{"gene":"NUDCD3","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2006,"finding":"NudCL (NUDCD3) binds to the dynein complex and its depletion induces degradation of dynein intermediate chain via the proteasome pathway (suppressed by MG132), suggesting NUDCD3 stabilizes dynein intermediate chain.","method":"Co-immunoprecipitation, RNAi knockdown in HeLa cells, proteasome inhibitor rescue assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional RNAi knockdown with multiple phenotypic readouts and proteasome inhibitor rescue, single lab but orthogonal methods","pmids":["16754861"],"is_preprint":false},{"year":2006,"finding":"Depletion of NudCL (NUDCD3) in HeLa cells causes mitotic arrest with multiple defects including failure to recruit gamma-tubulin to spindle poles and mislocalization of the dynein complex from kinetochores, spindle microtubules, and spindle poles, resulting in cell death.","method":"RNAi knockdown in HeLa cells, immunofluorescence, cell viability assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean RNAi knockdown with multiple defined cellular phenotypes and immunofluorescence localization readouts, single lab","pmids":["16754861"],"is_preprint":false},{"year":2011,"finding":"NudCL (NUDCD3) contains a CS domain characteristic of Hsp90 cochaperones/small heat shock proteins and dimerizes via an N-terminally located coiled coil. NudCL inhibits aggregation of target proteins in an Hsp90-independent manner, demonstrating chaperone activity. However, NudCL does not form a binary complex with Lis1.","method":"Crystallographic structure determination, NMR, in vitro protein aggregation assay","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus NMR plus in vitro chaperone assay, multiple orthogonal methods in one study","pmids":["21530541"],"is_preprint":false},{"year":2013,"finding":"NudCL (NUDCD3) depletion partially reduces retrograde mitochondrial transport in hippocampal neuron axons; combined knockdown of both Ndel1 and NudCL almost completely blocks retrograde mitochondrial transport, indicating they function together to regulate retrograde transport by linking the dynein-LIS1 complex.","method":"RNAi knockdown in cultured hippocampal neurons, live imaging of mitochondrial transport","journal":"Traffic (Copenhagen, Denmark)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — live imaging with RNAi and double-knockdown epistasis in neurons, single lab","pmids":["23551859"],"is_preprint":false},{"year":2014,"finding":"NudCD3 (NUDCD3) associates with cytoplasmic dynein-2 complex as well as dynein-1, as determined by proteomic analysis of the dynein-2 complex.","method":"Co-immunoprecipitation followed by mass spectrometry (proteomic subunit composition analysis)","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry-based interactome from Co-IP, single lab, identifies NUDCD3 as a dynein-2 associated protein","pmids":["25205765"],"is_preprint":false},{"year":2024,"finding":"NUDCD3 is required for RAG-mediated V(D)J recombination; cells from patients with a deleterious NUDCD3 missense variant show diminished ability to support RAG-mediated recombination in vitro, associated with pathologic sequestration of RAG1 in the nucleoli.","method":"In vitro RAG-mediated recombination assay using patient cells, patient missense variant analysis, immunofluorescence of RAG1 localization","journal":"Science immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro recombination assay with patient cells plus subcellular localization of RAG1, validated in human patients and a mouse model with homologous variant","pmids":["38787962"],"is_preprint":false},{"year":2025,"finding":"NUDCD3 interacts with gigaxonin (KLHL16) specifically via gigaxonin's Kelch 3 (K3) motif; deletion of the K3 motif abolishes the gigaxonin-NUDCD3 interaction as determined by mass spectrometry, and this loss of interaction is associated with abnormal vimentin intermediate filament bundling (GAN-like phenotype).","method":"Mass spectrometry proteomics of gigaxonin deletion mutants in HEK293 cells, AlphaFold structural modeling, IF microscopy of vimentin","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — mass spectrometry interaction mapping with deletion mutants and AlphaFold modeling plus cell biology, two papers from same group reporting consistent findings","pmids":["40749357","40161598"],"is_preprint":false}],"current_model":"NUDCD3 (NudCL) is a CS-domain-containing molecular chaperone that stabilizes dynein intermediate chain (preventing its proteasomal degradation), associates with both cytoplasmic dynein-1 and dynein-2 complexes to support mitotic spindle organization and retrograde axonal mitochondrial transport, acts as a RAG1 co-chaperone required for proper RAG1 nuclear localization and V(D)J recombination in developing lymphocytes, and interacts with the intermediate filament regulator gigaxonin via its Kelch 3 motif to maintain vimentin filament proteostasis."