{"gene":"DNAJA3","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1999,"finding":"TID1 encodes two alternatively spliced mitochondrial matrix proteins, hTid-1(L) and hTid-1(S), both of which co-immunoprecipitate with mitochondrial Hsp70. They have opposing effects on apoptosis: hTid-1(L) promotes apoptosis induced by mitomycin C and TNFα in a J-domain-dependent manner, while hTid-1(S) suppresses apoptosis. A J-domain mutant of hTid-1(L) dominantly suppresses apoptosis, and a J-domain mutant of hTid-1(S) increases apoptosis.","method":"Co-immunoprecipitation, overexpression of wild-type and J-domain mutant constructs, apoptosis assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP confirming Hsp70 interaction, domain mutagenesis establishing J-domain requirement, multiple orthogonal functional assays, replicated across isoforms","pmids":["10411904"],"is_preprint":false},{"year":1998,"finding":"hTid-1 interacts with the HPV-16 E7 oncoprotein via E7's carboxyl-terminal cysteine-rich metal-binding domain, as determined by yeast two-hybrid screening and complex formation assays.","method":"Yeast two-hybrid screen, in vitro complex formation","journal":"Virology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus domain-mapping, single lab, no reciprocal Co-IP from mammalian cells","pmids":["9683573"],"is_preprint":false},{"year":2001,"finding":"hTid-1 interacts with Jak2 (confirmed by co-immunoprecipitation from COS-1 cells and with endogenous proteins in HEp2 cells) and with the IFN-γ receptor subunit IFN-γR2. hTid-1 binds preferentially to active Jak2 kinase domain and both hTid-1 isoforms and Jak2 interact with Hsp70/Hsc70 in vivo; this interaction is reduced after IFN-γ treatment. Both hTid-1(S) and hTid-1(L) modulate IFN-γ-mediated transcriptional activity.","method":"Yeast two-hybrid, co-immunoprecipitation (including endogenous proteins), chimeric kinase domain constructs, transcriptional reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with endogenous proteins, multiple interaction partners confirmed, functional transcription assay, single lab but multiple orthogonal methods","pmids":["11679576"],"is_preprint":false},{"year":2001,"finding":"HTLV-1 Tax interacts with hTid-1 via the central cysteine-rich domain of hTid-1, while hTid-1's J domain mediates its binding to Hsp70. Tax associates with the hTid-1/Hsp70 molecular chaperone complex and alters cellular localization of hTid-1 and Hsp70, sequestering them from perinuclear mitochondrial clusters to a cytoplasmic 'hot spot' structure. hTid-1 expression inhibits the transformation phenotype of lung adenocarcinoma cells.","method":"Co-immunoprecipitation, domain-mapping, confocal microscopy for subcellular localization, transformation assays","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, direct localization imaging with functional consequence, single lab","pmids":["11719219"],"is_preprint":false},{"year":2002,"finding":"hTid-1 represses NF-κB activity induced by Tax, TNFα, and Bcl10 by suppressing IKKβ-mediated serine phosphorylation of IκBα, requiring a functional J domain. This interaction prolongs the half-life of IκBα and IκBβ. hTid-1 does not affect activity of p38, ERK2, or JNK1.","method":"Co-immunoprecipitation, kinase assays, NF-κB reporter assays, J-domain mutant constructs, IκBα stability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — kinase activity assays, domain mutagenesis, multiple functional readouts, multiple orthogonal methods in single lab","pmids":["11927590"],"is_preprint":false},{"year":2002,"finding":"hTid-1 interacts with the HSV-1 origin-binding protein UL9 (confirmed by in vitro immunoprecipitation), enhances UL9 binding to the HSV-1 origin oriS, and facilitates multimerization of dimeric UL9 protein, as shown by EMSA. hTid-1 has no effect on UL9's DNA-dependent ATPase or helicase activities.","method":"In vitro co-immunoprecipitation, electrophoretic mobility shift assay (EMSA), ATPase and helicase activity assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pull-down confirmed by EMSA, functional biochemical assays, single lab","pmids":["11854491"],"is_preprint":false},{"year":2004,"finding":"Tid1 interacts with the cytoplasmic domain of ErbB-2/HER-2. Increased expression of Tid1 in ErbB-2-overexpressing mammary carcinoma cells suppresses ErbB-2 expression levels and attenuates ErbB-2-dependent ERK1/2 and BMK1 signaling, leading to programmed cell death. A functional DnaJ domain is required for this suppression of ErbB-2 expression and signaling.","method":"Co-immunoprecipitation, overexpression, DnaJ domain mutant constructs, Western blotting for signaling pathway components, tumor progression assays in animals","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, domain mutagenesis, in vivo tumor model, multiple readouts, single lab","pmids":["15520177"],"is_preprint":false},{"year":2004,"finding":"Embryonic lethality occurs between E4.5 and E7.5 in Tid1-null mice. In mouse embryonic fibroblasts, Tid1 removal causes massive cell death that is rescued by wild-type Tid1 but not by a J-domain mutant incapable of binding Hsp70, establishing that Tid1's essential role in cell survival requires its interaction with Hsp70.","method":"Conditional knockout mouse model, cell death assays, rescue with wild-type vs. J-domain mutant constructs","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic KO with embryonic lethality, cell death rescue assays with domain mutant, multiple genetic tools in single rigorous study","pmids":["14993262"],"is_preprint":false},{"year":2005,"finding":"hTid-1 strongly associates with the cytoplasmic NF-κB-IκB complex through direct interactions with IκBα/β and the IKKα/β subunits of the IKK complex, suppressing IKK activity in a J-domain-dependent manner and causing cytoplasmic retention and enhanced stability of IκB proteins.","method":"Co-immunoprecipitation, direct binding assays, IKK activity assays, J-domain deletion mutant, NF-κB reporter assays, tumor growth in nude mice","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — direct binding, kinase activity assays, domain mutagenesis, in vivo tumor model, multiple orthogonal methods","pmids":["15601829"],"is_preprint":false},{"year":2005,"finding":"Tid1 depletion in MDA-MB231 breast cancer cells enhances migration and IL-8 secretion (~3.5-fold). The enhanced migration is blocked by reducing IL-8 expression or adding an IL-8 neutralizing antibody. The IL-8 promoter NF-κB binding site is required for Tid1 depletion-induced IL-8 upregulation, indicating Tid1 negatively regulates cell motility through NF-κB-dependent IL-8 transcription.","method":"siRNA knockdown, microarray, ELISA, neutralizing antibody, promoter mutation, migration assay, in vivo metastasis model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown, multiple mechanistic validations (promoter mutation, neutralizing antibody), in vivo metastasis assay, single lab with multiple orthogonal methods","pmids":["16204048"],"is_preprint":false},{"year":2005,"finding":"Tid-1(L) directly interacts with pVHL (confirmed in vitro and in vivo), enhances the HIF-1α/pVHL interaction leading to destabilization of HIF-1α protein, thereby decreasing VEGF expression and inhibiting angiogenesis in vitro and in vivo.","method":"Yeast two-hybrid, co-immunoprecipitation (in vitro and in vivo), HIF-1α stability assays, VEGF expression assay, in vivo angiogenesis assay","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, functional HIF-1α stability and angiogenesis assays, single lab","pmids":["15805242"],"is_preprint":false},{"year":2005,"finding":"TID1 associates with Trk receptor tyrosine kinases at the kinase activation loop. TID1 is tyrosine phosphorylated by Trk both in yeast and transfected cells, and endogenous TID1 is co-immunoprecipitated with and tyrosine-phosphorylated by Trk in neurotrophin-stimulated primary hippocampal neurons. Both TID1(L) and TID1(S) facilitate NGF-induced neurite outgrowth through a mechanism involving increased MAPK activation; shRNA knockdown of TID1 reduces NGF-induced neurite growth.","method":"Yeast two-hybrid, binding assays, co-immunoprecipitation, tyrosine phosphorylation assays in transfected cells and primary neurons, shRNA knockdown, neurite outgrowth assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP in primary neurons, phosphorylation mapping, loss-of-function with specific phenotype, multiple orthogonal methods","pmids":["15753086"],"is_preprint":false},{"year":2006,"finding":"Tid1-L and Tid1-S form heterocomplexes; both isoforms localize to mitochondrial nucleoids (large protein-DNA complexes bound to mtDNA). Tid1-L has a longer cytosolic residency time and greater stability than Tid1-S prior to mitochondrial import; Tid1-S is rapidly degraded in the cytosol. The unique C-terminal domain of Tid1-L is required for interaction with cytosolic Hsc70 and the STAT1 and STAT3 transcription factors, which explains its longer cytosolic half-life. Tid1 functionally substitutes for the yeast mitochondrial DnaJ-like protein Mdj1p.","method":"Subcellular fractionation, live-cell imaging/FRAP, co-immunoprecipitation, yeast complementation assay, domain deletion mutants, pulse-chase stability assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (fractionation, imaging, Co-IP, yeast complementation, domain mutagenesis, pulse-chase), single lab with rigorous controls","pmids":["16531398"],"is_preprint":false},{"year":2005,"finding":"Tid1 is required for T cell transition from the DN3 to double-positive stage. Tid1-deficient thymocytes show reduced DN4 proliferation and significant cell death with reduced Bcl-2 expression. Restoration of Bcl-2 expression by transgenic human bcl-2 reverses the developmental defect in Tid1-null thymus, establishing that Tid1 promotes thymocyte survival through regulation of Bcl-2 expression.","method":"T cell-specific conditional KO mice, flow cytometry, TUNEL assay, Bcl-2 transgenic rescue","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific genetic KO, genetic rescue with Bcl-2 transgene establishing pathway position, multiple cellular