{"gene":"TBCC","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":1996,"finding":"TBCC (cofactor C) is an essential post-chaperonin factor in the beta-tubulin folding pathway. After ATP-dependent interaction with the cytosolic chaperonin, folding intermediates interact sequentially with cofactors A, D, E, and C. Cofactor E binds the cofactor D–beta-tubulin complex; interaction with cofactor C (TBCC) then releases beta-tubulin polypeptides committed to the native state. The postchaperonin steps do not require ATP or GTP hydrolysis, though GTP plays a structural role.","method":"In vitro reconstitution of the complete beta-tubulin folding pathway using purified cofactors; biochemical cascade assembly assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 — full in vitro reconstitution of the folding pathway with multiple purified components; foundational study replicated by subsequent work","pmids":["8706133"],"is_preprint":false},{"year":1996,"finding":"TBCC (cofactor C) collaborates with cofactors A, B, D, and E as a post-chaperonin factor mediating the folding of both alpha- and beta-tubulin monomers into polymerization-competent heterodimers.","method":"In vitro chaperonin-mediated folding assay with purified cofactors; reconstitution experiments","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution, consistent with the Cell 1996 study, independently reported","pmids":["8567715"],"is_preprint":false},{"year":2002,"finding":"TBCC (cofactor C), together with cofactor D, stimulates the GTPase activity of native tubulin. A conserved arginine residue acts as an 'arginine finger' to trigger tubulin GTPase activity; mutation of this arginine abolishes the GTPase-stimulating function. TBCC partially complements deletion of its yeast homolog in vivo, demonstrating functional conservation.","method":"In vitro GTPase activity assay with purified TBCC and cofactor D; site-directed mutagenesis of conserved arginine; yeast complementation assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro enzyme assay combined with mutagenesis and in vivo genetic complementation","pmids":["11847227"],"is_preprint":false},{"year":2002,"finding":"TBCC (cofactor C) localizes predominantly to the photoreceptor connecting cilium in rod and cone photoreceptors of the human retina, in a cytoplasmic distribution distinct from the plasma membrane localization of its paralog RP2. Loss of RP2 does not affect TBCC expression levels in patient-derived lymphoblastoid cells.","method":"Immunolocalization in human retinal tissue sections; Western blot of patient-derived cell lines","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 — direct immunolocalization in native tissue; single study","pmids":["12417528"],"is_preprint":false},{"year":2010,"finding":"Overexpression of TBCC in human breast cancer cells shifts tubulin fraction distribution toward higher nonpolymerizable tubulin content and lower polymerizable dimers and microtubules, reduces microtubule dynamicity, alters cell cycle distribution (more cells in G2-M, fewer in S-phase), slows mitotic progression, significantly delays in vivo xenograft tumor growth, and enhances sensitivity to antimicrotubule agents both in vitro and in vivo.","method":"Stable overexpression of TBCC in breast cancer cell lines; lysate fractionation for tubulin pools; time-lapse microscopy for microtubule dynamicity; flow cytometry for cell cycle; mouse xenograft tumor growth assay; in vitro and in vivo chemosensitivity assays","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods in a single lab; gain-of-function with defined molecular and cellular phenotypes","pmids":["20384997"],"is_preprint":false},{"year":2011,"finding":"The NMR solution structure of the TBCC N-terminal domain reveals a spectrin-like fold composed of a left-handed 3-stranded alpha-helix bundle, with a flexible 30-residue N-terminal segment that is disordered in solution. This unstructured N-terminal region directly participates in the interaction with tubulin monomers, and the highly charged N-terminus together with residues from the three helices and loops is proposed to interact with the acidic hypervariable regions of tubulin. TBCC depletion causes multipolar spindles and mitotic failure, and TBCC is found at the centrosome and is required for bipolar spindle formation.","method":"NMR structure determination; TBCC knockdown with mitotic phenotype analysis; immunofluorescence localization to centrosome","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with functional validation by mutagenesis-informed binding analysis and KD phenotype; multiple orthogonal methods","pmids":["22028797"],"is_preprint":false},{"year":2009,"finding":"ASQ2 in Chlamydomonas encodes Tbccd1, a conserved protein belonging to the TBCC protein family (including tubulin folding cochaperone and RP2). Loss of Tbccd1/Asq2 causes defects in mother-daughter centriole linkage, variable centriole numbers, centriole positioning defects, and mitotic spindle orientation errors. Cells lacking centrioles at both poles have improperly positioned spindles, indicating that centriole linkage mediated by Tbccd1 is required for correct spindle orientation.","method":"Genetic mutant analysis in Chlamydomonas; electron microscopy of centriole structure; live-cell imaging of mitosis; epistasis analysis of centriole number and spindle orientation","journal":"Current biology : CB","confidence":"Medium","confidence_rationale":"Tier 2 — loss-of-function with defined structural and functional phenotypes in a model organism ortholog; single study","pmids":["19631545"],"is_preprint":false},{"year":2019,"finding":"TBCC is a direct target of miR-1251-5p in ovarian cancer cells. Exogenous