{"gene":"ATOX1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":1997,"finding":"HAH1 (ATOX1) encodes a 68-amino acid copper-binding protein that functionally complements yeast ATX1 deletion: expression in atx1Δ yeast restores copper incorporation into the multicopper oxidase Fet3p and rescues high-affinity iron uptake, establishing its role as a copper chaperone for the secretory pathway.","method":"Yeast complementation assay (atx1Δ growth rescue, Fet3p copper incorporation)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional complementation in two independent yeast deletion strains with defined molecular readouts, replicated across multiple assays in a foundational study","pmids":["9083055"],"is_preprint":false},{"year":1998,"finding":"HAH1 binds Cu(I) via two conserved cysteine residues (Cys12, Cys15) in the MTCXGC motif; site-directed mutagenesis of these cysteines abrogates copper trafficking to the secretory compartment in vivo. In contrast, mutation of conserved C-terminal lysine residues eliminates antioxidant function but not copper trafficking, demonstrating that distinct residues mediate the two functions.","method":"In vitro Cu(I) binding assay with recombinant protein; site-directed mutagenesis; yeast complementation (Fet3p copper incorporation; sod1Δ antioxidant assay)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution plus mutagenesis plus in vivo functional readouts, multiple orthogonal methods in one rigorous study","pmids":["9430722"],"is_preprint":false},{"year":1999,"finding":"HAH1 directly interacts with the Wilson disease protein (ATP7B) and the Menkes protein (ATP7A) in a copper-dependent manner; interaction requires the cysteine copper ligands in the HAH1 amino terminus. Disease-associated mutations in the N-terminus of ATP7B markedly diminish HAH1 interaction, suggesting impaired copper delivery underlies Wilson disease in those patients.","method":"GST pulldown with recombinant GST-HAH1 fusion; co-immunoprecipitation from human cell lysates; site-directed mutagenesis of cysteine ligands and disease-associated ATP7B mutations","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus GST pulldown plus mutagenesis, multiple orthogonal methods, foundational study widely replicated","pmids":["10557326"],"is_preprint":false},{"year":2001,"finding":"Atox1-deficient (Atox1−/−) mouse cells accumulate high levels of intracellular copper due to impaired cellular copper efflux, directly demonstrating Atox1's role in trafficking copper to the secretory pathway for export.","method":"Genetic knockout mouse model; metabolic copper studies in Atox1−/− vs Atox1+/+ cells; measurement of intracellular copper accumulation and efflux","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined cellular phenotype (copper efflux defect), replicated in subsequent studies","pmids":["11391006"],"is_preprint":false},{"year":2002,"finding":"Atox1 transfers copper to the purified N-terminal domain of the Wilson disease protein (N-WNDP) in a dose-dependent and saturable manner (up to six copper atoms); incubation of copper-Atox1 with full-length WNDP stimulates its ATPase catalytic activity. Apo-Atox1 can remove copper from metalated N-WNDP, down-regulating WNDP activity, demonstrating bidirectional copper regulation.","method":"In vitro copper transfer assay with recombinant proteins; ATPase activity measurements; copper occupancy analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution of copper transfer with defined enzymatic readout, multiple parameters measured","pmids":["12029094"],"is_preprint":false},{"year":2003,"finding":"Atox1 is essential for copper-mediated intracellular trafficking of the Menkes ATPase (ATP7A): in Atox1-deficient cells, copper-stimulated translocation of the Menkes ATPase from the Golgi compartment is significantly impaired compared to wild-type cells, even at equivalent intracellular copper content.","method":"Quantitative confocal immunofluorescence time-course in Atox1+/+ vs Atox1−/− immortalized fibroblasts; copper dose-response trafficking assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout cell lines with direct localization and trafficking readout, time- and dose-dependent analysis","pmids":["12538877"],"is_preprint":false},{"year":2003,"finding":"X-ray absorption spectroscopy (XAS) of HAH1 reconstituted with Cu(I) reveals a linear bis-cysteinate coordination geometry (two Cu-S interactions at 2.16 Å); exogenous thiols (GSH, DTT) and phosphines can form three-coordinate adducts with Cu(I)-HAH1, with differing affinities.","method":"X-ray absorption spectroscopy (EXAFS/XANES); Cu(I) reconstitution; titration with exogenous ligands","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct structural determination by XAS with chemical validation; single lab but rigorous in vitro reconstitution","pmids":["12686548"],"is_preprint":false},{"year":2003,"finding":"Atox1 interacts with all six metal-binding sites (MBS1–6) of the Menkes ATPase (MNK) in a copper-dependent manner; copper-dependent binding requires intact CXXC cysteine motifs. Binding constants for chaperone–MBS interactions are in the 10−5–10−6 M range and are non-cooperative.","method":"Yeast two-hybrid assay; surface plasmon resonance (SPR) kinetic analysis; site-directed mutagenesis of CXXC motifs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — two independent methods (Y2H and SPR) with quantitative kinetics; single lab","pmids":["12679332"],"is_preprint":false},{"year":2004,"finding":"The N-terminal metal-binding site 2 (MBS2) of the Wilson disease protein plays a preferential role in copper transfer from Atox1: copper transfer from Atox1 selectively protects MBS2 cysteines against labeling, site-directed mutagenesis of MBS2 eliminates ATPase stimulation by copper-Atox1 but not by free copper, and MBS2 retains copper better than Atox1 (demonstrated by chelator competition), facilitating directional transfer.","method":"Cysteine-directed probe labeling; site-directed mutagenesis; ATPase activity assay; copper chelator competition; X-ray absorption spectroscopy of isolated MBS2","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal methods (mutagenesis, labeling protection, XAS, enzymatic assay) in a single rigorous study","pmids":["14754885"],"is_preprint":false},{"year":2004,"finding":"NMR solution structure of apo- and Cu(I)-loaded HAH1 shows minor structural rearrangements upon copper binding; Cu(I) is confirmed to be two-coordinate in the holoprotein. The lower tendency of HAH1 versus orthologs to switch from two- to three-coordination may be mechanistically relevant for copper transfer.","method":"NMR solution structure determination; comparison of apo vs holo forms","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structure with functional validation; single lab, consistent with X-ray data from other studies","pmids":["15476398"],"is_preprint":false},{"year":2004,"finding":"HAH1 forms copper-dependent homodimers (apparent Kd ~6 µM) as measured by solid-phase assay and Biacore; copper-loaded HAH1 interacts independently with each of the six individual metal-binding domains of the Menkes ATPase; homodimerization was confirmed in living cells by FRET.","method":"Solid-phase binding assay; Biacore surface plasmon resonance; FRET in living cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two biophysical methods plus in-cell FRET; single lab, consistent with crystal structure data","pmids":["15530404"],"is_preprint":false},{"year":2006,"finding":"NMR titration of the Wilson disease protein domains 5–6 (WLN5-6) with Cu(I)-HAH1 reveals no complex formation and no copper exchange, whereas HAH1 forms a fast-exchange adduct with domain 4 (WLN4) and domain 2 (WLN2). Cu(I) is transferred from WLN4 to WLN5-6 (first to WLN6, then to WLN5) without forming a detectable adduct, suggesting WLN4 and WLN2 are the direct acceptors from HAH1 that route copper to WLN5-6.","method":"NMR titration; 15N relaxation measurements; solution structure of apoWLN5-6","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR-based structural and transfer analysis with multiple domain constructs; rigorous single study","pmids":["16571664"],"is_preprint":false},{"year":2008,"finding":"Atox1 functions as a copper-dependent transcription factor: copper stimulates Atox1 nuclear translocation (via C-terminal KKTGK motif and N-terminal copper-binding sites), binding to a cis-element in the cyclin D1 (Ccnd1) promoter (shown by EMSA and ChIP), and transactivation of cyclin D1 expression, driving cell proliferation. Atox1−/− MEFs fail to proliferate in response to copper; re-expression of nuclear-targeted Atox1 rescues this defect.","method":"Promoter analysis; EMSA; ChIP assay; Gal4-fusion transactivation assay; Atox1−/− MEF rescue experiments; fluorescence microscopy for nuclear translocation; cell cycle analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, transactivation, genetic rescue), copper-dependence established, consistent across cell types","pmids":["18245776"],"is_preprint":false},{"year":2008,"finding":"HAH1 forms a ~70% complex (fast exchange) with metal-binding domain 4 of ATP7B but not with domains 5–6; both domains 3 and 4 can be loaded with Cu(I) by HAH1, while domains 3 and 4 tend to aggregate in a concentration-dependent manner via nonspecific intermolecular interactions.","method":"NMR solution structure of WLN3-4; NMR interaction experiments with Cu(I)-HAH1; 15N relaxation data","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR structural study with interaction mapping; single lab, consistent with domain 4 preference shown in other studies","pmids":["18558714"],"is_preprint":false},{"year":2008,"finding":"Conserved residues Met10 and Lys60 modulate Cu(I) release from Atox1: both Met10Ala and Lys60Ala mutants lose Cu(I) more readily than wild-type due to more rapid displacement from the Atox1-Cu-BCA intermediate, suggesting these residues control the kinetics of copper delivery to target proteins.","method":"Cu(I) displacement kinetics using bicinchoninic acid (BCA) as metal acceptor; stopped-flow spectroscopy; point mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro kinetic reconstitution with mutagenesis, defined mechanistic model; single lab","pmids":["18685091"],"is_preprint":false},{"year":2009,"finding":"Atox1 forms a stable Cu-dependent heterocomplex with the fourth metal-binding domain of Wilson disease protein (WD4); Lys60 is essential for adduct formation and copper transfer, while Met10 and Thr11 are dispensable for adduct formation. Electrostatic interaction mediated by Lys60 is the key energetic contributor to heterocomplex stability.","method":"Near-UV circular dichroism; gel filtration; molecular dynamics simulations; point-mutated Atox1 variants","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple biophysical methods plus simulations plus mutagenesis in a single study","pmids":["19863064"],"is_preprint":false},{"year":2009,"finding":"NMR study of the entire six-domain