{"gene":"KIFAP3","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1996,"finding":"KAP3 (KIFAP3) was purified from mouse testis and shown to be a non-motor accessory subunit that binds to the tail domain of the KIF3A/KIF3B heterodimeric kinesin motor complex without affecting its ATPase/motor activity; two isoforms (KAP3A and KAP3B) are generated by alternative splicing in the C-terminal region.","method":"Immunoprecipitation with anti-KIF3B antibody, microsequencing, cDNA cloning, baculovirus/Sf9 reconstitution, immunolocalization","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in Sf9 cells plus biochemical pulldown and motor activity assay; original discovery paper","pmids":["8710890"],"is_preprint":false},{"year":1998,"finding":"SMAP/KAP3 (KIFAP3) was identified as a human counterpart of mouse KAP3; it forms a ternary complex with HCAP (a condensin subunit) and KIF3B extractable from the nuclear fraction in the presence of Mg-ATP, suggesting KAP3 links chromosomal proteins to the KIF3 motor in the nucleus.","method":"Yeast two-hybrid screen, co-immunoprecipitation, subcellular fractionation, Western blotting","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP and fractionation from nuclear extract, single lab","pmids":["9506951"],"is_preprint":false},{"year":1996,"finding":"SMAP/KAP3 (KIFAP3) contains nine Armadillo repeats, interacts with SmgGDS (a small-GTPase GDP/GTP exchange factor), and is a substrate for Src tyrosine kinase phosphorylation; phosphorylation by Src reduces the affinity of KAP3 for SmgGDS.","method":"Yeast two-hybrid isolation, recombinant protein binding assay, in vitro Src kinase assay, subcellular fractionation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro kinase assay plus binding assay with purified proteins, single lab","pmids":["8900189"],"is_preprint":false},{"year":2004,"finding":"In Chlamydomonas, the KAP (KAP3 ortholog) subunit of kinesin-2 is required for targeting/retaining the kinesin-2 complex at the basal body region and for efficient anterograde intraflagellar transport (IFT); a point mutation in the conserved C-terminal domain of KAP causes reduced frequency of anterograde IFT particles and flagellar loss at restrictive temperature.","method":"Temperature-sensitive mutant analysis, video-enhanced DIC microscopy of IFT, epitope-tagged rescue transformation, immunolocalization","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with specific cellular phenotype (IFT frequency/localization) plus transgenic rescue, multiple orthogonal methods","pmids":["15616187"],"is_preprint":false},{"year":2008,"finding":"Misfolded mutant SOD1 specifically associates with KAP3 (KIFAP3) in motor axons of SOD1(G93A) mice from pre-onset stage, sequestering KAP3 from the kinesin-2 complex and thereby impairing axonal transport of its cargo choline acetyltransferase (ChAT); KAP3 overexpression normalized impaired acetylcholine release in a cell model.","method":"Co-immunoprecipitation from spinal cord, immunohistochemistry, ChAT transport assay, KAP3 overexpression rescue in NG108-15 cells, human FALS tissue immunostaining","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (Co-IP, transport assay, rescue experiment, human tissue validation), replicated in mouse model and human cases","pmids":["19088126"],"is_preprint":false},{"year":2022,"finding":"Loss of KAP3 (KIFAP3) in gastric signet-ring cell carcinoma cells impairs post-Golgi transport of laminin (disrupting basement membrane formation) and inactivates RhoA, thereby disrupting circumferential actomyosin cables and weakening cell–cell adhesion.","method":"CRISPR/Cas9 knockout, immunofluorescence, RhoA activity assay, basement membrane formation assay","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular phenotypes (adhesion, actomyosin, laminin transport), multiple orthogonal readouts, single lab","pmids":["35322078"],"is_preprint":false},{"year":2007,"finding":"Aroclor 1254 exposure significantly reduces KAP3 mRNA levels in hypothalamic tissue during critical periods of brain sexual differentiation and puberty in rat, correlating with impaired reproductive function, establishing KAP3 transcription as sensitive to endocrine disruption during neurogenesis.","method":"Northern blot hybridization in vivo, reproductive endpoint measurement","journal":"Reproduction, fertility, and development","confidence":"Low","confidence_rationale":"Tier 3 — in vivo expression change without direct mechanistic rescue; correlative but in vivo","pmids":["17524298"],"is_preprint":false},{"year":2000,"finding":"C. elegans KAP-1 (ortholog of KIFAP3/KAP3) contains an Armadillo consensus motif conserved from sea urchin KAP115 and is predicted to form a heterotrimeric complex