},"narrative":{"mechanistic_narrative":"NUDCD3 (NudCL) is a CS-domain molecular chaperone that supports dynein-dependent cellular processes and protein proteostasis [PMID:16754861, PMID:21530541]. Its CS domain is characteristic of Hsp90 cochaperones/small heat shock proteins, and the protein dimerizes through an N-terminal coiled coil and suppresses aggregation of target proteins in an Hsp90-independent manner, while not forming a binary complex with Lis1 [PMID:21530541]. NUDCD3 binds the cytoplasmic dynein complex and stabilizes the dynein intermediate chain: its depletion triggers proteasomal degradation of the intermediate chain, mitotic arrest, failure to recruit gamma-tubulin to spindle poles, and mislocalization of dynein from kinetochores and spindle poles, leading to cell death [PMID:16754861]. It associates with both dynein-1 and dynein-2 complexes [PMID:25205765] and acts together with Ndel1 to support dynein-LIS1-mediated retrograde mitochondrial transport in neuronal axons [PMID:23551859]. Beyond its dynein role, NUDCD3 functions as a factor required for RAG-mediated V(D)J recombination, with a deleterious patient missense variant causing pathologic sequestration of RAG1 in nucleoli and diminished recombination, establishing a human disease link [PMID:38787962]. NUDCD3 also interacts with gigaxonin (KLHL16) via the Kelch 3 motif, an interaction whose loss is associated with abnormal vimentin intermediate filament bundling [PMID:40749357, PMID:40161598].","teleology":[{"year":2006,"claim":"Established that NUDCD3 physically engages the dynein complex and stabilizes the dynein intermediate chain against proteasomal turnover, defining its first molecular function.","evidence":"Reciprocal Co-IP, RNAi knockdown, and MG132 rescue in HeLa cells","pmids":["16754861"],"confidence":"High","gaps":["Whether stabilization reflects direct chaperone binding to the intermediate chain versus an indirect effect was not resolved","No structural detail of the NUDCD3-dynein interface"]},{"year":2006,"claim":"Linked NUDCD3 loss to mitotic failure, showing its dynein-stabilizing role is required for spindle organization and cell viability.","evidence":"RNAi knockdown, immunofluorescence of spindle/kinetochore markers, and viability assays in HeLa cells","pmids":["16754861"],"confidence":"High","gaps":["Mechanism connecting dynein intermediate chain loss to gamma-tubulin recruitment failure not defined","Mitotic phenotypes assayed in a single cell line"]},{"year":2011,"claim":"Defined NUDCD3 as a CS-domain chaperone with intrinsic anti-aggregation activity, providing a biochemical basis for its stabilizing function and excluding a direct Lis1 binary complex.","evidence":"Crystal structure, NMR, and in vitro protein aggregation assay","pmids":["21530541"],"confidence":"High","gaps":["Physiological substrates of the chaperone activity beyond dynein intermediate chain not enumerated","Relationship between chaperone activity and dynein stabilization in cells not directly tested"]},{"year":2013,"claim":"Extended NUDCD3 function to neuronal cargo transport, showing it acts with Ndel1 to link the dynein-LIS1 complex for retrograde mitochondrial transport.","evidence":"RNAi and double-knockdown epistasis with live imaging of mitochondrial transport in hippocampal neurons","pmids":["23551859"],"confidence":"Medium","gaps":["Partial single-knockdown effect leaves the relative contribution of NUDCD3 unclear","Direct physical link to Ndel1/LIS1 not biochemically mapped"]},{"year":2014,"claim":"Showed NUDCD3 is not restricted to dynein-1 but also associates with the dynein-2 complex, broadening its motor associations.","evidence":"Co-IP/mass spectrometry proteomic analysis of the dynein-2 complex","pmids":["25205765"],"confidence":"Medium","gaps":["Functional role within dynein-2 (e.g., intraflagellar