N-terminal tail of ATP7B shows that all six metal-binding domains are metallated by Cu(I)-HAH1, with domains 1, 2, and 4 forming adducts with HAH1. This is distinct from ATP7A, where only two domains form such adducts, indicating different mechanisms of copper delivery between the two ATPases.","method":"NMR solution spectroscopy; interaction experiments with Cu(I)-HAH1 and the full-length N-terminal tail construct","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — NMR with defined protein construct; single lab, direct comparison to ATP7A","pmids":["19181666"],"is_preprint":false},{"year":2009,"finding":"In Atox1-deficient fibroblasts, synchrotron X-ray fluorescence imaging reveals that the characteristic perinuclear copper distribution of wild-type cells is replaced by a diffuse, unstructured distribution throughout the cell, without changes in zinc or iron distribution, confirming Atox1 as a key organizer of subcellular copper localization.","method":"Quantitative synchrotron X-ray fluorescence (SXRF) imaging of Atox1+/+ vs Atox1−/− mouse fibroblasts","journal":"Journal of biological inorganic chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct elemental imaging with genetic control; single lab, single method but highly specific readout","pmids":["19865834"],"is_preprint":false},{"year":2011,"finding":"Atox1 binds cisplatin at its metal-binding site in both the apo and Cu-loaded forms; the resulting Atox1-cisplatin adduct is unstable over time and the protein unfolds and aggregates in a cisplatin-specific manner. In-cell NMR shows that a {Pt(NH3)2}-Atox1 adduct forms intracellularly, leading to protein dimerization and loss of ammine ligands over time. Overexpression of Atox1 in E. coli reduces DNA platination.","method":"Solution NMR; in-cell NMR spectroscopy; circular dichroism; cell filamentation assay","journal":"Journal of the American Chemical Society","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in-cell and solution NMR with orthogonal functional readout; rigorous structural characterization","pmids":["21981264"],"is_preprint":false},{"year":2011,"finding":"Cu(I) binding affinities of Atox1 and related metallochaperone proteins (including ATP7B domains 5 and 6) were unified using validated Cu(I) probes (bicinchoninic acid and bathocuproine disulfonate); Atox1-type proteins bind Cu(I) with sub-femtomolar affinities (KD values), consistent with tight buffering of labile Cu+ in cells.","method":"Competitive and non-competitive Cu(I) binding assays with four validated spectroscopic probes; quantitative affinity determination","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro thermodynamic measurements using multiple validated probes; comprehensive analysis","pmids":["21258123"],"is_preprint":false},{"year":2011,"finding":"Cisplatin binds to the metal-binding site of Atox1 in vitro regardless of copper occupancy; the cisplatin-bound protein is destabilized and unfolds/aggregates over time. The unfolding effect is specific to Atox1 and not observed for two unrelated cisplatin-binding proteins.","method":"Near-UV and far-UV circular dichroism; NMR spectroscopy; in vitro protein stability assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple spectroscopic methods, specificity controls, single lab","pmids":["21482801"],"is_preprint":false},{"year":2013,"finding":"Atox1 transfers platinum (cisplatin) to the metal-binding domain 2 (MBD2) of ATP7B, producing the same Pt-cysteine adduct as direct cisplatin binding, suggesting that Pt can travel along the copper transport pathway as a mechanism of cisplatin detoxification/delivery.","method":"X-ray absorption spectroscopy; in vitro Pt transfer assays from Atox1 to MBD2","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — XAS structural characterization of platinum adduct plus transfer assay; single lab","pmids":["23751120"],"is_preprint":false},{"year":2013,"finding":"Cu(I) and glutathione form large polymeric clusters that can transfer copper to Atox1; under physiological redox conditions, both copper and cisplatin bind simultaneously to Atox1 through copper-sulfur-platinum bridges involving both Cys12 and Cys15.","method":"Mass spectrometry; X-ray absorption spectroscopy; redox-controlled in vitro binding assays","journal":"Biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — XAS plus MS structural analysis; single lab, physiologically relevant redox conditions","pmids":["28549213"],"is_preprint":false},{"year":2013,"finding":"Both Cys12 and Cys15 of Atox1 are required to form a simultaneous Cu-Pt di-metal complex with cisplatin; Cys41 is not involved. Atox1 can deliver cisplatin to ATP7B domain 4 (WD4) in vitro, providing evidence for a drug detoxification mechanism via the copper export pathway.","method":"Near-UV CD spectroscopy; gel filtration; strategic Atox1 point mutants; in vitro Pt transfer to WD4","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods (CD, gel filtration, mutagenesis, transfer assay); single lab","pmids":["23936210"],"is_preprint":false},{"year":2014,"finding":"Human glutaredoxin 1 (hGrx1) catalyzes the interchange between dithiol and disulfide forms of the Cys12-Cys15 motif in Atox1; the direction of catalysis is regulated by the GSSG/2GSH ratio and availability of Cu(I). hGrx1 binds Cu(I) with femtomolar affinity, and the reduction potential of Atox1's CXXC motif (−188 mV) is more negative than that of hGrx1 (−118 mV), mechanistically linking copper homeostasis to redox regulation.","method":"In vitro redox catalysis assays; Cu(I) affinity measurements; reduction potential determination; mutagenesis of active-site cysteines","journal":"Metallomics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of enzymatic catalysis, quantitative thermodynamic parameters, mutagenesis; single lab","pmids":["24522867"],"is_preprint":false},{"year":2015,"finding":"The C-terminal cytoplasmic tail of Ctr1 (13-residue HCH-containing peptide) binds Cu(I) with KD ~10−14 M; Atox1 acquires Cu from the Cu-loaded Ctr1 C-terminal peptide as demonstrated by NMR at the residue level. The two proteins do not interact in the absence of Cu, indicating that Cu binding to the Ctr1 tail regulates release to downstream chaperones.","method":"NMR spectroscopy; bicinchoninic acid competition assays; site-directed mutation of HCH motif","journal":"Biophysical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — residue-level NMR plus quantitative affinity measurements; mechanistic model well-supported","pmids":["26745413"],"is_preprint":false},{"year":2015,"finding":"The cytoplasmic Cu chaperones Atox1 and CCS (domain 1) can exchange Cu ions in vitro; Cu transfer occurs in both directions, and mutation of the Cu-binding cysteine in Atox1 eliminates Cu transfer from CCS1, demonstrating that exchange involves the metal-binding sites.","method":"Size-exclusion chromatography with 254/280 nm ratio as Cu-loading indicator; NMR; full-length CCS transfer experiments; Atox1 Cys mutant","journal":"Biometals","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two methods (SEC and NMR) with mutagenesis control; single lab","pmids":["25673218"],"is_preprint":false},{"year":2016,"finding":"Atox1 accumulates at lamellipodia edges of migrating breast cancer cells; siRNA-mediated silencing of Atox1 reduces breast cancer cell migration (wound healing assay), suggesting a role in cell motility linked to copper chaperone function.","method":"Immunostaining and fluorescence microscopy; wound healing migration assay; siRNA knockdown","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization plus loss-of-function migration phenotype; single lab, two methods","pmids":["28027931"],"is_preprint":false},{"year":2017,"finding":"The copper chaperone Atox1 regulates ATP7B catalytic activity by modulating domain dynamics of MBD1-3: copper transfer from Atox1 to ATP7B decreases domain interactions within MBD1-3 and increases individual domain mobility (measured by SAXS and NMR), activating ATP hydrolysis. The N-terminal segment of MBD1-3 physically interacts with the nucleotide-binding domain of ATP7B, coupling copper binding to ATP hydrolysis.","method":"Small-angle X-ray scattering (SAXS); solution NMR; ATPase activity assays; apo-Atox1 and Cu-Atox1 comparative studies","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — SAXS structural analysis plus NMR dynamics plus enzymatic assay; multiple orthogonal methods in one study","pmids":["28900031"],"is_preprint":false},{"year":2017,"finding":"Atox1 contains positively charged surface lysine residues that mediate association with negatively charged lipid membranes; loss of these residues lowers copper loading efficiency in vivo, suggesting the membrane bilayer acts as a scaffold facilitating copper loading of Atox1.","method":"Lipid binding assays; in vivo copper loading assays with Lys mutants; membrane association experiments","journal":"The Journal of membrane biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional mutagenesis with in vivo copper loading readout; single lab","pmids":["24036897"],"is_preprint":false},{"year":2017,"finding":"Atox1 can function as a transcription factor for SOD3: in TPA-differentiated THP-1 cells, Atox1 undergoes copper-dependent nuclear translocation, binds the SOD3 promoter (demonstrated by ChIP), and overexpression/knockdown of Atox1 enhances/suppresses TPA-induced SOD3 expression.","method":"Nuclear translocation assay; ChIP assay; Atox1 overexpression and knockdown; quantitative RT-PCR and Western blot for SOD3","journal":"Biometals","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus genetic gain/loss-of-function; single lab, single cell-type context","pmids":["29168020"],"is_preprint":false},{"year":2019,"finding":"Atox1 interacts with α-synuclein in living cells (proximity ligation assay) and in vitro (NMR); the interaction interface in α-synuclein involves the N-terminal region up to Gln24, while in Atox1, residues around the copper-binding cysteines (positions 11–16) are primarily involved. Atox1 inhibits amyloid formation of both non-acetylated and N-terminally acetylated α-synuclein in vitro.","method":"Solution NMR spectroscopy with isotopically labeled proteins; in-cell proximity ligation assay; in vitro amyloid formation assays","journal":"ACS chemical neuroscience","confidence":"High","confidence_rationale":"Tier 2 / Moderate — residue-level NMR interaction mapping plus in-cell proximity ligation; two orthogonal methods, single lab","pmids":["31600047"],"is_preprint":false},{"year":2020,"finding":"Atox1 is required for breast cancer cell migration velocity and directionality (tracked at single-cell level); silencing Atox1 also reduces copper transporter ATP7A expression effects and decreases LOX (lysyl oxidase) activity, placing Atox1 in the ATP7A–LOX axis for copper-mediated cancer cell migration.","method":"Video microscopy single-cell tracking (~hundreds of cells per condition); siRNA knockdown; in-cell proximity ligation assay for Atox1-ATP7A-LOX proximity; LOX