{"gene":"GRB7","run_date":"2026-04-28T18:06:53","timeline":{"discoveries":[{"year":1994,"finding":"GRB7 binds tightly to HER2/ErbB2 through its SH2 domain in breast cancer cells; a large fraction of tyrosine-phosphorylated HER2 in SKBR-3 cells is bound to GRB7. GRB7 can also bind tyrosine-phosphorylated SHC.","method":"Expression cloning using phosphorylated EGFR C-terminus as probe; co-immunoprecipitation from cell lysates","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, foundational discovery replicated by multiple subsequent labs","pmids":["7907978"],"is_preprint":false},{"year":1996,"finding":"GRB7 SH2 domain directly binds to autophosphorylated PDGF beta-receptor at Tyr-716 and Tyr-775 in vitro and in vivo; GRB7 also associates with Shc after PDGF alpha- or beta-receptor activation.","method":"GST pulldown with autophosphorylated PDGF receptor; site-directed mutagenesis of receptor tyrosines; co-immunoprecipitation; phosphopeptide competition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro binding assay with mutagenesis plus in vivo co-IP","pmids":["8940081"],"is_preprint":false},{"year":1996,"finding":"GRB7 SH2 domain directly associates with the Ret receptor tyrosine kinase in vitro and in vivo in an autophosphorylation-dependent manner; a kinase-defective Ret mutant cannot bind GRB7.","method":"In vitro binding assay; co-immunoprecipitation; kinase-dead Ret mutant","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct binding demonstrated with kinase-dead mutant control","pmids":["8631863"],"is_preprint":false},{"year":1996,"finding":"GRB7 SH2 domain interacts with tyrosine-phosphorylated SHPTP2 at Tyr-580 in the C-terminal tail of SHPTP2, as detected by modified two-hybrid system and confirmed by in vitro binding under phosphorylation conditions.","method":"Yeast two-hybrid with exogenous tyrosine kinase; in vitro binding assay; deletion/mutation mapping","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — two-hybrid plus in vitro binding, single lab","pmids":["8622870"],"is_preprint":false},{"year":1997,"finding":"The Grb7 SH2 domain binds preferentially to Tyr-1139 of ErbB2; a single residue at position betaD6 (Leu in Grb7 vs. Gln in Grb14) is a key determinant of high-affinity ErbB2 binding specificity within the Grb7 family.","method":"Phosphopeptide competition; site-directed mutagenesis of SH2 domain; in vitro binding assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis plus in vitro binding with phosphopeptide competition","pmids":["9079677"],"is_preprint":false},{"year":1998,"finding":"Grb7 is recruited by heregulin-activated ErbB3 and ErbB4 via its SH2 domain; Tyr-1180 (major) and Tyr-1243 (minor) of ErbB3 are the binding sites; Arg at position +3 relative to the phosphotyrosine acts as a selectivity determinant favoring Grb7 over Grb2.","method":"Co-immunoprecipitation from breast cancer cell lines; ErbB3 point mutants; phosphopeptide competition; GST pulldown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — site-directed mutagenesis plus phosphopeptide competition and pulldown, multiple orthogonal methods","pmids":["9516479"],"is_preprint":false},{"year":1999,"finding":"The Grb7 SH2 domain directly interacts with FAK at its major autophosphorylation site Tyr-397 in vitro and in vivo; this interaction is cell adhesion-dependent (integrin signaling context); overexpression of Grb7 enhances cell migration toward fibronectin whereas its SH2 domain alone inhibits migration.","method":"In vitro binding assay; co-immunoprecipitation; tetracycline-regulated expression; Boyden chamber migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — direct in vitro binding with defined site, clean gain/loss-of-function migration assay, replicated","pmids":["10446223"],"is_preprint":false},{"year":1999,"finding":"Grb7 binds to c-Kit/stem cell factor receptor (SCFR) at autophosphorylated Tyr-936 in the C-terminal tail via its SH2 domain; Grb2 binds both Tyr-703 and Tyr-936, whereas Grb7 binding is selective for Tyr-936.","method":"In vivo autophosphorylation mapping; SH2 domain binding experiments; site-directed mutagenesis of c-Kit","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis plus selective binding assays demonstrating site specificity","pmids":["10377264"],"is_preprint":false},{"year":1999,"finding":"Sequence analysis identified a Ras-associating (RA)-like domain in the N-terminal region of Grb7/Grb10/Grb14 family proteins, suggesting direct interaction potential with Ras-like GTPases.","method":"Computational sequence analysis (BLAST, HCA, HMM profiling) with structural comparison","journal":"Biochemical and biophysical research communications","confidence":"Low","confidence_rationale":"Tier 4 — computational prediction only","pmids":["10334925"],"is_preprint":false},{"year":2000,"finding":"Grb7 localizes partially to focal contacts via its SH2 domain; SH2 domain deletion eliminates focal contact localization and abolishes Grb7-stimulated cell migration; FAK phosphorylates Grb7 in a kinase-activity-dependent and cell-adhesion-dependent manner, and Grb7 is a physiological substrate of FAK (phosphorylation reduced in FAK-/- cells).","method":"Deletion mutants and chimeric molecules; focal contacts localization by microscopy; FAK-/- fibroblasts; tetracycline-regulated expression; migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — genetic rescue experiment with chimeric molecules, FAK knockout cells, clean mechanistic dissection","pmids":["10893408"],"is_preprint":false},{"year":2000,"finding":"Tyrosine-phosphorylated caveolin-1 (at Tyr-14, phosphorylated by c-Src) binds to Grb7 via its SH2 domain both in vitro and in vivo; this interaction augments anchorage-independent growth and EGF-stimulated cell migration.","method":"In vitro GST pulldown; co-immunoprecipitation; monoclonal antibody specific for pTyr-14 caveolin-1; functional migration and growth assays","journal":"Molecular endocrinology","confidence":"High","confidence_rationale":"Tier 2 — in vitro binding confirmed in vivo with functional consequences, multiple methods","pmids":["11075810"],"is_preprint":false},{"year":2000,"finding":"Grb7 interacts with the Rho family GTPase Rnd1 (constitutively GTP-bound); the interaction involves the switch II loop of Rnd1 and the SH2 domain of Grb7; confirmed by two-hybrid, in vitro binding, and pulldown from SKBR3 cells.","method":"Yeast two-hybrid; in vitro binding; GST pulldown from breast cancer cell line","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, three methods but no functional consequences determined","pmids":["10664463"],"is_preprint":false},{"year":2000,"finding":"Grb7 binds activated insulin receptors (via both SH2 domain and PIR/phosphotyrosine-interacting region) but is not a substrate of the insulin receptor tyrosine kinase; it preferentially associates with the insulin receptor over EGFR, FGF receptor, and Ret.","method":"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; domain deletion analysis","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — multiple methods, single lab, specificity shown vs. other receptors","pmids":["10803466"],"is_preprint":false},{"year":2001,"finding":"Targeting Grb7 (as Grb7-FAT chimera) to focal contacts stimulates cell migration but not cell cycle progression; distinct FAK signaling complexes regulate cell migration (Grb7) vs. cell cycle progression (Grb2).","method":"Chimeric fusion proteins (FAT sequence fused to signaling molecules); cell migration assay; cell cycle analysis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — clean epistasis experiment with chimeric molecules separating migration from proliferation","pmids":["11418135"],"is_preprint":false},{"year":2002,"finding":"The SH2 domain of Grb7 interacts with EphB1 receptor at Tyr-928 (primary site); EphB1 autophosphorylation is required for the interaction; EphB1 phosphorylates Grb7; co-expression of Grb7 with EphB1 enhances fibroblast motility while the Grb7 SH2 domain alone inhibits EphB1-stimulated migration.","method":"Yeast two-hybrid; co-immunoprecipitation; site-directed mutagenesis of EphB1; cell motility assay; EphB1 ligand (ephrinB1) stimulation","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — yeast two-hybrid confirmed by Co-IP, site mapping by mutagenesis, functional migration assay","pmids":["12223469"],"is_preprint":false},{"year":2002,"finding":"The Grb7 PH domain binds phosphoinositides (with preference for D3- and D5-phosphoinositides) both in vitro and in intact cells; PH domain-phosphoinositide interaction is required for FAK-mediated