-1 labeling of retinal ganglion cells. Co-injection of wild-type human TMX3 mRNA rescued the small-eye phenotype, but the p.Arg39Gln missense mutant (found in a microphthalmia patient) did not rescue, establishing that the redox-active domain function is necessary for TMX3's role in eye morphogenesis.\",\n      \"method\": \"Zebrafish antisense morpholino knockdown, mRNA rescue experiments (wild-type vs. patient mutant TMX3), islet-1 immunolabeling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function with defined cellular phenotype, rescue by wild-type but not mutant human mRNA, two independent morpholinos\",\n      \"pmids\": [\"20485507\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TMX3 is present on the surface of resting platelets and does not increase in surface expression following platelet activation, unlike other thiol isomerases (ERp72, ERp57, ERp44, ERp29) that are released and relocate to the surface upon activation.\",\n      \"method\": \"Immunoblotting, flow cytometry, cell-surface biotinylation, gene array analysis\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — multiple orthogonal detection methods (flow cytometry, biotinylation, immunoblot) in platelets and megakaryocytes; localization finding with some functional context\",\n      \"pmids\": [\"19995400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TMX3 (together with TMX1) promotes ER-mitochondria communication. Knockdown of TMX3 altered mitochondrial organization, enhanced mitochondrial bioenergetics, and elevated mitochondrial- and NOX4-derived ROS. TMX3 knockdown-induced oxidative stress suppressed melanoma proliferation, migration, and xenograft tumor growth by inhibiting NFAT1 transcription factor activity.\",\n      \"method\": \"siRNA knockdown, mitochondrial morphology imaging, bioenergetics assays, ROS measurement, xenograft tumor growth assay, NFAT1 reporter assays\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple defined cellular phenotypes (morphology, bioenergetics, ROS, proliferation, migration, tumor growth) in a single lab study\",\n      \"pmids\": [\"31304984\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"TMX3 functions as an essential cofactor enabling robust functional expression of insect nicotinic acetylcholine receptor (nAChR) heteromers (from honeybee, bumblebee, and fruit fly) in Xenopus laevis oocytes, a role not previously described for any PDI family member in ion channel assembly.\",\n      \"method\": \"Heterologous expression in Xenopus laevis oocytes, two-electrode voltage-clamp electrophysiology\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct functional reconstitution in oocyte expression system, replicated across multiple insect nAChR subtypes and species\",\n      \"pmids\": [\"32611810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Overexpression of TMX3 (and TRX1) in a lentiviral mouse model of Huntington's disease decreased soluble mutant huntingtin (mHTT) levels in cultured cells and reduced mHTT-induced striatal neuronal atrophy in vivo, implicating TMX3's thiol-disulfide oxidoreductase activity in protein-thiol homeostasis relevant to mHTT clearance.\",\n      \"method\": \"In vitro genetic screen of oxidoreductases, lentiviral overexpression in mouse striatum, mHTT aggregate/soluble level quantification, neuronal atrophy measurement\",\n      \"journal\": \"PLoS currents\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro screen plus in vivo lentiviral model with defined phenotypic readout (neuronal atrophy), single lab\",\n      \"pmids\": [\"26664998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TMX3 was identified as a binding partner of MT5-MMP (membrane-type 5 matrix metalloproteinase) via yeast two-hybrid screen of a human brain cDNA library, and TMX3 binding to MT5-MMP resulted in a significant increase in MT5-MMP η-secretase activity (sAPPη production), suggesting TMX3 facilitates MT5-MMP processing of amyloid precursor protein.\",\n      \"method\": \"Yeast two-hybrid screen, sAPPη production assay (functional readout)\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — yeast two-hybrid interaction plus single functional readout, no direct binding confirmation (co-IP/pulldown) reported in abstract\",\n      \"pmids\": [\"38345408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TMX3 is secreted by vascular endothelial cells and detected as an oxidized extracellular protein on the cell surface following diamide treatment, providing the first evidence of TMX3 secretion in endothelial cells.\",\n      \"method\": \"Plasma membrane-impermeable thiol labeling, mass spectrometry-based redox proteomics\",\n      \"journal\": \"Journal of proteomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single proteomics method, no functional follow-up reported in abstract\",\n      \"pmids\": [\"40712755\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TMX3 is an ER-resident type I transmembrane oxidoreductase of the PDI family with a thioredoxin-like CGHC active site and a three-domain luminal architecture (one redox-active 'a' domain stabilized by two inactive 'b/b'' domains); it exhibits oxidase activity in vitro (redox potential ~−0.157 V), localizes to the ER membrane via a C-terminal KKXX retrieval signal, is not a substrate of Ero1α, is required for normal eye development in zebrafish (with the active-site domain essential for rescue), promotes ER-mitochondria communication and regulates mitochondrial ROS/NFAT1 signaling in melanoma cells, is present constitutively on the platelet surface, and uniquely functions as an essential cofactor for functional heterologous expression of insect nicotinic acetylcholine receptors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TMX3 is an endoplasmic reticulum-resident type I transmembrane thiol-disulfide oxidoreductase of the PDI family that participates in oxidative protein folding and redox-dependent cellular processes [#0]. Its ER-luminal region adopts a three thioredoxin-like domain architecture in which a single N-terminal redox-active 'a' domain carries the CGHC active site while the catalytically inactive 'b' domain stabilizes the redox-active domain against denaturation and proteolysis in both oxidation states [#1]; the luminal domain exhibits oxidase activity in vitro with a redox potential of \\u22120.157 V, comparable to PDI and ERp57, and is anchored to the ER membrane via a C-terminal KKXX-type retrieval signal [#0]. TMX3 is not engaged by the Ero1\\u03b1 oxidase pathway that re-oxidizes other PDI-family members, distinguishing its route of catalytic-cysteine reoxidation [#2]. Functionally, its redox-active domain is required for vertebrate eye morphogenesis, since wild-type but not a patient-derived active-site-region missense mutant rescues the microphthalmia-like phenotype of TMX3 knockdown in zebrafish [#3]. TMX3 also promotes ER-mitochondria communication and constrains mitochondrial and NOX4-derived ROS to sustain NFAT1-driven melanoma proliferation and tumor growth [#5], and it acts as an essential cofactor enabling functional heterologous assembly of insect nicotinic acetylcholine receptor heteromers [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established TMX3 as a new ER membrane-anchored PDI-family oxidoreductase, answering what kind of enzyme it is and where it acts.