{"gene":"CDK5RAP3","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2011,"finding":"CDK5RAP3 is a novel binding partner of PAK4 and enhances PAK4 kinase activity; siRNA-mediated knockdown of PAK4 in CDK5RAP3-overexpressing HCC cells reversed the enhanced cell invasiveness, establishing PAK4 as essential for CDK5RAP3-mediated metastatic function.","method":"Co-immunoprecipitation (binding partner identification), kinase activity assay (PAK4 activation), siRNA knockdown with cell invasion assay (epistasis)","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal binding identified, functional epistasis via siRNA, single lab with two orthogonal methods","pmids":["21385901"],"is_preprint":false},{"year":2012,"finding":"CDK5RAP3 binds directly to the p14ARF promoter in vivo and represses p14ARF transcription; knockdown of p14ARF in CDK5RAP3-depleted HCC cells rescued invasiveness, placing CDK5RAP3 upstream of p14ARF in a transcriptional repression pathway.","method":"Chromatin immunoprecipitation (promoter binding), RT-PCR and Western blot (mRNA/protein levels), siRNA epistasis (cell invasion assay)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes direct promoter binding, functional epistasis confirmed, single lab","pmids":["22860085"],"is_preprint":false},{"year":2003,"finding":"CDK5RAP3 (IC53-2) physically binds the CDK5 activator p35 in vitro, confirming it as a CDK5 activator-binding protein.","method":"In vitro association assay (pulldown)","journal":"Cell research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single in vitro pulldown, no mutagenesis or functional follow-up","pmids":["12737517"],"is_preprint":false},{"year":2016,"finding":"CDK5RAP3 suppresses phosphorylation of GSK-3β at Ser9, thereby promoting phosphorylation (Ser37/Thr41) and subsequent proteasomal degradation of β-catenin, reducing Wnt/β-catenin signaling in gastric cancer cells.","method":"Western blot (phosphorylation status of GSK-3β, β-catenin), overexpression and knockdown in cell lines with proliferation/invasion assays","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pathway placement by phospho-western in gain- and loss-of-function, replicated by a second paper (PMID 29540196)","pmids":["27793695","29540196"],"is_preprint":false},{"year":2018,"finding":"CDK5RAP3 represses AKT phosphorylation (Ser473), which in turn promotes GSK-3β phosphorylation (Ser9) and β-catenin suppression, placing CDK5RAP3 upstream of AKT in the Wnt/β-catenin cascade in gastric cancer.","method":"Western blot in stable CDK5RAP3 overexpression/knockdown gastric cancer cell lines; correlation analysis in 295 patient tumor samples by IHC and Western blot","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-and-loss-of-function with phospho-signaling readout, single lab but large patient cohort corroborates direction","pmids":["29540196"],"is_preprint":false},{"year":2019,"finding":"CDK5RAP3 interacts with UFL1 (the E3 ligase of the UFM1 conjugation system) in vivo, and loss of CDK5RAP3 alters the ufmylation profile in liver cells, identifying CDK5RAP3 as a substrate adaptor for UFMylation.","method":"Co-immunoprecipitation (CDK5RAP3–UFL1 interaction in mouse liver); ufmylation profile analysis in knockout liver cells","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo Co-IP in mouse tissue, functional ufmylation profiling, single lab","pmids":["30635284"],"is_preprint":false},{"year":2019,"finding":"CDK5RAP3 inhibits angiogenesis by suppressing the AKT/HIF-1α/VEGFA signaling axis; CDK5RAP3 knockdown in gastric neuroendocrine carcinoma cells increased VEGFA secretion and promoted endothelial cell migration and tube formation, while overexpression had the opposing effect.","method":"Knockdown/overexpression with tube formation assay, ELISA (VEGFA), Western blot (AKT, HIF-1α), in vivo xenograft angiogenesis assay","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-and-loss-of-function with multiple orthogonal in vitro and in vivo readouts, single lab","pmids":["31728130"],"is_preprint":false},{"year":2019,"finding":"CDK5RAP3 functions as a co-factor for the transcription factor STAT3; CDK5RAP3 binds to STAT3-regulated genomic loci in a STAT3-dependent manner, enhancing STAT3-dependent gene expression; silencing CDK5RAP3 reduces STAT3-mediated clonogenesis and migration.","method":"RNA-interference screen, ChIP (CDK5RAP3 at STAT3 genomic loci), knockdown with clonogenesis and migration assays","journal":"Neoplasia (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP establishes genomic co-occupancy, functional epistasis via RNAi, single lab","pmids":["31765941"],"is_preprint":false},{"year":2020,"finding":"CDK5RAP3 expression is regulated by ERK signaling; ERK inhibition phenocopies CDK5RAP3 overexpression in reducing gastric cancer stem cell self-renewal and EMT, placing CDK5RAP3 downstream of ERK.","method":"ERK inhibitor treatment with Western blot (CDK5RAP3 levels), spheroid formation and invasion assays in cell lines and mouse organoids","journal":"British journal of cancer","confidence":"Low","confidence_rationale":"Tier 3 / Weak — pathway placement inferred from inhibitor experiments, no direct phosphorylation site identified, single lab","pmids":["32606358"],"is_preprint":false},{"year":2020,"finding":"CDK5RAP3 physically interacts with HSF1 (heat shock factor 1) and HSP90, co-localizes with HSF1 in cytoplasm and nucleus, and its deletion impairs nucleoplasmic translocation and trimer formation of HSF1 during heat stress, identifying CDK5RAP3 as a nucleoplasmic shuttle regulating HSF1-mediated heat stress response.","method":"Co-immunoprecipitation and co-immunofluorescence (CDK5RAP3–HSF1, CDK5RAP3–HSP90 interactions), conditional knockout mice and MEFs with heat stress phenotyping, Western blot (HSP expression, ER stress markers)","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus co-localization, in vivo CKO validation, single lab with multiple orthogonal methods","pmids":["33182370"],"is_preprint":false},{"year":2021,"finding":"Cdk5rap3 deficiency in intestinal epithelial cells causes near-complete loss of Paneth cells with downregulation of transcription factors Gfi1 and Sox9, establishing Cdk5rap3 as essential for Paneth cell fate specification; inducible acute deletion in mature Paneth cells leads to disassembly of the rough endoplasmic reticulum and abnormal zymogen granules.","method":"Intestinal epithelial cell-specific and Paneth cell-specific conditional knockout mice; inducible deletion; histology; immunofluorescence; Western blot (Gfi1, Sox9)","journal":"Cell death & disease","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific and inducible KO with defined cellular phenotype (Paneth cell loss, ER disassembly), multiple genetic models in one study","pmids":["33504792"],"is_preprint":false},{"year":2022,"finding":"CDK5RAP3 interacts with RPL26 (ribosomal protein L26); loss of CDK5RAP3 or RPL26 inhibits mTOR/p-mTOR signaling and induces autophagy, linking CDK5RAP3 to regulation of the mTOR pathway through RPL26. CDK5RAP3 deficiency also blocks the cell cycle at G2/M by downregulating CDK1 and Cyclin B1.","method":"Co-immunoprecipitation (CDK5RAP3–RPL26), MEFs from conditional knockout mice, MCF7 knockdown; Western