overexpression of TBCC inhibits CDK4 and LC3B-II expression, promotes alpha/beta-tubulin expression, and suppresses p62 levels, thereby inhibiting cell cycle progression and autophagy (particularly under nutrient starvation). Re-introduction of miR-1251-5p into TBCC-overexpressing cells reverses these effects. In xenograft models, miR-1251-5p enhances tumor growth by downregulating TBCC, with corresponding upregulation of Ki67 and LC3B in tumor tissues.","method":"miRNA overexpression/inhibition; exogenous TBCC overexpression; Western blot for CDK4, LC3B-II, p62, alpha/beta-tubulin; cell proliferation and cell cycle assays; xenograft tumor growth in vivo","journal":"Molecular therapy : the journal of the American Society of Gene Therapy","confidence":"Medium","confidence_rationale":"Tier 2 — gain-of-function and rescue experiments with multiple protein readouts; in vivo validation; single lab","pmids":["31278033"],"is_preprint":false},{"year":2015,"finding":"Large-scale affinity-purification mass spectrometry (BioPlex) identified TBCC as part of the human interactome network in HEK293T cells, co-purifying with interaction partners consistent with its role in tubulin folding complexes.","method":"High-throughput affinity-purification mass spectrometry (AP-MS) in HEK293T cells","journal":"Cell","confidence":"Low","confidence_rationale":"Tier 3 — high-throughput AP-MS without targeted follow-up validation for TBCC specifically","pmids":["26186194"],"is_preprint":false}],"current_model":"TBCC (tubulin binding cofactor C) is a post-chaperonin factor that acts in a defined sequence with cofactors A, B, D, and E to fold alpha- and beta-tubulin monomers into polymerization-competent heterodimers; its N-terminal spectrin-like domain (whose NMR structure is solved) engages tubulin via a disordered, highly charged N-terminal segment, and together with cofactor D it stimulates tubulin GTPase activity via a conserved 'arginine finger'; TBCC localizes to the centrosome and connecting cilium, is required for bipolar spindle formation, and its levels control the balance of polymerizable versus nonpolymerizable tubulin pools, with consequences for microtubule dynamics, cell cycle progression, autophagy (via regulation of CDK4 and LC3B), and tumor growth."},"narrative":{"teleology":[{"year":1996,"claim":"Establishing TBCC as an essential component of the post-chaperonin tubulin folding pathway resolved how β-tubulin acquires its native conformation through an ordered cofactor cascade (A→D→E→C) downstream of the cytosolic chaperonin.","evidence":"In vitro reconstitution of the complete β-tubulin folding pathway with purified cofactors; independently confirmed for both α- and β-tubulin","pmids":["8706133","8567715"],"confidence":"High","gaps":["Stoichiometry and transient complexes formed between TBCC and cofactors D/E during the release step were not resolved","Whether TBCC cycles catalytically or acts stoichiometrically in vivo was not determined"]},{"year":2002,"claim":"Demonstrating that TBCC stimulates tubulin GTPase activity via a conserved arginine finger, and that this residue is essential, established the catalytic mechanism by which TBCC triggers heterodimer release and revealed functional conservation from yeast to human.","evidence":"In vitro GTPase assay with purified TBCC and cofactor D; site-directed mutagenesis of the arginine finger; yeast complementation","pmids":["11847227"],"confidence":"High","gaps":["Atomic-resolution structure of the TBCC–cofactor D–tubulin ternary complex remains unsolved","Contribution of GTP hydrolysis versus GTP-dependent conformational change to heterodimer commitment was not separated"]},{"year":2002,"claim":"Localization of TBCC to the photoreceptor connecting cilium placed it at a site of intense tubulin demand, suggesting a tissue-specific role distinct from its paralog RP2.","evidence":"Immunolocalization in human retinal sections; Western blot in RP2-patient lymphoblastoid cells","pmids":["12417528"],"confidence":"Medium","gaps":["Functional consequence of TBCC loss specifically in photoreceptors has not been tested","Mechanism of TBCC targeting to the connecting cilium is unknown"]},{"year":2009,"claim":"Loss of the TBCC-family member Tbccd1/Asq2 in Chlamydomonas linked the TBCC protein family to centriole linkage and spindle orientation, broadening its role beyond tubulin folding to centrosome biology.","evidence":"Genetic mutant analysis in Chlamydomonas; electron microscopy of centriole structure; live-cell imaging of mitosis","pmids":["19631545"],"confidence":"Medium","gaps":["Tbccd1 is a TBCC-family member, not TBCC itself; direct extrapolation to mammalian TBCC requires caution","Whether the centriole-linkage function depends on tubulin-folding activity or is a separable role is unresolved"]},{"year":2010,"claim":"TBCC overexpression in breast cancer cells demonstrated that TBCC levels control the balance between polymerizable and nonpolymerizable tubulin pools, directly affecting microtubule dynamics, mitotic progression, and xenograft tumor growth.","evidence":"Stable TBCC overexpression; tubulin fractionation; time-lapse microscopy; flow cytometry; mouse xenograft assays","pmids":["20384997"],"confidence":"Medium","gaps":["Whether endogenous TBCC downregulation is a driver event in breast tumorigenesis or a bystander change is unknown","Loss-of-function data in the same system were not provided"]},{"year":2011,"claim":"The NMR structure of the TBCC N-terminal domain revealed a spectrin-like three-helix bundle with a disordered, charged N-terminal segment that mediates tubulin binding, and TBCC depletion established its requirement for bipolar spindle formation at the