activity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — large-scale quantitative single-cell tracking with genetic knockdown plus proximity ligation and enzymatic activity assay; multiple orthogonal methods","pmids":["31932435"],"is_preprint":false},{"year":2020,"finding":"EPR and computational analysis reveals that Cu(I) binding in Atox1 involves Cys12 as the primary Cu(I)-binding residue while Cys15 is important for Atox1 dimerization; Lys60 electrostatically stabilizes the Cu(I)-Atox1 dimer. Atox1 interacts with Ctr1 as a dimer but transfers copper to ATP7A/B as a monomer.","method":"Continuous wave and pulsed EPR spectroscopy; QM/MM molecular dynamics simulations; site-directed spin labeling","journal":"The journal of physical chemistry. B","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — EPR with computational validation; single lab, consistent with prior structural data","pmids":["32396355"],"is_preprint":false},{"year":2020,"finding":"EPR spectroscopy of Cu(I)-bound Atox1 with ATP7B metal-binding domains shows that Cu(I) is most likely transferred from Atox1 monomer to MBD1 and MBD4 of ATP7B; MBD1-3 and MBD4-6 act as two independent functional units, and other MBDs mediate intramolecular copper routing.","method":"CW and pulsed EPR spectroscopy in solution; spin-labeled protein constructs","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biophysical measurement of Cu(I) transfer with defined domain constructs; single lab","pmids":["32748830"],"is_preprint":false},{"year":2021,"finding":"APEX2-based proximity labeling of Atox1 identified CRIP2 as a nuclear copper-binding protein that interacts with Atox1; Atox1 transfers copper to CRIP2, inducing a conformational change that promotes CRIP2 ubiquitin-mediated proteasomal degradation. CRIP2 degradation (or depletion) elevates ROS and activates autophagy in cancer cells.","method":"APEX2 proximity labeling combined with mass spectrometry; co-immunoprecipitation; in vitro copper transfer; secondary structure analysis; siRNA knockdown; autophagy and ROS assays","journal":"Angewandte Chemie","confidence":"High","confidence_rationale":"Tier 2 / Moderate — proximity labeling/MS for interaction discovery, confirmed by Co-IP and in vitro transfer, functional validation by knockdown; multiple orthogonal methods","pmids":["34550632"],"is_preprint":false},{"year":2022,"finding":"ATOX1 promotes copper-dependent transcription of MDC1 (a double-strand DNA damage repair protein): after genotoxic stress, ATOX1 translocates to the nucleus and binds the MDC1 promoter in a copper-dependent manner, enhancing DNA damage repair. Knockout or blockade of ATOX1 sensitizes tumors to gemcitabine in mouse models.","method":"ChIP assay; promoter reporter assay; ATOX1 knockout cell lines and mouse xenograft models; Western blot for MDC1; genotoxic drug sensitivity assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP confirms direct promoter binding, genetic loss-of-function in vivo; single lab","pmids":["35315340"],"is_preprint":false},{"year":2022,"finding":"Memo1 binds two Cu(I) ions per protein, shields them from ROS generation, and exchanges Cu(I) with the copper chaperone Atox1 in vitro; spatial proximity between Memo1 and Atox1 is confirmed in breast cancer cells by proximity ligation assay, suggesting Memo1 may shuttle Cu to Atox1 for delivery to the secretory pathway.","method":"Multiple biophysical methods (spectroscopy) for Cu binding; in vitro Cu exchange assay; proximity ligation assay in breast cancer cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biophysical methods plus in-cell proximity ligation; single lab","pmids":["36067318"],"is_preprint":false},{"year":2022,"finding":"Crystal structure of Atox1 loaded with Zn2+ shows the Zn ion bridging the CXXC motifs of two Atox1 molecules in a homodimer with tetrahedral coordination; EDTA soaking causes only limited Zn removal, suggesting potential involvement of Atox1 in zinc metabolism in addition to copper.","method":"X-ray crystallography; anomalous diffraction near Zn K-edge for metal identity; EDTA soaking experiments","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — crystal structure with identity confirmation; single study, functional implications not fully established","pmids":["36291703"],"is_preprint":false},{"year":2024,"finding":"Atox1 binds DJ-1 in a copper-dependent manner (copper-binding motif mutation or free copper sequestration reduces the interaction); DJ-1 mediates Atox1's antioxidant capacity, as DJ-1 knockdown impairs Atox1-mediated protection against oxidative stress, and overexpression of DJ-1 fails to restore antioxidant function of copper-binding-deficient Atox1 mutants.","method":"Co-immunoprecipitation and mass spectrometry; site-directed Atox1 mutations; DJ-1 knockdown and overexpression; oxidative stress and mitochondrial function assays in HT-22 cells and mouse TBI model","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP/MS for interaction, mutagenesis for copper-dependence, genetic epistasis for functional relevance; single lab","pmids":["38640584"],"is_preprint":false}],"current_model":"ATOX1 (HAH1) is a small cytoplasmic copper chaperone that binds Cu(I) with sub-femtomolar affinity via a conserved Cys12-Cys15 (CXXC) motif, acquires Cu from the Ctr1 C-terminal tail, and delivers it—via direct, copper-dependent protein–protein interactions—to the N-terminal metal-binding domains of the copper-transporting P-type ATPases ATP7A (Menkes) and ATP7B (Wilson), preferentially engaging domain 4 first and thereby stimulating their catalytic activity and enabling copper-dependent Golgi trafficking; in addition, ATOX1 undergoes copper-stimulated nuclear translocation (requiring the C-terminal KKTGK motif) where it acts as a transcription factor that binds promoters of cyclin D1, SOD3, MDC1, and other targets to drive cell proliferation, DNA damage repair, and antioxidant responses, while its redox state is regulated by glutaredoxin 1 and the GSH/GSSG couple, linking copper homeostasis to cellular redox balance."},"narrative":{"mechanistic_narrative":"ATOX1 (HAH1) is a small cytosolic copper(I) chaperone that delivers copper to the secretory pathway and coordinates intracellular copper distribution [PMID:9083055, PMID:19865834]. It binds Cu(I) with sub-femtomolar affinity through a conserved Cys12-Cys15 (MTCXGC) motif in a near-linear bis-cysteinate geometry, and these cysteine ligands are obligatory for copper trafficking [PMID:9430722, PMID:12686548, PMID:21258123]. ATOX1 acquires copper from the Cu-loaded C-terminal cytoplasmic tail of the importer Ctr1 in a strictly copper-dependent manner [PMID:26745413] and delivers it through direct, copper-dependent protein-protein contacts to the N-terminal metal-binding domains of the copper-transporting P-type ATPases ATP7A (Menkes) and ATP7B (Wilson), preferentially engaging domain 4 to route copper to downstream domains and thereby stimulating ATPase catalytic activity by altering inter-domain dynamics [PMID:10557326, PMID:12029094, PMID:16571664, PMID:28900031]; disease-associated ATP7B N-terminal mutations weaken this interaction, linking impaired copper delivery to Wilson disease [PMID:10557326]. Genetic loss of Atox1 causes intracellular copper accumulation, an efflux defect, and failure of copper-stimulated trafficking of ATP7A out of the Golgi, with loss of the normal perinuclear copper distribution [PMID:11391006, PMID:12538877, PMID:19865834]. Beyond chaperone function, copper stimulates ATOX1 nuclear translocation via its C-terminal KKTGK motif, where it acts as a transcription factor binding the promoters of cyclin D1, SOD3, and MDC1 to drive proliferation, antioxidant responses, and DNA damage repair [PMID:18245776, PMID:29168020, PMID:35315340]. ATOX1 redox state is governed by glutaredoxin 1 and the GSH/GSSG couple, coupling copper handling to cellular redox balance [PMID:24522867], and the protein contributes to copper-dependent cancer cell migration through an ATP7A-LOX axis [PMID:28027931, PMID:31932435]. ATOX1 also binds platinum drugs such as cisplatin through the same cysteine motif and can shuttle platinum to ATP7B domains, implicating it in drug detoxification [PMID:21981264, PMID:23751120, PMID:23936210].","teleology":[{"year":1997,"claim":"Established that ATOX1 is a bona fide copper chaperone for the secretory pathway, resolving whether the human gene had conserved metallochaperone function.","evidence":"Yeast atx1Δ complementation restoring Fet3p copper incorporation and high-affinity iron uptake","pmids":["9083055"],"confidence":"High","gaps":["Did not identify the mammalian copper acceptor proteins","No structural basis for copper binding"]},{"year":1998,"claim":"Defined the molecular determinants of ATOX1's two functions, showing that the Cys12/Cys15 motif mediates copper trafficking while distinct C-terminal lysines mediate antioxidant activity.","evidence":"In vitro Cu(I) binding, site-directed mutagenesis, and yeast complementation (Fet3p and sod1Δ assays)","pmids":["9430722"],"confidence":"High","gaps":["Mechanism of antioxidant function not defined","Copper acceptor still unidentified"]},{"year":1999,"claim":"Identified the physiological copper acceptors by demonstrating copper-dependent direct interaction with the Menkes and Wilson disease ATPases, linking ATOX1 to human copper disorders.","evidence":"GST pulldown and co-immunoprecipitation from human cells with mutagenesis of cysteine ligands and disease-associated ATP7B mutations","pmids":["10557326"],"confidence":"High","gaps":["Did not establish directionality or kinetics of transfer","Which specific ATPase domains accept copper unresolved"]},{"year":2001,"claim":"Provided in vivo proof that ATOX1 is required for cellular copper efflux, showing its loss causes intracellular copper accumulation.","evidence":"Atox1-knockout mouse cells with metabolic copper efflux and accumulation measurements","pmids":["11391006"],"confidence":"High","gaps":["Did not separate trafficking from transcriptional contributions to phenotype"]},{"year":2002,"claim":"Reconstituted directional copper transfer to ATP7B and demonstrated bidirectional regulation of ATPase activity, defining ATOX1 as a functional activator of the pump.","evidence":"In vitro copper transfer to N-WNDP, ATPase activity assays, and apo-Atox1 copper removal experiments","pmids":["12029094"],"confidence":"High","gaps":["Domain-level acceptor preference not yet mapped","Coupling to ATP hydrolysis not structurally explained"]},{"year":2003,"claim":"Showed ATOX1 is essential for copper-stimulated Golgi-to-vesicle trafficking of ATP7A, distinguishing trafficking control from bulk copper content.","evidence":"Confocal trafficking time-course in Atox1+/+ vs Atox1−/− fibroblasts at matched copper levels","pmids":["12538877"],"confidence":"High","gaps":["Did not address ATP7B trafficking dependence"]},{"year":2003,"claim":"Determined the Cu(I) coordination geometry and mapped chaperone binding across all six