blot (mTOR, CDK1, CCNB1); flow cytometry (cell cycle, apoptosis); autophagy markers","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishes interaction, functional mTOR/cell-cycle phenotypes in KO cells, single lab","pmids":["35509151"],"is_preprint":false},{"year":2022,"finding":"CDK5RAP3 is a novel BRCA2 helical domain-interacting protein; CDK5RAP3 depletion upregulates homologous recombination and single-strand annealing, and reduces spontaneous and DNA damage-induced genomic instability, indicating that CDK5RAP3 negatively regulates double-strand break repair in S-phase.","method":"Co-immunoprecipitation (CDK5RAP3–BRCA2 helical domain), HR/SSA repair assays, genomic instability assays after CDK5RAP3 depletion","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific Co-IP plus functional DNA repair assays, single lab","pmids":["35053516"],"is_preprint":false},{"year":2024,"finding":"CDK5RAP3 deficiency interferes with the UFMylation system and triggers ER-phagy (endoplasmic reticulum-selective autophagy); CDK5RAP3 also maintains the stability of the master transcription factor MEIS2 in neuroblastoma.","method":"Knockdown/overexpression in NB cell lines and xenografts, Western blot (UFMylation components, MEIS2), ER-phagy assays","journal":"Cancer letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mechanistic claims from abstract lack detail on reconstitution or direct binding; single lab, single study","pmids":["38636893"],"is_preprint":false},{"year":2024,"finding":"TSPAN6 promotes glioblastoma progression by interacting with CDK5RAP3 and activating the STAT3 signaling pathway.","method":"Co-immunoprecipitation (TSPAN6–CDK5RAP3 interaction), overexpression/knockdown with proliferation, migration and STAT3 pathway readouts","journal":"International journal of biological sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP, CDK5RAP3 is a secondary finding in a TSPAN6-focused paper, single lab","pmids":["38725860"],"is_preprint":false},{"year":2024,"finding":"CDK5RAP3 inhibits p38MAPK phosphorylation and activity via mediating a p38 interaction with wild-type p53-induced phosphatase 1 (Wip1); under hypoxia, CDK5RAP3 expression decreases in endothelial cells, releasing this inhibition and promoting p38MAPK-dependent angiogenesis.","method":"CDK5RAP3 knockdown in HUVECs under hypoxia, Western blot (p38MAPK phosphorylation), tube formation, migration and proliferation assays, VEGF ELISA","journal":"International heart journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mechanistic description of Wip1 interaction cited from prior literature without direct experimental demonstration in this abstract; knockdown phenotype is the primary evidence, single lab","pmids":["39085114"],"is_preprint":false},{"year":2025,"finding":"NXF3 facilitates nuclear export of CDK5RAP3 mRNA, thereby increasing CDK5RAP3 protein levels and promoting cell cycle progression in gastric cancer cells.","method":"RNA immunoprecipitation sequencing (RIP-Seq), nuclear-cytoplasmic transcriptomics, NXF3 knockdown with Western blot (CDK5RAP3 protein) and cell cycle assays","journal":"Cellular and molecular life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — CDK5RAP3 is a secondary mechanistic finding in an NXF3-focused paper; RIP-Seq evidence is abstract-level, single lab","pmids":["40032765"],"is_preprint":false},{"year":2025,"finding":"Cdk5rap3 deficiency in pancreatic acinar cells increases lysosomal hydrolase cathepsin B and LAMP1, elevating lysosomal activity; it also causes substantial changes to rough ER structure and increases selective ER membrane protein CLIMP63, identifying Cdk5rap3 as a regulator of lysosomal and ER membrane homeostasis essential for acinar cell survival.","method":"Acinar cell-specific knockout mice, tissue histology, Western blot and immunofluorescence (cathepsin B, LAMP1, CLIMP63), electron microscopy (ER structure), primary cell culture","journal":"American journal of physiology. Cell physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tissue-specific KO with multiple subcellular organelle readouts and in vitro confirmation, single lab","pmids":["40637352"],"is_preprint":false},{"year":2025,"finding":"CDK5RAP3 deficiency in neurons increases N-glycosylase proteins RPN1 and ALG2 as well as total glycoprotein levels, causing ER stress and encephalo-dysplasia; CDK5RAP3 normally promotes proteolytic and autophagic degradation of RPN1 and ALG2 to maintain glycoprotein balance.","method":"Neuron-specific CDK5RAP3 knockout mice (Nestin-Cre), transcriptome sequencing, Western blot (RPN1, ALG2, glycoproteins, ER stress markers), MEF in vitro deletion (ROSA26-ERT2Cre)","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo CKO plus in vitro MEF model with transcriptomic and protein-level evidence, single lab","pmids":["40188151"],"is_preprint":false},{"year":2026,"finding":"Only full-length CDK5RAP3 (but not C-terminal alternative isoforms) binds UFL1; CDK5RAP3 deficiency impairs UFMylation of known substrates RPL26 and UFBP1, and CDK5RAP3 acts as an upstream regulator of UFL1 S462 phosphorylation (linked to ATM signaling). Antisense oligonucleotide-mediated restoration of full-length CDK5RAP3 reversed proteomic/phosphoproteomic dysregulation including extracellular matrix organisation, mitotic/genome stability, and cytoskeletal pathways.","method":"Co-immunoprecipitation (full-length vs. C-terminal isoforms with UFL1), Western blot, proteomics and phosphoproteomics in patient amniocytes, RT-PCR (splice variant), ASO rescue experiment","journal":"Acta neuropathologica","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — isoform-specific Co-IP, quantitative proteomics and phosphoproteomics with ASO rescue, multiple orthogonal methods establishing UFMylation adaptor mechanism","pmids":["42045457"],"is_preprint":false},{"year":2026,"finding":"CDK5RAP3 interacts with SMAD4 and CEBPB in Leydig cells; hCG stimulation triggers CDK5RAP3 nuclear translocation; CDK5RAP3 knockdown reduces expression of steroidogenic regulators STAR, CYP11A1, CYP17A1, and HSD3B and impairs testosterone production; BMP pathway inhibition (Noggin) rescues the testosterone deficit caused by CDK5RAP3 loss, placing CDK5RAP3 upstream of BMP signaling in steroidogenesis.","method":"Immunoprecipitation-mass spectrometry (IP-MS, interaction identification), AAV2/9-mediated in vivo knockdown, primary Leydig cell culture, Western blot (STAR, CYP enzymes), serum testosterone ELISA, Noggin epistasis experiment","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — IP-MS binding plus in vivo AAV KD with hormonal readout and pharmacological epistasis, single lab","pmids":["41596239"],"is_preprint":false},{"year":2009,"finding":"Endothelium-specific overexpression of IC53 (CDK5RAP3) in transgenic mice decreases eNOS expression and activity, reduces NO production, impairs endothelium-dependent vasodilation, and elevates systolic blood pressure; inhibition of IC53 in HUVECs upregulates eNOS activity.","method":"VE-cadherin promoter-driven transgenic mouse model, blood pressure measurement, eNOS activity assay, NO measurement, IC53 siRNA knockdown in HUVECs","journal":"Cardiovascular research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo transgenic model with mechanistic eNOS readout and in vitro siRNA validation, single lab","pmids":["19541669"],"is_preprint":false},{"year":2019,"finding":"CDK5RAP3 depletion in liver cells disrupts UFMylation homeostasis and triggers endoplasmic reticulum stress with activation of unfolded protein responses; this ER stress is exacerbated after partial hepatectomy in liver-specific Cdk5rap3 knockout mice and is associated with impaired hepatocyte proliferation and delayed liver regeneration.","method":"Liver-specific CKO mice, partial hepatectomy model, Western blot (ER stress/UPR markers, ufmylation substrates), hepatocyte proliferation assays (BrdU/Ki67)","journal":"Development (Cambridge, England) / The American journal of pathology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo CKO with ufmylation profiling and ER stress phenotype, replicated in two independent studies from the same group","pmids":["30635284","32926856"],"is_preprint":false},{"year":2023,"finding":"CDK5RAP3 knockdown in bovine mammary epithelial cells inhibits autophagolysosome degradation, activates the NF-κB pathway and NLRP3 inflammasome (upregulating NLRP3, IL-1β, IL-6, cleaved caspase-1), and triggers pyroptosis; accumulation of LC3B and p62 confirms the autophagy block.","method":"CDK5RAP3 knockdown in BMECs, Western blot (NLRP3, IL-1β, caspase-1, LC3B, p62, NF-κB), cytokine measurement, cell death assays","journal":"International journal of biological macromolecules","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single-method knockdown with Western blot readouts, no reconstitution or direct binding to inflammasome components, single lab","pmids":["36806767"],"is_preprint":false}],"current_model":"CDK5RAP3 is a multifunctional adaptor protein that, in its full-length form, binds UFL1 and facilitates UFMylation of substrates (RPL26, UFBP1) to maintain ER homeostasis; it also directly binds and activates PAK4, represses p14ARF transcription via promoter binding, inhibits AKT–GSK-3β–β-catenin/Wnt signaling, co-occupies STAT3-regulated genomic loci as a transcriptional co-factor, interacts with HSF1/HSP90 to regulate heat-shock responses and nucleocytoplasmic shuttling, interacts with BRCA2 to negatively regulate double-strand break repair, controls lysosomal and ER membrane homeostasis in exocrine cells, and regulates Leydig cell steroidogenesis through interactions with SMAD4/CEBPB upstream of BMP signaling—with its loss broadly triggering ER stress, autophagy dysregulation, and NLRP3 inflammasome activation across multiple tissues."},"narrative":{"mechanistic_narrative":"CDK5RAP3 is a multifunctional adaptor that couples the UFM1 conjugation system to endoplasmic reticulum homeostasis and acts as a signaling and transcriptional modulator across multiple tissues [PMID:30635284, PMID:42045457]. Its best-defined biochemical role is as a substrate adaptor for UFMylation: only full-length CDK5RAP3 binds the E3 ligase UFL1, and its loss impairs UFMylation of the substrates RPL26 and UFBP1 while controlling UFL1 phosphorylation, with restoration of full-length protein reversing proteomic and phosphoproteomic dysregulation spanning extracellular matrix, genome-stability, and cytoskeletal programs [PMID:42045457]. Through this and related activities, CDK5RAP3 maintains ER and organelle integrity; its deficiency disrupts UFMylation homeostasis and provokes ER stress and unfolded-protein responses in liver [PMID:30635284, PMID:32926856], triggers ER-membrane and lysosomal remodeling in pancreatic acinar cells [PMID:40637352], drives ER stress and encephalo-dysplasia in neurons by allowing accumulation of the N-glycosylation proteins RPN1 and ALG2 that CDK5RAP3 normally targets for degradation [PMID:40188151], and is required for Paneth cell fate specification and rough-ER architecture in the intestine [PMID:33504792]. CDK5RAP3 additionally functions in the nucleus and in signaling: it binds the BRCA2 helical domain to negatively regulate double-strand break repair [PMID:35053516], interacts with HSF1 and HSP90 to govern HSF1 nucleocytoplasmic shuttling during heat stress [PMID:33182370], serves as a STAT3 transcriptional co-factor occupying STAT3 target loci [PMID:31765941], and represses Wnt/β-catenin signaling by suppressing AKT and promoting GSK-3β-dependent β-catenin degradation [PMID:27793695, PMID:29540196]. It also binds and activates PAK4 [PMID:21385901] and represses p14ARF transcription [PMID:22860085]. A disease-linked study established that full-length CDK5RAP3 loss underlies a neurodevelopmental disorder rescuable by antisense-oligonucleotide restoration of the full-length isoform [PMID:42045457].","teleology":[{"year":2003,"claim":"Established the first physical link of CDK5RAP3 to CDK5 regulation by showing it binds the CDK5 activator p35, originally framing the protein as a CDK5 activator-binding protein.","evidence":"In vitro pulldown of CDK5RAP3 (IC53-2) with p35","pmids":["12737517"],"confidence":"Low","gaps":["Single in vitro pulldown without mutagenesis or functional follow-up","No demonstration that the interaction modulates CDK5 activity in cells","Subsequent timeline findings do not develop a CDK5-centric function"]},{"year":2009,"claim":"Addressed whether CDK5RAP3 has a vascular function in vivo by showing endothelial overexpression suppresses eNOS and raises blood pressure, the first physiological loss/gain-of-function readout.","evidence":"VE-cadherin-driven transgenic mice and HUVEC siRNA with eNOS/NO and blood-pressure assays","pmids":["19541669"],"confidence":"Medium","gaps":["Molecular mechanism linking CDK5RAP3 to eNOS not defined","No binding partner identified in the vascular context"]},{"year":2012,"claim":"Defined nuclear and signaling roles in cancer, showing CDK5RAP3 binds and activates PAK4 and directly represses the p14ARF promoter to drive invasiveness.","evidence":"Co-IP, kinase assay, ChIP and siRNA epistasis with invasion assays in HCC cells","pmids":["21385901","22860085"],"confidence":"Medium","gaps":["Mechanism of CDK5RAP3 recruitment to the p14ARF promoter unknown","Whether PAK4 activation and ARF repression are connected is not resolved"]},{"year":2018,"claim":"Placed CDK5RAP3 in the AKT–GSK-3β–β-catenin axis as a Wnt suppressor, resolving its directionality in gastric cancer signaling.","evidence":"Phospho-Western in stable gain/loss-of-function lines plus a 295-sample patient cohort","pmids":["27793695","29540196"],"confidence":"Medium","gaps":["Direct molecular target of CDK5RAP3 in the AKT/GSK-3β cascade not identified","Whether regulation is direct or indirect is unclear"]},{"year":2019,"claim":"Identified the central biochemical role of CDK5RAP3 as a UFL1-interacting adaptor of the UFM1 conjugation system whose loss disrupts UFMylation and triggers ER stress.","evidence":"In vivo Co-IP in mouse liver, ufmylation profiling, and liver-specific knockout with partial-hepatectomy ER-stress phenotyping","pmids":["30635284","32926856"],"confidence":"Medium","gaps":["Substrate repertoire of the adaptor not fully defined at this stage","Direct vs indirect contribution to ER stress not separated"]},{"year":2019,"claim":"Expanded CDK5RAP3 into transcriptional, stress-response and angiogenic