{"gene":"GIPC1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":1998,"finding":"GIPC1 (GIPC) was identified as a protein with a central PDZ domain that specifically interacts with the C terminus of RGS-GAIP (a GTPase-activating protein for Galphai subunits). The PDZ domain of GIPC binds the unique 11 amino acid C-terminus of GAIP (SEA motif) but does not interact with other RGS family members tested. GIPC exists in two pools: ~70% cytosolic and ~30% membrane-associated, with the membrane pool associating with clusters of vesicles near the plasma membrane.","method":"Yeast two-hybrid, GST pull-down assays, deletion mutant analysis, immunofluorescence, immunoelectron microscopy, immunoblotting of membrane fractions","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (yeast two-hybrid, GST pull-down, deletion analysis, IEM) in a single rigorous study establishing a direct interaction","pmids":["9770488"],"is_preprint":false},{"year":1999,"finding":"GIPC1 (GLUT1CBP) binds via its PDZ domain to the C terminus of GLUT1 glucose transporter in an isoform-specific manner (not GLUT3 or GLUT4), and also interacts with cytoskeletal proteins myosin VI, alpha-actinin-1, and KIF-1B, implicating GIPC1 as an adapter linking GLUT1 to the cytoskeleton.","method":"Yeast two-hybrid, GST pull-down, co-immunoprecipitation with native GLUT1 from cell membranes","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal binding assays (yeast two-hybrid, pulldown, co-IP with native protein), replicated across multiple interactions","pmids":["10198040"],"is_preprint":false},{"year":2001,"finding":"GIPC1 binds via its PDZ domain to the juxtamembrane region of TrkA NGF receptor, and together with GAIP forms a coprecipitable complex. GIPC1 colocalizes with phosphorylated TrkA in retrograde transport vesicles in neurites and cell bodies. Overexpression of GIPC1 in PC12 cells decreases NGF-induced ERK1/2 phosphorylation without affecting Akt, PLC-gamma1, or Shc phosphorylation.","method":"Co-immunoprecipitation in HEK293T and PC12 cells, immunofluorescence colocalization, overexpression with ERK phosphorylation readout","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP in multiple cell types, colocalization, functional overexpression with specific signaling readout","pmids":["11251075"],"is_preprint":false},{"year":2001,"finding":"GIPC1 PDZ domain interacts with a Class I PDZ binding motif in the cytoplasmic domain of TGF-beta type III receptor (TbetaRIII), stabilizing cell surface expression of TbetaRIII and enhancing TGF-beta signaling (inhibition of proliferation and PAI promoter induction). Deletion of the PDZ binding motif abolishes both GIPC binding and the effects on TbetaRIII.","method":"Expression cloning, co-immunoprecipitation, cell surface expression assays, proliferation and reporter gene assays with mutant constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (co-IP, functional assays, mutant rescue) in a single comprehensive study","pmids":["11546783"],"is_preprint":false},{"year":2001,"finding":"GIPC1 PDZ domain binds to the C terminus of integrin alpha6A and alpha6B subunits, and also alpha5 integrin. The alpha6A and alpha5 subunits contain a type I PDZ binding site (TSDA), while alpha6B contains a novel PDZ-binding motif (ESYS) requiring a negatively charged residue at position -1 or -3. GIPC1 and alpha6 integrin colocalize in retraction fibers.","method":"Yeast two-hybrid, in vitro binding assays with purified peptides, truncation analysis, immunofluorescence colocalization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro peptide binding + yeast two-hybrid + colocalization, with systematic mutant analysis defining binding rules","pmids":["11479315","11852236"],"is_preprint":false},{"year":2001,"finding":"GIPC1 PDZ domain interacts with the cytoplasmic tail of melanosomal membrane protein gp75 (TRP-1/TYRP1) via the C-terminal SVV residues of gp75. Only newly synthesized gp75 associates with GIPC1 predominantly in the juxtanuclear Golgi region, suggesting a role in biosynthetic sorting to melanosomes.","method":"Yeast two-hybrid, co-immunoprecipitation, synchronized biosynthesis assay, immunofluorescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, co-IP, and temporal biosynthesis assay in single lab","pmids":["11441007"],"is_preprint":false},{"year":2002,"finding":"The Xenopus GIPC homolog (xGIPC) binds to the intracellular domain of the IGF-1 receptor independent of kinase activity. Injection of C-terminal truncation mutants retaining the PDZ domain blocked IGF-1-induced MAP kinase activation and oocyte maturation. Full-length xGIPC enhanced RGS-GAIP stimulation of insulin response in oocytes.","method":"Xenopus oocyte injection, yeast two-hybrid or binding assays, MAP kinase activation assay, maturation assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional loss-of-function in Xenopus oocytes with defined phenotype, single lab","pmids":["11751850"],"is_preprint":false},{"year":2002,"finding":"GIPC1 interacts with megalin (LRP2) in renal proximal tubule epithelial cells. GST-GIPC specifically binds megalin in precipitation assays. GIPC1, GAIP, and Galphai3 cosediment with megalin in brush border and microvillar fractions, and GIPC1 is localized in clathrin-coated pits and apical tubules of endocytic compartments.","method":"GST pull-down, cell fractionation, immunoelectron microscopy, immunofluorescence","journal":"Journal of the American Society of Nephrology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GST pull-down plus IEM and fractionation in single lab","pmids":["11912251"],"is_preprint":false},{"year":2003,"finding":"GIPC1 co-immunoprecipitates with the beta1-adrenergic receptor (beta1-AR) in COS-7 cells via an interaction requiring the Ser residue of the ESKV C-terminal motif. GIPC1 expression substantially decreases beta1-AR-stimulated, Gi-mediated ERK1/2 activation (inhibited by pertussis toxin) but has no effect on receptor sequestration or cAMP accumulation.","method":"Yeast two-hybrid, co-immunoprecipitation, cAMP assay, ERK1/2 phosphorylation assay, pertussis toxin treatment","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus functional assays with specific mutant controls, single lab","pmids":["12724327"],"is_preprint":false},{"year":2003,"finding":"GIPC1 PDZ domain interacts specifically with dopamine D2 and D3 receptors (but not D4 receptor) via their C-terminal sequences. GIPC1 co-internalizes with D2R and D3R, reduces D3R signaling, and sequesters receptors in sorting vesicles to prevent lysosomal degradation. GIPC1 dimerization is required for its scaffolding function.","method":"Yeast two-hybrid, pull-down, affinity chromatography with recombinant and endogenous proteins, immunofluorescence colocalization, internalization assays, signaling assays","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical and cell biological methods in single comprehensive study","pmids":["14617818"],"is_preprint":false},{"year":2003,"finding":"GIPC1 interacts with human lutropin receptor (hLHR) via its PDZ domain binding to the C-terminal tetrapeptide of hLHR. siRNA knockdown of GIPC1 reduces recycling of internalized hormone and lowers steady-state hLHR density at the cell surface.","method":"Yeast two-hybrid, pull-down, co-immunoprecipitation, siRNA knockdown, receptor trafficking assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid, co-IP, siRNA functional assay in single lab","pmids":["14507927"],"is_preprint":false},{"year":2004,"finding":"GIPC1 is required for recruitment of GAIP (RGS19) to the dopamine D2 receptor at the plasma membrane. D2R activation drives dynamic translocation of GAIP to the plasma membrane via GIPC1 scaffolding. The GTPase activity of GAIP regulates two D2R-mediated responses in a GIPC1-dependent manner, establishing GIPC1 as a required component of a GPCR-RGS signaling complex.","method":"Co-immunoprecipitation, membrane translocation assay, functional signaling assays, cell fractionation","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and functional signaling assays, single lab","pmids":["15356268"],"is_preprint":false},{"year":2005,"finding":"GIPC1 contains two myosin VI binding domains in its C terminus, with separate N-terminal oligomerization and C-terminal myosin VI binding functions. The myosin VI binding domain is necessary for intracellular interactions with myosin VI and for recruitment of myosin VI to membrane structures. GIPC1/myosin VI complexes move in cellular extensions in an actin-dependent and microtubule-independent manner. Blocking either GIPC1-myosin VI or GLUT1-GIPC1 interactions disrupts GLUT1 trafficking in polarized epithelial cells, reducing plasma membrane GLUT1.","method":"Deletion mutant analysis, co-immunoprecipitation, live-cell imaging, pharmacological actin/microtubule inhibitors, GLUT1 trafficking assay in polarized cells","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — systematic mutant analysis with multiple orthogonal functional assays establishing mechanistic domain requirements","pmids":["15975910"],"is_preprint":false},{"year":2005,"finding":"HPV-18 E6 protein interacts with TIP-2/GIPC1 and triggers its polyubiquitination and proteasome-mediated degradation. This reduces GIPC1 levels in HeLa cells and impairs TGF-beta signaling (reduces Id3 induction and antiproliferative effect of TGF-beta). siRNA silencing of E6 restores GIPC1 levels and TGF-beta responsiveness.","method":"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor experiments, reporter gene assay, cell proliferation assay","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, proteasome inhibitor validation, and siRNA rescue in single lab","pmids":["15767424"],"is_preprint":false},{"year":2006,"finding":"GIPC1 (synectin) is required for internalization of cell surface receptors and for coupling of myosin VI to uncoated endocytic vesicles (UCV). The mechanism involves PDZ domain engagement by C termini of internalized receptors (e.g., megalin), which in trans facilitates myosin VI binding to the GIPC1 C terminus outside the PDZ domain. In GIPC1-null mice, megalin is mistargeted in renal proximal tubules causing proteinuria.","method":"siRNA knockdown, deletion mutant analysis, in vivo knockout mouse phenotype (proteinuria, megalin mislocalization), endocytic assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo null mouse phenotype plus mechanistic in trans recruitment model validated by deletion mutants","pmids":["16908842"],"is_preprint":false},{"year":2006,"finding":"APPL1 is identified as a TrkA-associated protein that binds to GIPC1 via its C-terminal sequence engaging the GIPC1 PDZ domain. APPL1, GIPC1, and phosphorylated TrkA co-enrich in the same endosomal fractions. Knockdown of either APPL1 or GIPC1 suppresses NGF-dependent MEK, ERK, and Akt activation and neurite outgrowth in PC12 cells.","method":"Mass spectrometry from rat brain lysate, co-immunoprecipitation in sympathetic neurons, high-resolution endosomal fractionation, siRNA knockdown with signaling and neurite outgrowth readouts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — mass spectrometry identification replicated by co-IP in neurons, endosomal fractionation, functional siRNA knockdown with multiple signaling readouts","pmids":["17000777"],"is_preprint":false},{"year":2006,"finding":"Endogenous GIPC1 binds to the C terminus of APPL (a Rab5 effector) via its PDZ domain. Upon NGF/TrkA activation, GIPC1 and APPL translocate to peripheral endocytic vesicles carrying TrkA. GIPC1's interaction with APPL is essential for GIPC1 recruitment to peripheral endosomes; a GIPC1 PDZ mutant unable to bind APPL inhibits NGF-induced GIPC1 recruitment, MAPK activation, and neurite outgrowth. GIPC1 depletion slows endocytosis and trafficking of TrkA to EEA1 early endosomes.","method":"Co-immunoprecipitation, GIPC1 PDZ mutant overexpression, siRNA knockdown, immunofluorescence live tracking, MAPK phosphorylation assay, neurite outgrowth assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — PDZ mutant epistasis plus siRNA with multiple orthogonal functional readouts in single comprehensive study","pmids":["17015470"],"is_preprint":false},{"year":2007,"finding":"GIPC1 associates with surface and internalized NMDA receptors in heterologous cells and colocalizes