readouts","pmids":["15879105"],"is_preprint":false},{"year":2008,"finding":"Tid1 binds to the cytoplasmic domain of MuSK (identified by yeast two-hybrid), co-localizes with AChRs at motor endplates, and is required for agrin-induced AChR clustering. Tid1 knockdown disperses synaptic AChR clusters, impairs neuromuscular transmission, inhibits agrin-induced Rac and Rho GTPase activation, and reduces AChR tyrosine phosphorylation without affecting MuSK activation. Overexpression of the N-terminal half of Tid1 induces agrin/MuSK-independent AChR phosphorylation and clustering.","method":"Yeast two-hybrid, shRNA knockdown in skeletal muscle fibers, AChR clustering assays, electrophysiology, Rac/Rho activation assays, phosphorylation assays, overexpression","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo shRNA knockdown in muscle fibers with electrophysiology, multiple downstream signaling assays, gain-of-function, multiple orthogonal methods","pmids":["19038220"],"is_preprint":false},{"year":2009,"finding":"Tid1 forms a complex with p53 under hypoxic conditions and directs p53 translocation to the mitochondria, initiating the transcription-independent mitochondrial apoptosis pathway. Tid1 loss abrogates mitochondrial p53 translocation and inhibits apoptosis; Tid1 overexpression promotes p53 mitochondrial localization and apoptosis. Both the mitochondrial signal sequence and DnaJ domain of Tid1 are required for p53-Tid1 complex translocation from cytosol to mitochondria.","method":"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, overexpression with domain deletion mutants, apoptosis assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP, fractionation, loss- and gain-of-function with domain mutants, multiple functional readouts in single rigorous study","pmids":["19935715"],"is_preprint":false},{"year":2010,"finding":"Tid1 directly interacts with p53 (confirmed by far-western analysis). The DnaJ domain of Tid1 is necessary for this interaction, while either the N- or C-terminal domains of p53 are sufficient. shRNA depletion of Tid1 in breast cancer cells prevents p53 accumulation at mitochondria and confers resistance to apoptosis under hypoxic or genotoxic stress.","method":"Far-western blotting, domain deletion mutant constructs, shRNA knockdown, subcellular fractionation, apoptosis assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — far-western direct binding with domain mapping, loss-of-function with specific phenotype, single lab","pmids":["21311096"],"is_preprint":false},{"year":2011,"finding":"Human mortalin (mtHsp70) together with either Tid1-L or Tid1-S co-chaperones can mediate in vitro ATP-dependent reactivation of heat-denatured protein aggregates (disaggregation activity), with the assistance of the nucleotide exchange factor Mge1.","method":"In vitro reconstitution of disaggregation activity using purified mortalin, Tid1-L, Tid1-S, and Mge1; enzyme activity assays with model substrates","journal":"Cell stress & chaperones","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified components, biochemical activity assay, single lab","pmids":["21811887"],"is_preprint":false},{"year":2011,"finding":"hTid-1(S) binds to unphosphorylated c-Met receptor (MetR) and dissociates upon HGF stimulation. Overexpression of hTid-1(S) enhances MetR kinase activity and HGF-mediated cell migration. Knockdown of hTid-1 impairs both onset and amplitude of MetR phosphorylation in response to HGF without altering receptor protein levels, and inhibits ERK/MAPK and STAT3 pathways.","method":"Co-immunoprecipitation, overexpression, siRNA knockdown, kinase phosphorylation assays, migration assays, Western blotting","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, loss- and gain-of-function, multiple signaling pathway readouts, single lab","pmids":["21242965"],"is_preprint":false},{"year":2012,"finding":"Altered levels of DnaJA3/Tid1 (either overexpression or suppression) induce mitochondrial fragmentation in HeLa cells. The DnaJ domain (amino acids 88–168) is sufficient for fragmentation induction. An H121Q point mutation in the DnaJ domain that abolishes mtHsp70 ATPase interaction eliminates fragmentation. DnaJA3-induced fragmentation is dependent on the fission factor Drp1, and is specific to DnaJA3 (not seen with other DnaJA family members or HSC20).","method":"Overexpression, siRNA knockdown, domain deletion and point mutant constructs, live-cell imaging of mitochondrial morphology, Drp1 KO rescue","journal":"The international journal of biochemistry & cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — point mutagenesis establishing mechanism, Drp1 dependence, specificity controls with other family members, multiple orthogonal methods","pmids":["22595283"],"is_preprint":false},{"year":2013,"finding":"Tid1-L (but not Tid1-S) interacts with EGFR/HSP70/HSP90 through its DnaJ domain, counteracts HSP90's stabilizing function on EGFR, causing EGFR ubiquitination and proteasomal degradation, thereby attenuating EGFR signaling and inhibiting lung cancer cell proliferation.","method":"Co-immunoprecipitation, overexpression, siRNA knockdown, DnaJ domain mutants, ubiquitination assays, in vivo xenograft models","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, ubiquitination assay, loss- and gain-of-function, in vivo tumor model, multiple orthogonal methods","pmids":["23698466"],"is_preprint":false},{"year":2014,"finding":"TID1 silencing leads to focal increases in mitochondrial membrane potential (Δψ) heterogeneity and ultimately loss of mtDNA and inhibition of oxygen consumption. The J-domain of TID1 is required to rescue Δψ homogeneity. Complex I aggregation underlies the focal Δψ accumulation in TID1-silenced cells. Low-dose oligomycin (ATP synthase inhibitor) phenocopies TID1 loss, indicating a connection between TID1, mitochondrial bioenergetics, and complex I stability.","method":"RNAi knockdown, mitochondrial membrane potential assays, mtDNA quantification, oxygen consumption assays, blue-native gel electrophoresis for complex I, J-domain mutant rescue","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNAi with J-domain rescue, blue-native gel biochemistry, multiple mitochondrial functional readouts, mechanistic connection to complex I, single lab","pmids":["24492964"],"is_preprint":false},{"year":2015,"finding":"Tid1 is an essential mediator of canonical macroautophagy. Ectopic expression of Tid1 induces autophagy (LC3+ autophagosome foci), while Tid1 silencing drastically impairs autophagy induced by nutrient deprivation or rapamycin. Tid1 increases autophagy flux by interacting with the Beclin1-PI3K class III protein complex and connects IκB kinases to the Beclin1-containing autophagy complex.","method":"Overexpression, siRNA knockdown, co-immunoprecipitation with Beclin1 complex, autophagy flux assays, LC3 puncta imaging","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with Beclin1 complex, loss- and gain-of-function with specific autophagy readouts, single lab","pmids":["26055714"],"is_preprint":false},{"year":2006,"finding":"Chicken/mammalian Tid1 binds to Smad7 (and other Smad family members) through the Smad MH2 domain. Co-expression of Tid1 blocks the dorsalizing and BMP-dependent regulatory activity of Smad7 in developing Xenopus embryos, indicating functional interaction in vivo.","method":"Yeast two-hybrid, co-immunoprecipitation, Xenopus embryo overexpression/co-expression functional assay","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping confirmed in Xenopus in vivo functional assay, single lab","pmids":["16156721"],"is_preprint":false},{"year":2017,"finding":"Tid1-S governs the mitochondrial localization of EGFR through the mtHSP70 transportation pathway. The DnaJ domain of Tid1-S is essential for Tid1-S-mediated EGFR transport into mitochondria. Mitochondrial EGFR promotes NSCLC cell migration and invasion.","method":"Overexpression of Tid1-S and DnaJ domain mutants, subcellular fractionation, co-immunoprecipitation, migration/invasion assays","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — DnaJ domain mutagenesis, fractionation, functional migration assay, single lab","pmids":["28714950"],"is_preprint":false},{"year":2018,"finding":"Tid1 interacts with Galectin-7 (identified by affinity chromatography/mass spectrometry) via N-linked glycosylation of Galectin-7, and promotes ubiquitination and proteasomal degradation of Galectin-7. Tid1 also abolishes nuclear translocation of Galectin-7. Keratinocyte-specific Tid1-deficient mice show increased Galectin-7 levels, and Galectin-7 promotes metastasis through TCF3-MMP9 axis.","method":"Affinity chromatography, mass spectrometry, co-immunoprecipitation, ubiquitination assays, subcellular localization imaging, tissue-specific KO mouse model","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — affinity chromatography/MS for interaction discovery, confirmed by Co-IP, ubiquitination assay, in vivo KO model, single lab","pmids":["30083263"],"is_preprint":false},{"year":2018,"finding":"Tid1 overexpression enhances CHIP expression and induces CHIP-mediated ubiquitination and degradation of Gαs. The Tid1-CHIP complex plays an essential role in inhibiting ISO-induced cardiomyoblast hypertrophy and apoptosis, with Gαs identified as a novel substrate of CHIP.","method":"Co-immunoprecipitation, Western blotting, overexpression, ubiquitination assays, hypertrophy and apoptosis assays in H9c2 cells","journal":"International journal of medical sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — Co-IP and overexpression only, single lab, limited mechanistic detail in abstract","pmids":["30443176"],"is_preprint":false},{"year":2019,"finding":"DNAJA3 interacts with FMDV capsid protein VP1 (J domain, aa 1–168, mediates interaction; K208 of VP1 is critical). DNAJA3 induces lysosomal degradation of VP1 through interaction with LC3 to enhance the lysosomal pathway. DNAJA3 also attenuates VP1-mediated suppression of IFN-β signaling (VP1 inhibits IRF3 phosphorylation, dimerization, and nuclear translocation). DNAJA3 knockout enhances VP1-mediated IRF3 suppression.","method":"Yeast two-hybrid, co-immunoprecipitation, colocalization, domain mapping, K208A mutant virus, DNAJA3 KO cells, LC3 interaction assay, IFN-β reporter, IRF3 phosphorylation/dimerization/nuclear translocation assays","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP confirmed with KO cells and domain mapping, multiple mechanistic pathways validated, viral mutant used for functional confirmation","pmids":["30996089"],"is_preprint":false},{"year":2019,"finding":"HSPA1A and HSPA8 are the HSP70 family proteins that physically interact with DNAJA3. DNAJA3/HSP70 complex regulates canonical NF-κB signaling during immune responses: HSP70 inhibition destabilizes the IKKβ/IκBα/NF-κB p65 complex and dampens NF-κB p65 phosphorylation in response to flagellin. This regulatory function is evolutionarily conserved (Drosophila Hsc70-4/Droj2 similarly required for immune signaling).","method":"Co-immunoprecipitation, HSP70 inhibitor treatment, siRNA knockdown, NF-κB phosphorylation assays, Drosophila genetic knockdown with infection assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP identifying specific HSP70 partners, kinase assays, evolutionary genetic validation in Drosophila, single lab","pmids":["31005254"],"is_preprint":false},{"year":2019,"finding":"A human homozygous variant p.