{"gene":"CCS","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":1998,"finding":"CCS (copper chaperone for SOD1) directly interacts with SOD1 in vitro and in vivo, and this interaction is mediated via the homologous SOD1-like domain in CCS. CCS also interacts with FALS mutant forms of SOD1.","method":"Co-immunoprecipitation, in vitro binding assays, amino acid sequence alignment identifying homologous dimerization domains","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP plus in vitro binding, replicated across wild-type and multiple FALS mutant SOD1 variants in a single focused study","pmids":["9726962"],"is_preprint":false},{"year":1999,"finding":"CCS domain II shares ~50% identity with SOD1 and contains all zinc-binding ligands but only three of four copper-binding histidines (the fourth is Asp200). A D200H mutation in CCS confers superoxide dismutase activity without abolishing copper chaperone function, indicating Asp200 evolved to preclude deleterious copper reactions in CCS.","method":"Site-directed mutagenesis of CCS expressed in yeast, SOD activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro/yeast enzymatic assay with mutagenesis, single lab but multiple functional readouts","pmids":["10601249"],"is_preprint":false},{"year":1999,"finding":"CCS contains three structural domains; a homology model based on bacterial mercury-detoxification proteins and SOD structure predicts a copper-transfer pathway involving sulfur ligands, accounting for electrostatic target recognition, copper storage, and transfer to SOD.","method":"Homology modelling of CCS three-dimensional structure","journal":"Structure (London, England : 1993)","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational prediction only, no experimental structural or mutagenesis validation reported in this abstract","pmids":["10467139"],"is_preprint":false},{"year":2001,"finding":"A fraction of CCS and active SOD1 co-localizes to the mitochondrial intermembrane space (IMS) in yeast. Mitochondrial accumulation of SOD1 is strongly influenced by CCS: repression of CCS reduces IMS SOD1, while high mitochondrial CCS increases IMS SOD1. IMS SOD1 is protective against mitochondrial oxidative damage.","method":"Subcellular fractionation, genetic repression of CCS expression, protein carbonyl assays, survival assays in stationary-phase yeast","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct fractionation plus genetic manipulation with quantitative functional readouts, mechanistic link between CCS levels and SOD1 IMS localization established","pmids":["11500508"],"is_preprint":false},{"year":2004,"finding":"The Cu-bound form of CCS (Cu-CCS) mediates oxidative formation of the conserved disulfide bond in SOD1 in vivo and in vitro, even in the presence of excess reductants. Cu-CCS facilitates cysteine oxidation and disulfide isomerization in a stepwise conversion of immature SOD1 to the active state. The disulfide status of SOD1 significantly affects the monomer-dimer equilibrium, CCS interaction, and enzyme activity.","method":"Biochemical activity assays with purified proteins in vitro and yeast in vivo, redox state analysis, monomer-dimer equilibrium measurement","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified proteins plus in vivo yeast genetics, multiple orthogonal methods in one rigorous study","pmids":["15215895"],"is_preprint":false},{"year":2004,"finding":"CCS mediates posttranslational activation of SOD1 in response to increases in oxygen tension; O2 (or superoxide) is required for SOD1 activation by CCS. Existing apo-pools of SOD1 are activated by CCS early in the oxidative response, prior to new SOD1 protein synthesis.","method":"Activity assays with pure proteins and cell extracts, translational blocking experiments, dose-response studies with O2 tension","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro assay with purified proteins plus cell extract experiments, multiple orthogonal approaches identifying O2-dependent activation function of CCS","pmids":["15064408"],"is_preprint":false},{"year":2004,"finding":"In the absence of CCS, mammalian SOD1 can be activated through a secondary CCS-independent pathway involving glutathione (GSH). Yeast SOD1 cannot use this pathway due to dual prolines near the C-terminus; insertion of these prolines into human SOD1 renders it refractory to CCS-independent activation.","method":"Expression of human SOD1 in CCS-null yeast and mammalian cells, GSH depletion experiments, proline mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic complementation in CCS-null yeast and mammalian fibroblasts plus mutagenesis, multiple orthogonal approaches","pmids":["15069187"],"is_preprint":false},{"year":2008,"finding":"CCS over-expression in G93A SOD1 mice accelerates ALS disease and correlates with incomplete oxidation of the SOD1 intra-subunit disulfide in brain and spinal cord. A C244,246S CCS mutant that can interact with SOD1 but cannot insert copper or oxidize the disulfide still prevents SOD1 misfolding (detergent insolubility), indicating a copper-insertion-independent molecular chaperone function of CCS.","method":"Transgenic mouse model (G93A/CCS), redox state analysis of SOD1 disulfide in vivo, cell culture with CCS mutants, detergent solubility assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo mouse genetics plus cell culture with defined CCS mutants, multiple orthogonal readouts identifying novel chaperone activity independent of copper insertion","pmids":["18337307"],"is_preprint":false},{"year":2008,"finding":"Overexpression of CCS in G93A SOD1 mice causes an isolated cytochrome c oxidase (complex IV) deficiency in spinal cord, with 55% reduction in complex IV activity and marked reductions in COX1 and COX5b subunits, while activities of complexes I, II, III, and V are unaffected.","method":"Enzymatic activity assays of respiratory chain complexes, blue native PAGE, SDS-PAGE Western blotting, heme A analysis of spinal cord from CCS/G93A SOD1 transgenic mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical methods (enzyme assays, BN-PAGE, Western blot, heme analysis) in transgenic mouse model","pmids":["18334481"],"is_preprint":false},{"year":2009,"finding":"CCS-dependent SOD1 activation requires molecular oxygen and results in disulfide oxidation dependent on both copper and O2, whereas the CCS-independent pathway can activate SOD1 under anaerobic conditions without forming the disulfide via CCS. Both pathways acquire copper from the same intracellular pool derived from cell-surface transporters. A proline at position 144 in yeast SOD1 is responsible for the strict copper/oxygen/CCS requirement for disulfide formation.","method":"Yeast expression system, anaerobic growth conditions, copper-depletion studies, mutagenesis of SOD1 proline residue, activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vivo yeast genetics with mutagenesis and anaerobic conditions, multiple orthogonal approaches in one focused study","pmids":["19542232"],"is_preprint":false},{"year":2010,"finding":"CCS mitochondrial distribution and IMS import is regulated by the Mia40/Erv1 disulfide relay system in a redox-dependent manner, and CCS in turn promotes SOD1 maturation and retention in the IMS through disulfide bond formation.","method":"Fractionation, genetic analyses in yeast and mammalian cells (review