{"gene":"ATP7A","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":1998,"finding":"ATP7A (MNK) localizes to the trans-Golgi network under basal copper conditions and redistributes to cytoplasmic vesicles and plasma membrane upon elevated copper, returning to TGN when copper is reduced; stable expression of full-length cDNA in CHO-K1 cells conferred copper resistance proportional to expression level, providing first ultrastructural evidence for TGN/vesicle/plasma membrane cycling.","method":"Stable transfection, immunogold electron microscopy, confocal microscopy, copper resistance assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (EM, confocal, functional resistance assay) in single rigorous study","pmids":["9668172"],"is_preprint":false},{"year":2003,"finding":"ATP7A is internalized from the plasma membrane via a clathrin- and caveolae-independent pathway that requires Rac1 GTPase activity; dominant-negative dynamin, Eps15, and caveolae inhibitors did not block ATP7A internalization, whereas constitutively active Rac1 inhibited internalization.","method":"Dominant-negative mutant expression, pharmacological inhibition, flow cytometry","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple negative controls plus positive Rac1 result, consistent with prior di-leucine motif requirement","pmids":["12812980"],"is_preprint":false},{"year":2004,"finding":"A di-leucine motif near the C-terminus of ATP7A (L1487/L1488) is required for endocytic retrieval from the plasma membrane; the N-terminal metal-binding domains are required for copper-regulated trafficking from TGN to plasma membrane in polarized MDCK cells, where ATP7A traffics to the basolateral membrane under elevated copper.","method":"Site-directed mutagenesis, confocal microscopy, surface biotinylation in polarized MDCK cells","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of specific motifs combined with functional trafficking readout","pmids":["15269005"],"is_preprint":false},{"year":2004,"finding":"ATP7A and ATP7B sequester cisplatin, carboplatin, and oxaliplatin into vesicular compartments, modulating platinum pharmacodynamics; ATP7A-expressing Menkes fibroblast sublines showed increased vesicular platinum sequestration for cisplatin and carboplatin without increasing nuclear platinum delivery, whereas oxaliplatin reached DNA more efficiently; copper (but not platinum drugs) triggered ATP7A relocalization from perinuclear to peripheral locations.","method":"Engineered human Menkes fibroblasts expressing ATP7A or ATP7B, ICP-MS platinum measurement, vesicle fractionation, confocal microscopy","journal":"Molecular pharmacology","confidence":"High","confidence_rationale":"Tier 2 — reconstituted transporter-proficient cell lines, multiple drugs, subcellular fractionation","pmids":["15213293"],"is_preprint":false},{"year":2005,"finding":"ATP7A traffics from TGN to a vesicular compartment adjacent to the basolateral membrane in copper-exposed intestinal epithelium of transgenic mice, supporting a model of vesicular exocytosis for copper export rather than direct pumping across the basolateral membrane.","method":"Copper perfusion of isolated jejunal segment, immunofluorescence of frozen sections in ATP7A transgenic mice","journal":"The Journal of nutrition","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic model with direct localization imaging, single lab","pmids":["16317117"],"is_preprint":false},{"year":2005,"finding":"ATP7A interacts with AIPP1 (ATPase-interacting PDZ protein) via its C-terminal class I PDZ-binding motif; interaction confirmed by yeast two-hybrid and co-immunoprecipitation from mammalian cells.","method":"Yeast two-hybrid screen, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 — yeast two-hybrid confirmed by single Co-IP, single lab","pmids":["16051599"],"is_preprint":false},{"year":2006,"finding":"Glutaredoxin 1 (GRX1) interacts with the N-terminal copper-binding domain of ATP7A in a copper-dependent manner requiring intact MxCxxC motifs; proposed to reduce disulfide bonds or deglutathionylate cysteines in the CxxC motifs to facilitate copper binding and transport.","method":"Yeast two-hybrid, co-immunoprecipitation from mammalian cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 3 — two orthogonal methods but single lab; mechanistic model proposed but not directly tested","pmids":["16884690"],"is_preprint":false},{"year":2007,"finding":"ATP7A is expressed in extending axons during synaptogenesis; loss of ATP7A in mottled brindled mice causes disrupted olfactory sensory neuron axonal projections, impaired mitral/tufted cell dendritic growth, and glomerular disorganization in the olfactory bulb, establishing a developmental role for ATP7A in axon outgrowth and synaptogenesis.","method":"In vivo analysis of Atp7aMobr (mottled brindled) mouse olfactory system, immunostaining, confocal microscopy","journal":"Molecular and cellular neurosciences","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function mouse model with specific neuroanatomical phenotype, single lab","pmids":["17215139"],"is_preprint":false},{"year":2007,"finding":"Purified full-length human ATP7A (MNK) expressed in Sf9 insect cells forms a vanadate-sensitive phosphoenzyme intermediate activated by Cu(I) (EC50 = 0.7 µM, Hill coefficient 4.6), exhibits Cu(I)-dependent ATPase activity (K0.5 = 0.6 µM), and mediates active ATP-dependent vectorial 64Cu transport when reconstituted into liposomes, demonstrating cooperative high-affinity Cu(I) interaction.","method":"Purification by antibody affinity chromatography, phosphoenzyme assay, ATPase activity assay, liposome reconstitution with 64Cu transport","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in vitro with purified full-length protein, multiple biochemical assays","pmids":["17009961"],"is_preprint":false},{"year":2007,"finding":"Mottled mouse mutations differentially impair ATP7A copper transport and trafficking: the embryonic-lethal Atp7amo11H mutation mislocalizes ATP7A to the ER, impairs glycosylation, and abolishes copper delivery to the secretory pathway; perinatal-lethal (Macular) and viable (Viable brindle) mutations reduce copper delivery and cause constitutive trafficking to the plasma membrane, with Viable brindle hypertrafficking dependent on the catalytic phosphorylation site.","method":"Site-directed mutagenesis, immunofluorescence, copper transport assays in cell lines expressing mutant ATP7A","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 1–2 — mutagenesis linked to specific functional and trafficking defects, multiple mutant alleles tested","pmids":["17483305"],"is_preprint":false},{"year":2009,"finding":"ATP7A traffics from the TGN to vesicles that partially overlap with phagosomal compartments in macrophages upon IFN-γ stimulation; siRNA silencing of ATP7A attenuates bactericidal killing, and copper-sensitive E. coli (ΔcopA) are hypersensitive to macrophage killing in an ATP7A-dependent manner, establishing ATP7A-mediated copper transport as a component of the macrophage bactericidal mechanism.","method":"siRNA knockdown, confocal microscopy, bacterial killing assays in RAW264.7 macrophages, 64Cu uptake","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — siRNA knockdown with specific bacterial killing phenotype, copper-sensitive bacterial mutant as mechanistic probe, multiple methods","pmids":["19808669"],"is_preprint":false},{"year":2009,"finding":"ATP7A is required for macrophage-mediated oxidation of LDL; siRNA knockdown of ATP7A in THP-1 macrophages attenuates LDL oxidation and reduces expression and enzymatic activity of cytosolic phospholipase A2α (cPLA2α), with reduced cPLA2α promoter activity, suggesting ATP7A transcriptionally regulates cPLA2α.","method":"siRNA knockdown, LDL oxidation assay, promoter activity assay, enzyme activity assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with specific molecular mechanism, single lab","pmids":["19965596"],"is_preprint":false},{"year":2010,"finding":"ATP7A missense mutations T994I and P1386S (causing distal motor neuropathy) show normal mRNA and protein levels but defective intracellular trafficking, with exaggerated plasma membrane localization and impaired endocytic retrieval to TGN; ATP7A(T994I) shows abnormal interaction with p97/VCP, and siRNA knockdown of p97/VCP corrects ATP7A(T994I) mislocalization; ATP7A(P1386S) places its C-terminal di-leucine endocytic motif extracellularly, impeding internalization.","method":"TIRF microscopy in patient fibroblasts, transfection of NSC-34 motor neurons, immunoprecipitation, siRNA knockdown, flow cytometry","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods including patient-derived cells and motor neuron models, functional rescue","pmids":["20170900"],"is_preprint":false},{"year":2011,"finding":"Clusterin and COMMD1 independently interact with ATP7A and ATP7B to facilitate their degradation: clusterin promotes lysosomal degradation and COMMD1 promotes proteasomal degradation; overexpression of either reduces endogenous ATP7A/B levels, knockdown increases them, and their interactions with ATP7A/B are neither competitive nor cooperative.","method":"Overexpression and siRNA knockdown, co-immunoprecipitation, lysosomal/proteasomal inhibitors, immunoblotting","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — bidirectional manipulation (OE + KD) with mechanistic pathway separation, multiple Cu-ATPase substrates","pmids":["22130675"],"is_preprint":false},{"year":2011,"finding":"The TIRF microscopy and flow cytometry analyses of ATP7A(T994I) and ATP7A(P1386S) mutations in patient fibroblasts and Hek293T cells further confirmed preferential plasma membrane accumulation and impaired endocytic retrieval; p97/VCP abnormally binds ATP7A(T994I) and its siRNA knockdown corrects mislocalization.","method":"Total internal reflection fluorescence microscopy, transfection, immunoprecipitation, siRNA, flow cytometry","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods in patient-derived and engineered cells","pmids":["22210628"],"is_preprint":false},{"year":2012,"finding":"ATP7A/B Cu-ATPases form a phosphoenzyme intermediate (E-P) in an ATP-dependent manner; unlike SERCA, ATP7A/B phosphoenzyme formation is slow and highly temperature-sensitive; ATP-dependent charge transfer occurs without Cu+/H+ exchange; copper-deprived ATP7A undergoes inactivating interaction of its N-metal binding extension with headpiece domains preventing reverse phosphorylation, which is relieved by deletion of the N-MBD.","method":"Solid supported membrane electrical measurements, pH variation experiments, charge transfer measurements, Glu-309 mutation comparison, N-MBD deletion","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro biochemical reconstitution with domain mutagenesis, mechanistic comparison with SERCA","pmids":["22854969"],"is_preprint":false},{"year":2013,"finding":"Cisplatin, carboplatin, and oxaliplatin activate Cu-ATPases ATP7A and ATP7B and undergo ATP-dependent translocation similar to copper; NMR and ESI-MS show that cisplatin binds the first N-terminal metal-binding domain of ATP7A (Mnk1) via cis-coordination of Cys19 and Cys22 sulfur atoms to the [Pt(NH3)2]2+ moiety.","method":"Solid supported membrane electrical measurements on COS-1 microsomes expressing recombinant ATP7A/B, NMR spectroscopy, ESI-MS","journal":"Angewandte Chemie (International ed. in English)","confidence":"High","confidence_rationale":"Tier 1 — in vitro electrophysiology plus NMR structure of drug-protein adduct","pmids":["24375922"],"is_preprint":false},{"year":2013,"finding":"Transcription factors Sp1 and Hif2α cooperatively induce ATP7A (Atp7a) gene expression during hypoxia/iron deficiency; four functional Sp1 binding sites in the Atp7a promoter are necessary for Hif2α-mediated induction; ChIP confirmed Sp1 binding to the Atp7a promoter in IEC-6 cells and rat duodenal enterocytes.","method":"Mithramycin inhibition, Sp1 overexpression, site-directed mutagenesis of promoter, ChIP, reporter assay in IEC-6 cells","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis + ChIP + functional reporter, single lab","pmids":["23814049"],"is_preprint":false},{"year":2014,"finding":"Cisplatin binds the first N-terminal soluble domain of ATP7A with cis-coordination of [Pt(NH3)2]2+ to Cys19 and Cys22; Car-Parrinello