{"gene":"DLGAP1","run_date":"2026-06-09T23:54:42","timeline":{"discoveries":[{"year":1997,"finding":"GKAP (DLGAP1) directly binds the guanylate kinase-like (GK) domain of all four known mammalian PSD-95 family members (PSD-95, SAP97, SAP98, SAP102); GKAP colocalizes and coimmunoprecipitates with PSD-95 in vivo and coclusters with PSD-95 and NMDA receptors/K+ channels in heterologous cells.","method":"Yeast two-hybrid, co-immunoprecipitation from rat brain, heterologous cell coexpression","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct binding confirmed by yeast two-hybrid, in vivo co-IP from rat brain, and heterologous cell reconstitution; replicated across multiple PSD-95 family members","pmids":["9024696"],"is_preprint":false},{"year":1997,"finding":"DAP-1 (DLGAP1) binds the guanylate kinase-like domains of hDLG and PSD-95, and associates with NMDA receptors, APC protein, colocalizing with PSD-95 and NMDA-R at hippocampal synapses.","method":"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence in hippocampal neurons and mouse cerebellum","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP and colocalization in neurons, single lab but multiple orthogonal methods","pmids":["9286858"],"is_preprint":false},{"year":1999,"finding":"Shank binds via its PDZ domain to the C-terminus of GKAP (DLGAP1), forming a ternary Shank/GKAP/PSD-95 complex that can be assembled in heterologous cells and coimmunoprecipitated from rat brain. A GKAP splice variant lacking the Shank-binding C-terminus inhibits synaptic localization of Shank.","method":"Yeast two-hybrid, co-immunoprecipitation from rat brain, heterologous cell reconstitution, neuronal expression of splice variants","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ternary complex reconstituted in cells, co-IP from brain, splice-variant functional test; replicated in multiple assays","pmids":["10433268"],"is_preprint":false},{"year":1999,"finding":"GKAP markedly potentiates the channel activity of the NMDA receptor–PSD-95 complex without affecting basic channel properties or PSD-95-induced channel property changes alone, acting quantitatively via PSD-95.","method":"Electrophysiological channel activity assay in Xenopus oocytes expressing NMDA receptor, PSD-95, and GKAP","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro electrophysiology reconstitution, single lab, single study","pmids":["10570927"],"is_preprint":false},{"year":1999,"finding":"ProSAP1 and ProSAP2 (Shank family) PDZ domains interact with SAPAP/GKAP family proteins, verified by coimmunoprecipitation and cotransfection in HEK cells, providing a link between PSD-95-bound membrane receptors and the cytoskeleton.","method":"Yeast two-hybrid, co-immunoprecipitation, cotransfection in HEK cells","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid plus co-IP and cell cotransfection, single lab","pmids":["10527873"],"is_preprint":false},{"year":2000,"finding":"SAP97 binding to GKAP is regulated by intramolecular interactions within SAP97: the SH3 domain and sequences between SH3 and GUK domains inhibit GKAP binding, while N-terminal sequences facilitate GKAP binding by associating with the SH3 domain. SAP97 can adopt a compact U-shaped conformation that occludes the GKAP-binding GUK domain.","method":"In vitro binding assays, domain deletion/mutation analysis, molecular modeling based on crystal structure data","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple domain deletion/mutation binding assays with structural modeling; single lab but multiple orthogonal approaches","pmids":["11060025"],"is_preprint":false},{"year":2003,"finding":"SAPAP1 (DLGAP1) synaptic targeting is mediated by its N-terminal region and is independent of interaction with PSD-95 or S-SCAM. SAPAP1 influences the synaptic localization of Shank but not PSD-95 or S-SCAM. FRAP analysis revealed SAPAP1 is immobile at synapses, comprising a static core of the PSD.","method":"Expression of SAPAP1 deletion constructs in hippocampal neurons, FRAP (fluorescence recovery after photobleaching), immunofluorescence","journal":"Genes to cells : devoted to molecular & cellular mechanisms","confidence":"High","confidence_rationale":"Tier 2 / Moderate — FRAP plus deletion construct localization in neurons with functional consequence (Shank localization); single lab, multiple orthogonal methods","pmids":["12581155"],"is_preprint":false},{"year":2005,"finding":"SAPK3/p38γ MAP kinase phosphorylates SAP97/hDlg, triggering its dissociation from GKAP (DLGAP1) and release from the cytoskeleton in response to osmotic stress.","method":"Kinase assay, co-immunoprecipitation, phosphorylation-dependent dissociation assay, osmotic stress treatment of cells","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay plus co-IP dissociation in cells; single lab, multiple orthogonal methods identifying GKAP as the cytoskeletal anchor for SAP97 regulated by p38γ","pmids":["15729360"],"is_preprint":false},{"year":2010,"finding":"TRIM3 is an E3 ubiquitin ligase for GKAP/SAPAP1: TRIM3 stimulates ubiquitination and proteasome-dependent degradation of GKAP, reducing GKAP and Shank1 at postsynaptic sites and decreasing dendritic spine head size. RNAi of TRIM3 increases synaptic GKAP and Shank1 and enlarges spine heads, and prevents activity-induced GKAP loss.","method":"Co-immunoprecipitation from rat brain PSD fractions, ubiquitination assay, proteasome inhibitor treatment, RNAi knockdown in neurons, immunofluorescence of dendritic spines","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — co-IP from PSD, ubiquitination assay, RNAi KD with spine morphology readout, activity-dependent rescue; single lab but multiple orthogonal methods","pmids":["20352094"],"is_preprint":false},{"year":2010,"finding":"Dlg1 interacts with dynein via GKAP during wound-induced cell migration; Dlg1, GKAP, and dynein together control microtubule dynamics near the cell cortex and promote centrosome positioning and cell polarity downstream of Cdc42.","method":"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, live-cell imaging of centrosome positioning in migrating cells","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, genetic epistasis with Cdc42/Dlg1, siRNA KD with centrosome positioning readout; single lab, multiple orthogonal methods","pmids":["21041448"],"is_preprint":false},{"year":2011,"finding":"CDK5 phosphorylates GKAP (SAPAP1) directly, leading to its polyubiquitination and proteasomal degradation and collapse of the synaptic actin cytoskeleton in response to amyloid-β via NMDAR activity and Ca2+ influx. GKAP mutants resistant to CDK5 phosphorylation prevent actin cytoskeleton collapse.","method":"In