synthesis of mechanistic studies)","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — review integrating multiple experimental findings but individual experiments not directly described in this abstract","pmids":["20367259"],"is_preprint":false},{"year":2010,"finding":"XIAP E3 ubiquitin ligase ubiquitinates CCS; this ubiquitination enhances CCS chaperone activity toward SOD1 rather than targeting CCS for proteasomal degradation. CCS mediates copper delivery to XIAP in cells.","method":"Co-immunoprecipitation, ubiquitination assays, SOD1 activity assays in cells with XIAP manipulation","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, functional ubiquitination assay with chaperone activity readout, single lab with multiple orthogonal methods","pmids":["20154138"],"is_preprint":false},{"year":2012,"finding":"A human CCS mutation (p.Arg163Trp) in domain II impairs CCS binding to SOD1, reduces CCS expression, and reduces SOD1 activity. This is the first human pathogenic mutation identified in a copper chaperone gene. CCS R163W fails to complement yeast Lys7Δ mutant.","method":"Immunoprecipitation, mammalian cell transfection, patient fibroblast biochemical analysis, yeast complementation assay","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP, yeast complementation, patient cell biochemistry) in a single rigorous study","pmids":["22508683"],"is_preprint":false},{"year":2015,"finding":"The first domain of CCS (CCS1) is monomeric and can exchange copper with the cytosolic chaperone Atox1 in vitro; Cu transfer occurs in both directions and requires intact metal-binding cysteines. Full-length CCS also participates in this cross-pathway Cu exchange.","method":"NMR, size exclusion chromatography with 254/280 nm ratio as Cu loading indicator, Cys→Ala mutagenesis of Atox1","journal":"Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR and biochemical assay in vitro, single lab, novel finding but limited to in vitro conditions","pmids":["25673218"],"is_preprint":false},{"year":2017,"finding":"The SOD1-like domain of CCS (CCS-D2) forms a stable complex with zinc-bound SOD1 in human cells (shown by in-cell NMR), stabilizes mutant apo-SOD1 prior to zinc binding, prevents accumulation of unstructured mutant SOD1, and promotes zinc binding—demonstrating a molecular chaperone function distinct from copper insertion.","method":"In-cell NMR, in vitro NMR, cell-based stability assays for SOD1 mutants","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in-cell NMR and in vitro NMR with multiple SOD1 mutants, novel mechanistic finding with direct structural evidence","pmids":["29234142"],"is_preprint":false},{"year":2017,"finding":"SOD1 and CCS are S-acylated (palmitoylated) in human and mouse spinal cords. SOD1 and CCS form a highly stable heterodimer in human spinal cord that resists boiling, denaturants, and reducing agents; S-acylation is highest for SOD1-CCS heterodimers. CCS cysteine mutations that attenuate SOD1 maturation prevent heterodimer formation.","method":"Acyl resin-assisted capture (acyl-RAC) assay on human post-mortem and mouse spinal cord, HEK293 cell in vitro assays, cysteine mutagenesis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — acyl-RAC biochemical assay across human and mouse tissues plus mutagenesis, multiple orthogonal methods","pmids":["28120938"],"is_preprint":false},{"year":2019,"finding":"CCS stably interacts with the cytosolic C-terminal tail of the copper importer Ctr1 (Ctr1c) in a copper-dependent manner; this interaction becomes tripartite (Cu(I)-Ctr1c·CCS·SOD1 heterotrimer) upon addition of immature SOD1. Only complete SOD1 activation (copper delivery + disulfide bond formation) breaks the Ctr1c·CCS·SOD1 complex, indicating that activated SOD1 terminates the Ctr1-CCS interaction.","method":"Biochemical reconstitution in solution, pulldown/co-elution assays with purified proteins, engineered immature SOD1 forms","journal":"Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with purified recombinant proteins, multiple complex assembly states tested, single lab but rigorous biochemistry","pmids":["31292775"],"is_preprint":false},{"year":2020,"finding":"Binding of SOD1 by CCS stabilizes a conformation of SOD1 that promotes site-specific high-affinity zinc binding. Several fALS-linked SOD1 mutations disrupt this CCS-promoted high-affinity zinc binding, suggesting that nonproductive Sod1 maturation by Ccs may be a common link across diverse fALS mutations.","method":"Zinc affinity measurements of wild-type and fALS SOD1 mutants in the presence or absence of CCS, biochemical binding assays","journal":"Molecules (Basel, Switzerland)","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — quantitative zinc affinity measurements with multiple SOD1 mutants, single lab, single primary method","pmids":["32121118"],"is_preprint":false},{"year":2021,"finding":"CCS selectively binds to MEK1 and facilitates copper transfer to MEK1, promoting MEK1 kinase activity. CCS mutants that disrupt Cu(I) acquisition and exchange, or a CCS small-molecule inhibitor, reduce Cu-stimulated MEK1 kinase activity.","method":"Surface plasmon resonance, proximity-dependent biotin ligase (BioID) studies, CCS Cu-binding mutants, small-molecule CCS inhibitor, MEK1 kinase activity assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — SPR binding assay plus proximity labeling plus functional kinase assay with CCS mutants and inhibitor, multiple orthogonal methods in one study","pmids":["34715128"],"is_preprint":false},{"year":2024,"finding":"The pathogenic CCS variant R163W loses Zn binding at its SOD1-like domain (D2), gains unusually high-affinity Cu(I) binding in D2 with accompanying disulfide bond formation, and this diverts R163W CCS from copper chaperone to copper scavenger that accelerates SOD1 deactivation—acting as an 'anti-chaperone'.","method":"Comprehensive structural and biochemical analysis including Cu(II)→Cu(I) reduction assays, Zn binding measurements, disulfide detection, aggregation assays","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biochemical and structural methods on purified protein, mechanistic model directly supported by experimental data","pmids":["39099176"],"is_preprint":false},{"year":2024,"finding":"The E3 ubiquitin ligase TRIM22 ubiquitinates CCS via K27-linked ubiquitination at Lys76 of CCS, targeting it for proteasomal degradation. TRIM22-mediated CCS degradation reduces ROS scavenging, increases reactive oxygen species, and inhibits STAT3 phosphorylation in breast cancer cells. The coiled-coil domain of TRIM22 is required for CCS ubiquitination.","method":"Label-free proteomics, Co-IP, ubiquitination assays, mutagenesis of TRIM22 coiled-coil domain and CCS Lys76, ROS assays, STAT3 phosphorylation assays","journal":"Cancer letters","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods (proteomics, Co-IP, ubiquitination assay, mutagenesis, functional readouts) in one study","pmids":["39127340"],"is_preprint":false}],"current_model":"CCS is a multi-domain copper chaperone that directly binds immature SOD1 via its SOD1-like domain (domain II), acquires Cu(I) from the Ctr1 copper importer, transfers copper to SOD1, and catalyzes formation of SOD1's essential intra-subunit disulfide bond in an O2-dependent manner; it also acts as a molecular chaperone to stabilize apo-SOD1 and promote zinc binding, facilitates SOD1 import and retention in the mitochondrial IMS through the Mia40/Erv1 redox relay, delivers copper to MEK1/2 kinases to modulate MAPK signaling, is subject to regulatory ubiquitination by XIAP (enhancing chaperone activity) and TRIM22 (targeting it for degradation), and is S-acylated in human spinal cord where it forms a stable heterodimer with SOD1."