regulation by establishing STAT3 genomic co-occupancy, HSF1/HSP90 binding controlling HSF1 shuttling, and AKT/HIF-1α/VEGFA-dependent angiogenesis suppression.","evidence":"ChIP for STAT3 loci, reciprocal Co-IP and co-IF with HSF1/HSP90, conditional KO heat-stress phenotyping, and angiogenesis/tube-formation assays","pmids":["31765941","33182370","31728130"],"confidence":"Medium","gaps":["Whether CDK5RAP3 binds DNA directly or via partners at STAT3 loci unknown","Structural basis of HSF1/HSP90 interaction undefined"]},{"year":2022,"claim":"Connected CDK5RAP3 to genome maintenance and growth control through BRCA2 helical-domain binding that restrains DSB repair, and RPL26 binding that links it to mTOR signaling, autophagy, and G2/M progression.","evidence":"Domain-specific Co-IP, HR/SSA and genomic-instability assays, and KO MEF/knockdown studies of mTOR and cell-cycle markers","pmids":["35053516","35509151"],"confidence":"Medium","gaps":["How CDK5RAP3 mechanistically suppresses HR is not resolved","Whether RPL26 binding intersects the UFMylation role is untested"]},{"year":2021,"claim":"Demonstrated tissue-essential roles for CDK5RAP3 in secretory cell biology, establishing it as required for Paneth cell fate and rough-ER integrity in vivo.","evidence":"Intestinal- and Paneth-cell-specific and inducible conditional knockout mice with histology, immunofluorescence and Gfi1/Sox9 analysis","pmids":["33504792"],"confidence":"High","gaps":["Molecular link between CDK5RAP3 and Gfi1/Sox9 transcription not defined","Whether the ER phenotype is UFMylation-dependent not directly shown"]},{"year":2025,"claim":"Generalized the ER/organelle-homeostasis function across tissues, showing CDK5RAP3 loss remodels lysosomal and ER membranes in acinar cells and drives glycoprotein accumulation (RPN1, ALG2) and ER stress in neurons.","evidence":"Acinar- and neuron-specific knockout mice with EM, organelle-marker Western blot/IF, and transcriptomics","pmids":["40637352","40188151"],"confidence":"Medium","gaps":["Whether RPN1/ALG2 degradation is directly mediated by UFMylation is not established","Mechanism of CLIMP63 and lysosomal upregulation unknown"]},{"year":2026,"claim":"Resolved the isoform-specific UFMylation-adaptor mechanism and tied it to human disease, showing only full-length CDK5RAP3 binds UFL1, controls RPL26/UFBP1 UFMylation and UFL1 S462 phosphorylation, with ASO rescue reversing the defect.","evidence":"Isoform-specific Co-IP, quantitative proteomics/phosphoproteomics in patient amniocytes, splice-variant RT-PCR and ASO rescue","pmids":["42045457"],"confidence":"High","gaps":["Precise UFL1 region engaged by full-length CDK5RAP3 not structurally defined","How CDK5RAP3 controls UFL1 S462 phosphorylation mechanistically is unresolved"]},{"year":2026,"claim":"Extended CDK5RAP3 to endocrine regulation by showing SMAD4/CEBPB interaction and hCG-driven nuclear translocation place it upstream of BMP signaling in Leydig-cell steroidogenesis.","evidence":"IP-MS, AAV-mediated in vivo knockdown, steroidogenic-enzyme Western blot, testosterone ELISA and Noggin epistasis","pmids":["41596239"],"confidence":"Medium","gaps":["Direct vs indirect SMAD4/CEBPB binding not dissected","Link between BMP regulation and the UFMylation function unexplored"]},{"year":null,"claim":"It remains unresolved how CDK5RAP3's core UFL1/UFMylation adaptor activity mechanistically accounts for its diverse transcriptional, DNA-repair, and signaling roles, and whether these represent independent functions or downstream consequences of disrupted UFMylation.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of CDK5RAP3 with any partner","Substrate selectivity of the UFMylation adaptor not comprehensively mapped","Integration of cytoplasmic vs nuclear functions undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,19]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[1,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,9]},{"term_id":"GO:0003677","term_label":"DNA binding","supporting_discovery_ids":[1,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[22,17,10]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9,7,20]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[5,19]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[22,18,9]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[11,13]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,4]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[12]}],"complexes":["UFM1 conjugation (UFL1) system"],"partners":["UFL1","RPL26","UFBP1","BRCA2","HSF1","HSP90","PAK4","STAT3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96JB5","full_name":"CDK5 regulatory subunit-associated protein 3","aliases":["CDK5 activator-binding protein C53","LXXLL/leucine-zipper-containing ARF-binding protein","Protein HSF-27"],"length_aa":506,"mass_kda":56.9,"function":"Substrate adapter of E3 ligase complexes mediating ufmylation, the covalent attachment of the ubiquitin-like modifier UFM1 to substrate proteins, and which is involved in various processes, such as ribosome recycling and reticulophagy (also called ER-phagy) (PubMed:23152784, PubMed:30635284, PubMed:32851973, PubMed:36121123, PubMed:36543799, PubMed:37595036, PubMed:38383785, PubMed:38383789). As part of the UREL complex, plays a key role in ribosome recycling by promoting mono-ufmylation of RPL26/uL24 subunit of the 60S ribosome (PubMed:38383785, PubMed:38383789). Ufmylation of RPL26/uL24 occurs on free 60S ribosomes following ribosome dissociation: it weakens the junction between post-termination 60S subunits and SEC61 translocons, promoting release and recycling of the large ribosomal subunit from the endoplasmic reticulum membrane (PubMed:38383785, PubMed:38383789). Ufmylation of RPL26/uL24 and subsequent 60S ribosome recycling either take place after normal termination of translation or after ribosome stalling during cotranslational translocation at the endoplasmic reticulum (PubMed:32851973, PubMed:37595036, PubMed:38383785, PubMed:38383789). Within the UREL complex, CDK5RAP3 acts as a substrate adapter that constrains UFL1 ligase activity to mono-ufmylate RPL26/uL24 at 'Lys-134' (PubMed:36121123, PubMed:38383785, PubMed:38383789). The UREL complex is also involved in reticulophagy in response to endoplasmic reticulum stress by promoting ufmylation of proteins such as CYB5R3, thereby promoting lysosomal degradation of ufmylated proteins (PubMed:36543799). Also acts as a regulator of transcription: negatively regulates NF-kappa-B-mediated gene transcription through the control of RELA phosphorylation (PubMed:17785205, PubMed:20228063). Also regulates mitotic G2/M transition checkpoint and mitotic G2 DNA damage checkpoint (PubMed:15790566, PubMed:19223857). Through its interaction with CDKN2A/ARF and MDM2 may induce MDM2-dependent p53/TP53 ubiquitination, stabilization and activation in the nucleus, thereby promoting G1 cell cycle arrest and inhibition of cell proliferation (PubMed:16173922). May also play a role in the rupture of the nuclear envelope during apoptosis (PubMed:23478299). May regulate MAPK14 activity by regulating its dephosphorylation by PPM1D/WIP1 (PubMed:21283629). Required for liver development (By similarity) (Microbial infection) May be