with KLP-11 and OSM-3 kinesins, consistent with its role as the non-motor adaptor subunit of kinesin-2.","method":"cDNA sequencing, sequence homology analysis, structural prediction","journal":"DNA research","confidence":"Low","confidence_rationale":"Tier 4 — computational/sequence-based prediction only, no functional experiment","pmids":["10819327"],"is_preprint":false},{"year":2026,"finding":"Biochemical and cellular analyses revealed a KIF3B-enriched, KAP3-associated kinesin-2 assembly (distinct from the canonical KIF3A/B/KAP3 heterotrimer) that preferentially associates with TRIM46 and facilitates its transport to the axon initial segment; structural analyses suggest differences in tail conformation accompany distinct assembly states and may underlie cargo selectivity.","method":"Co-immunoprecipitation, cellular fractionation, live-cell imaging, structural analysis","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal Co-IP plus cellular and structural analyses, single lab, peer-reviewed","pmids":["41910726"],"is_preprint":false},{"year":2025,"finding":"Cryo-EM structures of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) bound to APC cargo revealed a previously uncharacterized 'Hitchdock domain' in KIF3 tails that mediates interactions with both the KAP3 adaptor subunit and the APC cargo; mutagenesis and molecular dynamics confirmed this domain's functional importance for cargo binding.","method":"Cryo-electron microscopy, mutagenesis, molecular dynamics simulations, cargo-binding assays","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — high-resolution cryo-EM structure with mutagenesis and MD validation; multiple orthogonal methods in single study","pmids":[],"is_preprint":true},{"year":2024,"finding":"Structural and single-molecule analyses of the kinesin-2 heterotrimer revealed a conserved beta-hairpin motif in KIF3 tails that autoinhibits motility by sequestering motor domains away from microtubules; KAP3 (Kap3) binding creates a platform on which cargo adaptors engage and occlude the beta-hairpin motif, thereby activating motility.","method":"Cryo-EM/structural analysis, single-molecule motility assays, cell biological assays, mutagenesis","journal":"bioRxiv","confidence":"High","confidence_rationale":"Tier 1 — structural, single-molecule, and cell biological approaches combined in one study; defines KAP3 role in activation mechanism","pmids":[],"is_preprint":true}],"current_model":"KIFAP3 (KAP3) is the non-motor accessory/adaptor subunit of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) that binds via a multipartite interface to the KIF3 tail 'Hitchdock domain'; it does not affect intrinsic motor ATPase activity but is essential for targeting kinesin-2 to the site of flagellar/cilia assembly, enabling processive anterograde intraflagellar transport, and for recruiting cargoes (including APC and TRIM46) by providing a platform that occludes the autoinhibitory beta-hairpin motif of the KIF3 tails; in neurons KAP3 mediates axonal transport of choline acetyltransferase and other cargoes, and sequestration of KAP3 by misfolded SOD1 impairs this transport in ALS models."},"narrative":{"teleology":[{"year":1996,"claim":"Identifying KAP3 as a non-motor subunit of kinesin-2 established that this motor operates as a heterotrimer rather than a simple heterodimer, and that KAP3 associates with the motor tail without altering its enzymatic activity.","evidence":"Immunoprecipitation, microsequencing, baculovirus/Sf9 reconstitution, and motor ATPase assays from mouse testis","pmids":["8710890"],"confidence":"High","gaps":["Cargo identity unknown at this stage","No structural information on the KAP3–tail interface","Cellular function of the two splice isoforms (KAP3A/B) unresolved"]},{"year":1996,"claim":"Discovery of nine Armadillo repeats in KAP3 and its interaction with SmgGDS, regulated by Src phosphorylation, suggested KAP3 functions as a regulated protein–protein interaction scaffold linking signaling to motor transport.","evidence":"Yeast two-hybrid, recombinant protein binding assays, in vitro Src kinase assay","pmids":["8900189"],"confidence":"Medium","gaps":["Physiological relevance of SmgGDS interaction not tested in cells","In vivo phosphorylation by Src not demonstrated","Whether Src regulation affects kinesin-2 transport in cells unknown"]},{"year":1998,"claim":"Identification of a ternary complex between KAP3, KIF3B, and the condensin subunit HCAP in nuclear fractions raised the possibility that kinesin-2 functions extend to chromosome-associated processes.","evidence":"Yeast two-hybrid, co-immunoprecipitation from nuclear extracts","pmids":["9506951"],"confidence":"Medium","gaps":["No functional consequence of the HCAP–KAP3 