transport) not tested","Single-lab interactome without functional validation"]},{"year":2024,"claim":"Identified a dynein-independent role for NUDCD3 as a factor controlling RAG1 nuclear localization required for V(D)J recombination, and linked a patient variant to immune disease.","evidence":"In vitro RAG-mediated recombination assay with patient cells, missense variant analysis, RAG1 immunofluorescence, and a mouse model","pmids":["38787962"],"confidence":"High","gaps":["Whether the chaperone activity directly handles RAG1 versus an indirect mechanism not resolved","Molecular basis of RAG1 nucleolar sequestration not defined"]},{"year":2025,"claim":"Mapped a NUDCD3-gigaxonin interaction to the Kelch 3 motif, connecting NUDCD3 to intermediate filament proteostasis.","evidence":"Mass spectrometry of gigaxonin deletion mutants, AlphaFold modeling, and vimentin immunofluorescence in HEK293 cells","pmids":["40749357","40161598"],"confidence":"Medium","gaps":["Direct functional consequence of NUDCD3 loss on vimentin bundling not isolated","Interaction inferred from deletion mapping and modeling rather than reconstitution"]},{"year":null,"claim":"How NUDCD3's single CS-domain chaperone activity is partitioned among its diverse clients (dynein intermediate chain, RAG1, gigaxonin) remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking chaperone biochemistry to client selection","No structure of NUDCD3 bound to any client"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[0,2]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[1]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5]}],"complexes":["cytoplasmic dynein-1 complex","cytoplasmic dynein-2 complex"],"partners":["DYNC1I1","NDEL1","RAG1","KLHL16"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8IVD9","full_name":"NudC domain-containing protein 3","aliases":[],"length_aa":361,"mass_kda":40.8,"function":"","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q8IVD9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NUDCD3","classification":"Common Essential","n_dependent_lines":807,"n_total_lines":1208,"dependency_fraction":0.668046357615894},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"FKBP5","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NUDCD3","total_profiled":1310},"omim":[{"mim_id":"620136","title":"NUDC DOMAIN-CONTAINING PROTEIN 2; NUDCD2","url":"https://www.omim.org/entry/620136"},{"mim_id":"610296","title":"NUDC DOMAIN-CONTAINING PROTEIN 3; NUDCD3","url":"https://www.omim.org/entry/610296"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Primary cilium tip","reliability":"Additional"},{"location":"Principal piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NUDCD3"},"hgnc":{"alias_symbol":["KIAA1068","NudCL"],"prev_symbol":[]},"alphafold":{"accession":"Q8IVD9","domains":[{"cath_id":"-","chopping":"4-86","consensus_level":"medium","plddt":89.0525,"start":4,"end":86},{"cath_id":"2.60.40.790","chopping":"178-267","consensus_level":"high","plddt":94.5933,"start":178,"end":267},{"cath_id":"-","chopping":"300-352","consensus_level":"high","plddt":88.607,"start":300,"end":352}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IVD9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IVD9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8IVD9-F1-predicted_aligned_error_v6.png","plddt_mean":79.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NUDCD3","jax_strain_url":"https://www.jax.org/strain/search?query=NUDCD3"},"sequence":{"accession":"Q8IVD9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8IVD9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8IVD9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8IVD9"}},"corpus_meta":[{"pmid":"25205765","id":"PMC_25205765","title":"Subunit composition of the human cytoplasmic dynein-2 complex.","date":"2014","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/25205765","citation_count":83,"is_preprint":false},{"pmid":"16754861","id":"PMC_16754861","title":"A mammalian NudC-like protein essential for dynein stability and cell viability.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16754861","citation_count":47,"is_preprint":false},{"pmid":"23551859","id":"PMC_23551859","title":"Distinct functions of nuclear distribution proteins LIS1, Ndel1 and NudCL in regulating axonal mitochondrial transport.","date":"2013","source":"Traffic (Copenhagen, Denmark)","url":"https://pubmed.ncbi.nlm.nih.gov/23551859","citation_count":38,"is_preprint":false},{"pmid":"26965524","id":"PMC_26965524","title":"Emerging roles of NudC family: from molecular regulation to clinical implications.","date":"2016","source":"Science China. Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/26965524","citation_count":32,"is_preprint":false},{"pmid":"21530541","id":"PMC_21530541","title":"Structural features and chaperone activity of the NudC protein family.","date":"2011","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/21530541","citation_count":30,"is_preprint":false},{"pmid":"36624188","id":"PMC_36624188","title":"Uterine inflammatory myofibroblastic tumor harboring novel NUDCD3-ROS1 and NRP2-ALK fusions: clinicopathologic features of 4 cases and literature review.","date":"2023","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/36624188","citation_count":11,"is_preprint":false},{"pmid":"38787962","id":"PMC_38787962","title":"NUDCD3 deficiency disrupts V(D)J recombination to cause SCID and Omenn syndrome.","date":"2024","source":"Science immunology","url":"https://pubmed.ncbi.nlm.nih.gov/38787962","citation_count":4,"is_preprint":false},{"pmid":"40161598","id":"PMC_40161598","title":"The Kelch 3 motif on gigaxonin mediates the interaction with NUDCD3 and regulates vimentin filament morphology.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40161598","citation_count":1,"is_preprint":false},{"pmid":"40749357","id":"PMC_40749357","title":"The Kelch 3 motif on gigaxonin mediates the interaction with NUDCD3 and regulates vimentin filament morphology.","date":"2025","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/40749357","citation_count":0,"is_preprint":false},{"pmid":"41902554","id":"PMC_41902554","title":"An update on inborn errors of V(D)J recombination.","date":"2026","source":"Physiology (Bethesda, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/41902554","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7236,"output_tokens":1702,"usd":0.023619,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8538,"output_tokens":2611,"usd":0.053983,"stage2_stop_reason":"end_turn"},"total_usd":0.077602,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2006,\n      \"finding\": \"NudCL (NUDCD3) binds to the dynein complex and its depletion induces degradation of dynein intermediate chain via the proteasome pathway (suppressed by MG132), suggesting NUDCD3 stabilizes dynein intermediate chain.\",\n      \"method\": \"Co-immunoprecipitation, RNAi knockdown in HeLa cells, proteasome inhibitor rescue assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional RNAi knockdown with multiple phenotypic readouts and proteasome inhibitor rescue, single lab but orthogonal methods\",\n      \"pmids\": [\"16754861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Depletion of NudCL (NUDCD3) in HeLa cells causes mitotic arrest with multiple defects including failure to recruit gamma-tubulin to spindle poles and mislocalization of the dynein complex from kinetochores, spindle microtubules, and spindle poles, resulting in cell death.\",\n      \"method\": \"RNAi knockdown in HeLa cells, immunofluorescence, cell viability assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean RNAi knockdown with multiple defined cellular phenotypes and immunofluorescence localization readouts, single lab\",\n      \"pmids\": [\"16754861\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NudCL (NUDCD3) contains a CS domain characteristic of Hsp90 cochaperones/small heat shock proteins and dimerizes via an N-terminally located coiled coil. NudCL inhibits aggregation of target proteins in an Hsp90-independent manner, demonstrating chaperone activity. However, NudCL does not form a binary complex with Lis1.\",\n      \"method\": \"Crystallographic structure determination, NMR, in vitro protein aggregation assay\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus NMR plus in vitro chaperone assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21530541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NudCL (NUDCD3) depletion partially reduces retrograde mitochondrial transport in hippocampal neuron axons; combined knockdown of both Ndel1 and NudCL almost completely blocks retrograde mitochondrial transport, indicating they function together to regulate retrograde transport by linking the dynein-LIS1 complex.