{"gene":"N4BP2L1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2019,"finding":"USF1 (upstream transcription factor 1) directly binds to the E-box in the N4BP2L1 promoter and induces N4BP2L1 promoter activity, establishing N4BP2L1 as a transcriptional target of USF1. N4BP2L1 knockdown significantly decreased expression of adipocyte differentiation markers, indicating a role in adipogenesis.","method":"Luciferase reporter assay, electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), siRNA knockdown with differentiation marker readout","journal":"Biochemistry and biophysics reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, luciferase reporter, KD phenotype) in a single lab","pmids":["31440585"],"is_preprint":false},{"year":2021,"finding":"N4BP2L1 is a FoxO1 target gene whose expression is regulated by insulin-mediated regulation of FoxO1. N4BP2L1 physically interacts with dynactin (which binds the microtubule motor dynein), and N4BP2L1 overexpression or knockdown modulates GLUT4 translocation and glucose uptake in 3T3-L1 adipocytes.","method":"Reporter assay (FoxO1 regulation), immunoprecipitation (N4BP2L1–dynactin interaction), GLUT4 translocation assay, glucose uptake assay with adenoviral overexpression and knockdown","journal":"Journal of diabetes investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal/immunoprecipitation for interaction, functional assays (GLUT4 translocation, glucose uptake) with gain- and loss-of-function, single lab","pmids":["34197691"],"is_preprint":false},{"year":2016,"finding":"N4BP2L1 promotes cancer cell invasion in oral squamous cell carcinoma; knockdown of N4BP2L1 significantly reduced invasive potential. N4BP2L1 expression is regulated by miR-448 (inverse correlation), placing it downstream of miR-448 in a regulatory axis.","method":"siRNA knockdown with invasion assay, cDNA microarray, miR-448 overexpression with N4BP2L1 expression readout","journal":"Virchows Archiv : an international journal of pathology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — knockdown with invasion phenotype and miRNA regulation shown, single lab with multiple methods","pmids":["27184799"],"is_preprint":false},{"year":2024,"finding":"N4BP2L1 is a direct target of miR-150-5p in bladder cancer cells. N4BP2L1 knockdown mimicked miR-150-5p inhibitory effects on cell proliferation, migration, and G0/G1 arrest, while N4BP2L1 overexpression reversed these effects and restored CDK4, Cyclin D1, Bcl-2, PCNA, Ki-67, N-cadherin, Bad, and E-cadherin levels.","method":"Luciferase reporter assay (direct miR-150-5p targeting), siRNA knockdown, overexpression, western blot for downstream effectors, cell proliferation and migration assays","journal":"Journal of physiological investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — luciferase reporter for direct miRNA targeting validated, gain- and loss-of-function with multiple downstream readouts, single lab","pmids":["38910572"],"is_preprint":false},{"year":2024,"finding":"N4BP2L1 physically binds to the C-terminal domain of MT5-MMP (membrane-type 5 matrix metalloproteinase), and this interaction significantly increases MT5-MMP η-secretase activity (sAPPη production), facilitating cleavage of amyloid precursor protein (APP). This was identified via yeast two-hybrid screen using the MT5-MMP C-terminal domain as bait in a human brain cDNA library.","method":"Yeast two-hybrid screen, MT5-MMP fusion protein localization constructs, sAPPη production assay","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid interaction with functional consequence (increased sAPPη), single lab with binding and activity readout","pmids":["38345408"],"is_preprint":false}],"current_model":"N4BP2L1 is a transcriptionally regulated protein (controlled by USF1 via E-box binding and by insulin/FoxO1 signaling) that interacts with the dynactin complex to facilitate GLUT4 trafficking and glucose uptake in adipocytes, promotes tumor cell invasion downstream of miR-448 and miR-150-5p regulatory axes, and binds the C-terminal domain of MT5-MMP to potentiate its η-secretase cleavage of amyloid precursor protein."