negatively regulated by hepatitis B virus large envelope protein mutant pre-s2 to promote mitotic entry","subcellular_location":"Endoplasmic reticulum membrane; Cytoplasm; Nucleus; Cytoplasm, cytoskeleton, microtubule organizing center, centrosome; Cytoplasm, cytoskeleton","url":"https://www.uniprot.org/uniprotkb/Q96JB5/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CDK5RAP3","classification":"Not Classified","n_dependent_lines":151,"n_total_lines":1208,"dependency_fraction":0.125},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"TMED10","stoichiometry":0.2},{"gene":"CCDC47","stoichiometry":0.2},{"gene":"NCLN","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CDK5RAP3","total_profiled":1310},"omim":[{"mim_id":"616177","title":"DDRGK 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all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CDK5RAP3"},"hgnc":{"alias_symbol":["MST016","FLJ13660","C53","IC53","HSF-27","OK/SW-cl.114","LZAP"],"prev_symbol":[]},"alphafold":{"accession":"Q96JB5","domains":[{"cath_id":"-","chopping":"9-133","consensus_level":"medium","plddt":88.5487,"start":9,"end":133}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JB5","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JB5-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96JB5-F1-predicted_aligned_error_v6.png","plddt_mean":82.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CDK5RAP3","jax_strain_url":"https://www.jax.org/strain/search?query=CDK5RAP3"},"sequence":{"accession":"Q96JB5","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96JB5.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96JB5/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96JB5"}},"corpus_meta":[{"pmid":"21385901","id":"PMC_21385901","title":"Overexpression 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siRNA-mediated knockdown of PAK4 in CDK5RAP3-overexpressing HCC cells reversed the enhanced cell invasiveness, establishing PAK4 as essential for CDK5RAP3-mediated metastatic function.\",\n      \"method\": \"Co-immunoprecipitation (binding partner identification), kinase activity assay (PAK4 activation), siRNA knockdown with cell invasion assay (epistasis)\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal binding identified, functional epistasis via siRNA, single lab with two orthogonal methods\",\n      \"pmids\": [\"21385901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CDK5RAP3 binds directly to the p14ARF promoter in vivo and represses p14ARF transcription; knockdown of p14ARF in CDK5RAP3-depleted HCC cells rescued invasiveness, placing CDK5RAP3 upstream of p14ARF in a transcriptional repression pathway.\",\n      \"method\": \"Chromatin immunoprecipitation (promoter binding), RT-PCR and Western blot (mRNA/protein levels), siRNA epistasis (cell invasion assay)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes direct promoter binding, functional epistasis confirmed, single lab\",\n      \"pmids\": [\"22860085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"CDK5RAP3 (IC53-2) physically binds the CDK5 activator p35 in vitro, confirming it as a CDK5 activator-binding protein.\",\n      \"method\": \"In vitro association assay (pulldown)\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single in vitro pulldown, no mutagenesis or functional follow-up\",\n      \"pmids\": [\"12737517\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CDK5RAP3 suppresses phosphorylation of GSK-3β at Ser9, thereby promoting phosphorylation (Ser37/Thr41) and subsequent proteasomal degradation of β-catenin, reducing Wnt/β-catenin signaling in gastric cancer cells.\",\n      \"method\": \"Western blot (phosphorylation status of GSK-3β, β-catenin), overexpression and knockdown in cell lines with proliferation/invasion assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pathway placement by phospho-western in gain- and loss-of-function, replicated by a second paper (PMID 29540196)\",\n      \"pmids\": [\"27793695\", \"29540196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CDK5RAP3 represses AKT phosphorylation (Ser473), which in turn promotes GSK-3β phosphorylation (Ser9) and β-catenin suppression, placing CDK5RAP3 upstream of AKT in the Wnt/β-catenin cascade in gastric cancer.\",\n      \"method\": \"Western blot in stable CDK5RAP3 overexpression/knockdown gastric cancer cell lines; correlation analysis in 295 patient tumor samples by IHC and Western blot\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-and-loss-of-function with phospho-signaling readout, single lab but large patient cohort corroborates direction\",\n      \"pmids\": [\"29540196\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5RAP3 interacts with UFL1 (the E3 ligase of the UFM1 conjugation system) in vivo, and loss of CDK5RAP3 alters the ufmylation profile in liver cells, identifying CDK5RAP3 as a substrate adaptor for UFMylation.\",\n      \"method\": \"Co-immunoprecipitation (CDK5RAP3–UFL1 interaction in mouse liver); ufmylation profile analysis in knockout liver cells\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo Co-IP in mouse tissue, functional ufmylation profiling, single lab\",\n      \"pmids\": [\"30635284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5RAP3 inhibits angiogenesis by suppressing the AKT/HIF-1α/VEGFA signaling axis; CDK5RAP3 knockdown in gastric neuroendocrine carcinoma cells increased VEGFA secretion and promoted endothelial cell migration and tube formation, while overexpression had the opposing effect.\",\n      \"method\": \"Knockdown/overexpression with tube formation assay, ELISA (VEGFA), Western blot (AKT, HIF-1α), in vivo xenograft angiogenesis assay\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-and-loss-of-function with multiple orthogonal in vitro and in vivo readouts, single lab\",\n      \"pmids\": [\"31728130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5RAP3 functions as a co-factor for the transcription factor STAT3; CDK5RAP3 binds to STAT3-regulated genomic loci in a STAT3-dependent manner, enhancing STAT3-dependent gene expression; silencing CDK5RAP3 reduces STAT3-mediated clonogenesis and migration.\",\n      \"method\": \"RNA-interference screen, ChIP (CDK5RAP3 at STAT3 genomic loci), knockdown with clonogenesis and migration assays\",\n      \"journal\": \"Neoplasia (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP establishes genomic co-occupancy, functional epistasis via RNAi, single lab\",\n      \"pmids\": [\"31765941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDK5RAP3 expression is regulated by ERK signaling; ERK inhibition phenocopies CDK5RAP3 overexpression in reducing gastric cancer stem cell self-renewal and EMT, placing CDK5RAP3 downstream of ERK.\",\n      \"method\": \"ERK inhibitor treatment with Western blot (CDK5RAP3 levels), spheroid formation and invasion assays in cell lines and mouse organoids\",\n      \"journal\": \"British journal of cancer\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — pathway placement inferred from inhibitor experiments, no direct phosphorylation site identified, single lab\",\n      \"pmids\": [\"32606358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CDK5RAP3 physically interacts with HSF1 (heat shock factor 1) and HSP90, co-localizes with HSF1 in cytoplasm and nucleus, and its deletion impairs nucleoplasmic translocation and trimer formation of HSF1 during heat stress, identifying CDK5RAP3 as a nucleoplasmic shuttle regulating HSF1-mediated heat stress response.