with a population of NMDA receptors on the cell surface of neurons. GIPC1 is mainly excluded from synapses. Changes in GIPC1 expression alter the number of surface (extrasynaptic) NMDA receptors without changing total synaptic receptor numbers.","method":"Co-immunoprecipitation, immunofluorescence in neurons, surface receptor quantification upon GIPC1 overexpression/knockdown","journal":"The Journal of neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP and loss/gain-of-function with surface receptor quantification, single lab","pmids":["17959809"],"is_preprint":false},{"year":2008,"finding":"Endoglin interacts with GIPC1 via a Class I PDZ binding motif in the cytoplasmic domain of endoglin. GIPC1 promotes cell surface retention of endoglin in a TGF-beta-independent manner. Endoglin-GIPC1 interaction specifically enhances TGF-beta1-induced Smad 1/5/8 phosphorylation and a Smad 1/5/8 responsive promoter, and inhibits endothelial cell migration; all dependent on the endoglin-GIPC1 interaction.","method":"Co-immunoprecipitation, immunofluorescence confocal microscopy, subcellular distribution studies, Smad phosphorylation assay, reporter assay, cell migration assay with PDZ-binding mutant constructs","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP, colocalization, and multiple functional assays with mutant rescue, single comprehensive study","pmids":["18775991"],"is_preprint":false},{"year":2009,"finding":"Neuropilin-1 (Nrp1) promotes alpha5beta1 integrin-mediated endothelial cell adhesion to fibronectin via its cytoplasmic SEA motif by binding GIPC1. GIPC1 interacts with both Nrp1 and alpha5beta1 integrin and, together with myosin VI, stimulates internalization of active alpha5beta1 into Rab5-positive early endosomes. GIPC1 and Myo6 knockdown reduces active alpha5beta1 endocytosis and EC adhesion to fibronectin.","method":"RNA interference, rescue with wild-type and mutant constructs, co-immunoprecipitation, live-cell imaging with Rab5-positive endosome markers, adhesion assays","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — siRNA knockdown plus mutant rescue, co-IP, and live imaging with multiple orthogonal functional readouts","pmids":["19175293"],"is_preprint":false},{"year":2009,"finding":"The cytoplasmic domain of TbetaRIII is essential for TbetaRIII-mediated attenuation of TGF-beta signaling and inhibition of breast cancer cell migration/invasion in vitro and tumor progression in vivo. The interaction between the TbetaRIII cytoplasmic domain and GIPC1 is mechanistically required for both TGF-beta signaling attenuation and invasion suppression.","method":"In vivo xenograft models, in vitro migration/invasion assays, TbetaRIII cytoplasmic domain deletion/mutant constructs, GIPC1 interaction assays","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo and in vitro functional assays with mutant constructs, single lab","pmids":["19955393"],"is_preprint":false},{"year":2009,"finding":"GIPC1 PDZ domain interaction with IGF-1R is essential for post-translational stability and maintenance of IGF-1R protein levels in pancreatic adenocarcinoma cells. siRNA knockdown of GIPC1 reduces IGF-1R protein levels and decreases cell proliferation. A PDZ domain-targeting peptide (PSQSSSEA) inhibits GIPC1-IGF-1R association and reduces tumor growth in vivo.","method":"siRNA knockdown, PDZ peptide inhibition, IGF-1R protein level assay, orthotopic tumor mouse model with bioluminescence","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA and peptide inhibitor with in vitro and in vivo functional readouts, single lab","pmids":["19509165"],"is_preprint":false},{"year":2010,"finding":"GIPC1 PDZ domain binds to the PDZ-binding motif at the C terminus of MyoGEF (a guanine nucleotide exchange factor). GIPC1 and MyoGEF colocalize at the cell leading edge. RNAi depletion of GIPC1 in MDA-MB-231 cells shifts cells from polarized to rounded morphology and dramatically decreases Matrigel invasion. An anti-MyoGEF peptide antibody blocking GIPC1-MyoGEF complex formation similarly disrupts cell polarization and invasion.","method":"In vitro and in vivo binding assays, co-immunoprecipitation, immunofluorescence, RNAi knockdown, Matrigel invasion assay, antibody-mediated complex disruption","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro and in vivo binding assays, RNAi, and antibody disruption with consistent functional readouts","pmids":["20634288"],"is_preprint":false},{"year":2011,"finding":"TGFbetaR3 interaction with GIPC1 (via the 3 C-terminal amino acids of TGFbetaR3 required to bind GIPC1) is critical for epicardial cell invasion and proliferation in response to TGFbeta1, TGFbeta2, FGF2, and HMW-HA. Expression of TGFbetaR3 missing the PDZ-binding motif fails to rescue deficits in Tgfbr3-/- cells, while GIPC1 knockdown in wild-type cells decreases invasion.","method":"Mouse embryo epicardial cell cultures, TGFbetaR3 mutant rescue constructs, GIPC1 siRNA knockdown, invasion and proliferation assays","journal":"Developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic rescue with deletion mutant plus siRNA knockdown in primary cells, single lab","pmids":["21871877"],"is_preprint":false},{"year":2011,"finding":"TGFbetaR3 interaction with GIPC1 is absolutely required for TGFbeta2- or BMP-2-stimulated endothelial-to-mesenchymal transformation (EMT) in atrioventricular endocardial cushion explants. TGFbetaR3 lacking the C-terminal GIPC1-binding residues or TGFbetaR3 without its entire cytoplasmic domain fails to support EMT. GIPC1 overexpression enhances EMT while GIPC1 siRNA silencing inhibits it.","method":"AVC explant EMT assay, mutant TGFbetaR3 constructs, GIPC1 overexpression and siRNA knockdown","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with mutant rescue in primary tissue explant system, single lab","pmids":["21945156"],"is_preprint":false},{"year":2012,"finding":"Gipc1 interacts with Vangl2 (a core PCP protein), and a myosin VI-Gipc1 complex regulates Vangl2 trafficking in heterologous cells. In MyoVI mutant mouse cochlea, Vangl2 membrane presence is increased. Disruption of Gipc1 function in hair cells causes maturation defects including hair bundle orientation and integrity defects. STED microscopy shows enrichment of Vangl2 on the supporting cell side adjacent to proximal hair cell membrane.","method":"Co-immunoprecipitation, heterologous cell trafficking assay, MyoVI mutant mouse analysis, in vivo Gipc1 disruption, STED microscopy","journal":"Development","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple methods including genetic mouse model, trafficking assay, and super-resolution microscopy","pmids":["22991442"],"is_preprint":false},{"year":2012,"finding":"GIPC1 directly binds the PDZ binding motif (SVV) of LPA1 receptor but not other LPA receptors. LPA1 colocalizes and coimmunoprecipitates with GIPC1 and APPL on APPL signaling endosomes. GIPC1 siRNA depletion disturbs LPA1 trafficking to EEA1 early endosomes and promotes LPA1-mediated Akt signaling, cell proliferation, and cell motility.","method":"Co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, Akt signaling assay, cell proliferation and motility assays","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, colocalization, siRNA with multiple functional readouts, single lab","pmids":["23145131"],"is_preprint":false},{"year":2017,"finding":"Crystal structures reveal that GIPC1 forms a domain-swapped dimer in an autoinhibited conformation that blocks binding of both PlexinD1 and myosin VI. PlexinD1 binding to GIPC1 releases autoinhibition, enabling myosin VI interaction. GIPCs and myosin VI interact through two distinct interfaces and form an open-ended alternating oligomeric array that underlies GIPC/myosin VI complex oligomerization in solution and cells.","method":"Crystal structure determination (multiple structures in apo and bound states), solution binding assays, cell-based validation of oligomerization","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple crystal structures of apo and bound states with cell-based validation, single comprehensive structural study","pmids":["28537552"],"is_preprint":false},{"year":2019,"finding":"GIPC proteins negatively modulate PlexinD1 signaling during vascular development. Zebrafish expressing Plxnd1 with impaired GIPC binding show low-penetrance angiogenesis deficits and hypersensitivity to antiangiogenic drugs. gipc mutant zebrafish show angiogenic impairments ameliorated by reducing Plxnd1 signaling. GIPC depletion in cultured endothelial cells potentiates SEMA-PLXND1 signaling, establishing GIPC as a negative modulator of antiangiogenic PLXND1 signaling through endocytic trafficking.","method":"Zebrafish CRISPR/endogenous mutation, genetic epistasis (gipc mutant + plxnd1 reduction), GIPC depletion in endothelial cells with SEMA-PLXND1 signaling readout, antiangiogenic drug treatment","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo genetic epistasis in zebrafish plus in vitro signaling assays, multiple orthogonal approaches","pmids":["31050647"],"is_preprint":false},{"year":2020,"finding":"GIPC1 upregulates IGFBP-3 expression downstream of TGF-beta in hepatic stellate cells via epigenetic mechanisms: GIPC1 increases H3K27 acetylation and decreases H3K27me3 at the IGFBP-3 locus. IGFBP-3 promotes HSC migration through integrin-dependent phosphorylation of Akt. Global IGFBP-3 knockout mice show attenuation of HSC activation and portal pressure in chronic liver injury.","method":"mRNA sequencing, qPCR, ELISA, chromatin immunoprecipitation (ChIP), Western blot, siRNA knockdown, in vivo knockout mouse model, Akt phosphorylation assay","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP epigenetic analysis plus in vivo knockout, single lab, multiple methods","pmids":["32447051"],"is_preprint":false},{"year":2021,"finding":"GIPC1 mediates actin-based retrograde transport of Drp1 (a mitochondrial fission GTPase) toward perinuclear mitochondria. Drp1 interacts with GIPC1 through an atypical C-terminal PDZ-binding motif. Loss of this interaction causes Drp1 cytoplasmic mislocalization and reduced mitochondrial fission despite normal GTPase activity. GIPC1 potentiates Drp1-driven cancer cell proliferation and migration.","method":"Proteomic interactome screening, co-immunoprecipitation, live-cell imaging (retrograde transport tracking), mitochondrial fission assay, cell proliferation and migration assays with GIPC1 loss-of-function","journal":"Molecular biology of the cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, live imaging, and loss-of-function functional assays, single lab","pmids":["34705526"],"is_preprint":false},{"year":2021,"finding":"GIPC1 interacts with SR-B1 (scavenger receptor class B type 1) and stabilizes it by negatively regulating its proteasomal and lysosomal degradation. Co-immunoprecipitation with wild-type and mutant GIPC1 in overexpressing cells, native liver cells, and mouse liver tissues confirms the interaction. GIPC1 overexpression increases SR-B1 protein levels and HDL-cholesterol/CE uptake; GIPC1 silencing in mouse liver reduces SR-B1 levels and elevates plasma TG/TC.","method":"Co-immunoprecipitation (wild-type and mutant constructs, native cells, mouse tissues), siRNA knockdown in vivo, overexpression assay, cholesterol uptake assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP validated in multiple systems plus in vivo siRNA with metabolic readouts, single lab","pmids":["33811857"],"is_preprint":false},{"year":2022,"finding":"The GIPC myosin-interacting region (MIR) releases an autoinhibitory interaction within myosin VI, causing conformational changes including increased lever arm flexibility and increased flexibility of the adaptor-motor linkage. This increases actomyosin association/dissociation rates and stimulates a 2-3 fold increase in ensemble cargo transport speed, while GIPC MIR-myosin VI ensembles yield run lengths similar to forced processive dimers.","method":"Motility assays, FRET-based conformational sensors, optical trapping, DNA origami-based cargo scaffolds","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstituted in vitro biophysical assays with multiple orthogonal methods including FRET and optical trapping, defining molecular mechanism","pmids":["35143838"],"is_preprint":false},{"year":2015,"finding":"GIPC1 