\",\n      \"evidence\": \"Immunofluorescence, membrane fractionation, CD spectroscopy, in vitro oxidase and redox-potential assays on the recombinant luminal domain\",\n      \"pmids\": [\"15623505\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo physiological substrates not identified\", \"Mechanism of catalytic-cysteine reoxidation unaddressed\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the luminal domain organization, showing how a redox-inactive thioredoxin-like domain stabilizes the adjacent redox-active domain.\",\n      \"evidence\": \"Recombinant a/ab/abb' constructs analyzed by NMR/biophysics, chemical denaturation, limited proteolysis, and modeling\",\n      \"pmids\": [\"17881353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of the b' domain not defined\", \"Structural consequences for substrate binding not shown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Determined that TMX3 is not re-oxidized by Ero1\\u03b1, distinguishing its redox cycling from canonical PDI enzymes.\",\n      \"evidence\": \"Mixed-disulfide trapping and co-IP in normal and ERO1-deficient cells (negative result for TMX3)\",\n      \"pmids\": [\"20802462\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The actual oxidant/reductant partner of TMX3 remains unidentified\", \"Negative result does not exclude indirect/low-affinity coupling\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked TMX3 redox-active function to a developmental phenotype, showing its catalytic domain is required for eye morphogenesis.\",\n      \"evidence\": \"Zebrafish morpholino knockdown with wild-type vs. patient missense human mRNA rescue and islet-1 retinal labeling\",\n      \"pmids\": [\"20485507\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrates relevant to eye development unknown\", \"Causal role of the human variant in disease not established by family genetics here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined TMX3 surface behavior in platelets, distinguishing it from activation-mobilized thiol isomerases.\",\n      \"evidence\": \"Flow cytometry, cell-surface biotinylation, immunoblot, and gene array in platelets/megakaryocytes\",\n      \"pmids\": [\"19995400\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of surface TMX3 on platelets undefined\", \"Mechanism of surface presentation despite ER-retrieval signal unexplained\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Implicated TMX3 oxidoreductase activity in protein-thiol homeostasis relevant to mutant huntingtin clearance.\",\n      \"evidence\": \"In vitro oxidoreductase screen plus lentiviral striatal overexpression in a mouse HD model with mHTT and atrophy readouts\",\n      \"pmids\": [\"26664998\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct TMX3-mHTT interaction not shown\", \"Mechanism of soluble mHTT reduction unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Connected TMX3 to inter-organelle signaling, showing it promotes ER-mitochondria communication and restrains ROS to support NFAT1-dependent melanoma growth.\",\n      \"evidence\": \"siRNA knockdown with mitochondrial morphology/bioenergetics, ROS measurement, NFAT1 reporters, and xenografts\",\n      \"pmids\": [\"31304984\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular substrate at ER-mitochondria contacts unidentified\", \"Single-lab finding without orthogonal genetic confirmation\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Revealed a novel chaperone-like role, with TMX3 acting as an essential cofactor for functional assembly of insect nAChR heteromers.\",\n      \"evidence\": \"Heterologous expression in Xenopus oocytes with two-electrode voltage-clamp across multiple insect receptor subtypes\",\n      \"pmids\": [\"32611810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether redox activity is required for this assembly role not dissected\", \"Relevance to mammalian receptor folding unknown\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a candidate substrate-modulating interaction, TMX3 binding MT5-MMP and enhancing its \\u03b7-secretase activity.\",\n      \"evidence\": \"Yeast two-hybrid screen of brain cDNA plus sAPP\\u03b7 production readout\",\n      \"pmids\": [\"38345408\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No co-IP/pulldown confirmation of direct binding\", \"Physiological relevance to APP processing untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Reported extracellular/secreted TMX3 in endothelial cells, extending its detected localization beyond the ER.\",\n      \"evidence\": \"Impermeable thiol labeling and mass spectrometry-based redox proteomics after diamide treatment\",\n      \"pmids\": [\"40712755\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single proteomics method without functional follow-up\", \"Mechanism of secretion despite ER-retrieval signal unexplained\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The physiological substrates of TMX3 and the in vivo redox partner that reoxidizes its CGHC active site remain unidentified across all reported contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined endogenous protein substrate\", \"Reoxidation pathway unknown (not Ero1\\u03b1)\", \"Link between redox chemistry and the eye, melanoma, and nAChR phenotypes not mechanistically unified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"TMX1\", \"MT5-MMP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}