vitro kinase assay (CDK5 on GKAP), ubiquitination assay, pharmacological inhibition of NMDAR/CDK5, expression of phosphorylation-resistant GKAP mutants in rat cortical neurons","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct in vitro kinase assay plus phospho-resistant mutant rescue in neurons; single lab, multiple orthogonal methods","pmids":["21829588"],"is_preprint":false},{"year":2012,"finding":"GKAP-DLC2 (DYNLL2) interaction stabilizes scaffolding protein expression at the PSD and enhances synaptic NMDA receptor activity. The interaction is favored by sustained synaptic activity.","method":"BRET imaging in living neurons, immunostaining, electrophysiological recording of NMDA receptor currents","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 / Moderate — BRET in living neurons plus electrophysiology; single lab, multiple orthogonal methods","pmids":["22328512"],"is_preprint":false},{"year":2012,"finding":"CaMKIIα activated by NMDA receptors phosphorylates GKAP Ser54 to induce polyubiquitination and proteasomal degradation of GKAP (overexcitation-dependent). CaMKIIβ activated via L-type VDCCs phosphorylates GKAP Ser340 and Ser384 to promote GKAP recruitment by uncoupling it from the myosin Va motor complex. Bidirectional changes in synaptic GKAP govern homeostatic synaptic scaling and PSD remodeling.","method":"Site-directed mutagenesis of GKAP phosphorylation sites, CaMKII isoform-specific knockdown/overexpression, ubiquitination assay, immunofluorescence in rat hippocampal neurons, synaptic scaling assay","journal":"Nature neuroscience","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis of specific phosphorylation sites plus multiple isoform-specific KD/OE experiments with defined functional readouts; single lab but multiple highly orthogonal methods","pmids":["23143515"],"is_preprint":false},{"year":2014,"finding":"In dendritic spines, DLC2 (DYNLL2) dimerization is required for interaction with GKAP, which in turn potentiates GKAP self-association. Spines contain large GKAP-DLC2 hetero-oligomers (~16 DLC2 and ~13 GKAP monomers), whereas dendritic shafts contain smaller complexes (~2 DLC2, ~2 GKAP). Disruption of the GKAP-DLC2 interaction destabilizes oligomers, reduces spine-preferential GKAP localization, and inhibits NMDA receptor activity.","method":"Two-photon scanning number and brightness (sN&B) fluorescence fluctuation microscopy in living neurons, BRET, NMDA receptor electrophysiology","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — novel quantitative fluorescence microscopy (sN&B) in living neurons plus BRET and electrophysiology; single lab, multiple orthogonal methods","pmids":["24938595"],"is_preprint":false},{"year":2018,"finding":"GKAP governs invasive growth and NMDAR inhibitor treatment response in pancreatic neuroendocrine tumors via its role in regulating NMDAR pathway activity. Downstream effectors include FMRP and HSF1, which support invasiveness along with GKAP.","method":"Genetic knockdown of GKAP combined with pharmacological NMDAR inhibition, genome-wide expression profiling, in vitro invasion assays","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD plus pharmacological epistasis with defined invasion phenotype and downstream effector identification; single lab","pmids":["29606348"],"is_preprint":false},{"year":2018,"finding":"Dlgap1 knockout mice show disruption of PSD protein interactions (biochemically assessed) and selective deficits in sociability, establishing DLGAP1 as necessary for normal PSD protein complex organization and social behavior.","method":"Knockout mouse model, co-immunoprecipitation/biochemical fractionation of PSD complexes, behavioral battery","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with PSD biochemical disruption and behavioral phenotype; single lab","pmids":["29396406"],"is_preprint":false},{"year":2019,"finding":"DLGAP1 localizes to centrosomes in hematopoietic cells in a cell-cycle-dependent manner; its dissociation from centrosomes is promoted by Jak2, SRC, MAPK, and CDK1 kinases. DLGAP1 negatively affects growth rate of MPL-dependent hematopoietic cells and supports megakaryocytic polyploidization, correlated with centrosomal dissociation.","method":"Retroviral insertional mutagenesis screen, immunofluorescence for centrosomal localization across cell cycle, overexpression/shRNA knockdown in hematopoietic cell lines, flow cytometry for polyploidization","journal":"Biomarker research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional screen plus direct immunofluorescence localization with kinase modulation and polyploidization readout; single lab","pmids":["31321035"],"is_preprint":false},{"year":2024,"finding":"Acute elimination of GKAP (but not PSD-95) reduces postsynaptic scaffold size at individual synapses, demonstrating a direct structural role of GKAP in maintaining PSD scaffold assembly.","method":"Auxin-inducible degron 2 (AID2) technology for acute protein elimination in cultured neurons and in vivo, live imaging of scaffold size","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — acute, reversible elimination with real-time imaging readout; single lab, preprint","pmids":["bio_10.1101_2024.10.20.619267"],"is_preprint":true},{"year":2025,"finding":"The GKAP C-terminal region (Ct43) is intrinsically disordered but binds the Shank1 PDZ domain with micromolar affinity; NMR chemical shifts reveal two regions of helical propensity flanking the PDZ-binding motif.","method":"NMR resonance assignment (1H, 13C, 15N), affinity measurement of Shank1 PDZ binding","journal":"Biomolecular NMR assignments","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structural characterization with binding affinity measurement; single lab, single method per claim","pmids":["41191219"],"is_preprint":false},{"year":2025,"finding":"GKAP forms a well-defined hexameric complex with LC8 (DYNLL): two GKAP molecules and two LC8 dimers. The LC8-binding segment of GKAP is intrinsically disordered and retains substantial flexibility even within the complex; the linker region between the two LC8-binding sites remains flexible.","method":"NMR spectroscopy, molecular dynamics calculations, stoichiometry determination","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural characterization plus MD simulations defining stoichiometry and dynamics; single lab but multiple orthogonal methods","pmids":["40843979"],"is_preprint":false},{"year":2024,"finding":"nArgBP2, GKAP, and SHANK3 form biomolecular condensates with a layered organization: nArgBP2 in the inner phase, SHANK3 in the outer phase, and GKAP partially in both. CaMKIIα activation disperses most condensates and redistributes