ATPase metal-binding sites, establishing the structural basis of transfer.","evidence":"XAS of Cu(I)-HAH1; yeast two-hybrid and SPR kinetics against MNK MBS1-6 with CXXC mutants","pmids":["12686548","12679332"],"confidence":"High","gaps":["Did not resolve which MBS is the kinetically preferred acceptor","Functional consequence of binding all six sites unclear"]},{"year":2004,"claim":"Refined the transfer mechanism by identifying MBS2 of ATP7B as a preferential, copper-retaining acceptor and resolving the apo/holo conformational change driving transfer.","evidence":"Cysteine-protection labeling, MBS2 mutagenesis, chelator competition, XAS, and NMR of apo/Cu(I)-HAH1","pmids":["14754885","15476398"],"confidence":"High","gaps":["Reconciliation of MBS2 preference with later domain-4 preference unresolved","In-cell relevance of single-domain preference not tested"]},{"year":2004,"claim":"Demonstrated copper-dependent ATOX1 homodimerization in vitro and in living cells, adding an oligomeric dimension to the transfer mechanism.","evidence":"Solid-phase binding, Biacore, and FRET in living cells","pmids":["15530404"],"confidence":"Medium","gaps":["Functional role of dimer vs monomer in transfer not resolved here"]},{"year":2006,"claim":"Mapped the intramolecular copper routing within ATP7B, showing domains 4 and 2 are the direct HAH1 acceptors that relay copper to domains 5-6.","evidence":"NMR titration and relaxation with WLN4, WLN2, and WLN5-6 domain constructs","pmids":["16571664"],"confidence":"High","gaps":["Did not establish which domain transfer is rate-limiting in vivo"]},{"year":2008,"claim":"Discovered a non-chaperone role for ATOX1 as a copper-dependent transcription factor driving cyclin D1 and cell proliferation, expanding its biology beyond metal delivery.","evidence":"EMSA, ChIP, Gal4 transactivation, nuclear translocation imaging, and Atox1−/− MEF rescue","pmids":["18245776"],"confidence":"High","gaps":["Full repertoire of transcriptional targets unknown","Mechanism of promoter recognition by a small chaperone unclear"]},{"year":2008,"claim":"Defined kinetic control of copper release and confirmed ATP7B domain-4 preference, identifying residues that tune delivery rate.","evidence":"Stopped-flow Cu(I) displacement kinetics with Met10/Lys60 mutants; NMR of WLN3-4 interaction","pmids":["18685091","18558714"],"confidence":"High","gaps":["In-cell impact of Met10/Lys60 mutations not tested"]},{"year":2009,"claim":"Established Lys60-driven electrostatics as the key energetic contributor to heterocomplex stability and reconciled ATPase-specific delivery modes.","evidence":"CD, gel filtration, and MD with Atox1 mutants for WD4; whole six-domain ATP7B NMR vs ATP7A; SXRF copper imaging of knockout cells","pmids":["19863064","19181666","19865834"],"confidence":"High","gaps":["Why ATP7A and ATP7B use different numbers of acceptor domains is unexplained"]},{"year":2011,"claim":"Quantified ATOX1's sub-femtomolar Cu(I) affinity and uncovered cisplatin binding/destabilization, linking the protein to platinum-drug handling.","evidence":"Validated Cu(I) probe affinity measurements; solution and in-cell NMR and CD of cisplatin adducts","pmids":["21258123","21981264","21482801"],"confidence":"High","gaps":["Physiological significance of cisplatin destabilization in tumors not established here"]},{"year":2013,"claim":"Showed ATOX1 can carry platinum along the copper export pathway and that copper and platinum can bind simultaneously, supporting a drug-detoxification model.","evidence":"XAS and in vitro Pt transfer to ATP7B MBD2/WD4; MS and XAS of Cu-S-Pt bridges with both cysteines","pmids":["23751120","23936210","28549213"],"confidence":"Medium","gaps":["In vivo contribution to cisplatin resistance not quantified","Single-lab biophysical observations"]},{"year":2014,"claim":"Connected copper homeostasis to redox regulation by showing glutaredoxin 1 controls the redox state of the ATOX1 CXXC motif via the GSH/GSSG couple.","evidence":"In vitro redox catalysis, Cu(I) affinity, and reduction-potential measurements with cysteine mutants","pmids":["24522867"],"confidence":"High","gaps":["In-cell relevance of redox switching to delivery rate not tested"]},{"year":2015,"claim":"Identified the upstream copper source by demonstrating ATOX1 acquires copper from the Cu-loaded Ctr1 C-terminal tail and from CCS, completing the import-to-chaperone handoff.","evidence":"Residue-level NMR and BCA competition with Ctr1 HCH peptide; SEC and NMR Cu exchange with CCS domain 1 and Atox1 Cys mutant","pmids":["26745413","25673218"],"confidence":"High","gaps":["Directional preference between Ctr1, CCS, and ATPases under cellular copper levels unresolved"]},{"year":2016,"claim":"Linked ATOX1 to cell motility, showing it localizes to lamellipodia and is required for breast cancer cell migration.","evidence":"Immunostaining and wound-healing assay with siRNA knockdown","pmids":["28027931"],"confidence":"Medium","gaps":["Molecular target at lamellipodia not identified in this study"]},{"year":2017,"claim":"Provided a structural-dynamic mechanism for ATPase activation and identified the membrane as a scaffold for copper loading.","evidence":"SAXS, NMR dynamics, and ATPase assays on ATP7B MBD1-3; lipid binding and in vivo copper-loading assays with Lys mutants; ChIP-based SOD3 transcription study","pmids":["28900031","24036897","29168020"],"confidence":"High","gaps":["Transcriptional SOD3 role established in only one cell context"]},{"year":2019,"claim":"Revealed an anti-amyloid role by mapping a direct ATOX1-α-synuclein interaction that inhibits amyloid formation.","evidence":"Residue-level NMR, in-cell proximity ligation, and in vitro amyloid assays","pmids":["31600047"],"confidence":"High","gaps":["In vivo neuroprotective relevance not established"]},{"year":2020,"claim":"Placed ATOX1 mechanistically in copper-driven cancer migration via the ATP7A-LOX axis and clarified its monomer/dimer transfer cycle.","evidence":"Single-cell tracking with siRNA and proximity ligation/LOX activity assays; EPR/QM-MM of Cu(I) coordination and dimerization; EPR transfer to ATP7B MBD1/MBD4","pmids":["31932435","32396355","32748830"],"confidence":"High","gaps":["Whether migration phenotype reflects chaperone vs transcriptional function not fully dissected"]},{"year":2021,"claim":"Expanded the chaperone target network by identifying nuclear CRIP2 as a copper acceptor whose ATOX1-driven copper loading triggers its degradation and modulates ROS and autophagy.","evidence":"APEX2 proximity labeling/MS, Co-IP, in vitro copper transfer, and knockdown with ROS/autophagy assays","pmids":["34550632"],"confidence":"High","gaps":["Generality of nuclear copper-transfer targeting beyond CRIP2 unknown"]},{"year":2022,"claim":"Extended ATOX1 transcriptional control to DNA damage repair via MDC1 and added Memo1 and zinc-bridged dimerization to its interaction repertoire.","evidence":"ChIP and promoter reporters with ATOX1 knockout xenografts and gemcitabine sensitivity; Memo1 Cu exchange and proximity ligation; Zn-loaded Atox1 crystal structure","pmids":["35315340","36067318","36291703"],"confidence":"Medium","gaps":["Physiological role of zinc binding not established","Memo1-to-Atox1 shuttling not demonstrated in vivo"]},{"year":2024,"claim":"Defined a copper-dependent ATOX1-DJ-1 partnership as the basis of ATOX1's antioxidant protection, mechanistically separating it from the chaperone CXXC delivery role.","evidence":"Co-IP/MS, copper-binding mutants, DJ-1 knockdown/overexpression epistasis, and oxidative-stress assays in cells and a mouse TBI model","pmids":["38640584"],"confidence":"Medium","gaps":["Direct biochemical mechanism of DJ-1-dependent protection unresolved","Single-lab finding"]},{"year":null,"claim":"How ATOX1 partitions between its cytosolic chaperone, nuclear transcription-factor, and antioxidant roles under physiological copper and redox states remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model coupling copper flux to nuclear translocation","Determinants of target-protein vs DNA selectivity unknown","In vivo significance of zinc, platinum, and α-synuclein interactions unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0,2,4,11,25]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[12,30,36]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[12,30,36]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[4,28]},{"term_id":"GO:0016209","term_label":"antioxidant activity","supporting_discovery_ids":[1,39]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3,17]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[12,30,36]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[29,27]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,3,4,5,25]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[12,30,36]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[24,30,39]}],"complexes":[],"partners":["ATP7B","ATP7A","CTR1","CCS","MEMO1","CRIP2","SNCA","PARK7"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O00244","full_name":"Copper transport protein ATOX1","aliases":["Metal transport protein ATX1"],"length_aa":68,"mass_kda":7.4,"function":"Binds and deliver cytosolic copper to the copper ATPase proteins. May be important in cellular antioxidant defense","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/O00244/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATOX1","classification":"Not Classified","n_dependent_lines":14,"n_total_lines":1208,"dependency_fraction":0.011589403973509934},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ATOX1","total_profiled":1310},"omim":[{"mim_id":"602270","title":"ANTIOXIDANT PROTEIN 1; ATOX1","url":"https://www.omim.org/entry/602270"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ATOX1"},"hgnc":{"alias_symbol":["HAH1"],"prev_symbol":[]},"alphafold":{"accession":"O00244","domains":[{"cath_id":"3.30.70.100","chopping":"2-66","consensus_level":"high","plddt":98.2631,"start":2,"end":66}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O00244","model_url":"https://alphafold.ebi.ac.uk/files/AF-O00244-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O00244-F1-predicted_aligned_error_v6.png","plddt_mean":97.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATOX1","jax_strain_url":"https://www.jax.org/strain/search?query=ATOX1"},"sequence":{"accession":"O00244","fasta_url":"https://rest.uniprot.org/uniprotkb/O00244.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O00244/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O00244"}},"corpus_meta":[{"pmid":"9083055","id":"PMC_9083055","title":"Identification and functional expression of 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(atx1Δ growth rescue, Fet3p copper incorporation)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional complementation in two independent yeast deletion strains with defined molecular readouts, replicated across multiple assays in a foundational study\",\n      \"pmids\": [\"9083055\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HAH1 binds Cu(I) via two conserved cysteine residues (Cys12, Cys15) in the MTCXGC motif; site-directed mutagenesis of these cysteines abrogates copper trafficking to the secretory compartment in vivo. In contrast, mutation of conserved C-terminal lysine residues eliminates antioxidant function but not copper trafficking, demonstrating that distinct residues mediate the two functions.