\",\n      \"method\": \"Co-immunoprecipitation and co-immunofluorescence (CDK5RAP3–HSF1, CDK5RAP3–HSP90 interactions), conditional knockout mice and MEFs with heat stress phenotyping, Western blot (HSP expression, ER stress markers)\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus co-localization, in vivo CKO validation, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"33182370\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Cdk5rap3 deficiency in intestinal epithelial cells causes near-complete loss of Paneth cells with downregulation of transcription factors Gfi1 and Sox9, establishing Cdk5rap3 as essential for Paneth cell fate specification; inducible acute deletion in mature Paneth cells leads to disassembly of the rough endoplasmic reticulum and abnormal zymogen granules.\",\n      \"method\": \"Intestinal epithelial cell-specific and Paneth cell-specific conditional knockout mice; inducible deletion; histology; immunofluorescence; Western blot (Gfi1, Sox9)\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific and inducible KO with defined cellular phenotype (Paneth cell loss, ER disassembly), multiple genetic models in one study\",\n      \"pmids\": [\"33504792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK5RAP3 interacts with RPL26 (ribosomal protein L26); loss of CDK5RAP3 or RPL26 inhibits mTOR/p-mTOR signaling and induces autophagy, linking CDK5RAP3 to regulation of the mTOR pathway through RPL26. CDK5RAP3 deficiency also blocks the cell cycle at G2/M by downregulating CDK1 and Cyclin B1.\",\n      \"method\": \"Co-immunoprecipitation (CDK5RAP3–RPL26), MEFs from conditional knockout mice, MCF7 knockdown; Western blot (mTOR, CDK1, CCNB1); flow cytometry (cell cycle, apoptosis); autophagy markers\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishes interaction, functional mTOR/cell-cycle phenotypes in KO cells, single lab\",\n      \"pmids\": [\"35509151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK5RAP3 is a novel BRCA2 helical domain-interacting protein; CDK5RAP3 depletion upregulates homologous recombination and single-strand annealing, and reduces spontaneous and DNA damage-induced genomic instability, indicating that CDK5RAP3 negatively regulates double-strand break repair in S-phase.\",\n      \"method\": \"Co-immunoprecipitation (CDK5RAP3–BRCA2 helical domain), HR/SSA repair assays, genomic instability assays after CDK5RAP3 depletion\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific Co-IP plus functional DNA repair assays, single lab\",\n      \"pmids\": [\"35053516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDK5RAP3 deficiency interferes with the UFMylation system and triggers ER-phagy (endoplasmic reticulum-selective autophagy); CDK5RAP3 also maintains the stability of the master transcription factor MEIS2 in neuroblastoma.\",\n      \"method\": \"Knockdown/overexpression in NB cell lines and xenografts, Western blot (UFMylation components, MEIS2), ER-phagy assays\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mechanistic claims from abstract lack detail on reconstitution or direct binding; single lab, single study\",\n      \"pmids\": [\"38636893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TSPAN6 promotes glioblastoma progression by interacting with CDK5RAP3 and activating the STAT3 signaling pathway.\",\n      \"method\": \"Co-immunoprecipitation (TSPAN6–CDK5RAP3 interaction), overexpression/knockdown with proliferation, migration and STAT3 pathway readouts\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP, CDK5RAP3 is a secondary finding in a TSPAN6-focused paper, single lab\",\n      \"pmids\": [\"38725860\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CDK5RAP3 inhibits p38MAPK phosphorylation and activity via mediating a p38 interaction with wild-type p53-induced phosphatase 1 (Wip1); under hypoxia, CDK5RAP3 expression decreases in endothelial cells, releasing this inhibition and promoting p38MAPK-dependent angiogenesis.\",\n      \"method\": \"CDK5RAP3 knockdown in HUVECs under hypoxia, Western blot (p38MAPK phosphorylation), tube formation, migration and proliferation assays, VEGF ELISA\",\n      \"journal\": \"International heart journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mechanistic description of Wip1 interaction cited from prior literature without direct experimental demonstration in this abstract; knockdown phenotype is the primary evidence, single lab\",\n      \"pmids\": [\"39085114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NXF3 facilitates nuclear export of CDK5RAP3 mRNA, thereby increasing CDK5RAP3 protein levels and promoting cell cycle progression in gastric cancer cells.\",\n      \"method\": \"RNA immunoprecipitation sequencing (RIP-Seq), nuclear-cytoplasmic transcriptomics, NXF3 knockdown with Western blot (CDK5RAP3 protein) and cell cycle assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — CDK5RAP3 is a secondary mechanistic finding in an NXF3-focused paper; RIP-Seq evidence is abstract-level, single lab\",\n      \"pmids\": [\"40032765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Cdk5rap3 deficiency in pancreatic acinar cells increases lysosomal hydrolase cathepsin B and LAMP1, elevating lysosomal activity; it also causes substantial changes to rough ER structure and increases selective ER membrane protein CLIMP63, identifying Cdk5rap3 as a regulator of lysosomal and ER membrane homeostasis essential for acinar cell survival.\",\n      \"method\": \"Acinar cell-specific knockout mice, tissue histology, Western blot and immunofluorescence (cathepsin B, LAMP1, CLIMP63), electron microscopy (ER structure), primary cell culture\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tissue-specific KO with multiple subcellular organelle readouts and in vitro confirmation, single lab\",\n      \"pmids\": [\"40637352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CDK5RAP3 deficiency in neurons increases N-glycosylase proteins RPN1 and ALG2 as well as total glycoprotein levels, causing ER stress and encephalo-dysplasia; CDK5RAP3 normally promotes proteolytic and autophagic degradation of RPN1 and ALG2 to maintain glycoprotein balance.\",\n      \"method\": \"Neuron-specific CDK5RAP3 knockout mice (Nestin-Cre), transcriptome sequencing, Western blot (RPN1, ALG2, glycoproteins, ER stress markers), MEF in vitro deletion (ROSA26-ERT2Cre)\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo CKO plus in vitro MEF model with transcriptomic and protein-level evidence, single lab\",\n      \"pmids\": [\"40188151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Only full-length CDK5RAP3 (but not C-terminal alternative isoforms) binds UFL1; CDK5RAP3 deficiency impairs UFMylation of known substrates RPL26 and UFBP1, and CDK5RAP3 acts as an upstream regulator of UFL1 S462 phosphorylation (linked to ATM signaling). Antisense oligonucleotide-mediated restoration of full-length CDK5RAP3 reversed proteomic/phosphoproteomic dysregulation including extracellular matrix organisation, mitotic/genome stability, and cytoskeletal pathways.