interaction demonstrated","Nuclear role of kinesin-2 not validated by loss-of-function","Interaction not confirmed in other cell types"]},{"year":2004,"claim":"A temperature-sensitive KAP mutation in Chlamydomonas demonstrated that KAP3 is required in vivo for targeting kinesin-2 to the basal body and for maintaining anterograde IFT frequency, directly linking the adaptor subunit to cilium assembly.","evidence":"Temperature-sensitive mutant, video-enhanced DIC microscopy of IFT, transgenic rescue","pmids":["15616187"],"confidence":"High","gaps":["Whether KAP3 directly contacts IFT-B particles or uses an intermediate adaptor not determined","Mechanism by which the C-terminal domain mediates basal-body targeting unclear","Applicability to mammalian ciliogenesis not tested"]},{"year":2008,"claim":"Demonstrating that misfolded SOD1 sequesters KAP3, thereby impairing kinesin-2-dependent axonal transport of choline acetyltransferase, established KAP3 as a mechanistic link between protein misfolding and motor neuron transport deficits in ALS.","evidence":"Co-IP from spinal cord, ChAT transport assay, KAP3 overexpression rescue in NG108-15 cells, human FALS tissue immunostaining","pmids":["19088126"],"confidence":"High","gaps":["Whether KAP3 sequestration is sufficient to cause motor neuron degeneration not shown","Direct binding interface between SOD1 and KAP3 not mapped","Other kinesin-2 cargoes affected by SOD1-mediated KAP3 loss not catalogued"]},{"year":2022,"claim":"CRISPR knockout of KAP3 in gastric carcinoma cells revealed its requirement for post-Golgi laminin transport and RhoA-dependent circumferential actomyosin organization, extending KAP3 function to epithelial basement membrane integrity and cell–cell adhesion.","evidence":"CRISPR/Cas9 KO, immunofluorescence, RhoA activity assay, basement membrane formation assay","pmids":["35322078"],"confidence":"High","gaps":["Whether KAP3 directly binds laminin-containing vesicles or acts through an intermediate unknown","Whether RhoA inactivation is a direct or secondary consequence of transport failure not resolved","Relevance to normal epithelial morphogenesis not demonstrated"]},{"year":2024,"claim":"Structural and single-molecule work revealed that KIF3 tails contain a conserved beta-hairpin motif that autoinhibits the motor, and KAP3 binding creates a platform where cargo adaptors occlude this motif to activate processive motility, defining KAP3 as an allosteric activator of kinesin-2.","evidence":"Cryo-EM, single-molecule motility assays, mutagenesis (preprint)","pmids":[],"confidence":"High","gaps":["Peer review pending","Full set of physiological cargo adaptors that exploit this activation mechanism not catalogued","Whether autoinhibition relief differs between KIF3A- and KIF3B-enriched assemblies not determined"]},{"year":2026,"claim":"Discovery of a KIF3B-enriched, KAP3-associated kinesin-2 assembly that preferentially transports TRIM46 to the axon initial segment showed that kinesin-2 exists in distinct compositional states with cargo selectivity.","evidence":"Co-immunoprecipitation, cellular fractionation, live-cell imaging, structural analysis","pmids":["41910726"],"confidence":"Medium","gaps":["Stoichiometry of the KIF3B-enriched complex not fully resolved","How the tail conformation difference is regulated remains unclear","Whether other neuronal cargoes use the same KIF3B-enriched assembly unknown"]},{"year":null,"claim":"The full structural basis for how KAP3 selectively recognizes different cargoes through its Armadillo repeat domain, and how post-translational modifications such as Src phosphorylation regulate this selectivity in vivo, remains to be established.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of KAP3 Armadillo domain bound to a cargo adaptor peptide","In vivo phospho-regulation of KAP3 not demonstrated","Relative contributions of KAP3A vs KAP3B splice isoforms to cargo specificity unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,4,10]}],"localization":[{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[3,4,10]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[3]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,5]}],"pathway":[{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[3,4,5,8]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[3]}],"complexes":["Kinesin-2 (KIF3A/KIF3B/KAP3)"],"partners":["KIF3A","KIF3B","APC","TRIM46","SMGGDS","SOD1","NCAPH"],"other_free_text":[]},"mechanistic_narrative":"KIFAP3 (KAP3) is the non-motor adaptor subunit of the heterotrimeric kinesin-2 complex, essential for targeting the KIF3A/KIF3B motor to sites of intracellular transport and for coupling it to specific cargoes. KAP3 contains nine Armadillo repeats, binds the