QM/MM simulations and computational spectroscopy validated against CD spectra and NMR chemical shifts provide the first quantitative 3D atomic view of platinum binding to ATP7A.","method":"ESI-MS, 1H/13C/15N NMR, QM/MM simulations, CD spectroscopy","journal":"Dalton transactions","confidence":"High","confidence_rationale":"Tier 1 — NMR structure determination with computational validation against experimental spectra","pmids":["24983998"],"is_preprint":false},{"year":2016,"finding":"Loss of ATP7A activity in Menkes patient fibroblasts and CRISPR/Cas9-inactivated 3T3-L1 cells causes copper accumulation in mitochondria leading to glutathione oxidation and elevated H2O2 in mitochondria (measured by GRX1-roGFP2 and HyPer sensors), markedly increasing sensitivity to glutathione depletion; elevated copper rather than H2O2 is the primary cause of glutathione oxidation.","method":"CRISPR/Cas9 inactivation, patient-derived fibroblasts, live-cell ratiometric sensors (GRX1-roGFP2, HyPer), MitoQ treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 — CRISPR KO plus patient cells, live quantitative imaging sensors, pharmacological rescue","pmids":["27226607"],"is_preprint":false},{"year":2017,"finding":"The ATP7A interactome (541 co-isolated proteins by immunoaffinity chromatography) includes subunits of the conserved oligomeric Golgi (COG) complex; COG-null cells show altered ATP7A and CTR1 content and localization, decreased total cellular copper, and impaired copper-dependent metabolic responses; genetic manipulation of ATP7A and COG subunits in Drosophila neurons alters synapse development and copper-induced mortality.","method":"ATP7A immunoaffinity chromatography/MS, COG-null cell analysis, subcellular fractionation, Drosophila genetics","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — MS interactome validated by genetic epistasis in two model systems","pmids":["28355134"],"is_preprint":false},{"year":2018,"finding":"Akt2 (protein kinase B beta) phosphorylates ATP7A at Ser1424/Ser1463/Ser1466 upon insulin stimulation, stabilizing ATP7A by preventing ubiquitination/proteasomal degradation and promoting its translocation to the plasma membrane in vascular smooth muscle cells, thereby enabling full activation of extracellular SOD3.","method":"Immunoprecipitation, in vitro kinase assay, mass spectrometry, Akt2-/- mice, constitutively active Akt, ATP7A overexpression rescue of SOD3 activity","journal":"Arteriosclerosis, thrombosis, and vascular biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro kinase assay + MS site identification + genetic mouse models + functional SOD3 rescue","pmids":["29301787"],"is_preprint":false},{"year":2019,"finding":"ATP7A is necessary for the enzymatic activity of lysyl oxidase (LOX) and LOXL copper-dependent metalloenzymes; siRNA silencing of ATP7A inhibits LOX activity in 4T1 cells and attenuates LOX-dependent FAK phosphorylation and myeloid cell lung recruitment in an orthotopic mouse breast cancer model, as well as Lewis lung carcinoma metastasis.","method":"siRNA knockdown, LOX activity assay, orthotopic mouse models, lung metastasis analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — loss-of-function with specific enzymatic activity readout validated in two in vivo models","pmids":["30890638"],"is_preprint":false},{"year":2020,"finding":"Caveolin-1 stabilizes ATP7A protein in vascular tissue by preventing its ubiquitination and proteasomal degradation; ATP7A binds Cav-1 and co-localizes with SOD3 in caveolae/lipid rafts; loss of Cav-1 reduces ATP7A protein (not mRNA) and SOD3 activity, causing endothelial dysfunction rescuable by SOD3 gene transfer or ATP7A-overexpressing transgenic mice.","method":"Cav-1-/- mice, immunoprecipitation, ubiquitination assay, SOD3 activity, vascular relaxation, gene transfer rescue","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 2 — genetic KO with molecular mechanism (ubiquitination) and functional rescue in vivo","pmids":["32936699"],"is_preprint":false},{"year":2021,"finding":"VEGF stimulates ATP7A translocation from the TGN to the plasma membrane where it binds VEGFR2, preventing autophagy-mediated lysosomal degradation of VEGFR2 by blocking p62/SQSTM1 binding to ubiquitinated VEGFR2; EC-specific ATP7A-deficient and ATP7Amut mice show impaired post-ischemic neovascularization and reduced VEGFR2 signaling.","method":"Inducible EC-specific knockout mice, ATP7Amut transgenic mice, co-immunoprecipitation, autophagy reporter transgenic mice (CAG-RFP-EGFP-LC3), VEGFR2 signaling assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic mouse models, direct protein interaction, mechanistic pathway with autophagy reporter","pmids":["34035268"],"is_preprint":false},{"year":2023,"finding":"In polarized epithelia, ATP7A and ATP7B reside on distinct TGN domains under low copper; upon copper elevation ATP7A traffics to the basolateral membrane while ATP7B traverses recycling and apical sorting endosomes to the apical membrane; AP-1 complex is required for sorting of both Cu-ATPases: AP-1A provides directionality and TGN retention, while AP-1B governs copper-independent ATP7B trafficking specifically.","method":"Pan-AP-1 knockout and AP-1A/AP-1B isoform-specific knockouts, mass spectrometry, confocal microscopy in polarized cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — isoform-specific genetic KOs with precise trafficking readouts, MS interactome","pmids":["38032054"],"is_preprint":false}],"current_model":"ATP7A is a P-type Cu(I)-transporting ATPase that forms a copper-activated phosphoenzyme intermediate and mediates ATP-dependent vectorial copper transport; it resides in the trans-Golgi network under basal conditions and undergoes copper-regulated, AP-1-dependent trafficking to the basolateral plasma membrane (or to phagosomal/VEGFR2-associated vesicles in specialized contexts), returning via Rac1-dependent, clathrin-independent endocytosis; it delivers copper to secretory cuproenzymes (including LOX, SOD3, and peptidylglycine amidating monooxygenase), protects mitochondria from copper-induced redox damage, mediates macrophage bactericidal copper delivery, and is stabilized by Akt2 phosphorylation and Caveolin-1 binding while being degraded via clusterin/lysosomal or COMMD1/proteasomal pathways."},"narrative":{"teleology":[{"year":1998,"claim":"Establishing the copper-dependent TGN-to-plasma-membrane trafficking cycle resolved where ATP7A operates and how cells regulate copper efflux directionally.","evidence":"Immunogold EM and confocal microscopy of stably transfected CHO-K1 cells showed TGN residence at basal copper and redistribution to vesicles/plasma membrane at elevated copper, with functional copper resistance proportional to expression level.","pmids":["9668172"],"confidence":"High","gaps":["Endocytic retrieval mechanism and sorting signals not yet identified","Whether trafficking occurs in polarized epithelial cells unknown"]},{"year":2003,"claim":"Identifying the Rac1-dependent, clathrin/caveolae-independent internalization pathway defined a novel endocytic route for a polytopic membrane transporter.","evidence":"Dominant-negative dynamin, Eps15, and caveolae inhibitors failed to block ATP7A internalization in transfected cells; constitutively active Rac1 inhibited retrieval, measured by flow cytometry.","pmids":["12812980"],"confidence":"High","gaps":["Coat proteins or adaptors mediating Rac1-dependent endocytosis of ATP7A not identified","Upstream signals activating Rac1 in this context unknown"]},{"year":2004,"claim":"Mapping the C-terminal di-leucine endocytic motif and N-terminal metal-binding domain requirements for copper-regulated basolateral trafficking dissected the molecular determinants controlling ATP7A directionality in polarized cells.","evidence":"Site-directed mutagenesis in polarized MDCK cells; L1487/L1488 mutations blocked endocytic retrieval; N-MBD deletions impaired copper-stimulated exit from TGN, assessed by confocal microscopy and surface biotinylation.","pmids":["15269005"],"confidence":"High","gaps":["Whether additional sorting motifs contribute in different epithelial contexts","Adaptor complexes mediating basolateral targeting not identified"]},{"year":2004,"claim":"Demonstrating that ATP7A sequesters platinum drugs into vesicular compartments revealed an unanticipated role in chemotherapy pharmacokinetics and established substrate promiscuity beyond copper.","evidence":"ICP-MS and vesicle fractionation in Menkes fibroblasts reconstituted with ATP7A showed increased vesicular cisplatin/carboplatin without enhanced nuclear delivery; copper but not platinum triggered relocalization.","pmids":["15213293"],"confidence":"High","gaps":["Structural basis for platinum binding to ATP7A not yet resolved","In vivo relevance to drug resistance unconfirmed"]},{"year":2007,"claim":"Biochemical reconstitution of purified full-length ATP7A in liposomes proved it is a bona fide Cu(I)-translocating ATPase with cooperative copper activation, placing it mechanistically alongside other P-type ATPases.","evidence":"Purified Sf9-expressed ATP7A formed vanadate-sensitive phosphoenzyme activated by Cu(I) (Hill coefficient 4.6), exhibited Cu(I)-dependent ATPase activity, and mediated 64Cu transport into liposomes.","pmids":["17009961"],"confidence":"High","gaps":["Full-length structural model unavailable","How cooperativity is achieved among six N-terminal metal-binding domains mechanistically undefined"]},{"year":2007,"claim":"Phenotypic analysis of mottled mouse alleles demonstrated that specific domains control distinct steps—ER exit, copper delivery, and trafficking—linking genotype to Menkes disease severity and establishing ATP7A's developmental role in axon outgrowth.","evidence":"Mutant ATP7A constructs corresponding to mottled alleles showed ER retention (mo11H), constitutive plasma membrane localization (Macular, Viable brindle), and reduced copper delivery; Mottled brindled mice exhibited disrupted olfactory axon projections.","pmids":["17483305","17215139"],"confidence":"High","gaps":["Specific cuproenzymes mediating ATP7A-dependent axon outgrowth not identified","Whether motor neuron pathology in human disease shares the same mechanism unclear"]},{"year":2009,"claim":"Linking ATP7A to macrophage bactericidal copper delivery expanded its role beyond biosynthetic copper loading to innate immune defense.","evidence":"IFN-γ stimulated ATP7A translocation to phagosome-adjacent vesicles in RAW264.7 macrophages; siRNA knockdown attenuated killing of copper-sensitive E. coli ΔcopA.","pmids":["19808669"],"confidence":"High","gaps":["Whether ATP7A directly pumps copper into the phagosome lumen or delivers via vesicle fusion","Relevance to in vivo human infection not tested"]},{"year":2010,"claim":"Characterizing distal motor neuropathy mutations T994I and P1386S as trafficking-defective alleles with preserved catalytic function revealed that aberrant plasma membrane retention (not loss of transport) causes a distinct clinical phenotype, and identified p97/VCP as an unexpected trafficking partner.","evidence":"TIRF microscopy in patient fibroblasts showed exaggerated surface accumulation; IP revealed abnormal p97/VCP binding to T994I; p97/VCP knockdown rescued mislocalization; P1386S placed the di-leucine motif extracellularly.","pmids":["20170900","22210628"],"confidence":"High","gaps":["How p97/VCP interaction normally facilitates ATP7A retrieval mechanistically undefined","Whether p97/VCP is a direct binding partner or acts through an adaptor unknown"]},{"year":2011,"claim":"Identification of clusterin (lysosomal) and COMMD1 (proteasomal) as independent degradation mediators for ATP7A defined dual proteolytic quality-control pathways governing transporter abundance.","evidence":"Bidirectional manipulation (overexpression and siRNA) in cultured cells with lysosomal/proteasomal inhibitors; co-IP confirmed distinct, non-competitive interactions with ATP7A.","pmids":["22130675"],"confidence":"High","gaps":["Ubiquitin ligase(s) linking COMMD1 to ATP7A ubiquitination not identified","Physiological signals controlling each degradation pathway unclear"]},{"year":2013,"claim":"NMR/ESI-MS structural determination of cisplatin binding to the first N-terminal metal-binding domain of ATP7A via Cys19/Cys22 cis-coordination provided an