(Arg151Thr) in TID1 (associated with developmental delay and polyneuropathy) imports efficiently into mitochondria but at a reduced rate compared to wild type. The disaggregation/chaperone activity of the mortalin/Tid1 team is compromised in the R151T variant, functioning at a level similar to the non-functional H→Q HPD-domain variant.","method":"In vitro mitochondrial import assay, in vitro protein disaggregation/chaperone activity assay, comparison to HPD domain mutant","journal":"European journal of human genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of import and disaggregation, direct comparison with known inactive variant, single lab but multiple biochemical assays","pmids":["30770860"],"is_preprint":false},{"year":2021,"finding":"In ClpP-null mouse cells, DNAJA3 accumulates and migrates aberrantly in blue-native gels (mitochondrial unfolded protein response). Its mitochondrial dysregulation increases DNAJA3 abundance in the nucleus. STAT1 (a putative DNAJA3 interactor) is similarly upregulated, and innate immune/interferon-stimulated gene expression (RLR sensors, nucleic acid sensors) is elevated, linking DNAJA3 nuclear redistribution to innate immune activation.","method":"Mass spectrometry, subcellular fractionation, blue-native PAGE, immunoblot, RT-PCR in ClpP-null mouse brain and fibroblasts","journal":"Neurogenetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — fractionation and proteomics from a KO model for a different gene, DNAJA3 nuclear localization is an associated finding without direct functional manipulation of DNAJA3","pmids":["34345994"],"is_preprint":false},{"year":2022,"finding":"Solution NMR spectroscopy of human Tid1 J-domain (JD) and GF-motif reveals that Tid1-JD adopts a conformation consistent with DNAJB1 (not DNAJA1/2), and stably interacts with its subsequent GF-motif. This structural resemblance to DNAJB subfamily suggests allosteric regulation of mortalin (mtHsp70) by Tid1 similar to DNAJB members.","method":"Nuclear magnetic resonance (NMR) spectroscopy, sequence analysis","journal":"BMB reports","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structure determination with intramolecular interaction validation, single lab, no functional mutagenesis","pmids":["35651334"],"is_preprint":false}],"current_model":"DNAJA3/TID1 is a mitochondrially targeted DnaJ/Hsp40 co-chaperone that activates mtHsp70 (mortalin) ATPase via its J domain to mediate protein disaggregation, mitochondrial nucleoid maintenance, complex I stability, and mitochondrial membrane potential homeostasis; through isoform-specific cytosolic residency (Tid1-L > Tid1-S), it also acts as an Hsc70 co-chaperone that directs client proteins including p53, EGFR, ErbB-2, HIF-1α, and Galectin-7 toward proteasomal or lysosomal degradation, modulates NF-κB signaling by suppressing IKK activity in a J-domain-dependent manner, regulates apoptosis through opposing isoform activities (Tid1-L pro-apoptotic, Tid1-S anti-apoptotic), transduces agrin-MuSK signaling at the neuromuscular junction via Rac/Rho GTPase activation, and promotes Drp1-dependent mitochondrial fission when overexpressed."},"narrative":{"mechanistic_narrative":"DNAJA3 (TID1/hTid-1) is a DnaJ/Hsp40 co-chaperone that pairs its J domain with Hsp70-family chaperones to control client protein fate, mitochondrial integrity, and apoptotic signaling [PMID:10411904, PMID:14993262, PMID:21811887]. The gene produces two alternatively spliced matrix-targeted isoforms, hTid-1(L) and hTid-1(S), that both bind mitochondrial Hsp70 and exert opposing effects on apoptosis in a J-domain-dependent manner, with the longer isoform showing extended cytosolic residency conferred by a unique C-terminal domain that engages cytosolic Hsc70 and STAT transcription factors [PMID:10411904, PMID:16531398]. With mitochondrial Hsp70/mortalin and the nucleotide exchange factor Mge1, Tid1 reconstitutes ATP-dependent protein disaggregation activity, and a disease-associated p.(Arg151Thr) variant linked to developmental delay and polyneuropathy compromises this chaperone activity to a degree comparable to a catalytically dead HPD-domain mutant [PMID:21811887, PMID:30770860]. This chaperone function underlies essential roles in cell survival, demonstrated by embryonic lethality of Tid1-null mice and Hsp70-binding-dependent rescue of cell death [PMID:14993262], thymocyte survival via Bcl-2 [PMID:15879105], and maintenance of mitochondrial membrane potential, mtDNA, and complex I stability through the J domain [PMID:24492964]. In the cytosol, Tid1 directs clients toward degradation or relocalization: it counteracts HSP90 stabilization of EGFR to drive its ubiquitination and proteasomal degradation [PMID:23698466], promotes ubiquitin-dependent turnover of Galectin-7 [PMID:30083263], suppresses ErbB-2 expression and downstream ERK/BMK1 signaling [PMID:15520177], and forms a complex with p53 to drive its mitochondrial translocation and transcription-independent apoptosis [PMID:19935715, PMID:21311096]. Tid1 is a J-domain-dependent negative regulator of NF-κB, binding the IκB/IKK complex to suppress IKK activity, stabilize IκB, and limit NF-κB-dependent IL-8 transcription and cell motility [PMID:11927590, PMID:15601829, PMID:16204048]. It additionally modulates receptor tyrosine kinase signaling at Trk, c-Met, and the agrin-MuSK axis of the neuromuscular junction, where it is required for AChR clustering via Rac/Rho GTPase activation [PMID:15753086, PMID:21242965, PMID:19038220], and when overexpressed drives Drp1-dependent mitochondrial fission [PMID:22595283].","teleology":[{"year":1999,"claim":"Established that TID1 encodes two mitochondrial Hsp70-binding isoforms with opposing, J-domain-dependent effects on apoptosis, defining the gene as a co-chaperone with isoform-specific regulatory output.","evidence":"Co-IP and overexpression of wild-type versus J-domain mutant isoforms with apoptosis assays","pmids":["10411904"],"confidence":"High","gaps":["Did not define the molecular clients whose folding/fate the isoforms control","Mechanism of opposing isoform activity not resolved at substrate level"]},{"year":2001,"claim":"Showed Tid1 binds active Trk-family and Jak2 kinases and the IFN-γ receptor, positioning the co-chaperone as a modulator of receptor/cytokine signaling complexes.","evidence":"Yeast two-hybrid, endogenous Co-IP, chimeric kinase domain constructs, and transcriptional reporter assays","pmids":["11679576"],"confidence":"High","gaps":["Whether Hsp70 recruitment is required for kinase modulation not established","Functional consequence on IFN-γ output mechanistically incomplete"]},{"year":2002,"claim":"Defined Tid1 as a J-domain-dependent suppressor of NF-κB by inhibiting IKKβ-mediated IκB phosphorylation, prolonging IκB half-life.","evidence":"Kinase assays, NF-κB reporter assays, IκB stability assays, and J-domain mutant constructs","pmids":["11927590"],"confidence":"High","gaps":["How the J domain mechanistically suppresses IKK activity not resolved","Did not identify the chaperone client within the IKK complex"]},{"year":2004,"claim":"Demonstrated that Tid1's Hsp70 interaction is essential for organismal and cellular survival, anchoring the chaperone function to viability.","evidence":"Conditional knockout mice with embryonic lethality and cell-death rescue using wild-type versus J-domain mutant constructs","pmids":["14993262"],"confidence":"High","gaps":["The specific survival-critical clients were not identified","Tissue-level requirements beyond MEFs not dissected here"]},{"year":2005,"claim":"Extended the NF-κB model by showing direct association with the IκB/IKK complex and linked Tid1 loss to NF-κB-driven IL-8 transcription and cancer cell motility, and established a survival role in thymocytes via Bcl-2.","evidence":"Direct binding and IKK activity assays, siRNA knockdown with promoter mutation and neutralizing antibody, plus T-cell conditional KO with Bcl-2 transgenic rescue","pmids":["15601829","16204048","15879105"],"confidence":"High","gaps":["Mechanistic basis for cytoplasmic retention of IκB by Tid1 not fully defined","Connection between mitochondrial and cytosolic functions left open"]},{"year":2005,"claim":"Identified RTK and developmental signaling clients (Trk, ErbB-2, HIF-1α/pVHL), showing Tid1 can both promote neurite outgrowth and suppress oncogenic receptor signaling and angiogenesis.","evidence":"Yeast two-hybrid, Co-IP in primary neurons with phosphorylation mapping, domain mutants, stability and angiogenesis assays","pmids":["15753086","15520177","15805242"],"confidence":"High","gaps":["Context-dependence of pro- versus anti-signaling outcomes not unified","Direct enzymatic role of the J domain in client degradation not shown"]},{"year":2006,"claim":"Resolved the isoform divergence mechanism: a unique Tid1-L C-terminal domain mediates cytosolic Hsc70/STAT binding and