{"gene":"STRADB","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2003,"finding":"STRADB (referred to as PAPK) forms a complex with LKB1 (Par-4) and Mo25, and this complex formation results in translocation of LKB1 from the nucleus to the cytoplasm and to tight junctions; the LKB1 complex may activate MARK kinases.","method":"Tandem affinity purification (TAP) of protein complexes from cultured cells followed by tandem mass spectrometry; translocation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — TAP-MS proteomics with functional translocation readout, single lab, two orthogonal methods (complex mapping + localization)","pmids":["14676191"],"is_preprint":false},{"year":2002,"finding":"STRADB (ILPIP/ILPIPA) interacts with XIAP (identified by yeast two-hybrid), and co-precipitates with both TAK1 and TRAF6 in vivo. STRADB moderately activates JNK family members alone and strongly enhances XIAP-mediated activation of JNK1, JNK2, and JNK3 through a TAK1-dependent pathway. STRADB also moderately protects against ICE- or Fas-induced apoptosis and potentiates XIAP anti-apoptotic activity without affecting XIAP-mediated caspase inhibition.","method":"Yeast two-hybrid screening; co-immunoprecipitation; JNK activation reporter assays; dominant-negative TAK1 epistasis; apoptosis assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP plus functional epistasis (dominant-negative TAK1), single lab, multiple orthogonal methods","pmids":["12048196"],"is_preprint":false},{"year":2003,"finding":"STRADB (PAPK) is a novel Ste20/germinal center kinase (GCK)-related kinase that is activated by hydrogen peroxide in vitro. PAPK-A (418 aa) expression increases after growth factor withdrawal in hematopoietic and fibroblast cells. PAPK activates JNK1 and ERK6/p38γ; kinase activity is required for ERK6/p38γ activation but not JNK1 activation. Expression of kinase-active PAPK-A in NIH3T3 cells induces cytoskeletal changes and resistance to apoptosis induced by serum withdrawal, effects requiring kinase activity.","method":"In vitro kinase assay; inducible stable transfection; cytoskeletal imaging; apoptosis assay with kinase-dead mutant","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus active-site mutagenesis plus cellular phenotypic rescue, single lab with multiple orthogonal methods","pmids":["12574163"],"is_preprint":false}],"current_model":"STRADB (PAPK/ILPIP) is a Ste20/germinal center kinase-related pseudokinase/kinase that forms a complex with LKB1 and Mo25 to promote LKB1 cytoplasmic/tight junction localization, activates downstream stress kinases JNK1 and ERK6/p38γ, interacts with XIAP and TAK1/TRAF6 to enhance JNK-mediated anti-apoptotic signaling, and promotes cytoskeletal reorganization and cell survival in response to stress."},"narrative":{"mechanistic_narrative":"STRADB (PAPK/ILPIP) is a Ste20/germinal center kinase (GCK)-related kinase that couples stress signaling to cytoskeletal remodeling and cell survival [PMID:12574163]. It forms a complex with LKB1 (Par-4) and Mo25, driving relocalization of LKB1 from the nucleus to the cytoplasm and tight junctions [PMID:14676191]. STRADB is activated by hydrogen peroxide and its expression rises following growth factor withdrawal, after which it activates the stress kinases JNK1 and ERK6/p38γ; its catalytic activity is required for ERK6/p38γ activation but dispensable for JNK1 activation [PMID:12574163]. Independently, STRADB interacts with XIAP and co-precipitates with TAK1 and TRAF6, strongly enhancing XIAP-mediated activation of JNK1/2/3 through a TAK1-dependent pathway and potentiating XIAP anti-apoptotic activity without altering caspase inhibition [PMID:12048196]. Consistent with these signaling outputs, kinase-active STRADB induces cytoskeletal changes and confers resistance to apoptosis triggered by serum withdrawal [PMID:12574163].","teleology":[{"year":2002,"claim":"Established STRADB as a pro-survival adaptor by linking it physically and functionally to the XIAP–TAK1–TRAF6 anti-apoptotic axis, answering how it might bias cells toward survival.","evidence":"Yeast two-hybrid, reciprocal co-immunoprecipitation, JNK reporter assays, dominant-negative TAK1 epistasis, and apoptosis assays in cultured cells","pmids":["12048196"],"confidence":"Medium","gaps":["Does not define the direct binding interface or whether STRADB's catalytic activity is required for XIAP/TAK1-mediated JNK activation","In vivo physiological relevance of the XIAP–STRADB interaction not established","Mechanism by which it potentiates XIAP without altering caspase inhibition unresolved"]},{"year":2003,"claim":"Defined STRADB as a GCK-related kinase activated by oxidative stress and induced upon growth factor withdrawal, connecting its catalytic activity to stress-kinase signaling and survival phenotypes.","evidence":"In vitro kinase assay with H2O2 stimulation, inducible stable