\",\n      \"method\": \"RNAi knockdown in cultured hippocampal neurons, live imaging of mitochondrial transport\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with RNAi and double-knockdown epistasis in neurons, single lab\",\n      \"pmids\": [\"23551859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NudCD3 (NUDCD3) associates with cytoplasmic dynein-2 complex as well as dynein-1, as determined by proteomic analysis of the dynein-2 complex.\",\n      \"method\": \"Co-immunoprecipitation followed by mass spectrometry (proteomic subunit composition analysis)\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry-based interactome from Co-IP, single lab, identifies NUDCD3 as a dynein-2 associated protein\",\n      \"pmids\": [\"25205765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NUDCD3 is required for RAG-mediated V(D)J recombination; cells from patients with a deleterious NUDCD3 missense variant show diminished ability to support RAG-mediated recombination in vitro, associated with pathologic sequestration of RAG1 in the nucleoli.\",\n      \"method\": \"In vitro RAG-mediated recombination assay using patient cells, patient missense variant analysis, immunofluorescence of RAG1 localization\",\n      \"journal\": \"Science immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro recombination assay with patient cells plus subcellular localization of RAG1, validated in human patients and a mouse model with homologous variant\",\n      \"pmids\": [\"38787962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NUDCD3 interacts with gigaxonin (KLHL16) specifically via gigaxonin's Kelch 3 (K3) motif; deletion of the K3 motif abolishes the gigaxonin-NUDCD3 interaction as determined by mass spectrometry, and this loss of interaction is associated with abnormal vimentin intermediate filament bundling (GAN-like phenotype).\",\n      \"method\": \"Mass spectrometry proteomics of gigaxonin deletion mutants in HEK293 cells, AlphaFold structural modeling, IF microscopy of vimentin\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — mass spectrometry interaction mapping with deletion mutants and AlphaFold modeling plus cell biology, two papers from same group reporting consistent findings\",\n      \"pmids\": [\"40749357\", \"40161598\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NUDCD3 (NudCL) is a CS-domain-containing molecular chaperone that stabilizes dynein intermediate chain (preventing its proteasomal degradation), associates with both cytoplasmic dynein-1 and dynein-2 complexes to support mitotic spindle organization and retrograde axonal mitochondrial transport, acts as a RAG1 co-chaperone required for proper RAG1 nuclear localization and V(D)J recombination in developing lymphocytes, and interacts with the intermediate filament regulator gigaxonin via its Kelch 3 motif to maintain vimentin filament proteostasis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NUDCD3 (NudCL) is a CS-domain molecular chaperone that supports dynein-dependent cellular processes and protein proteostasis [#0, #2]. Its CS domain is characteristic of Hsp90 cochaperones/small heat shock proteins, and the protein dimerizes through an N-terminal coiled coil and suppresses aggregation of target proteins in an Hsp90-independent manner, while not forming a binary complex with Lis1 [#2]. NUDCD3 binds the cytoplasmic dynein complex and stabilizes the dynein intermediate chain: its depletion triggers proteasomal degradation of the intermediate chain, mitotic arrest, failure to recruit gamma-tubulin to spindle poles, and mislocalization of dynein from kinetochores and spindle poles, leading to cell death [#0, #1]. It associates with both dynein-1 and dynein-2 complexes [#4] and acts together with Ndel1 to support dynein-LIS1-mediated retrograde mitochondrial transport in neuronal axons [#3]. Beyond its dynein role, NUDCD3 functions as a factor required for RAG-mediated V(D)J recombination, with a deleterious patient missense variant causing pathologic sequestration of RAG1 in nucleoli and diminished recombination, establishing a human disease link [#5]. NUDCD3 also interacts with gigaxonin (KLHL16) via the Kelch 3 motif, an interaction whose loss is associated with abnormal vimentin intermediate filament bundling [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established that NUDCD3 physically engages the dynein complex and stabilizes the dynein intermediate chain against proteasomal turnover, defining its first molecular function.