},"narrative":{"mechanistic_narrative":"N4BP2L1 is a transcriptionally regulated adaptor protein implicated in adipocyte glucose handling, tumor cell invasion, and modulation of membrane-type matrix metalloproteinase activity [PMID:34197691, PMID:27184799, PMID:38345408]. Its expression is controlled at the promoter level by USF1, which binds an E-box in the N4BP2L1 promoter to drive transcription, and N4BP2L1 knockdown impairs adipocyte differentiation [PMID:31440585]. In adipocytes it is additionally a FoxO1 target subject to insulin-mediated regulation, and it physically associates with the dynactin complex to modulate GLUT4 translocation and glucose uptake, linking it to microtubule motor-dependent vesicle trafficking [PMID:34197691]. In cancer contexts N4BP2L1 acts as a pro-invasive and pro-proliferative effector situated downstream of inhibitory microRNAs: it is repressed by miR-448 in oral squamous cell carcinoma, where its knockdown reduces invasion [PMID:27184799], and is a direct miR-150-5p target in bladder cancer, where it sustains proliferation and migration through effectors including CDK4, Cyclin D1, and the EMT markers N-cadherin and E-cadherin [PMID:38910572]. N4BP2L1 also binds the C-terminal domain of MT5-MMP and potentiates its η-secretase cleavage of amyloid precursor protein [PMID:38345408]. Beyond these interaction- and phenotype-level findings, no catalytic activity or structural mechanism for N4BP2L1 has been characterized in the available corpus.","teleology":[{"year":2016,"claim":"Established the first functional role for N4BP2L1, placing it downstream of a microRNA regulatory axis as a driver of tumor cell invasion.","evidence":"siRNA knockdown with invasion assay, cDNA microarray, and miR-448 overexpression in oral squamous cell carcinoma","pmids":["27184799"],"confidence":"Medium","gaps":["No molecular mechanism connecting N4BP2L1 to the invasion machinery","Direct miR-448 targeting of the N4BP2L1 transcript not demonstrated (inverse correlation only)"]},{"year":2019,"claim":"Identified an upstream transcriptional control mechanism for N4BP2L1 and a role in adipogenesis, answering how the gene is regulated.","evidence":"Luciferase reporter, EMSA, ChIP showing USF1 binding the N4BP2L1 promoter E-box, plus siRNA knockdown with adipocyte differentiation marker readout","pmids":["31440585"],"confidence":"Medium","gaps":["Mechanism by which N4BP2L1 promotes differentiation not defined","No downstream effector or interaction partner identified in this study"]},{"year":2021,"claim":"Connected N4BP2L1 to insulin/FoxO1 signaling and to dynactin-dependent vesicle trafficking, providing the first physical interaction partner and a mechanistic link to glucose metabolism.","evidence":"Reporter assay for FoxO1 regulation, immunoprecipitation of N4BP2L1–dynactin, GLUT4 translocation and glucose uptake assays with adenoviral gain- and loss-of-function in 3T3-L1 adipocytes","pmids":["34197691"],"confidence":"Medium","gaps":["Which dynactin subunit N4BP2L1 contacts is not resolved","Whether N4BP2L1 directly bridges GLUT4 vesicles to the dynein/dynactin motor is not shown","Single lab, no reciprocal/structural validation of the interaction"]},{"year":2024,"claim":"Defined a direct physical interaction with MT5-MMP and a functional consequence (enhanced η-secretase APP cleavage), extending N4BP2L1 function to proteolytic processing.","evidence":"Yeast two-hybrid screen with MT5-MMP C-terminal domain bait against a human brain cDNA library, plus sAPPη production assay","pmids":["38345408"],"confidence":"Medium","gaps":["Interaction shown by Y2H and activity readout but not confirmed in a structural or endogenous setting","How N4BP2L1 binding potentiates MT5-MMP activity mechanistically is unknown","Physiological relevance to APP processing in vivo not established"]},{"year":2024,"claim":"Confirmed N4BP2L1 as a direct miRNA target controlling proliferation and migration, generalizing its pro-tumor role across cancer types.","evidence":"Luciferase reporter for direct miR-150-5p targeting, siRNA knockdown and overexpression, western blot for CDK4/Cyclin D1/Bcl-2/PCNA/Ki-67/cadherins, proliferation and migration assays in bladder cancer cells","pmids":["38910572"],"confidence":"Medium","gaps":["How N4BP2L1 mechanistically regulates the cell-cycle and EMT effectors is not defined","Whether the cancer and adipocyte functions share a common molecular mechanism is unknown"]},{"year":null,"claim":"The biochemical activity of N4BP2L1 — whether it is a scaffold, adaptor, or carries enzymatic function — remains undefined, as does the structural basis for its diverse interactions with dynactin and MT5-MMP.","evidence":"No discovery in the corpus assigns a catalytic activity or resolves a structure","pmids":[],"confidence":"Low","gaps":["No defined molecular activity","No structural model","No unifying mechanism linking adipocyte, cancer, and APP-processing roles"]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["DCTN1","MT5-MMP","USF1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q5TBK1","full_name":"NEDD4-binding protein 2-like 1","aliases":[],"length_aa":243,"mass_kda":29.0,"function":"Might play a role in adipocyte differentiation and triglyceride accumulation","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/Q5TBK1/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/N4BP2L1","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/N4BP2L1","total_profiled":1310},"omim":[{"mim_id":"621053","title":"NEDD4-BINDING