transfection, kinase-dead mutagenesis, cytoskeletal imaging, and apoptosis assays in NIH3T3/hematopoietic cells","pmids":["12574163"],"confidence":"High","gaps":["Direct physiological substrates of STRADB kinase activity not identified","Why ERK6/p38γ activation requires kinase activity but JNK1 activation does not is unexplained","Molecular link between cytoskeletal remodeling and apoptosis resistance not defined"]},{"year":2003,"claim":"Placed STRADB within the LKB1–Mo25 complex and showed it controls LKB1 subcellular localization, implicating it in spatial regulation of LKB1 signaling.","evidence":"Tandem affinity purification with mass spectrometry and LKB1 translocation assays in cultured cells","pmids":["14676191"],"confidence":"Medium","gaps":["Whether STRADB-driven LKB1 relocalization activates MARK kinases not directly demonstrated","How LKB1/Mo25 binding relates to STRADB's XIAP/TAK1 and stress-kinase functions unclear","Stoichiometry and architecture of the STRADB–LKB1–Mo25 complex not resolved"]},{"year":null,"claim":"How STRADB integrates its LKB1/Mo25 scaffolding role with its XIAP–TAK1 anti-apoptotic and stress-kinase functions, and the identity of its physiological substrates, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No direct kinase substrate identified","No structural model of the STRADB–LKB1–Mo25 complex","Whether the LKB1-scaffolding and XIAP/JNK functions occur in the same cells or pathways is unknown"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[2]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,2]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[1,2]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,2]}],"complexes":["LKB1-STRAD-Mo25 complex"],"partners":["STK11","CAB39","XIAP","MAP3K7","TRAF6"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9C0K7","full_name":"STE20-related kinase adapter protein beta","aliases":["Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 2 protein","CALS-21","ILP-interacting protein","Pseudokinase ALS2CR2"],"length_aa":418,"mass_kda":47.0,"function":"Pseudokinase which, in complex with CAB39/MO25 (CAB39/MO25alpha or CAB39L/MO25beta), binds to and activates STK11/LKB1. Adopts a closed conformation typical of active protein kinases and binds STK11/LKB1 as a pseudosubstrate, promoting conformational change of STK11/LKB1 in an active conformation (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9C0K7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/STRADB","classification":"Not Classified","n_dependent_lines":8,"n_total_lines":1208,"dependency_fraction":0.006622516556291391},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"STK11","stoichiometry":4.0}],"url":"https://opencell.sf.czbiohub.org/search/STRADB","total_profiled":1310},"omim":[{"mim_id":"607333","title":"STE20-RELATED KINASE ADAPTOR BETA; STRADB","url":"https://www.omim.org/entry/607333"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"},{"location":"Primary cilium","reliability":"Additional"},{"location":"Primary cilium tip","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/STRADB"},"hgnc":{"alias_symbol":["STLK6","CALS-21","PAPK","ILPIPA","ILPIP"],"prev_symbol":["ALS2CR2"]},"alphafold":{"accession":"Q9C0K7","domains":[{"cath_id":"3.30.200.20","chopping":"56-138","consensus_level":"high","plddt":94.1592,"start":56,"end":138},{"cath_id":"1.10.510.10","chopping":"143-291_337-383","consensus_level":"high","plddt":91.0367,"start":143,"end":383}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0K7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0K7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9C0K7-F1-predicted_aligned_error_v6.png","plddt_mean":74.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=STRADB","jax_strain_url":"https://www.jax.org/strain/search?query=STRADB"},"sequence":{"accession":"Q9C0K7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9C0K7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9C0K7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9C0K7"}},"corpus_meta":[{"pmid":"10446050","id":"PMC_10446050","title":"Structural basis of chaperone function and pilus biogenesis.","date":"1999","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/10446050","citation_count":332,"is_preprint":false},{"pmid":"8097321","id":"PMC_8097321","title":"Outer-membrane PapC molecular usher discriminately recognizes periplasmic chaperone-pilus subunit complexes.","date":"1993","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/8097321","citation_count":170,"is_preprint":false},{"pmid":"7816100","id":"PMC_7816100","title":"Structural polymorphism of bacterial adhesion pili.","date":"1995","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/7816100","citation_count":155,"is_preprint":false},{"pmid":"14676191","id":"PMC_14676191","title":"Comprehensive proteomic analysis of human Par protein complexes reveals an interconnected protein network.