{"gene":"ENKD1","run_date":"2026-06-09T23:54:43","timeline":{"discoveries":[{"year":2022,"finding":"ENKD1 is a stable centrosomal protein that promotes removal of CP110 from the mother centriole to initiate ciliogenesis by competing with CEP97 for binding to CP110; depletion of ENKD1 enhances the CP110-CEP97 interaction and detains CP110 at the mother centriole, while simultaneous knockdown of CP110 reverses the ciliogenesis defects caused by ENKD1 loss.","method":"Super-resolution microscopy, protein interaction/co-immunoprecipitation assays, genetic epistasis (double knockdown rescue), Enkd1 knockout mice","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal protein interaction assays, genetic epistasis (double KD rescue), in vivo knockout model, multiple orthogonal methods in a single focused study","pmids":["35301795"],"is_preprint":false},{"year":2022,"finding":"ENKD1 is a microtubule-binding protein that promotes astral microtubule stability to regulate mitotic spindle orientation in basal keratinocytes; its loss impairs spindle orientation and delays mitotic progression, leading to thinner epidermis in Enkd1 knockout mice due to reduced asymmetric division; re-introduction of the ENKD1 microtubule-binding domain rescues spindle orientation defects.","method":"Enkd1 knockout mice, microtubule co-sedimentation/binding assays, domain rescue experiments, live imaging of spindle orientation","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro microtubule binding, domain-level rescue, in vivo knockout, multiple orthogonal methods","pmids":["35197565"],"is_preprint":false},{"year":2022,"finding":"ENKD1 localizes to the centriole wall and the ciliary axoneme and functions as a microtubule-associated protein (MAP) that regulates microtubule organization and stability; ENKD1 overexpression increases tubulin polymerization and microtubule stability; ENKD1-depleted cells show defects in ciliary length and content regulation and fail to respond to Hedgehog pathway activation.","method":"In vitro tubulin polymerization assays, cellular microtubule stability assays, proximity interaction proteomics (BioID), immunofluorescence localization, Hedgehog pathway reporter assays, ENKD1 knockdown","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro biochemical assay plus cellular assays plus proximity proteomics, single lab but multiple orthogonal methods","pmids":["35072334"],"is_preprint":false},{"year":2024,"finding":"The deubiquitinase CYLD interacts with ENKD1 and deubiquitinates it at lysine residues K141 and K242; deubiquitinated ENKD1 then interacts with Ezrin and stimulates Ezrin's microvillar localization, which is essential for phagocytic activity of retinal pigment epithelium (RPE) cells; CYLD-deficient mice exhibit abnormal retinal structure and impaired photoreceptor outer segment phagocytosis.","method":"Co-immunoprecipitation, ubiquitination site mapping (K141/K242), deubiquitinase assay, Cyld knockout mice, Ezrin localization by fluorescence microscopy, phagocytosis assays","journal":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical deubiquitination assay with site-specific mutagenesis, Co-IP, in vivo knockout model, multiple orthogonal methods","pmids":["39373352"],"is_preprint":false},{"year":2025,"finding":"HDAC6 deacetylates ENKD1 at lysine 98, which impedes ENKD1's interaction with γ-tubulin and restrains the centrosomal localization of ENKD1, thereby disrupting mitotic spindle orientation and positioning in corneal epithelial cells.","method":"Deacetylation assays, site-specific mutagenesis (K98), co-immunoprecipitation (ENKD1-γ-tubulin interaction), immunofluorescence centrosomal localization, HDAC6 overexpression in mouse cornea","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — biochemical deacetylation with site-specific mutagenesis, Co-IP interaction mapping, centrosomal localization assay, in vivo overexpression model","pmids":["40155750"],"is_preprint":false},{"year":2025,"finding":"ENKD1 interacts with geranylgeranyl diphosphate synthase 1 (GGPS1) and modulates its enzymatic activity, reducing geranylgeranyl diphosphate production, which leads to RAC1 inactivation and suppression of pro-inflammatory signaling; ENKD1 expression is downregulated upon TLR