phosphorylation of Grb7 (though not for Grb7-FAK interaction or focal contact recruitment) and contributes to Grb7-stimulated cell migration; PI 3-kinase activity regulates this interaction.","method":"Lipid-binding assay in vitro; intact cell phosphoinositide binding; deletion mutants; PI3K inhibitor; FAK-/- cells; migration assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including in vitro lipid binding, genetic knockout, specific inhibitors, and functional readout","pmids":["12021278"],"is_preprint":false},{"year":2002,"finding":"Novel non-phosphorylated peptides with a YXN motif bind selectively to the Grb7 SH2 domain (not Grb2 or Grb14 SH2); the cyclic structure is required for binding; the peptide G7-18 inhibits Grb7 association with ErbB family RTKs (particularly ErbB3) in cell lysates in a dose-dependent manner.","method":"Phage display random peptide libraries; competition binding assays; cell lysate immunoprecipitation inhibition","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — phage display with confirmed binding specificity and functional inhibition of endogenous protein interactions","pmids":["11809769"],"is_preprint":false},{"year":2003,"finding":"Solution NMR structure of the human Grb7 SH2 domain in complex with the ErbB2 pY1139 phosphopeptide; the erbB2 peptide binds in a beta-turn conformation; structural basis for recognition specificity characterized.","method":"NMR spectroscopy; solution structure determination","journal":"Journal of biomolecular NMR","confidence":"High","confidence_rationale":"Tier 1 — NMR structure with natural ligand peptide","pmids":["12975581"],"is_preprint":false},{"year":2003,"finding":"Grb7 binds to the immunoglobulin superfamily receptor G6f via the Grb7 SH2 domain in a phosphorylation-dependent manner (pY281 of G6f); antibody cross-linking of G6f activates MAP kinase signaling.","method":"GST pulldown; immunoprecipitation; MAP kinase activation assay with MEK inhibitors","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2 — pulldown confirmed by Co-IP, functional downstream signaling shown","pmids":["12852788"],"is_preprint":false},{"year":2003,"finding":"Grb7 (but not Grb10) inhibits FGF receptor-induced maturation in Xenopus oocytes; this correlates with Grb7 binding to the receptor and inhibition of the Ras-dependent pathway; PIR and SH2 domains of Grb7 are differentially involved in FGFR signaling inhibition.","method":"Xenopus oocyte maturation assay; injection of Grb7 protein; domain deletion analysis","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — functional epistasis in Xenopus oocyte system with domain dissection","pmids":["12885405"],"is_preprint":false},{"year":2005,"finding":"Grb7 and its variant GRB7V are calmodulin (CaM)-binding proteins; the CaM-binding domain maps to an amphiphilic helix at residues 243-256 in the proximal PH domain region; CaM competes with phosphoinositide binding to Grb7; CaM regulates intracellular mobilization of Grb7 and its membrane association; ErbB2 activation by heregulin decreases membrane-associated Grb7 in a CaM-dependent manner.","method":"CaM-affinity chromatography; biotinylated CaM overlay; deletion mutants; phosphoinositide competition; cell-permeable CaM inhibitory peptides; FRET between EYFP-Grb7 and ECFP-CaM in living cells","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal methods including FRET in live cells, CaM affinity, domain mapping, and functional consequence","pmids":["15806159"],"is_preprint":false},{"year":2007,"finding":"Grb7 is an RNA-binding protein that serves as a molecular adaptor linking Netrin-1/FAK signaling to translational regulation; Grb7 binds the first stem loop of kappa opioid receptor (KOR) mRNA 5'-UTR and blocks eIF4E recruitment, repressing translation; FAK-mediated hyperphosphorylation of two C-terminal tyrosines of Grb7 reduces its RNA-binding and translation-repressive activity.","method":"RNA-binding assay; in vitro translation assay; FAK phosphorylation assay; co-immunoprecipitation; domain deletion and mutagenesis","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 — reconstituted RNA binding and translation repression in vitro, mechanistic link to FAK phosphorylation established","pmids":["17318180"],"is_preprint":false},{"year":2007,"finding":"Crystal structure of the Grb7 SH2 domain solved to 2.1 Å resolution; the SH2 domain dimerizes with KD in the μM range (both for full-length Grb7 and SH2 domain alone); G7-18NATE cyclic peptide binds Grb7-SH2 with KD ~35.7 μM and disrupts both the ligand-binding surface and the dimer interface.","method":"X-ray crystallography (2.1 Å); analytical ultracentrifugation; ITC; NMR spectroscopy titration","journal":"BMC structural biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with multiple orthogonal biophysical validation methods","pmids":["17894853"],"is_preprint":false},{"year":2008,"finding":"Grb7 is an integral component of stress granules (SGs) and directly interacts with HuR; Grb7 is required for SG formation in response to stress; upon stress termination, FAK hyperphosphorylates Grb7, causing loss of HuR interaction and Grb7 dissociation from SG components, thereby driving SG disassembly; dominant-negative hypophospho-mutants of FAK and Grb7 attenuate SG disassembly.","method":"Co-immunoprecipitation; stress granule immunofluorescence; dominant-negative mutants; FAK kinase assay; siRNA knockdown","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 — reciprocal Co-IP, dominant-negative mutants, and siRNA with clear cellular phenotype, replicated within study","pmids":["18273060"],"is_preprint":false},{"year":2009,"finding":"Grb7 interacts with the transcriptional regulator FHL2 via its RA and PH domains (not the SH2 domain); this interaction occurs in mammalian cells and requires Grb7 to be tyrosine phosphorylated; NMR evidence supports a model of Grb7 autoinhibition via intramolecular domain association.","method":"Yeast two-hybrid; co-immunoprecipitation; immunofluorescence; NMR","journal":"Journal of molecular recognition","confidence":"Medium","confidence_rationale":"Tier 2 — two-hybrid confirmed by Co-IP, phosphorylation requirement demonstrated, single lab","pmids":["18853468"],"is_preprint":false},{"year":2010,"finding":"EGF-induced Grb7 tyrosine phosphorylation/activation recruits and activates Ras GTPases, subsequently promotes ERK1/2 phosphorylation, and drives tumor growth; Grb7 forms a signaling complex with EGFR and Ras.","method":"Co-immunoprecipitation; RasGTP pulldown assay; siRNA knockdown; xenograft tumor model; Western blot","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP complex with Ras-GTP pulldown, functional tumor assay, single lab","pmids":["20622016"],"is_preprint":false},{"year":2010,"finding":"GRB7 overexpression facilitates HER2/Neu tyrosine phosphorylation and activates downstream PLC-γ1/PKC and AKT pathways; conversely, GRB7 knockdown decreases HER2 tyrosine phosphorylation and AKT phosphorylation in breast cancer cells.","method":"Overexpression and siRNA knockdown; immunoblotting for phospho-HER2, phospho-AKT, phospho-PLC-γ1, MARCKS phosphorylation; xenograft tumor growth","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 — gain- and loss-of-function with phospho-signaling readouts, single lab","pmids":["17916906"],"is_preprint":false},{"year":2010,"finding":"Grb7 upregulation following lapatinib (HER2/PI3K inhibitor) treatment is driven by relief of Akt-mediated transcriptional repression of GRB7; constitutively active Akt prevents Grb7 upregulation; Grb7 removal by siRNA reduces breast cancer cell viability and enhances lapatinib activity.","method":"Retroviral transgenesis of constitutively active Akt; siRNA; quantitative PCR; Western blot; xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — epistasis with constitutively active Akt, siRNA rescue, in vivo model","pmids":["20126311"],"is_preprint":false},{"year":2011,"finding":"GRB7 inhibition reduces cell motility and invasion in triple-negative breast cancer cell lines and promotes apoptosis in 3D culture.","method":"siRNA knockdown; Boyden chamber migration/invasion assay; 3D culture apoptosis assay","journal":"Breast cancer research and treatment","confidence":"Medium","confidence_rationale":"Tier 2 — clean loss-of-function with defined phenotypic readout, multiple cell lines","pmids":["22005836"],"is_preprint":false},{"year":2011,"finding":"Full-length Grb7 can exist in a head-to-tail conformational state; Grb7 RA-PH domains bind the Grb7 SH2 domain with micromolar affinity (by ITC), suggesting