atomic-level explanation for platinum drug transport by copper ATPases.","evidence":"NMR and ESI-MS of Mnk1 domain incubated with cisplatin; electrophysiology on COS-1 microsomes showed ATP-dependent platinum translocation comparable to copper.","pmids":["24375922","24983998"],"confidence":"High","gaps":["Whether all six N-terminal domains bind platinum and their relative affinities unknown","In vivo contribution of ATP7A-mediated platinum efflux to clinical drug resistance not quantified"]},{"year":2016,"claim":"Demonstrating that ATP7A loss causes mitochondrial copper overload with consequent glutathione oxidation identified a cytoprotective role for ATP7A in maintaining mitochondrial redox homeostasis.","evidence":"CRISPR/Cas9 KO in 3T3-L1 cells and Menkes patient fibroblasts, live-cell GRX1-roGFP2 and HyPer sensors showed elevated mitochondrial glutathione oxidation and H₂O₂ driven primarily by copper accumulation.","pmids":["27226607"],"confidence":"High","gaps":["Mechanism by which ATP7A normally prevents mitochondrial copper accumulation (direct or indirect) not resolved","Whether mitochondrial redox imbalance contributes to Menkes neurodegeneration in vivo unknown"]},{"year":2018,"claim":"Identification of Akt2-mediated phosphorylation at three C-terminal serines as a stabilizing signal that prevents ATP7A ubiquitination and promotes plasma membrane translocation linked insulin signaling to copper-dependent SOD3 activation in vasculature.","evidence":"In vitro kinase assay, MS phosphosite mapping, Akt2−/− mice showed reduced ATP7A and SOD3 activity; constitutively active Akt rescued ATP7A stability.","pmids":["29301787"],"confidence":"High","gaps":["E3 ligase counteracting Akt2-mediated stabilization not identified","Whether other kinases regulate ATP7A trafficking in non-vascular contexts unknown"]},{"year":2020,"claim":"Caveolin-1 was established as a second stabilizing partner for ATP7A, preventing its ubiquitination in vascular tissue and coupling copper delivery to SOD3 within caveolae/lipid rafts.","evidence":"Cav-1−/− mice showed reduced ATP7A protein but not mRNA, increased ubiquitination, decreased SOD3 activity, and endothelial dysfunction rescued by SOD3 gene transfer or ATP7A overexpression.","pmids":["32936699"],"confidence":"High","gaps":["Whether Cav-1 and Akt2 act on the same or distinct ubiquitin signals on ATP7A","Structural basis of Cav-1/ATP7A interaction not defined"]},{"year":2021,"claim":"Discovery that ATP7A binds VEGFR2 at the plasma membrane and shields it from p62/SQSTM1-mediated autophagic degradation revealed a copper-transport-independent scaffolding function critical for post-ischemic neovascularization.","evidence":"Inducible EC-specific ATP7A KO and ATP7Amut mice showed impaired VEGFR2 signaling and neovascularization; co-IP showed ATP7A–VEGFR2 interaction; autophagy reporter mice confirmed increased VEGFR2 autophagic flux upon ATP7A loss.","pmids":["34035268"],"confidence":"High","gaps":["Whether the scaffolding function requires copper occupancy or is purely structural","Domain on ATP7A mediating VEGFR2 binding not mapped"]},{"year":2023,"claim":"Resolving AP-1 adaptor complex isoform-specific roles in ATP7A versus ATP7B sorting from the TGN explained how two homologous transporters achieve opposite polarity in the same polarized epithelial cell.","evidence":"Pan-AP-1, AP-1A, and AP-1B isoform-specific knockouts in polarized cells; MS interactome; confocal imaging showed AP-1A provides TGN retention and directionality for both ATPases, while AP-1B specifically controls copper-independent ATP7B trafficking.","pmids":["38032054"],"confidence":"High","gaps":["Motifs on ATP7A recognized by AP-1A not mapped","Whether post-translational modifications modulate AP-1 interaction affinity"]},{"year":null,"claim":"A high-resolution full-length structure of ATP7A, the identity of the E3 ubiquitin ligase(s) governing its turnover, the mechanism linking ATP7A to mitochondrial copper homeostasis, and the structural basis of its non-transport scaffolding interaction with VEGFR2 remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No full-length atomic structure of ATP7A available","E3 ligase(s) mediating ATP7A ubiquitination not identified","How ATP7A prevents mitochondrial copper accumulation mechanistically unclear","Domain mapping of the ATP7A–VEGFR2 scaffolding interaction not performed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[8,15,16]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[8,3,10]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[8,15]}],"localization":[{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,4,25]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,12,21,24]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,4,10]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[8,0,4,10]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,2,25]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[10]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[13,21,23]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[8,19]}],"complexes":[],"partners":["VEGFR2","CAV1","AKT2","COMMD1","CLU","VCP","GLRX","RAC1"],"other_free_text":[]},"mechanistic_narrative":"ATP7A is a P-type Cu(I)-transporting ATPase that forms a copper-activated phosphoenzyme intermediate with cooperative high-affinity Cu(I) binding (K0.5 ~0.6 µM) and mediates ATP-dependent vectorial copper transport across membranes, supplying copper to secretory cuproenzymes including lysyl oxidase, SOD3, and peptidylglycine α-amidating monooxygenase [PMID:17009961, PMID:30890638, PMID:29301787]. Under basal conditions ATP7A resides in the trans-Golgi network and undergoes copper-stimulated, AP-1-dependent trafficking to the basolateral plasma membrane, returning via a Rac1-dependent, clathrin-independent endocytic pathway that requires a C-terminal di-leucine motif; in specialized contexts it relocates to phagosomal compartments (macrophage bactericidal copper delivery) or associates with VEGFR2 at the plasma membrane to protect the receptor from autophagic degradation [PMID:9668172, PMID:12812980, PMID:15269005, PMID:38032054, PMID:19808669, PMID:34035268]. ATP7A protein stability is maintained by Akt2 phosphorylation and Caveolin-1 binding, which prevent ubiquitination-dependent proteasomal degradation, while clusterin promotes its lysosomal turnover and COMMD1 its proteasomal turnover; loss of ATP7A causes mitochondrial copper accumulation with glutathione oxidation, impairs axon outgrowth, and underlies Menkes disease and an allelic distal motor neuropathy linked to trafficking-defective missense mutations [PMID:29301787, PMID:32936699, PMID:22130675, PMID:27226607, PMID:17483305, PMID:20170900]. ATP7A also binds and translocates platinum-based chemotherapeutic agents via its N-terminal CxxC motifs, modulating cisplatin pharmacodynamics [PMID:15213293, PMID:24375922]."},"prefetch_data":{"uniprot":{"accession":"Q04656","full_name":"Copper-transporting ATPase 1","aliases":["Copper pump 1","Menkes disease-associated protein"],"length_aa":1500,"mass_kda":163.4,"function":"ATP-driven copper (Cu(+)) ion pump that plays an important role in intracellular copper ion homeostasis (PubMed:10419525, PubMed:11092760, PubMed:28389643). Within a catalytic cycle, acquires Cu(+) ion from donor protein on the cytoplasmic side of the membrane and delivers it to acceptor protein on the lumenal side. The transfer of Cu(+) ion across the membrane is coupled to ATP hydrolysis and is associated with a transient phosphorylation that shifts the pump conformation from inward-facing to outward-facing state (PubMed:10419525, PubMed:19453293, PubMed:19917612, PubMed:28389643, PubMed:31283225). Under physiological conditions, at low cytosolic copper concentration, it is localized at the trans-Golgi network (TGN) where it transfers Cu(+) ions to cuproenzymes of the secretory pathway (PubMed:11092760, PubMed:28389643). Upon elevated cytosolic copper concentrations, it relocalizes to the plasma membrane where it is responsible for the export of excess Cu(+) ions (PubMed:10419525, PubMed:28389643). May play a dual role in neuron function and survival by regulating cooper efflux and neuronal transmission at the synapse as well as by supplying Cu(+) ions to enzymes such as PAM, TYR and SOD3 (By similarity) (PubMed:28389643). In the melanosomes of pigmented cells, provides copper cofactor to TYR to form an active TYR holoenzyme for melanin biosynthesis (By similarity)","subcellular_location":"Endoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/Q04656/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATP7A","classification":"Not Classified","n_dependent_lines":66,"n_total_lines":1208,"dependency_fraction":0.054635761589403975},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ATP7A","total_profiled":1310},"omim":[{"mim_id":"620009","title":"KERATODERMA-ICHTHYOSIS-DEAFNESS SYNDROME, AUTOSOMAL RECESSIVE; KDIDAR","url":"https://www.omim.org/entry/620009"},{"mim_id":"614758","title":"DYNACTIN 4; DCTN4","url":"https://www.omim.org/entry/614758"},{"mim_id":"614482","title":"HUPPKE-BRENDEL SYNDROME; HPBDS","url":"https://www.omim.org/entry/614482"},{"mim_id":"610232","title":"ATPase 13A3; ATP13A3","url":"https://www.omim.org/entry/610232"},{"mim_id":"609313","title":"MEDNIK SYNDROME; MEDNIK","url":"https://www.omim.org/entry/609313"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Golgi apparatus","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ATP7A"},"hgnc":{"alias_symbol":[],"prev_symbol":["MNK"]},"alphafold":{"accession":"Q04656","domains":[{"cath_id":"3.30.70.100","chopping":"9-83","consensus_level":"high","plddt":85.5001,"start":9,"end":83},{"cath_id":"-","chopping":"91-110_118-149","consensus_level":"high","plddt":72.2783,"start":91,"end":149},{"cath_id":"3.30.70.100","chopping":"172-244","consensus_level":"high","plddt":83.963,"start":172,"end":244},{"cath_id":"3.30.70.100","chopping":"277-348","consensus_level":"high","plddt":80.5385,"start":277,"end":348},{"cath_id":"3.30.70.100","chopping":"379-387_408-446","consensus_level":"medium","plddt":86.214,"start":379,"end":446},{"cath_id":"3.30.70.100","chopping":"489-637","consensus_level":"medium","plddt":79.684,"start":489,"end":637},{"cath_id":"2.70.150.10","chopping":"821-917","consensus_level":"medium","plddt":82.1081,"start":821,"end":917},{"cath_id":"3.40.50.1000","chopping":"1013-1050_1234-1424","consensus_level":"medium","plddt":83.6741,"start":1013,"end":1424},{"cath_id":"3.40.1110.10","chopping":"1054-1137_1176-1231","consensus_level":"medium","plddt":82.0456,"start":1054,"end":1231},{"cath_id":"1.20.120","chopping":"638-812","consensus_level":"medium","plddt":75.6131,"start":638,"end":812}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04656","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q04656-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q04656-F1-predicted_aligned_error_v6.png","plddt_mean":73.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ATP7A","jax_strain_url":"https://www.jax.org/strain/search?query=ATP7A"},"sequence":{"accession":"Q04656","fasta_url":"https://rest.uniprot.org/uniprotkb/Q04656.