{"gene":"TF","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2003,"finding":"Human transferrin (Tf) binds the transferrin receptor expressed on mammalian cells and mediates internalization; a conjugate of Tf linked to a mutant diphtheria toxin (CRM107) via a thioester bond exhibited potent cytotoxicity at picomolar concentrations against cells expressing the transferrin receptor, demonstrating that Tf-receptor binding is sufficient to deliver a large protein payload intracellularly.","method":"In vitro cytotoxicity assay using Tf-CRM107 conjugate on mammalian cells expressing the transferrin receptor; Phase I/II clinical trials confirming receptor-mediated tumor cell killing","journal":"Journal of neuro-oncology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — functional receptor-binding demonstrated via cytotoxicity assay, replicated across preclinical and clinical settings, but mechanistic detail relies on ligand-receptor targeting rather than direct structural or biochemical reconstitution of Tf function","pmids":["14649881"],"is_preprint":false}],"current_model":"Transferrin (TF) functions as a serum iron-transport glycoprotein that binds and delivers iron to cells via the transferrin receptor; the available corpus provides limited direct mechanistic experimentation on TF itself, with the strongest functional evidence coming from its use as a receptor-targeting ligand (via Tf-CRM107 conjugates) demonstrating that Tf-transferrin receptor binding mediates efficient endocytic delivery of cargo into receptor-expressing cells."},"narrative":{"mechanistic_narrative":"Transferrin (TF) binds the transferrin receptor on mammalian cells and mediates receptor-dependent internalization, a property demonstrated functionally by conjugating Tf to a mutant diphtheria toxin (CRM107): the Tf-CRM107 conjugate was cytotoxic at picomolar concentrations against transferrin-receptor-expressing cells, establishing that Tf-receptor binding alone is sufficient to deliver a large protein payload into the cell interior via endocytosis [PMID:14649881]. Beyond this ligand-receptor binding and endocytic delivery activity [PMID:14649881], no further mechanistic detail of TF itself has been characterized in the available corpus.","teleology":[{"year":2003,"claim":"Established that Tf binding to the transferrin receptor is sufficient to drive efficient endocytic internalization of a bound macromolecular cargo, validating the receptor-ligand axis as a delivery route.","evidence":"In vitro cytotoxicity assay with a Tf-CRM107 (mutant diphtheria toxin) conjugate on receptor-expressing mammalian cells, with confirmation in Phase I/II clinical settings","pmids":["14649881"],"confidence":"Medium","gaps":["Mechanism inferred from a targeting conjugate rather than direct structural or biochemical reconstitution of native Tf function","Iron-binding and iron-delivery activity of TF not directly assayed in this corpus","Receptor-binding interface and endocytic trafficking steps not resolved structurally"]},{"year":null,"claim":"How TF binds, sequesters, and releases iron, and the structural basis of its interaction with the transferrin receptor, remain uncharacterized in the available corpus.","evidence":"No direct experimental evidence in the timeline","pmids":[],"confidence":"Low","gaps":["No direct biochemical demonstration of iron binding or release by TF","No structural model of the TF-receptor complex in this corpus","Endosomal pH-dependent iron unloading mechanism not addressed"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0]}],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P02787","full_name":"Serotransferrin","aliases":["Beta-1 metal-binding globulin","Siderophilin"],"length_aa":698,"mass_kda":77.1,"function":"Transferrins are iron binding transport proteins which can bind two Fe(3+) ions in association with the binding of an anion, usually bicarbonate. It is responsible for the transport of iron from sites of absorption and heme degradation to those of storage and utilization. Serum transferrin may also have a further role in stimulating cell proliferation (Microbial infection) Serves as an iron source for Neisseria species, which capture the protein and extract its iron for their own use (Microbial infection) Serves as an iron source for parasite T.brucei (strain 427), which capture TF via its own transferrin receptor ESAG6:ESAG7 and extract its iron for its own use","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P02787/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TF","classification":"Not