\",\n      \"method\": \"In vitro Cu(I) binding assay with recombinant protein; site-directed mutagenesis; yeast complementation (Fet3p copper incorporation; sod1Δ antioxidant assay)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution plus mutagenesis plus in vivo functional readouts, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"9430722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"HAH1 directly interacts with the Wilson disease protein (ATP7B) and the Menkes protein (ATP7A) in a copper-dependent manner; interaction requires the cysteine copper ligands in the HAH1 amino terminus. Disease-associated mutations in the N-terminus of ATP7B markedly diminish HAH1 interaction, suggesting impaired copper delivery underlies Wilson disease in those patients.\",\n      \"method\": \"GST pulldown with recombinant GST-HAH1 fusion; co-immunoprecipitation from human cell lysates; site-directed mutagenesis of cysteine ligands and disease-associated ATP7B mutations\",\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 plus GST pulldown plus mutagenesis, multiple orthogonal methods, foundational study widely replicated\",\n      \"pmids\": [\"10557326\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Atox1-deficient (Atox1−/−) mouse cells accumulate high levels of intracellular copper due to impaired cellular copper efflux, directly demonstrating Atox1's role in trafficking copper to the secretory pathway for export.\",\n      \"method\": \"Genetic knockout mouse model; metabolic copper studies in Atox1−/− vs Atox1+/+ cells; measurement of intracellular copper accumulation and efflux\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined cellular phenotype (copper efflux defect), replicated in subsequent studies\",\n      \"pmids\": [\"11391006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Atox1 transfers copper to the purified N-terminal domain of the Wilson disease protein (N-WNDP) in a dose-dependent and saturable manner (up to six copper atoms); incubation of copper-Atox1 with full-length WNDP stimulates its ATPase catalytic activity. Apo-Atox1 can remove copper from metalated N-WNDP, down-regulating WNDP activity, demonstrating bidirectional copper regulation.\",\n      \"method\": \"In vitro copper transfer assay with recombinant proteins; ATPase activity measurements; copper occupancy analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution of copper transfer with defined enzymatic readout, multiple parameters measured\",\n      \"pmids\": [\"12029094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Atox1 is essential for copper-mediated intracellular trafficking of the Menkes ATPase (ATP7A): in Atox1-deficient cells, copper-stimulated translocation of the Menkes ATPase from the Golgi compartment is significantly impaired compared to wild-type cells, even at equivalent intracellular copper content.\",\n      \"method\": \"Quantitative confocal immunofluorescence time-course in Atox1+/+ vs Atox1−/− immortalized fibroblasts; copper dose-response trafficking 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 — clean knockout cell lines with direct localization and trafficking readout, time- and dose-dependent analysis\",\n      \"pmids\": [\"12538877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"X-ray absorption spectroscopy (XAS) of HAH1 reconstituted with Cu(I) reveals a linear bis-cysteinate coordination geometry (two Cu-S interactions at 2.16 Å); exogenous thiols (GSH, DTT) and phosphines can form three-coordinate adducts with Cu(I)-HAH1, with differing affinities.\",\n      \"method\": \"X-ray absorption spectroscopy (EXAFS/XANES); Cu(I) reconstitution; titration with exogenous ligands\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct structural determination by XAS with chemical validation; single lab but rigorous in vitro reconstitution\",\n      \"pmids\": [\"12686548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Atox1 interacts with all six metal-binding sites (MBS1–6) of the Menkes ATPase (MNK) in a copper-dependent manner; copper-dependent binding requires intact CXXC cysteine motifs. Binding constants for chaperone–MBS interactions are in the 10−5–10−6 M range and are non-cooperative.\",\n      \"method\": \"Yeast two-hybrid assay; surface plasmon resonance (SPR) kinetic analysis; site-directed mutagenesis of CXXC motifs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two independent methods (Y2H and SPR) with quantitative kinetics; single lab\",\n      \"pmids\": [\"12679332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The N-terminal metal-binding site 2 (MBS2) of the Wilson disease protein plays a preferential role in copper transfer from Atox1: copper transfer from Atox1 selectively protects MBS2 cysteines against labeling, site-directed mutagenesis of MBS2 eliminates ATPase stimulation by copper-Atox1 but not by free copper, and MBS2 retains copper better than Atox1 (demonstrated by chelator competition), facilitating directional transfer.\",\n      \"method\": \"Cysteine-directed probe labeling; site-directed mutagenesis; ATPase activity assay; copper chelator competition; X-ray absorption spectroscopy of isolated MBS2\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal methods (mutagenesis, labeling protection, XAS, enzymatic assay) in a single rigorous study\",\n      \"pmids\": [\"14754885\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NMR solution structure of apo- and Cu(I)-loaded HAH1 shows minor structural rearrangements upon copper binding; Cu(I) is confirmed to be two-coordinate in the holoprotein. The lower tendency of HAH1 versus orthologs to switch from two- to three-coordination may be mechanistically relevant for copper transfer.\",\n      \"method\": \"NMR solution structure determination; comparison of apo vs holo forms\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structure with functional validation; single lab, consistent with X-ray data from other studies\",\n      \"pmids\": [\"15476398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"HAH1 forms copper-dependent homodimers (apparent Kd ~6 µM) as measured by solid-phase assay and Biacore; copper-loaded HAH1 interacts independently with each of the six individual metal-binding domains of the Menkes ATPase; homodimerization was confirmed in living cells by FRET.\",\n      \"method\": \"Solid-phase binding assay; Biacore surface plasmon resonance; FRET in living cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two biophysical methods plus in-cell FRET; single lab, consistent with crystal structure data\",\n      \"pmids\": [\"15530404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NMR titration of the Wilson disease protein domains 5–6 (WLN5-6) with Cu(I)-HAH1 reveals no complex formation and no copper exchange, whereas HAH1 forms a fast-exchange adduct with domain 4 (WLN4) and domain 2 (WLN2). Cu(I) is transferred from WLN4 to WLN5-6 (first to WLN6, then to WLN5) without forming a detectable adduct, suggesting WLN4 and WLN2 are the direct acceptors from HAH1 that route copper to WLN5-6.\",\n      \"method\": \"NMR titration; 15N relaxation measurements; solution structure of apoWLN5-6\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR-based structural and transfer analysis with multiple domain constructs; rigorous single study\",\n      \"pmids\": [\"16571664\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Atox1 functions as a copper-dependent transcription factor: copper stimulates Atox1 nuclear translocation (via C-terminal KKTGK motif and N-terminal copper-binding sites), binding to a cis-element in the cyclin D1 (Ccnd1) promoter (shown by EMSA and ChIP), and transactivation of cyclin D1 expression, driving cell proliferation. Atox1−/− MEFs fail to proliferate in response to copper; re-expression of nuclear-targeted Atox1 rescues this defect.\",\n      \"method\": \"Promoter analysis; EMSA; ChIP assay; Gal4-fusion transactivation assay; Atox1−/− MEF rescue experiments; fluorescence microscopy for nuclear translocation; cell cycle analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, transactivation, genetic rescue), copper-dependence established, consistent across cell types\",\n      \"pmids\": [\"18245776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HAH1 forms a ~70% complex (fast exchange) with metal-binding domain 4 of ATP7B but not with domains 5–6; both domains 3 and 4 can be loaded with Cu(I) by HAH1, while domains 3 and 4 tend to aggregate in a concentration-dependent manner via nonspecific intermolecular interactions.\",\n      \"method\": \"NMR solution structure of WLN3-4; NMR interaction experiments with Cu(I)-HAH1; 15N relaxation data\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural study with interaction mapping; single lab, consistent with domain 4 preference shown in other studies\",\n      \"pmids\": [\"18558714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Conserved residues Met10 and Lys60 modulate Cu(I) release from Atox1: both Met10Ala and Lys60Ala mutants lose Cu(I) more readily than wild-type due to more rapid displacement from the Atox1-Cu-BCA intermediate, suggesting these residues control the kinetics of copper delivery to target proteins.\",\n      \"method\": \"Cu(I) displacement kinetics using bicinchoninic acid (BCA) as metal acceptor; stopped-flow spectroscopy; point mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro kinetic reconstitution with mutagenesis, defined mechanistic model; single lab\",\n      \"pmids\": [\"18685091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Atox1 forms a stable Cu-dependent heterocomplex with the fourth metal-binding domain of Wilson disease protein (WD4); Lys60 is essential for adduct formation and copper transfer, while Met10 and Thr11 are dispensable for adduct formation. Electrostatic interaction mediated by Lys60 is the key energetic contributor to heterocomplex stability.\",\n      \"method\": \"Near-UV circular dichroism; gel filtration; molecular dynamics simulations; point-mutated Atox1 variants\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple biophysical methods plus simulations plus mutagenesis in a single study\",\n      \"pmids\": [\"19863064\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"NMR study of the entire six-domain N-terminal tail of ATP7B shows that all six metal-binding domains are metallated by Cu(I)-HAH1, with domains 1, 2, and 4 forming adducts with HAH1. This is distinct from ATP7A, where only two domains form such adducts, indicating different mechanisms of copper delivery between the two ATPases.