GKAP and SHANK3 within remaining condensates.","method":"Live-cell fluorescence imaging of condensates in fibroblasts, coexpression of tagged proteins, CaMKIIα activation experiment","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — live-cell imaging of phase-separated condensates with kinase activation perturbation; single lab, multiple protein combinations tested","pmids":["38440150"],"is_preprint":false},{"year":2020,"finding":"Dlgap1 overexpression in brown adipocytes inhibits brown-fat-related gene expression and promotes white-fat-related gene expression, while increasing proliferation and apoptosis. Knockout of Dlgap1 in white fat cells promotes brown-fat gene expression, inhibits white-fat gene expression, and inhibits proliferation and apoptosis while promoting maturation, establishing DLGAP1 as a negative regulator of white adipocyte browning.","method":"Overexpression and knockout in cultured white and brown adipocytes, gene expression analysis, proliferation and apoptosis assays","journal":"Lipids in health and disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, cell culture OE/KO without defined molecular mechanism; no pathway placement beyond gene expression changes","pmids":["32169116"],"is_preprint":false}],"current_model":"DLGAP1/GKAP is a core postsynaptic density scaffold protein that directly binds the GK domain of PSD-95 family MAGUKs via its central region and the PDZ domain of Shank proteins via its C-terminus, thereby bridging the NMDA receptor–PSD-95 complex to the Shank–Homer layer; its synaptic abundance is bidirectionally regulated by CaMKIIα-mediated Ser54 phosphorylation (driving ubiquitination by TRIM3 and proteasomal degradation) and CaMKIIβ-mediated Ser340/Ser384 phosphorylation (uncoupling GKAP from myosin Va to promote synaptic accumulation), and it can also be phosphorylated and degraded by CDK5 in response to amyloid-β; additionally, GKAP forms large oligomeric complexes with dynein light chain DLC2/DYNLL2 in dendritic spines to stabilize PSD organization and enhance NMDA receptor activity, interacts with Dlg1 to regulate dynein–microtubule interactions and centrosome positioning during cell migration, and acute elimination of GKAP reduces postsynaptic scaffold size, underscoring its structural role in maintaining the PSD."},"narrative":{"mechanistic_narrative":"DLGAP1 (GKAP/SAPAP1) is a core scaffolding protein of the postsynaptic density (PSD) that physically bridges the membrane receptor–MAGUK layer to the cytoskeleton-associated Shank–Homer layer [PMID:9024696, PMID:10433268]. Through its central region it directly binds the guanylate kinase-like (GK) domain of all four PSD-95 family MAGUKs (PSD-95, SAP97, SAP98, SAP102), coclustering with these scaffolds and NMDA receptors at excitatory synapses [PMID:9024696, PMID:9286858], and through its intrinsically disordered C-terminus it binds the PDZ domain of Shank/ProSAP proteins to assemble a ternary Shank/GKAP/PSD-95 complex [PMID:10433268, PMID:10527873, PMID:41191219]. GKAP forms a static, immobile core of the PSD whose synaptic targeting is mediated by its N-terminus independently of PSD-95, and which is required to localize Shank [PMID:12581155]; acute elimination of GKAP reduces postsynaptic scaffold size, defining a direct structural role in PSD maintenance [PMID:bio_10.1101_2024.10.20.619267]. Functionally, GKAP potentiates NMDA receptor–PSD-95 channel activity [PMID:10570927], and it self-associates into large hetero-oligomers with the dynein light chain DLC2/DYNLL2 (a defined GKAP–LC8 hexamer of two GKAP and two LC8 dimers) that stabilize PSD scaffolds and enhance NMDA receptor currents in dendritic spines [PMID:22328512, PMID:24938595, PMID:40843979]. Its synaptic abundance is bidirectionally controlled by phosphorylation: CaMKIIα phosphorylation of Ser54 drives TRIM3-mediated ubiquitination and proteasomal degradation, while CaMKIIβ phosphorylation of Ser340/Ser384 uncouples GKAP from the myosin Va motor to promote synaptic accumulation, governing homeostatic synaptic scaling and PSD remodeling [PMID:20352094, PMID:23143515], and CDK5 phosphorylates GKAP to trigger its degradation and actin collapse in response to amyloid-β [PMID:21829588]. Beyond the synapse, GKAP links Dlg1 to dynein to control microtubule dynamics and centrosome positioning during directed cell migration downstream of Cdc42 [PMID:21041448]. Dlgap1 knockout mice show disrupted PSD protein complex organization and selective deficits in sociability, establishing the scaffold as necessary for normal social behavior [PMID:29396406].","teleology":[{"year":1997,"claim":"Established GKAP/DLGAP1 as a direct binding partner of the PSD-95 MAGUK family, answering how an adaptor could be recruited to the NMDA receptor–MAGUK complex.","evidence":"Yeast two-hybrid, co-IP from rat brain, and heterologous coexpression with PSD-95 and NMDA receptors","pmids":["9024696","9286858"],"confidence":"High","gaps":["Did not identify the downstream cytoskeletal coupling","Binding mapped to the GK domain but functional consequence at synapses untested"]},{"year":1999,"claim":"Defined the GKAP C-terminus as the Shank/ProSAP PDZ ligand, showing GKAP bridges PSD-95 to the Shank layer and cytoskeleton.","evidence":"Yeast two-hybrid, co-IP from rat brain, heterologous ternary-complex reconstitution and splice-variant disruption of Shank targeting","pmids":["10433268","10527873"],"confidence":"High","gaps":["Structural basis of the disordered C-terminus binding resolved only later","Stoichiometry of the ternary complex unquantified"]},{"year":1999,"claim":"Showed GKAP is not merely structural but quantitatively potentiates NMDA receptor channel activity via PSD-95.","evidence":"Electrophysiological channel assay in Xenopus oocytes co-expressing NMDAR, PSD-95, and GKAP","pmids":["10570927"],"confidence":"Medium","gaps":["Single in vitro reconstitution system","Mechanism of potentiation not defined"]},{"year":2003,"claim":"Established GKAP as an immobile static core of the PSD with N-terminus-dependent targeting independent of PSD-95.","evidence":"FRAP and deletion-construct localization in hippocampal neurons","pmids":["12581155"],"confidence":"High","gaps":["Molecular identity of the N-terminal targeting receptor unknown","Did not address activity-dependent mobility"]},{"year":2005,"claim":"Revealed that the GKAP–SAP97 interaction is dynamically regulated, with p38γ/SAPK3 phosphorylation of SAP97 dissociating GKAP and releasing it from the cytoskeleton under osmotic stress.","evidence":"Kinase assay and phosphorylation-dependent co-IP dissociation in cells","pmids":["15729360"],"confidence":"High","gaps":["Synaptic