Classified","n_dependent_lines":28,"n_total_lines":1208,"dependency_fraction":0.023178807947019868},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TF","total_profiled":1310},"omim":[{"mim_id":"621498","title":"REPLICATION TERMINATION FACTOR 2; RTF2","url":"https://www.omim.org/entry/621498"},{"mim_id":"621354","title":"NEURODEVELOPMENTAL DISORDER WITH GROWTH IMPAIRMENT, QUADRIPARESIS, AND POOR OR ABSENT SPEECH; NEDGQS","url":"https://www.omim.org/entry/621354"},{"mim_id":"621297","title":"LYMPHATIC ENDOTHELIAL TRANSCRIPTIONAL REGULATOR lncRNA 1; LETR1","url":"https://www.omim.org/entry/621297"},{"mim_id":"621247","title":"CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR 7; CPSF7","url":"https://www.omim.org/entry/621247"},{"mim_id":"621205","title":"MICRO RNA 129-2; MIR129-2","url":"https://www.omim.org/entry/621205"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":7020.0},{"tissue":"retina","ntpm":2256.7}],"url":"https://www.proteinatlas.org/search/TF"},"hgnc":{"alias_symbol":["PRO1557","PRO2086"],"prev_symbol":[]},"alphafold":{"accession":"P02787","domains":[{"cath_id":"3.40.190.10","chopping":"25-111_268-346","consensus_level":"high","plddt":94.1201,"start":25,"end":346},{"cath_id":"3.40.190.10","chopping":"114-266","consensus_level":"high","plddt":95.2116,"start":114,"end":266},{"cath_id":"3.40.190.10","chopping":"362-443_604-697","consensus_level":"high","plddt":94.6541,"start":362,"end":697},{"cath_id":"3.40.190.10","chopping":"450-602","consensus_level":"high","plddt":97.0128,"start":450,"end":602}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P02787","model_url":"https://alphafold.ebi.ac.uk/files/AF-P02787-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P02787-F1-predicted_aligned_error_v6.png","plddt_mean":93.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TF","jax_strain_url":"https://www.jax.org/strain/search?query=TF"},"sequence":{"accession":"P02787","fasta_url":"https://rest.uniprot.org/uniprotkb/P02787.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P02787/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P02787"}},"corpus_meta":[{"pmid":"1311101","id":"PMC_1311101","title":"Retinoid 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steroidogenesis.","date":"2004","source":"Endocrine research","url":"https://pubmed.ncbi.nlm.nih.gov/15666827","citation_count":16,"is_preprint":false},{"pmid":"37218712","id":"PMC_37218712","title":"Reversal of Cisplatin Resistance in Ovarian Cancer by the Multitargeted Nanodrug Delivery System Tf-Mn-MOF@Nira@CDDP.","date":"2023","source":"ACS applied materials & interfaces","url":"https://pubmed.ncbi.nlm.nih.gov/37218712","citation_count":16,"is_preprint":false},{"pmid":"32458278","id":"PMC_32458278","title":"Activation of β1 integrins and caveolin-1 by TF/FVIIa promotes IGF-1R signaling and cell survival.","date":"2020","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/32458278","citation_count":15,"is_preprint":false},{"pmid":"30367575","id":"PMC_30367575","title":"Single cell RNA-seq data clustering using TF-IDF based methods.","date":"2018","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/30367575","citation_count":15,"is_preprint":false},{"pmid":"30876925","id":"PMC_30876925","title":"Abiotic stress induced miRNA-TF-gene regulatory network: A structural perspective.","date":"2019","source":"Genomics","url":"https://pubmed.ncbi.nlm.nih.gov/30876925","citation_count":15,"is_preprint":false},{"pmid":"31380428","id":"PMC_31380428","title":"p38/TF/HIF-α Signaling Pathway Participates in the Progression of CIPN in Mice.","date":"2019","source":"BioMed research international","url":"https://pubmed.ncbi.nlm.nih.gov/31380428","citation_count":15,"is_preprint":false},{"pmid":"31161194","id":"PMC_31161194","title":"MTTFsite: cross-cell type TF binding site prediction by using multi-task learning.","date":"2019","source":"Bioinformatics (Oxford, England)","url":"https://pubmed.ncbi.nlm.nih.gov/31161194","citation_count":15,"is_preprint":false},{"pmid":"31595288","id":"PMC_31595288","title":"Annotations capturing cell type-specific TF binding explain a large fraction of disease heritability.","date":"2020","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31595288","citation_count":14,"is_preprint":false},{"pmid":"35511108","id":"PMC_35511108","title":"GraphTGI: an attention-based graph embedding model for predicting TF-target gene interactions.","date":"2022","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/35511108","citation_count":14,"is_preprint":false},{"pmid":"35359871","id":"PMC_35359871","title":"Paeoniflorin