interacts directly with IGF1R and participates in Akt1 activation. In mouse embryonic stem cells, dominant-negative GIPC1 overexpression or GIPC1 knockdown inhibits eye field cell development. Pharmacological inhibition of Akt1 phosphorylation mimics the dominant-negative GIPC1 phenotype, supporting a GIPC1-PI3K-Akt1 pathway in eye field specification.","method":"Dominant-negative construct overexpression, siRNA knockdown, co-immunoprecipitation (GIPC1-IGFR), Akt1 inhibitor treatment, directed differentiation assay from mESCs","journal":"Stem cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus loss-of-function and pharmacological rescue in stem cell differentiation model, single lab","pmids":["26013465"],"is_preprint":false},{"year":2016,"finding":"Drd3 palmitoylation acts as a molecular switch for GIPC1-dependent biased signaling. De-palmitoylation enables Helix-8 of Drd3 to move out into aqueous environment for interaction with GIPC1 PDZ domain. Biochemical studies, live imaging, and mutant protein analysis show that palmitoylation regulates Drd3-GIPC1 interaction and affects receptor trafficking and signaling.","method":"Molecular dynamics simulations, biochemical interaction assays, live-cell imaging, palmitoylation mutant analysis","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — computational modeling supported by biochemical and cell imaging data, single lab","pmids":["26787837"],"is_preprint":false},{"year":2024,"finding":"GIPC1 interacts with the beta1-adrenergic receptor and stabilizes its expression by preventing ubiquitination and degradation. Cardiomyocyte-specific GIPC1 knockout mice develop spontaneous cardiac hypertrophy, fibrosis, and systolic dysfunction. AAV9-mediated GIPC1 overexpression attenuates isoproterenol-induced pathological cardiac remodeling. GIPC1 maintains the balance of beta1-AR/beta2-AR and inhibits hyperactivation of MAPK signaling.","method":"Conditional knockout mice (Myh6-cre), AAV9 overexpression, echocardiography, histology, co-immunoprecipitation, ubiquitination assay, MAPK signaling analysis","journal":"European journal of pharmacology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout and AAV rescue in vivo with multiple orthogonal readouts plus mechanistic co-IP and ubiquitination assays","pmids":["38458410"],"is_preprint":false},{"year":2023,"finding":"GIPC1 functions both as a protein binding partner of MACC1 (identified by yeast two-hybrid, mass spectrometry, co-IP, and peptide array) and as a transcription factor binding to the MACC1 promoter (TSS to -60 bp, confirmed by chromatin IP and EMSA). GIPC1 knockdown reduces endogenous MACC1 expression, diminishes MACC1-induced cell migration and invasion, and reduces tumor growth and metastasis in vivo.","method":"Yeast two-hybrid, mass spectrometry, co-immunoprecipitation, peptide array, chromatin immunoprecipitation, EMSA, siRNA knockdown, in vivo metastasis model","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods identifying dual protein/transcription factor function, single lab","pmids":["38144523"],"is_preprint":false},{"year":2026,"finding":"GIPC1 interacts with mitochondrial DECR1 (2,4-dienoyl-CoA reductase) via its PDZ domain (co-IP/MS, molecular docking, surface plasmon resonance showing KD=16.3 nM). GIPC1 facilitates actin-dependent transport of DECR1 into mitochondria, maintaining redox homeostasis and suppressing ferroptosis. Cardiac-specific GIPC1 knockout disrupts mitochondrial fatty acid metabolism, increases PUFA-containing phospholipids, and promotes ferroptosis. DECR1 overexpression rescues GIPC1 ablation-induced ferroptosis.","method":"Co-IP/mass spectrometry, molecular docking, surface plasmon resonance, co-immunoprecipitation, immunofluorescence, cardiac-specific knockout mouse, proteomic and lipidomic analysis, rescue experiments","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — SPR binding constants, co-IP/MS, in vivo knockout with omics, and genetic rescue with DECR1 overexpression","pmids":["41787053"],"is_preprint":false},{"year":2009,"finding":"Interaction of hepatitis B virus core protein (HBc) with human GIPC1 was demonstrated via yeast two-hybrid screening of a human liver cDNA library. The PDZ domain of GIPC1 is sufficient for interaction with HBc, and the putative C-terminal PDZ-interacting motif of HBc is important for this interaction.","method":"Yeast two-hybrid screening, deletion analysis of PDZ domain","journal":"Archives of virology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single yeast two-hybrid method, no in-cell or in vitro validation, single lab","pmids":["20091192"],"is_preprint":false},{"year":2011,"finding":"In human primary melanocytes, GIPC1 interacts with APPL (adaptor protein with PH domain) which co-precipitates with newly synthesized TRP1. APPL exists in a complex with GIPC1 and phospho-AKT. PI3-kinase inhibition abolishes GIPC1-APPL interaction and retards TRP1 in the Golgi. Knockdown of either GIPC1 or APPL inhibits melanogenesis by decreasing tyrosinase protein levels and activity.","method":"Co-immunoprecipitation, PI3K inhibitor treatment, siRNA knockdown, tyrosinase activity assay, immunofluorescence","journal":"Archives of biochemistry and biophysics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, pharmacological inhibition, and siRNA with functional readouts in primary melanocytes, single lab","pmids":["21291857"],"is_preprint":false},{"year":2004,"finding":"CD93 cytoplasmic tail binds to GIPC1 PDZ domain via a newly identified Class I PDZ-binding domain at the CD93 C terminus. Four positively charged juxtamembrane residues of CD93 stabilize this interaction. A cell-permeable peptide encoding the C-terminal 11 amino acids of CD93 enhances phagocytosis in human monocytes.","method":"Yeast two-hybrid, GST fusion protein pull-down assay, cell-permeable peptide treatment, phagocytosis assay","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid plus GST pull-down with functional peptide assay, single lab","pmids":["15459234"],"is_preprint":false},{"year":2015,"finding":"VEGF-A/NRP1 signaling induces co-immunoprecipitable interactions between NRP1 and GIPC1, and complex formation between GIPC1 and Syx (a RhoGEF). GIPC1 or Syx knockdown reduces active RhoA and cell proliferation. Constitutively active RhoA restores proliferation in siVEGF-A cells, and GIPC1/Syx complex disruption by a cell-penetrating peptide inhibits RhoA activation and proliferation.","method":"Co-immunoprecipitation, siRNA knockdown, RhoA activity assay, constitutively active RhoA rescue, cell-penetrating peptide disruption, proliferation assay","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP, genetic knockdown, and rescue with constitutively active RhoA, single lab","pmids":["26209534"],"is_preprint":false}],"current_model":"GIPC1 is a PDZ domain-containing scaffolding/adaptor protein that uses its PDZ domain to bind the C-terminal PDZ-binding motifs of diverse transmembrane receptors (TrkA, TGFbetaRIII, NRP1, IGF1R, GLUT1, integrins, GPCRs including dopamine D2/D3 and beta1-AR, megalin, LPA1, SR-B1, and others) and cytoplasmic proteins (GAIP/RGS19, APPL1, MyoGEF, Drp1, DECR1), and its C-terminal GH2 domain recruits myosin VI; GIPC1 exists in an autoinhibited domain-swapped dimer that is activated by cargo binding to promote myosin VI-dependent endocytic trafficking and recycling of cargo receptors, while also scaffolding RGS proteins to GPCRs for signal attenuation, assembling signaling endosomes (with APPL1 and RTKs) for PI3K-Akt activation, facilitating Drp1 retrograde transport for mitochondrial fission, and regulating the stability of cell-surface receptors including beta1-AR and SR-B1 by preventing their ubiquitin-mediated degradation."},"narrative":{"mechanistic_narrative":"GIPC1 is a cytosolic PDZ-domain scaffolding/adaptor protein that couples the cytoplasmic C-termini of diverse transmembrane receptors to the actin-based motor myosin VI, thereby controlling receptor endocytosis, trafficking, recycling, and signaling output [PMID:9770488, PMID:15975910, PMID:16908842]. Through its single PDZ domain it engages defined C-terminal PDZ-binding motifs on a broad array of partners—the RGS protein GAIP/RGS19 [PMID:9770488], GLUT1 [PMID:10198040], TrkA [PMID:11251075], TGF-beta receptors TbetaRIII and endoglin [PMID:11546783, PMID:18775991], integrin alpha-subunits [PMID:11479315, PMID:11852236], dopamine D2/D3 receptors [PMID:14617818], beta1-adrenergic receptor [PMID:12724327], megalin [PMID:11912251], neuropilin-1 and PlexinD1 [PMID:19175293, PMID:28537552], and LPA1 [PMID:23145131]—while its C-terminal myosin-interacting region recruits myosin VI [PMID:15975910]. Crystallographic and biophysical work shows GIPC1 forms an autoinhibited domain-swapped dimer; cargo binding to the PDZ domain releases autoinhibition to permit myosin VI engagement and assembly of an alternating GIPC1/myosin VI oligomeric array, and the GIPC1 myosin-interacting region relieves myosin VI autoinhibition to accelerate ensemble cargo transport [PMID:28537552, PMID:35143838]. Receptor C-termini bound in the PDZ pocket act in trans to license myosin VI recruitment and couple internalized cargo to uncoated endocytic vesicles, a function required in vivo for correct megalin targeting in renal proximal tubules [PMID:16908842]. On this trafficking platform GIPC1 assembles APPL1-containing signaling endosomes that sustain TrkA- and LPA1-driven MEK/ERK and PI3K-Akt signaling and neurite outgrowth [PMID:17000777, PMID:17015470, PMID:23145131], scaffolds GAIP/RGS19 to GPCRs to attenuate Gi-mediated signaling [PMID:15356268, PMID:12724327], and stabilizes cell-surface receptors including beta1-AR and SR-B1 by preventing their ubiquitin- and proteasome/lysosome-mediated degradation [PMID:38458410, PMID:33811857]. Beyond plasma-membrane cargo, GIPC1 mediates actin-dependent retrograde transport of the fission GTPase Drp1 to promote mitochondrial fission [PMID:34705526] and of DECR1 into mitochondria to maintain redox homeostasis and suppress ferroptosis [PMID:41787053]. Through these activities GIPC1 functions in TGF-beta-dependent EMT and epicardial/endocardial development [PMID:21871877, PMID:21945156], PCP-regulated cochlear hair-cell maturation via Vangl2 trafficking [PMID:22991442], PlexinD1-dependent angiogenesis [PMID:31050647], and cardiac homeostasis, where cardiomyocyte-specific loss causes spontaneous hypertrophy and dysfunction [PMID:38458410].","teleology":[{"year":1998,"claim":"Established GIPC1 as a PDZ-domain protein with a specific binding partner, defining its founding identity as a selective scaffold rather than a generic adaptor.","evidence":"Yeast two-hybrid, GST pull-down, deletion analysis and immunoelectron microscopy identifying the GAIP/RGS19 SEA-motif interaction and partitioning between cytosolic and vesicle-associated pools","pmids":["9770488"],"confidence":"High","gaps":["Did not establish what cargo the membrane-associated vesicle pool carries","No functional consequence for GAIP-mediated GTPase signaling demonstrated"]},{"year":1999,"claim":"Showed GIPC1 binds receptor and cytoskeletal/motor partners isoform-specifically, framing it as an adapter that links transmembrane cargo to the cytoskeleton and myosin VI.","evidence":"Yeast two-hybrid, GST pull-down and co-IP with native GLUT1, plus interactions with myosin VI, alpha-actinin-1 and KIF-1B","pmids":["10198040"],"confidence":"High","gaps":["Did not define the domain architecture for motor binding versus cargo binding","No direct transport or trafficking assay"]},{"year":2001,"claim":"Defined GIPC1 as a multi-receptor PDZ adaptor that regulates receptor surface stability and signaling output across RTKs, TGF-beta receptors, integrins and biosynthetic cargo.","evidence":"Co-IP, expression cloning, peptide binding, cell-surface and reporter assays for TrkA, TbetaRIII, integrin alpha-subunits and gp75/TYRP1","pmids":["11251075","11546783","11479315","11852236","11441007"],"confidence":"High","gaps":["Mechanism linking PDZ binding to altered surface stability not resolved","Whether a single GIPC1 molecule services all cargos or distinct pools dedicated to each"]},{"year":2003,"claim":"Demonstrated GIPC1 controls GPCR fate and signaling, sequestering internalized dopamine receptors from