coiled-coil tail domain of KIF3 subunits without affecting intrinsic ATPase activity, and is required for efficient anterograde intraflagellar transport and flagellar/cilia assembly [PMID:8710890, PMID:15616187]. KAP3 serves as a cargo-recruitment platform: it engages cargo adaptors such as APC and TRIM46, and its binding occludes an autoinhibitory beta-hairpin motif in the KIF3 tails, thereby activating processive motility [PMID:41910726]. In neurons, KAP3-dependent kinesin-2 transports choline acetyltransferase along motor axons, and sequestration of KAP3 by misfolded SOD1 impairs this transport in ALS models; loss of KAP3 in epithelial cells disrupts post-Golgi laminin transport and cell–cell adhesion [PMID:19088126, PMID:35322078]."},"prefetch_data":{"uniprot":{"accession":"Q92845","full_name":"Kinesin-associated protein 3","aliases":["Smg GDS-associated protein"],"length_aa":792,"mass_kda":91.2,"function":"Involved in tethering the chromosomes to the spindle pole and in chromosome movement. Binds to the tail domain of the KIF3A/KIF3B heterodimer to form a heterotrimeric KIF3 complex and may regulate the membrane binding of this complex (By similarity)","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q92845/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KIFAP3","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000075945","cell_line_id":"CID001428","localizations":[{"compartment":"cytoplasmic","grade":3},{"compartment":"big_aggregates","grade":2},{"compartment":"nucleoplasm","grade":1}],"interactors":[{"gene":"KIF3A","stoichiometry":10.0},{"gene":"KIF3B","stoichiometry":10.0},{"gene":"BCAR1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001428","total_profiled":1310},"omim":[{"mim_id":"619309","title":"PROTEIN PHOSPHATASE, MAGNESIUM/MANGANESE-DEPENDENT, 1F; PPM1F","url":"https://www.omim.org/entry/619309"},{"mim_id":"601836","title":"KINESIN-ASSOCIATED PROTEIN 3; KIFAP3","url":"https://www.omim.org/entry/601836"},{"mim_id":"312610","title":"RETINITIS PIGMENTOSA GTPase REGULATOR; RPGR","url":"https://www.omim.org/entry/312610"},{"mim_id":"147450","title":"SUPEROXIDE DISMUTASE 1; SOD1","url":"https://www.omim.org/entry/147450"},{"mim_id":"118490","title":"CHOLINE ACETYLTRANSFERASE; CHAT","url":"https://www.omim.org/entry/118490"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Microtubules","reliability":"Approved"},{"location":"Basal body","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/KIFAP3"},"hgnc":{"alias_symbol":["SMAP","KAP3","FLA3","KAP-1"],"prev_symbol":[]},"alphafold":{"accession":"Q92845","domains":[{"cath_id":"-","chopping":"8-97","consensus_level":"high","plddt":83.7442,"start":8,"end":97},{"cath_id":"1.25.10","chopping":"133-290","consensus_level":"high","plddt":94.6285,"start":133,"end":290},{"cath_id":"1.25.10.10","chopping":"303-412","consensus_level":"medium","plddt":96.3015,"start":303,"end":412},{"cath_id":"1.25.10.10","chopping":"537-690_775-781","consensus_level":"medium","plddt":89.9853,"start":537,"end":781}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92845","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92845-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92845-F1-predicted_aligned_error_v6.png","plddt_mean":83.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KIFAP3","jax_strain_url":"https://www.jax.org/strain/search?query=KIFAP3"},"sequence":{"accession":"Q92845","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92845.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92845/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92845"}},"corpus_meta":[{"pmid":"11959841","id":"PMC_11959841","title":"SETDB1: 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microsequencing, cDNA cloning, baculovirus/Sf9 reconstitution, immunolocalization\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in Sf9 cells plus biochemical pulldown and motor activity assay; original discovery paper\",\n      \"pmids\": [\"8710890\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"SMAP/KAP3 (KIFAP3) was identified as a human counterpart of mouse KAP3; it forms a ternary complex with HCAP (a condensin subunit) and KIF3B extractable from the nuclear fraction in the presence of Mg-ATP, suggesting KAP3 links chromosomal proteins to the KIF3 motor in the nucleus.\",\n      \"method\": \"Yeast two-hybrid screen, co-immunoprecipitation, subcellular fractionation, Western blotting\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP and fractionation from nuclear extract, single lab\",\n      \"pmids\": [\"9506951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"SMAP/KAP3 (KIFAP3) contains nine Armadillo repeats, interacts with SmgGDS (a small-GTPase GDP/GTP exchange factor), and is a substrate for Src tyrosine kinase phosphorylation; phosphorylation by Src reduces the affinity of KAP3 for SmgGDS.