{"gene":"VCF1","run_date":"2026-04-28T23:00:23","timeline":{"discoveries":[{"year":2023,"finding":"VCF1 (FAM104A) and VCF2 (FAM104B) directly bind p97/VCP via a novel alpha-helical motif, associate with p97-UFD1-NPL4 and p97-UBXN2B complexes in cells, localize to the nucleus, and promote nuclear import of p97; loss of VCF1/2 reduces nuclear p97 levels, causes slow growth, and confers hypersensitivity to p97 inhibition with or without DNA damage.","method":"Direct binding assays, co-immunoprecipitation of endogenous complexes, subcellular fractionation/imaging, loss-of-function studies with growth and drug-sensitivity phenotypic readouts","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, direct binding, localization with functional consequence, KO phenotype; replicated by independent lab","pmids":["37713320"],"is_preprint":false},{"year":2024,"finding":"VCF1 binds the p97 N-domain via a conserved alpha-helical motif with unusually high affinity (exceeding other cofactors), forms a joint complex with UFD1-NPL4 on p97, and indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates (without intrinsic ubiquitin affinity itself), thereby promoting p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates.","method":"Structure-function studies (NMR/biophysical binding assays with mutagenesis), co-immunoprecipitation, in-cell ubiquitylated substrate degradation assays, affinity measurements","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 — detailed structure-function with affinity measurements, mutagenesis, and cell-based substrate degradation assays in a single study with multiple orthogonal methods","pmids":["38503733"],"is_preprint":false}],"current_model":"VCF1 (FAM104A) is a conserved p97/VCP nuclear cofactor that binds the p97 N-domain with high affinity via a novel alpha-helical motif, promotes p97 nuclear import, and, in complex with UFD1-NPL4, indirectly stimulates recruitment of p97 to ubiquitylated substrates to facilitate their proteasomal degradation."},"narrative":{"teleology":[{"year":2023,"claim":"Establishing VCF1 as a direct p97 cofactor resolved what had been an uncharacterized gene (FAM104A) into a nuclear-localized p97 adaptor that promotes p97 nuclear import and is functionally required for normal growth and resistance to p97 inhibition.","evidence":"Direct binding assays, reciprocal co-immunoprecipitation of endogenous complexes, subcellular fractionation/imaging, and loss-of-function growth/drug-sensitivity phenotyping in human cells","pmids":["37713320"],"confidence":"High","gaps":["The structural basis of the VCF1–p97 interaction was not resolved at atomic resolution","Whether VCF1 affects p97 substrate processing beyond facilitating nuclear import was unknown","Relative affinity of VCF1 for p97 compared with other cofactors was not determined"]},{"year":2024,"claim":"Structure-function dissection revealed that VCF1 binds p97 with affinity exceeding other known cofactors and indirectly stimulates UFD1-NPL4 engagement with ubiquitin conjugates, establishing VCF1 as an allosteric enhancer of p97-dependent substrate degradation rather than a direct ubiquitin receptor.","evidence":"NMR-based structural characterization, quantitative biophysical affinity measurements, mutagenesis of the alpha-helical binding motif, and in-cell ubiquitylated substrate degradation assays","pmids":["38503733"],"confidence":"High","gaps":["The atomic-resolution structure of the full VCF1–p97–UFD1-NPL4 complex has not been determined","Specific endogenous nuclear substrates whose turnover depends on VCF1 remain unidentified","The mechanism by which VCF1 allosterically stimulates UFD1-NPL4 ubiquitin-conjugate recognition is unclear"]},{"year":null,"claim":"It remains unknown which specific nuclear pathways (e.g., chromatin-associated degradation, DNA repair) depend on VCF1-mediated p97 recruitment, and whether VCF1 and its paralog VCF2 have redundant or distinct substrate-specific roles in vivo.","evidence":"","pmids":[],"confidence":"High","gaps":["No in vivo model (animal knockout) has been reported","Functional redundancy between VCF1 and VCF2 has not been systematically dissected","Disease relevance of VCF1 loss-of-function remains unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[1]}],"complexes":["p97-UFD1-NPL4"],"partners":["VCP","UFD1","NPL4","UBXN2B","VCF2"],"other_free_text":[]},"mechanistic_narrative":"VCF1 (FAM104A) is a nuclear cofactor of the AAA-ATPase p97/VCP that binds the p97 N-domain with unusually high affinity via a conserved alpha-helical motif, promoting p97 nuclear import; loss of VCF1 reduces nuclear p97 levels, impairs cell growth, and confers hypersensitivity to p97 inhibition [PMID:37713320]. VCF1 forms a joint complex with p97 and UFD1-NPL4, where it indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates—without possessing intrinsic ubiquitin-binding activity itself—thereby facilitating p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates [PMID:38503733]."