activation, and ENKD1 deletion enhances innate immune activation and exacerbates septic inflammation.","method":"Co-immunoprecipitation (ENKD1-GGPS1), enzymatic activity assays for GGPS1, RAC1 activation assays, ENKD1 knockout mouse model, TLR stimulation assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with enzymatic activity assay and in vivo KO model, single lab, multiple methods but abstract-level detail limits full tier 1 assignment","pmids":["40048432"],"is_preprint":false},{"year":2025,"finding":"ENKD1 interacts with the E3 ubiquitin ligase TRIM21, which mediates K48-linked polyubiquitination and degradation of RUBCN (Run domain Beclin-1-interacting and cysteine-rich domain-containing protein), thereby suppressing LC3-associated phagocytosis (LAP); ENKD1-deficient macrophages show enhanced LAP, increased ROS production, enhanced LC3 lipidation on phagosomes, and improved phagosome-lysosome fusion, and ENKD1-deficient mice exhibit improved bacterial clearance.","method":"Co-immunoprecipitation (ENKD1-TRIM21), ubiquitination assay (K48-linked), RUBCN degradation assay, LC3 lipidation assay, phagosome-lysosome fusion assay, ROS measurement, ENKD1 knockout mice with infection model","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, ubiquitination linkage assay, in vivo KO infection model, multiple orthogonal functional assays","pmids":["41187080"],"is_preprint":false},{"year":2025,"finding":"ENKD1 localizes to centrosomes and microtubules in basal keratinocytes and enhances microtubule stability; loss of ENKD1 destabilizes microtubules and impairs keratinocyte migration, reducing epidermal elasticity; ENKD1 exerts its effects on microtubule stability via EB1.","method":"Enkd1 knockout mice, immunofluorescence localization (centrosome/microtubule), microtubule stability assays, keratinocyte migration assays, EB1 interaction/functional studies","journal":"Cytoskeleton (Hoboken, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2–3 / Weak — single lab, single publication, localization and stability assays described but EB1 mechanistic link not fully elaborated in abstract","pmids":["40879264"],"is_preprint":false}],"current_model":"ENKD1 is a centrosomal and microtubule-associated protein that (1) promotes ciliogenesis by competing with CEP97 to displace CP110 from the mother centriole; (2) stabilizes astral microtubules to orient the mitotic spindle; (3) is deacetylated by HDAC6 at K98, which disrupts its interaction with γ-tubulin and its centrosomal localization; (4) is deubiquitinated by CYLD at K141/K242, enabling ENKD1-Ezrin interaction and RPE phagocytosis; (5) suppresses innate immunity by binding GGPS1 to reduce geranylgeranyl diphosphate production and inactivate RAC1; and (6) dampens antibacterial LC3-associated phagocytosis through a TRIM21-mediated K48-ubiquitination and degradation of RUBCN."},"narrative":{"mechanistic_narrative":"ENKD1 is a centrosome- and microtubule-associated protein that couples microtubule organization to ciliogenesis, mitotic spindle control, and innate immune regulation [PMID:35301795, PMID:35197565, PMID:35072334]. At the mother centriole it initiates ciliogenesis by competing with CEP97 for binding to CP110, promoting CP110 removal; its loss detains CP110 and blocks cilium formation, a defect reversed by concurrent CP110 knockdown [PMID:35301795]. As a microtubule-binding protein localizing to the centriole wall and ciliary axoneme, it increases tubulin polymerization and microtubule stability, regulating ciliary length and Hedgehog responsiveness [PMID:35072334], and stabilizes astral microtubules through EB1 to orient the mitotic spindle, supporting asymmetric division and epidermal architecture [PMID:35197565, PMID:40879264]. ENKD1 activity is governed by post-translational modification: HDAC6 deacetylates it at K98 to disrupt its γ-tubulin interaction and centrosomal localization [PMID:40155750], while CYLD deubiquitinates it at K141/K242 to enable an ENKD1–Ezrin interaction required for RPE phagocytosis [PMID:39373352]. Beyond the cytoskeleton, ENKD1 restrains innate immunity, binding GGPS1 to lower geranylgeranyl diphosphate production and inactivate RAC1 [PMID:40048432], and acting with the E3 ligase TRIM21 to drive K48-linked ubiquitination