relevance of osmotic-stress regulation untested","GKAP itself not the phosphorylated target here"]},{"year":2010,"claim":"Identified TRIM3 as the E3 ligase that ubiquitinates GKAP for proteasomal degradation, coupling GKAP turnover to spine size and activity-induced PSD remodeling.","evidence":"Co-IP from PSD fractions, ubiquitination assay, RNAi with spine-morphology readout","pmids":["20352094"],"confidence":"High","gaps":["Upstream signal triggering TRIM3 activity not defined in this study","Phosphodegron not yet mapped"]},{"year":2010,"claim":"Extended GKAP function beyond the synapse, showing it links Dlg1 to dynein to regulate microtubule dynamics and centrosome positioning in migrating cells downstream of Cdc42.","evidence":"Reciprocal co-IP, siRNA, and live imaging of centrosome positioning in migrating cells","pmids":["21041448"],"confidence":"High","gaps":["Relationship between synaptic and migratory GKAP pools unknown","Whether dynein binding uses the same LC8 interface untested here"]},{"year":2011,"claim":"Demonstrated CDK5-dependent GKAP phosphorylation and degradation as the route by which amyloid-β collapses the synaptic actin cytoskeleton.","evidence":"In vitro CDK5 kinase assay, ubiquitination assay, and phospho-resistant mutant rescue in cortical neurons","pmids":["21829588"],"confidence":"High","gaps":["CDK5 phosphosites not precisely mapped in this entry","Relationship to CaMKII/TRIM3 degradation pathway unresolved"]},{"year":2012,"claim":"Resolved the bidirectional phospho-code controlling GKAP abundance: CaMKIIα/Ser54 drives degradation while CaMKIIβ/Ser340-384 promotes accumulation by releasing GKAP from myosin Va, governing homeostatic scaling.","evidence":"Site-directed mutagenesis, isoform-specific CaMKII KD/OE, ubiquitination and synaptic scaling assays in hippocampal neurons","pmids":["23143515"],"confidence":"High","gaps":["How the same residue selectively engages TRIM3 vs other ligases not fully detailed","In vivo scaling consequences not tested"]},{"year":2014,"claim":"Defined the quantitative architecture of GKAP–DLC2 oligomers in spines, showing DLC2 dimerization potentiates GKAP self-association into large complexes that drive spine-preferential localization and NMDA receptor activity.","evidence":"Two-photon sN&B fluorescence fluctuation microscopy, BRET, and NMDAR electrophysiology in living neurons","pmids":["22328512","24938595"],"confidence":"High","gaps":["High-resolution structure of the oligomer not resolved here","How oligomer size is regulated by activity incompletely defined"]},{"year":2018,"claim":"Linked GKAP to disease contexts: required for normal PSD complex organization and sociability in mice, and a regulator of NMDAR-driven invasive growth in pancreatic neuroendocrine tumors.","evidence":"Knockout mouse with PSD biochemistry and behavior; GKAP knockdown plus NMDAR inhibition with invasion and expression profiling in tumor cells","pmids":["29396406","29606348"],"confidence":"Medium","gaps":["Behavioral specificity and circuit basis not dissected","FMRP/HSF1 mechanistic link to GKAP in tumors correlative"]},{"year":2025,"claim":"Provided structural definition of GKAP's disordered interaction interfaces: a flexible Shank1-PDZ-binding C-terminus with flanking helical propensity, and a defined hexameric GKAP–LC8 complex of two GKAP and two LC8 dimers.","evidence":"NMR resonance assignment, affinity measurement, and MD simulations defining stoichiometry and dynamics","pmids":["41191219","40843979"],"confidence":"Medium","gaps":["Structure of full-length GKAP within the PSD not determined","How disorder enables condensate formation untested in these studies"]},{"year":null,"claim":"It remains unresolved how GKAP's intrinsically disordered regions, oligomerization, and phase behavior integrate with its multiple competing phosphorylation/degradation inputs to set PSD scaffold size in vivo.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No integrated model linking condensate layering, oligomer state, and phospho-regulated turnover","In vivo, time-resolved scaffold dynamics during plasticity not established","Mechanistic distinction between synaptic and non-neuronal (centrosomal/adipocyte) functions unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,2,6]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[6,17]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9,11]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,11]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,6]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[9,10]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[9,16]}],"pathway":[{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[0,2,3]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[12,11]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[8,12,10]}],"complexes":["Shank/GKAP/PSD-95 postsynaptic density complex","GKAP-DLC2/DYNLL2 (LC8) hetero-oligomer","Dlg1-GKAP-dynein complex"],"partners":["DLG4","DLG1","SHANK1","DYNLL2","TRIM3","CAMK2A","CDK5","DLGAP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14490","full_name":"Disks large-associated protein 1","aliases":["Guanylate kinase-associated protein","hGKAP","PSD-95/SAP90-binding protein 1","SAP90/PSD-95-associated protein 1","SAPAP1"],"length_aa":977,"mass_kda":108.9,"function":"Part of the postsynaptic scaffold in neuronal cells","subcellular_location":"Cell membrane; Postsynaptic density; Synapse","url":"https://www.uniprot.org/uniprotkb/O14490/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/DLGAP1","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/DLGAP1","total_profiled":1310},"omim":[{"mim_id":"618597","title":"BRAIN-ENRICHED GUANYLATE KINASE-ASSOCIATED PROTEIN; BEGAIN","url":"https://www.omim.org/entry/618597"},{"mim_id":"617859","title":"DISCS LARGE-ASSOCIATED PROTEIN 5; DLGAP5","url":"https://www.omim.org/entry/617859"},{"mim_id":"616191","title":"DISCS LARGE-ASSOCIATED PROTEIN 4; DLGAP4","url":"https://www.omim.org/entry/616191"},{"mim_id":"611413","title":"DISCS LARGE-ASSOCIATED PROTEIN 3; DLGAP3","url":"https://www.omim.org/entry/611413"},{"mim_id":"611397","title":"TETRATRICOPEPTIDE REPEAT-, ANKYRIN REPEAT-, AND COILED-COIL-CONTAINING PROTEIN 1; TANC1","url":"https://www.omim.org/entry/611397"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Vesicles","reliability":"Additional"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"brain","ntpm":51.7}],"url":"https://www.proteinatlas.org/search/DLGAP1"},"hgnc":{"alias_symbol":["GKAP","SAPAP1","DAP-1"],"prev_symbol":[]},"alphafold":{"accession":"O14490","domains":[{"cath_id":"-","chopping":"794-898","consensus_level":"high","plddt":95.1294,"start":794,"end":898}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14490","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14490-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14490-F1-predicted_aligned_error_v6.png","plddt_mean":50.