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14676191","citation_count":152,"is_preprint":false},{"pmid":"8482368","id":"PMC_8482368","title":"Identification of mitogen-activated protein kinase phosphorylation sequences in mammalian h-Caldesmon.","date":"1993","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/8482368","citation_count":138,"is_preprint":false},{"pmid":"8096174","id":"PMC_8096174","title":"Initiation of assembly and association of the structural elements of a bacterial pilus depend on two specialized tip proteins.","date":"1993","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/8096174","citation_count":109,"is_preprint":false},{"pmid":"1601129","id":"PMC_1601129","title":"Phosphorylation sequences in h-caldesmon from phorbol ester-stimulated canine aortas.","date":"1992","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/1601129","citation_count":85,"is_preprint":false},{"pmid":"12048196","id":"PMC_12048196","title":"ILPIP, a novel anti-apoptotic protein that enhances XIAP-mediated activation of JNK1 and protection against apoptosis.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12048196","citation_count":47,"is_preprint":false},{"pmid":"31882666","id":"PMC_31882666","title":"Down-regulation of long non-coding RNA HOTAIR sensitizes breast cancer to trastuzumab.","date":"2019","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/31882666","citation_count":35,"is_preprint":false},{"pmid":"28910321","id":"PMC_28910321","title":"Identification of transforming growth factor-beta-regulated microRNAs and the microRNA-targetomes in primary lung fibroblasts.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28910321","citation_count":32,"is_preprint":false},{"pmid":"7909317","id":"PMC_7909317","title":"Stable fiber-forming and nonfiber-forming chaperone-subunit complexes in pilus biogenesis.","date":"1994","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7909317","citation_count":32,"is_preprint":false},{"pmid":"11123684","id":"PMC_11123684","title":"An extended hydrophobic interactive surface of Yersinia pestis Caf1M chaperone is essential for subunit binding and F1 capsule assembly.","date":"2001","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/11123684","citation_count":32,"is_preprint":false},{"pmid":"32742494","id":"PMC_32742494","title":"DGCR5 Promotes Gallbladder Cancer by Sponging MiR-3619-5p via MEK/ERK1/2 and JNK/p38 MAPK Pathways.","date":"2020","source":"Journal of Cancer","url":"https://pubmed.ncbi.nlm.nih.gov/32742494","citation_count":26,"is_preprint":false},{"pmid":"16870225","id":"PMC_16870225","title":"C-terminal repetitive motifs in Vp130 present at the unique vertex of the Chlorovirus capsid are essential for binding to the host Chlorella cell wall.","date":"2006","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/16870225","citation_count":20,"is_preprint":false},{"pmid":"29311920","id":"PMC_29311920","title":"Modulation of miR-26a-5p and miR-15b-5p Exosomal Expression Associated with Clopidogrel-Induced Hepatotoxicity in HepG2 Cells.","date":"2017","source":"Frontiers in pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/29311920","citation_count":17,"is_preprint":false},{"pmid":"12574163","id":"PMC_12574163","title":"Identification and characterization of a novel Ste20/germinal center kinase-related kinase, polyploidy-associated protein kinase.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12574163","citation_count":16,"is_preprint":false},{"pmid":"17306829","id":"PMC_17306829","title":"A molecular dynamics study of pilus subunits: insights into pilus biogenesis.","date":"2007","source":"Journal of molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/17306829","citation_count":16,"is_preprint":false},{"pmid":"23879743","id":"PMC_23879743","title":"3-Phosphoglycerate is an allosteric activator of pyruvate kinase from the hyperthermophilic archaeon Pyrobaculum aerophilum.","date":"2013","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23879743","citation_count":13,"is_preprint":false},{"pmid":"10760135","id":"PMC_10760135","title":"Evidence for donor strand complementation in the biogenesis of Haemophilus influenzae haemagglutinating pili.","date":"2000","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/10760135","citation_count":13,"is_preprint":false},{"pmid":"14967489","id":"PMC_14967489","title":"Vp130, a chloroviral surface protein that interacts with the host Chlorella cell wall.","date":"2004","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/14967489","citation_count":13,"is_preprint":false},{"pmid":"11599886","id":"PMC_11599886","title":"Fas-independent apoptosis induced by UVC in p53-mutated human epithelial tumor A431 cells through activation of caspase-8 and JNK/SAPK.","date":"2001","source":"Journal of radiation