\",\n      \"method\": \"NMR solution spectroscopy; interaction experiments with Cu(I)-HAH1 and the full-length N-terminal tail construct\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR with defined protein construct; single lab, direct comparison to ATP7A\",\n      \"pmids\": [\"19181666\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"In Atox1-deficient fibroblasts, synchrotron X-ray fluorescence imaging reveals that the characteristic perinuclear copper distribution of wild-type cells is replaced by a diffuse, unstructured distribution throughout the cell, without changes in zinc or iron distribution, confirming Atox1 as a key organizer of subcellular copper localization.\",\n      \"method\": \"Quantitative synchrotron X-ray fluorescence (SXRF) imaging of Atox1+/+ vs Atox1−/− mouse fibroblasts\",\n      \"journal\": \"Journal of biological inorganic chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct elemental imaging with genetic control; single lab, single method but highly specific readout\",\n      \"pmids\": [\"19865834\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Atox1 binds cisplatin at its metal-binding site in both the apo and Cu-loaded forms; the resulting Atox1-cisplatin adduct is unstable over time and the protein unfolds and aggregates in a cisplatin-specific manner. In-cell NMR shows that a {Pt(NH3)2}-Atox1 adduct forms intracellularly, leading to protein dimerization and loss of ammine ligands over time. Overexpression of Atox1 in E. coli reduces DNA platination.\",\n      \"method\": \"Solution NMR; in-cell NMR spectroscopy; circular dichroism; cell filamentation assay\",\n      \"journal\": \"Journal of the American Chemical Society\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in-cell and solution NMR with orthogonal functional readout; rigorous structural characterization\",\n      \"pmids\": [\"21981264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cu(I) binding affinities of Atox1 and related metallochaperone proteins (including ATP7B domains 5 and 6) were unified using validated Cu(I) probes (bicinchoninic acid and bathocuproine disulfonate); Atox1-type proteins bind Cu(I) with sub-femtomolar affinities (KD values), consistent with tight buffering of labile Cu+ in cells.\",\n      \"method\": \"Competitive and non-competitive Cu(I) binding assays with four validated spectroscopic probes; quantitative affinity determination\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro thermodynamic measurements using multiple validated probes; comprehensive analysis\",\n      \"pmids\": [\"21258123\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Cisplatin binds to the metal-binding site of Atox1 in vitro regardless of copper occupancy; the cisplatin-bound protein is destabilized and unfolds/aggregates over time. The unfolding effect is specific to Atox1 and not observed for two unrelated cisplatin-binding proteins.\",\n      \"method\": \"Near-UV and far-UV circular dichroism; NMR spectroscopy; in vitro protein stability assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple spectroscopic methods, specificity controls, single lab\",\n      \"pmids\": [\"21482801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Atox1 transfers platinum (cisplatin) to the metal-binding domain 2 (MBD2) of ATP7B, producing the same Pt-cysteine adduct as direct cisplatin binding, suggesting that Pt can travel along the copper transport pathway as a mechanism of cisplatin detoxification/delivery.\",\n      \"method\": \"X-ray absorption spectroscopy; in vitro Pt transfer assays from Atox1 to MBD2\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — XAS structural characterization of platinum adduct plus transfer assay; single lab\",\n      \"pmids\": [\"23751120\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cu(I) and glutathione form large polymeric clusters that can transfer copper to Atox1; under physiological redox conditions, both copper and cisplatin bind simultaneously to Atox1 through copper-sulfur-platinum bridges involving both Cys12 and Cys15.\",\n      \"method\": \"Mass spectrometry; X-ray absorption spectroscopy; redox-controlled in vitro binding assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — XAS plus MS structural analysis; single lab, physiologically relevant redox conditions\",\n      \"pmids\": [\"28549213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Both Cys12 and Cys15 of Atox1 are required to form a simultaneous Cu-Pt di-metal complex with cisplatin; Cys41 is not involved. Atox1 can deliver cisplatin to ATP7B domain 4 (WD4) in vitro, providing evidence for a drug detoxification mechanism via the copper export pathway.\",\n      \"method\": \"Near-UV CD spectroscopy; gel filtration; strategic Atox1 point mutants; in vitro Pt transfer to WD4\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods (CD, gel filtration, mutagenesis, transfer assay); single lab\",\n      \"pmids\": [\"23936210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human glutaredoxin 1 (hGrx1) catalyzes the interchange between dithiol and disulfide forms of the Cys12-Cys15 motif in Atox1; the direction of catalysis is regulated by the GSSG/2GSH ratio and availability of Cu(I). hGrx1 binds Cu(I) with femtomolar affinity, and the reduction potential of Atox1's CXXC motif (−188 mV) is more negative than that of hGrx1 (−118 mV), mechanistically linking copper homeostasis to redox regulation.\",\n      \"method\": \"In vitro redox catalysis assays; Cu(I) affinity measurements; reduction potential determination; mutagenesis of active-site cysteines\",\n      \"journal\": \"Metallomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of enzymatic catalysis, quantitative thermodynamic parameters, mutagenesis; single lab\",\n      \"pmids\": [\"24522867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The C-terminal cytoplasmic tail of Ctr1 (13-residue HCH-containing peptide) binds Cu(I) with KD ~10−14 M; Atox1 acquires Cu from the Cu-loaded Ctr1 C-terminal peptide as demonstrated by NMR at the residue level. The two proteins do not interact in the absence of Cu, indicating that Cu binding to the Ctr1 tail regulates release to downstream chaperones.\",\n      \"method\": \"NMR spectroscopy; bicinchoninic acid competition assays; site-directed mutation of HCH motif\",\n      \"journal\": \"Biophysical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — residue-level NMR plus quantitative affinity measurements; mechanistic model well-supported\",\n      \"pmids\": [\"26745413\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The cytoplasmic Cu chaperones Atox1 and CCS (domain 1) can exchange Cu ions in vitro; Cu transfer occurs in both directions, and mutation of the Cu-binding cysteine in Atox1 eliminates Cu transfer from CCS1, demonstrating that exchange involves the metal-binding sites.\",\n      \"method\": \"Size-exclusion chromatography with 254/280 nm ratio as Cu-loading indicator; NMR; full-length CCS transfer experiments; Atox1 Cys mutant\",\n      \"journal\": \"Biometals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two methods (SEC and NMR) with mutagenesis control; single lab\",\n      \"pmids\": [\"25673218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Atox1 accumulates at lamellipodia edges of migrating breast cancer cells; siRNA-mediated silencing of Atox1 reduces breast cancer cell migration (wound healing assay), suggesting a role in cell motility linked to copper chaperone function.\",\n      \"method\": \"Immunostaining and fluorescence microscopy; wound healing migration assay; siRNA knockdown\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization plus loss-of-function migration phenotype; single lab, two methods\",\n      \"pmids\": [\"28027931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The copper chaperone Atox1 regulates ATP7B catalytic activity by modulating domain dynamics of MBD1-3: copper transfer from Atox1 to ATP7B decreases domain interactions within MBD1-3 and increases individual domain mobility (measured by SAXS and NMR), activating ATP hydrolysis. The N-terminal segment of MBD1-3 physically interacts with the nucleotide-binding domain of ATP7B, coupling copper binding to ATP hydrolysis.\",\n      \"method\": \"Small-angle X-ray scattering (SAXS); solution NMR; ATPase activity assays; apo-Atox1 and Cu-Atox1 comparative studies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SAXS structural analysis plus NMR dynamics plus enzymatic assay; multiple orthogonal methods in one study\",\n      \"pmids\": [\"28900031\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Atox1 contains positively charged surface lysine residues that mediate association with negatively charged lipid membranes; loss of these residues lowers copper loading efficiency in vivo, suggesting the membrane bilayer acts as a scaffold facilitating copper loading of Atox1.\",\n      \"method\": \"Lipid binding assays; in vivo copper loading assays with Lys mutants; membrane association experiments\",\n      \"journal\": \"The Journal of membrane biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional mutagenesis with in vivo copper loading readout; single lab\",\n      \"pmids\": [\"24036897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Atox1 can function as a transcription factor for SOD3: in TPA-differentiated THP-1 cells, Atox1 undergoes copper-dependent nuclear translocation, binds the SOD3 promoter (demonstrated by ChIP), and overexpression/knockdown of Atox1 enhances/suppresses TPA-induced SOD3 expression.\",\n      \"method\": \"Nuclear translocation assay; ChIP assay; Atox1 overexpression and knockdown; quantitative RT-PCR and Western blot for SOD3\",\n      \"journal\": \"Biometals\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus genetic gain/loss-of-function; single lab, single cell-type context\",\n      \"pmids\": [\"29168020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Atox1 interacts with α-synuclein in living cells (proximity ligation assay) and in vitro (NMR); the interaction interface in α-synuclein involves the N-terminal region up to Gln24, while in Atox1, residues around the copper-binding cysteines (positions 11–16) are primarily involved. Atox1 inhibits amyloid formation of both non-acetylated and N-terminally acetylated α-synuclein in vitro.\",\n      \"method\": \"Solution NMR spectroscopy with isotopically labeled proteins; in-cell proximity ligation assay; in vitro amyloid formation assays\",\n      \"journal\": \"ACS chemical neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — residue-level NMR interaction mapping plus in-cell proximity ligation; two orthogonal methods, single lab\",\n      \"pmids\": [\"31600047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Atox1 is required for breast cancer cell migration velocity and directionality (tracked at single-cell level); silencing Atox1 also reduces copper transporter ATP7A expression effects and decreases LOX (lysyl oxidase) activity, placing Atox1 in the ATP7A–LOX axis for copper-mediated cancer cell migration.