prolonged residency, while both isoforms localize to mitochondrial nucleoids and functionally substitute for yeast Mdj1p.","evidence":"Subcellular fractionation, FRAP imaging, Co-IP, yeast complementation, domain deletion, and pulse-chase stability assays","pmids":["16531398"],"confidence":"High","gaps":["Functional role of nucleoid localization not mechanistically tied to a phenotype here","How cytosolic residency dictates client selection not fully resolved"]},{"year":2009,"claim":"Showed Tid1 forms a p53 complex and drives transcription-independent mitochondrial apoptosis, requiring both the mitochondrial targeting sequence and J domain.","evidence":"Co-IP, fractionation, siRNA and overexpression with domain deletion mutants, and apoptosis assays; direct binding confirmed by far-western with domain mapping","pmids":["19935715","21311096"],"confidence":"High","gaps":["How the J domain couples p53 to the mitochondrial import machinery not detailed","Relationship to Hsp70-dependent disaggregation activity unresolved"]},{"year":2011,"claim":"Provided the biochemical core: reconstituted ATP-dependent disaggregation by mortalin with either Tid1 isoform plus Mge1, defining the canonical chaperone activity, while a separate study placed Tid1-S as a c-Met activator.","evidence":"In vitro reconstitution with purified mortalin, Tid1-L/S, and Mge1; Co-IP and kinase/migration assays for c-Met","pmids":["21811887","21242965"],"confidence":"High","gaps":["Substrate spectrum of the disaggregase in vivo not mapped","How the same J-domain activity yields opposite signaling outcomes across receptors unclear"]},{"year":2013,"claim":"Established a degradation-directing role: Tid1-L engages EGFR/HSP70/HSP90 to counteract HSP90 stabilization, driving EGFR ubiquitination and proteasomal turnover, with a later study showing Tid1-S instead routes EGFR into mitochondria.","evidence":"Co-IP with domain mapping, ubiquitination assays, knockdown/overexpression, xenografts; and subcellular fractionation with DnaJ mutants for mitochondrial transport","pmids":["23698466","28714950"],"confidence":"High","gaps":["Determinants selecting degradation versus mitochondrial import of EGFR not defined","Whether the two fates are mutually exclusive within a cell unknown"]},{"year":2012,"claim":"Connected Tid1 chaperone activity to mitochondrial dynamics, showing dysregulation triggers Drp1-dependent fission via a specific J-domain ATPase-coupling residue.","evidence":"Overexpression, knockdown, H121Q point mutant, live-cell imaging, and Drp1-KO rescue with family-member specificity controls","pmids":["22595283"],"confidence":"High","gaps":["Whether fission reflects a physiological or stress-overexpression response not settled","Link between fission and disaggregation activity not established"]},{"year":2014,"claim":"Defined the bioenergetic role: Tid1 J-domain activity maintains membrane potential homogeneity, mtDNA, and complex I assembly, preventing complex I aggregation.","evidence":"RNAi with J-domain rescue, membrane potential and oxygen consumption assays, mtDNA quantification, and blue-native PAGE for complex I","pmids":["24492964"],"confidence":"High","gaps":["Whether complex I subunits are direct disaggregase substrates not proven","Mechanism linking aggregation to focal Δψ accumulation incomplete"]},{"year":2018,"claim":"Broadened the degradation-directing repertoire to Galectin-7 and (with lower confidence) Gαs via CHIP, reinforcing Tid1 as a routing factor for client ubiquitination.","evidence":"Affinity chromatography/MS, Co-IP, ubiquitination assays, localization imaging, and tissue-specific KO; CHIP/Gαs study by Co-IP and overexpression only","pmids":["30083263","30443176"],"confidence":"Medium","gaps":["Gαs/CHIP findings rest on Co-IP and overexpression without domain mutagenesis","Whether Galectin-7 turnover requires Hsp70 cooperation not tested"]},{"year":2019,"claim":"Identified the specific cytosolic Hsp70 partners (HSPA1A, HSPA8), reinforced J-domain-dependent NF-κB control in immunity, and revealed antiviral roles routing viral proteins to lysosomal degradation while restoring IFN signaling.","evidence":"Co-IP with HSP70 inhibition and Drosophila genetic validation for NF-κB; Co-IP, domain mapping, KO cells, LC3 interaction, and IFN-β/IRF3 assays for FMDV VP1; in vitro import/disaggregation assays for the R151T disease variant","pmids":["31005254","30996089","30770860"],"confidence":"High","gaps":["How a single co-chaperone toggles between proteasomal and lysosomal client routing unresolved","Disease variant phenotype not yet mechanistically tied to a specific tissue substrate"]},{"year":2022,"claim":"Provided structural insight, with NMR showing the Tid1 J-domain/GF-motif resembles the DNAJB subfamily, implying a DNAJB-like mode of allosteric mortalin regulation.","evidence":"Solution NMR spectroscopy of the J-domain and GF-motif with sequence analysis","pmids":["35651334"],"confidence":"Medium","gaps":["No functional mutagenesis tied the DNAJB-like conformation to activity","Full-length structure and client-bound states not determined"]},{"year":null,"claim":"How a single co-chaperone selects between disaggregation, proteasomal degradation, lysosomal targeting, and mitochondrial import of its many clients, and how isoform identity and cytosolic versus mitochondrial residency dictate this choice, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model links client routing decisions to isoform or compartment","Comprehensive in vivo substrate catalog of the mortalin/Tid1 disaggregase is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,7,17,20]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[17,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,8,19]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[15,16,20]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,12,21,24]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[12,8,20]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[17,20,25]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,13,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[4,8,11,18,14]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[19,21]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[28,27]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[22,27]}],"complexes":["mortalin (mtHsp70)/Tid1/Mge1 disaggregase","mitochondrial nucleoid","IKK/IκB/NF-κB complex","Beclin1-PI3K class III complex"],"partners":["HSPA9","HSPA8","HSPA1A","TP53","EGFR","IKBKB","MUSK","VHL"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96EY1","full_name":"DnaJ homolog subfamily A member 3, mitochondrial","aliases":["DnaJ protein Tid-1","hTid-1","Hepatocellular carcinoma-associated antigen 57","Tumorous imaginal discs protein Tid56 homolog"],"length_aa":480,"mass_kda":52.5,"function":"Modulates apoptotic signal transduction or effector structures within the mitochondrial matrix. Affect cytochrome C release from the mitochondria and caspase 3 activation, but not caspase 8 activation. Isoform 1 increases apoptosis triggered by both TNF and the DNA-damaging agent mytomycin C; in sharp contrast, isoform 2 suppresses apoptosis. Can modulate IFN-gamma-mediated transcriptional activity. Isoform 2 may play a role in neuromuscular junction development as an effector of the MUSK signaling pathway","subcellular_location":"Mitochondrion matrix; Cytoplasm, cytosol; Postsynaptic cell membrane","url":"https://www.uniprot.org/uniprotkb/Q96EY1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/DNAJA3","classification":"Common Essential","n_dependent_lines":1151,"n_total_lines":1208,"dependency_fraction":0.9528145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DNAJA3","total_profiled":1310},"omim":[{"mim_id":"608382","title":"DNAJ/HSP40 HOMOLOG, SUBFAMILY A, MEMBER 3; DNAJA3","url":"https://www.omim.org/entry/608382"},{"mim_id":"608299","title":"RING FINGER PROTEIN 34; RNF34","url":"https://www.omim.org/entry/608299"},{"mim_id":"601296","title":"MUSCLE, SKELETAL, RECEPTOR TYROSINE KINASE; MUSK","url":"https://www.omim.org/entry/601296"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Mitochondria","reliability":"Supported"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in 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stages.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/15879105","citation_count":12,"is_preprint":false},{"pmid":"22016808","id":"PMC_22016808","title":"Identification of bilateral changes in TID1 expression in the 6-OHDA rat model of Parkinson's disease.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22016808","citation_count":12,"is_preprint":false},{"pmid":"35854300","id":"PMC_35854300","title":"Putting human Tid-1 in context: an insight into its role in the cell and in different disease states.","date":"2022","source":"Cell communication and signaling : CCS","url":"https://pubmed.ncbi.nlm.nih.gov/35854300","citation_count":11,"is_preprint":false},{"pmid":"26245905","id":"PMC_26245905","title":"The Role of the Phylogenetically Conserved Cochaperone Protein Droj2/DNAJA3 in NF-κB Signaling.","date":"2015","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26245905","citation_count":11,"is_preprint":false},{"pmid":"23473644","id":"PMC_23473644","title":"Tid1/Rdh54 translocase is phosphorylated through a Mec1- and Rad53-dependent manner in the presence of DSB lesions in budding yeast.","date":"2013","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/23473644","citation_count":11,"is_preprint":false},{"pmid":"37487907","id":"PMC_37487907","title":"DNAJA3 regulates B cell development and immune function.","date":"2023","source":"Biomedical journal","url":"https://pubmed.ncbi.nlm.nih.gov/37487907","citation_count":10,"is_preprint":false},{"pmid":"31081962","id":"PMC_31081962","title":"Tid1-S attenuates LPS-induced cardiac hypertrophy and apoptosis through ER-a mediated modulation of p-PI3K/p-Akt signaling cascade.","date":"2019","source":"Journal of cellular 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Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/37870291","citation_count":5,"is_preprint":false},{"pmid":"29458764","id":"PMC_29458764","title":"Purification of Saccharomyces cerevisiae Homologous Recombination Proteins Dmc1 and Rdh54/Tid1 and a Fluorescent D-Loop Assay.","date":"2018","source":"Methods in enzymology","url":"https://pubmed.ncbi.nlm.nih.gov/29458764","citation_count":5,"is_preprint":false},{"pmid":"39132696","id":"PMC_39132696","title":"Regimen on Dnaja3 haploinsufficiency mediated sarcopenic obesity with imbalanced mitochondrial homeostasis and lipid metabolism.","date":"2024","source":"Journal of cachexia, sarcopenia and muscle","url":"https://pubmed.ncbi.nlm.nih.gov/39132696","citation_count":4,"is_preprint":false},{"pmid":"40233912","id":"PMC_40233912","title":"DNAJA3 interacts with ASFV MGF360-14L protein and reduces MGF360-14L antagonistic role on Beta interferon production.