intramolecular autoinhibition; Grb7 also interacts with Hax-1 (a cytoskeletal/anti-apoptotic protein) via RA and PH domains.","method":"Yeast two-hybrid; co-immunoprecipitation; ITC (intramolecular RA-PH vs SH2 binding)","journal":"Journal of molecular recognition","confidence":"Medium","confidence_rationale":"Tier 2 — ITC quantifies intramolecular interaction, supported by two-hybrid and Co-IP","pmids":["20665473"],"is_preprint":false},{"year":2011,"finding":"Crystal structure of the G7-18NATE cyclic peptide in complex with the Grb7 SH2 domain determined; key contacts involve peptide residues F2, G4, F9, and YDN motif; additional phage display identified analogues with micromolar affinity retaining the same contact residues.","method":"X-ray crystallography; phage display; ITC","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional validation by affinity measurements","pmids":["21802427"],"is_preprint":false},{"year":2012,"finding":"GRB7 overexpression or knockdown in ovarian cancer cells modulates ERK phosphorylation and FOXM1 levels in an ordered cascade (GRB7→ERK→FOXM1); FOXM1 overexpression cannot alter GRB7 or ERK levels, establishing GRB7 is upstream; GRB7 promotes cell migration/invasion through JNK signaling while proliferation involves ERK.","method":"Western blot; enforced expression and siRNA knockdown; specific kinase inhibitors (U0126, PD98059); FOXM1 inhibitor; cell migration/invasion assay; xenograft model","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological and genetic epistasis establishing pathway order, multiple cell lines","pmids":["23285101"],"is_preprint":false},{"year":2012,"finding":"Grb7 SH2 domain dimerizes (KD ~11 μM); mutation of Phe511 to Arg produces a monomeric SH2 domain; phosphorylation-mimic mutation Y80E in the SH2 domain impairs dimerization and alters thermodynamic characteristics of phosphotyrosine peptide binding.","method":"Sedimentation equilibrium ultracentrifugation; size-exclusion chromatography; site-directed mutagenesis; ITC; circular dichroism","journal":"Journal of molecular recognition / European biophysics journal","confidence":"High","confidence_rationale":"Tier 1 — multiple biophysical methods quantifying dimerization with mutagenesis","pmids":["22811067","15841400"],"is_preprint":false},{"year":2012,"finding":"GRB7 is identified as a context-dependent oncogene in the 17q12-21 amplicon; GRB7 overexpression enhances ERBB2 phosphorylation and AKT phosphorylation in an ERBB2-dependent context.","method":"Retrovirus-mediated gene transfer; expression screening; Western blot for phospho-ERBB2 and phospho-AKT","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — functional gain-of-function assay with phosphoprotein readouts, single lab","pmids":["22584052"],"is_preprint":false},{"year":2012,"finding":"Calmodulin regulates Grb7 nuclear translocation; a nuclear localization signal (NLS) overlaps the CaM-binding domain of Grb7; deletion of the CaM-binding domain prevents nuclear localization; CaM antagonist W-7 enhances Grb7 nuclear presence.","method":"Confocal microscopy; deletion mutants; CaM antagonist W-7 treatment; cellular fractionation","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 2 — deletion mutant demonstrates NLS/CaM-BD overlap, CaM antagonist confirms functional role, single lab","pmids":["22673522"],"is_preprint":false},{"year":2013,"finding":"In HER2+ breast cancer cells, GRB7 recruits SHC into the HER2-GRB7 signaling complex leading to RAS-GTP activation (proliferation); following integrin engagement, GRB7 is phosphorylated at tyrosine by FAK (pY397-dependent), and the FAK-GRB7 complex activates RAC1-GTP through recruitment of VAV2 (migration); GRB7 directly binds VAV2 after fibronectin engagement.","method":"Co-immunoprecipitation; RasGTP and Rac1-GTP pulldown assays; siRNA knockdown; fibronectin-stimulated adhesion; proliferation and migration assays","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — Co-IP and GTPase activation assays with siRNA, single lab, multiple mechanistic connections","pmids":["23593540"],"is_preprint":false},{"year":2013,"finding":"Deletion of the calmodulin-binding domain of Grb7 impairs cell migration, cell attachment to extracellular matrix, and actin cytoskeleton reorganization; cell-permeable CaM antagonists (W-7, W-13) inhibit migration of cells expressing wild-type Grb7 but not Grb7Δ, confirming CaM binding to Grb7 is required for normal Grb7-mediated migration.","method":"Deletion mutant expression; wound healing and Boyden chamber migration assay; CaM antagonists; cell attachment assay; actin staining","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — deletion mutant with pharmacological controls and multiple functional readouts, single lab","pmids":["23743201"],"is_preprint":false},{"year":2013,"finding":"Grb7 interacts with Filamin-a (actin-crosslinking cytoskeletal protein) via the Grb7 RA-PH domains and Filamin-a immunoglobulin-like repeat domains 16-19; Grb7 and Filamin-a co-localize in membrane ruffles upon EGF stimulation.","method":"Yeast two-hybrid; Co-immunoprecipitation; in vitro binding; immunofluorescence microscopy","journal":"Journal of molecular recognition","confidence":"Medium","confidence_rationale":"Tier 2 — two-hybrid confirmed by Co-IP and in vitro binding, co-localization upon EGF stimulation","pmids":["24089360"],"is_preprint":false},{"year":2016,"finding":"Pin1 negatively regulates Grb7 stability: JNK phosphorylates Grb7 on the Ser194-Pro motif, facilitating binding to Pin1's WW domain; Pin1's peptidyl-prolyl isomerase activity then promotes Grb7 degradation via the ubiquitin-proteasome pathway; Pin1-mediated Grb7 degradation affects G2-M cell cycle progression.","method":"Co-immunoprecipitation; ubiquitin-proteasome inhibitor (MG-132); Pin1 WW domain binding assay; cell cycle analysis; JNK inhibitor; mutagenesis of Ser194","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical and cell biological methods, single lab","pmids":["27658202"],"is_preprint":false},{"year":2017,"finding":"X-ray crystal structure of bicyclic peptide inhibitor G7-B4 in complex with the Grb7-SH2 domain determined; Arg462 in the BC loop is a key specificity determinant for G7-18NATE; Leu at the βD6 position is required for Grb7-SH2 binding; the closed staple linkage is essential for target interaction.","method":"X-ray crystallography; surface plasmon resonance (SPR); SH2 domain microarray (79 SH2 domains); mutagenesis","journal":"Scientific reports / Journal of medicinal chemistry","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with mutagenesis and SPR specificity profiling across 79 SH2 domains","pmids":["27257138","29083893"],"is_preprint":false},{"year":2020,"finding":"Calmodulin directly interacts with full-length Grb7 in a calcium-dependent manner; interaction is mediated through the RA-PH domain of Grb7 (not the SH2 domain); measured by surface plasmon resonance.","method":"SPR with purified full-length Grb7, RA-PH domain, and SH2 domain","journal":"International journal of molecular sciences","confidence":"High","confidence_rationale":"Tier 1 — direct binding quantified with purified proteins, domain localization of interaction, replicated within study","pmids":["32079204"],"is_preprint":false},{"year":2021,"finding":"Genome-wide CRISPR/Cas9 screen identified GRB7 as a driver of MEK inhibitor resistance in KRAS-mutant colorectal cancer; mass spectrometry of GRB7 immunoprecipitates identified PLK1 as the predominant interacting kinase; PLK1 inhibition suppresses FAK, STAT3, AKT, and 4EBP1 signaling downstream of RTK; combined PLK1 + MEK inhibition synergistically inhibits CRC cell proliferation and induces apoptosis.","method":"Genome-wide CRISPR/Cas9 screen; mass spectrometry of GRB7 immunoprecipitates; gain- and loss-of-function assays; combination drug treatment in vitro and in vivo xenograft","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 — unbiased CRISPR screen plus MS identification of interacting kinase and functional validation, single lab","pmids":["34718347"],"is_preprint":false},{"year":2016,"finding":"Grb7 and Hax1 co-localize partially to mitochondria in EGF-treated SKBR3 cells; Grb7 can affect Caspase3 cleavage of Hax1 isoform 1 in vitro; Grb7 expression slows Caspase3-mediated Hax1 cleavage in apoptotic cells and increases cell viability in apoptotic HeLa cells.","method":"Co-immunoprecipitation; immunofluorescence; in vitro Caspase3 cleavage assay; cell viability assay","journal":"Journal of molecular recognition","confidence":"Low","confidence_rationale":"Tier 3 — single lab, in vitro cleavage assay and Co-IP with partial mechanistic follow-up","pmids":["26869103"],"is_preprint":false},{"year":2024,"finding":"GRB7 interacts with Notch1 to activate Wnt/β-catenin pathways and promote EMT progression in HER2+ breast cancer; TCF12 transcription factor directly binds the GRB7 gene promoter (by ChIP) and promotes its transcription.","method":"RNA sequencing; ChIP-PCR; luciferase reporter assay; co-immunoprecipitation; xenograft model; siRNA knockdown","journal":"Journal of translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP demonstrates direct transcriptional regulation; Co-IP shows Notch1 interaction; functional rescue experiments","pmids":["39113057"],"is_preprint":false}],"current_model":"GRB7 is a multi-domain adaptor protein (containing an N-terminal RA-like domain, PH domain, and C-terminal SH2 domain) that is recruited via its SH2 domain to autophosphorylated receptor tyrosine kinases including HER2/ErbB2 (pY1139), ErbB3 (pY1180/1243), FAK (pY397), c-Kit (pY936), EphB1 (pY928), PDGFR (pY716/775), and Ret; at focal contacts, FAK phosphorylates Grb7, which is required for Grb7 to stimulate integrin-mediated cell migration by activating Ras-GTP (via SHC recruitment) and Rac1-GTP (via VAV2 recruitment); Grb7 also functions as an RNA-binding protein that represses mRNA translation by blocking eIF4E recruitment until FAK-mediated phosphorylation relieves this repression, and as a stress granule component whose disassembly is triggered by FAK-mediated hyperphosphorylation; calmodulin binds the Grb7 RA-PH domain in a calcium-dependent manner and regulates Grb7 membrane association and nuclear translocation; Grb7 protein stability is negatively regulated by JNK-mediated phosphorylation at Ser194-Pro, which recruits Pin1 and targets Grb7 for proteasomal degradation; in cancer, co-amplification with HER2 drives GRB7 overexpression, and GRB7-HER2 interaction enhances HER2 and AKT phosphorylation, while GRB7 also mediates resistance to MEK inhibitors through interaction with PLK1."},"narrative":{"teleology":[{"year":1994,"claim":"The initial question—what signaling proteins associate with the oncogenic receptor HER2—was answered by identifying GRB7 as a major SH2 domain-containing binding partner of phosphorylated HER2 in breast cancer cells, establishing GRB7 as an RTK-coupled adaptor protein.","evidence":"Expression cloning with phosphorylated EGFR C-terminus as probe; reciprocal co-immunoprecipitation from SKBR-3 cells","pmids":["7907978"],"confidence":"High","gaps":["Downstream signaling consequences of GRB7-HER2 interaction unknown","Whether GRB7 binds other RTKs not yet tested"]},{"year":1996,"claim":"The question of whether GRB7 is a general RTK adaptor was resolved by demonstrating direct SH2-mediated binding to PDGFR (pY716/pY775), Ret, and SHPTP2, revealing broad receptor engagement rather than HER2 exclusivity.","evidence":"GST pulldown with autophosphorylated receptors; site-directed mutagenesis of receptor tyrosines; kinase-dead Ret mutant; co-immunoprecipitation","pmids":["8940081","8631863","8622870"],"confidence":"High","gaps":["Functional consequences of these interactions not established","No downstream effectors identified"]},{"year":1997,"claim":"The structural basis for GRB7's preferential recognition of HER2 over other targets was clarified by mapping binding to pY1139 and identifying a single residue (Leu at βD6) in the SH2 domain as a key specificity determinant within the Grb7 family.","evidence":"Phosphopeptide competition and site-directed mutagenesis of SH2 domain","pmids":["9079677"],"confidence":"High","gaps":["No three-dimensional structure yet available","Binding affinities not quantified by biophysical methods"]},{"year":1998,"claim":"GRB7 receptor engagement was extended to heregulin-activated ErbB3/ErbB4, with pY1180 and pY1243 on ErbB3 identified as binding sites—establishing GRB7 as a pan-ErbB family adaptor also recruited by ErbB3 and ErbB4.","evidence":"Co-immunoprecipitation from breast cancer cells; ErbB3 point mutants; phosphopeptide competition; GST pulldown","pmids":["9516479"],"confidence":"High","gaps":["Downstream signaling from ErbB3/ErbB4-GRB7 complexes uncharacterized"]},{"year":1999,"claim":"The critical question of GRB7's cellular function was answered: GRB7 localizes to focal contacts via its SH2 domain, directly binds FAK at pY397, and overexpression enhances cell migration toward fibronectin while the isolated SH2 domain acts as a dominant negative—linking GRB7 to integrin-mediated cell migration.","evidence":"In vitro binding; co-immunoprecipitation; tetracycline-regulated expression; Boyden chamber migration assay; c-Kit pY936 mapping by mutagenesis","pmids":["10446223","10377264"],"confidence":"High","gaps":["GRB7 phosphorylation sites not mapped","Mechanism by which GRB7 promotes migration (effectors downstream) not identified"]},{"year":2000,"claim":"Several lines of evidence established that FAK directly phosphorylates GRB7 at focal contacts in a cell-adhesion-dependent manner, and that SH2-mediated focal contact targeting is indispensable for migration; additionally, phospho-caveolin-1 and the GTPase Rnd1 were identified as GRB7 binding partners.","evidence":"FAK−/− fibroblasts; chimeric molecules; phospho-specific antibodies; GST pulldown from SKBR3; yeast two-hybrid for Rnd1","pmids":["10893408","11075810","10664463"],"confidence":"High","gaps":["Specific phosphorylation sites on GRB7 not identified","Rnd1 interaction functional consequence unknown"]},{"year":2002,"claim":"GRB7's PH domain was shown to bind phosphoinositides (D3/D5), and this lipid interaction was required not for focal contact recruitment but for FAK-mediated phosphorylation and full pro-migratory function—revealing a two-step activation model requiring both SH2-mediated recruitment and PH-mediated lipid engagement.","evidence":"In vitro lipid-binding assay; PI3K inhibitor; FAK−/− cells; PH domain deletion mutants; migration assay","pmids":["12021278"],"confidence":"High","gaps":["Specific lipid species in vivo not determined","No structure of PH domain available"]},{"year":2002,"claim":"The SH2 domain inhibitor peptide G7-18NATE was discovered by phage display, selectively disrupting GRB7-ErbB interactions while sparing Grb2 and Grb14—establishing proof-of-concept for therapeutic targeting of GRB7.","evidence":"Phage display; competition binding assays; cell lysate immunoprecipitation inhibition","pmids":["11809769"],"confidence":"High","gaps":["In vivo efficacy not tested","Cellular permeability and pharmacokinetics unknown"]},{"year":2003,"claim":"NMR structure of the GRB7 SH2 domain in complex with ErbB2 pY1139 peptide provided atomic-level understanding of the binding mode, showing the phosphopeptide adopts a β-turn conformation.","evidence":"Solution NMR spectroscopy","pmids":["12975581"],"confidence":"High","gaps":["Full-length GRB7 structure not available","Autoinhibition mechanism not structurally characterized"]},{"year":2005,"claim":"Calmodulin was identified as a calcium-dependent regulator of GRB7, binding to an amphiphilic helix at residues 243–256 in the RA-PH region; CaM competes with phosphoinositide binding and regulates GRB7 membrane association, adding a calcium-sensing layer to GRB7 signaling.","evidence":"CaM-affinity chromatography; FRET between EYFP-GRB7 and ECFP-CaM in living cells; deletion mutants; CaM inhibitory peptides","pmids":["15806159"],"confidence":"High","gaps":["Physiological conditions triggering CaM-GRB7 interaction in vivo not defined","Effect on downstream signaling pathways unknown"]},{"year":2007,"claim":"A fundamentally new function was discovered: GRB7 is an RNA-binding protein that represses translation by binding the 5′-UTR of KOR mRNA and blocking eIF4E recruitment; FAK-mediated hyperphosphorylation of two C-terminal tyrosines relieves repression—linking Netrin-1/FAK signaling to translational control through GRB7.","evidence":"RNA-binding assay; in vitro translation assay; FAK phosphorylation assay; domain deletion and mutagenesis","pmids":["17318180"],"confidence":"High","gaps":["Full spectrum of GRB7-regulated mRNAs unknown","Structural basis for RNA recognition not determined"]},{"year":2007,"claim":"Crystal structure of the GRB7 SH2 domain (2.1 Å) revealed dimerization at micromolar affinity, and showed G7-18NATE binds at the ligand-binding surface while disrupting the dimer interface—establishing dimerization as a regulatable property of GRB7.","evidence":"X-ray crystallography; analytical ultracentrifugation; ITC; NMR