{"gene":"CTBP1","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2003,"finding":"Crystal structure of rat CtBP/BARS in binary complex with NAD(H) and ternary complex with a PXDLS peptide revealed that CtBP/BARS forms a NAD(H)-bound dimer; the peptide-binding site maps the recognition interface for DNA-binding proteins and histone deacetylases to an N-terminal region; site-directed mutagenesis supported the structural data and provided a molecular basis for the two co-existing activities (transcriptional co-repression and acyl-CoA-dependent membrane fission).","method":"X-ray crystallography, site-directed mutagenesis, binding experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis and binding experiments in one rigorous study","pmids":["12805226"],"is_preprint":false},{"year":2007,"finding":"Structure-based functional dissection of CtBP1 showed that the PLDLS-binding hydrophobic cleft is the primary recruitment center for DNA-binding repressors and for the core enzymatic components HDAC1/2, CoREST/LSD1, and Ubc9 (E2 SUMO ligase), which interact via non-PLDLS contacts. HDACs contribute predominantly to CtBP1 repression activity. NAD(H)-dependent dimerization (not dehydrogenase activity) is required for transcriptional repression. CtBP1 also serves as a platform for sumoylation of cofactors. Auxiliary components (G9a/Wiz/CDYL HMTase complex, PIAS1, HPC2) interact with the PLDLS cleft and are displaced by E1A-PLDLS.","method":"Structure-based mutagenesis, co-immunoprecipitation, transcriptional repression assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — structure-guided mutagenesis combined with multiple co-IP and functional assays in one study","pmids":["17967884"],"is_preprint":false},{"year":2013,"finding":"NAD(H)-dependent multimerization of CtBP1 proceeds through a dimeric intermediate to a tetramer; Trp318 acts as a switch for dimerization upon NAD(+) binding; the C-terminus is required for dimer-of-dimers formation. NAD(H)-binding mutants do not self-associate in vitro or in vivo but retain PXDLS-motif binding. Transcriptional repression depends on the N-terminal domain recruiting PXDLS-containing targets, not on NAD binding or dehydrogenase activity per se.","method":"In vitro biochemical oligomerization assays, co-immunoprecipitation, mammalian two-hybrid, mutagenesis, transcriptional reporter assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal biochemical methods (in vitro assembly, co-IP, two-hybrid, reporters) with systematic mutagenesis","pmids":["23940047"],"is_preprint":false},{"year":2005,"finding":"CtBP3/BARS (the short isoform of CtBP1) controls membrane fission in basolateral transport from the Golgi to the plasma membrane and in fluid-phase endocytosis, but is inactive in apical transport and receptor-mediated endocytosis (both controlled by dynamin), establishing that CtBP1/BARS and dynamin define distinct, non-overlapping fission machineries.","method":"Dominant-negative protein expression, RNAi, live-cell and electron microscopy, transport assays in intact cells","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple experimental approaches (RNAi, dominant-negative, EM, transport assays) with clear mechanistic pathway placement","pmids":["15880102"],"is_preprint":false},{"year":2005,"finding":"The proposed lysophosphatidic acid acyltransferase (LPAAT) activity of CtBP/BARS, previously suggested to drive membrane fission by changing bilayer curvature, was shown to be a co-purification artefact; purified CtBP/BARS has no intrinsic LPAAT activity.","method":"In vitro LPAAT enzymatic assay with purified proteins and appropriate controls","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous in vitro enzymatic reconstitution demonstrating the activity is an artefact; published in Nature","pmids":["16319893"],"is_preprint":false},{"year":2008,"finding":"Upon EGF receptor activation, CtBP1/BARS translocates to macropinocytic cups, is phosphorylated by PAK1 at a specific serine residue (identified as the PAK substrate site), and this phosphorylation is essential for fission of the macropinocytic cup; CtBP1/BARS is also required for echovirus 1 macropinocytic internalization.","method":"Live-cell fluorescence microscopy, pharmacological inhibition, phosphorylation site mutagenesis, RNAi, viral infection assay","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — mutagenesis of phosphorylation site combined with live imaging and functional fission assay in one study; independently corroborated by PMID 18323776","pmids":["18354494"],"is_preprint":false},{"year":2008,"finding":"Ad3 infectious macropinocytosis requires viral activation of PAK1, which phosphorylates CtBP1 at S147; a phosphorylation-defective S147A-CtBP1 mutant blocks Ad3 but not Ad5 infection, directly linking PAK1 phosphorylation of CtBP1 to Ad3 macropinocytic entry.","method":"Dominant-negative mutant overexpression, pharmacological inhibition, viral infection assays, co-localization microscopy","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — phosphorylation-defective mutant provides direct mechanistic link; replicated PAK1–CtBP1 phosphorylation finding from PMID 18354494","pmids":["18323776"],"is_preprint":false},{"year":2009,"finding":"CtBP1/BARS is a physiological activator of phospholipase D1 (PLD1); EGF or serum stimulation induces association of CtBP1/BARS with PLD1, and CtBP1/BARS activates PLD1 synergistically with ARF GTPases in vitro and in cells. 1-Butanol (PLD product inhibitor) blocks EGF-induced macropinocytosis, placing CtBP1/BARS–PLD1 activation upstream of macropinosome formation.","method":"Co-immunoprecipitation, in vitro PLD activity assay, intact-cell PLD assay, pharmacological inhibition","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro enzymatic assay plus co-IP plus intact-cell assay, single lab with multiple orthogonal methods","pmids":["19322195"],"is_preprint":false},{"year":2012,"finding":"14-3-3γ dimers bridge CtBP1-S/BARS with PI(4)KIIIβ to form a complex that couples Golgi carrier budding and fission; the complex is stabilized by PKD and PAK phosphorylation, and disrupting CtBP1-S/BARS association with 14-3-3γ or PI(4)KIIIβ inhibits fission of elongating post-Golgi carrier precursors.","method":"Co-immunoprecipitation, dominant-negative constructs, RNAi, live-cell imaging, electron microscopy","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, functional disruption, and imaging in one study published in Nature Cell Biology","pmids":["22366688"],"is_preprint":false},{"year":2013,"finding":"BFA induces ADP-ribosylation of CtBP1-S/BARS via a two-step mechanism: CD38 (ADP-ribosyl cyclase) synthesizes a BFA-ADP-ribose conjugate, which then covalently inserts into the CtBP1-S/BARS NAD(+)-binding pocket. This locks CtBP1-S/BARS in a dimer conformation, prevents binding to membrane fission interactors, and inhibits mitotic Golgi partitioning, arresting cells in G2.","method":"Mass spectrometry, biochemical ADP-ribosylation assays, mutagenesis, cell-cycle analysis, co-immunoprecipitation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical mechanism resolved by MS and mutagenesis with functional cell-cycle readout","pmids":["23716697"],"is_preprint":false},{"year":2016,"finding":"When incorporated into the 14-3-3γ/PI4KIIIβ/ARF/PKD/PAK complex at the trans-Golgi, CtBP1-S/BARS binds to and activates LPA acyltransferase δ (LPAATδ), converting LPA to phosphatidic acid (PA); this LPA-to-PA conversion is essential for fission of post-Golgi carriers.","method":"Co-immunoprecipitation, in vitro acyltransferase activity assay, RNAi, transport assays, lipidomics","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro enzymatic assay combined with co-IP, RNAi rescue, and functional transport assays","pmids":["27401954"],"is_preprint":false},{"year":2009,"finding":"Crystal structure of the NAD(H)-free G172E CtBP1/BARS mutant reveals that absence of NAD(H) causes flexibility and backbone conformational changes at the dimerization interface and interdomain region, explaining how NAD(H) binding promotes functional dimerization.","method":"X-ray crystallography, size-exclusion chromatography","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with biochemical validation, single lab but rigorous structural method","pmids":["19351597"],"is_preprint":false},{"year":2007,"finding":"Mono-ADP-ribosylation of CtBP1/BARS (induced by BFA) inactivates its transcriptional repressor function, leading to activation of genes that regulate neutral lipid storage; siRNA knockdown of CtBP1/BARS mimics BFA-induced lipid droplet loss, and CtBP1/BARS-deficient MEFs are defective in lipid accumulation.","method":"siRNA knockdown, BFA treatment, ribosylation inhibitors, lipid droplet microscopy, MEF knockout cells","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA phenocopy of BFA effect with multiple inhibitors, single lab","pmids":["17538025"],"is_preprint":false},{"year":1999,"finding":"CtBP1 (and CtBP2) acts as a corepressor of the zinc finger-homeodomain transcription factor deltaEF1; interaction is mediated by the PLDLSL sequence in deltaEF1; exogenous CtBP1/2 enhances deltaEF1-mediated transcriptional repression and this enhancement is abolished when the PLDLSL motif is mutated.","method":"Yeast two-hybrid, co-immunoprecipitation, Gal4-fusion transcriptional repression assays, mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP and functional transcriptional assays with mutagenesis in one study","pmids":["10567582"],"is_preprint":false},{"year":2008,"finding":"SATB1 interacts with CtBP1 via the PVPLS motif within SATB1's PDZ-like domain to form a repressor complex in vivo; acetylation of SATB1 (induced by LiCl/ionomycin) disrupts its association with CtBP1, leading to derepression of target genes (IL-2, c-Myc promoters) and reduced CtBP1 and HDAC1 chromatin occupancy.","method":"Co-immunoprecipitation, chromatin immunoprecipitation, gene expression profiling, mutagenesis","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, ChIP, and functional readout with acetylation-dependent mechanism; single lab but multiple orthogonal methods","pmids":["19103759"],"is_preprint":false},{"year":2008,"finding":"PKA (activated by ACTH/cAMP signaling) phosphorylates CtBP1 at T144, stimulating partnering of CtBP1 with CtBP2 and modulating ACTH-dependent CYP17 transcription; both ACTH/cAMP signaling and NADH/NAD+ ratio changes drive nuclear-cytoplasmic oscillation of CtBP proteins.","method":"Phosphorylation site mutagenesis, co-immunoprecipitation, transcriptional reporter assays, pharmacological manipulation of cAMP","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphorylation site identified and mutated with functional transcriptional readout; single lab","pmids":["18184656"],"is_preprint":false},{"year":2010,"finding":"Akt1 phosphorylates CtBP1 (promoted by the SUMO E3 ligase Pc2/Cbx4 which recruits Akt1 and prevents its dephosphorylation); Akt1-mediated phosphorylation of CtBP1 decreases its dimerization, targets it for poly-ubiquitylation and proteasomal degradation, and reduces transcriptional repression.","method":"Co-immunoprecipitation, phospho-specific analysis, mutagenesis (phosphomimetic), ubiquitylation assay, stability assays, transcriptional reporter","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP with multiple functional assays (dimerization, ubiquitylation, stability, transcription), single lab","pmids":["20361981"],"is_preprint":false},{"year":2017,"finding":"FBXO32 (an E3 ubiquitin ligase) directly ubiquitinates CtBP1, which is required for CtBP1 stability and nuclear retention; this ubiquitination is essential for epigenetic remodeling and transcriptional induction of CtBP1 target genes that create a microenvironment permissive for EMT.","method":"Co-immunoprecipitation, ubiquitination assay, nuclear fractionation, ChIP, siRNA knockdown, xenograft model","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ubiquitination demonstrated biochemically with nuclear localization and functional transcriptional readout; single lab","pmids":["29142217"],"is_preprint":false},{"year":2015,"finding":"CtBP1 is present in both presynaptic and nuclear pools of neurons; it is anchored to presynapses by direct interaction with active zone scaffolding proteins Bassoon and Piccolo; synaptic retention and nuclear shuttling of CtBP1 are co-regulated by neuronal activity via modulation of cellular NAD/NADH levels, thereby coupling presynaptic activity to nuclear gene expression.","method":"Co-immunoprecipitation, live-cell imaging, subcellular fractionation, NAD/NADH manipulation, knockdown experiments","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct interaction demonstrated by co-IP with functional link between localization and gene expression via NAD/NADH; single lab with multiple orthogonal methods","pmids":["25652077"],"is_preprint":false},{"year":2020,"finding":"Presynaptic CtBP1 facilitates compensatory endocytosis of synaptic vesicles via its membrane-fission activity; in CtBP1-null hippocampal neurons, recycling of synaptic vesicles is impaired. Rescue experiments with targeted constructs showed that while synaptogenesis and release probability are controlled by nuclear CtBP1, efficient SV recycling depends on synaptic CtBP1 and requires activation of PLD1.","method":"Knockout neurons, targeted rescue constructs, electrophysiology, live-cell fluorescence imaging","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with targeted rescue dissecting nuclear vs. synaptic function, multiple readouts","pmids":["32075774"],"is_preprint":false},{"year":2009,"finding":"CtBP1 represses Brca1 transcription by binding to the E2F4 site of the Brca1 promoter in a redox-dependent manner: CtBP1 recruitment is increased at high NADH levels (hypoxic conditions), and pharmacological reduction of NADH with Tempol relieves CtBP1-mediated Brca1 repression and increases DNA repair.","method":"Chromatin immunoprecipitation, reporter assay, NADH manipulation, siRNA knockdown, tissue array immunostaining","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter with NADH-dependent functional rescue; single lab","pmids":["20818429"],"is_preprint":false},{"year":2009,"finding":"Agonist-bound ERalpha recruits the corepressor CtBP1 (via p300, a p300-interacting partner) to early estrogen-repressed genes, driving chromatin modifications leading to transcriptional repression; p300 knockdown prevents estrogen-mediated gene repression.","method":"Chromatin immunoprecipitation, siRNA knockdown, gene expression analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and knockdown with functional readout; single lab","pmids":["19188451"],"is_preprint":false},{"year":2014,"finding":"ZNF750 interacts with chromatin regulators RCOR1, KDM1A, and CTBP1/2 through conserved PLNLS sequences; KDM1A colocalizes with ZNF750 at progenitor genes to facilitate their repression, while KLF4 colocalizes at differentiation genes for activation; CTBP1/2 and RCOR1 participate in both regulatory modes.","method":"Co-immunoprecipitation, ChIP-seq, gene depletion (RNAi)","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus ChIP-seq with gene depletion; single lab","pmids":["25228645"],"is_preprint":false},{"year":2010,"finding":"Bcl3 interacts with CtBP1 via a PXDLS/R motif embedded in Bcl3, stabilizing CtBP1 by blocking proteasome-dependent degradation; this stabilization sustains CtBP1-mediated repression of pro-apoptotic genes and inhibits apoptosis.","method":"Proteomic (co-IP/MS), co-immunoprecipitation, proteasome inhibitor assay, apoptosis assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification confirmed by co-IP with PXDLS motif mapping and stability assay; single lab","pmids":["20800578"],"is_preprint":false},{"year":2019,"finding":"The pathogenic de novo R342W CtBP1 mutation (located in the PLDLS-binding cleft) reduces interaction with several chromatin-modifying factors as shown by unbiased proteomics; genome-wide transcriptome changes occur in cells expressing the mutant; patient-derived fibroblasts show enhanced apoptosis during glucose deprivation linked to upregulation of NOXA.","method":"Unbiased proteomic (co-IP/MS), RNA-seq, patient-derived fibroblast functional assays","journal":"Neurogenetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic interaction profiling plus transcriptome analysis and patient cell functional assay; single study","pmids":["31041561"],"is_preprint":false},{"year":2013,"finding":"FANCC (Fanconi anemia group C protein) and other FA core complex proteins interact directly with CtBP1; CtBP1 is essential for proliferation, cell survival, and chromosomal integrity in FA cells; expression profiling of CtBP1-depleted and FA-depleted cells identified commonly regulated genes including the Wnt antagonist DKK1.","method":"Co-immunoprecipitation, siRNA knockdown, expression profiling","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-IP interaction with functional knockdown readout; single lab","pmids":["23303816"],"is_preprint":false},{"year":2012,"finding":"CtBP1 interacts with Ikaros isoforms in pituitary tumor cells; CtBP1 deficiency up-regulates Sprouty2 and down-regulates Enpp2; CtBP1-deficient pituitary cells are more susceptible to hypoxia-induced apoptosis, rescued by Enpp2-derived lysophosphatidic acid treatment.","method":"Co-immunoprecipitation, siRNA knockdown, apoptosis assay, pharmacological rescue","journal":"Molecular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction with mechanistic rescue experiment; single lab","pmids":["22301782"],"is_preprint":false},{"year":2019,"finding":"CtBP1 