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q04656/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q04656"}},"corpus_meta":[{"pmid":"21221114","id":"PMC_21221114","title":"ATP7A-related copper transport diseases-emerging concepts and future trends.","date":"2011","source":"Nature reviews. Neurology","url":"https://pubmed.ncbi.nlm.nih.gov/21221114","citation_count":420,"is_preprint":false},{"pmid":"19808669","id":"PMC_19808669","title":"A role for the ATP7A copper-transporting ATPase in macrophage bactericidal activity.","date":"2009","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19808669","citation_count":411,"is_preprint":false},{"pmid":"17531189","id":"PMC_17531189","title":"Trafficking of the copper-ATPases, ATP7A and ATP7B: role in copper homeostasis.","date":"2007","source":"Archives of biochemistry and biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/17531189","citation_count":352,"is_preprint":false},{"pmid":"15269138","id":"PMC_15269138","title":"Increased expression of the copper efflux transporter ATP7A mediates resistance to cisplatin, carboplatin, and oxaliplatin in ovarian cancer cells.","date":"2004","source":"Clinical cancer research : an official journal of the American Association for Cancer Research","url":"https://pubmed.ncbi.nlm.nih.gov/15269138","citation_count":276,"is_preprint":false},{"pmid":"30890638","id":"PMC_30890638","title":"ATP7A delivers copper to the lysyl oxidase family of enzymes and promotes tumorigenesis and metastasis.","date":"2019","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/30890638","citation_count":192,"is_preprint":false},{"pmid":"15075293","id":"PMC_15075293","title":"Phosphorylation of eIF4E by Mnk-1 enhances HSV-1 translation and replication in quiescent cells.","date":"2004","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/15075293","citation_count":164,"is_preprint":false},{"pmid":"25225600","id":"PMC_25225600","title":"Mnk kinase pathway: Cellular functions and biological outcomes.","date":"2014","source":"World journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25225600","citation_count":139,"is_preprint":false},{"pmid":"20170900","id":"PMC_20170900","title":"Missense mutations in the copper transporter gene ATP7A cause X-linked distal hereditary motor neuropathy.","date":"2010","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/20170900","citation_count":133,"is_preprint":false},{"pmid":"17724079","id":"PMC_17724079","title":"Inhibition of mammalian target of rapamycin induces phosphatidylinositol 3-kinase-dependent and Mnk-mediated eukaryotic translation initiation factor 4E phosphorylation.","date":"2007","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17724079","citation_count":129,"is_preprint":false},{"pmid":"23986700","id":"PMC_23986700","title":"Role of the P-Type ATPases, ATP7A and ATP7B in brain copper homeostasis.","date":"2013","source":"Frontiers in aging neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/23986700","citation_count":129,"is_preprint":false},{"pmid":"23737503","id":"PMC_23737503","title":"Targeting of the MNK-eIF4E axis in blast crisis chronic myeloid leukemia inhibits leukemia stem cell function.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/23737503","citation_count":125,"is_preprint":false},{"pmid":"12361566","id":"PMC_12361566","title":"Activation of a meiotic checkpoint during Drosophila oogenesis regulates the translation of Gurken through Chk2/Mnk.","date":"2002","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/12361566","citation_count":120,"is_preprint":false},{"pmid":"15213293","id":"PMC_15213293","title":"Modulation of the cellular pharmacology of cisplatin and its analogs by the copper exporters ATP7A and ATP7B.","date":"2004","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/15213293","citation_count":119,"is_preprint":false},{"pmid":"28674170","id":"PMC_28674170","title":"The MNK-eIF4E Signaling Axis Contributes to Injury-Induced Nociceptive Plasticity and the Development of Chronic Pain.","date":"2017","source":"The Journal of neuroscience : the official journal of the Society for Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/28674170","citation_count":111,"is_preprint":false},{"pmid":"23281160","id":"PMC_23281160","title":"An overview and update of ATP7A mutations leading to Menkes disease and occipital horn syndrome.","date":"2013","source":"Human mutation","url":"https://pubmed.ncbi.nlm.nih.gov/23281160","citation_count":101,"is_preprint":false},{"pmid":"18000748","id":"PMC_18000748","title":"Copper-transporting ATPases ATP7A and ATP7B: cousins, not twins.","date":"2007","source":"Journal of bioenergetics and biomembranes","url":"https://pubmed.ncbi.nlm.nih.gov/18000748","citation_count":91,"is_preprint":false},{"pmid":"15269005","id":"PMC_15269005","title":"Signals regulating trafficking of Menkes (MNK; ATP7A) copper-translocating P-type ATPase in polarized MDCK cells.","date":"2004","source":"American journal of physiology. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/15269005","citation_count":91,"is_preprint":false},{"pmid":"23509154","id":"PMC_23509154","title":"Inhibition of Mnk kinase activity by cercosporamide and suppressive effects on acute myeloid leukemia precursors.","date":"2013","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/23509154","citation_count":89,"is_preprint":false},{"pmid":"27527252","id":"PMC_27527252","title":"Tuning Specific Translation in Cancer Metastasis and Synaptic Memory: Control at the MNK-eIF4E Axis.","date":"2016","source":"Trends in biochemical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/27527252","citation_count":84,"is_preprint":false},{"pmid":"16317117","id":"PMC_16317117","title":"Copper exposure induces trafficking of the menkes protein in intestinal epithelium of ATP7A transgenic mice.","date":"2005","source":"The Journal of nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/16317117","citation_count":81,"is_preprint":false},{"pmid":"24375922","id":"PMC_24375922","title":"Translocation of platinum anticancer drugs by human copper ATPases ATP7A and ATP7B.","date":"2013","source":"Angewandte Chemie (International ed. in English)","url":"https://pubmed.ncbi.nlm.nih.gov/24375922","citation_count":78,"is_preprint":false},{"pmid":"17215139","id":"PMC_17215139","title":"ATP7A (Menkes protein) functions in axonal targeting and synaptogenesis.","date":"2007","source":"Molecular and cellular neurosciences","url":"https://pubmed.ncbi.nlm.nih.gov/17215139","citation_count":74,"is_preprint":false},{"pmid":"9668172","id":"PMC_9668172","title":"Functional analysis and intracellular localization of the human menkes protein (MNK) stably expressed from a cDNA construct in Chinese hamster ovary cells (CHO-K1).","date":"1998","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9668172","citation_count":73,"is_preprint":false},{"pmid":"33328217","id":"PMC_33328217","title":"MNK Inhibition Sensitizes KRAS-Mutant Colorectal Cancer to mTORC1 Inhibition by Reducing eIF4E Phosphorylation and c-MYC Expression.","date":"2020","source":"Cancer discovery","url":"https://pubmed.ncbi.nlm.nih.gov/33328217","citation_count":72,"is_preprint":false},{"pmid":"22130675","id":"PMC_22130675","title":"Clusterin and COMMD1 independently regulate degradation of the mammalian copper ATPases ATP7A and ATP7B.","date":"2011","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22130675","citation_count":72,"is_preprint":false},{"pmid":"16549268","id":"PMC_16549268","title":"Developmental changes in the expression of ATP7A during a critical period in postnatal neurodevelopment.","date":"2006","source":"Neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/16549268","citation_count":71,"is_preprint":false},{"pmid":"34035268","id":"PMC_34035268","title":"The P-type ATPase transporter ATP7A promotes angiogenesis by limiting autophagic degradation of VEGFR2.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34035268","citation_count":70,"is_preprint":false},{"pmid":"7490081","id":"PMC_7490081","title":"Molecular structure of the Menkes disease gene (ATP7A).","date":"1995","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/7490081","citation_count":67,"is_preprint":false},{"pmid":"18032482","id":"PMC_18032482","title":"MNK kinases regulate multiple TLR pathways and innate proinflammatory cytokines in macrophages.","date":"2007","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/18032482","citation_count":64,"is_preprint":false},{"pmid":"11241493","id":"PMC_11241493","title":"ATP7A gene mutations in 16 patients with Menkes disease and a patient with occipital horn syndrome.","date":"2001","source":"American journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11241493","citation_count":63,"is_preprint":false},{"pmid":"33917579","id":"PMC_33917579","title":"ATP7A-Regulated Enzyme Metalation and Trafficking in the Menkes Disease Puzzle.","date":"2021","source":"Biomedicines","url":"https://pubmed.ncbi.nlm.nih.gov/33917579","citation_count":61,"is_preprint":false},{"pmid":"28355134","id":"PMC_28355134","title":"The interactome of the copper transporter ATP7A belongs to a network of neurodevelopmental and neurodegeneration factors.","date":"2017","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/28355134","citation_count":60,"is_preprint":false},{"pmid":"28819394","id":"PMC_28819394","title":"A Role for The ATP7A Copper Transporter in Tumorigenesis and Cisplatin Resistance.","date":"2017","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/28819394","citation_count":56,"is_preprint":false},{"pmid":"27226607","id":"PMC_27226607","title":"The Activity of Menkes Disease Protein ATP7A Is Essential for Redox Balance in Mitochondria.","date":"2016","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/27226607","citation_count":56,"is_preprint":false},{"pmid":"17588765","id":"PMC_17588765","title":"Altered ATP7A expression and other compensatory responses in a murine model of Menkes disease.","date":"2007","source":"Neurobiology of disease","url":"https://pubmed.ncbi.nlm.nih.gov/17588765","citation_count":55,"is_preprint":false},{"pmid":"27806319","id":"PMC_27806319","title":"Ammonium tetrathiomolybdate treatment targets the copper transporter ATP7A and enhances sensitivity of breast cancer to cisplatin.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27806319","citation_count":55,"is_preprint":false},{"pmid":"16884690","id":"PMC_16884690","title":"Copper-dependent interaction of glutaredoxin with the N termini of the copper-ATPases (ATP7A and ATP7B) defective in Menkes and Wilson diseases.","date":"2006","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16884690","citation_count":53,"is_preprint":false},{"pmid":"10079817","id":"PMC_10079817","title":"Mutation spectrum of ATP7A, the gene defective in Menkes disease.","date":"1999","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/10079817","citation_count":48,"is_preprint":false},{"pmid":"29351901","id":"PMC_29351901","title":"XIAP Regulation by MNK Links MAPK and NFκB Signaling to Determine an Aggressive Breast Cancer Phenotype.","date":"2018","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/29351901","citation_count":48,"is_preprint":false},{"pmid":"21949767","id":"PMC_21949767","title":"Simultaneous inhibition of mTOR-containing complex 1 (mTORC1) and MNK induces apoptosis of cutaneous T-cell lymphoma (CTCL) cells.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21949767","citation_count":46,"is_preprint":false},{"pmid":"31590180","id":"PMC_31590180","title":"Reversal of peripheral nerve injury-induced neuropathic pain and cognitive dysfunction via genetic and tomivosertib targeting of MNK.","date":"2019","source":"Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/31590180","citation_count":45,"is_preprint":false},{"pmid":"27289018","id":"PMC_27289018","title":"Inhibition of MNK pathways enhances cancer cell response to chemotherapy with temozolomide and targeted radionuclide therapy.","date":"2016","source":"Cellular signalling","url":"https://pubmed.ncbi.nlm.nih.gov/27289018","citation_count":44,"is_preprint":false},{"pmid":"26165234","id":"PMC_26165234","title":"Discovery of a BTK/MNK dual inhibitor for lymphoma and leukemia.","date":"2015","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/26165234","citation_count":42,"is_preprint":false},{"pmid":"16397091","id":"PMC_16397091","title":"Alteration of copper physiology in mice overexpressing the human Menkes protein ATP7A.","date":"2006","source":"American journal of physiology. Regulatory, integrative and comparative physiology","url":"https://pubmed.ncbi.nlm.nih.gov/16397091","citation_count":42,"is_preprint":false},{"pmid":"22210628","id":"PMC_22210628","title":"Altered intracellular localization and valosin-containing protein (p97 VCP) interaction underlie ATP7A-related distal motor neuropathy.