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40233912","citation_count":4,"is_preprint":false},{"pmid":"35651334","id":"PMC_35651334","title":"Structural resemblance of the DNAJA-family protein, Tid1, to the DNAJB-family Hsp40.","date":"2022","source":"BMB reports","url":"https://pubmed.ncbi.nlm.nih.gov/35651334","citation_count":4,"is_preprint":false},{"pmid":"33100870","id":"PMC_33100870","title":"Optimization of expression and purification of mitochondrial HSP 40 (Tid1-L) chaperone: Role of mortalin and tid1 in the reactivation and amyloid inhibition of proteins.","date":"2020","source":"Saudi journal of biological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33100870","citation_count":3,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":36463,"output_tokens":8781,"usd":0.120552,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18698,"output_tokens":5669,"usd":0.117608,"stage2_stop_reason":"end_turn"},"total_usd":0.23816,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"TID1 encodes two alternatively spliced mitochondrial matrix proteins, hTid-1(L) and hTid-1(S), both of which co-immunoprecipitate with mitochondrial Hsp70. They have opposing effects on apoptosis: hTid-1(L) promotes apoptosis induced by mitomycin C and TNFα in a J-domain-dependent manner, while hTid-1(S) suppresses apoptosis. A J-domain mutant of hTid-1(L) dominantly suppresses apoptosis, and a J-domain mutant of hTid-1(S) increases apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, overexpression of wild-type and J-domain mutant constructs, apoptosis assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP confirming Hsp70 interaction, domain mutagenesis establishing J-domain requirement, multiple orthogonal functional assays, replicated across isoforms\",\n      \"pmids\": [\"10411904\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"hTid-1 interacts with the HPV-16 E7 oncoprotein via E7's carboxyl-terminal cysteine-rich metal-binding domain, as determined by yeast two-hybrid screening and complex formation assays.\",\n      \"method\": \"Yeast two-hybrid screen, in vitro complex formation\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus domain-mapping, single lab, no reciprocal Co-IP from mammalian cells\",\n      \"pmids\": [\"9683573\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"hTid-1 interacts with Jak2 (confirmed by co-immunoprecipitation from COS-1 cells and with endogenous proteins in HEp2 cells) and with the IFN-γ receptor subunit IFN-γR2. hTid-1 binds preferentially to active Jak2 kinase domain and both hTid-1 isoforms and Jak2 interact with Hsp70/Hsc70 in vivo; this interaction is reduced after IFN-γ treatment. Both hTid-1(S) and hTid-1(L) modulate IFN-γ-mediated transcriptional activity.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation (including endogenous proteins), chimeric kinase domain constructs, transcriptional reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with endogenous proteins, multiple interaction partners confirmed, functional transcription assay, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"11679576\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"HTLV-1 Tax interacts with hTid-1 via the central cysteine-rich domain of hTid-1, while hTid-1's J domain mediates its binding to Hsp70. Tax associates with the hTid-1/Hsp70 molecular chaperone complex and alters cellular localization of hTid-1 and Hsp70, sequestering them from perinuclear mitochondrial clusters to a cytoplasmic 'hot spot' structure. hTid-1 expression inhibits the transformation phenotype of lung adenocarcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation, domain-mapping, confocal microscopy for subcellular localization, transformation assays\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, direct localization imaging with functional consequence, single lab\",\n      \"pmids\": [\"11719219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"hTid-1 represses NF-κB activity induced by Tax, TNFα, and Bcl10 by suppressing IKKβ-mediated serine phosphorylation of IκBα, requiring a functional J domain. This interaction prolongs the half-life of IκBα and IκBβ. hTid-1 does not affect activity of p38, ERK2, or JNK1.\",\n      \"method\": \"Co-immunoprecipitation, kinase assays, NF-κB reporter assays, J-domain mutant constructs, IκBα stability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — kinase activity assays, domain mutagenesis, multiple functional readouts, multiple orthogonal methods in single lab\",\n      \"pmids\": [\"11927590\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"hTid-1 interacts with the HSV-1 origin-binding protein UL9 (confirmed by in vitro immunoprecipitation), enhances UL9 binding to the HSV-1 origin oriS, and facilitates multimerization of dimeric UL9 protein, as shown by EMSA. hTid-1 has no effect on UL9's DNA-dependent ATPase or helicase activities.\",\n      \"method\": \"In vitro co-immunoprecipitation, electrophoretic mobility shift assay (EMSA), ATPase and helicase activity assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pull-down confirmed by EMSA, functional biochemical assays, single lab\",\n      \"pmids\": [\"11854491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Tid1 interacts with the cytoplasmic domain of ErbB-2/HER-2. Increased expression of Tid1 in ErbB-2-overexpressing mammary carcinoma cells suppresses ErbB-2 expression levels and attenuates ErbB-2-dependent ERK1/2 and BMK1 signaling, leading to programmed cell death. A functional DnaJ domain is required for this suppression of ErbB-2 expression and signaling.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, DnaJ domain mutant constructs, Western blotting for signaling pathway components, tumor progression assays in animals\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, domain mutagenesis, in vivo tumor model, multiple readouts, single lab\",\n      \"pmids\": [\"15520177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Embryonic lethality occurs between E4.5 and E7.5 in Tid1-null mice. In mouse embryonic fibroblasts, Tid1 removal causes massive cell death that is rescued by wild-type Tid1 but not by a J-domain mutant incapable of binding Hsp70, establishing that Tid1's essential role in cell survival requires its interaction with Hsp70.\",\n      \"method\": \"Conditional knockout mouse model, cell death assays, rescue with wild-type vs. J-domain mutant constructs\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic KO with embryonic lethality, cell death rescue assays with domain mutant, multiple genetic tools in single rigorous study\",\n      \"pmids\": [\"14993262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"hTid-1 strongly associates with the cytoplasmic NF-κB-IκB complex through direct interactions with IκBα/β and the IKKα/β subunits of the IKK complex, suppressing IKK activity in a J-domain-dependent manner and causing cytoplasmic retention and enhanced stability of IκB proteins.\",\n      \"method\": \"Co-immunoprecipitation, direct binding assays, IKK activity assays, J-domain deletion mutant, NF-κB reporter assays, tumor growth in nude mice\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — direct binding, kinase activity assays, domain mutagenesis, in vivo tumor model, multiple orthogonal methods\",\n      \"pmids\": [\"15601829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Tid1 depletion in MDA-MB231 breast cancer cells enhances migration and IL-8 secretion (~3.5-fold). The enhanced migration is blocked by reducing IL-8 expression or adding an IL-8 neutralizing antibody. The IL-8 promoter NF-κB binding site is required for Tid1 depletion-induced IL-8 upregulation, indicating Tid1 negatively regulates cell motility through NF-κB-dependent IL-8 transcription.\",\n      \"method\": \"siRNA knockdown, microarray, ELISA, neutralizing antibody, promoter mutation, migration assay, in vivo metastasis model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown, multiple mechanistic validations (promoter mutation, neutralizing antibody), in vivo metastasis assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"16204048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Tid-1(L) directly interacts with pVHL (confirmed in vitro and in vivo), enhances the HIF-1α/pVHL interaction leading to destabilization of HIF-1α protein, thereby decreasing VEGF expression and inhibiting angiogenesis in vitro and in vivo.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation (in vitro and in vivo), HIF-1α stability assays, VEGF expression assay, in vivo angiogenesis assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by Co-IP, functional HIF-1α stability and angiogenesis assays, single lab\",\n      \"pmids\": [\"15805242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"TID1 associates with Trk receptor tyrosine kinases at the kinase activation loop. TID1 is tyrosine phosphorylated by Trk both in yeast and transfected cells, and endogenous TID1 is co-immunoprecipitated with and tyrosine-phosphorylated by Trk in neurotrophin-stimulated primary hippocampal neurons. Both TID1(L) and TID1(S) facilitate NGF-induced neurite outgrowth through a mechanism involving increased MAPK activation; shRNA knockdown of TID1 reduces NGF-induced neurite growth.