\",\n      \"evidence\": \"Reciprocal Co-IP, RNAi knockdown, and MG132 rescue in HeLa cells\",\n      \"pmids\": [\"16754861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether stabilization reflects direct chaperone binding to the intermediate chain versus an indirect effect was not resolved\", \"No structural detail of the NUDCD3-dynein interface\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Linked NUDCD3 loss to mitotic failure, showing its dynein-stabilizing role is required for spindle organization and cell viability.\",\n      \"evidence\": \"RNAi knockdown, immunofluorescence of spindle/kinetochore markers, and viability assays in HeLa cells\",\n      \"pmids\": [\"16754861\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting dynein intermediate chain loss to gamma-tubulin recruitment failure not defined\", \"Mitotic phenotypes assayed in a single cell line\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Defined NUDCD3 as a CS-domain chaperone with intrinsic anti-aggregation activity, providing a biochemical basis for its stabilizing function and excluding a direct Lis1 binary complex.\",\n      \"evidence\": \"Crystal structure, NMR, and in vitro protein aggregation assay\",\n      \"pmids\": [\"21530541\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates of the chaperone activity beyond dynein intermediate chain not enumerated\", \"Relationship between chaperone activity and dynein stabilization in cells not directly tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended NUDCD3 function to neuronal cargo transport, showing it acts with Ndel1 to link the dynein-LIS1 complex for retrograde mitochondrial transport.\",\n      \"evidence\": \"RNAi and double-knockdown epistasis with live imaging of mitochondrial transport in hippocampal neurons\",\n      \"pmids\": [\"23551859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Partial single-knockdown effect leaves the relative contribution of NUDCD3 unclear\", \"Direct physical link to Ndel1/LIS1 not biochemically mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed NUDCD3 is not restricted to dynein-1 but also associates with the dynein-2 complex, broadening its motor associations.\",\n      \"evidence\": \"Co-IP/mass spectrometry proteomic analysis of the dynein-2 complex\",\n      \"pmids\": [\"25205765\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role within dynein-2 (e.g., intraflagellar transport) not tested\", \"Single-lab interactome without functional validation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a dynein-independent role for NUDCD3 as a factor controlling RAG1 nuclear localization required for V(D)J recombination, and linked a patient variant to immune disease.\",\n      \"evidence\": \"In vitro RAG-mediated recombination assay with patient cells, missense variant analysis, RAG1 immunofluorescence, and a mouse model\",\n      \"pmids\": [\"38787962\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the chaperone activity directly handles RAG1 versus an indirect mechanism not resolved\", \"Molecular basis of RAG1 nucleolar sequestration not defined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mapped a NUDCD3-gigaxonin interaction to the Kelch 3 motif, connecting NUDCD3 to intermediate filament proteostasis.\",\n      \"evidence\": \"Mass spectrometry of gigaxonin deletion mutants, AlphaFold modeling, and vimentin immunofluorescence in HEK293 cells\",\n      \"pmids\": [\"40749357\", \"40161598\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct functional consequence of NUDCD3 loss on vimentin bundling not isolated\", \"Interaction inferred from deletion mapping and modeling rather than reconstitution\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NUDCD3's single CS-domain chaperone activity is partitioned among its diverse clients (dynein intermediate chain, RAG1, gigaxonin) remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking chaperone biochemistry to client selection\", \"No structure of NUDCD3 bound to any client\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\"cytoplasmic dynein-1 complex\", \"cytoplasmic dynein-2 complex\"],\n    \"partners\": [\"DYNC1I1\", \"Ndel1\", \"RAG1\", \"KLHL16\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":6,"faith_total":6,"faith_pct":100.0}}