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22210628","citation_count":41,"is_preprint":false},{"pmid":"29301787","id":"PMC_29301787","title":"Akt2 (Protein Kinase B Beta) Stabilizes ATP7A, a Copper Transporter for Extracellular Superoxide Dismutase, in Vascular Smooth Muscle: Novel Mechanism to Limit Endothelial Dysfunction in Type 2 Diabetes Mellitus.","date":"2018","source":"Arteriosclerosis, thrombosis, and vascular biology","url":"https://pubmed.ncbi.nlm.nih.gov/29301787","citation_count":41,"is_preprint":false},{"pmid":"35136028","id":"PMC_35136028","title":"Exosome-mediated miR-7-5p delivery enhances the anticancer effect of Everolimus via blocking MNK/eIF4E axis in non-small cell lung cancer.","date":"2022","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/35136028","citation_count":41,"is_preprint":false},{"pmid":"28271598","id":"PMC_28271598","title":"Dynamics of the metal binding domains and regulation of the human copper transporters ATP7B and ATP7A.","date":"2017","source":"IUBMB life","url":"https://pubmed.ncbi.nlm.nih.gov/28271598","citation_count":40,"is_preprint":false},{"pmid":"33892273","id":"PMC_33892273","title":"Progress in developing MNK inhibitors.","date":"2021","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/33892273","citation_count":39,"is_preprint":false},{"pmid":"31921404","id":"PMC_31921404","title":"TSC patient-derived isogenic neural progenitor cells reveal altered early neurodevelopmental phenotypes and rapamycin-induced MNK-eIF4E signaling.","date":"2020","source":"Molecular autism","url":"https://pubmed.ncbi.nlm.nih.gov/31921404","citation_count":37,"is_preprint":false},{"pmid":"12812980","id":"PMC_12812980","title":"The Menkes disease ATPase (ATP7A) is internalized via a Rac1-regulated, clathrin- and caveolae-independent pathway.","date":"2003","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12812980","citation_count":37,"is_preprint":false},{"pmid":"34533957","id":"PMC_34533957","title":"Update on the Development of MNK Inhibitors as Therapeutic Agents.","date":"2021","source":"Journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34533957","citation_count":36,"is_preprint":false},{"pmid":"27926520","id":"PMC_27926520","title":"Inhibiting the MNK-eIF4E-β-catenin axis increases the responsiveness of aggressive breast cancer cells to chemotherapy.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27926520","citation_count":36,"is_preprint":false},{"pmid":"29333545","id":"PMC_29333545","title":"Dynamic changes in copper homeostasis and post-transcriptional regulation of Atp7a during myogenic differentiation.","date":"2018","source":"Metallomics : integrated biometal science","url":"https://pubmed.ncbi.nlm.nih.gov/29333545","citation_count":36,"is_preprint":false},{"pmid":"28115001","id":"PMC_28115001","title":"Host Cell Copper Transporters CTR1 and ATP7A are important for Influenza A virus replication.","date":"2017","source":"Virology journal","url":"https://pubmed.ncbi.nlm.nih.gov/28115001","citation_count":35,"is_preprint":false},{"pmid":"29594361","id":"PMC_29594361","title":"MircroRNA-139 sensitizes ovarian cancer cell to cisplatin-based chemotherapy through regulation of ATP7A/B.","date":"2018","source":"Cancer chemotherapy and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/29594361","citation_count":35,"is_preprint":false},{"pmid":"23814049","id":"PMC_23814049","title":"Transcription factors Sp1 and Hif2α mediate induction of the copper-transporting ATPase (Atp7a) gene in intestinal epithelial cells during hypoxia.","date":"2013","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23814049","citation_count":35,"is_preprint":false},{"pmid":"22854969","id":"PMC_22854969","title":"Distinctive features of catalytic and transport mechanisms in mammalian sarco-endoplasmic reticulum Ca2+ ATPase (SERCA) and Cu+ (ATP7A/B) ATPases.","date":"2012","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/22854969","citation_count":35,"is_preprint":false},{"pmid":"27364770","id":"PMC_27364770","title":"MNK Inhibition Disrupts Mesenchymal Glioma Stem Cells and Prolongs Survival in a Mouse Model of Glioblastoma.","date":"2016","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/27364770","citation_count":34,"is_preprint":false},{"pmid":"26317997","id":"PMC_26317997","title":"Inhibition of mTORC1 Enhances the Translation of Chikungunya Proteins via the Activation of the MnK/eIF4E Pathway.","date":"2015","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/26317997","citation_count":34,"is_preprint":false},{"pmid":"28766096","id":"PMC_28766096","title":"Inhibiting ERK/Mnk/eIF4E broadly sensitizes ovarian cancer response to chemotherapy.","date":"2017","source":"Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico","url":"https://pubmed.ncbi.nlm.nih.gov/28766096","citation_count":34,"is_preprint":false},{"pmid":"8923001","id":"PMC_8923001","title":"A repeated element in the regulatory region of the MNK gene and its deletion in a patient with occipital horn syndrome.","date":"1996","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8923001","citation_count":34,"is_preprint":false},{"pmid":"15234964","id":"PMC_15234964","title":"Phosphorylation of Mnk1 by caspase-activated Pak2/gamma-PAK inhibits phosphorylation and interaction of eIF4G with Mnk.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15234964","citation_count":34,"is_preprint":false},{"pmid":"32519575","id":"PMC_32519575","title":"IL-6 induced upregulation of T-type Ca2+ currents and sensitization of DRG nociceptors is attenuated by MNK inhibition.","date":"2020","source":"Journal of neurophysiology","url":"https://pubmed.ncbi.nlm.nih.gov/32519575","citation_count":34,"is_preprint":false},{"pmid":"27094611","id":"PMC_27094611","title":"Dual targeting of eIF4E by blocking MNK and mTOR pathways in leukemia.","date":"2016","source":"Cytokine","url":"https://pubmed.ncbi.nlm.nih.gov/27094611","citation_count":33,"is_preprint":false},{"pmid":"17009961","id":"PMC_17009961","title":"Purification and membrane reconstitution of catalytically active Menkes copper-transporting P-type ATPase (MNK; ATP7A).","date":"2007","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/17009961","citation_count":33,"is_preprint":false},{"pmid":"20664001","id":"PMC_20664001","title":"Negative regulatory effects of Mnk kinases in the generation of chemotherapy-induced antileukemic responses.","date":"2010","source":"Molecular pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/20664001","citation_count":33,"is_preprint":false},{"pmid":"27159396","id":"PMC_27159396","title":"Cotargeting MNK and MEK kinases induces the regression of NF1-mutant cancers.","date":"2016","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/27159396","citation_count":32,"is_preprint":false},{"pmid":"21149447","id":"PMC_21149447","title":"Essential role for Mnk kinases in type II interferon (IFNgamma) signaling and its suppressive effects on normal hematopoiesis.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21149447","citation_count":32,"is_preprint":false},{"pmid":"29323792","id":"PMC_29323792","title":"The retinamide VNLG-152 inhibits f-AR/AR-V7 and MNK-eIF4E signaling pathways to suppress EMT and castration-resistant prostate cancer xenograft growth.","date":"2018","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/29323792","citation_count":31,"is_preprint":false},{"pmid":"35907138","id":"PMC_35907138","title":"Circular RNA circPBX3 promotes cisplatin resistance of ovarian cancer cells via interacting with IGF2BP2 to stabilize ATP7A mRNA expression.","date":"2022","source":"Human cell","url":"https://pubmed.ncbi.nlm.nih.gov/35907138","citation_count":31,"is_preprint":false},{"pmid":"20836889","id":"PMC_20836889","title":"Differential expression of ATP7A, ATP7B and CTR1 in adult rat dorsal root ganglion tissue.","date":"2010","source":"Molecular pain","url":"https://pubmed.ncbi.nlm.nih.gov/20836889","citation_count":31,"is_preprint":false},{"pmid":"16051599","id":"PMC_16051599","title":"A single PDZ domain protein interacts with the Menkes copper ATPase, ATP7A. A new protein implicated in copper homeostasis.","date":"2005","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16051599","citation_count":31,"is_preprint":false},{"pmid":"14977365","id":"PMC_14977365","title":"Studies on endocytic mechanisms of the Menkes copper-translocating P-type ATPase (ATP7A; MNK). Endocytosis of the Menkes protein.","date":"2004","source":"Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine","url":"https://pubmed.ncbi.nlm.nih.gov/14977365","citation_count":29,"is_preprint":false},{"pmid":"39394530","id":"PMC_39394530","title":"Sirtuin 7 ameliorates cuproptosis, myocardial remodeling and heart dysfunction in hypertension through the modulation of YAP/ATP7A signaling.","date":"2024","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/39394530","citation_count":27,"is_preprint":false},{"pmid":"17483305","id":"PMC_17483305","title":"Phenotypic diversity of Menkes disease in mottled mice is associated with defects in localisation and trafficking of the ATP7A protein.","date":"2007","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17483305","citation_count":27,"is_preprint":false},{"pmid":"24754450","id":"PMC_24754450","title":"ATP7A trafficking and mechanisms underlying the distal motor neuropathy induced by mutations in ATP7A.","date":"2014","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/24754450","citation_count":26,"is_preprint":false},{"pmid":"12372948","id":"PMC_12372948","title":"Expression in mouse kidney of membrane copper transporters Atp7a and Atp7b.","date":"2002","source":"Nephron","url":"https://pubmed.ncbi.nlm.nih.gov/12372948","citation_count":26,"is_preprint":false},{"pmid":"24174620","id":"PMC_24174620","title":"Silencing the Menkes copper-transporting ATPase (Atp7a) gene in rat intestinal epithelial (IEC-6) cells increases iron flux via transcriptional induction of ferroportin 1 (Fpn1).","date":"2013","source":"The Journal of nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/24174620","citation_count":26,"is_preprint":false},{"pmid":"33359139","id":"PMC_33359139","title":"The M1311V variant of ATP7A is associated with impaired trafficking and copper homeostasis in models of motor neuron disease.","date":"2020","source":"Neurobiology of disease","url":"https://pubmed.ncbi.nlm.nih.gov/33359139","citation_count":26,"is_preprint":false},{"pmid":"32712434","id":"PMC_32712434","title":"Disabling MNK protein kinases promotes oxidative metabolism and protects against diet-induced obesity.","date":"2020","source":"Molecular metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/32712434","citation_count":25,"is_preprint":false},{"pmid":"28841037","id":"PMC_28841037","title":"Dual abrogation of MNK and mTOR: a novel therapeutic approach for the treatment of aggressive cancers.","date":"2017","source":"Future medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28841037","citation_count":25,"is_preprint":false},{"pmid":"24316150","id":"PMC_24316150","title":"Involvement of CTR1 and ATP7A in lead (Pb)-induced copper (Cu) accumulation in choroidal epithelial cells.","date":"2013","source":"Toxicology letters","url":"https://pubmed.ncbi.nlm.nih.gov/24316150","citation_count":25,"is_preprint":false},{"pmid":"24983998","id":"PMC_24983998","title":"Platination of the copper transporter ATP7A involved in anticancer drug resistance.","date":"2014","source":"Dalton transactions (Cambridge, England : 2003)","url":"https://pubmed.ncbi.nlm.nih.gov/24983998","citation_count":25,"is_preprint":false},{"pmid":"24735419","id":"PMC_24735419","title":"Translational research investigations on ATP7A: an important human copper ATPase.","date":"2014","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/24735419","citation_count":24,"is_preprint":false},{"pmid":"27462781","id":"PMC_27462781","title":"Inhibition of Mnk enhances apoptotic activity of cytarabine in acute myeloid leukemia cells.