Inhibits ASK1-TF Axis by Up-Regulating SOCS3 to Alleviate Radiation Enteritis.","date":"2022","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/35359871","citation_count":14,"is_preprint":false},{"pmid":"36325562","id":"PMC_36325562","title":"Transcriptome analysis reveals the proline metabolic pathway and its potential regulation TF-hub genes in salt-stressed potato.","date":"2022","source":"Frontiers in plant science","url":"https://pubmed.ncbi.nlm.nih.gov/36325562","citation_count":13,"is_preprint":false},{"pmid":"11196414","id":"PMC_11196414","title":"Orphan receptors COUP-TF and DAX-1 as targets in disordered CYP17 expression in adrenocortical tumors.","date":"2000","source":"Endocrine research","url":"https://pubmed.ncbi.nlm.nih.gov/11196414","citation_count":13,"is_preprint":false},{"pmid":"23968943","id":"PMC_23968943","title":"Meta-analysis on the association between the TF gene rs1049296 and AD.","date":"2013","source":"The Canadian journal of neurological sciences. Le journal canadien des sciences neurologiques","url":"https://pubmed.ncbi.nlm.nih.gov/23968943","citation_count":12,"is_preprint":false},{"pmid":"38890797","id":"PMC_38890797","title":"The TF/Nrf2/GSTP1 pathway is involved in stress-induced hepatocellular injury through ferroptosis.","date":"2024","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38890797","citation_count":12,"is_preprint":false},{"pmid":"21552541","id":"PMC_21552541","title":"Modulation of COUP-TF expression in a cnidarian by ectopic Wnt signalling and allorecognition.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21552541","citation_count":12,"is_preprint":false},{"pmid":"38201433","id":"PMC_38201433","title":"TF/PAR2 Signaling Axis Supports the Protumor Effect of Neutrophil Extracellular Traps (NETs) on Human Breast Cancer Cells.","date":"2023","source":"Cancers","url":"https://pubmed.ncbi.nlm.nih.gov/38201433","citation_count":12,"is_preprint":false},{"pmid":"18647225","id":"PMC_18647225","title":"TF:FVIIa-specific activation of CREB upregulates proapoptotic proteins via protease-activated receptor-2.","date":"2008","source":"Journal of thrombosis and haemostasis : JTH","url":"https://pubmed.ncbi.nlm.nih.gov/18647225","citation_count":12,"is_preprint":false},{"pmid":"31407948","id":"PMC_31407948","title":"Adipocytes express tissue factor and FVII and are procoagulant in a TF/FVIIa-dependent manner.","date":"2019","source":"Upsala journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31407948","citation_count":11,"is_preprint":false},{"pmid":"31336830","id":"PMC_31336830","title":"Cross-Cell-Type Prediction of TF-Binding Site by Integrating Convolutional Neural Network and Adversarial Network.","date":"2019","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/31336830","citation_count":11,"is_preprint":false},{"pmid":"19366371","id":"PMC_19366371","title":"Expression of COUP-TF-interacting protein 2 (CTIP2) in human atopic dermatitis and allergic contact dermatitis skin.","date":"2009","source":"Experimental dermatology","url":"https://pubmed.ncbi.nlm.nih.gov/19366371","citation_count":11,"is_preprint":false},{"pmid":"36057196","id":"PMC_36057196","title":"Towards a better understanding of TF-DNA binding prediction from genomic features.","date":"2022","source":"Computers in biology and medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36057196","citation_count":10,"is_preprint":false},{"pmid":"30941015","id":"PMC_30941015","title":"TF-ChIP Method for Tissue-Specific Gene Targets.","date":"2019","source":"Frontiers in cellular neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/30941015","citation_count":10,"is_preprint":false},{"pmid":"18693120","id":"PMC_18693120","title":"Notch induces cell cycle arrest and apoptosis in human erythroleukaemic TF-1 cells.","date":"2008","source":"Blood cells, molecules & diseases","url":"https://pubmed.ncbi.nlm.nih.gov/18693120","citation_count":10,"is_preprint":false},{"pmid":"35163483","id":"PMC_35163483","title":"Genome-Wide ChIPseq Analysis of AhR, COUP-TF, and HNF4 Enrichment in TCDD-Treated Mouse Liver.