},"narrative":{"mechanistic_narrative":"CCS is a copper chaperone that delivers copper to and catalyzes the maturation of the antioxidant enzyme SOD1 [PMID:9726962, PMID:15215895]. It recognizes immature SOD1 through its SOD1-homologous domain II, which retains all zinc-binding ligands but substitutes Asp200 for one of the four copper-binding histidines, an evolutionary change that precludes deleterious copper chemistry within CCS itself [PMID:9726962, PMID:10601249]. The copper-loaded form of CCS catalyzes the oxidative formation of SOD1's conserved intra-subunit disulfide bond, converting apo-SOD1 to the active enzyme in a strictly oxygen-dependent reaction; existing apo-SOD1 pools are activated by CCS early in the oxidative response prior to new protein synthesis [PMID:15215895, PMID:15064408]. CCS acquires its copper from a cell-surface-derived intracellular pool, interacting with the cytosolic tail of the importer Ctr1 to form a Cu(I)-Ctr1·CCS·SOD1 transfer intermediate that disassembles only upon complete SOD1 activation, and it can also exchange copper bidirectionally with the cytosolic chaperone Atox1 [PMID:25673218, PMID:31292775]. Beyond metal insertion, CCS acts as a molecular chaperone that stabilizes apo-SOD1, prevents accumulation of unstructured mutant protein, and promotes site-specific high-affinity zinc binding—a function independent of copper insertion [PMID:18337307, PMID:29234142, PMID:32121118]. CCS additionally promotes SOD1 maturation and retention in the mitochondrial intermembrane space, where it is itself imported under control of the Mia40/Erv1 disulfide relay [PMID:11500508, PMID:20367259], and delivers copper to MEK1 to support its kinase activity [PMID:34715128]. CCS activity is regulated by ubiquitination: XIAP-mediated ubiquitination enhances its chaperone function while TRIM22-mediated K27-linked ubiquitination at Lys76 targets it for proteasomal degradation, lowering ROS scavenging [PMID:20154138, PMID:39127340]. A human domain II mutation, p.Arg163Trp, impairs SOD1 binding and constitutes the first pathogenic mutation identified in a copper chaperone gene, converting CCS into a copper-scavenging 'anti-chaperone' that accelerates SOD1 deactivation [PMID:22508683, PMID:39099176].","teleology":[{"year":1998,"claim":"Established that CCS physically engages SOD1, defining the substrate-recognition basis of copper chaperone function and showing it also binds FALS mutant SOD1.","evidence":"Reciprocal Co-IP and in vitro binding with sequence alignment of homologous dimerization domains","pmids":["9726962"],"confidence":"High","gaps":["Did not resolve whether binding alone or copper transfer drives SOD1 activation","Functional consequence for FALS mutant maturation not addressed"]},{"year":1999,"claim":"Defined the domain II SOD1-like architecture and explained why an Asp200 substitution for a copper-binding histidine prevents CCS from acquiring its own SOD activity.","evidence":"Site-directed mutagenesis (D200H) in yeast with SOD activity assays; companion homology modelling of three structural domains","pmids":["10601249","10467139"],"confidence":"High","gaps":["Copper-transfer pathway from homology model lacks experimental structural validation","Domain-by-domain contribution to copper handling not dissected in vivo"]},{"year":2001,"claim":"Showed CCS levels govern SOD1 accumulation in the mitochondrial IMS, linking the chaperone to compartment-specific antioxidant protection.","evidence":"Subcellular fractionation with genetic CCS repression, protein carbonyl and survival assays in yeast","pmids":["11500508"],"confidence":"High","gaps":["Mechanism of CCS mitochondrial import not yet defined","Relevance to mammalian IMS not tested here"]},{"year":2004,"claim":"Resolved the catalytic core of maturation—Cu-CCS oxidatively forms the SOD1 disulfide bond and this requires molecular oxygen, defining CCS as an O2-dependent disulfide-forming chaperone.","evidence":"In vitro reconstitution with purified proteins, redox-state and monomer-dimer analysis, plus O2-tension dose-response in cell extracts and translation-blocking experiments","pmids":["15215895","15064408"],"confidence":"High","gaps":["Source of the oxidizing equivalent in vivo not fully defined","How CCS coordinates copper insertion with disulfide isomerization step-by-step unresolved"]},{"year":2004,"claim":"Identified a parallel CCS-independent, glutathione-dependent SOD1 activation route and the SOD1 sequence determinant that gates use of each pathway.","evidence":"Expression of human SOD1 in CCS-null yeast and mammalian cells, GSH depletion, and C-terminal proline mutagenesis","pmids":["15069187"],"confidence":"High","gaps":["Physiological balance between CCS-dependent and -independent routes in human tissues unknown"]},{"year":2008,"claim":"Separated CCS's copper-insertion catalysis from a copper-independent molecular chaperone activity, and revealed that CCS overexpression is toxic in an ALS mouse model with respiratory-chain consequences.","evidence":"G93A/CCS transgenic mice with in vivo SOD1 disulfide redox analysis and detergent-solubility assays using a C244,246S CCS mutant; respiratory complex assays, BN-PAGE and heme A analysis of spinal cord","pmids":["18337307","18334481"],"confidence":"High","gaps":["Mechanism linking CCS overexpression to isolated complex IV deficiency not established","How copper-insertion-independent chaperone activity prevents misfolding mechanistically unclear"]},{"year":2009,"claim":"Confirmed that disulfide oxidation by CCS strictly requires both copper and oxygen, while the alternative pathway can act anaerobically, and pinpointed a SOD1 proline dictating the requirement.","evidence":"Yeast expression under anaerobic and copper-depleted conditions with SOD1 proline mutagenesis and activity assays","pmids":["19542232"],"confidence":"High","gaps":["Identity of the in vivo electron acceptor not defined","Mammalian counterpart of the proline determinant not tested"]},{"year":2010,"claim":"Integrated CCS into the Mia40/Erv1 disulfide relay, explaining redox-dependent control of CCS mitochondrial import and downstream SOD1 IMS retention.","evidence":"Review synthesis of fractionation and genetic analyses in yeast and mammalian cells","pmids":["20367259"],"confidence":"Medium","gaps":["Review-level synthesis; individual experiments not detailed here","Direct CCS-Mia40 contact sites not mapped"]},{"year":2010,"claim":"Revealed regulatory ubiquitination of CCS by XIAP that enhances rather than degrades, and bidirectional copper delivery from CCS to XIAP.","evidence":"Reciprocal Co-IP, ubiquitination assays, and SOD1 activity readouts with XIAP manipulation in cells","pmids":["20154138"],"confidence":"High","gaps":["Ubiquitin linkage type and CCS acceptor residue not defined","How ubiquitination mechanistically boosts chaperone activity unknown"]},{"year":2012,"claim":"Identified the first human pathogenic mutation in a copper chaperone gene, tying CCS dysfunction to