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27462781","citation_count":24,"is_preprint":false},{"pmid":"34747666","id":"PMC_34747666","title":"MiR-495 Inhibits Cisplatin Resistance and Angiogenesis in Esophageal Cancer by Targeting ATP7A.","date":"2021","source":"Technology in cancer research & treatment","url":"https://pubmed.ncbi.nlm.nih.gov/34747666","citation_count":24,"is_preprint":false},{"pmid":"28087669","id":"PMC_28087669","title":"The Role of the p38-MNK-eIF4E Signaling Axis in TNF Production Downstream of the NOD1 Receptor.","date":"2017","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/28087669","citation_count":24,"is_preprint":false},{"pmid":"7959788","id":"PMC_7959788","title":"Analysis of Mnk, the murine homologue of the locus for Menkes disease, in normal and mottled (Mo) mice.","date":"1994","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/7959788","citation_count":24,"is_preprint":false},{"pmid":"29581834","id":"PMC_29581834","title":"Synergistic effects of inhibiting the MNK-eIF4E and PI3K/AKT/ mTOR pathways on cell migration in MDA-MB-231 cells.","date":"2018","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29581834","citation_count":23,"is_preprint":false},{"pmid":"25431995","id":"PMC_25431995","title":"Probing the binding mechanism of Mnk inhibitors by docking and molecular dynamics simulations.","date":"2014","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/25431995","citation_count":23,"is_preprint":false},{"pmid":"17695505","id":"PMC_17695505","title":"Effect of copper and role of the copper transporters ATP7A and CTR1 in intracellular accumulation of cisplatin.","date":"2007","source":"Anticancer research","url":"https://pubmed.ncbi.nlm.nih.gov/17695505","citation_count":23,"is_preprint":false},{"pmid":"19965596","id":"PMC_19965596","title":"Participation of ATP7A in macrophage mediated oxidation of LDL.","date":"2009","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/19965596","citation_count":23,"is_preprint":false},{"pmid":"26408454","id":"PMC_26408454","title":"An integrated approach for discovery of highly potent and selective Mnk inhibitors: Screening, synthesis and SAR analysis.","date":"2015","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/26408454","citation_count":22,"is_preprint":false},{"pmid":"32936699","id":"PMC_32936699","title":"Caveolin-1 stabilizes ATP7A, a copper transporter for extracellular SOD, in vascular tissue to maintain endothelial function.","date":"2020","source":"American journal of physiology. Cell physiology","url":"https://pubmed.ncbi.nlm.nih.gov/32936699","citation_count":22,"is_preprint":false},{"pmid":"17903173","id":"PMC_17903173","title":"Loss of MNK function sensitizes fibroblasts to serum-withdrawal induced apoptosis.","date":"2007","source":"Genes to cells : devoted to molecular & cellular mechanisms","url":"https://pubmed.ncbi.nlm.nih.gov/17903173","citation_count":20,"is_preprint":false},{"pmid":"38032054","id":"PMC_38032054","title":"Regulation of the apico-basolateral trafficking polarity of the homologous copper-ATPases ATP7A and ATP7B.","date":"2023","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/38032054","citation_count":20,"is_preprint":false},{"pmid":"19127267","id":"PMC_19127267","title":"ATP7A is a novel target of retinoic acid receptor beta2 in neuroblastoma cells.","date":"2009","source":"British journal of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/19127267","citation_count":20,"is_preprint":false},{"pmid":"20574055","id":"PMC_20574055","title":"Differential contribution of the MTOR and MNK pathways to the regulation of mRNA translation in meiotic and postmeiotic mouse male germ cells.","date":"2010","source":"Biology of reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/20574055","citation_count":20,"is_preprint":false},{"pmid":"19679821","id":"PMC_19679821","title":"Alternative splicing of the Menkes copper Atpase (Atp7a) transcript in the rat intestinal epithelium.","date":"2009","source":"American journal of physiology. Gastrointestinal and liver physiology","url":"https://pubmed.ncbi.nlm.nih.gov/19679821","citation_count":20,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50456,"output_tokens":6335,"usd":0.123197},"stage2":{"model":"claude-opus-4-6","input_tokens":9973,"output_tokens":4314,"usd":0.236572},"total_usd":0.359769,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"ATP7A (MNK) localizes to the trans-Golgi network under basal copper conditions and redistributes to cytoplasmic vesicles and plasma membrane upon elevated copper, returning to TGN when copper is reduced; stable expression of full-length cDNA in CHO-K1 cells conferred copper resistance proportional to expression level, providing first ultrastructural evidence for TGN/vesicle/plasma membrane cycling.\",\n      \"method\": \"Stable transfection, immunogold electron microscopy, confocal microscopy, copper resistance assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (EM, confocal, functional resistance assay) in single rigorous study\",\n      \"pmids\": [\"9668172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ATP7A is internalized from the plasma membrane via a clathrin- and caveolae-independent pathway that requires Rac1 GTPase activity; dominant-negative dynamin, Eps15, and caveolae inhibitors did not block ATP7A internalization, whereas constitutively active Rac1 inhibited internalization.\",\n      \"method\": \"Dominant-negative mutant expression, pharmacological inhibition, flow cytometry\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple negative controls plus positive Rac1 result, consistent with prior di-leucine motif requirement\",\n      \"pmids\": [\"12812980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"A di-leucine motif near the C-terminus of ATP7A (L1487/L1488) is required for endocytic retrieval from the plasma membrane; the N-terminal metal-binding domains are required for copper-regulated trafficking from TGN to plasma membrane in polarized MDCK cells, where ATP7A traffics to the basolateral membrane under elevated copper.\",\n      \"method\": \"Site-directed mutagenesis, confocal microscopy, surface biotinylation in polarized MDCK cells\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of specific motifs combined with functional trafficking readout\",\n      \"pmids\": [\"15269005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ATP7A and ATP7B sequester cisplatin, carboplatin, and oxaliplatin into vesicular compartments, modulating platinum pharmacodynamics; ATP7A-expressing Menkes fibroblast sublines showed increased vesicular platinum sequestration for cisplatin and carboplatin without increasing nuclear platinum delivery, whereas oxaliplatin reached DNA more efficiently; copper (but not platinum drugs) triggered ATP7A relocalization from perinuclear to peripheral locations.\",\n      \"method\": \"Engineered human Menkes fibroblasts expressing ATP7A or ATP7B, ICP-MS platinum measurement, vesicle fractionation, confocal microscopy\",\n      \"journal\": \"Molecular pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reconstituted transporter-proficient cell lines, multiple drugs, subcellular fractionation\",\n      \"pmids\": [\"15213293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ATP7A traffics from TGN to a vesicular compartment adjacent to the basolateral membrane in copper-exposed intestinal epithelium of transgenic mice, supporting a model of vesicular exocytosis for copper export rather than direct pumping across the basolateral membrane.\",\n      \"method\": \"Copper perfusion of isolated jejunal segment, immunofluorescence of frozen sections in ATP7A transgenic mice\",\n      \"journal\": \"The Journal of nutrition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic model with direct localization imaging, single lab\",\n      \"pmids\": [\"16317117\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ATP7A interacts with AIPP1 (ATPase-interacting PDZ protein) via its C-terminal class I PDZ-binding motif; interaction confirmed by yeast two-hybrid and co-immunoprecipitation from mammalian cells.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — yeast two-hybrid confirmed by single Co-IP, single lab\",\n      \"pmids\": [\"16051599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Glutaredoxin 1 (GRX1) interacts with the N-terminal copper-binding domain of ATP7A in a copper-dependent manner requiring intact MxCxxC motifs; proposed to reduce disulfide bonds or deglutathionylate cysteines in the CxxC motifs to facilitate copper binding and transport.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation from mammalian cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — two orthogonal methods but single lab; mechanistic model proposed but not directly tested\",\n      \"pmids\": [\"16884690\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ATP7A is expressed in extending axons during synaptogenesis; loss of ATP7A in mottled brindled mice causes disrupted olfactory sensory neuron axonal projections, impaired mitral/tufted cell dendritic growth, and glomerular disorganization in the olfactory bulb, establishing a developmental role for ATP7A in axon outgrowth and synaptogenesis.\",\n      \"method\": \"In vivo analysis of Atp7aMobr (mottled brindled) mouse olfactory system, immunostaining, confocal microscopy\",\n      \"journal\": \"Molecular and cellular neurosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function mouse model with specific neuroanatomical phenotype, single lab\",\n      \"pmids\": [\"17215139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Purified full-length human ATP7A (MNK) expressed in Sf9 insect cells forms a vanadate-sensitive phosphoenzyme intermediate activated by Cu(I) (EC50 = 0.7 µM, Hill coefficient 4.6), exhibits Cu(I)-dependent ATPase activity (K0.5 = 0.6 µM), and mediates active ATP-dependent vectorial 64Cu transport when reconstituted into liposomes, demonstrating cooperative high-affinity Cu(I) interaction.\",\n      \"method\": \"Purification by antibody affinity chromatography, phosphoenzyme assay, ATPase activity assay, liposome reconstitution with 64Cu transport\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in vitro with purified full-length protein, multiple biochemical assays\",\n      \"pmids\": [\"17009961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mottled mouse mutations differentially impair ATP7A copper transport and trafficking: the embryonic-lethal Atp7amo11H mutation mislocalizes ATP7A to the ER, impairs glycosylation, and abolishes copper delivery to the secretory pathway; perinatal-lethal (Macular) and viable (Viable brindle) mutations reduce copper delivery and cause constitutive trafficking to the plasma membrane, with Viable brindle hypertrafficking dependent on the catalytic phosphorylation site.\",\n      \"method\": \"Site-directed mutagenesis, immunofluorescence, copper transport assays in cell lines expressing mutant ATP7A\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mutagenesis linked to specific functional and trafficking defects, multiple mutant alleles tested\",\n      \"pmids\": [\"17483305\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ATP7A traffics from the TGN to vesicles that partially overlap with phagosomal compartments in macrophages upon IFN-γ stimulation; siRNA silencing of ATP7A attenuates bactericidal killing, and copper-sensitive E. coli (ΔcopA) are hypersensitive to macrophage killing in an ATP7A-dependent manner, establishing ATP7A-mediated copper transport as a component of the macrophage bactericidal mechanism.\",\n      \"method\": \"siRNA knockdown, confocal microscopy, bacterial killing assays in RAW264.7 macrophages, 64Cu uptake\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — siRNA knockdown with specific bacterial killing phenotype, copper-sensitive bacterial mutant as mechanistic probe, multiple methods\",\n      \"pmids\": [\"19808669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ATP7A is required for macrophage-mediated oxidation of LDL; siRNA knockdown of ATP7A in THP-1 macrophages attenuates LDL oxidation and reduces expression and enzymatic activity of cytosolic phospholipase A2α (cPLA2α), with reduced cPLA2α promoter activity, suggesting ATP7A transcriptionally regulates cPLA2α.\",\n      \"method\": \"siRNA knockdown, LDL oxidation assay, promoter activity assay, enzyme activity assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific molecular mechanism, single lab\",\n      \"pmids\": [\"19965596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ATP7A missense mutations T994I and P1386S (causing distal motor neuropathy) show normal mRNA and protein levels but defective intracellular trafficking, with exaggerated plasma membrane localization and impaired endocytic retrieval to TGN; ATP7A(T994I) shows abnormal interaction with p97/VCP, and siRNA knockdown of p97/VCP corrects ATP7A(T994I) mislocalization; ATP7A(P1386S) places its C-terminal di-leucine endocytic motif extracellularly, impeding internalization.