},"prefetch_data":{"uniprot":{"accession":"Q969W3","full_name":"Protein VCF1","aliases":["VCP nuclear cofactor family member 1"],"length_aa":186,"mass_kda":19.5,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q969W3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/VCF1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/VCF1","total_profiled":1310},"omim":[{"mim_id":"621109","title":"VCP NUCLEAR COFACTOR FAMILY, MEMBER 1; VCF1","url":"https://www.omim.org/entry/621109"},{"mim_id":"601023","title":"VALOSIN-CONTAINING PROTEIN; VCP","url":"https://www.omim.org/entry/601023"},{"mim_id":"301141","title":"VCP NUCLEAR COFACTOR FAMILY, MEMBER 2; VCF2","url":"https://www.omim.org/entry/301141"}],"hpa":{"profiled":true,"resolved_as":"FAM104A","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":92.9}],"url":"https://www.proteinatlas.org/search/FAM104A"},"hgnc":{"alias_symbol":["FLJ14775"],"prev_symbol":["FAM104A"]},"alphafold":{"accession":"Q969W3","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q969W3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q969W3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q969W3-F1-predicted_aligned_error_v6.png","plddt_mean":61.78},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=VCF1","jax_strain_url":"https://www.jax.org/strain/search?query=VCF1"},"sequence":{"accession":"Q969W3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q969W3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q969W3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q969W3"}},"corpus_meta":[{"pmid":"37713320","id":"PMC_37713320","title":"The FAM104 proteins VCF1/2 promote the nuclear localization of p97/VCP.","date":"2023","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/37713320","citation_count":6,"is_preprint":false},{"pmid":"38503733","id":"PMC_38503733","title":"VCF1 is a p97/VCP cofactor promoting recognition of ubiquitylated p97-UFD1-NPL4 substrates.","date":"2024","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/38503733","citation_count":6,"is_preprint":false},{"pmid":"38224029","id":"PMC_38224029","title":"Identification of Renal Transplantation Rejection Biomarkers in Blood Using the Systems Biology Approach.","date":"2023","source":"Iranian biomedical journal","url":"https://pubmed.ncbi.nlm.nih.gov/38224029","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":2915,"output_tokens":678,"usd":0.009458},"stage2":{"model":"claude-opus-4-6","input_tokens":3843,"output_tokens":2420,"usd":0.119572},"total_usd":0.12903,"stage1_batch_id":"msgbatch_01BparvgRZ9S2LMidvaoo86K","stage2_batch_id":"msgbatch_01NkBfv9SVZWthhS7j6mU6G3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"VCF1 (FAM104A) and VCF2 (FAM104B) directly bind p97/VCP via a novel alpha-helical motif, associate with p97-UFD1-NPL4 and p97-UBXN2B complexes in cells, localize to the nucleus, and promote nuclear import of p97; loss of VCF1/2 reduces nuclear p97 levels, causes slow growth, and confers hypersensitivity to p97 inhibition with or without DNA damage.\",\n      \"method\": \"Direct binding assays, co-immunoprecipitation of endogenous complexes, subcellular fractionation/imaging, loss-of-function studies with growth and drug-sensitivity phenotypic readouts\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, direct binding, localization with functional consequence, KO phenotype; replicated by independent lab\",\n      \"pmids\": [\"37713320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"VCF1 binds the p97 N-domain via a conserved alpha-helical motif with unusually high affinity (exceeding other cofactors), forms a joint complex with UFD1-NPL4 on p97, and indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates (without intrinsic ubiquitin affinity itself), thereby promoting p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates.\",\n      \"method\": \"Structure-function studies (NMR/biophysical binding assays with mutagenesis), co-immunoprecipitation, in-cell ubiquitylated substrate degradation assays, affinity measurements\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — detailed structure-function with affinity measurements, mutagenesis, and cell-based substrate degradation assays in a single study with multiple orthogonal methods\",\n      \"pmids\": [\"38503733\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"VCF1 (FAM104A) is a conserved p97/VCP nuclear cofactor that binds the p97 N-domain with high affinity via a novel alpha-helical motif, promotes p97 nuclear import, and, in complex with UFD1-NPL4, indirectly stimulates recruitment of p97 to ubiquitylated substrates to facilitate their proteasomal degradation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"VCF1 (FAM104A) is a nuclear cofactor of the AAA-ATPase p97/VCP that binds the p97 N-domain with unusually high affinity via a conserved alpha-helical motif, promoting p97 nuclear import; loss of VCF1 reduces nuclear p97 levels, impairs cell growth, and confers hypersensitivity to p97 inhibition [PMID:37713320]. VCF1 forms a joint complex with p97 and UFD1-NPL4, where it indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates—without possessing intrinsic ubiquitin-binding activity itself—thereby facilitating p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates [PMID:38503733].\",\n  \"teleology\": [\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing VCF1 as a direct p97 cofactor resolved what had been an uncharacterized gene (FAM104A) into a nuclear-localized p97 adaptor that promotes p97 nuclear import and is functionally required for normal growth and resistance to p97 inhibition.