\",\n      \"method\": \"Co-immunoprecipitation (full-length vs. C-terminal isoforms with UFL1), Western blot, proteomics and phosphoproteomics in patient amniocytes, RT-PCR (splice variant), ASO rescue experiment\",\n      \"journal\": \"Acta neuropathologica\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — isoform-specific Co-IP, quantitative proteomics and phosphoproteomics with ASO rescue, multiple orthogonal methods establishing UFMylation adaptor mechanism\",\n      \"pmids\": [\"42045457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"CDK5RAP3 interacts with SMAD4 and CEBPB in Leydig cells; hCG stimulation triggers CDK5RAP3 nuclear translocation; CDK5RAP3 knockdown reduces expression of steroidogenic regulators STAR, CYP11A1, CYP17A1, and HSD3B and impairs testosterone production; BMP pathway inhibition (Noggin) rescues the testosterone deficit caused by CDK5RAP3 loss, placing CDK5RAP3 upstream of BMP signaling in steroidogenesis.\",\n      \"method\": \"Immunoprecipitation-mass spectrometry (IP-MS, interaction identification), AAV2/9-mediated in vivo knockdown, primary Leydig cell culture, Western blot (STAR, CYP enzymes), serum testosterone ELISA, Noggin epistasis experiment\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — IP-MS binding plus in vivo AAV KD with hormonal readout and pharmacological epistasis, single lab\",\n      \"pmids\": [\"41596239\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Endothelium-specific overexpression of IC53 (CDK5RAP3) in transgenic mice decreases eNOS expression and activity, reduces NO production, impairs endothelium-dependent vasodilation, and elevates systolic blood pressure; inhibition of IC53 in HUVECs upregulates eNOS activity.\",\n      \"method\": \"VE-cadherin promoter-driven transgenic mouse model, blood pressure measurement, eNOS activity assay, NO measurement, IC53 siRNA knockdown in HUVECs\",\n      \"journal\": \"Cardiovascular research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo transgenic model with mechanistic eNOS readout and in vitro siRNA validation, single lab\",\n      \"pmids\": [\"19541669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CDK5RAP3 depletion in liver cells disrupts UFMylation homeostasis and triggers endoplasmic reticulum stress with activation of unfolded protein responses; this ER stress is exacerbated after partial hepatectomy in liver-specific Cdk5rap3 knockout mice and is associated with impaired hepatocyte proliferation and delayed liver regeneration.\",\n      \"method\": \"Liver-specific CKO mice, partial hepatectomy model, Western blot (ER stress/UPR markers, ufmylation substrates), hepatocyte proliferation assays (BrdU/Ki67)\",\n      \"journal\": \"Development (Cambridge, England) / The American journal of pathology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo CKO with ufmylation profiling and ER stress phenotype, replicated in two independent studies from the same group\",\n      \"pmids\": [\"30635284\", \"32926856\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CDK5RAP3 knockdown in bovine mammary epithelial cells inhibits autophagolysosome degradation, activates the NF-κB pathway and NLRP3 inflammasome (upregulating NLRP3, IL-1β, IL-6, cleaved caspase-1), and triggers pyroptosis; accumulation of LC3B and p62 confirms the autophagy block.\",\n      \"method\": \"CDK5RAP3 knockdown in BMECs, Western blot (NLRP3, IL-1β, caspase-1, LC3B, p62, NF-κB), cytokine measurement, cell death assays\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single-method knockdown with Western blot readouts, no reconstitution or direct binding to inflammasome components, single lab\",\n      \"pmids\": [\"36806767\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CDK5RAP3 is a multifunctional adaptor protein that, in its full-length form, binds UFL1 and facilitates UFMylation of substrates (RPL26, UFBP1) to maintain ER homeostasis; it also directly binds and activates PAK4, represses p14ARF transcription via promoter binding, inhibits AKT–GSK-3β–β-catenin/Wnt signaling, co-occupies STAT3-regulated genomic loci as a transcriptional co-factor, interacts with HSF1/HSP90 to regulate heat-shock responses and nucleocytoplasmic shuttling, interacts with BRCA2 to negatively regulate double-strand break repair, controls lysosomal and ER membrane homeostasis in exocrine cells, and regulates Leydig cell steroidogenesis through interactions with SMAD4/CEBPB upstream of BMP signaling—with its loss broadly triggering ER stress, autophagy dysregulation, and NLRP3 inflammasome activation across multiple tissues.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CDK5RAP3 is a multifunctional adaptor that couples the UFM1 conjugation system to endoplasmic reticulum homeostasis and acts as a signaling and transcriptional modulator across multiple tissues [#5, #19]. Its best-defined biochemical role is as a substrate adaptor for UFMylation: only full-length CDK5RAP3 binds the E3 ligase UFL1, and its loss impairs UFMylation of the substrates RPL26 and UFBP1 while controlling UFL1 phosphorylation, with restoration of full-length protein reversing proteomic and phosphoproteomic dysregulation spanning extracellular matrix, genome-stability, and cytoskeletal programs [#19]. Through this and related activities, CDK5RAP3 maintains ER and organelle integrity; its deficiency disrupts UFMylation homeostasis and provokes ER stress and unfolded-protein responses in liver [#22], triggers ER-membrane and lysosomal remodeling in pancreatic acinar cells [#17], drives ER stress and encephalo-dysplasia in neurons by allowing accumulation of the N-glycosylation proteins RPN1 and ALG2 that CDK5RAP3 normally targets for degradation [#18], and is required for Paneth cell fate specification and rough-ER architecture in the intestine [#10]. CDK5RAP3 additionally functions in the nucleus and in signaling: it binds the BRCA2 helical domain to negatively regulate double-strand break repair [#12], interacts with HSF1 and HSP90 to govern HSF1 nucleocytoplasmic shuttling during heat stress [#9], serves as a STAT3 transcriptional co-factor occupying STAT3 target loci [#7], and represses Wnt/β-catenin signaling by suppressing AKT and promoting GSK-3β-dependent β-catenin degradation [#3, #4]. It also binds and activates PAK4 [#0] and represses p14ARF transcription [#1]. A disease-linked study established that full-length CDK5RAP3 loss underlies a neurodevelopmental disorder rescuable by antisense-oligonucleotide restoration of the full-length isoform [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the first physical link of CDK5RAP3 to CDK5 regulation by showing it binds the CDK5 activator p35, originally framing the protein as a CDK5 activator-binding protein.\",\n      \"evidence\": \"In vitro pulldown of CDK5RAP3 (IC53-2) with p35\",\n      \"pmids\": [\"12737517\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single in vitro pulldown without mutagenesis or functional follow-up\", \"No demonstration that the interaction modulates CDK5 activity in cells\", \"Subsequent timeline findings do not develop a CDK5-centric function\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Addressed whether CDK5RAP3 has a vascular function in vivo by showing endothelial overexpression suppresses eNOS and raises blood pressure, the first physiological loss/gain-of-function readout.