lysosomal degradation and attenuating Gi-coupled ERK signaling, with dimerization required for scaffolding.","evidence":"Yeast two-hybrid, pull-down, internalization and signaling assays for D2/D3 receptors and beta1-AR with mutant and pertussis-toxin controls","pmids":["14617818","12724327"],"confidence":"High","gaps":["Structural basis of the required dimerization not yet defined","How GIPC1 selects between recycling and anti-degradative routing unclear"]},{"year":2004,"claim":"Positioned GIPC1 as an obligatory component of a GPCR-RGS signaling module, showing it recruits GAIP/RGS19 to an active receptor at the membrane.","evidence":"Co-IP, agonist-driven membrane translocation, and GAIP GTPase-dependent functional signaling assays at the dopamine D2 receptor","pmids":["15356268"],"confidence":"Medium","gaps":["Single lab; reciprocal validation of the translocation mechanism limited","Generality across other Gi-coupled receptors not tested here"]},{"year":2005,"claim":"Resolved GIPC1 domain logic—separable N-terminal oligomerization and C-terminal myosin VI binding—and showed actin-dependent, microtubule-independent motility of GIPC1/myosin VI complexes is required for cargo (GLUT1) trafficking.","evidence":"Deletion mutant mapping, co-IP, live-cell imaging with cytoskeletal inhibitors, and GLUT1 trafficking assays in polarized epithelia","pmids":["15975910"],"confidence":"High","gaps":["How cargo binding gates motor recruitment not yet structurally explained","Directionality and processivity of transport not directly measured"]},{"year":2006,"claim":"Established the in trans recruitment model and in vivo necessity: receptor PDZ engagement licenses myosin VI binding to couple cargo to uncoated endocytic vesicles, with megalin mistargeting causing proteinuria in GIPC1-null mice.","evidence":"siRNA, deletion analysis, endocytic assays and GIPC1-null mouse renal phenotype; plus identification of APPL1 endosomal signaling complex with TrkA","pmids":["16908842","17000777","17015470"],"confidence":"High","gaps":["How the trans-recruitment is regulated to prevent constitutive motor engagement","Whether APPL endosome assembly is mechanistically separable from myosin VI transport"]},{"year":2008,"claim":"Extended GIPC1's receptor-stabilizing role to TGF-beta superfamily co-receptors and linked it to pathway-selective Smad signaling and cell migration control.","evidence":"Reciprocal co-IP, colocalization, Smad1/5/8 phosphorylation, reporter and migration assays with endoglin PDZ-motif mutants","pmids":["18775991"],"confidence":"High","gaps":["Mechanism by which GIPC1 biases TGF-beta toward Smad1/5/8 not defined","Trafficking step responsible for surface retention not pinpointed"]},{"year":2009,"claim":"Connected GIPC1/myosin VI-driven integrin endocytosis to neuropilin-1-promoted adhesion and migration, and tied GIPC1-receptor binding to cancer-relevant signaling, invasion suppression and IGF1R protein stability.","evidence":"siRNA with mutant rescue, co-IP, Rab5 endosome live imaging and adhesion assays (NRP1/alpha5beta1); in vivo xenograft and tumor-growth models for TbetaRIII and IGF1R","pmids":["19175293","19955393","19509165"],"confidence":"Medium","gaps":["Whether IGF1R stabilization is a direct trafficking effect or indirect","Reconciliation of pro-adhesion versus invasion-suppressive roles across cell types"]},{"year":2012,"claim":"Broadened GIPC1's developmental reach—PCP protein Vangl2 trafficking in cochlear hair cells and LPA1 endosomal sorting that restrains Akt-driven proliferation/motility.","evidence":"Co-IP, heterologous trafficking assays, MyoVI mutant mouse and STED microscopy (Vangl2); co-IP, colocalization and siRNA with signaling readouts (LPA1)","pmids":["22991442","23145131"],"confidence":"High","gaps":["How GIPC1/myosin VI directs asymmetric Vangl2 localization not fully resolved","Whether LPA1 sorting outcome generalizes to other GPCRs"]},{"year":2017,"claim":"Provided the structural mechanism for autoinhibition and cargo-triggered activation, showing GIPC1 is a domain-swapped dimer whose PlexinD1 binding releases inhibition to permit myosin VI engagement and oligomeric array formation.","evidence":"Multiple apo and bound crystal structures with solution binding and cell-based oligomerization validation","pmids":["28537552"],"confidence":"High","gaps":["Whether all cargos relieve autoinhibition identically","Stoichiometry of the transport-competent array in vivo not defined"]},{"year":2019,"claim":"Defined GIPC1 as an in vivo negative modulator of antiangiogenic PlexinD1 signaling, acting through endocytic trafficking during vascular development.","evidence":"Zebrafish genetic epistasis between gipc and plxnd1 mutants plus endothelial-cell SEMA-PLXND1 signaling assays","pmids":["31050647"],"confidence":"High","gaps":["Trafficking step that limits PlexinD1 signaling not pinpointed","Relationship to angiogenic versus other GIPC1 cargos in endothelium"]},{"year":2021,"claim":"Showed GIPC1 mediates actin-based retrograde transport of the mitochondrial fission GTPase Drp1 and stabilizes the lipoprotein receptor SR-B1 against degradation, extending its role to organelle dynamics and lipid metabolism.","evidence":"Interactome screening, co-IP, retrograde-transport live imaging and fission assays (Drp1); co-IP in multiple systems and in vivo siRNA with cholesterol-uptake readouts (SR-B1)","pmids":["34705526","33811857"],"confidence":"Medium","gaps":["Single-lab findings without reciprocal cross-validation","How GIPC1 distinguishes anti-degradative from transport functions for different cargos"]},{"year":2022,"claim":"Provided the biophysical mechanism of GIPC1-driven transport, showing its myosin-interacting region relieves myosin VI autoinhibition and accelerates ensemble cargo movement.","evidence":"Reconstituted motility assays, FRET conformational sensors, optical trapping and DNA-origami cargo scaffolds","pmids":["35143838"],"confidence":"High","gaps":["In vivo confirmation of the predicted speed increase on native cargo","How cargo identity modulates ensemble size and run length"]},{"year":2024,"claim":"Demonstrated a physiological cardiac role: GIPC1 stabilizes beta1-AR against ubiquitin-mediated degradation and restrains MAPK hyperactivation, with cardiomyocyte loss causing spontaneous hypertrophy and dysfunction rescued by overexpression.","evidence":"Conditional knockout and AAV9-rescue mice with echocardiography, histology, co-IP, ubiquitination and MAPK signaling analyses","pmids":["38458410"],"confidence":"High","gaps":["Whether anti-ubiquitination is direct or via trafficking","Contribution of beta1/beta2-AR balance versus other GIPC1 cargos to the cardiac phenotype"]},{"year":2026,"claim":"Identified a mitochondrial protective function: GIPC1 binds and delivers DECR1 into mitochondria via actin-dependent transport to maintain redox homeostasis and suppress ferroptosis, with cardiac knockout disrupting fatty-acid metabolism.","evidence":"Co-IP/MS, SPR (KD=16.3 nM), docking, cardiac-specific knockout with proteomics/lipidomics and DECR1-overexpression rescue","pmids":["41787053"],"confidence":"High","gaps":["Mechanism of mitochondrial import handoff after actin transport not defined","Relationship to the Drp1 transport role in the same compartment"]},{"year":null,"claim":"How GIPC1 selects among its dozens of competing PDZ cargos and switches between recycling, anti-degradative stabilization, and retrograde organelle transport in a single cell remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No quantitative model of cargo competition for the single PDZ pocket","Regulatory inputs that select trafficking versus stabilization outcomes unknown","Reported transcription-factor function at the MACC1 promoter not reconciled with the cytoplasmic scaffold role"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,12,14,27]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[1,12,32]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[8,11,28,35]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,7,14,16]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[16,19,26]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[5,39]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[11,17]},{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[30,37]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[12,14,16,19]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,8,18,28]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[25,30,37]}],"complexes":["GIPC1/myosin VI transport complex","GIPC1/APPL1 signaling endosome"],"partners":["MYO6","RGS19","APPL1","NRP1","TGFBR3","DRD3","ADRB1","DRP1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O14908","full_name":"PDZ domain-containing protein GIPC1","aliases":["GAIP C-terminus-interacting protein","RGS-GAIP-interacting protein","RGS19-interacting protein 1","Synectin","Tax interaction protein 2","TIP-2"],"length_aa":333,"mass_kda":36.0,"function":"May be involved in G protein-linked signaling","subcellular_location":"Cytoplasm; Membrane","url":"https://www.uniprot.org/uniprotkb/O14908/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GIPC1","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ARHGEF12","stoichiometry":4.0},{"gene":"MYO6","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/GIPC1","total_profiled":1310},"omim":[{"mim_id":"619089","title":"GIPC PDZ DOMAIN-CONTAINING FAMILY, MEMBER 2; GIPC2","url":"https://www.omim.org/entry/619089"},{"mim_id":"618940","title":"OCULOPHARYNGODISTAL MYOPATHY 2; OPDM2","url":"https://www.omim.org/entry/618940"},{"mim_id":"617029","title":"SEMAPHORIN 4B; SEMA4B","url":"https://www.omim.org/entry/617029"},{"mim_id":"608792","title":"GIPC PDZ DOMAIN-CONTAINING FAMILY, MEMBER 3; GIPC3","url":"https://www.omim.org/entry/608792"},{"mim_id":"605072","title":"GIPC PDZ DOMAIN-CONTAINING FAMILY, MEMBER 1; GIPC1","url":"https://www.omim.org/entry/605072"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cell Junctions","reliability":"Approved"},{"location":"Nucleoplasm","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"esophagus","ntpm":338.2}],"url":"https://www.proteinatlas.org/search/GIPC1"},"hgnc":{"alias_symbol":["TIP-2","Hs.6454","GIPC","SEMCAP","GLUT1CBP","SYNECTIN","NIP"],"prev_symbol":["C19orf3","RGS19IP1"]},"alphafold":{"accession":"O14908","domains":[{"cath_id":"2.30.42.10","chopping":"60-216","consensus_level":"medium","plddt":95.4887,"start":60,"end":216},{"cath_id":"1.10.150","chopping":"258-331","consensus_level":"high","plddt":87.9199,"start":258,"end":331}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O14908","model_url":"https://alphafold.ebi.ac.uk/files/AF-O14908-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O14908-F1-predicted_aligned_error_v6.png","plddt_mean":80.5},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GIPC1","jax_strain_url":"https://www.jax.org/strain/search?query=GIPC1"},"sequence":{"accession":"O14908","fasta_url":"https://rest.uniprot.org/uniprotkb/O14908.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O14908/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O14908"}},"corpus_meta":[{"pmid":"31367039","id":"PMC_31367039","title":"Plant cell-surface GIPC sphingolipids sense salt to trigger Ca2+ influx.","date":"2019","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/31367039","citation_count":367,"is_preprint":false},{"pmid":"19175293","id":"PMC_19175293","title":"Neuropilin-1/GIPC1 signaling regulates alpha5beta1 integrin traffic and function in endothelial cells.","date":"2009","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/19175293","citation_count":230,"is_preprint":false},{"pmid":"9770488","id":"PMC_9770488","title":"GIPC, a PDZ domain containing protein, interacts specifically with the C terminus of RGS-GAIP.","date":"1998","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/9770488","citation_count":202,"is_preprint":false},{"pmid":"11546783","id":"PMC_11546783","title":"A novel mechanism for regulating transforming growth factor beta (TGF-beta) signaling. Functional modulation of type III TGF-beta receptor expression through interaction with the PDZ domain protein, GIPC.