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=DLGAP1","jax_strain_url":"https://www.jax.org/strain/search?query=DLGAP1"},"sequence":{"accession":"O14490","fasta_url":"https://rest.uniprot.org/uniprotkb/O14490.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14490/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14490"}},"corpus_meta":[{"pmid":"10433268","id":"PMC_10433268","title":"Shank, 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two-hybrid, co-immunoprecipitation from rat brain, heterologous cell coexpression\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct binding confirmed by yeast two-hybrid, in vivo co-IP from rat brain, and heterologous cell reconstitution; replicated across multiple PSD-95 family members\",\n      \"pmids\": [\"9024696\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"DAP-1 (DLGAP1) binds the guanylate kinase-like domains of hDLG and PSD-95, and associates with NMDA receptors, APC protein, colocalizing with PSD-95 and NMDA-R at hippocampal synapses.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, immunofluorescence in hippocampal neurons and mouse cerebellum\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP and colocalization in neurons, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"9286858\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Shank binds via its PDZ domain to the C-terminus of GKAP (DLGAP1), forming a ternary Shank/GKAP/PSD-95 complex that can be assembled in heterologous cells and coimmunoprecipitated from rat brain. A GKAP splice variant lacking the Shank-binding C-terminus inhibits synaptic localization of Shank.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation from rat brain, heterologous cell reconstitution, neuronal expression of splice variants\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ternary complex reconstituted in cells, co-IP from brain, splice-variant functional test; replicated in multiple assays\",\n      \"pmids\": [\"10433268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"GKAP markedly potentiates the channel activity of the NMDA receptor–PSD-95 complex without affecting basic channel properties or PSD-95-induced channel property changes alone, acting quantitatively via PSD-95.\",\n      \"method\": \"Electrophysiological channel activity assay in Xenopus oocytes expressing NMDA receptor, PSD-95, and GKAP\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro electrophysiology reconstitution, single lab, single study\",\n      \"pmids\": [\"10570927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"ProSAP1 and ProSAP2 (Shank family) PDZ domains interact with SAPAP/GKAP family proteins, verified by coimmunoprecipitation and cotransfection in HEK cells, providing a link between PSD-95-bound membrane receptors and the cytoskeleton.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, cotransfection in HEK cells\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid plus co-IP and cell cotransfection, single lab\",\n      \"pmids\": [\"10527873\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"SAP97 binding to GKAP is regulated by intramolecular interactions within SAP97: the SH3 domain and sequences between SH3 and GUK domains inhibit GKAP binding, while N-terminal sequences facilitate GKAP binding by associating with the SH3 domain. SAP97 can adopt a compact U-shaped conformation that occludes the GKAP-binding GUK domain.\",\n      \"method\": \"In vitro binding assays, domain deletion/mutation analysis, molecular modeling based on crystal structure data\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple domain deletion/mutation binding assays with structural modeling; single lab but multiple orthogonal approaches\",\n      \"pmids\": [\"11060025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"SAPAP1 (DLGAP1) synaptic targeting is mediated by its N-terminal region and is independent of interaction with PSD-95 or S-SCAM. SAPAP1 influences the synaptic localization of Shank but not PSD-95 or S-SCAM. FRAP analysis revealed SAPAP1 is immobile at synapses, comprising a static core of the PSD.\",\n      \"method\": \"Expression of SAPAP1 deletion constructs in hippocampal neurons, FRAP (fluorescence recovery after photobleaching), immunofluorescence\",\n      \"journal\": \"Genes to cells : devoted to molecular & cellular mechanisms\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — FRAP plus deletion construct localization in neurons with functional consequence (Shank localization); single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12581155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SAPK3/p38γ MAP kinase phosphorylates SAP97/hDlg, triggering its dissociation from GKAP (DLGAP1) and release from the cytoskeleton in response to osmotic stress.\",\n      \"method\": \"Kinase assay, co-immunoprecipitation, phosphorylation-dependent dissociation assay, osmotic stress treatment of cells\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay plus co-IP dissociation in cells; single lab, multiple orthogonal methods identifying GKAP as the cytoskeletal anchor for SAP97 regulated by p38γ\",\n      \"pmids\": [\"15729360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"TRIM3 is an E3 ubiquitin ligase for GKAP/SAPAP1: TRIM3 stimulates ubiquitination and proteasome-dependent degradation of GKAP, reducing GKAP and Shank1 at postsynaptic sites and decreasing dendritic spine head size. RNAi of TRIM3 increases synaptic GKAP and Shank1 and enlarges spine heads, and prevents activity-induced GKAP loss.\",\n      \"method\": \"Co-immunoprecipitation from rat brain PSD fractions, ubiquitination assay, proteasome inhibitor treatment, RNAi knockdown in neurons, immunofluorescence of dendritic spines\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP from PSD, ubiquitination assay, RNAi KD with spine morphology readout, activity-dependent rescue; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"20352094\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Dlg1 interacts with dynein via GKAP during wound-induced cell migration; Dlg1, GKAP, and dynein together control microtubule dynamics near the cell cortex and promote centrosome positioning and cell polarity downstream of Cdc42.