centrosome.","evidence":"NMR solution structure; TBCC knockdown with spindle phenotype analysis; immunofluorescence centrosome localization","pmids":["22028797"],"confidence":"High","gaps":["High-resolution structure of TBCC in complex with tubulin or cofactor D is still lacking","How TBCC is recruited to and retained at the centrosome is mechanistically uncharacterized"]},{"year":2019,"claim":"Identification of TBCC as a direct miR-1251-5p target in ovarian cancer linked TBCC loss to CDK4 upregulation, enhanced autophagy, and accelerated tumor growth, extending its functional reach beyond tubulin folding to cell-cycle and autophagy regulation.","evidence":"miRNA overexpression/inhibition and TBCC rescue; Western blot for CDK4, LC3B-II, p62; xenograft tumor models","pmids":["31278033"],"confidence":"Medium","gaps":["Whether TBCC regulation of CDK4 and autophagy is mediated through tubulin pools or through a tubulin-independent mechanism is not determined","The miR-1251-5p–TBCC axis has been characterized by a single laboratory"]},{"year":null,"claim":"A high-resolution structure of the TBCC–cofactor D–tubulin ternary complex is needed to understand how GTPase stimulation and heterodimer release are coupled, and whether TBCC's centrosomal and cell-cycle functions are mechanistically separable from its tubulin-folding role remains an open question.","evidence":"","pmids":[],"confidence":"Low","gaps":["No cryo-EM or crystal structure of a mammalian TBCC–cofactor D–tubulin complex exists","Separation-of-function mutants distinguishing folding, GTPase, and centrosomal roles have not been generated","In vivo quantitative contribution of TBCC to total tubulin heterodimer flux is unmeasured"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,2]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5,6]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[3]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[0,1,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[4,5]}],"complexes":[],"partners":["TBCD","TBCE","TUBA1A","TUBB"],"other_free_text":[]},"mechanistic_narrative":"TBCC (tubulin-specific chaperone C / cofactor C) is a post-chaperonin factor that acts in a defined sequential pathway with cofactors A, B, D, and E to fold α- and β-tubulin monomers into polymerization-competent heterodimers [PMID:8706133, PMID:8567715]. Together with cofactor D, TBCC stimulates tubulin GTPase activity through a conserved arginine-finger residue, and its N-terminal spectrin-like domain engages tubulin via a disordered, highly charged segment [PMID:11847227, PMID:22028797]. TBCC localizes to the centrosome and the photoreceptor connecting cilium, and its depletion causes multipolar spindles and mitotic failure, while its overexpression shifts tubulin pools toward nonpolymerizable forms, reduces microtubule dynamicity, inhibits CDK4-dependent cell-cycle progression and autophagy, and delays xenograft tumor growth [PMID:22028797, PMID:20384997, PMID:31278033, PMID:12417528]."},"prefetch_data":{"uniprot":{"accession":"Q15814","full_name":"Tubulin-specific chaperone C","aliases":["Tubulin-folding cofactor C","CFC"],"length_aa":346,"mass_kda":39.2,"function":"Tubulin-folding protein; involved in the final step of the tubulin folding pathway","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q15814/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TBCC","classification":"Common Essential","n_dependent_lines":1155,"n_total_lines":1208,"dependency_fraction":0.9561258278145696},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"COPB2","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TBCC","total_profiled":1310},"omim":[{"mim_id":"619848","title":"TBCC DOMAIN-CONTAINING PROTEIN 1; TBCCD1","url":"https://www.omim.org/entry/619848"},{"mim_id":"610451","title":"TUBULIN FOLDING COFACTOR E-LIKE; TBCEL","url":"https://www.omim.org/entry/610451"},{"mim_id":"604934","title":"TUBULIN FOLDING COFACTOR E; TBCE","url":"https://www.omim.org/entry/604934"},{"mim_id":"604695","title":"ADP-RIBOSYLATION FACTOR-LIKE GTPase 3; ARL3","url":"https://www.omim.org/entry/604695"},{"mim_id":"604649","title":"TUBULIN FOLDING COFACTOR D; TBCD","url":"https://www.omim.org/entry/604649"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TBCC"},"hgnc":{"alias_symbol":["CFC"],"prev_symbol":[]},"alphafold":{"accession":"Q15814","domains":[{"cath_id":"1.20.58.1250","chopping":"30-132","consensus_level":"high","plddt":86.2196,"start":30,"end":132},{"cath_id":"2.160.20.70","chopping":"184-341","consensus_level":"high","plddt":95.0537,"start":184,"end":341}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15814","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q15814-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q15814-F1-predicted_aligned_error_v6.png","plddt_mean":81.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TBCC","jax_strain_url":"https://www.jax.org/strain/search?query=TBCC"},"sequence":{"accession":"Q15814","fasta_url":"https://rest.uniprot.org/uniprotkb/Q15814.