PROTEIN 2-LIKE 1; N4BP2L1","url":"https://www.omim.org/entry/621053"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/N4BP2L1"},"hgnc":{"alias_symbol":["CG018"],"prev_symbol":[]},"alphafold":{"accession":"Q5TBK1","domains":[{"cath_id":"3.40.50.300","chopping":"42-190","consensus_level":"high","plddt":96.742,"start":42,"end":190}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5TBK1","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q5TBK1-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q5TBK1-F1-predicted_aligned_error_v6.png","plddt_mean":78.19},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=N4BP2L1","jax_strain_url":"https://www.jax.org/strain/search?query=N4BP2L1"},"sequence":{"accession":"Q5TBK1","fasta_url":"https://rest.uniprot.org/uniprotkb/Q5TBK1.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q5TBK1/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q5TBK1"}},"corpus_meta":[{"pmid":"34234395","id":"PMC_34234395","title":"Identification of marker genes in Alzheimer's disease using a machine-learning model.","date":"2021","source":"Bioinformation","url":"https://pubmed.ncbi.nlm.nih.gov/34234395","citation_count":22,"is_preprint":false},{"pmid":"27184799","id":"PMC_27184799","title":"NEDD 4 binding protein 2-like 1 promotes cancer cell invasion in oral squamous cell carcinoma.","date":"2016","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/27184799","citation_count":22,"is_preprint":false},{"pmid":"34328786","id":"PMC_34328786","title":"MicroRNA Regulation of Bone Marrow Mesenchymal Stem Cell Chondrogenesis: Toward Articular Cartilage.","date":"2021","source":"Tissue engineering. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/34328786","citation_count":15,"is_preprint":false},{"pmid":"31440585","id":"PMC_31440585","title":"A novel upstream transcription factor 1 target gene N4bp2l1 that regulates adipogenesis.","date":"2019","source":"Biochemistry and biophysics reports","url":"https://pubmed.ncbi.nlm.nih.gov/31440585","citation_count":10,"is_preprint":false},{"pmid":"34197691","id":"PMC_34197691","title":"N4BP2L1 interacts with dynactin and contributes to GLUT4 trafficking and glucose uptake in adipocytes.","date":"2021","source":"Journal of diabetes investigation","url":"https://pubmed.ncbi.nlm.nih.gov/34197691","citation_count":9,"is_preprint":false},{"pmid":"37809963","id":"PMC_37809963","title":"A seven-immune-genes risk model predicts the survival and suitable treatments for patients with skin cutaneous melanoma.","date":"2023","source":"Heliyon","url":"https://pubmed.ncbi.nlm.nih.gov/37809963","citation_count":4,"is_preprint":false},{"pmid":"38910572","id":"PMC_38910572","title":"MicroRNA-150-5p-mediated Inhibition of Cell Proliferation, G1/S Transition, and Migration in Bladder Cancer through Targeting NEDD4-binding Protein 2-like 1 Gene.","date":"2024","source":"Journal of physiological investigation","url":"https://pubmed.ncbi.nlm.nih.gov/38910572","citation_count":3,"is_preprint":false},{"pmid":"39669749","id":"PMC_39669749","title":"Shared and specific competing endogenous RNAs network mining in four digestive system tumors.","date":"2024","source":"Computational and structural biotechnology journal","url":"https://pubmed.ncbi.nlm.nih.gov/39669749","citation_count":2,"is_preprint":false},{"pmid":"40867559","id":"PMC_40867559","title":"Membrane-Type 5 Matrix Metalloproteinase (MT5-MMP): Background and Proposed Roles in Normal Physiology and Disease.","date":"2025","source":"Biomolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40867559","citation_count":1,"is_preprint":false},{"pmid":"40790330","id":"PMC_40790330","title":"Long-read sequencing uncovers key regulatory genes involved in the differentiation of preadipocytes of Chinese red steppe cattle.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/40790330","citation_count":1,"is_preprint":false},{"pmid":"38345408","id":"PMC_38345408","title":"Identification of binding partners that facilitate membrane-type 5 matrix metalloproteinase (MT5-MMP) processing of amyloid precursor protein.","date":"2024","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/38345408","citation_count":1,"is_preprint":false},{"pmid":"38859961","id":"PMC_38859961","title":"Involvement of N4BP2L1, PLEKHA4, and BEGAIN genes in breast cancer and muscle cell development.","date":"2024","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/38859961","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8472,"output_tokens":1417,"usd":0.023335,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8131,"output_tokens":2198,"usd":0.047802,"stage2_stop_reason":"end_turn"},"total_usd":0.071137,"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\": 2019,\n      \"finding\": \"USF1 (upstream transcription factor 1) directly binds to the E-box in the N4BP2L1 promoter and induces N4BP2L1 promoter activity, establishing N4BP2L1 as a transcriptional target of USF1. N4BP2L1 knockdown significantly decreased expression of adipocyte differentiation markers, indicating a role in adipogenesis.