\",\n      \"evidence\": \"Direct binding assays, reciprocal co-immunoprecipitation of endogenous complexes, subcellular fractionation/imaging, and loss-of-function growth/drug-sensitivity phenotyping in human cells\",\n      \"pmids\": [\"37713320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The structural basis of the VCF1–p97 interaction was not resolved at atomic resolution\",\n        \"Whether VCF1 affects p97 substrate processing beyond facilitating nuclear import was unknown\",\n        \"Relative affinity of VCF1 for p97 compared with other cofactors was not determined\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Structure-function dissection revealed that VCF1 binds p97 with affinity exceeding other known cofactors and indirectly stimulates UFD1-NPL4 engagement with ubiquitin conjugates, establishing VCF1 as an allosteric enhancer of p97-dependent substrate degradation rather than a direct ubiquitin receptor.\",\n      \"evidence\": \"NMR-based structural characterization, quantitative biophysical affinity measurements, mutagenesis of the alpha-helical binding motif, and in-cell ubiquitylated substrate degradation assays\",\n      \"pmids\": [\"38503733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The atomic-resolution structure of the full VCF1–p97–UFD1-NPL4 complex has not been determined\",\n        \"Specific endogenous nuclear substrates whose turnover depends on VCF1 remain unidentified\",\n        \"The mechanism by which VCF1 allosterically stimulates UFD1-NPL4 ubiquitin-conjugate recognition is unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown which specific nuclear pathways (e.g., chromatin-associated degradation, DNA repair) depend on VCF1-mediated p97 recruitment, and whether VCF1 and its paralog VCF2 have redundant or distinct substrate-specific roles in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No in vivo model (animal knockout) has been reported\",\n        \"Functional redundancy between VCF1 and VCF2 has not been systematically dissected\",\n        \"Disease relevance of VCF1 loss-of-function remains unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009609507\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"p97-UFD1-NPL4\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"UFD1\",\n      \"NPL4\",\n      \"UBXN2B\",\n      \"VCF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I need to fix the pathway entry. `GO:0009609507` is not a valid ID — it should be `R-HSA-9609507`. Let me correct:\n\n```json\n{\n  \"mechanistic_narrative\": \"VCF1 (FAM104A) is a nuclear cofactor of the AAA-ATPase p97/VCP that binds the p97 N-domain with unusually high affinity via a conserved alpha-helical motif, promoting p97 nuclear import; loss of VCF1 reduces nuclear p97 levels, impairs cell growth, and confers hypersensitivity to p97 inhibition [PMID:37713320]. VCF1 forms a joint complex with p97 and UFD1-NPL4, where it indirectly stimulates UFD1-NPL4 interactions with ubiquitin conjugates—without possessing intrinsic ubiquitin-binding activity itself—thereby facilitating p97-UFD1-NPL4-dependent proteasomal degradation of ubiquitylated substrates [PMID:38503733].\",\n  \"teleology\": [\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing VCF1 as a direct p97 cofactor resolved what had been an uncharacterized gene (FAM104A) into a nuclear-localized p97 adaptor that promotes p97 nuclear import and is functionally required for normal growth and resistance to p97 inhibition.\",\n      \"evidence\": \"Direct binding assays, reciprocal co-immunoprecipitation of endogenous complexes, subcellular fractionation/imaging, and loss-of-function growth/drug-sensitivity phenotyping in human cells\",\n      \"pmids\": [\"37713320\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The structural basis of the VCF1–p97 interaction was not resolved at atomic resolution\",\n        \"Whether VCF1 affects p97 substrate processing beyond facilitating nuclear import was unknown\",\n        \"Relative affinity of VCF1 for p97 compared with other cofactors was not determined\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Structure-function dissection revealed that VCF1 binds p97 with affinity exceeding other known cofactors and indirectly stimulates UFD1-NPL4 engagement with ubiquitin conjugates, establishing VCF1 as an allosteric enhancer of p97-dependent substrate degradation rather than a direct ubiquitin receptor.\",\n      \"evidence\": \"NMR-based structural characterization, quantitative biophysical affinity measurements, mutagenesis of the alpha-helical binding motif, and in-cell ubiquitylated substrate degradation assays\",\n      \"pmids\": [\"38503733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The atomic-resolution structure of the full VCF1–p97–UFD1-NPL4 complex has not been determined\",\n        \"Specific endogenous nuclear substrates whose turnover depends on VCF1 remain unidentified\",\n        \"The mechanism by which VCF1 allosterically stimulates UFD1-NPL4 ubiquitin-conjugate recognition is unclear\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown which specific nuclear pathways (e.g., chromatin-associated degradation, DNA repair) depend on VCF1-mediated p97 recruitment, and whether VCF1 and its paralog VCF2 have redundant or distinct substrate-specific roles in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No in vivo model (animal knockout) has been reported\",\n        \"Functional redundancy between VCF1 and VCF2 has not been systematically dissected\",\n        \"Disease relevance of VCF1 loss-of-function remains unexplored\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [\n      \"p97-UFD1-NPL4\"\n    ],\n    \"partners\": [\n      \"VCP\",\n      \"UFD1\",\n      \"NPL4\",\n      \"UBXN2B\",\n      \"VCF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}