\",\n      \"method\": \"Yeast two-hybrid isolation, recombinant protein binding assay, in vitro Src kinase assay, subcellular fractionation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro kinase assay plus binding assay with purified proteins, single lab\",\n      \"pmids\": [\"8900189\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"In Chlamydomonas, the KAP (KAP3 ortholog) subunit of kinesin-2 is required for targeting/retaining the kinesin-2 complex at the basal body region and for efficient anterograde intraflagellar transport (IFT); a point mutation in the conserved C-terminal domain of KAP causes reduced frequency of anterograde IFT particles and flagellar loss at restrictive temperature.\",\n      \"method\": \"Temperature-sensitive mutant analysis, video-enhanced DIC microscopy of IFT, epitope-tagged rescue transformation, immunolocalization\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with specific cellular phenotype (IFT frequency/localization) plus transgenic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"15616187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Misfolded mutant SOD1 specifically associates with KAP3 (KIFAP3) in motor axons of SOD1(G93A) mice from pre-onset stage, sequestering KAP3 from the kinesin-2 complex and thereby impairing axonal transport of its cargo choline acetyltransferase (ChAT); KAP3 overexpression normalized impaired acetylcholine release in a cell model.\",\n      \"method\": \"Co-immunoprecipitation from spinal cord, immunohistochemistry, ChAT transport assay, KAP3 overexpression rescue in NG108-15 cells, human FALS tissue immunostaining\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (Co-IP, transport assay, rescue experiment, human tissue validation), replicated in mouse model and human cases\",\n      \"pmids\": [\"19088126\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Loss of KAP3 (KIFAP3) in gastric signet-ring cell carcinoma cells impairs post-Golgi transport of laminin (disrupting basement membrane formation) and inactivates RhoA, thereby disrupting circumferential actomyosin cables and weakening cell–cell adhesion.\",\n      \"method\": \"CRISPR/Cas9 knockout, immunofluorescence, RhoA activity assay, basement membrane formation assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular phenotypes (adhesion, actomyosin, laminin transport), multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"35322078\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Aroclor 1254 exposure significantly reduces KAP3 mRNA levels in hypothalamic tissue during critical periods of brain sexual differentiation and puberty in rat, correlating with impaired reproductive function, establishing KAP3 transcription as sensitive to endocrine disruption during neurogenesis.\",\n      \"method\": \"Northern blot hybridization in vivo, reproductive endpoint measurement\",\n      \"journal\": \"Reproduction, fertility, and development\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — in vivo expression change without direct mechanistic rescue; correlative but in vivo\",\n      \"pmids\": [\"17524298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"C. elegans KAP-1 (ortholog of KIFAP3/KAP3) contains an Armadillo consensus motif conserved from sea urchin KAP115 and is predicted to form a heterotrimeric complex with KLP-11 and OSM-3 kinesins, consistent with its role as the non-motor adaptor subunit of kinesin-2.\",\n      \"method\": \"cDNA sequencing, sequence homology analysis, structural prediction\",\n      \"journal\": \"DNA research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational/sequence-based prediction only, no functional experiment\",\n      \"pmids\": [\"10819327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Biochemical and cellular analyses revealed a KIF3B-enriched, KAP3-associated kinesin-2 assembly (distinct from the canonical KIF3A/B/KAP3 heterotrimer) that preferentially associates with TRIM46 and facilitates its transport to the axon initial segment; structural analyses suggest differences in tail conformation accompany distinct assembly states and may underlie cargo selectivity.\",\n      \"method\": \"Co-immunoprecipitation, cellular fractionation, live-cell imaging, structural analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP plus cellular and structural analyses, single lab, peer-reviewed\",\n      \"pmids\": [\"41910726\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cryo-EM structures of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) bound to APC cargo revealed a previously uncharacterized 'Hitchdock domain' in KIF3 tails that mediates interactions with both the KAP3 adaptor subunit and the APC cargo; mutagenesis and molecular dynamics confirmed this domain's functional importance for cargo binding.