\",\n      \"evidence\": \"VE-cadherin-driven transgenic mice and HUVEC siRNA with eNOS/NO and blood-pressure assays\",\n      \"pmids\": [\"19541669\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism linking CDK5RAP3 to eNOS not defined\", \"No binding partner identified in the vascular context\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defined nuclear and signaling roles in cancer, showing CDK5RAP3 binds and activates PAK4 and directly represses the p14ARF promoter to drive invasiveness.\",\n      \"evidence\": \"Co-IP, kinase assay, ChIP and siRNA epistasis with invasion assays in HCC cells\",\n      \"pmids\": [\"21385901\", \"22860085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of CDK5RAP3 recruitment to the p14ARF promoter unknown\", \"Whether PAK4 activation and ARF repression are connected is not resolved\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Placed CDK5RAP3 in the AKT–GSK-3β–β-catenin axis as a Wnt suppressor, resolving its directionality in gastric cancer signaling.\",\n      \"evidence\": \"Phospho-Western in stable gain/loss-of-function lines plus a 295-sample patient cohort\",\n      \"pmids\": [\"27793695\", \"29540196\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular target of CDK5RAP3 in the AKT/GSK-3β cascade not identified\", \"Whether regulation is direct or indirect is unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the central biochemical role of CDK5RAP3 as a UFL1-interacting adaptor of the UFM1 conjugation system whose loss disrupts UFMylation and triggers ER stress.\",\n      \"evidence\": \"In vivo Co-IP in mouse liver, ufmylation profiling, and liver-specific knockout with partial-hepatectomy ER-stress phenotyping\",\n      \"pmids\": [\"30635284\", \"32926856\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Substrate repertoire of the adaptor not fully defined at this stage\", \"Direct vs indirect contribution to ER stress not separated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Expanded CDK5RAP3 into transcriptional, stress-response and angiogenic regulation by establishing STAT3 genomic co-occupancy, HSF1/HSP90 binding controlling HSF1 shuttling, and AKT/HIF-1α/VEGFA-dependent angiogenesis suppression.\",\n      \"evidence\": \"ChIP for STAT3 loci, reciprocal Co-IP and co-IF with HSF1/HSP90, conditional KO heat-stress phenotyping, and angiogenesis/tube-formation assays\",\n      \"pmids\": [\"31765941\", \"33182370\", \"31728130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CDK5RAP3 binds DNA directly or via partners at STAT3 loci unknown\", \"Structural basis of HSF1/HSP90 interaction undefined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected CDK5RAP3 to genome maintenance and growth control through BRCA2 helical-domain binding that restrains DSB repair, and RPL26 binding that links it to mTOR signaling, autophagy, and G2/M progression.\",\n      \"evidence\": \"Domain-specific Co-IP, HR/SSA and genomic-instability assays, and KO MEF/knockdown studies of mTOR and cell-cycle markers\",\n      \"pmids\": [\"35053516\", \"35509151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How CDK5RAP3 mechanistically suppresses HR is not resolved\", \"Whether RPL26 binding intersects the UFMylation role is untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated tissue-essential roles for CDK5RAP3 in secretory cell biology, establishing it as required for Paneth cell fate and rough-ER integrity in vivo.\",\n      \"evidence\": \"Intestinal- and Paneth-cell-specific and inducible conditional knockout mice with histology, immunofluorescence and Gfi1/Sox9 analysis\",\n      \"pmids\": [\"33504792\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between CDK5RAP3 and Gfi1/Sox9 transcription not defined\", \"Whether the ER phenotype is UFMylation-dependent not directly shown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Generalized the ER/organelle-homeostasis function across tissues, showing CDK5RAP3 loss remodels lysosomal and ER membranes in acinar cells and drives glycoprotein accumulation (RPN1, ALG2) and ER stress in neurons.\",\n      \"evidence\": \"Acinar- and neuron-specific knockout mice with EM, organelle-marker Western blot/IF, and transcriptomics\",\n      \"pmids\": [\"40637352\", \"40188151\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RPN1/ALG2 degradation is directly mediated by UFMylation is not established\", \"Mechanism of CLIMP63 and lysosomal upregulation unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Resolved the isoform-specific UFMylation-adaptor mechanism and tied it to human disease, showing only full-length CDK5RAP3 binds UFL1, controls RPL26/UFBP1 UFMylation and UFL1 S462 phosphorylation, with ASO rescue reversing the defect.\",\n      \"evidence\": \"Isoform-specific Co-IP, quantitative proteomics/phosphoproteomics in patient amniocytes, splice-variant RT-PCR and ASO rescue\",\n      \"pmids\": [\"42045457\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise UFL1 region engaged by full-length CDK5RAP3 not structurally defined\", \"How CDK5RAP3 controls UFL1 S462 phosphorylation mechanistically is unresolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Extended CDK5RAP3 to endocrine regulation by showing SMAD4/CEBPB interaction and hCG-driven nuclear translocation place it upstream of BMP signaling in Leydig-cell steroidogenesis.\",\n      \"evidence\": \"IP-MS, AAV-mediated in vivo knockdown, steroidogenic-enzyme Western blot, testosterone ELISA and Noggin epistasis\",\n      \"pmids\": [\"41596239\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect SMAD4/CEBPB binding not dissected\", \"Link between BMP regulation and the UFMylation function unexplored\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how CDK5RAP3's core UFL1/UFMylation adaptor activity mechanistically accounts for its diverse transcriptional, DNA-repair, and signaling roles, and whether these represent independent functions or downstream consequences of disrupted UFMylation.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of CDK5RAP3 with any partner\", \"Substrate selectivity of the UFMylation adaptor not comprehensively mapped\", \"Integration of cytoplasmic vs nuclear functions undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 19]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 9]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [1, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [22, 17, 10]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9, 7, 20]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [5, 19]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [22, 18, 9]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [11, 13]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\"UFM1 conjugation (UFL1) system\"],\n    \"partners\": [\"UFL1\", \"RPL26\", \"UFBP1\", \"BRCA2\", \"HSF1\", \"HSP90\", \"PAK4\", \"STAT3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":6,"faith_pct":83.33333333333333}}