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, immunofluorescence, live-cell imaging of centrosome positioning in migrating cells\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, genetic epistasis with Cdc42/Dlg1, siRNA KD with centrosome positioning readout; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21041448\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CDK5 phosphorylates GKAP (SAPAP1) directly, leading to its polyubiquitination and proteasomal degradation and collapse of the synaptic actin cytoskeleton in response to amyloid-β via NMDAR activity and Ca2+ influx. GKAP mutants resistant to CDK5 phosphorylation prevent actin cytoskeleton collapse.\",\n      \"method\": \"In vitro kinase assay (CDK5 on GKAP), ubiquitination assay, pharmacological inhibition of NMDAR/CDK5, expression of phosphorylation-resistant GKAP mutants in rat cortical neurons\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct in vitro kinase assay plus phospho-resistant mutant rescue in neurons; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"21829588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GKAP-DLC2 (DYNLL2) interaction stabilizes scaffolding protein expression at the PSD and enhances synaptic NMDA receptor activity. The interaction is favored by sustained synaptic activity.\",\n      \"method\": \"BRET imaging in living neurons, immunostaining, electrophysiological recording of NMDA receptor currents\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BRET in living neurons plus electrophysiology; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"22328512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CaMKIIα activated by NMDA receptors phosphorylates GKAP Ser54 to induce polyubiquitination and proteasomal degradation of GKAP (overexcitation-dependent). CaMKIIβ activated via L-type VDCCs phosphorylates GKAP Ser340 and Ser384 to promote GKAP recruitment by uncoupling it from the myosin Va motor complex. Bidirectional changes in synaptic GKAP govern homeostatic synaptic scaling and PSD remodeling.\",\n      \"method\": \"Site-directed mutagenesis of GKAP phosphorylation sites, CaMKII isoform-specific knockdown/overexpression, ubiquitination assay, immunofluorescence in rat hippocampal neurons, synaptic scaling assay\",\n      \"journal\": \"Nature neuroscience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis of specific phosphorylation sites plus multiple isoform-specific KD/OE experiments with defined functional readouts; single lab but multiple highly orthogonal methods\",\n      \"pmids\": [\"23143515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"In dendritic spines, DLC2 (DYNLL2) dimerization is required for interaction with GKAP, which in turn potentiates GKAP self-association. Spines contain large GKAP-DLC2 hetero-oligomers (~16 DLC2 and ~13 GKAP monomers), whereas dendritic shafts contain smaller complexes (~2 DLC2, ~2 GKAP). Disruption of the GKAP-DLC2 interaction destabilizes oligomers, reduces spine-preferential GKAP localization, and inhibits NMDA receptor activity.\",\n      \"method\": \"Two-photon scanning number and brightness (sN&B) fluorescence fluctuation microscopy in living neurons, BRET, NMDA receptor electrophysiology\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — novel quantitative fluorescence microscopy (sN&B) in living neurons plus BRET and electrophysiology; single lab, multiple orthogonal methods\",\n      \"pmids\": [\"24938595\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"GKAP governs invasive growth and NMDAR inhibitor treatment response in pancreatic neuroendocrine tumors via its role in regulating NMDAR pathway activity. Downstream effectors include FMRP and HSF1, which support invasiveness along with GKAP.\",\n      \"method\": \"Genetic knockdown of GKAP combined with pharmacological NMDAR inhibition, genome-wide expression profiling, in vitro invasion assays\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD plus pharmacological epistasis with defined invasion phenotype and downstream effector identification; single lab\",\n      \"pmids\": [\"29606348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Dlgap1 knockout mice show disruption of PSD protein interactions (biochemically assessed) and selective deficits in sociability, establishing DLGAP1 as necessary for normal PSD protein complex organization and social behavior.\",\n      \"method\": \"Knockout mouse model, co-immunoprecipitation/biochemical fractionation of PSD complexes, behavioral battery\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with PSD biochemical disruption and behavioral phenotype; single lab\",\n      \"pmids\": [\"29396406\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"DLGAP1 localizes to centrosomes in hematopoietic cells in a cell-cycle-dependent manner; its dissociation from centrosomes is promoted by Jak2, SRC, MAPK, and CDK1 kinases. DLGAP1 negatively affects growth rate of MPL-dependent hematopoietic cells and supports megakaryocytic polyploidization, correlated with centrosomal dissociation.\",\n      \"method\": \"Retroviral insertional mutagenesis screen, immunofluorescence for centrosomal localization across cell cycle, overexpression/shRNA knockdown in hematopoietic cell lines, flow cytometry for polyploidization\",\n      \"journal\": \"Biomarker research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional screen plus direct immunofluorescence localization with kinase modulation and polyploidization readout; single lab\",\n      \"pmids\": [\"31321035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Acute elimination of GKAP (but not PSD-95) reduces postsynaptic scaffold size at individual synapses, demonstrating a direct structural role of GKAP in maintaining PSD scaffold assembly.\",\n      \"method\": \"Auxin-inducible degron 2 (AID2) technology for acute protein elimination in cultured neurons and in vivo, live imaging of scaffold size\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — acute, reversible elimination with real-time imaging readout; single lab, preprint\",\n      \"pmids\": [\"bio_10.1101_2024.10.20.619267\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The GKAP C-terminal region (Ct43) is intrinsically disordered but binds the Shank1 PDZ domain with micromolar affinity; NMR chemical shifts reveal two regions of helical propensity flanking the PDZ-binding motif.\",\n      \"method\": \"NMR resonance assignment (1H, 13C, 15N), affinity measurement of Shank1 PDZ binding\",\n      \"journal\": \"Biomolecular NMR assignments\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structural characterization with binding affinity measurement; single lab, single method per claim\",\n      \"pmids\": [\"41191219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GKAP forms a well-defined hexameric complex with LC8 (DYNLL): two GKAP molecules and two LC8 dimers. The LC8-binding segment of GKAP is intrinsically disordered and retains substantial flexibility even within the complex; the linker region between the two LC8-binding sites remains flexible.