disease through impaired SOD1 binding.","evidence":"Immunoprecipitation, patient fibroblast biochemistry, and yeast complementation of the R163W variant","pmids":["22508683"],"confidence":"High","gaps":["Clinical spectrum and penetrance not established by a single case","Molecular basis of the binding defect not yet resolved here"]},{"year":2015,"claim":"Demonstrated cross-pathway copper exchange between CCS domain I and the cytosolic chaperone Atox1, situating CCS within the broader copper-trafficking network.","evidence":"NMR, size-exclusion chromatography copper-loading readouts, and Cys→Ala mutagenesis of Atox1 in vitro","pmids":["25673218"],"confidence":"Medium","gaps":["In vitro only; cellular relevance of Atox1-CCS exchange untested","Directionality control in vivo unknown"]},{"year":2017,"claim":"Provided structural in-cell evidence that CCS domain II stabilizes apo/mutant SOD1 and promotes zinc binding, formalizing a chaperone role distinct from copper insertion; also discovered S-acylation and an ultrastable SOD1-CCS heterodimer in spinal cord.","evidence":"In-cell and in vitro NMR with SOD1 mutants; acyl-RAC across human/mouse spinal cord plus cysteine mutagenesis in HEK293 cells","pmids":["29234142","28120938"],"confidence":"High","gaps":["Enzyme catalyzing CCS S-acylation not identified","Physiological role of the ultrastable heterodimer unresolved"]},{"year":2019,"claim":"Reconstituted the copper hand-off from Ctr1 to CCS to SOD1, showing a tripartite transfer intermediate that disassembles only when SOD1 is fully activated.","evidence":"In vitro reconstitution and pulldown/co-elution with purified Ctr1 cytosolic tail, CCS, and engineered immature SOD1","pmids":["31292775"],"confidence":"High","gaps":["Cellular validation of the heterotrimer not shown","Kinetics of complex assembly/disassembly not quantified"]},{"year":2020,"claim":"Showed CCS-promoted high-affinity zinc binding is disrupted by diverse fALS SOD1 mutations, proposing nonproductive maturation as a shared disease link.","evidence":"Zinc affinity measurements of wild-type and fALS SOD1 mutants ± CCS","pmids":["32121118"],"confidence":"Medium","gaps":["Single primary method (affinity measurement) from one lab","Causal link to aggregation/toxicity in vivo not demonstrated"]},{"year":2021,"claim":"Extended CCS copper delivery beyond SOD1 to MEK1, connecting the chaperone to MAPK signaling.","evidence":"SPR binding, BioID proximity labeling, CCS Cu-binding mutants and a small-molecule inhibitor with MEK1 kinase assays","pmids":["34715128"],"confidence":"High","gaps":["Structural basis of CCS-MEK1 copper transfer not resolved","Physiological signaling contexts requiring CCS-MEK1 not defined"]},{"year":2024,"claim":"Defined a second regulatory ubiquitination axis (TRIM22 K27-linked at Lys76) driving CCS degradation with consequences for ROS and STAT3 signaling, and mechanistically explained R163W as an anti-chaperone.","evidence":"Proteomics, Co-IP, ubiquitination assays and mutagenesis (TRIM22 coiled-coil, CCS Lys76) with ROS/STAT3 readouts; comprehensive Cu(I)/Zn binding and disulfide analysis of R163W","pmids":["39127340","39099176"],"confidence":"High","gaps":["Interplay between XIAP and TRIM22 ubiquitination of CCS unknown","Whether anti-chaperone mechanism generalizes to other domain II mutations untested"]},{"year":null,"claim":"How CCS integrates its multiple roles—SOD1 maturation, mitochondrial IMS retention, MEK1 copper delivery, and opposing ubiquitin regulation—within a single cell, and how the in vivo oxidizing equivalent and import machinery are coordinated, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of a full Ctr1-CCS-SOD1 transfer complex in cells","Relative flux through CCS-dependent vs GSH-dependent SOD1 activation in human tissues unquantified","Mechanistic basis of CCS overexpression toxicity and complex IV deficiency unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,5,9]},{"term_id":"GO:0140104","term_label":"molecular carrier activity","supporting_discovery_ids":[0,13,16,18]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[7,14,17]},{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[4,9]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[13,16]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[3,10]}],"pathway":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,5]}],"complexes":[],"partners":["SOD1","CTR1","ATOX1","XIAP","TRIM22","MEK1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14618","full_name":"Copper chaperone for superoxide dismutase","aliases":["Superoxide dismutase copper chaperone"],"length_aa":274,"mass_kda":29.0,"function":"Delivers copper to copper zinc superoxide dismutase (SOD1)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O14618/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CCS","classification":"Not Classified","n_dependent_lines":120,"n_total_lines":1208,"dependency_fraction":0.09933774834437085},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CCS","total_profiled":1310},"omim":[{"mim_id":"614482","title":"HUPPKE-BRENDEL SYNDROME; HPBDS","url":"https://www.omim.org/entry/614482"},{"mim_id":"609541","title":"SPASTIC PARAPLEGIA, OPTIC ATROPHY, AND NEUROPATHY; SPOAN","url":"https://www.omim.org/entry/609541"},{"mim_id":"607543","title":"SPONDYLOMETAPHYSEAL DYSPLASIA WITH BOWED FOREARMS AND FACIAL DYSMORPHISM","url":"https://www.omim.org/entry/607543"},{"mim_id":"605882","title":"BRCA1-INTERACTING PROTEIN 1; BRIP1","url":"https://www.omim.org/entry/605882"},{"mim_id":"605434","title":"CLASPIN; CLSPN","url":"https://www.omim.org/entry/605434"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CCS"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O14618","domains":[{"cath_id":"3.30.70.100","chopping":"11-83_237-252","consensus_level":"high","plddt":86.6474,"start":11,"end":252},{"cath_id":"2.60.40.200","chopping":"87-231","consensus_level":"high","plddt":96.7295,"start":87,"end":231}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14618","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14618-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14618-F1-predicted_aligned_error_v6.png","plddt_mean":87.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CCS","jax_strain_url":"https://www.jax.org/strain/search?query=CCS"},"sequence":{"accession":"O14618","fasta_url":"https://rest.uniprot.org/uniprotkb/O14618.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14618/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14618"}},"corpus_meta":[{"pmid":"11500508","id":"PMC_11500508","title":"A fraction of yeast Cu,Zn-superoxide dismutase and its metallochaperone, CCS, localize to the intermembrane space of mitochondria. 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Part A, Chemistry, analysis, control, exposure & risk assessment","url":"https://pubmed.ncbi.nlm.nih.gov/41747154","citation_count":0,"is_preprint":false},{"pmid":"41454861","id":"PMC_41454861","title":"Systemic Risks of Excessive CCS Deployment in Power-Sector Decarbonization.","date":"2025","source":"Environmental science & technology","url":"https://pubmed.ncbi.nlm.nih.gov/41454861","citation_count":0,"is_preprint":false},{"pmid":"42144443","id":"PMC_42144443","title":"CCS facilitates the progression of ovarian cancer by suppressing ferroptotic cell death via the modulation of p53-mediated expression of SLC7A11 and GPX4.","date":"2026","source":"Acta pharmacologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/42144443","citation_count":0,"is_preprint":false},{"pmid":"40211889","id":"PMC_40211889","title":"Generalization of the CCS-Mass Equation to Account for Variations in Molecular Density in an Iron-Ligand Complex Growing System.","date":"2025","source":"Rapid communications in mass spectrometry : RCM","url":"https://pubmed.ncbi.nlm.nih.gov/40211889","citation_count":0,"is_preprint":false},{"pmid":"2447566","id":"PMC_2447566","title":"Solid-phase methods for sequencing nucleic acids. 