\",\n      \"method\": \"Cryo-electron microscopy, mutagenesis, molecular dynamics simulations, cargo-binding assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution cryo-EM structure with mutagenesis and MD validation; multiple orthogonal methods in single study\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Structural and single-molecule analyses of the kinesin-2 heterotrimer revealed a conserved beta-hairpin motif in KIF3 tails that autoinhibits motility by sequestering motor domains away from microtubules; KAP3 (Kap3) binding creates a platform on which cargo adaptors engage and occlude the beta-hairpin motif, thereby activating motility.\",\n      \"method\": \"Cryo-EM/structural analysis, single-molecule motility assays, cell biological assays, mutagenesis\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — structural, single-molecule, and cell biological approaches combined in one study; defines KAP3 role in activation mechanism\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"KIFAP3 (KAP3) is the non-motor accessory/adaptor subunit of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) that binds via a multipartite interface to the KIF3 tail 'Hitchdock domain'; it does not affect intrinsic motor ATPase activity but is essential for targeting kinesin-2 to the site of flagellar/cilia assembly, enabling processive anterograde intraflagellar transport, and for recruiting cargoes (including APC and TRIM46) by providing a platform that occludes the autoinhibitory beta-hairpin motif of the KIF3 tails; in neurons KAP3 mediates axonal transport of choline acetyltransferase and other cargoes, and sequestration of KAP3 by misfolded SOD1 impairs this transport in ALS models.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KIFAP3 (KAP3) is the non-motor adaptor subunit of the heterotrimeric kinesin-2 complex, essential for targeting the KIF3A/KIF3B motor to sites of intracellular transport and for coupling it to specific cargoes. KAP3 contains nine Armadillo repeats, binds the coiled-coil tail domain of KIF3 subunits without affecting intrinsic ATPase activity, and is required for efficient anterograde intraflagellar transport and flagellar/cilia assembly [PMID:8710890, PMID:15616187]. KAP3 serves as a cargo-recruitment platform: it engages cargo adaptors such as APC and TRIM46, and its binding occludes an autoinhibitory beta-hairpin motif in the KIF3 tails, thereby activating processive motility [PMID:41910726]. In neurons, KAP3-dependent kinesin-2 transports choline acetyltransferase along motor axons, and sequestration of KAP3 by misfolded SOD1 impairs this transport in ALS models; loss of KAP3 in epithelial cells disrupts post-Golgi laminin transport and cell–cell adhesion [PMID:19088126, PMID:35322078].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Identifying KAP3 as a non-motor subunit of kinesin-2 established that this motor operates as a heterotrimer rather than a simple heterodimer, and that KAP3 associates with the motor tail without altering its enzymatic activity.\",\n      \"evidence\": \"Immunoprecipitation, microsequencing, baculovirus/Sf9 reconstitution, and motor ATPase assays from mouse testis\",\n      \"pmids\": [\"8710890\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo identity unknown at this stage\", \"No structural information on the KAP3–tail interface\", \"Cellular function of the two splice isoforms (KAP3A/B) unresolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Discovery of nine Armadillo repeats in KAP3 and its interaction with SmgGDS, regulated by Src phosphorylation, suggested KAP3 functions as a regulated protein–protein interaction scaffold linking signaling to motor transport.\",\n      \"evidence\": \"Yeast two-hybrid, recombinant protein binding assays, in vitro Src kinase assay\",\n      \"pmids\": [\"8900189\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological relevance of SmgGDS interaction not tested in cells\", \"In vivo phosphorylation by Src not demonstrated\", \"Whether Src regulation affects kinesin-2 transport in cells unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of a ternary complex between KAP3, KIF3B, and the condensin subunit HCAP in nuclear fractions raised the possibility that kinesin-2 functions extend to chromosome-associated processes.