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35163483","citation_count":10,"is_preprint":false},{"pmid":"10913260","id":"PMC_10913260","title":"COUP-TF plays a dual role in the regulation of the ovalbumin gene.","date":"2000","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10913260","citation_count":10,"is_preprint":false},{"pmid":"36100009","id":"PMC_36100009","title":"Impairments in operant probabilistic reversal learning in BTBR T+tf/J male and female mice.","date":"2022","source":"Behavioural brain research","url":"https://pubmed.ncbi.nlm.nih.gov/36100009","citation_count":10,"is_preprint":false},{"pmid":"11594755","id":"PMC_11594755","title":"Adhesion via CD43 induces Syk activation and cell proliferation in TF-1 cells.","date":"2001","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/11594755","citation_count":10,"is_preprint":false},{"pmid":"30852269","id":"PMC_30852269","title":"Domains of the TF protein important in regulating its own palmitoylation.","date":"2019","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/30852269","citation_count":9,"is_preprint":false},{"pmid":"36131924","id":"PMC_36131924","title":"Exploration of shared TF-miRNA‒mRNA and mRNA-RBP-pseudogene networks in type 2 diabetes mellitus and breast cancer.","date":"2022","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/36131924","citation_count":9,"is_preprint":false},{"pmid":"30781507","id":"PMC_30781507","title":"Activation of TF-Dependent Blood Coagulation Pathway and VEGF-A in Patients with Essential Thrombocythemia.","date":"2019","source":"Medicina (Kaunas, Lithuania)","url":"https://pubmed.ncbi.nlm.nih.gov/30781507","citation_count":9,"is_preprint":false},{"pmid":"35775375","id":"PMC_35775375","title":"Expression patterns of uPAR, TF and EGFR and their potential as targets for molecular imaging in oropharyngeal squamous cell carcinoma.","date":"2022","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/35775375","citation_count":9,"is_preprint":false},{"pmid":"33834194","id":"PMC_33834194","title":"Contribution of structural accessibility to the cooperative relationship of TF-lncRNA in myopia.","date":"2021","source":"Briefings in bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/33834194","citation_count":9,"is_preprint":false},{"pmid":"33278446","id":"PMC_33278446","title":"Molecular characterization and expression analysis of Tf_TLR4 and Tf_TRIL in yellow catfish Tachysurus fulvidraco responding to Edwardsiella ictaluri challenge.","date":"2020","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/33278446","citation_count":9,"is_preprint":false},{"pmid":"33850216","id":"PMC_33850216","title":"Association of common TMPRSS6 and TF gene variants with hepcidin and iron status in healthy rural Gambians.","date":"2021","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/33850216","citation_count":9,"is_preprint":false},{"pmid":"22119392","id":"PMC_22119392","title":"BMP-2 inhibits TF expression in human monocytes by shutting down MAPK signaling and AP-1 transcriptional activity.","date":"2011","source":"Thrombosis research","url":"https://pubmed.ncbi.nlm.nih.gov/22119392","citation_count":9,"is_preprint":false},{"pmid":"37693903","id":"PMC_37693903","title":"YKL-40 promotes chemokine expression following drug-induced liver injury via TF-PAR1 pathway in mice.","date":"2023","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/37693903","citation_count":8,"is_preprint":false},{"pmid":"36212136","id":"PMC_36212136","title":"Identification of functional TF-miRNA-hub gene regulatory network associated with ovarian endometriosis.","date":"2022","source":"Frontiers in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/36212136","citation_count":8,"is_preprint":false},{"pmid":"34185646","id":"PMC_34185646","title":"An Ensemble Tf-Idf Based Approach to Protein Function Prediction via Sequence Segmentation.","date":"2022","source":"IEEE/ACM transactions on computational biology and bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/34185646","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":49427,"output_tokens":811,"usd":0.080223,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":6714,"output_tokens":886,"usd":0.02786,"stage2_stop_reason":"end_turn"},"total_usd":0.108083,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify which papers are about the canonical human TF (Transferrin) gene with aliases PRO1557/PRO2086. Transferrin (TF) is the iron-transport glycoprotein.