and degradation of RUBCN, thereby dampening LC3-associated phagocytosis and bacterial clearance [PMID:41187080].","teleology":[{"year":2022,"claim":"Established ENKD1 as a centrosomal initiator of ciliogenesis acting through the CP110/CEP97 cap, answering how it controls cilium assembly.","evidence":"Co-IP, super-resolution microscopy, double-knockdown epistasis rescue and Enkd1 knockout mice","pmids":["35301795"],"confidence":"High","gaps":["Structural basis of ENKD1-CP110 competition with CEP97 not resolved","Whether ENKD1 acts catalytically or stoichiometrically at the centriole unclear"]},{"year":2022,"claim":"Defined ENKD1 as a microtubule-binding protein that stabilizes astral microtubules to orient the spindle, linking it to asymmetric division and epidermal thickness.","evidence":"Microtubule co-sedimentation, domain rescue, live spindle imaging in Enkd1 knockout mice","pmids":["35197565"],"confidence":"High","gaps":["Molecular determinants of microtubule binding within the domain not mapped at residue level","How spindle orientation cues are transmitted to ENKD1 unknown"]},{"year":2022,"claim":"Showed ENKD1 directly promotes tubulin polymerization and microtubule stability at the centriole wall and axoneme, tying its MAP activity to ciliary content and Hedgehog signaling.","evidence":"In vitro tubulin polymerization, cellular stability assays, BioID proximity proteomics, Hedgehog reporter assays","pmids":["35072334"],"confidence":"High","gaps":["Direct effectors downstream of ciliary length defects not identified","Mechanism by which ENKD1 senses or regulates ciliary content unclear"]},{"year":2024,"claim":"Identified a CYLD-dependent deubiquitination switch (K141/K242) that licenses ENKD1-Ezrin interaction for RPE phagocytosis, revealing post-translational control of an ENKD1 function outside the cilium.","evidence":"Co-IP, ubiquitination site mapping, deubiquitinase assay, Cyld knockout mice, phagocytosis assays","pmids":["39373352"],"confidence":"High","gaps":["The E3 ligase that ubiquitinates ENKD1 at K141/K242 not identified","How Ezrin engagement is structurally coupled to ENKD1 deubiquitination unclear"]},{"year":2025,"claim":"Defined a HDAC6-mediated deacetylation event at K98 that disrupts ENKD1-γ-tubulin binding and centrosomal targeting, providing a second layer of PTM control over spindle positioning.","evidence":"Deacetylation and site-specific mutagenesis assays, Co-IP, centrosomal localization imaging, HDAC6 overexpression in mouse cornea","pmids":["40155750"],"confidence":"High","gaps":["The acetyltransferase opposing HDAC6 at K98 not identified","Whether acetylation state interacts with the CYLD ubiquitination switch unknown"]},{"year":2025,"claim":"Revealed an immune-suppressive role: ENKD1 binds GGPS1 to reduce geranylgeranyl diphosphate and inactivate RAC1, dampening pro-inflammatory signaling.","evidence":"Co-IP, GGPS1 enzymatic activity assays, RAC1 activation assays, TLR stimulation, ENKD1 knockout mice","pmids":["40048432"],"confidence":"Medium","gaps":["Abstract-level detail limits full mechanistic confidence","How ENKD1 modulates GGPS1 catalysis biochemically not defined","Relationship between cytoskeletal and immune functions unclear"]},{"year":2025,"claim":"Showed ENKD1 acts with TRIM21 to drive K48-ubiquitination and degradation of RUBCN, suppressing LC3-associated phagocytosis and bacterial clearance.","evidence":"Reciprocal Co-IP, K48-linkage ubiquitination assay, RUBCN degradation, LC3 lipidation and phagosome-lysosome fusion assays, ENKD1 knockout infection model","pmids":["41187080"],"confidence":"High","gaps":["Whether ENKD1 is a substrate adaptor or activator of TRIM21 not resolved","How this LAP role relates to ENKD1's centrosomal functions unknown"]},{"year":2025,"claim":"Extended the microtubule-stabilizing role to keratinocyte migration and epidermal elasticity, implicating EB1 as a functional partner.","evidence":"Enkd1 knockout mice, localization imaging, microtubule stability and migration assays, EB1 interaction studies","pmids":["40879264"],"confidence":"Medium","gaps":["EB1 mechanistic link not fully elaborated","Direct vs indirect ENKD1-EB1 interaction not established"]},{"year":null,"claim":"How ENKD1's cytoskeletal/ciliary roles mechanistically