directly interacts with transcription factor FOXO3a and histone acetyltransferase p300 in vivo and in vitro; the CtBP1-p300-FOXO3a transcriptional complex specifically binds to the promoters of the pro-apoptotic genes Bax and Bim and represses their expression in osteosarcoma cells.","method":"Co-immunoprecipitation, GST pulldown, ChIP, promoter reporter assay, microarray","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro pulldown plus co-IP plus ChIP; single lab","pmids":["31074088"],"is_preprint":false},{"year":2019,"finding":"The CtBP1-HDAC1/2-IRF1 transcriptional complex binds to the GAS5 promoter and represses its expression in osteosarcoma cells; identified by co-IP/mass spectrometry and confirmed by co-IP assays.","method":"Co-immunoprecipitation, mass spectrometry, ChIP, siRNA knockdown","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — MS identification confirmed by co-IP and ChIP; single lab","pmids":["31337976"],"is_preprint":false},{"year":2023,"finding":"KAT2A promotes succinylation of CtBP1 at K46 and K280, which suppresses CtBP1's inhibitory activity on CDH1 transcription; CtBP1 directly binds SP1 to repress CDH1 transcription, and this repression is attenuated by KAT2A-mediated succinylation.","method":"Co-immunoprecipitation, ChIP, succinylation site mutagenesis, promoter reporter assay, siRNA knockdown, xenograft","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — succinylation site mutagenesis with co-IP and ChIP functional readout; single lab","pmids":["36764210"],"is_preprint":false},{"year":2018,"finding":"ATM-mediated phosphorylation of EVI1 at C-terminal S858/S860 increases EVI1's association with CtBP1 under genotoxic stress; EVI1-AQA (phosphorylation mutant) shows profoundly impaired interaction with CtBP1 and reduced clonogenic potential, linking ATM signaling to CtBP1-dependent EVI1 function.","method":"Mass spectrometry phosphoproteomics, phospho-site mutagenesis, co-immunoprecipitation, clonogenic assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — phosphosite identified by MS and confirmed by mutagenesis/co-IP with functional assay; single lab","pmids":["29939287"],"is_preprint":false},{"year":2002,"finding":"Genetic analysis in mice showed that Ctbp1 and Ctbp2 have overlapping roles in regulating gene expression during development; mice harboring various combinations of Ctbp1 and Ctbp2 mutant alleles exhibit dosage-sensitive defects across a wide range of developmental processes, and transcription assays in CtBP-deficient cells confirm overlapping transcriptional regulatory functions.","method":"Mouse knockout genetics (epistasis), transcription assays in CtBP-deficient cells","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout mouse genetics with epistasis analysis and cell-based transcription assays","pmids":["12101226"],"is_preprint":false},{"year":2014,"finding":"NSC95397 inhibits the CtBP1–E1A (PXDLS motif) protein-protein interaction (IC50 = 2.9 µM) and disrupts CtBP1-mediated transcriptional repression of a target gene; NSC95397 acts as a weak substrate of CtBP1 dehydrogenase activity, indicating it engages the active site.","method":"AlphaScreen HTS assay, secondary biochemical assays, transcriptional reporter assay","journal":"Journal of biomolecular screening","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical interaction assay with functional transcriptional readout; single lab","pmids":["25477201"],"is_preprint":false},{"year":2020,"finding":"CTBP1 activates RAD51 transcription in breast cancer cells; CtBP1 depletion increases cancer cell sensitivity to cisplatin, and re-expression of exogenous RAD51 in CtBP1-depleted cells restores cisplatin resistance, placing CtBP1 upstream of RAD51-mediated DNA repair in resistance.","method":"shRNA knockdown, chromatin immunoprecipitation, dual-luciferase reporter assay, cisplatin sensitivity assay","journal":"Molecular carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP and reporter confirm CtBP1 binding to RAD51 promoter; rescue experiment links mechanism to phenotype; single lab","pmids":["32124501"],"is_preprint":false},{"year":2020,"finding":"CTBP1 forms a repressor complex with ZEB1, EP300, and HDACs on the CLCA2 promoter to repress CLCA2 expression in prostate cancer cells; CLCA2 promotes cell adhesion and inhibits EMT; this repression is linked to metabolic syndrome/high-fat diet conditions.","method":"ChIP, co-immunoprecipitation, promoter reporter assay, siRNA knockdown, xenograft model","journal":"International journal of cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP complex characterization plus ChIP and reporter; single lab","pmids":["29536528"],"is_preprint":false},{"year":2005,"finding":"CtBP1 physically interacts with Glis2 transcription factor (confirmed by GST pulldown); co-expression of CtBP1 with Glis2 relocalizes CtBP1 from diffuse cytoplasmic/nuclear distribution to nuclear speckles co-localizing with Glis2; CtBP1 recruits HDAC3 to mediate Glis2-dependent transcriptional repression.","method":"Yeast two-hybrid, GST pulldown, mammalian two-hybrid, confocal microscopy, transcriptional reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pulldown and confocal with functional reporter; single lab","pmids":["16326862"],"is_preprint":false},{"year":2020,"finding":"The PRDM14-CtBP1/2-PRC2 complex mediates transcriptional repression during transition from primed to naïve pluripotency; CtBP1/2 bind PRDM14 through CBFA2T2; loss of Ctbp1/2 impairs PRDM14-mediated repression and reduces PRC2/H3K27me3 enrichment at target genes.","method":"Co-immunoprecipitation, ChIP-seq, knockout cells, transcriptional analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP interaction and ChIP-seq with functional knockout; single lab","pmids":["32661086"],"is_preprint":false},{"year":2023,"finding":"CTBP1 interacts with HDAC1 and HDAC2 to form a complex that suppresses MAT1A transcription in hepatocellular carcinoma cells; MAT1A suppression reduces S-adenosylmethionine levels, promoting ferroptosis resistance and immune escape.","method":"Co-immunoprecipitation, ChIP, siRNA knockdown, S-adenosylmethionine measurement, xenograft","journal":"Laboratory investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and ChIP establish complex on MAT1A promoter with functional metabolic and immune readouts; single lab","pmids":["37230466"],"is_preprint":false}],"current_model":"CTBP1 is a bifunctional protein that operates as a transcriptional corepressor in the nucleus—forming NAD(H)-dependent dimers/tetramers that scaffold a core complex of HDAC1/2, CoREST/LSD1, and Ubc9 recruited through a hydrophobic PLDLS-binding cleft, with activity modulated by cellular NADH/NAD+ ratio, phosphorylation by PAK1/PKA/Akt1, and post-translational modifications including ADP-ribosylation, succinylation, and ubiquitination—and as a membrane-fission inducer in the cytoplasm, where it is activated by PAK1-mediated phosphorylation at a specific serine to drive dynamin-independent fission of macropinosomes and Golgi-derived post-Golgi carriers through a multi-protein complex involving 14-3-3γ, PI4KIIIβ, and LPAATδ-mediated conversion of LPA to phosphatidic acid; at presynapses, CtBP1 is anchored by direct interaction with Bassoon and Piccolo and facilitates synaptic vesicle recycling through its membrane-fission/PLD1-activating activity, with presynaptic retention regulated by NAD/NADH levels to couple synaptic activity to nuclear gene expression."},"narrative":{"mechanistic_narrative":"CTBP1 is a bifunctional NAD(H)-sensing protein that operates as a nuclear transcriptional corepressor and as a cytoplasmic membrane-fission factor, coupling cellular metabolic state to gene expression and membrane trafficking [PMID:12805226, PMID:25652077]. In the nucleus it is recruited to DNA-binding repressors through a hydrophobic cleft that recognizes PXDLS-type motifs, engaging transcription factors such as deltaEF1, SATB1, and Glis2 [PMID:10567582, PMID:19103759, PMID:16326862], and it assembles a core repressive machinery of HDAC1/2, CoREST/LSD1, and the SUMO E2 Ubc9, with HDAC activity contributing the bulk of repression [PMID:17967884]. Repression depends on NAD(H)-dependent self-association: NAD(+) binding drives a dimer-to-tetramer transition through a Trp318 switch, and structural studies show the NAD(H)-free protein is conformationally destabilized at the dimer interface, whereas dehydrogenase catalysis itself is dispensable for repression [PMID:12805226, PMID:23940047, PMID:19351597]. CtBP1 and CtBP2 act redundantly and dosage-sensitively to control developmental gene expression [PMID:12101226]. In the cytoplasm CtBP1/BARS drives a dynamin-independent membrane-fission machinery for basolateral Golgi-to-plasma-membrane transport, post-Golgi carrier