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q15814/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q15814"}},"corpus_meta":[{"pmid":"10199408","id":"PMC_10199408","title":"The EGF-CFC protein one-eyed pinhead is essential for nodal signaling.","date":"1999","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/10199408","citation_count":606,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11062482","id":"PMC_11062482","title":"Loss-of-function mutations in the EGF-CFC gene CFC1 are associated with human left-right laterality defects.","date":"2000","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11062482","citation_count":255,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10521397","id":"PMC_10521397","title":"Conserved requirement for EGF-CFC genes in vertebrate left-right axis formation.","date":"1999","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/10521397","citation_count":212,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"10858660","id":"PMC_10858660","title":"The EGF-CFC gene family in vertebrate development.","date":"2000","source":"Trends in genetics : TIG","url":"https://pubmed.ncbi.nlm.nih.gov/10858660","citation_count":174,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12514096","id":"PMC_12514096","title":"EGF-CFC proteins are essential coreceptors for the TGF-beta signals Vg1 and GDF1.","date":"2003","source":"Genes & development","url":"https://pubmed.ncbi.nlm.nih.gov/12514096","citation_count":146,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"2665850","id":"PMC_2665850","title":"Detection of a human CFC with a high proliferative potential.","date":"1989","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/2665850","citation_count":142,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"12925698","id":"PMC_12925698","title":"Antibody blockade of the Cripto CFC domain suppresses tumor cell growth in vivo.","date":"2003","source":"The Journal of clinical investigation","url":"https://pubmed.ncbi.nlm.nih.gov/12925698","citation_count":138,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"2189013","id":"PMC_2189013","title":"Colony-forming cells with high proliferative potential (HPP-CFC).","date":"1990","source":"International journal of cell cloning","url":"https://pubmed.ncbi.nlm.nih.gov/2189013","citation_count":132,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11174844","id":"PMC_11174844","title":"The EGF-CFC family: novel epidermal growth factor-related proteins in development and cancer.","date":"2000","source":"Endocrine-related cancer","url":"https://pubmed.ncbi.nlm.nih.gov/11174844","citation_count":113,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"17366577","id":"PMC_17366577","title":"Molecular and clinical characterization of cardio-facio-cutaneous (CFC) syndrome: overlapping clinical manifestations with Costello syndrome.","date":"2007","source":"American journal of medical genetics. 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Studies on the effect of AcSDKP on GM-CFC and on the possible involvement of T-lymphocytes in AcSDKP response.","date":"1989","source":"Experimental hematology","url":"https://pubmed.ncbi.nlm.nih.gov/2583251","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"11024280","id":"PMC_11024280","title":"Subtractive hybridization identifies chick-cripto, a novel EGF-CFC ortholog expressed during gastrulation, neurulation and early cardiogenesis.","date":"2000","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/11024280","citation_count":48,"is_preprint":false,"source_track":"pubmed_title"},{"pmid":"15003316","id":"PMC_15003316","title":"Increased plasma levels of stromal-derived factor-1 (SDF-1/CXCL12) enhance human thrombopoiesis and mobilize human colony-forming cells (CFC) in NOD/SCID mice.","date":"2004","source":"Experimental 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communications","url":"https://pubmed.ncbi.nlm.nih.gov/35831314","citation_count":65,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"34373451","id":"PMC_34373451","title":"Integrative oncogene-dependency mapping identifies RIT1 vulnerabilities and synergies in lung cancer.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34373451","citation_count":36,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"36215168","id":"PMC_36215168","title":"TRIM67 drives tumorigenesis in oligodendrogliomas through Rho GTPase-dependent membrane blebbing.","date":"2023","source":"Neuro-oncology","url":"https://pubmed.ncbi.nlm.nih.gov/36215168","citation_count":25,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"35944360","id":"PMC_35944360","title":"TRABID targets DDB2 for deubiquitination to promote proliferation of hepatocellular carcinoma cells.","date":"2022","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/35944360","citation_count":9,"is_preprint":false,"source_track":"gene2pubmed"},{"pmid":"22028797","id":"PMC_22028797","title":"The solution structure of the N-terminal domain of human tubulin binding cofactor C reveals a platform for tubulin interaction.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22028797","citation_count":8,"is_preprint":false,"source_track":"gene2pubmed"}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":47553,"output_tokens":994,"usd":0.078784},"stage2":{"model":"claude-opus-4-6","input_tokens":4198,"output_tokens":1313,"usd":0.080723},"total_usd":0.393309,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard","round2_stage1":{"model":"claude-sonnet-4-6","input_tokens":56088,"output_tokens":2912,"usd":0.105972},"round2_rules_fired":"R3","round2_stage2":{"model":"claude-opus-4-6","input_tokens":6014,"output_tokens":2206,"usd":0.12783}},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"TBCC (tubulin binding cofactor C) overexpression increases the pool of non-polymerizable tubulin and reduces polymerizable dimers and microtubules, decreases microtubule dynamicity, alters cell cycle distribution (higher G2-M, lower S-phase fraction), slows passage into mitosis, and suppresses tumor growth in xenograft models while enhancing sensitivity to antimicrotubule agents.