\",\n      \"method\": \"Yeast two-hybrid, binding assays, co-immunoprecipitation, tyrosine phosphorylation assays in transfected cells and primary neurons, shRNA knockdown, neurite outgrowth assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP in primary neurons, phosphorylation mapping, loss-of-function with specific phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"15753086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Tid1-L and Tid1-S form heterocomplexes; both isoforms localize to mitochondrial nucleoids (large protein-DNA complexes bound to mtDNA). Tid1-L has a longer cytosolic residency time and greater stability than Tid1-S prior to mitochondrial import; Tid1-S is rapidly degraded in the cytosol. The unique C-terminal domain of Tid1-L is required for interaction with cytosolic Hsc70 and the STAT1 and STAT3 transcription factors, which explains its longer cytosolic half-life. Tid1 functionally substitutes for the yeast mitochondrial DnaJ-like protein Mdj1p.\",\n      \"method\": \"Subcellular fractionation, live-cell imaging/FRAP, co-immunoprecipitation, yeast complementation assay, domain deletion mutants, pulse-chase stability assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (fractionation, imaging, Co-IP, yeast complementation, domain mutagenesis, pulse-chase), single lab with rigorous controls\",\n      \"pmids\": [\"16531398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Tid1 is required for T cell transition from the DN3 to double-positive stage. Tid1-deficient thymocytes show reduced DN4 proliferation and significant cell death with reduced Bcl-2 expression. Restoration of Bcl-2 expression by transgenic human bcl-2 reverses the developmental defect in Tid1-null thymus, establishing that Tid1 promotes thymocyte survival through regulation of Bcl-2 expression.\",\n      \"method\": \"T cell-specific conditional KO mice, flow cytometry, TUNEL assay, Bcl-2 transgenic rescue\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific genetic KO, genetic rescue with Bcl-2 transgene establishing pathway position, multiple cellular readouts\",\n      \"pmids\": [\"15879105\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Tid1 binds to the cytoplasmic domain of MuSK (identified by yeast two-hybrid), co-localizes with AChRs at motor endplates, and is required for agrin-induced AChR clustering. Tid1 knockdown disperses synaptic AChR clusters, impairs neuromuscular transmission, inhibits agrin-induced Rac and Rho GTPase activation, and reduces AChR tyrosine phosphorylation without affecting MuSK activation. Overexpression of the N-terminal half of Tid1 induces agrin/MuSK-independent AChR phosphorylation and clustering.\",\n      \"method\": \"Yeast two-hybrid, shRNA knockdown in skeletal muscle fibers, AChR clustering assays, electrophysiology, Rac/Rho activation assays, phosphorylation assays, overexpression\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo shRNA knockdown in muscle fibers with electrophysiology, multiple downstream signaling assays, gain-of-function, multiple orthogonal methods\",\n      \"pmids\": [\"19038220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Tid1 forms a complex with p53 under hypoxic conditions and directs p53 translocation to the mitochondria, initiating the transcription-independent mitochondrial apoptosis pathway. Tid1 loss abrogates mitochondrial p53 translocation and inhibits apoptosis; Tid1 overexpression promotes p53 mitochondrial localization and apoptosis. Both the mitochondrial signal sequence and DnaJ domain of Tid1 are required for p53-Tid1 complex translocation from cytosol to mitochondria.\",\n      \"method\": \"Co-immunoprecipitation, subcellular fractionation, siRNA knockdown, overexpression with domain deletion mutants, apoptosis assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, fractionation, loss- and gain-of-function with domain mutants, multiple functional readouts in single rigorous study\",\n      \"pmids\": [\"19935715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Tid1 directly interacts with p53 (confirmed by far-western analysis). The DnaJ domain of Tid1 is necessary for this interaction, while either the N- or C-terminal domains of p53 are sufficient. shRNA depletion of Tid1 in breast cancer cells prevents p53 accumulation at mitochondria and confers resistance to apoptosis under hypoxic or genotoxic stress.\",\n      \"method\": \"Far-western blotting, domain deletion mutant constructs, shRNA knockdown, subcellular fractionation, apoptosis assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — far-western direct binding with domain mapping, loss-of-function with specific phenotype, single lab\",\n      \"pmids\": [\"21311096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human mortalin (mtHsp70) together with either Tid1-L or Tid1-S co-chaperones can mediate in vitro ATP-dependent reactivation of heat-denatured protein aggregates (disaggregation activity), with the assistance of the nucleotide exchange factor Mge1.\",\n      \"method\": \"In vitro reconstitution of disaggregation activity using purified mortalin, Tid1-L, Tid1-S, and Mge1; enzyme activity assays with model substrates\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified components, biochemical activity assay, single lab\",\n      \"pmids\": [\"21811887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"hTid-1(S) binds to unphosphorylated c-Met receptor (MetR) and dissociates upon HGF stimulation. Overexpression of hTid-1(S) enhances MetR kinase activity and HGF-mediated cell migration. Knockdown of hTid-1 impairs both onset and amplitude of MetR phosphorylation in response to HGF without altering receptor protein levels, and inhibits ERK/MAPK and STAT3 pathways.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, siRNA knockdown, kinase phosphorylation assays, migration assays, Western blotting\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, loss- and gain-of-function, multiple signaling pathway readouts, single lab\",\n      \"pmids\": [\"21242965\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Altered levels of DnaJA3/Tid1 (either overexpression or suppression) induce mitochondrial fragmentation in HeLa cells. The DnaJ domain (amino acids 88–168) is sufficient for fragmentation induction. An H121Q point mutation in the DnaJ domain that abolishes mtHsp70 ATPase interaction eliminates fragmentation. DnaJA3-induced fragmentation is dependent on the fission factor Drp1, and is specific to DnaJA3 (not seen with other DnaJA family members or HSC20).\",\n      \"method\": \"Overexpression, siRNA knockdown, domain deletion and point mutant constructs, live-cell imaging of mitochondrial morphology, Drp1 KO rescue\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — point mutagenesis establishing mechanism, Drp1 dependence, specificity controls with other family members, multiple orthogonal methods\",\n      \"pmids\": [\"22595283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Tid1-L (but not Tid1-S) interacts with EGFR/HSP70/HSP90 through its DnaJ domain, counteracts HSP90's stabilizing function on EGFR, causing EGFR ubiquitination and proteasomal degradation, thereby attenuating EGFR signaling and inhibiting lung cancer cell proliferation.\",\n      \"method\": \"Co-immunoprecipitation, overexpression, siRNA knockdown, DnaJ domain mutants, ubiquitination assays, in vivo xenograft models\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, ubiquitination assay, loss- and gain-of-function, in vivo tumor model, multiple orthogonal methods\",\n      \"pmids\": [\"23698466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"TID1 silencing leads to focal increases in mitochondrial membrane potential (Δψ) heterogeneity and ultimately loss of mtDNA and inhibition of oxygen consumption. The J-domain of TID1 is required to rescue Δψ homogeneity. Complex I aggregation underlies the focal Δψ accumulation in TID1-silenced cells. Low-dose oligomycin (ATP synthase inhibitor) phenocopies TID1 loss, indicating a connection between TID1, mitochondrial bioenergetics, and complex I stability.\",\n      \"method\": \"RNAi knockdown, mitochondrial membrane potential assays, mtDNA quantification, oxygen consumption assays, blue-native gel electrophoresis for complex I, J-domain mutant rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with J-domain rescue, blue-native gel biochemistry, multiple mitochondrial functional readouts, mechanistic connection to complex I, single lab\",\n      \"pmids\": [\"24492964\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Tid1 is an essential mediator of canonical macroautophagy. Ectopic expression of Tid1 induces autophagy (LC3+ autophagosome foci), while Tid1 silencing drastically impairs autophagy induced by nutrient deprivation or rapamycin. Tid1 increases autophagy flux by interacting with the Beclin1-PI3K class III protein complex and connects IκB kinases to the Beclin1-containing autophagy complex.\",\n      \"method\": \"Overexpression, siRNA knockdown, co-immunoprecipitation with Beclin1 complex, autophagy flux assays, LC3 puncta imaging\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with Beclin1 complex, loss- and gain-of-function with specific autophagy readouts, single lab\",\n      \"pmids\": [\"26055714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Chicken/mammalian Tid1 binds to Smad7 (and other Smad family members) through the Smad MH2 domain. Co-expression of Tid1 blocks the dorsalizing and BMP-dependent regulatory activity of Smad7 in developing Xenopus embryos, indicating functional interaction in vivo.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, Xenopus embryo overexpression/co-expression functional assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping confirmed in Xenopus in vivo functional assay, single lab\",\n      \"pmids\": [\"16156721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Tid1-S governs the mitochondrial localization of EGFR through the mtHSP70 transportation pathway. The DnaJ domain of Tid1-S is essential for Tid1-S-mediated EGFR transport into mitochondria. Mitochondrial EGFR promotes NSCLC cell migration and invasion.