\",\n      \"method\": \"TIRF microscopy in patient fibroblasts, transfection of NSC-34 motor neurons, immunoprecipitation, siRNA knockdown, flow cytometry\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods including patient-derived cells and motor neuron models, functional rescue\",\n      \"pmids\": [\"20170900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Clusterin and COMMD1 independently interact with ATP7A and ATP7B to facilitate their degradation: clusterin promotes lysosomal degradation and COMMD1 promotes proteasomal degradation; overexpression of either reduces endogenous ATP7A/B levels, knockdown increases them, and their interactions with ATP7A/B are neither competitive nor cooperative.\",\n      \"method\": \"Overexpression and siRNA knockdown, co-immunoprecipitation, lysosomal/proteasomal inhibitors, immunoblotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — bidirectional manipulation (OE + KD) with mechanistic pathway separation, multiple Cu-ATPase substrates\",\n      \"pmids\": [\"22130675\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The TIRF microscopy and flow cytometry analyses of ATP7A(T994I) and ATP7A(P1386S) mutations in patient fibroblasts and Hek293T cells further confirmed preferential plasma membrane accumulation and impaired endocytic retrieval; p97/VCP abnormally binds ATP7A(T994I) and its siRNA knockdown corrects mislocalization.\",\n      \"method\": \"Total internal reflection fluorescence microscopy, transfection, immunoprecipitation, siRNA, flow cytometry\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in patient-derived and engineered cells\",\n      \"pmids\": [\"22210628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ATP7A/B Cu-ATPases form a phosphoenzyme intermediate (E-P) in an ATP-dependent manner; unlike SERCA, ATP7A/B phosphoenzyme formation is slow and highly temperature-sensitive; ATP-dependent charge transfer occurs without Cu+/H+ exchange; copper-deprived ATP7A undergoes inactivating interaction of its N-metal binding extension with headpiece domains preventing reverse phosphorylation, which is relieved by deletion of the N-MBD.\",\n      \"method\": \"Solid supported membrane electrical measurements, pH variation experiments, charge transfer measurements, Glu-309 mutation comparison, N-MBD deletion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro biochemical reconstitution with domain mutagenesis, mechanistic comparison with SERCA\",\n      \"pmids\": [\"22854969\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Cisplatin, carboplatin, and oxaliplatin activate Cu-ATPases ATP7A and ATP7B and undergo ATP-dependent translocation similar to copper; NMR and ESI-MS show that cisplatin binds the first N-terminal metal-binding domain of ATP7A (Mnk1) via cis-coordination of Cys19 and Cys22 sulfur atoms to the [Pt(NH3)2]2+ moiety.\",\n      \"method\": \"Solid supported membrane electrical measurements on COS-1 microsomes expressing recombinant ATP7A/B, NMR spectroscopy, ESI-MS\",\n      \"journal\": \"Angewandte Chemie (International ed. in English)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro electrophysiology plus NMR structure of drug-protein adduct\",\n      \"pmids\": [\"24375922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Transcription factors Sp1 and Hif2α cooperatively induce ATP7A (Atp7a) gene expression during hypoxia/iron deficiency; four functional Sp1 binding sites in the Atp7a promoter are necessary for Hif2α-mediated induction; ChIP confirmed Sp1 binding to the Atp7a promoter in IEC-6 cells and rat duodenal enterocytes.\",\n      \"method\": \"Mithramycin inhibition, Sp1 overexpression, site-directed mutagenesis of promoter, ChIP, reporter assay in IEC-6 cells\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis + ChIP + functional reporter, single lab\",\n      \"pmids\": [\"23814049\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cisplatin binds the first N-terminal soluble domain of ATP7A with cis-coordination of [Pt(NH3)2]2+ to Cys19 and Cys22; Car-Parrinello QM/MM simulations and computational spectroscopy validated against CD spectra and NMR chemical shifts provide the first quantitative 3D atomic view of platinum binding to ATP7A.\",\n      \"method\": \"ESI-MS, 1H/13C/15N NMR, QM/MM simulations, CD spectroscopy\",\n      \"journal\": \"Dalton transactions\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure determination with computational validation against experimental spectra\",\n      \"pmids\": [\"24983998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss of ATP7A activity in Menkes patient fibroblasts and CRISPR/Cas9-inactivated 3T3-L1 cells causes copper accumulation in mitochondria leading to glutathione oxidation and elevated H2O2 in mitochondria (measured by GRX1-roGFP2 and HyPer sensors), markedly increasing sensitivity to glutathione depletion; elevated copper rather than H2O2 is the primary cause of glutathione oxidation.\",\n      \"method\": \"CRISPR/Cas9 inactivation, patient-derived fibroblasts, live-cell ratiometric sensors (GRX1-roGFP2, HyPer), MitoQ treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — CRISPR KO plus patient cells, live quantitative imaging sensors, pharmacological rescue\",\n      \"pmids\": [\"27226607\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The ATP7A interactome (541 co-isolated proteins by immunoaffinity chromatography) includes subunits of the conserved oligomeric Golgi (COG) complex; COG-null cells show altered ATP7A and CTR1 content and localization, decreased total cellular copper, and impaired copper-dependent metabolic responses; genetic manipulation of ATP7A and COG subunits in Drosophila neurons alters synapse development and copper-induced mortality.\",\n      \"method\": \"ATP7A immunoaffinity chromatography/MS, COG-null cell analysis, subcellular fractionation, Drosophila genetics\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — MS interactome validated by genetic epistasis in two model systems\",\n      \"pmids\": [\"28355134\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Akt2 (protein kinase B beta) phosphorylates ATP7A at Ser1424/Ser1463/Ser1466 upon insulin stimulation, stabilizing ATP7A by preventing ubiquitination/proteasomal degradation and promoting its translocation to the plasma membrane in vascular smooth muscle cells, thereby enabling full activation of extracellular SOD3.\",\n      \"method\": \"Immunoprecipitation, in vitro kinase assay, mass spectrometry, Akt2-/- mice, constitutively active Akt, ATP7A overexpression rescue of SOD3 activity\",\n      \"journal\": \"Arteriosclerosis, thrombosis, and vascular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro kinase assay + MS site identification + genetic mouse models + functional SOD3 rescue\",\n      \"pmids\": [\"29301787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ATP7A is necessary for the enzymatic activity of lysyl oxidase (LOX) and LOXL copper-dependent metalloenzymes; siRNA silencing of ATP7A inhibits LOX activity in 4T1 cells and attenuates LOX-dependent FAK phosphorylation and myeloid cell lung recruitment in an orthotopic mouse breast cancer model, as well as Lewis lung carcinoma metastasis.\",\n      \"method\": \"siRNA knockdown, LOX activity assay, orthotopic mouse models, lung metastasis analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with specific enzymatic activity readout validated in two in vivo models\",\n      \"pmids\": [\"30890638\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Caveolin-1 stabilizes ATP7A protein in vascular tissue by preventing its ubiquitination and proteasomal degradation; ATP7A binds Cav-1 and co-localizes with SOD3 in caveolae/lipid rafts; loss of Cav-1 reduces ATP7A protein (not mRNA) and SOD3 activity, causing endothelial dysfunction rescuable by SOD3 gene transfer or ATP7A-overexpressing transgenic mice.\",\n      \"method\": \"Cav-1-/- mice, immunoprecipitation, ubiquitination assay, SOD3 activity, vascular relaxation, gene transfer rescue\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO with molecular mechanism (ubiquitination) and functional rescue in vivo\",\n      \"pmids\": [\"32936699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"VEGF stimulates ATP7A translocation from the TGN to the plasma membrane where it binds VEGFR2, preventing autophagy-mediated lysosomal degradation of VEGFR2 by blocking p62/SQSTM1 binding to ubiquitinated VEGFR2; EC-specific ATP7A-deficient and ATP7Amut mice show impaired post-ischemic neovascularization and reduced VEGFR2 signaling.\",\n      \"method\": \"Inducible EC-specific knockout mice, ATP7Amut transgenic mice, co-immunoprecipitation, autophagy reporter transgenic mice (CAG-RFP-EGFP-LC3), VEGFR2 signaling assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic mouse models, direct protein interaction, mechanistic pathway with autophagy reporter\",\n      \"pmids\": [\"34035268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In polarized epithelia, ATP7A and ATP7B reside on distinct TGN domains under low copper; upon copper elevation ATP7A traffics to the basolateral membrane while ATP7B traverses recycling and apical sorting endosomes to the apical membrane; AP-1 complex is required for sorting of both Cu-ATPases: AP-1A provides directionality and TGN retention, while AP-1B governs copper-independent ATP7B trafficking specifically.\",\n      \"method\": \"Pan-AP-1 knockout and AP-1A/AP-1B isoform-specific knockouts, mass spectrometry, confocal microscopy in polarized cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform-specific genetic KOs with precise trafficking readouts, MS interactome\",\n      \"pmids\": [\"38032054\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP7A is a P-type Cu(I)-transporting ATPase that forms a copper-activated phosphoenzyme intermediate and mediates ATP-dependent vectorial copper transport; it resides in the trans-Golgi network under basal conditions and undergoes copper-regulated, AP-1-dependent trafficking to the basolateral plasma membrane (or to phagosomal/VEGFR2-associated vesicles in specialized contexts), returning via Rac1-dependent, clathrin-independent endocytosis; it delivers copper to secretory cuproenzymes (including LOX, SOD3, and peptidylglycine amidating monooxygenase), protects mitochondria from copper-induced redox damage, mediates macrophage bactericidal copper delivery, and is stabilized by Akt2 phosphorylation and Caveolin-1 binding while being degraded via clusterin/lysosomal or COMMD1/proteasomal pathways.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATP7A is a P-type Cu(I)-transporting ATPase that forms a copper-activated phosphoenzyme intermediate with cooperative high-affinity Cu(I) binding (K0.5 ~0.6 µM) and mediates ATP-dependent vectorial copper transport across membranes, supplying copper to secretory cuproenzymes including lysyl oxidase, SOD3, and peptidylglycine α-amidating monooxygenase [PMID:17009961, PMID:30890638, PMID:29301787]. Under basal conditions ATP7A resides in the trans-Golgi network and undergoes copper-stimulated, AP-1-dependent trafficking to the basolateral plasma membrane, returning via a Rac1-dependent, clathrin-independent endocytic pathway that requires a C-terminal di-leucine motif; in specialized contexts it relocates to phagosomal compartments (macrophage bactericidal copper delivery) or associates with VEGFR2 at the plasma membrane to protect the receptor from autophagic degradation [PMID:9668172, PMID:12812980, PMID:15269005, PMID:38032054, PMID:19808669, PMID:34035268]. ATP7A protein stability is maintained by Akt2 phosphorylation and Caveolin-1 binding, which prevent ubiquitination-dependent proteasomal degradation, while clusterin promotes its lysosomal turnover and COMMD1 its proteasomal turnover; loss of ATP7A causes mitochondrial copper accumulation with glutathione oxidation, impairs axon outgrowth, and underlies Menkes disease and an allelic distal motor neuropathy linked to trafficking-defective missense mutations [PMID:29301787, PMID:32936699, PMID:22130675, PMID:27226607, PMID:17483305, PMID:20170900]. ATP7A also binds and translocates platinum-based chemotherapeutic agents via its N-terminal CxxC motifs, modulating cisplatin pharmacodynamics [PMID:15213293, PMID:24375922].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Establishing the copper-dependent TGN-to-plasma-membrane trafficking cycle resolved where ATP7A operates and how cells regulate copper efflux directionally.