\",\n      \"method\": \"Luciferase reporter assay, electrophoretic mobility shift assay (EMSA), chromatin immunoprecipitation (ChIP), siRNA knockdown with differentiation marker readout\",\n      \"journal\": \"Biochemistry and biophysics reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, luciferase reporter, KD phenotype) in a single lab\",\n      \"pmids\": [\"31440585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"N4BP2L1 is a FoxO1 target gene whose expression is regulated by insulin-mediated regulation of FoxO1. N4BP2L1 physically interacts with dynactin (which binds the microtubule motor dynein), and N4BP2L1 overexpression or knockdown modulates GLUT4 translocation and glucose uptake in 3T3-L1 adipocytes.\",\n      \"method\": \"Reporter assay (FoxO1 regulation), immunoprecipitation (N4BP2L1–dynactin interaction), GLUT4 translocation assay, glucose uptake assay with adenoviral overexpression and knockdown\",\n      \"journal\": \"Journal of diabetes investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal/immunoprecipitation for interaction, functional assays (GLUT4 translocation, glucose uptake) with gain- and loss-of-function, single lab\",\n      \"pmids\": [\"34197691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"N4BP2L1 promotes cancer cell invasion in oral squamous cell carcinoma; knockdown of N4BP2L1 significantly reduced invasive potential. N4BP2L1 expression is regulated by miR-448 (inverse correlation), placing it downstream of miR-448 in a regulatory axis.\",\n      \"method\": \"siRNA knockdown with invasion assay, cDNA microarray, miR-448 overexpression with N4BP2L1 expression readout\",\n      \"journal\": \"Virchows Archiv : an international journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — knockdown with invasion phenotype and miRNA regulation shown, single lab with multiple methods\",\n      \"pmids\": [\"27184799\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"N4BP2L1 is a direct target of miR-150-5p in bladder cancer cells. N4BP2L1 knockdown mimicked miR-150-5p inhibitory effects on cell proliferation, migration, and G0/G1 arrest, while N4BP2L1 overexpression reversed these effects and restored CDK4, Cyclin D1, Bcl-2, PCNA, Ki-67, N-cadherin, Bad, and E-cadherin levels.\",\n      \"method\": \"Luciferase reporter assay (direct miR-150-5p targeting), siRNA knockdown, overexpression, western blot for downstream effectors, cell proliferation and migration assays\",\n      \"journal\": \"Journal of physiological investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — luciferase reporter for direct miRNA targeting validated, gain- and loss-of-function with multiple downstream readouts, single lab\",\n      \"pmids\": [\"38910572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"N4BP2L1 physically binds to the C-terminal domain of MT5-MMP (membrane-type 5 matrix metalloproteinase), and this interaction significantly increases MT5-MMP η-secretase activity (sAPPη production), facilitating cleavage of amyloid precursor protein (APP). This was identified via yeast two-hybrid screen using the MT5-MMP C-terminal domain as bait in a human brain cDNA library.\",\n      \"method\": \"Yeast two-hybrid screen, MT5-MMP fusion protein localization constructs, sAPPη production assay\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid interaction with functional consequence (increased sAPPη), single lab with binding and activity readout\",\n      \"pmids\": [\"38345408\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"N4BP2L1 is a transcriptionally regulated protein (controlled by USF1 via E-box binding and by insulin/FoxO1 signaling) that interacts with the dynactin complex to facilitate GLUT4 trafficking and glucose uptake in adipocytes, promotes tumor cell invasion downstream of miR-448 and miR-150-5p regulatory axes, and binds the C-terminal domain of MT5-MMP to potentiate its η-secretase cleavage of amyloid precursor protein.