titration","pmids":["17894853"],"confidence":"High","gaps":["Biological significance of dimerization in signaling not established","Full-length structure still unavailable"]},{"year":2008,"claim":"GRB7 was shown to be an integral component of stress granules, directly interacting with HuR and required for SG formation; FAK hyperphosphorylation upon stress termination dissociates GRB7 from HuR and drives SG disassembly—unifying GRB7's RNA-binding and FAK-regulated functions in the stress response.","evidence":"Co-immunoprecipitation; stress granule immunofluorescence; dominant-negative mutants; siRNA knockdown","pmids":["18273060"],"confidence":"High","gaps":["Whether SG role is independent of translational repression unclear","Phosphorylation sites mediating HuR release not mapped"]},{"year":2010,"claim":"GRB7 was placed in an RTK-Ras-ERK signaling axis: EGF-induced GRB7 phosphorylation promotes RAS-GTP loading and ERK activation, and GRB7 overexpression enhances HER2 phosphorylation and AKT activation in breast cancer—establishing GRB7 as an amplifier of RTK signaling.","evidence":"Co-immunoprecipitation; RasGTP pulldown; siRNA knockdown; xenograft tumor model; phospho-signaling immunoblotting","pmids":["20622016","17916906"],"confidence":"Medium","gaps":["Mechanism by which GRB7 enhances HER2 phosphorylation not established","Whether GRB7 acts catalytically or as a scaffold unresolved"]},{"year":2012,"claim":"CaM was found to regulate GRB7 nuclear translocation through overlapping NLS and CaM-binding domains; CaM antagonism enhanced nuclear GRB7, while SH2 domain dimerization was quantified (KD ~11 μM) and a monomeric mutant (F511R) was engineered, establishing intramolecular and intermolecular regulatory mechanisms.","evidence":"Confocal microscopy with CaM antagonist W-7; deletion mutants; sedimentation equilibrium ultracentrifugation; ITC","pmids":["22673522","22811067"],"confidence":"Medium","gaps":["Nuclear function of GRB7 uncharacterized","How autoinhibition and dimerization are coordinated unclear"]},{"year":2013,"claim":"A bifurcation model was established in HER2+ cells: GRB7 recruits SHC to activate RAS-ERK for proliferation, and separately, FAK-phosphorylated GRB7 recruits VAV2 to activate RAC1 for migration; CaM binding to GRB7 was shown to be required for normal cell migration and ECM attachment.","evidence":"Co-IP with RasGTP and Rac1-GTP pulldown after fibronectin stimulation; siRNA; CaM antagonists W-7/W-13 with deletion mutants; wound healing assay","pmids":["23593540","23743201"],"confidence":"Medium","gaps":["Direct VAV2-GRB7 binding interface not mapped","How CaM and FAK phosphorylation are coordinated not resolved"]},{"year":2016,"claim":"A new negative regulatory mechanism was uncovered: JNK phosphorylates GRB7 at Ser194-Pro, enabling Pin1 WW domain binding and prolyl isomerization that targets GRB7 for proteasomal degradation, affecting G2-M progression.","evidence":"Co-immunoprecipitation; MG-132 proteasome inhibitor; Pin1 WW domain binding assay; JNK inhibitor; Ser194 mutagenesis; cell cycle analysis","pmids":["27658202"],"confidence":"Medium","gaps":["E3 ubiquitin ligase responsible not identified","Physiological triggers of JNK-mediated GRB7 degradation unclear"]},{"year":2017,"claim":"Crystal structures of bicyclic peptide G7-B4 with the GRB7 SH2 domain, combined with SH2 domain microarray profiling across 79 domains, confirmed exquisite selectivity of the inhibitor scaffold and identified Arg462 and βD6-Leu as key specificity determinants.","evidence":"X-ray crystallography; SPR; SH2 domain microarray (79 domains); mutagenesis","pmids":["27257138","29083893"],"confidence":"High","gaps":["No in vivo pharmacological data for optimized inhibitors","Whether disrupting SH2 interactions is sufficient for anti-tumor effect in vivo unknown"]},{"year":2021,"claim":"An unbiased CRISPR screen revealed GRB7 as a driver of MEK inhibitor resistance in KRAS-mutant CRC; mass spectrometry identified PLK1 as the predominant GRB7-associated kinase, and combined PLK1 + MEK inhibition synergistically suppressed CRC growth—expanding GRB7 function into drug resistance and implicating PLK1 as a key effector.","evidence":"Genome-wide CRISPR/Cas9 screen; GRB7 IP-mass spectrometry; combination drug treatment in vitro and xenograft","pmids":["34718347"],"confidence":"Medium","gaps":["Direct GRB7-PLK1 binding mode not characterized","Whether PLK1 phosphorylates GRB7 not tested","Mechanism linking GRB7-PLK1 to FAK/STAT3/AKT/4EBP1 not fully delineated"]},{"year":2024,"claim":"GRB7 was shown to interact with Notch1 to activate Wnt/β-catenin and EMT in HER2+ breast cancer, and TCF12 was identified as a direct transcriptional activator of the GRB7 promoter—revealing upstream transcriptional regulation and a new downstream pathway.","evidence":"ChIP-PCR; luciferase reporter assay; co-immunoprecipitation; xenograft model; RNA sequencing","pmids":["39113057"],"confidence":"Medium","gaps":["Direct vs. indirect nature of GRB7-Notch1 interaction not established","TCF12-GRB7 axis not validated in non-breast contexts"]},{"year":null,"claim":"Key unresolved questions include the full-length GRB7 three-dimensional structure (needed to understand autoinhibition), the complete repertoire of GRB7-regulated mRNAs, the E3 ligase mediating Pin1-triggered degradation, the mechanism by which GRB7 enhances HER2 phosphorylation, and the nuclear functions of GRB7.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Full-length structure not determined","Nuclear function not characterized","Complete mRNA target repertoire unknown","E3 ubiquitin ligase for GRB7 degradation not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,6,9,35]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[21,23]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[21,26]},{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[15]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9,23]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[9,15,20]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[34]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[9,37]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,6,25,26,35]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[6,9,35]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[26,33,41]}],"complexes":[],"partners":["ERBB2","FAK","SHC1","VAV2","ELAVL1","CALM1","FLNA","PLK1"],"other_free_text":[]},"mechanistic_narrative":"GRB7 is a multi-domain adaptor protein that couples receptor tyrosine kinase (RTK) signaling to cell migration, translational regulation, and stress granule dynamics. Its C-terminal SH2 domain binds autophosphorylated RTKs—including HER2 (pY1139), ErbB3, FAK (pY397), PDGFR, c-Kit, EphB1, and Ret—while its PH domain engages D3/D5-phosphoinositides required for FAK-mediated phosphorylation and full pro-migratory activity, and its N-terminal RA-PH region mediates calcium-dependent calmodulin binding that regulates membrane association and nuclear translocation [PMID:7907978, PMID:10446223, PMID:12021278, PMID:15806159]. At focal adhesions, FAK phosphorylates GRB7, enabling recruitment of SHC to activate RAS-ERK signaling and VAV2 to activate RAC1, thereby promoting integrin-dependent cell migration [PMID:10893408, PMID:23593540]. GRB7 also functions as an RNA-binding translational repressor that blocks eIF4E loading onto target mRNAs until FAK-mediated hyperphosphorylation relieves repression, and it is an integral stress granule component whose FAK-triggered dissociation drives stress granule disassembly [PMID:17318180, PMID:18273060]. GRB7 protein stability is negatively regulated by JNK phosphorylation at Ser194-Pro, which recruits Pin1 for proteasomal degradation, and in cancer GRB7 co-amplification with HER2 enhances HER2/AKT phosphorylation while also mediating MEK inhibitor resistance through interaction with PLK1 [PMID:27658202, PMID:22584052, PMID:34718347]."