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Chemical degradation of synthetic DNA-RNA hybrid fragments using CCS and DE 81 anion-exchange papers.","date":"1987","source":"Nucleic acids symposium series","url":"https://pubmed.ncbi.nlm.nih.gov/2447566","citation_count":0,"is_preprint":false},{"pmid":"41020828","id":"PMC_41020828","title":"The Role of Targeted Therapy and Immunotherapy in Metastatic GNET/Clear Cell Sarcoma (CCS) of the Gastrointestinal Tract: A Case Report.","date":"2025","source":"Current issues in molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/41020828","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49008,"output_tokens":5199,"usd":0.112504,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13648,"output_tokens":5128,"usd":0.09822,"stage2_stop_reason":"end_turn"},"total_usd":0.210724,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"CCS (copper chaperone for SOD1) directly interacts with SOD1 in vitro and in vivo, and this interaction is mediated via the homologous SOD1-like domain in CCS. CCS also interacts with FALS mutant forms of SOD1.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, amino acid sequence alignment identifying homologous dimerization domains\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP plus in vitro binding, replicated across wild-type and multiple FALS mutant SOD1 variants in a single focused study\",\n      \"pmids\": [\"9726962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CCS domain II shares ~50% identity with SOD1 and contains all zinc-binding ligands but only three of four copper-binding histidines (the fourth is Asp200). A D200H mutation in CCS confers superoxide dismutase activity without abolishing copper chaperone function, indicating Asp200 evolved to preclude deleterious copper reactions in CCS.\",\n      \"method\": \"Site-directed mutagenesis of CCS expressed in yeast, SOD activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro/yeast enzymatic assay with mutagenesis, single lab but multiple functional readouts\",\n      \"pmids\": [\"10601249\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CCS contains three structural domains; a homology model based on bacterial mercury-detoxification proteins and SOD structure predicts a copper-transfer pathway involving sulfur ligands, accounting for electrostatic target recognition, copper storage, and transfer to SOD.\",\n      \"method\": \"Homology modelling of CCS three-dimensional structure\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational prediction only, no experimental structural or mutagenesis validation reported in this abstract\",\n      \"pmids\": [\"10467139\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"A fraction of CCS and active SOD1 co-localizes to the mitochondrial intermembrane space (IMS) in yeast. Mitochondrial accumulation of SOD1 is strongly influenced by CCS: repression of CCS reduces IMS SOD1, while high mitochondrial CCS increases IMS SOD1. IMS SOD1 is protective against mitochondrial oxidative damage.\",\n      \"method\": \"Subcellular fractionation, genetic repression of CCS expression, protein carbonyl assays, survival assays in stationary-phase yeast\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct fractionation plus genetic manipulation with quantitative functional readouts, mechanistic link between CCS levels and SOD1 IMS localization established\",\n      \"pmids\": [\"11500508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The Cu-bound form of CCS (Cu-CCS) mediates oxidative formation of the conserved disulfide bond in SOD1 in vivo and in vitro, even in the presence of excess reductants. Cu-CCS facilitates cysteine oxidation and disulfide isomerization in a stepwise conversion of immature SOD1 to the active state. The disulfide status of SOD1 significantly affects the monomer-dimer equilibrium, CCS interaction, and enzyme activity.\",\n      \"method\": \"Biochemical activity assays with purified proteins in vitro and yeast in vivo, redox state analysis, monomer-dimer equilibrium measurement\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified proteins plus in vivo yeast genetics, multiple orthogonal methods in one rigorous study\",\n      \"pmids\": [\"15215895\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CCS mediates posttranslational activation of SOD1 in response to increases in oxygen tension; O2 (or superoxide) is required for SOD1 activation by CCS. Existing apo-pools of SOD1 are activated by CCS early in the oxidative response, prior to new SOD1 protein synthesis.\",\n      \"method\": \"Activity assays with pure proteins and cell extracts, translational blocking experiments, dose-response studies with O2 tension\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro assay with purified proteins plus cell extract experiments, multiple orthogonal approaches identifying O2-dependent activation function of CCS\",\n      \"pmids\": [\"15064408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In the absence of CCS, mammalian SOD1 can be activated through a secondary CCS-independent pathway involving glutathione (GSH). Yeast SOD1 cannot use this pathway due to dual prolines near the C-terminus; insertion of these prolines into human SOD1 renders it refractory to CCS-independent activation.\",\n      \"method\": \"Expression of human SOD1 in CCS-null yeast and mammalian cells, GSH depletion experiments, proline mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic complementation in CCS-null yeast and mammalian fibroblasts plus mutagenesis, multiple orthogonal approaches\",\n      \"pmids\": [\"15069187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CCS over-expression in G93A SOD1 mice accelerates ALS disease and correlates with incomplete oxidation of the SOD1 intra-subunit disulfide in brain and spinal cord. A C244,246S CCS mutant that can interact with SOD1 but cannot insert copper or oxidize the disulfide still prevents SOD1 misfolding (detergent insolubility), indicating a copper-insertion-independent molecular chaperone function of CCS.\",\n      \"method\": \"Transgenic mouse model (G93A/CCS), redox state analysis of SOD1 disulfide in vivo, cell culture with CCS mutants, detergent solubility assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo mouse genetics plus cell culture with defined CCS mutants, multiple orthogonal readouts identifying novel chaperone activity independent of copper insertion\",\n      \"pmids\": [\"18337307\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Overexpression of CCS in G93A SOD1 mice causes an isolated cytochrome c oxidase (complex IV) deficiency in spinal cord, with 55% reduction in complex IV activity and marked reductions in COX1 and COX5b subunits, while activities of complexes I, II, III, and V are unaffected.