integrate with its immune-regulatory functions, and what governs partitioning between these activities, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying model linking centrosomal localization to GGPS1/TRIM21 immune signaling","No structural data on ENKD1 or its binding interfaces","Coordination between the K98 acetylation and K141/K242 ubiquitination switches unexplored"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,2,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,5]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[0,4,7]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,2,7]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[0,2]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,4]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,6]}],"complexes":[],"partners":["CP110","CEP97","GGPS1","TRIM21","CYLD","HDAC6","EZR","EB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9H0I2","full_name":"Enkurin domain-containing protein 1","aliases":[],"length_aa":346,"mass_kda":38.8,"function":"Microtubule-binding protein which regulates microtubule organization and stability (PubMed:35072334, PubMed:35197565). Promotes the stability of astral microtubules and facilitates the proper orientation of the mitotic spindle (PubMed:35197565). This allows the oriented division of basal keratinocytes and contributes to epidermal stratification (By similarity). Required for the assembly of both primary and motile cilia (PubMed:35301795). Destabilizes the interaction between CCP110 and CEP97 by competing with CEP97 for binding to CCP110 which promotes the removal of CCP110 and CEP97 from the mother centriole and allows the initiation of ciliogenesis (PubMed:35301795)","subcellular_location":"Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome, centriole; Cytoplasm, cytoskeleton, cilium basal body; Cell projection, cilium; Cytoplasm, cytoskeleton, spindle; Cytoplasm, cytoskeleton, spindle pole; Cytoplasm, cytoskeleton, cilium axoneme","url":"https://www.uniprot.org/uniprotkb/Q9H0I2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ENKD1","classification":"Not Classified","n_dependent_lines":39,"n_total_lines":1208,"dependency_fraction":0.03228476821192053},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ENKD1","total_profiled":1310},"omim":[{"mim_id":"621119","title":"ENKURIN DOMAIN-CONTAINING PROTEIN 1; ENKD1","url":"https://www.omim.org/entry/621119"},{"mim_id":"605018","title":"CYLD LYSINE-63 DEUBIQUITINASE; CYLD","url":"https://www.omim.org/entry/605018"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Centrosome","reliability":"Supported"},{"location":"Basal body","reliability":"Supported"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ENKD1"},"hgnc":{"alias_symbol":["DKFZP434A1319","FBB11"],"prev_symbol":["C16orf48"]},"alphafold":{"accession":"Q9H0I2","domains":[{"cath_id":"1.10.287","chopping":"288-344","consensus_level":"high","plddt":94.3098,"start":288,"end":344}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0I2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0I2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9H0I2-F1-predicted_aligned_error_v6.png","plddt_mean":76.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ENKD1","jax_strain_url":"https://www.jax.org/strain/search?query=ENKD1"},"sequence":{"accession":"Q9H0I2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9H0I2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9H0I2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9H0I2"}},"corpus_meta":[{"pmid":"35301795","id":"PMC_35301795","title":"ENKD1 promotes CP110 removal through competing with CEP97 to initiate ciliogenesis.","date":"2022","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/35301795","citation_count":26,"is_preprint":false},{"pmid":"35197565","id":"PMC_35197565","title":"ENKD1 promotes epidermal stratification by regulating spindle orientation in basal keratinocytes.","date":"2022","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/35197565","citation_count":24,"is_preprint":false},{"pmid":"35072334","id":"PMC_35072334","title":"ENKD1 is a centrosomal and ciliary microtubule-associated protein important for primary cilium content regulation.","date":"2022","source":"The FEBS