\",\n      \"method\": \"Overexpression of Tid1-S and DnaJ domain mutants, subcellular fractionation, co-immunoprecipitation, migration/invasion assays\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — DnaJ domain mutagenesis, fractionation, functional migration assay, single lab\",\n      \"pmids\": [\"28714950\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tid1 interacts with Galectin-7 (identified by affinity chromatography/mass spectrometry) via N-linked glycosylation of Galectin-7, and promotes ubiquitination and proteasomal degradation of Galectin-7. Tid1 also abolishes nuclear translocation of Galectin-7. Keratinocyte-specific Tid1-deficient mice show increased Galectin-7 levels, and Galectin-7 promotes metastasis through TCF3-MMP9 axis.\",\n      \"method\": \"Affinity chromatography, mass spectrometry, co-immunoprecipitation, ubiquitination assays, subcellular localization imaging, tissue-specific KO mouse model\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — affinity chromatography/MS for interaction discovery, confirmed by Co-IP, ubiquitination assay, in vivo KO model, single lab\",\n      \"pmids\": [\"30083263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tid1 overexpression enhances CHIP expression and induces CHIP-mediated ubiquitination and degradation of Gαs. The Tid1-CHIP complex plays an essential role in inhibiting ISO-induced cardiomyoblast hypertrophy and apoptosis, with Gαs identified as a novel substrate of CHIP.\",\n      \"method\": \"Co-immunoprecipitation, Western blotting, overexpression, ubiquitination assays, hypertrophy and apoptosis assays in H9c2 cells\",\n      \"journal\": \"International journal of medical sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — Co-IP and overexpression only, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"30443176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DNAJA3 interacts with FMDV capsid protein VP1 (J domain, aa 1–168, mediates interaction; K208 of VP1 is critical). DNAJA3 induces lysosomal degradation of VP1 through interaction with LC3 to enhance the lysosomal pathway. DNAJA3 also attenuates VP1-mediated suppression of IFN-β signaling (VP1 inhibits IRF3 phosphorylation, dimerization, and nuclear translocation). DNAJA3 knockout enhances VP1-mediated IRF3 suppression.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, colocalization, domain mapping, K208A mutant virus, DNAJA3 KO cells, LC3 interaction assay, IFN-β reporter, IRF3 phosphorylation/dimerization/nuclear translocation assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP confirmed with KO cells and domain mapping, multiple mechanistic pathways validated, viral mutant used for functional confirmation\",\n      \"pmids\": [\"30996089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HSPA1A and HSPA8 are the HSP70 family proteins that physically interact with DNAJA3. DNAJA3/HSP70 complex regulates canonical NF-κB signaling during immune responses: HSP70 inhibition destabilizes the IKKβ/IκBα/NF-κB p65 complex and dampens NF-κB p65 phosphorylation in response to flagellin. This regulatory function is evolutionarily conserved (Drosophila Hsc70-4/Droj2 similarly required for immune signaling).\",\n      \"method\": \"Co-immunoprecipitation, HSP70 inhibitor treatment, siRNA knockdown, NF-κB phosphorylation assays, Drosophila genetic knockdown with infection assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP identifying specific HSP70 partners, kinase assays, evolutionary genetic validation in Drosophila, single lab\",\n      \"pmids\": [\"31005254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A human homozygous variant p.(Arg151Thr) in TID1 (associated with developmental delay and polyneuropathy) imports efficiently into mitochondria but at a reduced rate compared to wild type. The disaggregation/chaperone activity of the mortalin/Tid1 team is compromised in the R151T variant, functioning at a level similar to the non-functional H→Q HPD-domain variant.\",\n      \"method\": \"In vitro mitochondrial import assay, in vitro protein disaggregation/chaperone activity assay, comparison to HPD domain mutant\",\n      \"journal\": \"European journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of import and disaggregation, direct comparison with known inactive variant, single lab but multiple biochemical assays\",\n      \"pmids\": [\"30770860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In ClpP-null mouse cells, DNAJA3 accumulates and migrates aberrantly in blue-native gels (mitochondrial unfolded protein response). Its mitochondrial dysregulation increases DNAJA3 abundance in the nucleus. STAT1 (a putative DNAJA3 interactor) is similarly upregulated, and innate immune/interferon-stimulated gene expression (RLR sensors, nucleic acid sensors) is elevated, linking DNAJA3 nuclear redistribution to innate immune activation.\",\n      \"method\": \"Mass spectrometry, subcellular fractionation, blue-native PAGE, immunoblot, RT-PCR in ClpP-null mouse brain and fibroblasts\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — fractionation and proteomics from a KO model for a different gene, DNAJA3 nuclear localization is an associated finding without direct functional manipulation of DNAJA3\",\n      \"pmids\": [\"34345994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Solution NMR spectroscopy of human Tid1 J-domain (JD) and GF-motif reveals that Tid1-JD adopts a conformation consistent with DNAJB1 (not DNAJA1/2), and stably interacts with its subsequent GF-motif. This structural resemblance to DNAJB subfamily suggests allosteric regulation of mortalin (mtHsp70) by Tid1 similar to DNAJB members.\",\n      \"method\": \"Nuclear magnetic resonance (NMR) spectroscopy, sequence analysis\",\n      \"journal\": \"BMB reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structure determination with intramolecular interaction validation, single lab, no functional mutagenesis\",\n      \"pmids\": [\"35651334\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DNAJA3/TID1 is a mitochondrially targeted DnaJ/Hsp40 co-chaperone that activates mtHsp70 (mortalin) ATPase via its J domain to mediate protein disaggregation, mitochondrial nucleoid maintenance, complex I stability, and mitochondrial membrane potential homeostasis; through isoform-specific cytosolic residency (Tid1-L > Tid1-S), it also acts as an Hsc70 co-chaperone that directs client proteins including p53, EGFR, ErbB-2, HIF-1α, and Galectin-7 toward proteasomal or lysosomal degradation, modulates NF-κB signaling by suppressing IKK activity in a J-domain-dependent manner, regulates apoptosis through opposing isoform activities (Tid1-L pro-apoptotic, Tid1-S anti-apoptotic), transduces agrin-MuSK signaling at the neuromuscular junction via Rac/Rho GTPase activation, and promotes Drp1-dependent mitochondrial fission when overexpressed.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DNAJA3 (TID1/hTid-1) is a DnaJ/Hsp40 co-chaperone that pairs its J domain with Hsp70-family chaperones to control client protein fate, mitochondrial integrity, and apoptotic signaling [#0, #7, #17]. The gene produces two alternatively spliced matrix-targeted isoforms, hTid-1(L) and hTid-1(S), that both bind mitochondrial Hsp70 and exert opposing effects on apoptosis in a J-domain-dependent manner, with the longer isoform showing extended cytosolic residency conferred by a unique C-terminal domain that engages cytosolic Hsc70 and STAT transcription factors [#0, #12]. With mitochondrial Hsp70/mortalin and the nucleotide exchange factor Mge1, Tid1 reconstitutes ATP-dependent protein disaggregation activity, and a disease-associated p.(Arg151Thr) variant linked to developmental delay and polyneuropathy compromises this chaperone activity to a degree comparable to a catalytically dead HPD-domain mutant [#17, #29]. This chaperone function underlies essential roles in cell survival, demonstrated by embryonic lethality of Tid1-null mice and Hsp70-binding-dependent rescue of cell death [#7], thymocyte survival via Bcl-2 [#13], and maintenance of mitochondrial membrane potential, mtDNA, and complex I stability through the J domain [#21]. In the cytosol, Tid1 directs clients toward degradation or relocalization: it counteracts HSP90 stabilization of EGFR to drive its ubiquitination and proteasomal degradation [#20], promotes ubiquitin-dependent turnover of Galectin-7 [#25], suppresses ErbB-2 expression and downstream ERK/BMK1 signaling [#6], and forms a complex with p53 to drive its mitochondrial translocation and transcription-independent apoptosis [#15, #16]. Tid1 is a J-domain-dependent negative regulator of NF-\\u03baB, binding the I\\u03baB/IKK complex to suppress IKK activity, stabilize I\\u03baB, and limit NF-\\u03baB-dependent IL-8 transcription and cell motility [#4, #8, #9]. It additionally modulates receptor tyrosine kinase signaling at Trk, c-Met, and the agrin-MuSK axis of the neuromuscular junction, where it is required for AChR clustering via Rac/Rho GTPase activation [#11, #18, #14], and when overexpressed drives Drp1-dependent mitochondrial fission [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that TID1 encodes two mitochondrial Hsp70-binding isoforms with opposing, J-domain-dependent effects on apoptosis, defining the gene as a co-chaperone with isoform-specific regulatory output.\",\n      \"evidence\": \"Co-IP and overexpression of wild-type versus J-domain mutant isoforms with apoptosis assays\",\n      \"pmids\": [\"10411904\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the molecular clients whose folding/fate the isoforms control\", \"Mechanism of opposing isoform activity not resolved at substrate level\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed Tid1 binds active Trk-family and Jak2 kinases and the IFN-\\u03b3 receptor, positioning the co-chaperone as a modulator of receptor/cytokine signaling complexes.