\",\n      \"method\": \"TBCC overexpression in human breast cancer cells; lysate fractionation of tubulin pools; time-lapse microscopy of microtubule dynamics; flow cytometry for cell cycle; xenograft tumor growth assays; in vitro and in vivo chemosensitivity assays\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (fractionation, live imaging, flow cytometry, in vivo xenografts) in a single study with functional phenotypic readouts\",\n      \"pmids\": [\"20384997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TBCC functions as a tumor suppressor by promoting α/β-tubulin expression and suppressing CDK4 and LC3BII; miR-1251-5p targets TBCC to suppress its expression, thereby promoting cell cycle progression and autophagy in ovarian cancer cells. Exogenous TBCC overexpression inhibits cell growth and autophagy, and these effects are rescued by miR-1251-5p re-introduction.\",\n      \"method\": \"miR-1251-5p overexpression/inhibition; exogenous TBCC overexpression; western blotting for CDK4, LC3BII, α/β-tubulin, p62; cell proliferation and cell cycle assays; xenograft tumor growth with Ki67 and LC3B IHC\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple methods but single lab; mechanistic link between TBCC, tubulin, and cell cycle/autophagy established by rescue experiments\",\n      \"pmids\": [\"31278033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ASQ2/Tbccd1 (a TBCC-like family member) is required for mother-daughter centriole linkage; loss of Tbccd1 causes variable centriole numbers, centriole positioning defects, and mitotic spindle orientation defects. Cells with centrioles at both poles had properly positioned spindles, indicating centriole linkage by Tbccd1 is important for spindle orientation.\",\n      \"method\": \"Genetic mutant characterization (asq2 in Chlamydomonas); live-cell imaging of centrioles and mitotic spindles; quantification of centriole numbers and positions\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined cellular phenotype (centriole linkage, spindle orientation) in a model organism ortholog; single lab\",\n      \"pmids\": [\"19631545\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBCC (tubulin binding cofactor C) is a chaperone cofactor essential for proper folding of α/β-tubulin heterodimers; its activity controls the balance between non-polymerizable tubulin monomers and polymerization-competent dimers/microtubules, thereby regulating microtubule dynamicity, cell cycle progression (particularly G2-M transit), and sensitivity to antimicrotubule agents, and it acts as a tumor suppressor whose downregulation by miR-1251-5p promotes cell proliferation and autophagy in cancer cells.\"\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\nI'll classify each paper and extract discoveries only from KEEP papers.\n\n**Classification:**\n- Papers [1]-[9], [11]-[15] (EGF-CFC family, CFC syndrome via BRAF/MEK, HPP-CFC hematopoietic, capillary filtration coefficient, chlorofluorocarbons, etc.) = EXCLUDE (alias collisions or unrelated)\n- Corpus paper [30] (TBCC/miR-1251-5p/ovarian cancer) = KEEP\n- Corpus paper [46] (ASQ2/Tbccd1/TBCC-like) = KEEP (ortholog in C. reinhardtii, functionally consistent)\n- Corpus paper [51] (TBCC in breast cancer) = KEEP\n- Additional paper [8] (beta-tubulin folding pathway, cofactor C = TBCC) = KEEP\n- Additional paper [12] (RP2 homologue cofactor C in retina) = KEEP\n- Additional paper [13] (chaperonin-mediated folding) = KEEP (foundational)\n- Additional paper [14] (functional overlap RP2 and cofactor C) = KEEP\n- Additional paper [20] (NMR structure of TBCC N-terminal domain) = KEEP\n- Additional papers [2],[3],[4] (BioPlex interactome, TBCC interactions) = KEEP\n- Additional papers [1],[6] (MGC cDNA) = EXCLUDE (no mechanistic findings)\n- Additional papers [5],[7] (GO, OpenCell) = borderline; OpenCell [7] includes localization data = KEEP for localization\n- Additional papers [9],[10],[11],[15],[16],[17],[18],[19] = EXCLUDE (not about TBCC)\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1996,\n      \"finding\": \"TBCC (cofactor C) is an essential post-chaperonin factor in the beta-tubulin folding pathway. After ATP-dependent interaction with the cytosolic chaperonin, folding intermediates interact sequentially with cofactors A, D, E, and C. Cofactor E binds the cofactor D–beta-tubulin complex; interaction with cofactor C (TBCC) then releases beta-tubulin polypeptides committed to the native state. The postchaperonin steps do not require ATP or GTP hydrolysis, though GTP plays a structural role.\",\n      \"method\": \"In vitro reconstitution of the complete beta-tubulin folding pathway using purified cofactors; biochemical cascade assembly assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — full in vitro reconstitution of the folding pathway with multiple purified components; foundational study replicated by subsequent work\",\n      \"pmids\": [\"8706133\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"TBCC (cofactor C) collaborates with cofactors A, B, D, and E as a post-chaperonin factor mediating the folding of both alpha- and beta-tubulin monomers into polymerization-competent heterodimers.\",\n      \"method\": \"In vitro chaperonin-mediated folding assay with purified cofactors; reconstitution experiments\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution, consistent with the Cell 1996 study, independently reported\",\n      \"pmids\": [\"8567715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TBCC (cofactor C), together with cofactor D, stimulates the GTPase activity of native tubulin. A conserved arginine residue acts as an 'arginine finger' to trigger tubulin GTPase activity; mutation of this arginine abolishes the GTPase-stimulating function. TBCC partially complements deletion of its yeast homolog in vivo, demonstrating functional conservation.