research","url":"https://pubmed.ncbi.nlm.nih.gov/11599886","citation_count":11,"is_preprint":false},{"pmid":"18370285","id":"PMC_18370285","title":"Phosphorylation of movement proteins by the plasmodesmal-associated protein kinase.","date":"2008","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/18370285","citation_count":8,"is_preprint":false},{"pmid":"37105909","id":"PMC_37105909","title":"A Core Genome Multilocus Sequence Typing Scheme for Proteus mirabilis.","date":"2023","source":"Biomedical and environmental sciences : BES","url":"https://pubmed.ncbi.nlm.nih.gov/37105909","citation_count":7,"is_preprint":false},{"pmid":"36308567","id":"PMC_36308567","title":"Investigation of cytotoxic and apoptotic effects of disodium pentaborate decahydrate on ovarian cancer cells and assessment of gene profiling.","date":"2022","source":"Medical oncology (Northwood, London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/36308567","citation_count":6,"is_preprint":false},{"pmid":"35648061","id":"PMC_35648061","title":"Genome-Wide mRNA Expression Analysis of Acute Psychological Stress Responses.","date":"2022","source":"MEDICC review","url":"https://pubmed.ncbi.nlm.nih.gov/35648061","citation_count":2,"is_preprint":false},{"pmid":"41968426","id":"PMC_41968426","title":"Causal links of 233 metabolic markers to benign prostatic hyperplasia: Mendelian randomization and RNA-sequencing insights.","date":"2026","source":"Journal of the Chinese Medical Association : JCMA","url":"https://pubmed.ncbi.nlm.nih.gov/41968426","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14796,"output_tokens":1385,"usd":0.032581,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7479,"output_tokens":1956,"usd":0.043147,"stage2_stop_reason":"end_turn"},"total_usd":0.075728,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify which papers are about the canonical STRADB protein (also known as STLK6, CALS-21, PAPK, ILPIPA, ILPIP, ALS2CR2).\n\nKey observations:\n- Papers [1], [2], [3], [6], [11], [12], [17], [19] are about bacterial P pili proteins (PapK, PapD, etc.) - these are bacterial proteins, NOT the human STRADB gene. \"PAPK\" here is the bacterial pilus assembly protein, a clear symbol collision.\n- Paper [4] (PMID:14676191) mentions \"PAPK\" as an alias in the context of LKB1 complexes - this IS about STRADB (referred to as PAPK in the Par protein complex context).\n- Paper [8] (PMID:12048196) is about ILPIP (ILPIPA alias) - this IS STRADB.\n- Paper [16] (PMID:12574163) describes PAPK as a Ste20/GCK-related kinase - this IS STRADB.\n- Papers [5], [7] are about h-Caldesmon phosphorylation sites containing \"PAPK\" peptide sequences - these are NOT about the STRADB gene.\n- Papers [13], [14], [20], [22] involve other \"PAPK\" entities (lncRNA, chlorovirus protein, plant kinase) - NOT STRADB.\n- Papers [9], [10], [15], [18], [21], [23], [24], [25], [26] - mostly expression studies or irrelevant.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"STRADB (referred to as PAPK) forms a complex with LKB1 (Par-4) and Mo25, and this complex formation results in translocation of LKB1 from the nucleus to the cytoplasm and to tight junctions; the LKB1 complex may activate MARK kinases.\",\n      \"method\": \"Tandem affinity purification (TAP) of protein complexes from cultured cells followed by tandem mass spectrometry; translocation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — TAP-MS proteomics with functional translocation readout, single lab, two orthogonal methods (complex mapping + localization)\",\n      \"pmids\": [\"14676191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"STRADB (ILPIP/ILPIPA) interacts with XIAP (identified by yeast two-hybrid), and co-precipitates with both TAK1 and TRAF6 in vivo. STRADB moderately activates JNK family members alone and strongly enhances XIAP-mediated activation of JNK1, JNK2, and JNK3 through a TAK1-dependent pathway. STRADB also moderately protects against ICE- or Fas-induced apoptosis and potentiates XIAP anti-apoptotic activity without affecting XIAP-mediated caspase inhibition.\",\n      \"method\": \"Yeast two-hybrid screening; co-immunoprecipitation; JNK activation reporter assays; dominant-negative TAK1 epistasis; apoptosis assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP plus functional epistasis (dominant-negative TAK1), single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12048196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"STRADB (PAPK) is a novel Ste20/germinal center kinase (GCK)-related kinase that is activated by hydrogen peroxide in vitro. PAPK-A (418 aa) expression increases after growth factor withdrawal in hematopoietic and fibroblast cells. PAPK activates JNK1 and ERK6/p38γ; kinase activity is required for ERK6/p38γ activation but not JNK1 activation. Expression of kinase-active PAPK-A in NIH3T3 cells induces cytoskeletal changes and resistance to apoptosis induced by serum withdrawal, effects requiring kinase activity.