\",\n      \"method\": \"Enzymatic activity assays of respiratory chain complexes, blue native PAGE, SDS-PAGE Western blotting, heme A analysis of spinal cord from CCS/G93A SOD1 transgenic mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical methods (enzyme assays, BN-PAGE, Western blot, heme analysis) in transgenic mouse model\",\n      \"pmids\": [\"18334481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CCS-dependent SOD1 activation requires molecular oxygen and results in disulfide oxidation dependent on both copper and O2, whereas the CCS-independent pathway can activate SOD1 under anaerobic conditions without forming the disulfide via CCS. Both pathways acquire copper from the same intracellular pool derived from cell-surface transporters. A proline at position 144 in yeast SOD1 is responsible for the strict copper/oxygen/CCS requirement for disulfide formation.\",\n      \"method\": \"Yeast expression system, anaerobic growth conditions, copper-depletion studies, mutagenesis of SOD1 proline residue, activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vivo yeast genetics with mutagenesis and anaerobic conditions, multiple orthogonal approaches in one focused study\",\n      \"pmids\": [\"19542232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"CCS mitochondrial distribution and IMS import is regulated by the Mia40/Erv1 disulfide relay system in a redox-dependent manner, and CCS in turn promotes SOD1 maturation and retention in the IMS through disulfide bond formation.\",\n      \"method\": \"Fractionation, genetic analyses in yeast and mammalian cells (review synthesis of mechanistic studies)\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — review integrating multiple experimental findings but individual experiments not directly described in this abstract\",\n      \"pmids\": [\"20367259\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"XIAP E3 ubiquitin ligase ubiquitinates CCS; this ubiquitination enhances CCS chaperone activity toward SOD1 rather than targeting CCS for proteasomal degradation. CCS mediates copper delivery to XIAP in cells.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assays, SOD1 activity assays in cells with XIAP manipulation\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, functional ubiquitination assay with chaperone activity readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20154138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"A human CCS mutation (p.Arg163Trp) in domain II impairs CCS binding to SOD1, reduces CCS expression, and reduces SOD1 activity. This is the first human pathogenic mutation identified in a copper chaperone gene. CCS R163W fails to complement yeast Lys7Δ mutant.\",\n      \"method\": \"Immunoprecipitation, mammalian cell transfection, patient fibroblast biochemical analysis, yeast complementation assay\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP, yeast complementation, patient cell biochemistry) in a single rigorous study\",\n      \"pmids\": [\"22508683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The first domain of CCS (CCS1) is monomeric and can exchange copper with the cytosolic chaperone Atox1 in vitro; Cu transfer occurs in both directions and requires intact metal-binding cysteines. Full-length CCS also participates in this cross-pathway Cu exchange.\",\n      \"method\": \"NMR, size exclusion chromatography with 254/280 nm ratio as Cu loading indicator, Cys→Ala mutagenesis of Atox1\",\n      \"journal\": \"Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR and biochemical assay in vitro, single lab, novel finding but limited to in vitro conditions\",\n      \"pmids\": [\"25673218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The SOD1-like domain of CCS (CCS-D2) forms a stable complex with zinc-bound SOD1 in human cells (shown by in-cell NMR), stabilizes mutant apo-SOD1 prior to zinc binding, prevents accumulation of unstructured mutant SOD1, and promotes zinc binding—demonstrating a molecular chaperone function distinct from copper insertion.\",\n      \"method\": \"In-cell NMR, in vitro NMR, cell-based stability assays for SOD1 mutants\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in-cell NMR and in vitro NMR with multiple SOD1 mutants, novel mechanistic finding with direct structural evidence\",\n      \"pmids\": [\"29234142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SOD1 and CCS are S-acylated (palmitoylated) in human and mouse spinal cords. SOD1 and CCS form a highly stable heterodimer in human spinal cord that resists boiling, denaturants, and reducing agents; S-acylation is highest for SOD1-CCS heterodimers. CCS cysteine mutations that attenuate SOD1 maturation prevent heterodimer formation.\",\n      \"method\": \"Acyl resin-assisted capture (acyl-RAC) assay on human post-mortem and mouse spinal cord, HEK293 cell in vitro assays, cysteine mutagenesis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — acyl-RAC biochemical assay across human and mouse tissues plus mutagenesis, multiple orthogonal methods\",\n      \"pmids\": [\"28120938\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CCS stably interacts with the cytosolic C-terminal tail of the copper importer Ctr1 (Ctr1c) in a copper-dependent manner; this interaction becomes tripartite (Cu(I)-Ctr1c·CCS·SOD1 heterotrimer) upon addition of immature SOD1. Only complete SOD1 activation (copper delivery + disulfide bond formation) breaks the Ctr1c·CCS·SOD1 complex, indicating that activated SOD1 terminates the Ctr1-CCS interaction.\",\n      \"method\": \"Biochemical reconstitution in solution, pulldown/co-elution assays with purified proteins, engineered immature SOD1 forms\",\n      \"journal\": \"Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with purified recombinant proteins, multiple complex assembly states tested, single lab but rigorous biochemistry\",\n      \"pmids\": [\"31292775\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Binding of SOD1 by CCS stabilizes a conformation of SOD1 that promotes site-specific high-affinity zinc binding. Several fALS-linked SOD1 mutations disrupt this CCS-promoted high-affinity zinc binding, suggesting that nonproductive Sod1 maturation by Ccs may be a common link across diverse fALS mutations.\",\n      \"method\": \"Zinc affinity measurements of wild-type and fALS SOD1 mutants in the presence or absence of CCS, biochemical binding assays\",\n      \"journal\": \"Molecules (Basel, Switzerland)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — quantitative zinc affinity measurements with multiple SOD1 mutants, single lab, single primary method\",\n      \"pmids\": [\"32121118\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CCS selectively binds to MEK1 and facilitates copper transfer to MEK1, promoting MEK1 kinase activity. CCS mutants that disrupt Cu(I) acquisition and exchange, or a CCS small-molecule inhibitor, reduce Cu-stimulated MEK1 kinase activity.