},"prefetch_data":{"uniprot":{"accession":"Q14451","full_name":"Growth factor receptor-bound protein 7","aliases":["B47","Epidermal growth factor receptor GRB-7","GRB7 adapter protein"],"length_aa":532,"mass_kda":59.7,"function":"Adapter protein that interacts with the cytoplasmic domain of numerous receptor kinases and modulates down-stream signaling. Promotes activation of down-stream protein kinases, including STAT3, AKT1, MAPK1 and/or MAPK3. Promotes activation of HRAS. Plays a role in signal transduction in response to EGF. Plays a role in the regulation of cell proliferation and cell migration. Plays a role in the assembly and stability of RNA stress granules. Binds to the 5'UTR of target mRNA molecules and represses translation of target mRNA species, when not phosphorylated. Phosphorylation impairs RNA binding and promotes stress granule disassembly during recovery after cellular stress (By similarity)","subcellular_location":"Cytoplasm; Cell junction, focal adhesion; Cell membrane; Cytoplasmic granule; Cell projection","url":"https://www.uniprot.org/uniprotkb/Q14451/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GRB7","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GRB7","total_profiled":1310},"omim":[{"mim_id":"611802","title":"MIGRATION AND INVASION ENHANCER 1; MIEN1","url":"https://www.omim.org/entry/611802"},{"mim_id":"611801","title":"POST-GPI ATTACHMENT TO PROTEINS 3; PGAP3","url":"https://www.omim.org/entry/611801"},{"mim_id":"611404","title":"LYMPHOCYTE ANTIGEN 6 FAMILY, MEMBER G6F; LY6G6F","url":"https://www.omim.org/entry/611404"},{"mim_id":"611221","title":"GASDERMIN B; GSDMB","url":"https://www.omim.org/entry/611221"},{"mim_id":"609038","title":"RHO FAMILY GTPase 1; RND1","url":"https://www.omim.org/entry/609038"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"esophagus","ntpm":58.0},{"tissue":"kidney","ntpm":59.1}],"url":"https://www.proteinatlas.org/search/GRB7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q14451","domains":[{"cath_id":"3.10.20.90","chopping":"101-182","consensus_level":"high","plddt":93.8984,"start":101,"end":182},{"cath_id":"2.30.29.30","chopping":"188-351","consensus_level":"high","plddt":88.3569,"start":188,"end":351},{"cath_id":"3.30.505.10","chopping":"426-525","consensus_level":"high","plddt":94.143,"start":426,"end":525}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14451","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q14451-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q14451-F1-predicted_aligned_error_v6.png","plddt_mean":78.0},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GRB7","jax_strain_url":"https://www.jax.org/strain/search?query=GRB7"},"sequence":{"accession":"Q14451","fasta_url":"https://rest.uniprot.org/uniprotkb/Q14451.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q14451/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q14451"}},"corpus_meta":[{"pmid":"11075810","id":"PMC_11075810","title":"Constitutive 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GRB7 can also bind tyrosine-phosphorylated SHC.\",\n      \"method\": \"Expression cloning using phosphorylated EGFR C-terminus as probe; co-immunoprecipitation from cell lysates\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, foundational discovery replicated by multiple subsequent labs\",\n      \"pmids\": [\"7907978\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"GRB7 SH2 domain directly binds to autophosphorylated PDGF beta-receptor at Tyr-716 and Tyr-775 in vitro and in vivo; GRB7 also associates with Shc after PDGF alpha- or beta-receptor activation.\",\n      \"method\": \"GST pulldown with autophosphorylated PDGF receptor; site-directed mutagenesis of receptor tyrosines; co-immunoprecipitation; phosphopeptide competition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro binding assay with mutagenesis plus in vivo co-IP\",\n      \"pmids\": [\"8940081\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"GRB7 SH2 domain directly associates with the Ret receptor tyrosine kinase in vitro and in vivo in an autophosphorylation-dependent manner; a kinase-defective Ret mutant cannot bind GRB7.\",\n      \"method\": \"In vitro binding assay; co-immunoprecipitation; kinase-dead Ret mutant\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding demonstrated with kinase-dead mutant control\",\n      \"pmids\": [\"8631863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"GRB7 SH2 domain interacts with tyrosine-phosphorylated SHPTP2 at Tyr-580 in the C-terminal tail of SHPTP2, as detected by modified two-hybrid system and confirmed by in vitro binding under phosphorylation conditions.\",\n      \"method\": \"Yeast two-hybrid with exogenous tyrosine kinase; in vitro binding assay; deletion/mutation mapping\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two-hybrid plus in vitro binding, single lab\",\n      \"pmids\": [\"8622870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The Grb7 SH2 domain binds preferentially to Tyr-1139 of ErbB2; a single residue at position betaD6 (Leu in Grb7 vs. Gln in Grb14) is a key determinant of high-affinity ErbB2 binding specificity within the Grb7 family.\",\n      \"method\": \"Phosphopeptide competition; site-directed mutagenesis of SH2 domain; in vitro binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus in vitro binding with phosphopeptide competition\",\n      \"pmids\": [\"9079677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Grb7 is recruited by heregulin-activated ErbB3 and ErbB4 via its SH2 domain; Tyr-1180 (major) and Tyr-1243 (minor) of ErbB3 are the binding sites; Arg at position +3 relative to the phosphotyrosine acts as a selectivity determinant favoring Grb7 over Grb2.\",\n      \"method\": \"Co-immunoprecipitation from breast cancer cell lines; ErbB3 point mutants; phosphopeptide competition; GST pulldown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — site-directed mutagenesis plus phosphopeptide competition and pulldown, multiple orthogonal methods\",\n      \"pmids\": [\"9516479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The Grb7 SH2 domain directly interacts with FAK at its major autophosphorylation site Tyr-397 in vitro and in vivo; this interaction is cell adhesion-dependent (integrin signaling context); overexpression of Grb7 enhances cell migration toward fibronectin whereas its SH2 domain alone inhibits migration.\",\n      \"method\": \"In vitro binding assay; co-immunoprecipitation; tetracycline-regulated expression; Boyden chamber migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct in vitro binding with defined site, clean gain/loss-of-function migration assay, replicated\",\n      \"pmids\": [\"10446223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Grb7 binds to c-Kit/stem cell factor receptor (SCFR) at autophosphorylated Tyr-936 in the C-terminal tail via its SH2 domain; Grb2 binds both Tyr-703 and Tyr-936, whereas Grb7 binding is selective for Tyr-936.\",\n      \"method\": \"In vivo autophosphorylation mapping; SH2 domain binding experiments; site-directed mutagenesis of c-Kit\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis plus selective binding assays demonstrating site specificity\",\n      \"pmids\": [\"10377264\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Sequence analysis identified a Ras-associating (RA)-like domain in the N-terminal region of Grb7/Grb10/Grb14 family proteins, suggesting direct interaction potential with Ras-like GTPases.\",\n      \"method\": \"Computational sequence analysis (BLAST, HCA, HMM profiling) with structural comparison\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — computational prediction only\",\n      \"pmids\": [\"10334925\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Grb7 localizes partially to focal contacts via its SH2 domain; SH2 domain deletion eliminates focal contact localization and abolishes Grb7-stimulated cell migration; FAK phosphorylates Grb7 in a kinase-activity-dependent and cell-adhesion-dependent manner, and Grb7 is a physiological substrate of FAK (phosphorylation reduced in FAK-/- cells).\",\n      \"method\": \"Deletion mutants and chimeric molecules; focal contacts localization by microscopy; FAK-/- fibroblasts; tetracycline-regulated expression; migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic rescue experiment with chimeric molecules, FAK knockout cells, clean mechanistic dissection\",\n      \"pmids\": [\"10893408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Tyrosine-phosphorylated caveolin-1 (at Tyr-14, phosphorylated by c-Src) binds to Grb7 via its SH2 domain both in vitro and in vivo; this interaction augments anchorage-independent growth and EGF-stimulated cell migration.\",\n      \"method\": \"In vitro GST pulldown; co-immunoprecipitation; monoclonal antibody specific for pTyr-14 caveolin-1; functional migration and growth assays\",\n      \"journal\": \"Molecular endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vitro binding confirmed in vivo with functional consequences, multiple methods\",\n      \"pmids\": [\"11075810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Grb7 interacts with the Rho family GTPase Rnd1 (constitutively GTP-bound); the interaction involves the switch II loop of Rnd1 and the SH2 domain of Grb7; confirmed by two-hybrid, in vitro binding, and pulldown from SKBR3 cells.