\",\n      \"method\": \"In vitro kinase assay; inducible stable transfection; cytoskeletal imaging; apoptosis assay with kinase-dead mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus active-site mutagenesis plus cellular phenotypic rescue, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"12574163\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"STRADB (PAPK/ILPIP) is a Ste20/germinal center kinase-related pseudokinase/kinase that forms a complex with LKB1 and Mo25 to promote LKB1 cytoplasmic/tight junction localization, activates downstream stress kinases JNK1 and ERK6/p38γ, interacts with XIAP and TAK1/TRAF6 to enhance JNK-mediated anti-apoptotic signaling, and promotes cytoskeletal reorganization and cell survival in response to stress.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"STRADB (PAPK/ILPIP) is a Ste20/germinal center kinase (GCK)-related kinase that couples stress signaling to cytoskeletal remodeling and cell survival [#2]. It forms a complex with LKB1 (Par-4) and Mo25, driving relocalization of LKB1 from the nucleus to the cytoplasm and tight junctions [#0]. STRADB is activated by hydrogen peroxide and its expression rises following growth factor withdrawal, after which it activates the stress kinases JNK1 and ERK6/p38\\u03b3; its catalytic activity is required for ERK6/p38\\u03b3 activation but dispensable for JNK1 activation [#2]. Independently, STRADB interacts with XIAP and co-precipitates with TAK1 and TRAF6, strongly enhancing XIAP-mediated activation of JNK1/2/3 through a TAK1-dependent pathway and potentiating XIAP anti-apoptotic activity without altering caspase inhibition [#1]. Consistent with these signaling outputs, kinase-active STRADB induces cytoskeletal changes and confers resistance to apoptosis triggered by serum withdrawal [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established STRADB as a pro-survival adaptor by linking it physically and functionally to the XIAP\\u2013TAK1\\u2013TRAF6 anti-apoptotic axis, answering how it might bias cells toward survival.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal co-immunoprecipitation, JNK reporter assays, dominant-negative TAK1 epistasis, and apoptosis assays in cultured cells\",\n      \"pmids\": [\"12048196\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not define the direct binding interface or whether STRADB's catalytic activity is required for XIAP/TAK1-mediated JNK activation\",\n        \"In vivo physiological relevance of the XIAP\\u2013STRADB interaction not established\",\n        \"Mechanism by which it potentiates XIAP without altering caspase inhibition unresolved\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined STRADB as a GCK-related kinase activated by oxidative stress and induced upon growth factor withdrawal, connecting its catalytic activity to stress-kinase signaling and survival phenotypes.\",\n      \"evidence\": \"In vitro kinase assay with H2O2 stimulation, inducible stable transfection, kinase-dead mutagenesis, cytoskeletal imaging, and apoptosis assays in NIH3T3/hematopoietic cells\",\n      \"pmids\": [\"12574163\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct physiological substrates of STRADB kinase activity not identified\",\n        \"Why ERK6/p38\\u03b3 activation requires kinase activity but JNK1 activation does not is unexplained\",\n        \"Molecular link between cytoskeletal remodeling and apoptosis resistance not defined\"\n      ]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Placed STRADB within the LKB1\\u2013Mo25 complex and showed it controls LKB1 subcellular localization, implicating it in spatial regulation of LKB1 signaling.\",\n      \"evidence\": \"Tandem affinity purification with mass spectrometry and LKB1 translocation assays in cultured cells\",\n      \"pmids\": [\"14676191\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether STRADB-driven LKB1 relocalization activates MARK kinases not directly demonstrated\",\n        \"How LKB1/Mo25 binding relates to STRADB's XIAP/TAK1 and stress-kinase functions unclear\",\n        \"Stoichiometry and architecture of the STRADB\\u2013LKB1\\u2013Mo25 complex not resolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How STRADB integrates its LKB1/Mo25 scaffolding role with its XIAP\\u2013TAK1 anti-apoptotic and stress-kinase functions, and the identity of its physiological substrates, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No direct kinase substrate identified\",\n        \"No structural model of the STRADB\\u2013LKB1\\u2013Mo25 complex\",\n        \"Whether the LKB1-scaffolding and XIAP/JNK functions occur in the same cells or pathways is unknown\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\"LKB1-STRAD-Mo25 complex\"],\n    \"partners\": [\"STK11\", \"CAB39\", \"XIAP\", \"MAP3K7\", \"TRAF6\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}