\",\n      \"method\": \"NMR spectroscopy, molecular dynamics calculations, stoichiometry determination\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural characterization plus MD simulations defining stoichiometry and dynamics; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"40843979\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"nArgBP2, GKAP, and SHANK3 form biomolecular condensates with a layered organization: nArgBP2 in the inner phase, SHANK3 in the outer phase, and GKAP partially in both. CaMKIIα activation disperses most condensates and redistributes GKAP and SHANK3 within remaining condensates.\",\n      \"method\": \"Live-cell fluorescence imaging of condensates in fibroblasts, coexpression of tagged proteins, CaMKIIα activation experiment\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — live-cell imaging of phase-separated condensates with kinase activation perturbation; single lab, multiple protein combinations tested\",\n      \"pmids\": [\"38440150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Dlgap1 overexpression in brown adipocytes inhibits brown-fat-related gene expression and promotes white-fat-related gene expression, while increasing proliferation and apoptosis. Knockout of Dlgap1 in white fat cells promotes brown-fat gene expression, inhibits white-fat gene expression, and inhibits proliferation and apoptosis while promoting maturation, establishing DLGAP1 as a negative regulator of white adipocyte browning.\",\n      \"method\": \"Overexpression and knockout in cultured white and brown adipocytes, gene expression analysis, proliferation and apoptosis assays\",\n      \"journal\": \"Lipids in health and disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, cell culture OE/KO without defined molecular mechanism; no pathway placement beyond gene expression changes\",\n      \"pmids\": [\"32169116\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"DLGAP1/GKAP is a core postsynaptic density scaffold protein that directly binds the GK domain of PSD-95 family MAGUKs via its central region and the PDZ domain of Shank proteins via its C-terminus, thereby bridging the NMDA receptor–PSD-95 complex to the Shank–Homer layer; its synaptic abundance is bidirectionally regulated by CaMKIIα-mediated Ser54 phosphorylation (driving ubiquitination by TRIM3 and proteasomal degradation) and CaMKIIβ-mediated Ser340/Ser384 phosphorylation (uncoupling GKAP from myosin Va to promote synaptic accumulation), and it can also be phosphorylated and degraded by CDK5 in response to amyloid-β; additionally, GKAP forms large oligomeric complexes with dynein light chain DLC2/DYNLL2 in dendritic spines to stabilize PSD organization and enhance NMDA receptor activity, interacts with Dlg1 to regulate dynein–microtubule interactions and centrosome positioning during cell migration, and acute elimination of GKAP reduces postsynaptic scaffold size, underscoring its structural role in maintaining the PSD.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"DLGAP1 (GKAP/SAPAP1) is a core scaffolding protein of the postsynaptic density (PSD) that physically bridges the membrane receptor\\u2013MAGUK layer to the cytoskeleton-associated Shank\\u2013Homer layer [#0, #2]. Through its central region it directly binds the guanylate kinase-like (GK) domain of all four PSD-95 family MAGUKs (PSD-95, SAP97, SAP98, SAP102), coclustering with these scaffolds and NMDA receptors at excitatory synapses [#0, #1], and through its intrinsically disordered C-terminus it binds the PDZ domain of Shank/ProSAP proteins to assemble a ternary Shank/GKAP/PSD-95 complex [#2, #4, #18]. GKAP forms a static, immobile core of the PSD whose synaptic targeting is mediated by its N-terminus independently of PSD-95, and which is required to localize Shank [#6]; acute elimination of GKAP reduces postsynaptic scaffold size, defining a direct structural role in PSD maintenance [#17]. Functionally, GKAP potentiates NMDA receptor\\u2013PSD-95 channel activity [#3], and it self-associates into large hetero-oligomers with the dynein light chain DLC2/DYNLL2 (a defined GKAP\\u2013LC8 hexamer of two GKAP and two LC8 dimers) that stabilize PSD scaffolds and enhance NMDA receptor currents in dendritic spines [#11, #13, #19]. Its synaptic abundance is bidirectionally controlled by phosphorylation: CaMKII\\u03b1 phosphorylation of Ser54 drives TRIM3-mediated ubiquitination and proteasomal degradation, while CaMKII\\u03b2 phosphorylation of Ser340/Ser384 uncouples GKAP from the myosin Va motor to promote synaptic accumulation, governing homeostatic synaptic scaling and PSD remodeling [#8, #12], and CDK5 phosphorylates GKAP to trigger its degradation and actin collapse in response to amyloid-\\u03b2 [#10]. Beyond the synapse, GKAP links Dlg1 to dynein to control microtubule dynamics and centrosome positioning during directed cell migration downstream of Cdc42 [#9]. Dlgap1 knockout mice show disrupted PSD protein complex organization and selective deficits in sociability, establishing the scaffold as necessary for normal social behavior [#15].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Established GKAP/DLGAP1 as a direct binding partner of the PSD-95 MAGUK family, answering how an adaptor could be recruited to the NMDA receptor\\u2013MAGUK complex.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP from rat brain, and heterologous coexpression with PSD-95 and NMDA receptors\",\n      \"pmids\": [\"9024696\", \"9286858\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the downstream cytoskeletal coupling\", \"Binding mapped to the GK domain but functional consequence at synapses untested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defined the GKAP C-terminus as the Shank/ProSAP PDZ ligand, showing GKAP bridges PSD-95 to the Shank layer and cytoskeleton.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP from rat brain, heterologous ternary-complex reconstitution and splice-variant disruption of Shank targeting\",\n      \"pmids\": [\"10433268\", \"10527873\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the disordered C-terminus binding resolved only later\", \"Stoichiometry of the ternary complex unquantified\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed GKAP is not merely structural but quantitatively potentiates NMDA receptor channel activity via PSD-95.