\",\n      \"evidence\": \"Immunogold EM and confocal microscopy of stably transfected CHO-K1 cells showed TGN residence at basal copper and redistribution to vesicles/plasma membrane at elevated copper, with functional copper resistance proportional to expression level.\",\n      \"pmids\": [\"9668172\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Endocytic retrieval mechanism and sorting signals not yet identified\",\n        \"Whether trafficking occurs in polarized epithelial cells unknown\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identifying the Rac1-dependent, clathrin/caveolae-independent internalization pathway defined a novel endocytic route for a polytopic membrane transporter.\",\n      \"evidence\": \"Dominant-negative dynamin, Eps15, and caveolae inhibitors failed to block ATP7A internalization in transfected cells; constitutively active Rac1 inhibited retrieval, measured by flow cytometry.\",\n      \"pmids\": [\"12812980\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Coat proteins or adaptors mediating Rac1-dependent endocytosis of ATP7A not identified\",\n        \"Upstream signals activating Rac1 in this context unknown\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Mapping the C-terminal di-leucine endocytic motif and N-terminal metal-binding domain requirements for copper-regulated basolateral trafficking dissected the molecular determinants controlling ATP7A directionality in polarized cells.\",\n      \"evidence\": \"Site-directed mutagenesis in polarized MDCK cells; L1487/L1488 mutations blocked endocytic retrieval; N-MBD deletions impaired copper-stimulated exit from TGN, assessed by confocal microscopy and surface biotinylation.\",\n      \"pmids\": [\"15269005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether additional sorting motifs contribute in different epithelial contexts\",\n        \"Adaptor complexes mediating basolateral targeting not identified\"\n      ]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that ATP7A sequesters platinum drugs into vesicular compartments revealed an unanticipated role in chemotherapy pharmacokinetics and established substrate promiscuity beyond copper.\",\n      \"evidence\": \"ICP-MS and vesicle fractionation in Menkes fibroblasts reconstituted with ATP7A showed increased vesicular cisplatin/carboplatin without enhanced nuclear delivery; copper but not platinum triggered relocalization.\",\n      \"pmids\": [\"15213293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis for platinum binding to ATP7A not yet resolved\",\n        \"In vivo relevance to drug resistance unconfirmed\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Biochemical reconstitution of purified full-length ATP7A in liposomes proved it is a bona fide Cu(I)-translocating ATPase with cooperative copper activation, placing it mechanistically alongside other P-type ATPases.\",\n      \"evidence\": \"Purified Sf9-expressed ATP7A formed vanadate-sensitive phosphoenzyme activated by Cu(I) (Hill coefficient 4.6), exhibited Cu(I)-dependent ATPase activity, and mediated 64Cu transport into liposomes.\",\n      \"pmids\": [\"17009961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Full-length structural model unavailable\",\n        \"How cooperativity is achieved among six N-terminal metal-binding domains mechanistically undefined\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Phenotypic analysis of mottled mouse alleles demonstrated that specific domains control distinct steps—ER exit, copper delivery, and trafficking—linking genotype to Menkes disease severity and establishing ATP7A's developmental role in axon outgrowth.\",\n      \"evidence\": \"Mutant ATP7A constructs corresponding to mottled alleles showed ER retention (mo11H), constitutive plasma membrane localization (Macular, Viable brindle), and reduced copper delivery; Mottled brindled mice exhibited disrupted olfactory axon projections.\",\n      \"pmids\": [\"17483305\", \"17215139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Specific cuproenzymes mediating ATP7A-dependent axon outgrowth not identified\",\n        \"Whether motor neuron pathology in human disease shares the same mechanism unclear\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Linking ATP7A to macrophage bactericidal copper delivery expanded its role beyond biosynthetic copper loading to innate immune defense.\",\n      \"evidence\": \"IFN-γ stimulated ATP7A translocation to phagosome-adjacent vesicles in RAW264.7 macrophages; siRNA knockdown attenuated killing of copper-sensitive E. coli ΔcopA.\",\n      \"pmids\": [\"19808669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether ATP7A directly pumps copper into the phagosome lumen or delivers via vesicle fusion\",\n        \"Relevance to in vivo human infection not tested\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Characterizing distal motor neuropathy mutations T994I and P1386S as trafficking-defective alleles with preserved catalytic function revealed that aberrant plasma membrane retention (not loss of transport) causes a distinct clinical phenotype, and identified p97/VCP as an unexpected trafficking partner.\",\n      \"evidence\": \"TIRF microscopy in patient fibroblasts showed exaggerated surface accumulation; IP revealed abnormal p97/VCP binding to T994I; p97/VCP knockdown rescued mislocalization; P1386S placed the di-leucine motif extracellularly.\",\n      \"pmids\": [\"20170900\", \"22210628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How p97/VCP interaction normally facilitates ATP7A retrieval mechanistically undefined\",\n        \"Whether p97/VCP is a direct binding partner or acts through an adaptor unknown\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identification of clusterin (lysosomal) and COMMD1 (proteasomal) as independent degradation mediators for ATP7A defined dual proteolytic quality-control pathways governing transporter abundance.\",\n      \"evidence\": \"Bidirectional manipulation (overexpression and siRNA) in cultured cells with lysosomal/proteasomal inhibitors; co-IP confirmed distinct, non-competitive interactions with ATP7A.\",\n      \"pmids\": [\"22130675\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Ubiquitin ligase(s) linking COMMD1 to ATP7A ubiquitination not identified\",\n        \"Physiological signals controlling each degradation pathway unclear\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"NMR/ESI-MS structural determination of cisplatin binding to the first N-terminal metal-binding domain of ATP7A via Cys19/Cys22 cis-coordination provided an atomic-level explanation for platinum drug transport by copper ATPases.\",\n      \"evidence\": \"NMR and ESI-MS of Mnk1 domain incubated with cisplatin; electrophysiology on COS-1 microsomes showed ATP-dependent platinum translocation comparable to copper.\",\n      \"pmids\": [\"24375922\", \"24983998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether all six N-terminal domains bind platinum and their relative affinities unknown\",\n        \"In vivo contribution of ATP7A-mediated platinum efflux to clinical drug resistance not quantified\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating that ATP7A loss causes mitochondrial copper overload with consequent glutathione oxidation identified a cytoprotective role for ATP7A in maintaining mitochondrial redox homeostasis.\",\n      \"evidence\": \"CRISPR/Cas9 KO in 3T3-L1 cells and Menkes patient fibroblasts, live-cell GRX1-roGFP2 and HyPer sensors showed elevated mitochondrial glutathione oxidation and H₂O₂ driven primarily by copper accumulation.\",\n      \"pmids\": [\"27226607\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Mechanism by which ATP7A normally prevents mitochondrial copper accumulation (direct or indirect) not resolved\",\n        \"Whether mitochondrial redox imbalance contributes to Menkes neurodegeneration in vivo unknown\"\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identification of Akt2-mediated phosphorylation at three C-terminal serines as a stabilizing signal that prevents ATP7A ubiquitination and promotes plasma membrane translocation linked insulin signaling to copper-dependent SOD3 activation in vasculature.\",\n      \"evidence\": \"In vitro kinase assay, MS phosphosite mapping, Akt2−/− mice showed reduced ATP7A and SOD3 activity; constitutively active Akt rescued ATP7A stability.\",\n      \"pmids\": [\"29301787\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"E3 ligase counteracting Akt2-mediated stabilization not identified\",\n        \"Whether other kinases regulate ATP7A trafficking in non-vascular contexts unknown\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Caveolin-1 was established as a second stabilizing partner for ATP7A, preventing its ubiquitination in vascular tissue and coupling copper delivery to SOD3 within caveolae/lipid rafts.\",\n      \"evidence\": \"Cav-1−/− mice showed reduced ATP7A protein but not mRNA, increased ubiquitination, decreased SOD3 activity, and endothelial dysfunction rescued by SOD3 gene transfer or ATP7A overexpression.\",\n      \"pmids\": [\"32936699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether Cav-1 and Akt2 act on the same or distinct ubiquitin signals on ATP7A\",\n        \"Structural basis of Cav-1/ATP7A interaction not defined\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Discovery that ATP7A binds VEGFR2 at the plasma membrane and shields it from p62/SQSTM1-mediated autophagic degradation revealed a copper-transport-independent scaffolding function critical for post-ischemic neovascularization.\",\n      \"evidence\": \"Inducible EC-specific ATP7A KO and ATP7Amut mice showed impaired VEGFR2 signaling and neovascularization; co-IP showed ATP7A–VEGFR2 interaction; autophagy reporter mice confirmed increased VEGFR2 autophagic flux upon ATP7A loss.\",\n      \"pmids\": [\"34035268\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether the scaffolding function requires copper occupancy or is purely structural\",\n        \"Domain on ATP7A mediating VEGFR2 binding not mapped\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolving AP-1 adaptor complex isoform-specific roles in ATP7A versus ATP7B sorting from the TGN explained how two homologous transporters achieve opposite polarity in the same polarized epithelial cell.\",\n      \"evidence\": \"Pan-AP-1, AP-1A, and AP-1B isoform-specific knockouts in polarized cells; MS interactome; confocal imaging showed AP-1A provides TGN retention and directionality for both ATPases, while AP-1B specifically controls copper-independent ATP7B trafficking.\",\n      \"pmids\": [\"38032054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Motifs on ATP7A recognized by AP-1A not mapped\",\n        \"Whether post-translational modifications modulate AP-1 interaction affinity\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution full-length structure of ATP7A, the identity of the E3 ubiquitin ligase(s) governing its turnover, the mechanism linking ATP7A to mitochondrial copper homeostasis, and the structural basis of its non-transport scaffolding interaction with VEGFR2 remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No full-length atomic structure of ATP7A available\",\n        \"E3 ligase(s) mediating ATP7A ubiquitination not identified\",\n        \"How ATP7A prevents mitochondrial copper accumulation mechanistically unclear\",\n        \"Domain mapping of the ATP7A–VEGFR2 scaffolding interaction not performed\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [8, 15, 16]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [8, 3, 10]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [8, 15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 4, 25]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 12, 21, 24]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 4, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [8, 0, 4, 10]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 2, 25]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [13, 21, 23]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [8, 19]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"VEGFR2\",\n      \"CAV1\",\n      \"AKT2\",\n      \"COMMD1\",\n      \"CLU\",\n      \"VCP\",\n      \"GLRX\",\n      \"RAC1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}