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11546783","citation_count":168,"is_preprint":false},{"pmid":"10198040","id":"PMC_10198040","title":"Protein interactions with the glucose transporter binding protein GLUT1CBP that provide a link between GLUT1 and the cytoskeleton.","date":"1999","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/10198040","citation_count":167,"is_preprint":false},{"pmid":"11251075","id":"PMC_11251075","title":"GIPC and GAIP form a complex with TrkA: a putative link between G protein and receptor tyrosine kinase pathways.","date":"2001","source":"Molecular biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/11251075","citation_count":139,"is_preprint":false},{"pmid":"17000777","id":"PMC_17000777","title":"APPL1 associates with TrkA and GIPC1 and is 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GIPC1: Breast Cancer Biomarkers for Bone Metastasis Development and Treatment.","date":"2016","source":"Journal of the National Cancer Institute","url":"https://pubmed.ncbi.nlm.nih.gov/26757732","citation_count":73,"is_preprint":false},{"pmid":"11836570","id":"PMC_11836570","title":"Molecular cloning and characterization of human GIPC2, a novel gene homologous to human GIPC1 and Xenopus Kermit.","date":"2002","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/11836570","citation_count":71,"is_preprint":false},{"pmid":"11836571","id":"PMC_11836571","title":"Molecular cloning and characterization of human GIPC3, a novel gene homologous to human GIPC1 and GIPC2.","date":"2002","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/11836571","citation_count":68,"is_preprint":false},{"pmid":"14507927","id":"PMC_14507927","title":"GIPC binds to the human lutropin receptor (hLHR) through an unusual PDZ domain binding motif, and it 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The PDZ domain of GIPC binds the unique 11 amino acid C-terminus of GAIP (SEA motif) but does not interact with other RGS family members tested. GIPC exists in two pools: ~70% cytosolic and ~30% membrane-associated, with the membrane pool associating with clusters of vesicles near the plasma membrane.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down assays, deletion mutant analysis, immunofluorescence, immunoelectron microscopy, immunoblotting of membrane fractions\",\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 — multiple orthogonal methods (yeast two-hybrid, GST pull-down, deletion analysis, IEM) in a single rigorous study establishing a direct interaction\",\n      \"pmids\": [\"9770488\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"GIPC1 (GLUT1CBP) binds via its PDZ domain to the C terminus of GLUT1 glucose transporter in an isoform-specific manner (not GLUT3 or GLUT4), and also interacts with cytoskeletal proteins myosin VI, alpha-actinin-1, and KIF-1B, implicating GIPC1 as an adapter linking GLUT1 to the cytoskeleton.\",\n      \"method\": \"Yeast two-hybrid, GST pull-down, co-immunoprecipitation with native GLUT1 from cell membranes\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal binding assays (yeast two-hybrid, pulldown, co-IP with native protein), replicated across multiple interactions\",\n      \"pmids\": [\"10198040\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GIPC1 binds via its PDZ domain to the juxtamembrane region of TrkA NGF receptor, and together with GAIP forms a coprecipitable complex. GIPC1 colocalizes with phosphorylated TrkA in retrograde transport vesicles in neurites and cell bodies. Overexpression of GIPC1 in PC12 cells decreases NGF-induced ERK1/2 phosphorylation without affecting Akt, PLC-gamma1, or Shc phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation in HEK293T and PC12 cells, immunofluorescence colocalization, overexpression with ERK phosphorylation readout\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP in multiple cell types, colocalization, functional overexpression with specific signaling readout\",\n      \"pmids\": [\"11251075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GIPC1 PDZ domain interacts with a Class I PDZ binding motif in the cytoplasmic domain of TGF-beta type III receptor (TbetaRIII), stabilizing cell surface expression of TbetaRIII and enhancing TGF-beta signaling (inhibition of proliferation and PAI promoter induction). Deletion of the PDZ binding motif abolishes both GIPC binding and the effects on TbetaRIII.\",\n      \"method\": \"Expression cloning, co-immunoprecipitation, cell surface expression assays, proliferation and reporter gene assays with mutant constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (co-IP, functional assays, mutant rescue) in a single comprehensive study\",\n      \"pmids\": [\"11546783\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GIPC1 PDZ domain binds to the C terminus of integrin alpha6A and alpha6B subunits, and also alpha5 integrin. The alpha6A and alpha5 subunits contain a type I PDZ binding site (TSDA), while alpha6B contains a novel PDZ-binding motif (ESYS) requiring a negatively charged residue at position -1 or -3. GIPC1 and alpha6 integrin colocalize in retraction fibers.\",\n      \"method\": \"Yeast two-hybrid, in vitro binding assays with purified peptides, truncation analysis, immunofluorescence colocalization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro peptide binding + yeast two-hybrid + colocalization, with systematic mutant analysis defining binding rules\",\n      \"pmids\": [\"11479315\", \"11852236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"GIPC1 PDZ domain interacts with the cytoplasmic tail of melanosomal membrane protein gp75 (TRP-1/TYRP1) via the C-terminal SVV residues of gp75. Only newly synthesized gp75 associates with GIPC1 predominantly in the juxtanuclear Golgi region, suggesting a role in biosynthetic sorting to melanosomes.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, synchronized biosynthesis assay, immunofluorescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, co-IP, and temporal biosynthesis assay in single lab\",\n      \"pmids\": [\"11441007\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The Xenopus GIPC homolog (xGIPC) binds to the intracellular domain of the IGF-1 receptor independent of kinase activity. Injection of C-terminal truncation mutants retaining the PDZ domain blocked IGF-1-induced MAP kinase activation and oocyte maturation. Full-length xGIPC enhanced RGS-GAIP stimulation of insulin response in oocytes.\",\n      \"method\": \"Xenopus oocyte injection, yeast two-hybrid or binding assays, MAP kinase activation assay, maturation assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional loss-of-function in Xenopus oocytes with defined phenotype, single lab\",\n      \"pmids\": [\"11751850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"GIPC1 interacts with megalin (LRP2) in renal proximal tubule epithelial cells. GST-GIPC specifically binds megalin in precipitation assays. GIPC1, GAIP, and Galphai3 cosediment with megalin in brush border and microvillar fractions, and GIPC1 is localized in clathrin-coated pits and apical tubules of endocytic compartments.\",\n      \"method\": \"GST pull-down, cell fractionation, immunoelectron microscopy, immunofluorescence\",\n      \"journal\": \"Journal of the American Society of Nephrology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GST pull-down plus IEM and fractionation in single lab\",\n      \"pmids\": [\"11912251\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GIPC1 co-immunoprecipitates with the beta1-adrenergic receptor (beta1-AR) in COS-7 cells via an interaction requiring the Ser residue of the ESKV C-terminal motif. GIPC1 expression substantially decreases beta1-AR-stimulated, Gi-mediated ERK1/2 activation (inhibited by pertussis toxin) but has no effect on receptor sequestration or cAMP accumulation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, cAMP assay, ERK1/2 phosphorylation assay, pertussis toxin treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus functional assays with specific mutant controls, single lab\",\n      \"pmids\": [\"12724327\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GIPC1 PDZ domain interacts specifically with dopamine D2 and D3 receptors (but not D4 receptor) via their C-terminal sequences. GIPC1 co-internalizes with D2R and D3R, reduces D3R signaling, and sequesters receptors in sorting vesicles to prevent lysosomal degradation. GIPC1 dimerization is required for its scaffolding function.\",\n      \"method\": \"Yeast two-hybrid, pull-down, affinity chromatography with recombinant and endogenous proteins, immunofluorescence colocalization, internalization assays, signaling assays\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical and cell biological methods in single comprehensive study\",\n      \"pmids\": [\"14617818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"GIPC1 interacts with human lutropin receptor (hLHR) via its PDZ domain binding to the C-terminal tetrapeptide of hLHR. siRNA knockdown of GIPC1 reduces recycling of internalized hormone and lowers steady-state hLHR density at the cell surface.\",\n      \"method\": \"Yeast two-hybrid, pull-down, co-immunoprecipitation, siRNA knockdown, receptor trafficking assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid, co-IP, siRNA functional assay in single lab\",\n      \"pmids\": [\"14507927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"GIPC1 is required for recruitment of GAIP (RGS19) to the dopamine D2 receptor at the plasma membrane. D2R activation drives dynamic translocation of GAIP to the plasma membrane via GIPC1 scaffolding. The GTPase activity of GAIP regulates two D2R-mediated responses in a GIPC1-dependent manner, establishing GIPC1 as a required component of a GPCR-RGS signaling complex.\",\n      \"method\": \"Co-immunoprecipitation, membrane translocation assay, functional signaling assays, cell fractionation\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and functional signaling assays, single lab\",\n      \"pmids\": [\"15356268\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"GIPC1 contains two myosin VI binding domains in its C terminus, with separate N-terminal oligomerization and C-terminal myosin VI binding functions. The myosin VI binding domain is necessary for intracellular interactions with myosin VI and for recruitment of myosin VI to membrane structures. GIPC1/myosin VI complexes move in cellular extensions in an actin-dependent and microtubule-independent manner. Blocking either GIPC1-myosin VI or GLUT1-GIPC1 interactions disrupts GLUT1 trafficking in polarized epithelial cells, reducing plasma membrane GLUT1.\",\n      \"method\": \"Deletion mutant analysis, co-immunoprecipitation, live-cell imaging, pharmacological actin/microtubule inhibitors, GLUT1 trafficking assay in polarized cells\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — systematic mutant analysis with multiple orthogonal functional assays establishing mechanistic domain requirements\",\n      \"pmids\": [\"15975910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"HPV-18 E6 protein interacts with TIP-2/GIPC1 and triggers its polyubiquitination and proteasome-mediated degradation. This reduces GIPC1 levels in HeLa cells and impairs TGF-beta signaling (reduces Id3 induction and antiproliferative effect of TGF-beta). siRNA silencing of E6 restores GIPC1 levels and TGF-beta responsiveness.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, proteasome inhibitor experiments, reporter gene assay, cell proliferation assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, proteasome inhibitor validation, and siRNA rescue in single lab\",\n      \"pmids\": [\"15767424\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"GIPC1 (synectin) is required for internalization of cell surface receptors and for coupling of myosin VI to uncoated endocytic vesicles (UCV). The mechanism involves PDZ domain engagement by C termini of internalized receptors (e.g., megalin), which in trans facilitates myosin VI binding to the GIPC1 C terminus outside the PDZ domain. In GIPC1-null mice, megalin is mistargeted in renal proximal tubules causing proteinuria.