\",\n      \"evidence\": \"Electrophysiological channel assay in Xenopus oocytes co-expressing NMDAR, PSD-95, and GKAP\",\n      \"pmids\": [\"10570927\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single in vitro reconstitution system\", \"Mechanism of potentiation not defined\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established GKAP as an immobile static core of the PSD with N-terminus-dependent targeting independent of PSD-95.\",\n      \"evidence\": \"FRAP and deletion-construct localization in hippocampal neurons\",\n      \"pmids\": [\"12581155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the N-terminal targeting receptor unknown\", \"Did not address activity-dependent mobility\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Revealed that the GKAP\\u2013SAP97 interaction is dynamically regulated, with p38\\u03b3/SAPK3 phosphorylation of SAP97 dissociating GKAP and releasing it from the cytoskeleton under osmotic stress.\",\n      \"evidence\": \"Kinase assay and phosphorylation-dependent co-IP dissociation in cells\",\n      \"pmids\": [\"15729360\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Synaptic relevance of osmotic-stress regulation untested\", \"GKAP itself not the phosphorylated target here\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified TRIM3 as the E3 ligase that ubiquitinates GKAP for proteasomal degradation, coupling GKAP turnover to spine size and activity-induced PSD remodeling.\",\n      \"evidence\": \"Co-IP from PSD fractions, ubiquitination assay, RNAi with spine-morphology readout\",\n      \"pmids\": [\"20352094\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream signal triggering TRIM3 activity not defined in this study\", \"Phosphodegron not yet mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Extended GKAP function beyond the synapse, showing it links Dlg1 to dynein to regulate microtubule dynamics and centrosome positioning in migrating cells downstream of Cdc42.\",\n      \"evidence\": \"Reciprocal co-IP, siRNA, and live imaging of centrosome positioning in migrating cells\",\n      \"pmids\": [\"21041448\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between synaptic and migratory GKAP pools unknown\", \"Whether dynein binding uses the same LC8 interface untested here\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated CDK5-dependent GKAP phosphorylation and degradation as the route by which amyloid-\\u03b2 collapses the synaptic actin cytoskeleton.\",\n      \"evidence\": \"In vitro CDK5 kinase assay, ubiquitination assay, and phospho-resistant mutant rescue in cortical neurons\",\n      \"pmids\": [\"21829588\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"CDK5 phosphosites not precisely mapped in this entry\", \"Relationship to CaMKII/TRIM3 degradation pathway unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Resolved the bidirectional phospho-code controlling GKAP abundance: CaMKII\\u03b1/Ser54 drives degradation while CaMKII\\u03b2/Ser340-384 promotes accumulation by releasing GKAP from myosin Va, governing homeostatic scaling.\",\n      \"evidence\": \"Site-directed mutagenesis, isoform-specific CaMKII KD/OE, ubiquitination and synaptic scaling assays in hippocampal neurons\",\n      \"pmids\": [\"23143515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the same residue selectively engages TRIM3 vs other ligases not fully detailed\", \"In vivo scaling consequences not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined the quantitative architecture of GKAP\\u2013DLC2 oligomers in spines, showing DLC2 dimerization potentiates GKAP self-association into large complexes that drive spine-preferential localization and NMDA receptor activity.\",\n      \"evidence\": \"Two-photon sN&B fluorescence fluctuation microscopy, BRET, and NMDAR electrophysiology in living neurons\",\n      \"pmids\": [\"22328512\", \"24938595\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"High-resolution structure of the oligomer not resolved here\", \"How oligomer size is regulated by activity incompletely defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Linked GKAP to disease contexts: required for normal PSD complex organization and sociability in mice, and a regulator of NMDAR-driven invasive growth in pancreatic neuroendocrine tumors.\",\n      \"evidence\": \"Knockout mouse with PSD biochemistry and behavior; GKAP knockdown plus NMDAR inhibition with invasion and expression profiling in tumor cells\",\n      \"pmids\": [\"29396406\", \"29606348\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Behavioral specificity and circuit basis not dissected\", \"FMRP/HSF1 mechanistic link to GKAP in tumors correlative\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Provided structural definition of GKAP's disordered interaction interfaces: a flexible Shank1-PDZ-binding C-terminus with flanking helical propensity, and a defined hexameric GKAP\\u2013LC8 complex of two GKAP and two LC8 dimers.\",\n      \"evidence\": \"NMR resonance assignment, affinity measurement, and MD simulations defining stoichiometry and dynamics\",\n      \"pmids\": [\"41191219\", \"40843979\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structure of full-length GKAP within the PSD not determined\", \"How disorder enables condensate formation untested in these studies\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how GKAP's intrinsically disordered regions, oligomerization, and phase behavior integrate with its multiple competing phosphorylation/degradation inputs to set PSD scaffold size in vivo.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No integrated model linking condensate layering, oligomer state, and phospho-regulated turnover\", \"In vivo, time-resolved scaffold dynamics during plasticity not established\", \"Mechanistic distinction between synaptic and non-neuronal (centrosomal/adipocyte) functions unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 2, 6]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [6, 17]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9, 11]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 10]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [9, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [0, 2, 3]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [12, 11]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [8, 12, 10]}\n    ],\n    \"complexes\": [\n      \"Shank/GKAP/PSD-95 postsynaptic density complex\",\n      \"GKAP-DLC2/DYNLL2 (LC8) hetero-oligomer\",\n      \"Dlg1-GKAP-dynein complex\"\n    ],\n    \"partners\": [\n      \"DLG4\",\n      \"DLG1\",\n      \"SHANK1\",\n      \"DYNLL2\",\n      \"TRIM3\",\n      \"CAMK2A\",\n      \"CDK5\",\n      \"DLGAP1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}