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"N4BP2L1 is a transcriptionally regulated adaptor protein implicated in adipocyte glucose handling, tumor cell invasion, and modulation of membrane-type matrix metalloproteinase activity [#1, #2, #4]. Its expression is controlled at the promoter level by USF1, which binds an E-box in the N4BP2L1 promoter to drive transcription, and N4BP2L1 knockdown impairs adipocyte differentiation [#0]. In adipocytes it is additionally a FoxO1 target subject to insulin-mediated regulation, and it physically associates with the dynactin complex to modulate GLUT4 translocation and glucose uptake, linking it to microtubule motor-dependent vesicle trafficking [#1]. In cancer contexts N4BP2L1 acts as a pro-invasive and pro-proliferative effector situated downstream of inhibitory microRNAs: it is repressed by miR-448 in oral squamous cell carcinoma, where its knockdown reduces invasion [#2], and is a direct miR-150-5p target in bladder cancer, where it sustains proliferation and migration through effectors including CDK4, Cyclin D1, and the EMT markers N-cadherin and E-cadherin [#3]. N4BP2L1 also binds the C-terminal domain of MT5-MMP and potentiates its η-secretase cleavage of amyloid precursor protein [#4]. Beyond these interaction- and phenotype-level findings, no catalytic activity or structural mechanism for N4BP2L1 has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2016,\n      \"claim\": \"Established the first functional role for N4BP2L1, placing it downstream of a microRNA regulatory axis as a driver of tumor cell invasion.\",\n      \"evidence\": \"siRNA knockdown with invasion assay, cDNA microarray, and miR-448 overexpression in oral squamous cell carcinoma\",\n      \"pmids\": [\"27184799\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism connecting N4BP2L1 to the invasion machinery\", \"Direct miR-448 targeting of the N4BP2L1 transcript not demonstrated (inverse correlation only)\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an upstream transcriptional control mechanism for N4BP2L1 and a role in adipogenesis, answering how the gene is regulated.\",\n      \"evidence\": \"Luciferase reporter, EMSA, ChIP showing USF1 binding the N4BP2L1 promoter E-box, plus siRNA knockdown with adipocyte differentiation marker readout\",\n      \"pmids\": [\"31440585\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which N4BP2L1 promotes differentiation not defined\", \"No downstream effector or interaction partner identified in this study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected N4BP2L1 to insulin/FoxO1 signaling and to dynactin-dependent vesicle trafficking, providing the first physical interaction partner and a mechanistic link to glucose metabolism.\",\n      \"evidence\": \"Reporter assay for FoxO1 regulation, immunoprecipitation of N4BP2L1–dynactin, GLUT4 translocation and glucose uptake assays with adenoviral gain- and loss-of-function in 3T3-L1 adipocytes\",\n      \"pmids\": [\"34197691\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which dynactin subunit N4BP2L1 contacts is not resolved\", \"Whether N4BP2L1 directly bridges GLUT4 vesicles to the dynein/dynactin motor is not shown\", \"Single lab, no reciprocal/structural validation of the interaction\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Defined a direct physical interaction with MT5-MMP and a functional consequence (enhanced η-secretase APP cleavage), extending N4BP2L1 function to proteolytic processing.\",\n      \"evidence\": \"Yeast two-hybrid screen with MT5-MMP C-terminal domain bait against a human brain cDNA library, plus sAPP\\u03b7 production assay\",\n      \"pmids\": [\"38345408\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Interaction shown by Y2H and activity readout but not confirmed in a structural or endogenous setting\", \"How N4BP2L1 binding potentiates MT5-MMP activity mechanistically is unknown\", \"Physiological relevance to APP processing in vivo not established\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Confirmed N4BP2L1 as a direct miRNA target controlling proliferation and migration, generalizing its pro-tumor role across cancer types.\",\n      \"evidence\": \"Luciferase reporter for direct miR-150-5p targeting, siRNA knockdown and overexpression, western blot for CDK4/Cyclin D1/Bcl-2/PCNA/Ki-67/cadherins, proliferation and migration assays in bladder cancer cells\",\n      \"pmids\": [\"38910572\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How N4BP2L1 mechanistically regulates the cell-cycle and EMT effectors is not defined\", \"Whether the cancer and adipocyte functions share a common molecular mechanism is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical activity of N4BP2L1 — whether it is a scaffold, adaptor, or carries enzymatic function — remains undefined, as does the structural basis for its diverse interactions with dynactin and MT5-MMP.\",\n      \"evidence\": \"No discovery in the corpus assigns a catalytic activity or resolves a structure\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No defined molecular activity\", \"No structural model\", \"No unifying mechanism linking adipocyte, cancer, and APP-processing roles\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"DCTN1\", \"MT5-MMP\", \"USF1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}