\",\n      \"method\": \"In vitro GTPase activity assay with purified TBCC and cofactor D; site-directed mutagenesis of conserved arginine; yeast complementation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro enzyme assay combined with mutagenesis and in vivo genetic complementation\",\n      \"pmids\": [\"11847227\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"TBCC (cofactor C) localizes predominantly to the photoreceptor connecting cilium in rod and cone photoreceptors of the human retina, in a cytoplasmic distribution distinct from the plasma membrane localization of its paralog RP2. Loss of RP2 does not affect TBCC expression levels in patient-derived lymphoblastoid cells.\",\n      \"method\": \"Immunolocalization in human retinal tissue sections; Western blot of patient-derived cell lines\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct immunolocalization in native tissue; single study\",\n      \"pmids\": [\"12417528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Overexpression of TBCC in human breast cancer cells shifts tubulin fraction distribution toward higher nonpolymerizable tubulin content and lower polymerizable dimers and microtubules, reduces microtubule dynamicity, alters cell cycle distribution (more cells in G2-M, fewer in S-phase), slows mitotic progression, significantly delays in vivo xenograft tumor growth, and enhances sensitivity to antimicrotubule agents both in vitro and in vivo.\",\n      \"method\": \"Stable overexpression of TBCC in breast cancer cell lines; lysate fractionation for tubulin pools; time-lapse microscopy for microtubule dynamicity; flow cytometry for cell cycle; mouse xenograft tumor growth assay; in vitro and in vivo chemosensitivity assays\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods in a single lab; gain-of-function with defined molecular and cellular phenotypes\",\n      \"pmids\": [\"20384997\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The NMR solution structure of the TBCC N-terminal domain reveals a spectrin-like fold composed of a left-handed 3-stranded alpha-helix bundle, with a flexible 30-residue N-terminal segment that is disordered in solution. This unstructured N-terminal region directly participates in the interaction with tubulin monomers, and the highly charged N-terminus together with residues from the three helices and loops is proposed to interact with the acidic hypervariable regions of tubulin. TBCC depletion causes multipolar spindles and mitotic failure, and TBCC is found at the centrosome and is required for bipolar spindle formation.\",\n      \"method\": \"NMR structure determination; TBCC knockdown with mitotic phenotype analysis; immunofluorescence localization to centrosome\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with functional validation by mutagenesis-informed binding analysis and KD phenotype; multiple orthogonal methods\",\n      \"pmids\": [\"22028797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"ASQ2 in Chlamydomonas encodes Tbccd1, a conserved protein belonging to the TBCC protein family (including tubulin folding cochaperone and RP2). Loss of Tbccd1/Asq2 causes defects in mother-daughter centriole linkage, variable centriole numbers, centriole positioning defects, and mitotic spindle orientation errors. Cells lacking centrioles at both poles have improperly positioned spindles, indicating that centriole linkage mediated by Tbccd1 is required for correct spindle orientation.\",\n      \"method\": \"Genetic mutant analysis in Chlamydomonas; electron microscopy of centriole structure; live-cell imaging of mitosis; epistasis analysis of centriole number and spindle orientation\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss-of-function with defined structural and functional phenotypes in a model organism ortholog; single study\",\n      \"pmids\": [\"19631545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TBCC is a direct target of miR-1251-5p in ovarian cancer cells. Exogenous overexpression of TBCC inhibits CDK4 and LC3B-II expression, promotes alpha/beta-tubulin expression, and suppresses p62 levels, thereby inhibiting cell cycle progression and autophagy (particularly under nutrient starvation). Re-introduction of miR-1251-5p into TBCC-overexpressing cells reverses these effects. In xenograft models, miR-1251-5p enhances tumor growth by downregulating TBCC, with corresponding upregulation of Ki67 and LC3B in tumor tissues.\",\n      \"method\": \"miRNA overexpression/inhibition; exogenous TBCC overexpression; Western blot for CDK4, LC3B-II, p62, alpha/beta-tubulin; cell proliferation and cell cycle assays; xenograft tumor growth in vivo\",\n      \"journal\": \"Molecular therapy : the journal of the American Society of Gene Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain-of-function and rescue experiments with multiple protein readouts; in vivo validation; single lab\",\n      \"pmids\": [\"31278033\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Large-scale affinity-purification mass spectrometry (BioPlex) identified TBCC as part of the human interactome network in HEK293T cells, co-purifying with interaction partners consistent with its role in tubulin folding complexes.\",\n      \"method\": \"High-throughput affinity-purification mass spectrometry (AP-MS) in HEK293T cells\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — high-throughput AP-MS without targeted follow-up validation for TBCC specifically\",\n      \"pmids\": [\"26186194\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TBCC (tubulin binding cofactor C) is a post-chaperonin factor that acts in a defined sequence with cofactors A, B, D, and E to fold alpha- and beta-tubulin monomers into polymerization-competent heterodimers; its N-terminal spectrin-like domain (whose NMR structure is solved) engages tubulin via a disordered, highly charged N-terminal segment, and together with cofactor D it stimulates tubulin GTPase activity via a conserved 'arginine finger'; TBCC localizes to the centrosome and connecting cilium, is required for bipolar spindle formation, and its levels control the balance of polymerizable versus nonpolymerizable tubulin pools, with consequences for microtubule dynamics, cell cycle progression, autophagy (via regulation of CDK4 and LC3B), and tumor growth.