\",\n      \"method\": \"Surface plasmon resonance, proximity-dependent biotin ligase (BioID) studies, CCS Cu-binding mutants, small-molecule CCS inhibitor, MEK1 kinase activity assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SPR binding assay plus proximity labeling plus functional kinase assay with CCS mutants and inhibitor, multiple orthogonal methods in one study\",\n      \"pmids\": [\"34715128\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The pathogenic CCS variant R163W loses Zn binding at its SOD1-like domain (D2), gains unusually high-affinity Cu(I) binding in D2 with accompanying disulfide bond formation, and this diverts R163W CCS from copper chaperone to copper scavenger that accelerates SOD1 deactivation—acting as an 'anti-chaperone'.\",\n      \"method\": \"Comprehensive structural and biochemical analysis including Cu(II)→Cu(I) reduction assays, Zn binding measurements, disulfide detection, aggregation assays\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biochemical and structural methods on purified protein, mechanistic model directly supported by experimental data\",\n      \"pmids\": [\"39099176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The E3 ubiquitin ligase TRIM22 ubiquitinates CCS via K27-linked ubiquitination at Lys76 of CCS, targeting it for proteasomal degradation. TRIM22-mediated CCS degradation reduces ROS scavenging, increases reactive oxygen species, and inhibits STAT3 phosphorylation in breast cancer cells. The coiled-coil domain of TRIM22 is required for CCS ubiquitination.\",\n      \"method\": \"Label-free proteomics, Co-IP, ubiquitination assays, mutagenesis of TRIM22 coiled-coil domain and CCS Lys76, ROS assays, STAT3 phosphorylation assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods (proteomics, Co-IP, ubiquitination assay, mutagenesis, functional readouts) in one study\",\n      \"pmids\": [\"39127340\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CCS is a multi-domain copper chaperone that directly binds immature SOD1 via its SOD1-like domain (domain II), acquires Cu(I) from the Ctr1 copper importer, transfers copper to SOD1, and catalyzes formation of SOD1's essential intra-subunit disulfide bond in an O2-dependent manner; it also acts as a molecular chaperone to stabilize apo-SOD1 and promote zinc binding, facilitates SOD1 import and retention in the mitochondrial IMS through the Mia40/Erv1 redox relay, delivers copper to MEK1/2 kinases to modulate MAPK signaling, is subject to regulatory ubiquitination by XIAP (enhancing chaperone activity) and TRIM22 (targeting it for degradation), and is S-acylated in human spinal cord where it forms a stable heterodimer with SOD1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CCS is a copper chaperone that delivers copper to and catalyzes the maturation of the antioxidant enzyme SOD1 [#0, #4]. It recognizes immature SOD1 through its SOD1-homologous domain II, which retains all zinc-binding ligands but substitutes Asp200 for one of the four copper-binding histidines, an evolutionary change that precludes deleterious copper chemistry within CCS itself [#0, #1]. The copper-loaded form of CCS catalyzes the oxidative formation of SOD1's conserved intra-subunit disulfide bond, converting apo-SOD1 to the active enzyme in a strictly oxygen-dependent reaction; existing apo-SOD1 pools are activated by CCS early in the oxidative response prior to new protein synthesis [#4, #5]. CCS acquires its copper from a cell-surface-derived intracellular pool, interacting with the cytosolic tail of the importer Ctr1 to form a Cu(I)-Ctr1\\u00b7CCS\\u00b7SOD1 transfer intermediate that disassembles only upon complete SOD1 activation, and it can also exchange copper bidirectionally with the cytosolic chaperone Atox1 [#13, #16]. Beyond metal insertion, CCS acts as a molecular chaperone that stabilizes apo-SOD1, prevents accumulation of unstructured mutant protein, and promotes site-specific high-affinity zinc binding\\u2014a function independent of copper insertion [#7, #14, #17]. CCS additionally promotes SOD1 maturation and retention in the mitochondrial intermembrane space, where it is itself imported under control of the Mia40/Erv1 disulfide relay [#3, #10], and delivers copper to MEK1 to support its kinase activity [#18]. CCS activity is regulated by ubiquitination: XIAP-mediated ubiquitination enhances its chaperone function while TRIM22-mediated K27-linked ubiquitination at Lys76 targets it for proteasomal degradation, lowering ROS scavenging [#11, #20]. A human domain II mutation, p.Arg163Trp, impairs SOD1 binding and constitutes the first pathogenic mutation identified in a copper chaperone gene, converting CCS into a copper-scavenging 'anti-chaperone' that accelerates SOD1 deactivation [#12, #19].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established that CCS physically engages SOD1, defining the substrate-recognition basis of copper chaperone function and showing it also binds FALS mutant SOD1.\",\n      \"evidence\": \"Reciprocal Co-IP and in vitro binding with sequence alignment of homologous dimerization domains\",\n      \"pmids\": [\"9726962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether binding alone or copper transfer drives SOD1 activation\", \"Functional consequence for FALS mutant maturation not addressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the domain II SOD1-like architecture and explained why an Asp200 substitution for a copper-binding histidine prevents CCS from acquiring its own SOD activity.\",\n      \"evidence\": \"Site-directed mutagenesis (D200H) in yeast with SOD activity assays; companion homology modelling of three structural domains\",\n      \"pmids\": [\"10601249\", \"10467139\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Copper-transfer pathway from homology model lacks experimental structural validation\", \"Domain-by-domain contribution to copper handling not dissected in vivo\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed CCS levels govern SOD1 accumulation in the mitochondrial IMS, linking the chaperone to compartment-specific antioxidant protection.\",\n      \"evidence\": \"Subcellular fractionation with genetic CCS repression, protein carbonyl and survival assays in yeast\",\n      \"pmids\": [\"11500508\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of CCS mitochondrial import not yet defined\", \"Relevance to mammalian IMS not tested here\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Resolved the catalytic core of maturation\\u2014Cu-CCS oxidatively forms the SOD1 disulfide bond and this requires molecular oxygen, defining CCS as an O2-dependent disulfide-forming chaperone.\",\n      \"evidence\": \"In vitro reconstitution with purified proteins, redox-state and monomer-dimer analysis, plus O2-tension dose-response in cell extracts and translation-blocking experiments\",\n      \"pmids\": [\"15215895\", \"15064408\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Source of the oxidizing equivalent in vivo not fully defined\", \"How CCS coordinates copper insertion with disulfide isomerization step-by-step unresolved\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Identified a parallel CCS-independent, glutathione-dependent SOD1 activation route and the SOD1 sequence determinant that gates use of each pathway.\",\n      \"evidence\": \"Expression of human SOD1 in CCS-null yeast and mammalian cells, GSH depletion, and C-terminal proline mutagenesis\",\n      \"pmids\": [\"15069187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological balance between CCS-dependent and -independent routes in human tissues unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Separated CCS's copper-insertion catalysis from a copper-independent molecular chaperone activity, and revealed that CCS overexpression is toxic in an ALS mouse model with respiratory-chain consequences.