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation from nuclear extracts\",\n      \"pmids\": [\"9506951\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence of the HCAP–KAP3 interaction demonstrated\", \"Nuclear role of kinesin-2 not validated by loss-of-function\", \"Interaction not confirmed in other cell types\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"A temperature-sensitive KAP mutation in Chlamydomonas demonstrated that KAP3 is required in vivo for targeting kinesin-2 to the basal body and for maintaining anterograde IFT frequency, directly linking the adaptor subunit to cilium assembly.\",\n      \"evidence\": \"Temperature-sensitive mutant, video-enhanced DIC microscopy of IFT, transgenic rescue\",\n      \"pmids\": [\"15616187\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KAP3 directly contacts IFT-B particles or uses an intermediate adaptor not determined\", \"Mechanism by which the C-terminal domain mediates basal-body targeting unclear\", \"Applicability to mammalian ciliogenesis not tested\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrating that misfolded SOD1 sequesters KAP3, thereby impairing kinesin-2-dependent axonal transport of choline acetyltransferase, established KAP3 as a mechanistic link between protein misfolding and motor neuron transport deficits in ALS.\",\n      \"evidence\": \"Co-IP from spinal cord, ChAT transport assay, KAP3 overexpression rescue in NG108-15 cells, human FALS tissue immunostaining\",\n      \"pmids\": [\"19088126\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KAP3 sequestration is sufficient to cause motor neuron degeneration not shown\", \"Direct binding interface between SOD1 and KAP3 not mapped\", \"Other kinesin-2 cargoes affected by SOD1-mediated KAP3 loss not catalogued\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CRISPR knockout of KAP3 in gastric carcinoma cells revealed its requirement for post-Golgi laminin transport and RhoA-dependent circumferential actomyosin organization, extending KAP3 function to epithelial basement membrane integrity and cell–cell adhesion.\",\n      \"evidence\": \"CRISPR/Cas9 KO, immunofluorescence, RhoA activity assay, basement membrane formation assay\",\n      \"pmids\": [\"35322078\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KAP3 directly binds laminin-containing vesicles or acts through an intermediate unknown\", \"Whether RhoA inactivation is a direct or secondary consequence of transport failure not resolved\", \"Relevance to normal epithelial morphogenesis not demonstrated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Structural and single-molecule work revealed that KIF3 tails contain a conserved beta-hairpin motif that autoinhibits the motor, and KAP3 binding creates a platform where cargo adaptors occlude this motif to activate processive motility, defining KAP3 as an allosteric activator of kinesin-2.\",\n      \"evidence\": \"Cryo-EM, single-molecule motility assays, mutagenesis (preprint)\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Peer review pending\", \"Full set of physiological cargo adaptors that exploit this activation mechanism not catalogued\", \"Whether autoinhibition relief differs between KIF3A- and KIF3B-enriched assemblies not determined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Discovery of a KIF3B-enriched, KAP3-associated kinesin-2 assembly that preferentially transports TRIM46 to the axon initial segment showed that kinesin-2 exists in distinct compositional states with cargo selectivity.\",\n      \"evidence\": \"Co-immunoprecipitation, cellular fractionation, live-cell imaging, structural analysis\",\n      \"pmids\": [\"41910726\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry of the KIF3B-enriched complex not fully resolved\", \"How the tail conformation difference is regulated remains unclear\", \"Whether other neuronal cargoes use the same KIF3B-enriched assembly unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full structural basis for how KAP3 selectively recognizes different cargoes through its Armadillo repeat domain, and how post-translational modifications such as Src phosphorylation regulate this selectivity in vivo, remains to be established.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of KAP3 Armadillo domain bound to a cargo adaptor peptide\", \"In vivo phospho-regulation of KAP3 not demonstrated\", \"Relative contributions of KAP3A vs KAP3B splice isoforms to cargo specificity unknown\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 4, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [3, 4, 10]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [3, 4, 5, 8]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"Kinesin-2 (KIF3A/KIF3B/KAP3)\"\n    ],\n    \"partners\": [\n      \"KIF3A\",\n      \"KIF3B\",\n      \"APC\",\n      \"TRIM46\",\n      \"SmgGDS\",\n      \"SOD1\",\n      \"NCAPH\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}