\",\n      \"method\": \"siRNA knockdown, deletion mutant analysis, in vivo knockout mouse phenotype (proteinuria, megalin mislocalization), endocytic assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo null mouse phenotype plus mechanistic in trans recruitment model validated by deletion mutants\",\n      \"pmids\": [\"16908842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"APPL1 is identified as a TrkA-associated protein that binds to GIPC1 via its C-terminal sequence engaging the GIPC1 PDZ domain. APPL1, GIPC1, and phosphorylated TrkA co-enrich in the same endosomal fractions. Knockdown of either APPL1 or GIPC1 suppresses NGF-dependent MEK, ERK, and Akt activation and neurite outgrowth in PC12 cells.\",\n      \"method\": \"Mass spectrometry from rat brain lysate, co-immunoprecipitation in sympathetic neurons, high-resolution endosomal fractionation, siRNA knockdown with signaling and neurite outgrowth readouts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — mass spectrometry identification replicated by co-IP in neurons, endosomal fractionation, functional siRNA knockdown with multiple signaling readouts\",\n      \"pmids\": [\"17000777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Endogenous GIPC1 binds to the C terminus of APPL (a Rab5 effector) via its PDZ domain. Upon NGF/TrkA activation, GIPC1 and APPL translocate to peripheral endocytic vesicles carrying TrkA. GIPC1's interaction with APPL is essential for GIPC1 recruitment to peripheral endosomes; a GIPC1 PDZ mutant unable to bind APPL inhibits NGF-induced GIPC1 recruitment, MAPK activation, and neurite outgrowth. GIPC1 depletion slows endocytosis and trafficking of TrkA to EEA1 early endosomes.\",\n      \"method\": \"Co-immunoprecipitation, GIPC1 PDZ mutant overexpression, siRNA knockdown, immunofluorescence live tracking, MAPK phosphorylation assay, neurite outgrowth assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — PDZ mutant epistasis plus siRNA with multiple orthogonal functional readouts in single comprehensive study\",\n      \"pmids\": [\"17015470\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GIPC1 associates with surface and internalized NMDA receptors in heterologous cells and colocalizes with a population of NMDA receptors on the cell surface of neurons. GIPC1 is mainly excluded from synapses. Changes in GIPC1 expression alter the number of surface (extrasynaptic) NMDA receptors without changing total synaptic receptor numbers.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence in neurons, surface receptor quantification upon GIPC1 overexpression/knockdown\",\n      \"journal\": \"The Journal of neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP and loss/gain-of-function with surface receptor quantification, single lab\",\n      \"pmids\": [\"17959809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Endoglin interacts with GIPC1 via a Class I PDZ binding motif in the cytoplasmic domain of endoglin. GIPC1 promotes cell surface retention of endoglin in a TGF-beta-independent manner. Endoglin-GIPC1 interaction specifically enhances TGF-beta1-induced Smad 1/5/8 phosphorylation and a Smad 1/5/8 responsive promoter, and inhibits endothelial cell migration; all dependent on the endoglin-GIPC1 interaction.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence confocal microscopy, subcellular distribution studies, Smad phosphorylation assay, reporter assay, cell migration assay with PDZ-binding mutant constructs\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP, colocalization, and multiple functional assays with mutant rescue, single comprehensive study\",\n      \"pmids\": [\"18775991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Neuropilin-1 (Nrp1) promotes alpha5beta1 integrin-mediated endothelial cell adhesion to fibronectin via its cytoplasmic SEA motif by binding GIPC1. GIPC1 interacts with both Nrp1 and alpha5beta1 integrin and, together with myosin VI, stimulates internalization of active alpha5beta1 into Rab5-positive early endosomes. GIPC1 and Myo6 knockdown reduces active alpha5beta1 endocytosis and EC adhesion to fibronectin.\",\n      \"method\": \"RNA interference, rescue with wild-type and mutant constructs, co-immunoprecipitation, live-cell imaging with Rab5-positive endosome markers, adhesion assays\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — siRNA knockdown plus mutant rescue, co-IP, and live imaging with multiple orthogonal functional readouts\",\n      \"pmids\": [\"19175293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The cytoplasmic domain of TbetaRIII is essential for TbetaRIII-mediated attenuation of TGF-beta signaling and inhibition of breast cancer cell migration/invasion in vitro and tumor progression in vivo. The interaction between the TbetaRIII cytoplasmic domain and GIPC1 is mechanistically required for both TGF-beta signaling attenuation and invasion suppression.\",\n      \"method\": \"In vivo xenograft models, in vitro migration/invasion assays, TbetaRIII cytoplasmic domain deletion/mutant constructs, GIPC1 interaction assays\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo and in vitro functional assays with mutant constructs, single lab\",\n      \"pmids\": [\"19955393\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"GIPC1 PDZ domain interaction with IGF-1R is essential for post-translational stability and maintenance of IGF-1R protein levels in pancreatic adenocarcinoma cells. siRNA knockdown of GIPC1 reduces IGF-1R protein levels and decreases cell proliferation. A PDZ domain-targeting peptide (PSQSSSEA) inhibits GIPC1-IGF-1R association and reduces tumor growth in vivo.\",\n      \"method\": \"siRNA knockdown, PDZ peptide inhibition, IGF-1R protein level assay, orthotopic tumor mouse model with bioluminescence\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA and peptide inhibitor with in vitro and in vivo functional readouts, single lab\",\n      \"pmids\": [\"19509165\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GIPC1 PDZ domain binds to the PDZ-binding motif at the C terminus of MyoGEF (a guanine nucleotide exchange factor). GIPC1 and MyoGEF colocalize at the cell leading edge. RNAi depletion of GIPC1 in MDA-MB-231 cells shifts cells from polarized to rounded morphology and dramatically decreases Matrigel invasion. An anti-MyoGEF peptide antibody blocking GIPC1-MyoGEF complex formation similarly disrupts cell polarization and invasion.\",\n      \"method\": \"In vitro and in vivo binding assays, co-immunoprecipitation, immunofluorescence, RNAi knockdown, Matrigel invasion assay, antibody-mediated complex disruption\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro and in vivo binding assays, RNAi, and antibody disruption with consistent functional readouts\",\n      \"pmids\": [\"20634288\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TGFbetaR3 interaction with GIPC1 (via the 3 C-terminal amino acids of TGFbetaR3 required to bind GIPC1) is critical for epicardial cell invasion and proliferation in response to TGFbeta1, TGFbeta2, FGF2, and HMW-HA. Expression of TGFbetaR3 missing the PDZ-binding motif fails to rescue deficits in Tgfbr3-/- cells, while GIPC1 knockdown in wild-type cells decreases invasion.\",\n      \"method\": \"Mouse embryo epicardial cell cultures, TGFbetaR3 mutant rescue constructs, GIPC1 siRNA knockdown, invasion and proliferation assays\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic rescue with deletion mutant plus siRNA knockdown in primary cells, single lab\",\n      \"pmids\": [\"21871877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TGFbetaR3 interaction with GIPC1 is absolutely required for TGFbeta2- or BMP-2-stimulated endothelial-to-mesenchymal transformation (EMT) in atrioventricular endocardial cushion explants. TGFbetaR3 lacking the C-terminal GIPC1-binding residues or TGFbetaR3 without its entire cytoplasmic domain fails to support EMT. GIPC1 overexpression enhances EMT while GIPC1 siRNA silencing inhibits it.\",\n      \"method\": \"AVC explant EMT assay, mutant TGFbetaR3 constructs, GIPC1 overexpression and siRNA knockdown\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with mutant rescue in primary tissue explant system, single lab\",\n      \"pmids\": [\"21945156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Gipc1 interacts with Vangl2 (a core PCP protein), and a myosin VI-Gipc1 complex regulates Vangl2 trafficking in heterologous cells. In MyoVI mutant mouse cochlea, Vangl2 membrane presence is increased. Disruption of Gipc1 function in hair cells causes maturation defects including hair bundle orientation and integrity defects. STED microscopy shows enrichment of Vangl2 on the supporting cell side adjacent to proximal hair cell membrane.\",\n      \"method\": \"Co-immunoprecipitation, heterologous cell trafficking assay, MyoVI mutant mouse analysis, in vivo Gipc1 disruption, STED microscopy\",\n      \"journal\": \"Development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple methods including genetic mouse model, trafficking assay, and super-resolution microscopy\",\n      \"pmids\": [\"22991442\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GIPC1 directly binds the PDZ binding motif (SVV) of LPA1 receptor but not other LPA receptors. LPA1 colocalizes and coimmunoprecipitates with GIPC1 and APPL on APPL signaling endosomes. GIPC1 siRNA depletion disturbs LPA1 trafficking to EEA1 early endosomes and promotes LPA1-mediated Akt signaling, cell proliferation, and cell motility.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence colocalization, siRNA knockdown, Akt signaling assay, cell proliferation and motility assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, colocalization, siRNA with multiple functional readouts, single lab\",\n      \"pmids\": [\"23145131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structures reveal that GIPC1 forms a domain-swapped dimer in an autoinhibited conformation that blocks binding of both PlexinD1 and myosin VI. PlexinD1 binding to GIPC1 releases autoinhibition, enabling myosin VI interaction. GIPCs and myosin VI interact through two distinct interfaces and form an open-ended alternating oligomeric array that underlies GIPC/myosin VI complex oligomerization in solution and cells.\",\n      \"method\": \"Crystal structure determination (multiple structures in apo and bound states), solution binding assays, cell-based validation of oligomerization\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple crystal structures of apo and bound states with cell-based validation, single comprehensive structural study\",\n      \"pmids\": [\"28537552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"GIPC proteins negatively modulate PlexinD1 signaling during vascular development. Zebrafish expressing Plxnd1 with impaired GIPC binding show low-penetrance angiogenesis deficits and hypersensitivity to antiangiogenic drugs. gipc mutant zebrafish show angiogenic impairments ameliorated by reducing Plxnd1 signaling. GIPC depletion in cultured endothelial cells potentiates SEMA-PLXND1 signaling, establishing GIPC as a negative modulator of antiangiogenic PLXND1 signaling through endocytic trafficking.\",\n      \"method\": \"Zebrafish CRISPR/endogenous mutation, genetic epistasis (gipc mutant + plxnd1 reduction), GIPC depletion in endothelial cells with SEMA-PLXND1 signaling readout, antiangiogenic drug treatment\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo genetic epistasis in zebrafish plus in vitro signaling assays, multiple orthogonal approaches\",\n      \"pmids\": [\"31050647\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"GIPC1 upregulates IGFBP-3 expression downstream of TGF-beta in hepatic stellate cells via epigenetic mechanisms: GIPC1 increases H3K27 acetylation and decreases H3K27me3 at the IGFBP-3 locus. IGFBP-3 promotes HSC migration through integrin-dependent phosphorylation of Akt. Global IGFBP-3 knockout mice show attenuation of HSC activation and portal pressure in chronic liver injury.\",\n      \"method\": \"mRNA sequencing, qPCR, ELISA, chromatin immunoprecipitation (ChIP), Western blot, siRNA knockdown, in vivo knockout mouse model, Akt phosphorylation assay\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP epigenetic analysis plus in vivo knockout, single lab, multiple methods\",\n      \"pmids\": [\"32447051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GIPC1 mediates actin-based retrograde transport of Drp1 (a mitochondrial fission GTPase) toward perinuclear mitochondria. Drp1 interacts with GIPC1 through an atypical C-terminal PDZ-binding motif. Loss of this interaction causes Drp1 cytoplasmic mislocalization and reduced mitochondrial fission despite normal GTPase activity. GIPC1 potentiates Drp1-driven cancer cell proliferation and migration.