journal","url":"https://pubmed.ncbi.nlm.nih.gov/35072334","citation_count":9,"is_preprint":false},{"pmid":"33724673","id":"PMC_33724673","title":"Enkurin domain containing 1 (ENKD1) regulates the proliferation, migration and invasion of non-small cell lung cancer cells.","date":"2021","source":"Asia-Pacific journal of clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/33724673","citation_count":8,"is_preprint":false},{"pmid":"39373352","id":"PMC_39373352","title":"CYLD Maintains Retinal Homeostasis by Deubiquitinating ENKD1 and Promoting the Phagocytosis of Photoreceptor Outer Segments.","date":"2024","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/39373352","citation_count":7,"is_preprint":false},{"pmid":"36960713","id":"PMC_36960713","title":"Upregulation of ENKD1 disrupts cellular homeostasis to promote lymphoma development.","date":"2023","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/36960713","citation_count":2,"is_preprint":false},{"pmid":"40048432","id":"PMC_40048432","title":"ENKD1 modulates innate immune responses through enhanced geranylgeranyl pyrophosphate synthase activity.","date":"2025","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/40048432","citation_count":2,"is_preprint":false},{"pmid":"41187080","id":"PMC_41187080","title":"ENKD1 attenuates antibacterial immunity by facilitating TRIM21-mediated RUBCN degradation to suppress LC3-associated phagocytosis.","date":"2025","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/41187080","citation_count":1,"is_preprint":false},{"pmid":"40155750","id":"PMC_40155750","title":"HDAC6 deacetylates ENKD1 to regulate mitotic spindle behavior and corneal epithelial homeostasis.","date":"2025","source":"EMBO reports","url":"https://pubmed.ncbi.nlm.nih.gov/40155750","citation_count":1,"is_preprint":false},{"pmid":"40304823","id":"PMC_40304823","title":"MiR-760 protects against lipopolysaccharide-induced septic acute kidney injury by targeting ENKD1.","date":"2025","source":"Clinical and experimental nephrology","url":"https://pubmed.ncbi.nlm.nih.gov/40304823","citation_count":1,"is_preprint":false},{"pmid":"40879264","id":"PMC_40879264","title":"ENKD1 Modulates Skin Elasticity Through Microtubule Stability Regulation.","date":"2025","source":"Cytoskeleton (Hoboken, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/40879264","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6834,"output_tokens":2464,"usd":0.028731,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9533,"output_tokens":3097,"usd":0.062545,"stage2_stop_reason":"end_turn"},"total_usd":0.091276,"stage1_batch_id":"msgbatch_01AsR7g8dGTEiEw9U83bJeWn","stage2_batch_id":"msgbatch_01YV5ZyxtFNUZEjxRcpd9jzb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"ENKD1 is a stable centrosomal protein that promotes removal of CP110 from the mother centriole to initiate ciliogenesis by competing with CEP97 for binding to CP110; depletion of ENKD1 enhances the CP110-CEP97 interaction and detains CP110 at the mother centriole, while simultaneous knockdown of CP110 reverses the ciliogenesis defects caused by ENKD1 loss.\",\n      \"method\": \"Super-resolution microscopy, protein interaction/co-immunoprecipitation assays, genetic epistasis (double knockdown rescue), Enkd1 knockout mice\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal protein interaction assays, genetic epistasis (double KD rescue), in vivo knockout model, multiple orthogonal methods in a single focused study\",\n      \"pmids\": [\"35301795\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ENKD1 is a microtubule-binding protein that promotes astral microtubule stability to regulate mitotic spindle orientation in basal keratinocytes; its loss impairs spindle orientation and delays mitotic progression, leading to thinner epidermis in Enkd1 knockout mice due to reduced asymmetric division; re-introduction of the ENKD1 microtubule-binding domain rescues spindle orientation defects.