\",\n      \"method\": \"Yeast two-hybrid; in vitro binding; GST pulldown from breast cancer cell line\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, three methods but no functional consequences determined\",\n      \"pmids\": [\"10664463\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Grb7 binds activated insulin receptors (via both SH2 domain and PIR/phosphotyrosine-interacting region) but is not a substrate of the insulin receptor tyrosine kinase; it preferentially associates with the insulin receptor over EGFR, FGF receptor, and Ret.\",\n      \"method\": \"Yeast two-hybrid; GST pulldown; co-immunoprecipitation; domain deletion analysis\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple methods, single lab, specificity shown vs. other receptors\",\n      \"pmids\": [\"10803466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Targeting Grb7 (as Grb7-FAT chimera) to focal contacts stimulates cell migration but not cell cycle progression; distinct FAK signaling complexes regulate cell migration (Grb7) vs. cell cycle progression (Grb2).\",\n      \"method\": \"Chimeric fusion proteins (FAT sequence fused to signaling molecules); cell migration assay; cell cycle analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean epistasis experiment with chimeric molecules separating migration from proliferation\",\n      \"pmids\": [\"11418135\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The SH2 domain of Grb7 interacts with EphB1 receptor at Tyr-928 (primary site); EphB1 autophosphorylation is required for the interaction; EphB1 phosphorylates Grb7; co-expression of Grb7 with EphB1 enhances fibroblast motility while the Grb7 SH2 domain alone inhibits EphB1-stimulated migration.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; site-directed mutagenesis of EphB1; cell motility assay; EphB1 ligand (ephrinB1) stimulation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — yeast two-hybrid confirmed by Co-IP, site mapping by mutagenesis, functional migration assay\",\n      \"pmids\": [\"12223469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"The Grb7 PH domain binds phosphoinositides (with preference for D3- and D5-phosphoinositides) both in vitro and in intact cells; PH domain-phosphoinositide interaction is required for FAK-mediated phosphorylation of Grb7 (though not for Grb7-FAK interaction or focal contact recruitment) and contributes to Grb7-stimulated cell migration; PI 3-kinase activity regulates this interaction.\",\n      \"method\": \"Lipid-binding assay in vitro; intact cell phosphoinositide binding; deletion mutants; PI3K inhibitor; FAK-/- cells; migration assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including in vitro lipid binding, genetic knockout, specific inhibitors, and functional readout\",\n      \"pmids\": [\"12021278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Novel non-phosphorylated peptides with a YXN motif bind selectively to the Grb7 SH2 domain (not Grb2 or Grb14 SH2); the cyclic structure is required for binding; the peptide G7-18 inhibits Grb7 association with ErbB family RTKs (particularly ErbB3) in cell lysates in a dose-dependent manner.\",\n      \"method\": \"Phage display random peptide libraries; competition binding assays; cell lysate immunoprecipitation inhibition\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — phage display with confirmed binding specificity and functional inhibition of endogenous protein interactions\",\n      \"pmids\": [\"11809769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Solution NMR structure of the human Grb7 SH2 domain in complex with the ErbB2 pY1139 phosphopeptide; the erbB2 peptide binds in a beta-turn conformation; structural basis for recognition specificity characterized.\",\n      \"method\": \"NMR spectroscopy; solution structure determination\",\n      \"journal\": \"Journal of biomolecular NMR\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — NMR structure with natural ligand peptide\",\n      \"pmids\": [\"12975581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Grb7 binds to the immunoglobulin superfamily receptor G6f via the Grb7 SH2 domain in a phosphorylation-dependent manner (pY281 of G6f); antibody cross-linking of G6f activates MAP kinase signaling.\",\n      \"method\": \"GST pulldown; immunoprecipitation; MAP kinase activation assay with MEK inhibitors\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pulldown confirmed by Co-IP, functional downstream signaling shown\",\n      \"pmids\": [\"12852788\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Grb7 (but not Grb10) inhibits FGF receptor-induced maturation in Xenopus oocytes; this correlates with Grb7 binding to the receptor and inhibition of the Ras-dependent pathway; PIR and SH2 domains of Grb7 are differentially involved in FGFR signaling inhibition.\",\n      \"method\": \"Xenopus oocyte maturation assay; injection of Grb7 protein; domain deletion analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional epistasis in Xenopus oocyte system with domain dissection\",\n      \"pmids\": [\"12885405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Grb7 and its variant GRB7V are calmodulin (CaM)-binding proteins; the CaM-binding domain maps to an amphiphilic helix at residues 243-256 in the proximal PH domain region; CaM competes with phosphoinositide binding to Grb7; CaM regulates intracellular mobilization of Grb7 and its membrane association; ErbB2 activation by heregulin decreases membrane-associated Grb7 in a CaM-dependent manner.\",\n      \"method\": \"CaM-affinity chromatography; biotinylated CaM overlay; deletion mutants; phosphoinositide competition; cell-permeable CaM inhibitory peptides; FRET between EYFP-Grb7 and ECFP-CaM in living cells\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal methods including FRET in live cells, CaM affinity, domain mapping, and functional consequence\",\n      \"pmids\": [\"15806159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Grb7 is an RNA-binding protein that serves as a molecular adaptor linking Netrin-1/FAK signaling to translational regulation; Grb7 binds the first stem loop of kappa opioid receptor (KOR) mRNA 5'-UTR and blocks eIF4E recruitment, repressing translation; FAK-mediated hyperphosphorylation of two C-terminal tyrosines of Grb7 reduces its RNA-binding and translation-repressive activity.\",\n      \"method\": \"RNA-binding assay; in vitro translation assay; FAK phosphorylation assay; co-immunoprecipitation; domain deletion and mutagenesis\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted RNA binding and translation repression in vitro, mechanistic link to FAK phosphorylation established\",\n      \"pmids\": [\"17318180\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Crystal structure of the Grb7 SH2 domain solved to 2.1 Å resolution; the SH2 domain dimerizes with KD in the μM range (both for full-length Grb7 and SH2 domain alone); G7-18NATE cyclic peptide binds Grb7-SH2 with KD ~35.7 μM and disrupts both the ligand-binding surface and the dimer interface.\",\n      \"method\": \"X-ray crystallography (2.1 Å); analytical ultracentrifugation; ITC; NMR spectroscopy titration\",\n      \"journal\": \"BMC structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with multiple orthogonal biophysical validation methods\",\n      \"pmids\": [\"17894853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Grb7 is an integral component of stress granules (SGs) and directly interacts with HuR; Grb7 is required for SG formation in response to stress; upon stress termination, FAK hyperphosphorylates Grb7, causing loss of HuR interaction and Grb7 dissociation from SG components, thereby driving SG disassembly; dominant-negative hypophospho-mutants of FAK and Grb7 attenuate SG disassembly.\",\n      \"method\": \"Co-immunoprecipitation; stress granule immunofluorescence; dominant-negative mutants; FAK kinase assay; siRNA knockdown\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal Co-IP, dominant-negative mutants, and siRNA with clear cellular phenotype, replicated within study\",\n      \"pmids\": [\"18273060\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Grb7 interacts with the transcriptional regulator FHL2 via its RA and PH domains (not the SH2 domain); this interaction occurs in mammalian cells and requires Grb7 to be tyrosine phosphorylated; NMR evidence supports a model of Grb7 autoinhibition via intramolecular domain association.