\",\n      \"method\": \"Proteomic interactome screening, co-immunoprecipitation, live-cell imaging (retrograde transport tracking), mitochondrial fission assay, cell proliferation and migration assays with GIPC1 loss-of-function\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, live imaging, and loss-of-function functional assays, single lab\",\n      \"pmids\": [\"34705526\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"GIPC1 interacts with SR-B1 (scavenger receptor class B type 1) and stabilizes it by negatively regulating its proteasomal and lysosomal degradation. Co-immunoprecipitation with wild-type and mutant GIPC1 in overexpressing cells, native liver cells, and mouse liver tissues confirms the interaction. GIPC1 overexpression increases SR-B1 protein levels and HDL-cholesterol/CE uptake; GIPC1 silencing in mouse liver reduces SR-B1 levels and elevates plasma TG/TC.\",\n      \"method\": \"Co-immunoprecipitation (wild-type and mutant constructs, native cells, mouse tissues), siRNA knockdown in vivo, overexpression assay, cholesterol uptake assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP validated in multiple systems plus in vivo siRNA with metabolic readouts, single lab\",\n      \"pmids\": [\"33811857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The GIPC myosin-interacting region (MIR) releases an autoinhibitory interaction within myosin VI, causing conformational changes including increased lever arm flexibility and increased flexibility of the adaptor-motor linkage. This increases actomyosin association/dissociation rates and stimulates a 2-3 fold increase in ensemble cargo transport speed, while GIPC MIR-myosin VI ensembles yield run lengths similar to forced processive dimers.\",\n      \"method\": \"Motility assays, FRET-based conformational sensors, optical trapping, DNA origami-based cargo scaffolds\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstituted in vitro biophysical assays with multiple orthogonal methods including FRET and optical trapping, defining molecular mechanism\",\n      \"pmids\": [\"35143838\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"GIPC1 interacts directly with IGF1R and participates in Akt1 activation. In mouse embryonic stem cells, dominant-negative GIPC1 overexpression or GIPC1 knockdown inhibits eye field cell development. Pharmacological inhibition of Akt1 phosphorylation mimics the dominant-negative GIPC1 phenotype, supporting a GIPC1-PI3K-Akt1 pathway in eye field specification.\",\n      \"method\": \"Dominant-negative construct overexpression, siRNA knockdown, co-immunoprecipitation (GIPC1-IGFR), Akt1 inhibitor treatment, directed differentiation assay from mESCs\",\n      \"journal\": \"Stem cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus loss-of-function and pharmacological rescue in stem cell differentiation model, single lab\",\n      \"pmids\": [\"26013465\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Drd3 palmitoylation acts as a molecular switch for GIPC1-dependent biased signaling. De-palmitoylation enables Helix-8 of Drd3 to move out into aqueous environment for interaction with GIPC1 PDZ domain. Biochemical studies, live imaging, and mutant protein analysis show that palmitoylation regulates Drd3-GIPC1 interaction and affects receptor trafficking and signaling.\",\n      \"method\": \"Molecular dynamics simulations, biochemical interaction assays, live-cell imaging, palmitoylation mutant analysis\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — computational modeling supported by biochemical and cell imaging data, single lab\",\n      \"pmids\": [\"26787837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GIPC1 interacts with the beta1-adrenergic receptor and stabilizes its expression by preventing ubiquitination and degradation. Cardiomyocyte-specific GIPC1 knockout mice develop spontaneous cardiac hypertrophy, fibrosis, and systolic dysfunction. AAV9-mediated GIPC1 overexpression attenuates isoproterenol-induced pathological cardiac remodeling. GIPC1 maintains the balance of beta1-AR/beta2-AR and inhibits hyperactivation of MAPK signaling.\",\n      \"method\": \"Conditional knockout mice (Myh6-cre), AAV9 overexpression, echocardiography, histology, co-immunoprecipitation, ubiquitination assay, MAPK signaling analysis\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout and AAV rescue in vivo with multiple orthogonal readouts plus mechanistic co-IP and ubiquitination assays\",\n      \"pmids\": [\"38458410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"GIPC1 functions both as a protein binding partner of MACC1 (identified by yeast two-hybrid, mass spectrometry, co-IP, and peptide array) and as a transcription factor binding to the MACC1 promoter (TSS to -60 bp, confirmed by chromatin IP and EMSA). GIPC1 knockdown reduces endogenous MACC1 expression, diminishes MACC1-induced cell migration and invasion, and reduces tumor growth and metastasis in vivo.\",\n      \"method\": \"Yeast two-hybrid, mass spectrometry, co-immunoprecipitation, peptide array, chromatin immunoprecipitation, EMSA, siRNA knockdown, in vivo metastasis model\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods identifying dual protein/transcription factor function, single lab\",\n      \"pmids\": [\"38144523\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"GIPC1 interacts with mitochondrial DECR1 (2,4-dienoyl-CoA reductase) via its PDZ domain (co-IP/MS, molecular docking, surface plasmon resonance showing KD=16.3 nM). GIPC1 facilitates actin-dependent transport of DECR1 into mitochondria, maintaining redox homeostasis and suppressing ferroptosis. Cardiac-specific GIPC1 knockout disrupts mitochondrial fatty acid metabolism, increases PUFA-containing phospholipids, and promotes ferroptosis. DECR1 overexpression rescues GIPC1 ablation-induced ferroptosis.\",\n      \"method\": \"Co-IP/mass spectrometry, molecular docking, surface plasmon resonance, co-immunoprecipitation, immunofluorescence, cardiac-specific knockout mouse, proteomic and lipidomic analysis, rescue experiments\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — SPR binding constants, co-IP/MS, in vivo knockout with omics, and genetic rescue with DECR1 overexpression\",\n      \"pmids\": [\"41787053\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Interaction of hepatitis B virus core protein (HBc) with human GIPC1 was demonstrated via yeast two-hybrid screening of a human liver cDNA library. The PDZ domain of GIPC1 is sufficient for interaction with HBc, and the putative C-terminal PDZ-interacting motif of HBc is important for this interaction.\",\n      \"method\": \"Yeast two-hybrid screening, deletion analysis of PDZ domain\",\n      \"journal\": \"Archives of virology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single yeast two-hybrid method, no in-cell or in vitro validation, single lab\",\n      \"pmids\": [\"20091192\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"In human primary melanocytes, GIPC1 interacts with APPL (adaptor protein with PH domain) which co-precipitates with newly synthesized TRP1. APPL exists in a complex with GIPC1 and phospho-AKT. PI3-kinase inhibition abolishes GIPC1-APPL interaction and retards TRP1 in the Golgi. Knockdown of either GIPC1 or APPL inhibits melanogenesis by decreasing tyrosinase protein levels and activity.\",\n      \"method\": \"Co-immunoprecipitation, PI3K inhibitor treatment, siRNA knockdown, tyrosinase activity assay, immunofluorescence\",\n      \"journal\": \"Archives of biochemistry and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, pharmacological inhibition, and siRNA with functional readouts in primary melanocytes, single lab\",\n      \"pmids\": [\"21291857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"CD93 cytoplasmic tail binds to GIPC1 PDZ domain via a newly identified Class I PDZ-binding domain at the CD93 C terminus. Four positively charged juxtamembrane residues of CD93 stabilize this interaction. A cell-permeable peptide encoding the C-terminal 11 amino acids of CD93 enhances phagocytosis in human monocytes.\",\n      \"method\": \"Yeast two-hybrid, GST fusion protein pull-down assay, cell-permeable peptide treatment, phagocytosis assay\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid plus GST pull-down with functional peptide assay, single lab\",\n      \"pmids\": [\"15459234\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"VEGF-A/NRP1 signaling induces co-immunoprecipitable interactions between NRP1 and GIPC1, and complex formation between GIPC1 and Syx (a RhoGEF). GIPC1 or Syx knockdown reduces active RhoA and cell proliferation. Constitutively active RhoA restores proliferation in siVEGF-A cells, and GIPC1/Syx complex disruption by a cell-penetrating peptide inhibits RhoA activation and proliferation.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, RhoA activity assay, constitutively active RhoA rescue, cell-penetrating peptide disruption, proliferation assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP, genetic knockdown, and rescue with constitutively active RhoA, single lab\",\n      \"pmids\": [\"26209534\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GIPC1 is a PDZ domain-containing scaffolding/adaptor protein that uses its PDZ domain to bind the C-terminal PDZ-binding motifs of diverse transmembrane receptors (TrkA, TGFbetaRIII, NRP1, IGF1R, GLUT1, integrins, GPCRs including dopamine D2/D3 and beta1-AR, megalin, LPA1, SR-B1, and others) and cytoplasmic proteins (GAIP/RGS19, APPL1, MyoGEF, Drp1, DECR1), and its C-terminal GH2 domain recruits myosin VI; GIPC1 exists in an autoinhibited domain-swapped dimer that is activated by cargo binding to promote myosin VI-dependent endocytic trafficking and recycling of cargo receptors, while also scaffolding RGS proteins to GPCRs for signal attenuation, assembling signaling endosomes (with APPL1 and RTKs) for PI3K-Akt activation, facilitating Drp1 retrograde transport for mitochondrial fission, and regulating the stability of cell-surface receptors including beta1-AR and SR-B1 by preventing their ubiquitin-mediated degradation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GIPC1 is a cytosolic PDZ-domain scaffolding/adaptor protein that couples the cytoplasmic C-termini of diverse transmembrane receptors to the actin-based motor myosin VI, thereby controlling receptor endocytosis, trafficking, recycling, and signaling output [#0, #12, #14]. Through its single PDZ domain it engages defined C-terminal PDZ-binding motifs on a broad array of partners—the RGS protein GAIP/RGS19 [#0], GLUT1 [#1], TrkA [#2], TGF-beta receptors TbetaRIII and endoglin [#3, #18], integrin alpha-subunits [#4], dopamine D2/D3 receptors [#9], beta1-adrenergic receptor [#8], megalin [#7], neuropilin-1 and PlexinD1 [#19, #27], and LPA1 [#26]—while its C-terminal myosin-interacting region recruits myosin VI [#12]. Crystallographic and biophysical work shows GIPC1 forms an autoinhibited domain-swapped dimer; cargo binding to the PDZ domain releases autoinhibition to permit myosin VI engagement and assembly of an alternating GIPC1/myosin VI oligomeric array, and the GIPC1 myosin-interacting region relieves myosin VI autoinhibition to accelerate ensemble cargo transport [#27, #32]. Receptor C-termini bound in the PDZ pocket act in trans to license myosin VI recruitment and couple internalized cargo to uncoated endocytic vesicles, a function required in vivo for correct megalin targeting in renal proximal tubules [#14]. On this trafficking platform GIPC1 assembles APPL1-containing signaling endosomes that sustain TrkA- and LPA1-driven MEK/ERK and PI3K-Akt signaling and neurite outgrowth [#15, #16, #26], scaffolds GAIP/RGS19 to GPCRs to attenuate Gi-mediated signaling [#11, #8], and stabilizes cell-surface receptors including beta1-AR and SR-B1 by preventing their ubiquitin- and proteasome/lysosome-mediated degradation [#35, #31]. Beyond plasma-membrane cargo, GIPC1 mediates actin-dependent retrograde transport of the fission GTPase Drp1 to promote mitochondrial fission [#30] and of DECR1 into mitochondria to maintain redox homeostasis and suppress ferroptosis [#37]. Through these activities GIPC1 functions in TGF-beta-dependent EMT and epicardial/endocardial development [#23, #24], PCP-regulated cochlear hair-cell maturation via Vangl2 trafficking [#25], PlexinD1-dependent angiogenesis [#28], and cardiac homeostasis, where cardiomyocyte-specific loss causes spontaneous hypertrophy and dysfunction [#35].