\",\n      \"method\": \"Enkd1 knockout mice, microtubule co-sedimentation/binding assays, domain rescue experiments, live imaging of spindle orientation\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro microtubule binding, domain-level rescue, in vivo knockout, multiple orthogonal methods\",\n      \"pmids\": [\"35197565\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ENKD1 localizes to the centriole wall and the ciliary axoneme and functions as a microtubule-associated protein (MAP) that regulates microtubule organization and stability; ENKD1 overexpression increases tubulin polymerization and microtubule stability; ENKD1-depleted cells show defects in ciliary length and content regulation and fail to respond to Hedgehog pathway activation.\",\n      \"method\": \"In vitro tubulin polymerization assays, cellular microtubule stability assays, proximity interaction proteomics (BioID), immunofluorescence localization, Hedgehog pathway reporter assays, ENKD1 knockdown\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro biochemical assay plus cellular assays plus proximity proteomics, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"35072334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The deubiquitinase CYLD interacts with ENKD1 and deubiquitinates it at lysine residues K141 and K242; deubiquitinated ENKD1 then interacts with Ezrin and stimulates Ezrin's microvillar localization, which is essential for phagocytic activity of retinal pigment epithelium (RPE) cells; CYLD-deficient mice exhibit abnormal retinal structure and impaired photoreceptor outer segment phagocytosis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination site mapping (K141/K242), deubiquitinase assay, Cyld knockout mice, Ezrin localization by fluorescence microscopy, phagocytosis assays\",\n      \"journal\": \"Advanced science (Weinheim, Baden-Wurttemberg, Germany)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical deubiquitination assay with site-specific mutagenesis, Co-IP, in vivo knockout model, multiple orthogonal methods\",\n      \"pmids\": [\"39373352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HDAC6 deacetylates ENKD1 at lysine 98, which impedes ENKD1's interaction with γ-tubulin and restrains the centrosomal localization of ENKD1, thereby disrupting mitotic spindle orientation and positioning in corneal epithelial cells.\",\n      \"method\": \"Deacetylation assays, site-specific mutagenesis (K98), co-immunoprecipitation (ENKD1-γ-tubulin interaction), immunofluorescence centrosomal localization, HDAC6 overexpression in mouse cornea\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — biochemical deacetylation with site-specific mutagenesis, Co-IP interaction mapping, centrosomal localization assay, in vivo overexpression model\",\n      \"pmids\": [\"40155750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ENKD1 interacts with geranylgeranyl diphosphate synthase 1 (GGPS1) and modulates its enzymatic activity, reducing geranylgeranyl diphosphate production, which leads to RAC1 inactivation and suppression of pro-inflammatory signaling; ENKD1 expression is downregulated upon TLR activation, and ENKD1 deletion enhances innate immune activation and exacerbates septic inflammation.\",\n      \"method\": \"Co-immunoprecipitation (ENKD1-GGPS1), enzymatic activity assays for GGPS1, RAC1 activation assays, ENKD1 knockout mouse model, TLR stimulation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with enzymatic activity assay and in vivo KO model, single lab, multiple methods but abstract-level detail limits full tier 1 assignment\",\n      \"pmids\": [\"40048432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ENKD1 interacts with the E3 ubiquitin ligase TRIM21, which mediates K48-linked polyubiquitination and degradation of RUBCN (Run domain Beclin-1-interacting and cysteine-rich domain-containing protein), thereby suppressing LC3-associated phagocytosis (LAP); ENKD1-deficient macrophages show enhanced LAP, increased ROS production, enhanced LC3 lipidation on phagosomes, and improved phagosome-lysosome fusion, and ENKD1-deficient mice exhibit improved bacterial clearance.\",\n      \"method\": \"Co-immunoprecipitation (ENKD1-TRIM21), ubiquitination assay (K48-linked), RUBCN degradation assay, LC3 lipidation assay, phagosome-lysosome fusion assay, ROS measurement, ENKD1 knockout mice with infection model\",\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, ubiquitination linkage assay, in vivo KO infection model, multiple orthogonal functional assays\",\n      \"pmids\": [\"41187080\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ENKD1 localizes to centrosomes and microtubules in basal keratinocytes and enhances microtubule stability; loss of ENKD1 destabilizes microtubules and impairs keratinocyte migration, reducing epidermal elasticity; ENKD1 exerts its effects on microtubule stability via EB1.