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TBCC (tubulin binding cofactor C) is a tubulin-folding chaperone cofactor that regulates the balance between non-polymerizable tubulin monomers and polymerization-competent αβ-tubulin heterodimers, thereby controlling microtubule dynamicity and cell cycle progression [PMID:20384997]. Overexpression of TBCC increases the non-polymerizable tubulin pool, decreases microtubule dynamics, delays G2-to-M transition, suppresses tumor growth in xenograft models, and enhances sensitivity to antimicrotubule agents [PMID:20384997]. TBCC functions as a tumor suppressor whose downregulation by miR-1251-5p promotes CDK4 expression, autophagy, and cell proliferation in ovarian cancer, effects that are reversed by exogenous TBCC re-expression [PMID:31278033].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Whether the TBCC protein family contributes to centrosome biology was unknown; characterization of the TBCC-domain protein Tbccd1/ASQ2 revealed a role in mother-daughter centriole linkage and consequent spindle orientation, extending the functional scope of the TBCC family beyond tubulin folding.\",\n      \"evidence\": \"Genetic loss-of-function of asq2/Tbccd1 in Chlamydomonas with live-cell imaging of centriole number, position, and spindle orientation\",\n      \"pmids\": [\"19631545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether mammalian TBCC itself (rather than TBCC-domain relatives) plays a direct role at centrioles remains untested\",\n        \"Mechanism by which Tbccd1 maintains centriole linkage is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"How TBCC affects tubulin pools, microtubule dynamics, and cell proliferation was unclear; overexpression studies established that TBCC shifts the tubulin equilibrium toward non-polymerizable monomers, suppresses microtubule dynamicity, delays mitotic entry, and inhibits tumor growth while sensitizing cells to antimicrotubule drugs.\",\n      \"evidence\": \"TBCC overexpression in human breast cancer cells with tubulin fractionation, time-lapse microtubule imaging, flow cytometry, and xenograft assays\",\n      \"pmids\": [\"20384997\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No loss-of-function data in mammalian cells to confirm these phenotypes are physiologically relevant\",\n        \"The stoichiometric requirements of TBCC relative to other tubulin cofactors (TBCD, TBCE) in vivo are unresolved\",\n        \"No structural model explains how TBCC modulates tubulin heterodimer release\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether TBCC is regulated post-transcriptionally in cancer was unknown; identification of miR-1251-5p as a direct TBCC suppressor linked TBCC loss to CDK4 upregulation, increased autophagy, and accelerated proliferation, establishing TBCC as a tumor suppressor in ovarian cancer.\",\n      \"evidence\": \"miR-1251-5p overexpression/inhibition, TBCC rescue, western blotting for CDK4/LC3BII/tubulin, and xenograft assays in ovarian cancer cells\",\n      \"pmids\": [\"31278033\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism linking TBCC to CDK4 suppression is not elucidated\",\n        \"Generalizability of the tumor-suppressor role beyond breast and ovarian cancer lines is untested\",\n        \"How TBCC influences autophagy at a molecular level is unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which TBCC regulates CDK4 levels and autophagy, the structural basis of its tubulin-cofactor activity, and whether it has direct roles at centrosomes in mammalian cells remain open questions.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No reconstituted biochemical assay for human TBCC tubulin-folding activity\",\n        \"No structural model of TBCC bound to tubulin or other cofactors\",\n        \"No genetic loss-of-function studies in mammalian systems\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}\n```\n\n--- ROUND 2 (R2/R3, augmented corpus) ---\n\n```json\n{\n  \"mechanistic_narrative\": \"TBCC (tubulin-specific chaperone C / cofactor C) is a post-chaperonin factor that acts in a defined sequential pathway with cofactors A, B, D, and E to fold α- and β-tubulin monomers into polymerization-competent heterodimers [PMID:8706133, PMID:8567715]. Together with cofactor D, TBCC stimulates tubulin GTPase activity through a conserved arginine-finger residue, and its N-terminal spectrin-like domain engages tubulin via a disordered, highly charged segment [PMID:11847227, PMID:22028797]. TBCC localizes to the centrosome and the photoreceptor connecting cilium, and its depletion causes multipolar spindles and mitotic failure, while its overexpression shifts tubulin pools toward nonpolymerizable forms, reduces microtubule dynamicity, inhibits CDK4-dependent cell-cycle progression and autophagy, and delays xenograft tumor growth [PMID:22028797, PMID:20384997, PMID:31278033, PMID:12417528].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing TBCC as an essential component of the post-chaperonin tubulin folding pathway resolved how β-tubulin acquires its native conformation through an ordered cofactor cascade (A→D→E→C) downstream of the cytosolic chaperonin.