formation, and fluid-phase/macropinocytic endocytosis [PMID:15880102, PMID:18354494]; the previously ascribed intrinsic LPAAT activity was shown to be a co-purification artefact [PMID:16319893]. Fission is triggered by PAK1 phosphorylation at S147 upon EGF or viral stimulation [PMID:18354494, PMID:18323776], requires activation of phospholipase D1 [PMID:19322195], and proceeds via a trans-Golgi complex in which 14-3-3γ bridges CtBP1/BARS to PI(4)KIIIβ and CtBP1/BARS binds and activates LPAATδ to convert LPA to phosphatidic acid [PMID:22366688, PMID:27401954]. Its activity across both compartments is tuned by post-translational modification—PKA, PAK1, and Akt1 phosphorylation, ADP-ribosylation that locks the dimer and blocks fission interactors, succinylation, and ubiquitination controlling stability and nuclear retention [PMID:23716697, PMID:18184656, PMID:20361981, PMID:29142217, PMID:36764210]. At presynapses CtBP1 is anchored by Bassoon and Piccolo, and NAD/NADH-regulated shuttling between synaptic and nuclear pools, together with its PLD1-dependent fission activity, supports synaptic vesicle recycling [PMID:25652077, PMID:32075774]. A de novo R342W mutation in the PXDLS-binding cleft impairs chromatin-factor binding and underlies a neurodevelopmental disorder with altered apoptotic responses in patient cells [PMID:31041561].","teleology":[{"year":1999,"claim":"Established CtBP1 as a sequence-specific corepressor recruited to DNA-binding factors, defining the PLDLS-motif recognition principle that organizes its nuclear function.","evidence":"Yeast two-hybrid, co-IP, and Gal4 repression assays with deltaEF1 and PLDLSL mutagenesis","pmids":["10567582"],"confidence":"High","gaps":["Did not resolve the enzymatic core of the repressor complex","No structural basis for motif recognition yet"]},{"year":2002,"claim":"Demonstrated that Ctbp1 and Ctbp2 are functionally redundant, dosage-sensitive regulators of developmental gene expression in vivo.","evidence":"Mouse knockout epistasis and cell-based transcription assays","pmids":["12101226"],"confidence":"High","gaps":["Did not assign distinct molecular roles to CtBP1 vs CtBP2","Specific target genes per process not fully mapped"]},{"year":2003,"claim":"Provided the structural basis for CtBP1's bifunctionality by showing NAD(H)-dependent dimerization and a defined PXDLS peptide-binding interface.","evidence":"X-ray crystallography of NAD(H) and PXDLS-peptide complexes with mutagenesis","pmids":["12805226"],"confidence":"High","gaps":["Did not resolve the higher-order tetramer","Link between dimerization and membrane fission not yet mechanistic"]},{"year":2005,"claim":"Placed CtBP1/BARS as a dynamin-independent membrane-fission machine in selective trafficking routes and refuted its proposed intrinsic LPAAT activity.","evidence":"RNAi, dominant-negative, EM, transport assays; in vitro LPAAT reconstitution controls","pmids":["15880102","16319893"],"confidence":"High","gaps":["Mechanism of fission without intrinsic acyltransferase activity left open","Trigger and partners for fission not yet identified"]},{"year":2007,"claim":"Resolved the architecture of the repressor complex, showing the PLDLS cleft as the recruitment hub for HDAC1/2, CoREST/LSD1, and Ubc9, with dimerization rather than catalysis required for repression.","evidence":"Structure-guided mutagenesis, co-IP, and transcriptional repression assays","pmids":["17967884"],"confidence":"High","gaps":["In vivo stoichiometry of the assembled complex not defined","Context-specific subunit composition unresolved"]},{"year":2007,"claim":"Connected the nuclear repressor function to metabolic output by showing ADP-ribosylation inactivates repression and controls neutral lipid storage genes.","evidence":"siRNA, BFA treatment, ribosylation inhibitors, lipid droplet imaging, knockout MEFs","pmids":["17538025"],"confidence":"Medium","gaps":["Direct target genes driving lipid storage not fully enumerated","Single-lab phenocopy of BFA effect"]},{"year":2008,"claim":"Identified PAK1 phosphorylation at S147 as the switch that activates CtBP1/BARS for macropinocytic-cup fission downstream of receptor and viral signaling.","evidence":"Phospho-site mutagenesis, live imaging, RNAi, and viral entry assays (two independent studies)","pmids":["18354494","18323776"],"confidence":"High","gaps":["Upstream kinase activation kinetics in physiological contexts incomplete","How phosphorylation alters CtBP1 conformation/partner binding not structurally resolved"]},{"year":2009,"claim":"Defined the biochemical fission mechanism by establishing CtBP1/BARS as a physiological activator of PLD1 upstream of macropinosome formation.","evidence":"Co-IP, in vitro and intact-cell PLD assays, and 1-butanol inhibition","pmids":["19322195"],"confidence":"High","gaps":["Spatial coordination of PLD1 product with fission site not fully resolved","Synergy with ARF GTPases mechanistically incomplete"]},{"year":2009,"claim":"Clarified the NAD(H)-coupled conformational logic, showing the apo mutant is destabilized at the dimer interface.","evidence":"Crystallography of NAD(H)-free G172E mutant with size-exclusion chromatography","pmids":["19351597"],"confidence":"High","gaps":["Dynamics of NAD(H) sensing in cells not measured","Coupling to tetramerization not addressed structurally"]},{"year":2012,"claim":"Built the trans-Golgi fission complex by showing 14-3-3γ dimers bridge CtBP1/BARS to PI(4)KIIIβ under kinase control.","evidence":"Reciprocal co-IP, dominant-negative/RNAi disruption, live imaging, and EM","pmids":["22366688"],"confidence":"High","gaps":["Lipid-modifying step downstream of complex assembly not yet defined","Quantitative phosphorylation dependence incomplete"]},{"year":2013,"claim":"Showed multimerization proceeds via a dimer intermediate to a tetramer governed by a Trp318 switch, decoupling repression from NAD catalysis.","evidence":"In vitro assembly, co-IP, mammalian two-hybrid, and reporter assays with mutagenesis","pmids":["23940047"],"confidence":"High","gaps":["Functional role of the tetramer vs dimer in vivo not separated","Whether tetramerization gates 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molecular basis for the two co-existing activities (transcriptional co-repression and acyl-CoA-dependent membrane fission).\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis, binding experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis and binding experiments in one rigorous study\",\n      \"pmids\": [\"12805226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Structure-based functional dissection of CtBP1 showed that the PLDLS-binding hydrophobic cleft is the primary recruitment center for DNA-binding repressors and for the core enzymatic components HDAC1/2, CoREST/LSD1, and Ubc9 (E2 SUMO ligase), which interact via non-PLDLS contacts. HDACs contribute predominantly to CtBP1 repression activity. NAD(H)-dependent dimerization (not dehydrogenase activity) is required for transcriptional repression. CtBP1 also serves as a platform for sumoylation of cofactors. Auxiliary components (G9a/Wiz/CDYL HMTase complex, PIAS1, HPC2) interact with the PLDLS cleft and are displaced by E1A-PLDLS.\",\n      \"method\": \"Structure-based mutagenesis, co-immunoprecipitation, transcriptional repression assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — structure-guided mutagenesis combined with multiple co-IP and functional assays in one study\",\n      \"pmids\": [\"17967884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NAD(H)-dependent multimerization of CtBP1 proceeds through a dimeric intermediate to a tetramer; Trp318 acts as a switch for dimerization upon NAD(+) binding; the C-terminus is required for dimer-of-dimers formation. NAD(H)-binding mutants do not self-associate in vitro or in vivo but retain PXDLS-motif binding. Transcriptional repression depends on the N-terminal domain recruiting PXDLS-containing targets, not on NAD binding or dehydrogenase activity per se.\",\n      \"method\": \"In vitro biochemical oligomerization assays, co-immunoprecipitation, mammalian two-hybrid, mutagenesis, transcriptional reporter assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal biochemical methods (in vitro assembly, co-IP, two-hybrid, reporters) with systematic mutagenesis\",\n      \"pmids\": [\"23940047\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CtBP3/BARS (the short isoform of CtBP1) controls membrane fission in basolateral transport from the Golgi to the plasma membrane and in fluid-phase endocytosis, but is inactive in apical transport and receptor-mediated endocytosis (both controlled by dynamin), establishing that CtBP1/BARS and dynamin define distinct, non-overlapping fission machineries.