\n\nHowever, scanning the abstracts, I see the corpus is heavily mixed:\n- Papers about COUP-TF (a transcription factor family - NR2F1/NR2F2)\n- Papers about Tissue Factor (F3/coagulation factor III, not TF gene)\n- Papers about alphavirus TF protein (transframe protein)\n- Papers about TF as generic abbreviation for \"transcription factor\"\n- Papers about Thomsen-Friedenreich antigen\n- Papers about transferrin (TF gene, the iron transport protein)\n\nThe query gene is TF (Transferrin, HGNC aliases PRO1557, PRO2086). Let me identify papers specifically about human Transferrin protein:\n\n- PMID 23968943: Meta-analysis on TF gene rs1049296 and AD - this is about transferrin gene polymorphism, but it's a genetic association study, not mechanistic\n- PMID 33850216: TF rs3811647 associated with transferrin levels - GWAS/association, not mechanistic\n- PMID 14649881: Tf-CRM107 - uses transferrin as a ligand targeting diphtheria toxin to transferrin receptor. This describes transferrin's binding to its receptor functionally.\n\nMost papers are not about the canonical transferrin protein mechanistically. PMID 14649881 describes cytotoxicity via transferrin receptor binding. PMID 30093019 (not present). Very few papers actually establish mechanistic findings about transferrin protein itself.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"Human transferrin (Tf) binds the transferrin receptor expressed on mammalian cells and mediates internalization; a conjugate of Tf linked to a mutant diphtheria toxin (CRM107) via a thioester bond exhibited potent cytotoxicity at picomolar concentrations against cells expressing the transferrin receptor, demonstrating that Tf-receptor binding is sufficient to deliver a large protein payload intracellularly.\",\n      \"method\": \"In vitro cytotoxicity assay using Tf-CRM107 conjugate on mammalian cells expressing the transferrin receptor; Phase I/II clinical trials confirming receptor-mediated tumor cell killing\",\n      \"journal\": \"Journal of neuro-oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — functional receptor-binding demonstrated via cytotoxicity assay, replicated across preclinical and clinical settings, but mechanistic detail relies on ligand-receptor targeting rather than direct structural or biochemical reconstitution of Tf function\",\n      \"pmids\": [\"14649881\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Transferrin (TF) functions as a serum iron-transport glycoprotein that binds and delivers iron to cells via the transferrin receptor; the available corpus provides limited direct mechanistic experimentation on TF itself, with the strongest functional evidence coming from its use as a receptor-targeting ligand (via Tf-CRM107 conjugates) demonstrating that Tf-transferrin receptor binding mediates efficient endocytic delivery of cargo into receptor-expressing cells.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Transferrin (TF) binds the transferrin receptor on mammalian cells and mediates receptor-dependent internalization, a property demonstrated functionally by conjugating Tf to a mutant diphtheria toxin (CRM107): the Tf-CRM107 conjugate was cytotoxic at picomolar concentrations against transferrin-receptor-expressing cells, establishing that Tf-receptor binding alone is sufficient to deliver a large protein payload into the cell interior via endocytosis [#0]. Beyond this ligand-receptor binding and endocytic delivery activity [#0], no further mechanistic detail of TF itself has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established that Tf binding to the transferrin receptor is sufficient to drive efficient endocytic internalization of a bound macromolecular cargo, validating the receptor-ligand axis as a delivery route.\",\n      \"evidence\": \"In vitro cytotoxicity assay with a Tf-CRM107 (mutant diphtheria toxin) conjugate on receptor-expressing mammalian cells, with confirmation in Phase I/II clinical settings\",\n      \"pmids\": [\"14649881\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanism inferred from a targeting conjugate rather than direct structural or biochemical reconstitution of native Tf function\",\n        \"Iron-binding and iron-delivery activity of TF not directly assayed in this corpus\",\n        \"Receptor-binding interface and endocytic trafficking steps not resolved structurally\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TF binds, sequesters, and releases iron, and the structural basis of its interaction with the transferrin receptor, remain uncharacterized in the available corpus.\",\n      \"evidence\": \"No direct experimental evidence in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct biochemical demonstration of iron binding or release by TF\",\n        \"No structural model of the TF-receptor complex in this corpus\",\n        \"Endosomal pH-dependent iron unloading mechanism not addressed\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":1,"faith_total":1,"faith_pct":100.0}}