\",\n      \"method\": \"Enkd1 knockout mice, immunofluorescence localization (centrosome/microtubule), microtubule stability assays, keratinocyte migration assays, EB1 interaction/functional studies\",\n      \"journal\": \"Cytoskeleton (Hoboken, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Weak — single lab, single publication, localization and stability assays described but EB1 mechanistic link not fully elaborated in abstract\",\n      \"pmids\": [\"40879264\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ENKD1 is a centrosomal and microtubule-associated protein that (1) promotes ciliogenesis by competing with CEP97 to displace CP110 from the mother centriole; (2) stabilizes astral microtubules to orient the mitotic spindle; (3) is deacetylated by HDAC6 at K98, which disrupts its interaction with γ-tubulin and its centrosomal localization; (4) is deubiquitinated by CYLD at K141/K242, enabling ENKD1-Ezrin interaction and RPE phagocytosis; (5) suppresses innate immunity by binding GGPS1 to reduce geranylgeranyl diphosphate production and inactivate RAC1; and (6) dampens antibacterial LC3-associated phagocytosis through a TRIM21-mediated K48-ubiquitination and degradation of RUBCN.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ENKD1 is a centrosome- and microtubule-associated protein that couples microtubule organization to ciliogenesis, mitotic spindle control, and innate immune regulation [#0, #1, #2]. At the mother centriole it initiates ciliogenesis by competing with CEP97 for binding to CP110, promoting CP110 removal; its loss detains CP110 and blocks cilium formation, a defect reversed by concurrent CP110 knockdown [#0]. As a microtubule-binding protein localizing to the centriole wall and ciliary axoneme, it increases tubulin polymerization and microtubule stability, regulating ciliary length and Hedgehog responsiveness [#2], and stabilizes astral microtubules through EB1 to orient the mitotic spindle, supporting asymmetric division and epidermal architecture [#1, #7]. ENKD1 activity is governed by post-translational modification: HDAC6 deacetylates it at K98 to disrupt its γ-tubulin interaction and centrosomal localization [#4], while CYLD deubiquitinates it at K141/K242 to enable an ENKD1–Ezrin interaction required for RPE phagocytosis [#3]. Beyond the cytoskeleton, ENKD1 restrains innate immunity, binding GGPS1 to lower geranylgeranyl diphosphate production and inactivate RAC1 [#5], and acting with the E3 ligase TRIM21 to drive K48-linked ubiquitination and degradation of RUBCN, thereby dampening LC3-associated phagocytosis and bacterial clearance [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2022,\n      \"claim\": \"Established ENKD1 as a centrosomal initiator of ciliogenesis acting through the CP110/CEP97 cap, answering how it controls cilium assembly.\",\n      \"evidence\": \"Co-IP, super-resolution microscopy, double-knockdown epistasis rescue and Enkd1 knockout mice\",\n      \"pmids\": [\"35301795\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of ENKD1-CP110 competition with CEP97 not resolved\", \"Whether ENKD1 acts catalytically or stoichiometrically at the centriole unclear\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined ENKD1 as a microtubule-binding protein that stabilizes astral microtubules to orient the spindle, linking it to asymmetric division and epidermal thickness.\",\n      \"evidence\": \"Microtubule co-sedimentation, domain rescue, live spindle imaging in Enkd1 knockout mice\",\n      \"pmids\": [\"35197565\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinants of microtubule binding within the domain not mapped at residue level\", \"How spindle orientation cues are transmitted to ENKD1 unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed ENKD1 directly promotes tubulin polymerization and microtubule stability at the centriole wall and axoneme, tying its MAP activity to ciliary content and Hedgehog signaling.