\",\n      \"method\": \"Dominant-negative protein expression, RNAi, live-cell and electron microscopy, transport assays in intact cells\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple experimental approaches (RNAi, dominant-negative, EM, transport assays) with clear mechanistic pathway placement\",\n      \"pmids\": [\"15880102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The proposed lysophosphatidic acid acyltransferase (LPAAT) activity of CtBP/BARS, previously suggested to drive membrane fission by changing bilayer curvature, was shown to be a co-purification artefact; purified CtBP/BARS has no intrinsic LPAAT activity.\",\n      \"method\": \"In vitro LPAAT enzymatic assay with purified proteins and appropriate controls\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous in vitro enzymatic reconstitution demonstrating the activity is an artefact; published in Nature\",\n      \"pmids\": [\"16319893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Upon EGF receptor activation, CtBP1/BARS translocates to macropinocytic cups, is phosphorylated by PAK1 at a specific serine residue (identified as the PAK substrate site), and this phosphorylation is essential for fission of the macropinocytic cup; CtBP1/BARS is also required for echovirus 1 macropinocytic internalization.\",\n      \"method\": \"Live-cell fluorescence microscopy, pharmacological inhibition, phosphorylation site mutagenesis, RNAi, viral infection assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — mutagenesis of phosphorylation site combined with live imaging and functional fission assay in one study; independently corroborated by PMID 18323776\",\n      \"pmids\": [\"18354494\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ad3 infectious macropinocytosis requires viral activation of PAK1, which phosphorylates CtBP1 at S147; a phosphorylation-defective S147A-CtBP1 mutant blocks Ad3 but not Ad5 infection, directly linking PAK1 phosphorylation of CtBP1 to Ad3 macropinocytic entry.\",\n      \"method\": \"Dominant-negative mutant overexpression, pharmacological inhibition, viral infection assays, co-localization microscopy\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — phosphorylation-defective mutant provides direct mechanistic link; replicated PAK1–CtBP1 phosphorylation finding from PMID 18354494\",\n      \"pmids\": [\"18323776\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CtBP1/BARS is a physiological activator of phospholipase D1 (PLD1); EGF or serum stimulation induces association of CtBP1/BARS with PLD1, and CtBP1/BARS activates PLD1 synergistically with ARF GTPases in vitro and in cells. 1-Butanol (PLD product inhibitor) blocks EGF-induced macropinocytosis, placing CtBP1/BARS–PLD1 activation upstream of macropinosome formation.\",\n      \"method\": \"Co-immunoprecipitation, in vitro PLD activity assay, intact-cell PLD assay, pharmacological inhibition\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro enzymatic assay plus co-IP plus intact-cell assay, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19322195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"14-3-3γ dimers bridge CtBP1-S/BARS with PI(4)KIIIβ to form a complex that couples Golgi carrier budding and fission; the complex is stabilized by PKD and PAK phosphorylation, and disrupting CtBP1-S/BARS association with 14-3-3γ or PI(4)KIIIβ inhibits fission of elongating post-Golgi carrier precursors.\",\n      \"method\": \"Co-immunoprecipitation, dominant-negative constructs, RNAi, live-cell imaging, electron microscopy\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, functional disruption, and imaging in one study published in Nature Cell Biology\",\n      \"pmids\": [\"22366688\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"BFA induces ADP-ribosylation of CtBP1-S/BARS via a two-step mechanism: CD38 (ADP-ribosyl cyclase) synthesizes a BFA-ADP-ribose conjugate, which then covalently inserts into the CtBP1-S/BARS NAD(+)-binding pocket. This locks CtBP1-S/BARS in a dimer conformation, prevents binding to membrane fission interactors, and inhibits mitotic Golgi partitioning, arresting cells in G2.\",\n      \"method\": \"Mass spectrometry, biochemical ADP-ribosylation assays, mutagenesis, cell-cycle analysis, co-immunoprecipitation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical mechanism resolved by MS and mutagenesis with functional cell-cycle readout\",\n      \"pmids\": [\"23716697\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"When incorporated into the 14-3-3γ/PI4KIIIβ/ARF/PKD/PAK complex at the trans-Golgi, CtBP1-S/BARS binds to and activates LPA acyltransferase δ (LPAATδ), converting LPA to phosphatidic acid (PA); this LPA-to-PA conversion is essential for fission of post-Golgi carriers.\",\n      \"method\": \"Co-immunoprecipitation, in vitro acyltransferase activity assay, RNAi, transport assays, lipidomics\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro enzymatic assay combined with co-IP, RNAi rescue, and functional transport assays\",\n      \"pmids\": [\"27401954\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Crystal structure of the NAD(H)-free G172E CtBP1/BARS mutant reveals that absence of NAD(H) causes flexibility and backbone conformational changes at the dimerization interface and interdomain region, explaining how NAD(H) binding promotes functional dimerization.\",\n      \"method\": \"X-ray crystallography, size-exclusion chromatography\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with biochemical validation, single lab but rigorous structural method\",\n      \"pmids\": [\"19351597\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mono-ADP-ribosylation of CtBP1/BARS (induced by BFA) inactivates its transcriptional repressor function, leading to activation of genes that regulate neutral lipid storage; siRNA knockdown of CtBP1/BARS mimics BFA-induced lipid droplet loss, and CtBP1/BARS-deficient MEFs are defective in lipid accumulation.\",\n      \"method\": \"siRNA knockdown, BFA treatment, ribosylation inhibitors, lipid droplet microscopy, MEF knockout cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA phenocopy of BFA effect with multiple inhibitors, single lab\",\n      \"pmids\": [\"17538025\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"CtBP1 (and CtBP2) acts as a corepressor of the zinc finger-homeodomain transcription factor deltaEF1; interaction is mediated by the PLDLSL sequence in deltaEF1; exogenous CtBP1/2 enhances deltaEF1-mediated transcriptional repression and this enhancement is abolished when the PLDLSL motif is mutated.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, Gal4-fusion transcriptional repression assays, mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — yeast two-hybrid confirmed by co-IP and functional transcriptional assays with mutagenesis in one study\",\n      \"pmids\": [\"10567582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"SATB1 interacts with CtBP1 via the PVPLS motif within SATB1's PDZ-like domain to form a repressor complex in vivo; acetylation of SATB1 (induced by LiCl/ionomycin) disrupts its association with CtBP1, leading to derepression of target genes (IL-2, c-Myc promoters) and reduced CtBP1 and HDAC1 chromatin occupancy.\",\n      \"method\": \"Co-immunoprecipitation, chromatin immunoprecipitation, gene expression profiling, mutagenesis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, ChIP, and functional readout with acetylation-dependent mechanism; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19103759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PKA (activated by ACTH/cAMP signaling) phosphorylates CtBP1 at T144, stimulating partnering of CtBP1 with CtBP2 and modulating ACTH-dependent CYP17 transcription; both ACTH/cAMP signaling and NADH/NAD+ ratio changes drive nuclear-cytoplasmic oscillation of CtBP proteins.\",\n      \"method\": \"Phosphorylation site mutagenesis, co-immunoprecipitation, transcriptional reporter assays, pharmacological manipulation of cAMP\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphorylation site identified and mutated with functional transcriptional readout; single lab\",\n      \"pmids\": [\"18184656\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Akt1 phosphorylates CtBP1 (promoted by the SUMO E3 ligase Pc2/Cbx4 which recruits Akt1 and prevents its dephosphorylation); Akt1-mediated phosphorylation of CtBP1 decreases its dimerization, targets it for poly-ubiquitylation and proteasomal degradation, and reduces transcriptional repression.