\",\n      \"evidence\": \"In vitro reconstitution of the complete β-tubulin folding pathway with purified cofactors; independently confirmed for both α- and β-tubulin\",\n      \"pmids\": [\"8706133\", \"8567715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Stoichiometry and transient complexes formed between TBCC and cofactors D/E during the release step were not resolved\",\n        \"Whether TBCC cycles catalytically or acts stoichiometrically in vivo was not determined\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrating that TBCC stimulates tubulin GTPase activity via a conserved arginine finger, and that this residue is essential, established the catalytic mechanism by which TBCC triggers heterodimer release and revealed functional conservation from yeast to human.\",\n      \"evidence\": \"In vitro GTPase assay with purified TBCC and cofactor D; site-directed mutagenesis of the arginine finger; yeast complementation\",\n      \"pmids\": [\"11847227\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Atomic-resolution structure of the TBCC–cofactor D–tubulin ternary complex remains unsolved\",\n        \"Contribution of GTP hydrolysis versus GTP-dependent conformational change to heterodimer commitment was not separated\"\n      ]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Localization of TBCC to the photoreceptor connecting cilium placed it at a site of intense tubulin demand, suggesting a tissue-specific role distinct from its paralog RP2.\",\n      \"evidence\": \"Immunolocalization in human retinal sections; Western blot in RP2-patient lymphoblastoid cells\",\n      \"pmids\": [\"12417528\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Functional consequence of TBCC loss specifically in photoreceptors has not been tested\",\n        \"Mechanism of TBCC targeting to the connecting cilium is unknown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Loss of the TBCC-family member Tbccd1/Asq2 in Chlamydomonas linked the TBCC protein family to centriole linkage and spindle orientation, broadening its role beyond tubulin folding to centrosome biology.\",\n      \"evidence\": \"Genetic mutant analysis in Chlamydomonas; electron microscopy of centriole structure; live-cell imaging of mitosis\",\n      \"pmids\": [\"19631545\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Tbccd1 is a TBCC-family member, not TBCC itself; direct extrapolation to mammalian TBCC requires caution\",\n        \"Whether the centriole-linkage function depends on tubulin-folding activity or is a separable role is unresolved\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"TBCC overexpression in breast cancer cells demonstrated that TBCC levels control the balance between polymerizable and nonpolymerizable tubulin pools, directly affecting microtubule dynamics, mitotic progression, and xenograft tumor growth.\",\n      \"evidence\": \"Stable TBCC overexpression; tubulin fractionation; time-lapse microscopy; flow cytometry; mouse xenograft assays\",\n      \"pmids\": [\"20384997\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether endogenous TBCC downregulation is a driver event in breast tumorigenesis or a bystander change is unknown\",\n        \"Loss-of-function data in the same system were not provided\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"The NMR structure of the TBCC N-terminal domain revealed a spectrin-like three-helix bundle with a disordered, charged N-terminal segment that mediates tubulin binding, and TBCC depletion established its requirement for bipolar spindle formation at the centrosome.\",\n      \"evidence\": \"NMR solution structure; TBCC knockdown with spindle phenotype analysis; immunofluorescence centrosome localization\",\n      \"pmids\": [\"22028797\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"High-resolution structure of TBCC in complex with tubulin or cofactor D is still lacking\",\n        \"How TBCC is recruited to and retained at the centrosome is mechanistically uncharacterized\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identification of TBCC as a direct miR-1251-5p target in ovarian cancer linked TBCC loss to CDK4 upregulation, enhanced autophagy, and accelerated tumor growth, extending its functional reach beyond tubulin folding to cell-cycle and autophagy regulation.\",\n      \"evidence\": \"miRNA overexpression/inhibition and TBCC rescue; Western blot for CDK4, LC3B-II, p62; xenograft tumor models\",\n      \"pmids\": [\"31278033\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether TBCC regulation of CDK4 and autophagy is mediated through tubulin pools or through a tubulin-independent mechanism is not determined\",\n        \"The miR-1251-5p–TBCC axis has been characterized by a single laboratory\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"A high-resolution structure of the TBCC–cofactor D–tubulin ternary complex is needed to understand how GTPase stimulation and heterodimer release are coupled, and whether TBCC's centrosomal and cell-cycle functions are mechanistically separable from its tubulin-folding role remains an open question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No cryo-EM or crystal structure of a mammalian TBCC–cofactor D–tubulin complex exists\",\n        \"Separation-of-function mutants distinguishing folding, GTPase, and centrosomal roles have not been generated\",\n        \"In vivo quantitative contribution of TBCC to total tubulin heterodimer flux is unmeasured\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [0, 1, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [4, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"TBCD\",\n      \"TBCE\",\n      \"TUBA1A\",\n      \"TUBB\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}