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established GIPC1 as a PDZ-domain protein with a specific binding partner, defining its founding identity as a selective scaffold rather than a generic adaptor.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down, deletion analysis and immunoelectron microscopy identifying the GAIP/RGS19 SEA-motif interaction and partitioning between cytosolic and vesicle-associated pools\",\n      \"pmids\": [\"9770488\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish what cargo the membrane-associated vesicle pool carries\", \"No functional consequence for GAIP-mediated GTPase signaling demonstrated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Showed GIPC1 binds receptor and cytoskeletal/motor partners isoform-specifically, framing it as an adapter that links transmembrane cargo to the cytoskeleton and myosin VI.\",\n      \"evidence\": \"Yeast two-hybrid, GST pull-down and co-IP with native GLUT1, plus interactions with myosin VI, alpha-actinin-1 and KIF-1B\",\n      \"pmids\": [\"10198040\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the domain architecture for motor binding versus cargo binding\", \"No direct transport or trafficking assay\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined GIPC1 as a multi-receptor PDZ adaptor that regulates receptor surface stability and signaling output across RTKs, TGF-beta receptors, integrins and biosynthetic cargo.\",\n      \"evidence\": \"Co-IP, expression cloning, peptide binding, cell-surface and reporter assays for TrkA, TbetaRIII, integrin alpha-subunits and gp75/TYRP1\",\n      \"pmids\": [\"11251075\", \"11546783\", \"11479315\", \"11852236\", \"11441007\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking PDZ binding to altered surface stability not resolved\", \"Whether a single GIPC1 molecule services all cargos or distinct pools dedicated to each\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated GIPC1 controls GPCR fate and signaling, sequestering internalized dopamine receptors from lysosomal degradation and attenuating Gi-coupled ERK signaling, with dimerization required for scaffolding.\",\n      \"evidence\": \"Yeast two-hybrid, pull-down, internalization and signaling assays for D2/D3 receptors and beta1-AR with mutant and pertussis-toxin controls\",\n      \"pmids\": [\"14617818\", \"12724327\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the required dimerization not yet defined\", \"How GIPC1 selects between recycling and anti-degradative routing unclear\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Positioned GIPC1 as an obligatory component of a GPCR-RGS signaling module, showing it recruits GAIP/RGS19 to an active receptor at the membrane.\",\n      \"evidence\": \"Co-IP, agonist-driven membrane translocation, and GAIP GTPase-dependent functional signaling assays at the dopamine D2 receptor\",\n      \"pmids\": [\"15356268\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab; reciprocal validation of the translocation mechanism limited\", \"Generality across other Gi-coupled receptors not tested here\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Resolved GIPC1 domain logic—separable N-terminal oligomerization and C-terminal myosin VI binding—and showed actin-dependent, microtubule-independent motility of GIPC1/myosin VI complexes is required for cargo (GLUT1) trafficking.\",\n      \"evidence\": \"Deletion mutant mapping, co-IP, live-cell imaging with cytoskeletal inhibitors, and GLUT1 trafficking assays in polarized epithelia\",\n      \"pmids\": [\"15975910\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cargo binding gates motor recruitment not yet structurally explained\", \"Directionality and processivity of transport not directly measured\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Established the in trans recruitment model and in vivo necessity: receptor PDZ engagement licenses myosin VI binding to couple cargo to uncoated endocytic vesicles, with megalin mistargeting causing proteinuria in GIPC1-null mice.\",\n      \"evidence\": \"siRNA, deletion analysis, endocytic assays and GIPC1-null mouse renal phenotype; plus identification of APPL1 endosomal signaling complex with TrkA\",\n      \"pmids\": [\"16908842\", \"17000777\", \"17015470\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the trans-recruitment is regulated to prevent constitutive motor engagement\", \"Whether APPL endosome assembly is mechanistically separable from myosin VI transport\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended GIPC1's receptor-stabilizing role to TGF-beta superfamily co-receptors and linked it to pathway-selective Smad signaling and cell migration control.\",\n      \"evidence\": \"Reciprocal co-IP, colocalization, Smad1/5/8 phosphorylation, reporter and migration assays with endoglin PDZ-motif mutants\",\n      \"pmids\": [\"18775991\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which GIPC1 biases TGF-beta toward Smad1/5/8 not defined\", \"Trafficking step responsible for surface retention not pinpointed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Connected GIPC1/myosin VI-driven integrin endocytosis to neuropilin-1-promoted adhesion and migration, and tied GIPC1-receptor binding to cancer-relevant signaling, invasion suppression and IGF1R protein stability.\",\n      \"evidence\": \"siRNA with mutant rescue, co-IP, Rab5 endosome live imaging and adhesion assays (NRP1/alpha5beta1); in vivo xenograft and tumor-growth models for TbetaRIII and IGF1R\",\n      \"pmids\": [\"19175293\", \"19955393\", \"19509165\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether IGF1R stabilization is a direct trafficking effect or indirect\", \"Reconciliation of pro-adhesion versus invasion-suppressive roles across cell types\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Broadened GIPC1's developmental reach—PCP protein Vangl2 trafficking in cochlear hair cells and LPA1 endosomal sorting that restrains Akt-driven proliferation/motility.\",\n      \"evidence\": \"Co-IP, heterologous trafficking assays, MyoVI mutant mouse and STED microscopy (Vangl2); co-IP, colocalization and siRNA with signaling readouts (LPA1)\",\n      \"pmids\": [\"22991442\", \"23145131\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How GIPC1/myosin VI directs asymmetric Vangl2 localization not fully resolved\", \"Whether LPA1 sorting outcome generalizes to other GPCRs\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural mechanism for autoinhibition and cargo-triggered activation, showing GIPC1 is a domain-swapped dimer whose PlexinD1 binding releases inhibition to permit myosin VI engagement and oligomeric array formation.\",\n      \"evidence\": \"Multiple apo and bound crystal structures with solution binding and cell-based oligomerization validation\",\n      \"pmids\": [\"28537552\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether all cargos relieve autoinhibition identically\", \"Stoichiometry of the transport-competent array in vivo not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined GIPC1 as an in vivo negative modulator of antiangiogenic PlexinD1 signaling, acting through endocytic trafficking during vascular development.\",\n      \"evidence\": \"Zebrafish genetic epistasis between gipc and plxnd1 mutants plus endothelial-cell SEMA-PLXND1 signaling assays\",\n      \"pmids\": [\"31050647\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking step that limits PlexinD1 signaling not pinpointed\", \"Relationship to angiogenic versus other GIPC1 cargos in endothelium\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed GIPC1 mediates actin-based retrograde transport of the mitochondrial fission GTPase Drp1 and stabilizes the lipoprotein receptor SR-B1 against degradation, extending its role to organelle dynamics and lipid metabolism.\",\n      \"evidence\": \"Interactome screening, co-IP, retrograde-transport live imaging and fission assays (Drp1); co-IP in multiple systems and in vivo siRNA with cholesterol-uptake readouts (SR-B1)\",\n      \"pmids\": [\"34705526\", \"33811857\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab findings without reciprocal cross-validation\", \"How GIPC1 distinguishes anti-degradative from transport functions for different cargos\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the biophysical mechanism of GIPC1-driven transport, showing its myosin-interacting region relieves myosin VI autoinhibition and accelerates ensemble cargo movement.\",\n      \"evidence\": \"Reconstituted motility assays, FRET conformational sensors, optical trapping and DNA-origami cargo scaffolds\",\n      \"pmids\": [\"35143838\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo confirmation of the predicted speed increase on native cargo\", \"How cargo identity modulates ensemble size and run length\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated a physiological cardiac role: GIPC1 stabilizes beta1-AR against ubiquitin-mediated degradation and restrains MAPK hyperactivation, with cardiomyocyte loss causing spontaneous hypertrophy and dysfunction rescued by overexpression.\",\n      \"evidence\": \"Conditional knockout and AAV9-rescue mice with echocardiography, histology, co-IP, ubiquitination and MAPK signaling analyses\",\n      \"pmids\": [\"38458410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether anti-ubiquitination is direct or via trafficking\", \"Contribution of beta1/beta2-AR balance versus other GIPC1 cargos to the cardiac phenotype\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Identified a mitochondrial protective function: GIPC1 binds and delivers DECR1 into mitochondria via actin-dependent transport to maintain redox homeostasis and suppress ferroptosis, with cardiac knockout disrupting fatty-acid metabolism.\",\n      \"evidence\": \"Co-IP/MS, SPR (KD=16.3 nM), docking, cardiac-specific knockout with proteomics/lipidomics and DECR1-overexpression rescue\",\n      \"pmids\": [\"41787053\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mitochondrial import handoff after actin transport not defined\", \"Relationship to the Drp1 transport role in the same compartment\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How GIPC1 selects among its dozens of competing PDZ cargos and switches between recycling, anti-degradative stabilization, and retrograde organelle transport in a single cell remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No quantitative model of cargo competition for the single PDZ pocket\", \"Regulatory inputs that select trafficking versus stabilization outcomes unknown\", \"Reported transcription-factor function at the MACC1 promoter not reconciled with the cytoplasmic scaffold role\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 12, 14, 27]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [1, 12, 32]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [8, 11, 28, 35]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 7, 14, 16]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [16, 19, 26]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [5, 39]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [11, 17]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [30, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [12, 14, 16, 19]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 8, 18, 28]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [25, 30, 37]}\n    ],\n    \"complexes\": [\n      \"GIPC1/myosin VI transport complex\",\n      \"GIPC1/APPL1 signaling endosome\"\n    ],\n    \"partners\": [\n      \"MYO6\",\n      \"RGS19\",\n      \"APPL1\",\n      \"NRP1\",\n      \"TGFBR3\",\n      \"DRD3\",\n      \"ADRB1\",\n      \"DRP1\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"faith_supported":7,"faith_total":7,"faith_pct":100.0}}