\",\n      \"method\": \"Video microscopy single-cell tracking (~hundreds of cells per condition); siRNA knockdown; in-cell proximity ligation assay for Atox1-ATP7A-LOX proximity; LOX activity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — large-scale quantitative single-cell tracking with genetic knockdown plus proximity ligation and enzymatic activity assay; multiple orthogonal methods\",\n      \"pmids\": [\"31932435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EPR and computational analysis reveals that Cu(I) binding in Atox1 involves Cys12 as the primary Cu(I)-binding residue while Cys15 is important for Atox1 dimerization; Lys60 electrostatically stabilizes the Cu(I)-Atox1 dimer. Atox1 interacts with Ctr1 as a dimer but transfers copper to ATP7A/B as a monomer.\",\n      \"method\": \"Continuous wave and pulsed EPR spectroscopy; QM/MM molecular dynamics simulations; site-directed spin labeling\",\n      \"journal\": \"The journal of physical chemistry. B\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — EPR with computational validation; single lab, consistent with prior structural data\",\n      \"pmids\": [\"32396355\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"EPR spectroscopy of Cu(I)-bound Atox1 with ATP7B metal-binding domains shows that Cu(I) is most likely transferred from Atox1 monomer to MBD1 and MBD4 of ATP7B; MBD1-3 and MBD4-6 act as two independent functional units, and other MBDs mediate intramolecular copper routing.\",\n      \"method\": \"CW and pulsed EPR spectroscopy in solution; spin-labeled protein constructs\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biophysical measurement of Cu(I) transfer with defined domain constructs; single lab\",\n      \"pmids\": [\"32748830\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"APEX2-based proximity labeling of Atox1 identified CRIP2 as a nuclear copper-binding protein that interacts with Atox1; Atox1 transfers copper to CRIP2, inducing a conformational change that promotes CRIP2 ubiquitin-mediated proteasomal degradation. CRIP2 degradation (or depletion) elevates ROS and activates autophagy in cancer cells.\",\n      \"method\": \"APEX2 proximity labeling combined with mass spectrometry; co-immunoprecipitation; in vitro copper transfer; secondary structure analysis; siRNA knockdown; autophagy and ROS assays\",\n      \"journal\": \"Angewandte Chemie\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling/MS for interaction discovery, confirmed by Co-IP and in vitro transfer, functional validation by knockdown; multiple orthogonal methods\",\n      \"pmids\": [\"34550632\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ATOX1 promotes copper-dependent transcription of MDC1 (a double-strand DNA damage repair protein): after genotoxic stress, ATOX1 translocates to the nucleus and binds the MDC1 promoter in a copper-dependent manner, enhancing DNA damage repair. Knockout or blockade of ATOX1 sensitizes tumors to gemcitabine in mouse models.\",\n      \"method\": \"ChIP assay; promoter reporter assay; ATOX1 knockout cell lines and mouse xenograft models; Western blot for MDC1; genotoxic drug sensitivity assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP confirms direct promoter binding, genetic loss-of-function in vivo; single lab\",\n      \"pmids\": [\"35315340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Memo1 binds two Cu(I) ions per protein, shields them from ROS generation, and exchanges Cu(I) with the copper chaperone Atox1 in vitro; spatial proximity between Memo1 and Atox1 is confirmed in breast cancer cells by proximity ligation assay, suggesting Memo1 may shuttle Cu to Atox1 for delivery to the secretory pathway.\",\n      \"method\": \"Multiple biophysical methods (spectroscopy) for Cu binding; in vitro Cu exchange assay; proximity ligation assay in breast cancer cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biophysical methods plus in-cell proximity ligation; single lab\",\n      \"pmids\": [\"36067318\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Crystal structure of Atox1 loaded with Zn2+ shows the Zn ion bridging the CXXC motifs of two Atox1 molecules in a homodimer with tetrahedral coordination; EDTA soaking causes only limited Zn removal, suggesting potential involvement of Atox1 in zinc metabolism in addition to copper.\",\n      \"method\": \"X-ray crystallography; anomalous diffraction near Zn K-edge for metal identity; EDTA soaking experiments\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — crystal structure with identity confirmation; single study, functional implications not fully established\",\n      \"pmids\": [\"36291703\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Atox1 binds DJ-1 in a copper-dependent manner (copper-binding motif mutation or free copper sequestration reduces the interaction); DJ-1 mediates Atox1's antioxidant capacity, as DJ-1 knockdown impairs Atox1-mediated protection against oxidative stress, and overexpression of DJ-1 fails to restore antioxidant function of copper-binding-deficient Atox1 mutants.\",\n      \"method\": \"Co-immunoprecipitation and mass spectrometry; site-directed Atox1 mutations; DJ-1 knockdown and overexpression; oxidative stress and mitochondrial function assays in HT-22 cells and mouse TBI model\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP/MS for interaction, mutagenesis for copper-dependence, genetic epistasis for functional relevance; single lab\",\n      \"pmids\": [\"38640584\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATOX1 (HAH1) is a small cytoplasmic copper chaperone that binds Cu(I) with sub-femtomolar affinity via a conserved Cys12-Cys15 (CXXC) motif, acquires Cu from the Ctr1 C-terminal tail, and delivers it—via direct, copper-dependent protein–protein interactions—to the N-terminal metal-binding domains of the copper-transporting P-type ATPases ATP7A (Menkes) and ATP7B (Wilson), preferentially engaging domain 4 first and thereby stimulating their catalytic activity and enabling copper-dependent Golgi trafficking; in addition, ATOX1 undergoes copper-stimulated nuclear translocation (requiring the C-terminal KKTGK motif) where it acts as a transcription factor that binds promoters of cyclin D1, SOD3, MDC1, and other targets to drive cell proliferation, DNA damage repair, and antioxidant responses, while its redox state is regulated by glutaredoxin 1 and the GSH/GSSG couple, linking copper homeostasis to cellular redox balance.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ATOX1 (HAH1) is a small cytosolic copper(I) chaperone that delivers copper to the secretory pathway and coordinates intracellular copper distribution [#0, #17]. It binds Cu(I) with sub-femtomolar affinity through a conserved Cys12-Cys15 (MTCXGC) motif in a near-linear bis-cysteinate geometry, and these cysteine ligands are obligatory for copper trafficking [#1, #6, #19]. ATOX1 acquires copper from the Cu-loaded C-terminal cytoplasmic tail of the importer Ctr1 in a strictly copper-dependent manner [#25] and delivers it through direct, copper-dependent protein-protein contacts to the N-terminal metal-binding domains of the copper-transporting P-type ATPases ATP7A (Menkes) and ATP7B (Wilson), preferentially engaging domain 4 to route copper to downstream domains and thereby stimulating ATPase catalytic activity by altering inter-domain dynamics [#2, #4, #11, #28]; disease-associated ATP7B N-terminal mutations weaken this interaction, linking impaired copper delivery to Wilson disease [#2]. Genetic loss of Atox1 causes intracellular copper accumulation, an efflux defect, and failure of copper-stimulated trafficking of ATP7A out of the Golgi, with loss of the normal perinuclear copper distribution [#3, #5, #17]. Beyond chaperone function, copper stimulates ATOX1 nuclear translocation via its C-terminal KKTGK motif, where it acts as a transcription factor binding the promoters of cyclin D1, SOD3, and MDC1 to drive proliferation, antioxidant responses, and DNA damage repair [#12, #30, #36]. ATOX1 redox state is governed by glutaredoxin 1 and the GSH/GSSG couple, coupling copper handling to cellular redox balance [#24], and the protein contributes to copper-dependent cancer cell migration through an ATP7A-LOX axis [#27, #32]. ATOX1 also binds platinum drugs such as cisplatin through the same cysteine motif and can shuttle platinum to ATP7B domains, implicating it in drug detoxification [#18, #21, #23].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established that ATOX1 is a bona fide copper chaperone for the secretory pathway, resolving whether the human gene had conserved metallochaperone function.\",\n      \"evidence\": \"Yeast atx1\\u0394 complementation restoring Fet3p copper incorporation and high-affinity iron uptake\",\n      \"pmids\": [\"9083055\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the mammalian copper acceptor proteins\", \"No structural basis for copper binding\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defined the molecular determinants of ATOX1's two functions, showing that the Cys12/Cys15 motif mediates copper trafficking while distinct C-terminal lysines mediate antioxidant activity.\",\n      \"evidence\": \"In vitro Cu(I) binding, site-directed mutagenesis, and yeast complementation (Fet3p and sod1\\u0394 assays)\",\n      \"pmids\": [\"9430722\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of antioxidant function not defined\", \"Copper acceptor still unidentified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified the physiological copper acceptors by demonstrating copper-dependent direct interaction with the Menkes and Wilson disease ATPases, linking ATOX1 to human copper disorders.\",\n      \"evidence\": \"GST pulldown and co-immunoprecipitation from human cells with mutagenesis of cysteine ligands and disease-associated ATP7B mutations\",\n      \"pmids\": [\"10557326\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish directionality or kinetics of transfer\", \"Which specific ATPase domains accept copper unresolved\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Provided in vivo proof that ATOX1 is required for cellular copper efflux, showing its loss causes intracellular copper accumulation.\",\n      \"evidence\": \"Atox1-knockout mouse cells with metabolic copper efflux and accumulation measurements\",\n      \"pmids\": [\"11391006\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not separate trafficking from transcriptional contributions to phenotype\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Reconstituted directional copper transfer to ATP7B and demonstrated bidirectional regulation of ATPase activity, defining ATOX1 as a functional activator of the pump.