\",\n      \"method\": \"Co-immunoprecipitation, phospho-specific analysis, mutagenesis (phosphomimetic), ubiquitylation assay, stability assays, transcriptional reporter\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP with multiple functional assays (dimerization, ubiquitylation, stability, transcription), single lab\",\n      \"pmids\": [\"20361981\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FBXO32 (an E3 ubiquitin ligase) directly ubiquitinates CtBP1, which is required for CtBP1 stability and nuclear retention; this ubiquitination is essential for epigenetic remodeling and transcriptional induction of CtBP1 target genes that create a microenvironment permissive for EMT.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, nuclear fractionation, ChIP, siRNA knockdown, xenograft model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ubiquitination demonstrated biochemically with nuclear localization and functional transcriptional readout; single lab\",\n      \"pmids\": [\"29142217\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CtBP1 is present in both presynaptic and nuclear pools of neurons; it is anchored to presynapses by direct interaction with active zone scaffolding proteins Bassoon and Piccolo; synaptic retention and nuclear shuttling of CtBP1 are co-regulated by neuronal activity via modulation of cellular NAD/NADH levels, thereby coupling presynaptic activity to nuclear gene expression.\",\n      \"method\": \"Co-immunoprecipitation, live-cell imaging, subcellular fractionation, NAD/NADH manipulation, knockdown experiments\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct interaction demonstrated by co-IP with functional link between localization and gene expression via NAD/NADH; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"25652077\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Presynaptic CtBP1 facilitates compensatory endocytosis of synaptic vesicles via its membrane-fission activity; in CtBP1-null hippocampal neurons, recycling of synaptic vesicles is impaired. Rescue experiments with targeted constructs showed that while synaptogenesis and release probability are controlled by nuclear CtBP1, efficient SV recycling depends on synaptic CtBP1 and requires activation of PLD1.\",\n      \"method\": \"Knockout neurons, targeted rescue constructs, electrophysiology, live-cell fluorescence imaging\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with targeted rescue dissecting nuclear vs. synaptic function, multiple readouts\",\n      \"pmids\": [\"32075774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"CtBP1 represses Brca1 transcription by binding to the E2F4 site of the Brca1 promoter in a redox-dependent manner: CtBP1 recruitment is increased at high NADH levels (hypoxic conditions), and pharmacological reduction of NADH with Tempol relieves CtBP1-mediated Brca1 repression and increases DNA repair.\",\n      \"method\": \"Chromatin immunoprecipitation, reporter assay, NADH manipulation, siRNA knockdown, tissue array immunostaining\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter with NADH-dependent functional rescue; single lab\",\n      \"pmids\": [\"20818429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Agonist-bound ERalpha recruits the corepressor CtBP1 (via p300, a p300-interacting partner) to early estrogen-repressed genes, driving chromatin modifications leading to transcriptional repression; p300 knockdown prevents estrogen-mediated gene repression.\",\n      \"method\": \"Chromatin immunoprecipitation, siRNA knockdown, gene expression analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and knockdown with functional readout; single lab\",\n      \"pmids\": [\"19188451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ZNF750 interacts with chromatin regulators RCOR1, KDM1A, and CTBP1/2 through conserved PLNLS sequences; KDM1A colocalizes with ZNF750 at progenitor genes to facilitate their repression, while KLF4 colocalizes at differentiation genes for activation; CTBP1/2 and RCOR1 participate in both regulatory modes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, gene depletion (RNAi)\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus ChIP-seq with gene depletion; single lab\",\n      \"pmids\": [\"25228645\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Bcl3 interacts with CtBP1 via a PXDLS/R motif embedded in Bcl3, stabilizing CtBP1 by blocking proteasome-dependent degradation; this stabilization sustains CtBP1-mediated repression of pro-apoptotic genes and inhibits apoptosis.\",\n      \"method\": \"Proteomic (co-IP/MS), co-immunoprecipitation, proteasome inhibitor assay, apoptosis assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification confirmed by co-IP with PXDLS motif mapping and stability assay; single lab\",\n      \"pmids\": [\"20800578\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The pathogenic de novo R342W CtBP1 mutation (located in the PLDLS-binding cleft) reduces interaction with several chromatin-modifying factors as shown by unbiased proteomics; genome-wide transcriptome changes occur in cells expressing the mutant; patient-derived fibroblasts show enhanced apoptosis during glucose deprivation linked to upregulation of NOXA.\",\n      \"method\": \"Unbiased proteomic (co-IP/MS), RNA-seq, patient-derived fibroblast functional assays\",\n      \"journal\": \"Neurogenetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic interaction profiling plus transcriptome analysis and patient cell functional assay; single study\",\n      \"pmids\": [\"31041561\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"FANCC (Fanconi anemia group C protein) and other FA core complex proteins interact directly with CtBP1; CtBP1 is essential for proliferation, cell survival, and chromosomal integrity in FA cells; expression profiling of CtBP1-depleted and FA-depleted cells identified commonly regulated genes including the Wnt antagonist DKK1.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, expression profiling\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-IP interaction with functional knockdown readout; single lab\",\n      \"pmids\": [\"23303816\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CtBP1 interacts with Ikaros isoforms in pituitary tumor cells; CtBP1 deficiency up-regulates Sprouty2 and down-regulates Enpp2; CtBP1-deficient pituitary cells are more susceptible to hypoxia-induced apoptosis, rescued by Enpp2-derived lysophosphatidic acid treatment.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, apoptosis assay, pharmacological rescue\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction with mechanistic rescue experiment; single lab\",\n      \"pmids\": [\"22301782\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CtBP1 directly interacts with transcription factor FOXO3a and histone acetyltransferase p300 in vivo and in vitro; the CtBP1-p300-FOXO3a transcriptional complex specifically binds to the promoters of the pro-apoptotic genes Bax and Bim and represses their expression in osteosarcoma cells.\",\n      \"method\": \"Co-immunoprecipitation, GST pulldown, ChIP, promoter reporter assay, microarray\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro pulldown plus co-IP plus ChIP; single lab\",\n      \"pmids\": [\"31074088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The CtBP1-HDAC1/2-IRF1 transcriptional complex binds to the GAS5 promoter and represses its expression in osteosarcoma cells; identified by co-IP/mass spectrometry and confirmed by co-IP assays.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry, ChIP, siRNA knockdown\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — MS identification confirmed by co-IP and ChIP; single lab\",\n      \"pmids\": [\"31337976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KAT2A promotes succinylation of CtBP1 at K46 and K280, which suppresses CtBP1's inhibitory activity on CDH1 transcription; CtBP1 directly binds SP1 to repress CDH1 transcription, and this repression is attenuated by KAT2A-mediated succinylation.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, succinylation site mutagenesis, promoter reporter assay, siRNA knockdown, xenograft\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — succinylation site mutagenesis with co-IP and ChIP functional readout; single lab\",\n      \"pmids\": [\"36764210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATM-mediated phosphorylation of EVI1 at C-terminal S858/S860 increases EVI1's association with CtBP1 under genotoxic stress; EVI1-AQA (phosphorylation mutant) shows profoundly impaired interaction with CtBP1 and reduced clonogenic potential, linking ATM signaling to CtBP1-dependent EVI1 function.\",\n      \"method\": \"Mass spectrometry phosphoproteomics, phospho-site mutagenesis, co-immunoprecipitation, clonogenic assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — phosphosite identified by MS and confirmed by mutagenesis/co-IP with functional assay; single lab\",\n      \"pmids\": [\"29939287\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Genetic analysis in mice showed that Ctbp1 and Ctbp2 have overlapping roles in regulating gene expression during development; mice harboring various combinations of Ctbp1 and Ctbp2 mutant alleles exhibit dosage-sensitive defects across a wide range of developmental processes, and transcription assays in CtBP-deficient cells confirm overlapping transcriptional regulatory functions.