\",\n      \"evidence\": \"In vitro tubulin polymerization, cellular stability assays, BioID proximity proteomics, Hedgehog reporter assays\",\n      \"pmids\": [\"35072334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct effectors downstream of ciliary length defects not identified\", \"Mechanism by which ENKD1 senses or regulates ciliary content unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified a CYLD-dependent deubiquitination switch (K141/K242) that licenses ENKD1-Ezrin interaction for RPE phagocytosis, revealing post-translational control of an ENKD1 function outside the cilium.\",\n      \"evidence\": \"Co-IP, ubiquitination site mapping, deubiquitinase assay, Cyld knockout mice, phagocytosis assays\",\n      \"pmids\": [\"39373352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The E3 ligase that ubiquitinates ENKD1 at K141/K242 not identified\", \"How Ezrin engagement is structurally coupled to ENKD1 deubiquitination unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined a HDAC6-mediated deacetylation event at K98 that disrupts ENKD1-γ-tubulin binding and centrosomal targeting, providing a second layer of PTM control over spindle positioning.\",\n      \"evidence\": \"Deacetylation and site-specific mutagenesis assays, Co-IP, centrosomal localization imaging, HDAC6 overexpression in mouse cornea\",\n      \"pmids\": [\"40155750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The acetyltransferase opposing HDAC6 at K98 not identified\", \"Whether acetylation state interacts with the CYLD ubiquitination switch unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Revealed an immune-suppressive role: ENKD1 binds GGPS1 to reduce geranylgeranyl diphosphate and inactivate RAC1, dampening pro-inflammatory signaling.\",\n      \"evidence\": \"Co-IP, GGPS1 enzymatic activity assays, RAC1 activation assays, TLR stimulation, ENKD1 knockout mice\",\n      \"pmids\": [\"40048432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Abstract-level detail limits full mechanistic confidence\", \"How ENKD1 modulates GGPS1 catalysis biochemically not defined\", \"Relationship between cytoskeletal and immune functions unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showed ENKD1 acts with TRIM21 to drive K48-ubiquitination and degradation of RUBCN, suppressing LC3-associated phagocytosis and bacterial clearance.\",\n      \"evidence\": \"Reciprocal Co-IP, K48-linkage ubiquitination assay, RUBCN degradation, LC3 lipidation and phagosome-lysosome fusion assays, ENKD1 knockout infection model\",\n      \"pmids\": [\"41187080\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ENKD1 is a substrate adaptor or activator of TRIM21 not resolved\", \"How this LAP role relates to ENKD1's centrosomal functions unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended the microtubule-stabilizing role to keratinocyte migration and epidermal elasticity, implicating EB1 as a functional partner.\",\n      \"evidence\": \"Enkd1 knockout mice, localization imaging, microtubule stability and migration assays, EB1 interaction studies\",\n      \"pmids\": [\"40879264\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"EB1 mechanistic link not fully elaborated\", \"Direct vs indirect ENKD1-EB1 interaction not established\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ENKD1's cytoskeletal/ciliary roles mechanistically integrate with its immune-regulatory functions, and what governs partitioning between these activities, remains unresolved.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying model linking centrosomal localization to GGPS1/TRIM21 immune signaling\", \"No structural data on ENKD1 or its binding interfaces\", \"Coordination between the K98 acetylation and K141/K242 ubiquitination switches unexplored\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 2, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [0, 4, 7]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 2, 7]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [0, 2]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 4]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"CP110\", \"CEP97\", \"GGPS1\", \"TRIM21\", \"CYLD\", \"HDAC6\", \"EZR\", \"EB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}