\",\n      \"evidence\": \"G93A/CCS transgenic mice with in vivo SOD1 disulfide redox analysis and detergent-solubility assays using a C244,246S CCS mutant; respiratory complex assays, BN-PAGE and heme A analysis of spinal cord\",\n      \"pmids\": [\"18337307\", \"18334481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking CCS overexpression to isolated complex IV deficiency not established\", \"How copper-insertion-independent chaperone activity prevents misfolding mechanistically unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Confirmed that disulfide oxidation by CCS strictly requires both copper and oxygen, while the alternative pathway can act anaerobically, and pinpointed a SOD1 proline dictating the requirement.\",\n      \"evidence\": \"Yeast expression under anaerobic and copper-depleted conditions with SOD1 proline mutagenesis and activity assays\",\n      \"pmids\": [\"19542232\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the in vivo electron acceptor not defined\", \"Mammalian counterpart of the proline determinant not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Integrated CCS into the Mia40/Erv1 disulfide relay, explaining redox-dependent control of CCS mitochondrial import and downstream SOD1 IMS retention.\",\n      \"evidence\": \"Review synthesis of fractionation and genetic analyses in yeast and mammalian cells\",\n      \"pmids\": [\"20367259\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review-level synthesis; individual experiments not detailed here\", \"Direct CCS-Mia40 contact sites not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Revealed regulatory ubiquitination of CCS by XIAP that enhances rather than degrades, and bidirectional copper delivery from CCS to XIAP.\",\n      \"evidence\": \"Reciprocal Co-IP, ubiquitination assays, and SOD1 activity readouts with XIAP manipulation in cells\",\n      \"pmids\": [\"20154138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin linkage type and CCS acceptor residue not defined\", \"How ubiquitination mechanistically boosts chaperone activity unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the first human pathogenic mutation in a copper chaperone gene, tying CCS dysfunction to disease through impaired SOD1 binding.\",\n      \"evidence\": \"Immunoprecipitation, patient fibroblast biochemistry, and yeast complementation of the R163W variant\",\n      \"pmids\": [\"22508683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Clinical spectrum and penetrance not established by a single case\", \"Molecular basis of the binding defect not yet resolved here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated cross-pathway copper exchange between CCS domain I and the cytosolic chaperone Atox1, situating CCS within the broader copper-trafficking network.\",\n      \"evidence\": \"NMR, size-exclusion chromatography copper-loading readouts, and Cys\\u2192Ala mutagenesis of Atox1 in vitro\",\n      \"pmids\": [\"25673218\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vitro only; cellular relevance of Atox1-CCS exchange untested\", \"Directionality control in vivo unknown\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided structural in-cell evidence that CCS domain II stabilizes apo/mutant SOD1 and promotes zinc binding, formalizing a chaperone role distinct from copper insertion; also discovered S-acylation and an ultrastable SOD1-CCS heterodimer in spinal cord.\",\n      \"evidence\": \"In-cell and in vitro NMR with SOD1 mutants; acyl-RAC across human/mouse spinal cord plus cysteine mutagenesis in HEK293 cells\",\n      \"pmids\": [\"29234142\", \"28120938\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Enzyme catalyzing CCS S-acylation not identified\", \"Physiological role of the ultrastable heterodimer unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Reconstituted the copper hand-off from Ctr1 to CCS to SOD1, showing a tripartite transfer intermediate that disassembles only when SOD1 is fully activated.\",\n      \"evidence\": \"In vitro reconstitution and pulldown/co-elution with purified Ctr1 cytosolic tail, CCS, and engineered immature SOD1\",\n      \"pmids\": [\"31292775\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular validation of the heterotrimer not shown\", \"Kinetics of complex assembly/disassembly not quantified\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Showed CCS-promoted high-affinity zinc binding is disrupted by diverse fALS SOD1 mutations, proposing nonproductive maturation as a shared disease link.\",\n      \"evidence\": \"Zinc affinity measurements of wild-type and fALS SOD1 mutants \\u00b1 CCS\",\n      \"pmids\": [\"32121118\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single primary method (affinity measurement) from one lab\", \"Causal link to aggregation/toxicity in vivo not demonstrated\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended CCS copper delivery beyond SOD1 to MEK1, connecting the chaperone to MAPK signaling.\",\n      \"evidence\": \"SPR binding, BioID proximity labeling, CCS Cu-binding mutants and a small-molecule inhibitor with MEK1 kinase assays\",\n      \"pmids\": [\"34715128\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of CCS-MEK1 copper transfer not resolved\", \"Physiological signaling contexts requiring CCS-MEK1 not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a second regulatory ubiquitination axis (TRIM22 K27-linked at Lys76) driving CCS degradation with consequences for ROS and STAT3 signaling, and mechanistically explained R163W as an anti-chaperone.\",\n      \"evidence\": \"Proteomics, Co-IP, ubiquitination assays and mutagenesis (TRIM22 coiled-coil, CCS Lys76) with ROS/STAT3 readouts; comprehensive Cu(I)/Zn binding and disulfide analysis of R163W\",\n      \"pmids\": [\"39127340\", \"39099176\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Interplay between XIAP and TRIM22 ubiquitination of CCS unknown\", \"Whether anti-chaperone mechanism generalizes to other domain II mutations untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CCS integrates its multiple roles\\u2014SOD1 maturation, mitochondrial IMS retention, MEK1 copper delivery, and opposing ubiquitin regulation\\u2014within a single cell, and how the in vivo oxidizing equivalent and import machinery are coordinated, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of a full Ctr1-CCS-SOD1 transfer complex in cells\", \"Relative flux through CCS-dependent vs GSH-dependent SOD1 activation in human tissues unquantified\", \"Mechanistic basis of CCS overexpression toxicity and complex IV deficiency unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 5, 9]},\n      {\"term_id\": \"GO:0140104\", \"supporting_discovery_ids\": [0, 13, 16, 18]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [7, 14, 17]},\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [4, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [13, 16]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [3, 10]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SOD1\", \"Ctr1\", \"Atox1\", \"XIAP\", \"TRIM22\", \"MEK1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":8,"faith_total":8,"faith_pct":100.0}}