\",\n      \"method\": \"Mouse knockout genetics (epistasis), transcription assays in CtBP-deficient cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout mouse genetics with epistasis analysis and cell-based transcription assays\",\n      \"pmids\": [\"12101226\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NSC95397 inhibits the CtBP1–E1A (PXDLS motif) protein-protein interaction (IC50 = 2.9 µM) and disrupts CtBP1-mediated transcriptional repression of a target gene; NSC95397 acts as a weak substrate of CtBP1 dehydrogenase activity, indicating it engages the active site.\",\n      \"method\": \"AlphaScreen HTS assay, secondary biochemical assays, transcriptional reporter assay\",\n      \"journal\": \"Journal of biomolecular screening\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical interaction assay with functional transcriptional readout; single lab\",\n      \"pmids\": [\"25477201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CTBP1 activates RAD51 transcription in breast cancer cells; CtBP1 depletion increases cancer cell sensitivity to cisplatin, and re-expression of exogenous RAD51 in CtBP1-depleted cells restores cisplatin resistance, placing CtBP1 upstream of RAD51-mediated DNA repair in resistance.\",\n      \"method\": \"shRNA knockdown, chromatin immunoprecipitation, dual-luciferase reporter assay, cisplatin sensitivity assay\",\n      \"journal\": \"Molecular carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP and reporter confirm CtBP1 binding to RAD51 promoter; rescue experiment links mechanism to phenotype; single lab\",\n      \"pmids\": [\"32124501\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CTBP1 forms a repressor complex with ZEB1, EP300, and HDACs on the CLCA2 promoter to repress CLCA2 expression in prostate cancer cells; CLCA2 promotes cell adhesion and inhibits EMT; this repression is linked to metabolic syndrome/high-fat diet conditions.\",\n      \"method\": \"ChIP, co-immunoprecipitation, promoter reporter assay, siRNA knockdown, xenograft model\",\n      \"journal\": \"International journal of cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP complex characterization plus ChIP and reporter; single lab\",\n      \"pmids\": [\"29536528\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"CtBP1 physically interacts with Glis2 transcription factor (confirmed by GST pulldown); co-expression of CtBP1 with Glis2 relocalizes CtBP1 from diffuse cytoplasmic/nuclear distribution to nuclear speckles co-localizing with Glis2; CtBP1 recruits HDAC3 to mediate Glis2-dependent transcriptional repression.\",\n      \"method\": \"Yeast two-hybrid, GST pulldown, mammalian two-hybrid, confocal microscopy, transcriptional reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by GST pulldown and confocal with functional reporter; single lab\",\n      \"pmids\": [\"16326862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The PRDM14-CtBP1/2-PRC2 complex mediates transcriptional repression during transition from primed to naïve pluripotency; CtBP1/2 bind PRDM14 through CBFA2T2; loss of Ctbp1/2 impairs PRDM14-mediated repression and reduces PRC2/H3K27me3 enrichment at target genes.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, knockout cells, transcriptional analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP interaction and ChIP-seq with functional knockout; single lab\",\n      \"pmids\": [\"32661086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CTBP1 interacts with HDAC1 and HDAC2 to form a complex that suppresses MAT1A transcription in hepatocellular carcinoma cells; MAT1A suppression reduces S-adenosylmethionine levels, promoting ferroptosis resistance and immune escape.\",\n      \"method\": \"Co-immunoprecipitation, ChIP, siRNA knockdown, S-adenosylmethionine measurement, xenograft\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and ChIP establish complex on MAT1A promoter with functional metabolic and immune readouts; single lab\",\n      \"pmids\": [\"37230466\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CTBP1 is a bifunctional protein that operates as a transcriptional corepressor in the nucleus—forming NAD(H)-dependent dimers/tetramers that scaffold a core complex of HDAC1/2, CoREST/LSD1, and Ubc9 recruited through a hydrophobic PLDLS-binding cleft, with activity modulated by cellular NADH/NAD+ ratio, phosphorylation by PAK1/PKA/Akt1, and post-translational modifications including ADP-ribosylation, succinylation, and ubiquitination—and as a membrane-fission inducer in the cytoplasm, where it is activated by PAK1-mediated phosphorylation at a specific serine to drive dynamin-independent fission of macropinosomes and Golgi-derived post-Golgi carriers through a multi-protein complex involving 14-3-3γ, PI4KIIIβ, and LPAATδ-mediated conversion of LPA to phosphatidic acid; at presynapses, CtBP1 is anchored by direct interaction with Bassoon and Piccolo and facilitates synaptic vesicle recycling through its membrane-fission/PLD1-activating activity, with presynaptic retention regulated by NAD/NADH levels to couple synaptic activity to nuclear gene expression.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CTBP1 is a bifunctional NAD(H)-sensing protein that operates as a nuclear transcriptional corepressor and as a cytoplasmic membrane-fission factor, coupling cellular metabolic state to gene expression and membrane trafficking [#0, #18]. In the nucleus it is recruited to DNA-binding repressors through a hydrophobic cleft that recognizes PXDLS-type motifs, engaging transcription factors such as deltaEF1, SATB1, and Glis2 [#13, #14, #35], and it assembles a core repressive machinery of HDAC1/2, CoREST/LSD1, and the SUMO E2 Ubc9, with HDAC activity contributing the bulk of repression [#1]. Repression depends on NAD(H)-dependent self-association: NAD(+) binding drives a dimer-to-tetramer transition through a Trp318 switch, and structural studies show the NAD(H)-free protein is conformationally destabilized at the dimer interface, whereas dehydrogenase catalysis itself is dispensable for repression [#0, #2, #11]. CtBP1 and CtBP2 act redundantly and dosage-sensitively to control developmental gene expression [#31]. In the cytoplasm CtBP1/BARS drives a dynamin-independent membrane-fission machinery for basolateral Golgi-to-plasma-membrane transport, post-Golgi carrier formation, and fluid-phase/macropinocytic endocytosis [#3, #5]; the previously ascribed intrinsic LPAAT activity was shown to be a co-purification artefact [#4]. Fission is triggered by PAK1 phosphorylation at S147 upon EGF or viral stimulation [#5, #6], requires activation of phospholipase D1 [#7], and proceeds via a trans-Golgi complex in which 14-3-3γ bridges CtBP1/BARS to PI(4)KIII\\u03b2 and CtBP1/BARS binds and activates LPAAT\\u03b4 to convert LPA to phosphatidic acid [#8, #10]. Its activity across both compartments is tuned by post-translational modification\\u2014PKA, PAK1, and Akt1 phosphorylation, ADP-ribosylation that locks the dimer and blocks fission interactors, succinylation, and ubiquitination controlling stability and nuclear retention [#9, #15, #16, #17, #29]. At presynapses CtBP1 is anchored by Bassoon and Piccolo, and NAD/NADH-regulated shuttling between synaptic and nuclear pools, together with its PLD1-dependent fission activity, supports synaptic vesicle recycling [#18, #19]. A de novo R342W mutation in the PXDLS-binding cleft impairs chromatin-factor binding and underlies a neurodevelopmental disorder with altered apoptotic responses in patient cells [#24].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established CtBP1 as a sequence-specific corepressor recruited to DNA-binding factors, defining the PLDLS-motif recognition principle that organizes its nuclear function.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, and Gal4 repression assays with deltaEF1 and PLDLSL mutagenesis\",\n      \"pmids\": [\"10567582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the enzymatic core of the repressor complex\", \"No structural basis for motif recognition yet\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstrated that Ctbp1 and Ctbp2 are functionally redundant, dosage-sensitive regulators of developmental gene expression in vivo.