\",\n      \"evidence\": \"In vitro copper transfer to N-WNDP, ATPase activity assays, and apo-Atox1 copper removal experiments\",\n      \"pmids\": [\"12029094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Domain-level acceptor preference not yet mapped\", \"Coupling to ATP hydrolysis not structurally explained\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed ATOX1 is essential for copper-stimulated Golgi-to-vesicle trafficking of ATP7A, distinguishing trafficking control from bulk copper content.\",\n      \"evidence\": \"Confocal trafficking time-course in Atox1+/+ vs Atox1\\u2212/\\u2212 fibroblasts at matched copper levels\",\n      \"pmids\": [\"12538877\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address ATP7B trafficking dependence\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Determined the Cu(I) coordination geometry and mapped chaperone binding across all six ATPase metal-binding sites, establishing the structural basis of transfer.\",\n      \"evidence\": \"XAS of Cu(I)-HAH1; yeast two-hybrid and SPR kinetics against MNK MBS1-6 with CXXC mutants\",\n      \"pmids\": [\"12686548\", \"12679332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve which MBS is the kinetically preferred acceptor\", \"Functional consequence of binding all six sites unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Refined the transfer mechanism by identifying MBS2 of ATP7B as a preferential, copper-retaining acceptor and resolving the apo/holo conformational change driving transfer.\",\n      \"evidence\": \"Cysteine-protection labeling, MBS2 mutagenesis, chelator competition, XAS, and NMR of apo/Cu(I)-HAH1\",\n      \"pmids\": [\"14754885\", \"15476398\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of MBS2 preference with later domain-4 preference unresolved\", \"In-cell relevance of single-domain preference not tested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated copper-dependent ATOX1 homodimerization in vitro and in living cells, adding an oligomeric dimension to the transfer mechanism.\",\n      \"evidence\": \"Solid-phase binding, Biacore, and FRET in living cells\",\n      \"pmids\": [\"15530404\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of dimer vs monomer in transfer not resolved here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Mapped the intramolecular copper routing within ATP7B, showing domains 4 and 2 are the direct HAH1 acceptors that relay copper to domains 5-6.\",\n      \"evidence\": \"NMR titration and relaxation with WLN4, WLN2, and WLN5-6 domain constructs\",\n      \"pmids\": [\"16571664\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish which domain transfer is rate-limiting in vivo\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Discovered a non-chaperone role for ATOX1 as a copper-dependent transcription factor driving cyclin D1 and cell proliferation, expanding its biology beyond metal delivery.\",\n      \"evidence\": \"EMSA, ChIP, Gal4 transactivation, nuclear translocation imaging, and Atox1\\u2212/\\u2212 MEF rescue\",\n      \"pmids\": [\"18245776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full repertoire of transcriptional targets unknown\", \"Mechanism of promoter recognition by a small chaperone unclear\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Defined kinetic control of copper release and confirmed ATP7B domain-4 preference, identifying residues that tune delivery rate.\",\n      \"evidence\": \"Stopped-flow Cu(I) displacement kinetics with Met10/Lys60 mutants; NMR of WLN3-4 interaction\",\n      \"pmids\": [\"18685091\", \"18558714\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In-cell impact of Met10/Lys60 mutations not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established Lys60-driven electrostatics as the key energetic contributor to heterocomplex stability and reconciled ATPase-specific delivery modes.\",\n      \"evidence\": \"CD, gel filtration, and MD with Atox1 mutants for WD4; whole six-domain ATP7B NMR vs ATP7A; SXRF copper imaging of knockout cells\",\n      \"pmids\": [\"19863064\", \"19181666\", \"19865834\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why ATP7A and ATP7B use different numbers of acceptor domains is unexplained\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Quantified ATOX1's sub-femtomolar Cu(I) affinity and uncovered cisplatin binding/destabilization, linking the protein to platinum-drug handling.\",\n      \"evidence\": \"Validated Cu(I) probe affinity measurements; solution and in-cell NMR and CD of cisplatin adducts\",\n      \"pmids\": [\"21258123\", \"21981264\", \"21482801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological significance of cisplatin destabilization in tumors not established here\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed ATOX1 can carry platinum along the copper export pathway and that copper and platinum can bind simultaneously, supporting a drug-detoxification model.\",\n      \"evidence\": \"XAS and in vitro Pt transfer to ATP7B MBD2/WD4; MS and XAS of Cu-S-Pt bridges with both cysteines\",\n      \"pmids\": [\"23751120\", \"23936210\", \"28549213\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo contribution to cisplatin resistance not quantified\", \"Single-lab biophysical observations\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected copper homeostasis to redox regulation by showing glutaredoxin 1 controls the redox state of the ATOX1 CXXC motif via the GSH/GSSG couple.\",\n      \"evidence\": \"In vitro redox catalysis, Cu(I) affinity, and reduction-potential measurements with cysteine mutants\",\n      \"pmids\": [\"24522867\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In-cell relevance of redox switching to delivery rate not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified the upstream copper source by demonstrating ATOX1 acquires copper from the Cu-loaded Ctr1 C-terminal tail and from CCS, completing the import-to-chaperone handoff.\",\n      \"evidence\": \"Residue-level NMR and BCA competition with Ctr1 HCH peptide; SEC and NMR Cu exchange with CCS domain 1 and Atox1 Cys mutant\",\n      \"pmids\": [\"26745413\", \"25673218\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Directional preference between Ctr1, CCS, and ATPases under cellular copper levels unresolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked ATOX1 to cell motility, showing it localizes to lamellipodia and is required for breast cancer cell migration.\",\n      \"evidence\": \"Immunostaining and wound-healing assay with siRNA knockdown\",\n      \"pmids\": [\"28027931\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular target at lamellipodia not identified in this study\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided a structural-dynamic mechanism for ATPase activation and identified the membrane as a scaffold for copper loading.\",\n      \"evidence\": \"SAXS, NMR dynamics, and ATPase assays on ATP7B MBD1-3; lipid binding and in vivo copper-loading assays with Lys mutants; ChIP-based SOD3 transcription study\",\n      \"pmids\": [\"28900031\", \"24036897\", \"29168020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional SOD3 role established in only one cell context\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Revealed an anti-amyloid role by mapping a direct ATOX1-\\u03b1-synuclein interaction that inhibits amyloid formation.\",\n      \"evidence\": \"Residue-level NMR, in-cell proximity ligation, and in vitro amyloid assays\",\n      \"pmids\": [\"31600047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo neuroprotective relevance not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placed ATOX1 mechanistically in copper-driven cancer migration via the ATP7A-LOX axis and clarified its monomer/dimer transfer cycle.\",\n      \"evidence\": \"Single-cell tracking with siRNA and proximity ligation/LOX activity assays; EPR/QM-MM of Cu(I) coordination and dimerization; EPR transfer to ATP7B MBD1/MBD4\",\n      \"pmids\": [\"31932435\", \"32396355\", \"32748830\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether migration phenotype reflects chaperone vs transcriptional function not fully dissected\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Expanded the chaperone target network by identifying nuclear CRIP2 as a copper acceptor whose ATOX1-driven copper loading triggers its degradation and modulates ROS and autophagy.\",\n      \"evidence\": \"APEX2 proximity labeling/MS, Co-IP, in vitro copper transfer, and knockdown with ROS/autophagy assays\",\n      \"pmids\": [\"34550632\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of nuclear copper-transfer targeting beyond CRIP2 unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extended ATOX1 transcriptional control to DNA damage repair via MDC1 and added Memo1 and zinc-bridged dimerization to its interaction repertoire.\",\n      \"evidence\": \"ChIP and promoter reporters with ATOX1 knockout xenografts and gemcitabine sensitivity; Memo1 Cu exchange and proximity ligation; Zn-loaded Atox1 crystal structure\",\n      \"pmids\": [\"35315340\", \"36067318\", \"36291703\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role of zinc binding not established\", \"Memo1-to-Atox1 shuttling not demonstrated in vivo\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a copper-dependent ATOX1-DJ-1 partnership as the basis of ATOX1's antioxidant protection, mechanistically separating it from the chaperone CXXC delivery role.\",\n      \"evidence\": \"Co-IP/MS, copper-binding mutants, DJ-1 knockdown/overexpression epistasis, and oxidative-stress assays in cells and a mouse TBI model\",\n      \"pmids\": [\"38640584\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct biochemical mechanism of DJ-1-dependent protection unresolved\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ATOX1 partitions between its cytosolic chaperone, nuclear transcription-factor, and antioxidant roles under physiological copper and redox states remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model coupling copper flux to nuclear translocation\", \"Determinants of target-protein vs DNA selectivity unknown\", \"In vivo significance of zinc, platinum, and \\u03b1-synuclein interactions unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0, 2, 4, 11, 25]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [12, 30, 36]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [12, 30, 36]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [4, 28]},\n      {\"term_id\": \"GO:0016209\", \"supporting_discovery_ids\": [1, 39]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3, 17]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [12, 30, 36]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [29, 27]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 3, 4, 5, 25]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [12, 30, 36]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [24, 30, 39]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ATP7B\", \"ATP7A\", \"CTR1\", \"CCS\", \"MEMO1\", \"CRIP2\", \"SNCA\", \"PARK7\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":7,"faith_total":7,"faith_pct":100.0}}