\",\n      \"evidence\": \"Yeast two-hybrid, endogenous Co-IP, chimeric kinase domain constructs, and transcriptional reporter assays\",\n      \"pmids\": [\"11679576\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Hsp70 recruitment is required for kinase modulation not established\", \"Functional consequence on IFN-\\u03b3 output mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined Tid1 as a J-domain-dependent suppressor of NF-\\u03baB by inhibiting IKK\\u03b2-mediated I\\u03baB phosphorylation, prolonging I\\u03baB half-life.\",\n      \"evidence\": \"Kinase assays, NF-\\u03baB reporter assays, I\\u03baB stability assays, and J-domain mutant constructs\",\n      \"pmids\": [\"11927590\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the J domain mechanistically suppresses IKK activity not resolved\", \"Did not identify the chaperone client within the IKK complex\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated that Tid1's Hsp70 interaction is essential for organismal and cellular survival, anchoring the chaperone function to viability.\",\n      \"evidence\": \"Conditional knockout mice with embryonic lethality and cell-death rescue using wild-type versus J-domain mutant constructs\",\n      \"pmids\": [\"14993262\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The specific survival-critical clients were not identified\", \"Tissue-level requirements beyond MEFs not dissected here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Extended the NF-\\u03baB model by showing direct association with the I\\u03baB/IKK complex and linked Tid1 loss to NF-\\u03baB-driven IL-8 transcription and cancer cell motility, and established a survival role in thymocytes via Bcl-2.\",\n      \"evidence\": \"Direct binding and IKK activity assays, siRNA knockdown with promoter mutation and neutralizing antibody, plus T-cell conditional KO with Bcl-2 transgenic rescue\",\n      \"pmids\": [\"15601829\", \"16204048\", \"15879105\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanistic basis for cytoplasmic retention of I\\u03baB by Tid1 not fully defined\", \"Connection between mitochondrial and cytosolic functions left open\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Identified RTK and developmental signaling clients (Trk, ErbB-2, HIF-1\\u03b1/pVHL), showing Tid1 can both promote neurite outgrowth and suppress oncogenic receptor signaling and angiogenesis.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP in primary neurons with phosphorylation mapping, domain mutants, stability and angiogenesis assays\",\n      \"pmids\": [\"15753086\", \"15520177\", \"15805242\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Context-dependence of pro- versus anti-signaling outcomes not unified\", \"Direct enzymatic role of the J domain in client degradation not shown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Resolved the isoform divergence mechanism: a unique Tid1-L C-terminal domain mediates cytosolic Hsc70/STAT binding and prolonged residency, while both isoforms localize to mitochondrial nucleoids and functionally substitute for yeast Mdj1p.\",\n      \"evidence\": \"Subcellular fractionation, FRAP imaging, Co-IP, yeast complementation, domain deletion, and pulse-chase stability assays\",\n      \"pmids\": [\"16531398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of nucleoid localization not mechanistically tied to a phenotype here\", \"How cytosolic residency dictates client selection not fully resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed Tid1 forms a p53 complex and drives transcription-independent mitochondrial apoptosis, requiring both the mitochondrial targeting sequence and J domain.\",\n      \"evidence\": \"Co-IP, fractionation, siRNA and overexpression with domain deletion mutants, and apoptosis assays; direct binding confirmed by far-western with domain mapping\",\n      \"pmids\": [\"19935715\", \"21311096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the J domain couples p53 to the mitochondrial import machinery not detailed\", \"Relationship to Hsp70-dependent disaggregation activity unresolved\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided the biochemical core: reconstituted ATP-dependent disaggregation by mortalin with either Tid1 isoform plus Mge1, defining the canonical chaperone activity, while a separate study placed Tid1-S as a c-Met activator.\",\n      \"evidence\": \"In vitro reconstitution with purified mortalin, Tid1-L/S, and Mge1; Co-IP and kinase/migration assays for c-Met\",\n      \"pmids\": [\"21811887\", \"21242965\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Substrate spectrum of the disaggregase in vivo not mapped\", \"How the same J-domain activity yields opposite signaling outcomes across receptors unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Established a degradation-directing role: Tid1-L engages EGFR/HSP70/HSP90 to counteract HSP90 stabilization, driving EGFR ubiquitination and proteasomal turnover, with a later study showing Tid1-S instead routes EGFR into mitochondria.\",\n      \"evidence\": \"Co-IP with domain mapping, ubiquitination assays, knockdown/overexpression, xenografts; and subcellular fractionation with DnaJ mutants for mitochondrial transport\",\n      \"pmids\": [\"23698466\", \"28714950\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants selecting degradation versus mitochondrial import of EGFR not defined\", \"Whether the two fates are mutually exclusive within a cell unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected Tid1 chaperone activity to mitochondrial dynamics, showing dysregulation triggers Drp1-dependent fission via a specific J-domain ATPase-coupling residue.\",\n      \"evidence\": \"Overexpression, knockdown, H121Q point mutant, live-cell imaging, and Drp1-KO rescue with family-member specificity controls\",\n      \"pmids\": [\"22595283\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether fission reflects a physiological or stress-overexpression response not settled\", \"Link between fission and disaggregation activity not established\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the bioenergetic role: Tid1 J-domain activity maintains membrane potential homogeneity, mtDNA, and complex I assembly, preventing complex I aggregation.\",\n      \"evidence\": \"RNAi with J-domain rescue, membrane potential and oxygen consumption assays, mtDNA quantification, and blue-native PAGE for complex I\",\n      \"pmids\": [\"24492964\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether complex I subunits are direct disaggregase substrates not proven\", \"Mechanism linking aggregation to focal \\u0394\\u03c8 accumulation incomplete\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Broadened the degradation-directing repertoire to Galectin-7 and (with lower confidence) G\\u03b1s via CHIP, reinforcing Tid1 as a routing factor for client ubiquitination.\",\n      \"evidence\": \"Affinity chromatography/MS, Co-IP, ubiquitination assays, localization imaging, and tissue-specific KO; CHIP/G\\u03b1s study by Co-IP and overexpression only\",\n      \"pmids\": [\"30083263\", \"30443176\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"G\\u03b1s/CHIP findings rest on Co-IP and overexpression without domain mutagenesis\", \"Whether Galectin-7 turnover requires Hsp70 cooperation not tested\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the specific cytosolic Hsp70 partners (HSPA1A, HSPA8), reinforced J-domain-dependent NF-\\u03baB control in immunity, and revealed antiviral roles routing viral proteins to lysosomal degradation while restoring IFN signaling.\",\n      \"evidence\": \"Co-IP with HSP70 inhibition and Drosophila genetic validation for NF-\\u03baB; Co-IP, domain mapping, KO cells, LC3 interaction, and IFN-\\u03b2/IRF3 assays for FMDV VP1; in vitro import/disaggregation assays for the R151T disease variant\",\n      \"pmids\": [\"31005254\", \"30996089\", \"30770860\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How a single co-chaperone toggles between proteasomal and lysosomal client routing unresolved\", \"Disease variant phenotype not yet mechanistically tied to a specific tissue substrate\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided structural insight, with NMR showing the Tid1 J-domain/GF-motif resembles the DNAJB subfamily, implying a DNAJB-like mode of allosteric mortalin regulation.\",\n      \"evidence\": \"Solution NMR spectroscopy of the J-domain and GF-motif with sequence analysis\",\n      \"pmids\": [\"35651334\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional mutagenesis tied the DNAJB-like conformation to activity\", \"Full-length structure and client-bound states not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How a single co-chaperone selects between disaggregation, proteasomal degradation, lysosomal targeting, and mitochondrial import of its many clients, and how isoform identity and cytosolic versus mitochondrial residency dictate this choice, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model links client routing decisions to isoform or compartment\", \"Comprehensive in vivo substrate catalog of the mortalin/Tid1 disaggregase is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 7, 17, 20]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [17, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 8, 19]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [15, 16, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 12, 21, 24]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [12, 8, 20]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [17, 20, 25]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 13, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [4, 8, 11, 18, 14]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [19, 21]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [28, 27]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [22, 27]}\n    ],\n    \"complexes\": [\n      \"mortalin (mtHsp70)/Tid1/Mge1 disaggregase\",\n      \"mitochondrial nucleoid\",\n      \"IKK/I\\u03baB/NF-\\u03baB complex\",\n      \"Beclin1-PI3K class III complex\"\n    ],\n    \"partners\": [\n      \"HSPA9\",\n      \"HSPA8\",\n      \"HSPA1A\",\n      \"TP53\",\n      \"EGFR\",\n      \"IKBKB\",\n      \"MUSK\",\n      \"VHL\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}