\",\n      \"evidence\": \"Mouse knockout epistasis and cell-based transcription assays\",\n      \"pmids\": [\"12101226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not assign distinct molecular roles to CtBP1 vs CtBP2\", \"Specific target genes per process not fully mapped\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Provided the structural basis for CtBP1's bifunctionality by showing NAD(H)-dependent dimerization and a defined PXDLS peptide-binding interface.\",\n      \"evidence\": \"X-ray crystallography of NAD(H) and PXDLS-peptide complexes with mutagenesis\",\n      \"pmids\": [\"12805226\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the higher-order tetramer\", \"Link between dimerization and membrane fission not yet mechanistic\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Placed CtBP1/BARS as a dynamin-independent membrane-fission machine in selective trafficking routes and refuted its proposed intrinsic LPAAT activity.\",\n      \"evidence\": \"RNAi, dominant-negative, EM, transport assays; in vitro LPAAT reconstitution controls\",\n      \"pmids\": [\"15880102\", \"16319893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of fission without intrinsic acyltransferase activity left open\", \"Trigger and partners for fission not yet identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the architecture of the repressor complex, showing the PLDLS cleft as the recruitment hub for HDAC1/2, CoREST/LSD1, and Ubc9, with dimerization rather than catalysis required for repression.\",\n      \"evidence\": \"Structure-guided mutagenesis, co-IP, and transcriptional repression assays\",\n      \"pmids\": [\"17967884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo stoichiometry of the assembled complex not defined\", \"Context-specific subunit composition unresolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Connected the nuclear repressor function to metabolic output by showing ADP-ribosylation inactivates repression and controls neutral lipid storage genes.\",\n      \"evidence\": \"siRNA, BFA treatment, ribosylation inhibitors, lipid droplet imaging, knockout MEFs\",\n      \"pmids\": [\"17538025\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct target genes driving lipid storage not fully enumerated\", \"Single-lab phenocopy of BFA effect\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified PAK1 phosphorylation at S147 as the switch that activates CtBP1/BARS for macropinocytic-cup fission downstream of receptor and viral signaling.\",\n      \"evidence\": \"Phospho-site mutagenesis, live imaging, RNAi, and viral entry assays (two independent studies)\",\n      \"pmids\": [\"18354494\", \"18323776\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream kinase activation kinetics in physiological contexts incomplete\", \"How phosphorylation alters CtBP1 conformation/partner binding not structurally resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined the biochemical fission mechanism by establishing CtBP1/BARS as a physiological activator of PLD1 upstream of macropinosome formation.\",\n      \"evidence\": \"Co-IP, in vitro and intact-cell PLD assays, and 1-butanol inhibition\",\n      \"pmids\": [\"19322195\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Spatial coordination of PLD1 product with fission site not fully resolved\", \"Synergy with ARF GTPases mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Clarified the NAD(H)-coupled conformational logic, showing the apo mutant is destabilized at the dimer interface.\",\n      \"evidence\": \"Crystallography of NAD(H)-free G172E mutant with size-exclusion chromatography\",\n      \"pmids\": [\"19351597\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of NAD(H) sensing in cells not measured\", \"Coupling to tetramerization not addressed structurally\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Built the trans-Golgi fission complex by showing 14-3-3γ dimers bridge CtBP1/BARS to PI(4)KIII\\u03b2 under kinase control.\",\n      \"evidence\": \"Reciprocal co-IP, dominant-negative/RNAi disruption, live imaging, and EM\",\n      \"pmids\": [\"22366688\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Lipid-modifying step downstream of complex assembly not yet defined\", \"Quantitative phosphorylation dependence incomplete\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed multimerization proceeds via a dimer intermediate to a tetramer governed by a Trp318 switch, decoupling repression from NAD catalysis.\",\n      \"evidence\": \"In vitro assembly, co-IP, mammalian two-hybrid, and reporter assays with mutagenesis\",\n      \"pmids\": [\"23940047\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of the tetramer vs dimer in vivo not separated\", \"Whether tetramerization gates specific target genes unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a two-step CD38/BFA ADP-ribosylation mechanism that locks CtBP1/BARS as a dimer, blocking fission interactors and arresting mitotic Golgi partitioning.\",\n      \"evidence\": \"Mass spectrometry, ADP-ribosylation assays, mutagenesis, and cell-cycle analysis\",\n      \"pmids\": [\"23716697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological inducers of this modification beyond BFA unclear\", \"Reversal/turnover of the modification not characterized\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Completed the lipid-conversion arm of fission by identifying LPAAT\\u03b4 activation by CtBP1/BARS to convert LPA to phosphatidic acid at post-Golgi carriers.\",\n      \"evidence\": \"Co-IP, in vitro acyltransferase assay, RNAi rescue, transport assays, and lipidomics\",\n      \"pmids\": [\"27401954\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How PA generation mechanically drives scission not fully resolved\", \"Selectivity for post-Golgi vs other membranes incomplete\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Extended CtBP1 to neurons, showing active-zone anchoring by Bassoon/Piccolo and NAD/NADH-regulated synaptic-nuclear shuttling that couples activity to gene expression.\",\n      \"evidence\": \"Co-IP, live imaging, fractionation, NAD/NADH manipulation, and knockdown\",\n      \"pmids\": [\"25652077\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative coupling of activity to nuclear target genes not mapped\", \"Single-lab interaction data\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Dissected neuronal CtBP1 into separable pools, assigning synaptic vesicle recycling to synaptic CtBP1 via PLD1 and synaptogenesis/release to nuclear CtBP1.\",\n      \"evidence\": \"Knockout neurons with targeted rescue constructs, electrophysiology, and live imaging\",\n      \"pmids\": [\"32075774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular details of fission at the synaptic vesicle membrane incomplete\", \"Coordination between the two pools during sustained activity unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked CTBP1 to human disease by showing the de novo R342W cleft mutation impairs chromatin-factor binding and alters apoptotic gene programs.\",\n      \"evidence\": \"Unbiased co-IP/MS, RNA-seq, and patient fibroblast glucose-deprivation assays\",\n      \"pmids\": [\"31041561\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from mutation to neurodevelopmental phenotype incomplete\", \"Single study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the metabolic NAD(H) sensor, the post-translational modification code, and partner-specific recruitment are integrated to switch CtBP1 between nuclear repression and cytoplasmic/synaptic fission in a given cellular context remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model coupling oligomeric state to compartmental function in vivo\", \"Context-specific determinants of partner choice unknown\", \"Quantitative thresholds of NADH/NAD+ governing the switch undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [1, 2, 13, 31]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [7, 10]},\n      {\"term_id\": \"GO:0003677\", \"supporting_discovery_ids\": [20, 27]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 13, 18]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 8, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [5, 18]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 13, 31]},\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [1, 14, 22]},\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [3, 8, 10]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [18, 19]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [23, 27]}\n    ],\n    \"complexes\": [\n      \"CtBP1 corepressor complex (HDAC1/2, CoREST/LSD1, Ubc9)\",\n      \"trans-Golgi fission complex (14-3-3γ/PI4KIIIβ/LPAATδ)\",\n      \"PRDM14-CtBP1/2-PRC2 complex\"\n    ],\n    \"partners\": [\n      \"HDAC1\",\n      \"HDAC2\",\n      \"PAK1\",\n      \"PLD1\",\n      \"YWHAG\",\n      \"Bassoon\",\n      \"Piccolo\",\n      \"EP300\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":9,"faith_pct":88.88888888888889}}