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; immunofluorescence; NMR\",\n      \"journal\": \"Journal of molecular recognition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two-hybrid confirmed by Co-IP, phosphorylation requirement demonstrated, single lab\",\n      \"pmids\": [\"18853468\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"EGF-induced Grb7 tyrosine phosphorylation/activation recruits and activates Ras GTPases, subsequently promotes ERK1/2 phosphorylation, and drives tumor growth; Grb7 forms a signaling complex with EGFR and Ras.\",\n      \"method\": \"Co-immunoprecipitation; RasGTP pulldown assay; siRNA knockdown; xenograft tumor model; Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP complex with Ras-GTP pulldown, functional tumor assay, single lab\",\n      \"pmids\": [\"20622016\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GRB7 overexpression facilitates HER2/Neu tyrosine phosphorylation and activates downstream PLC-γ1/PKC and AKT pathways; conversely, GRB7 knockdown decreases HER2 tyrosine phosphorylation and AKT phosphorylation in breast cancer cells.\",\n      \"method\": \"Overexpression and siRNA knockdown; immunoblotting for phospho-HER2, phospho-AKT, phospho-PLC-γ1, MARCKS phosphorylation; xenograft tumor growth\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function with phospho-signaling readouts, single lab\",\n      \"pmids\": [\"17916906\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Grb7 upregulation following lapatinib (HER2/PI3K inhibitor) treatment is driven by relief of Akt-mediated transcriptional repression of GRB7; constitutively active Akt prevents Grb7 upregulation; Grb7 removal by siRNA reduces breast cancer cell viability and enhances lapatinib activity.\",\n      \"method\": \"Retroviral transgenesis of constitutively active Akt; siRNA; quantitative PCR; Western blot; xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — epistasis with constitutively active Akt, siRNA rescue, in vivo model\",\n      \"pmids\": [\"20126311\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"GRB7 inhibition reduces cell motility and invasion in triple-negative breast cancer cell lines and promotes apoptosis in 3D culture.\",\n      \"method\": \"siRNA knockdown; Boyden chamber migration/invasion assay; 3D culture apoptosis assay\",\n      \"journal\": \"Breast cancer research and treatment\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean loss-of-function with defined phenotypic readout, multiple cell lines\",\n      \"pmids\": [\"22005836\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Full-length Grb7 can exist in a head-to-tail conformational state; Grb7 RA-PH domains bind the Grb7 SH2 domain with micromolar affinity (by ITC), suggesting intramolecular autoinhibition; Grb7 also interacts with Hax-1 (a cytoskeletal/anti-apoptotic protein) via RA and PH domains.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; ITC (intramolecular RA-PH vs SH2 binding)\",\n      \"journal\": \"Journal of molecular recognition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ITC quantifies intramolecular interaction, supported by two-hybrid and Co-IP\",\n      \"pmids\": [\"20665473\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Crystal structure of the G7-18NATE cyclic peptide in complex with the Grb7 SH2 domain determined; key contacts involve peptide residues F2, G4, F9, and YDN motif; additional phage display identified analogues with micromolar affinity retaining the same contact residues.\",\n      \"method\": \"X-ray crystallography; phage display; ITC\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional validation by affinity measurements\",\n      \"pmids\": [\"21802427\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GRB7 overexpression or knockdown in ovarian cancer cells modulates ERK phosphorylation and FOXM1 levels in an ordered cascade (GRB7→ERK→FOXM1); FOXM1 overexpression cannot alter GRB7 or ERK levels, establishing GRB7 is upstream; GRB7 promotes cell migration/invasion through JNK signaling while proliferation involves ERK.\",\n      \"method\": \"Western blot; enforced expression and siRNA knockdown; specific kinase inhibitors (U0126, PD98059); FOXM1 inhibitor; cell migration/invasion assay; xenograft model\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic epistasis establishing pathway order, multiple cell lines\",\n      \"pmids\": [\"23285101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Grb7 SH2 domain dimerizes (KD ~11 μM); mutation of Phe511 to Arg produces a monomeric SH2 domain; phosphorylation-mimic mutation Y80E in the SH2 domain impairs dimerization and alters thermodynamic characteristics of phosphotyrosine peptide binding.\",\n      \"method\": \"Sedimentation equilibrium ultracentrifugation; size-exclusion chromatography; site-directed mutagenesis; ITC; circular dichroism\",\n      \"journal\": \"Journal of molecular recognition / European biophysics journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple biophysical methods quantifying dimerization with mutagenesis\",\n      \"pmids\": [\"22811067\", \"15841400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"GRB7 is identified as a context-dependent oncogene in the 17q12-21 amplicon; GRB7 overexpression enhances ERBB2 phosphorylation and AKT phosphorylation in an ERBB2-dependent context.\",\n      \"method\": \"Retrovirus-mediated gene transfer; expression screening; Western blot for phospho-ERBB2 and phospho-AKT\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional gain-of-function assay with phosphoprotein readouts, single lab\",\n      \"pmids\": [\"22584052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Calmodulin regulates Grb7 nuclear translocation; a nuclear localization signal (NLS) overlaps the CaM-binding domain of Grb7; deletion of the CaM-binding domain prevents nuclear localization; CaM antagonist W-7 enhances Grb7 nuclear presence.\",\n      \"method\": \"Confocal microscopy; deletion mutants; CaM antagonist W-7 treatment; cellular fractionation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — deletion mutant demonstrates NLS/CaM-BD overlap, CaM antagonist confirms functional role, single lab\",\n      \"pmids\": [\"22673522\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"In HER2+ breast cancer cells, GRB7 recruits SHC into the HER2-GRB7 signaling complex leading to RAS-GTP activation (proliferation); following integrin engagement, GRB7 is phosphorylated at tyrosine by FAK (pY397-dependent), and the FAK-GRB7 complex activates RAC1-GTP through recruitment of VAV2 (migration); GRB7 directly binds VAV2 after fibronectin engagement.\",\n      \"method\": \"Co-immunoprecipitation; RasGTP and Rac1-GTP pulldown assays; siRNA knockdown; fibronectin-stimulated adhesion; proliferation and migration assays\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — Co-IP and GTPase activation assays with siRNA, single lab, multiple mechanistic connections\",\n      \"pmids\": [\"23593540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Deletion of the calmodulin-binding domain of Grb7 impairs cell migration, cell attachment to extracellular matrix, and actin cytoskeleton reorganization; cell-permeable CaM antagonists (W-7, W-13) inhibit migration of cells expressing wild-type Grb7 but not Grb7Δ, confirming CaM binding to Grb7 is required for normal Grb7-mediated migration.\",\n      \"method\": \"Deletion mutant expression; wound healing and Boyden chamber migration assay; CaM antagonists; cell attachment assay; actin staining\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — deletion mutant with pharmacological controls and multiple functional readouts, single lab\",\n      \"pmids\": [\"23743201\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Grb7 interacts with Filamin-a (actin-crosslinking cytoskeletal protein) via the Grb7 RA-PH domains and Filamin-a immunoglobulin-like repeat domains 16-19; Grb7 and Filamin-a co-localize in membrane ruffles upon EGF stimulation.\",\n      \"method\": \"Yeast two-hybrid; Co-immunoprecipitation; in vitro binding; immunofluorescence microscopy\",\n      \"journal\": \"Journal of molecular recognition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — two-hybrid confirmed by Co-IP and in vitro binding, co-localization upon EGF stimulation\",\n      \"pmids\": [\"24089360\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Pin1 negatively regulates Grb7 stability: JNK phosphorylates Grb7 on the Ser194-Pro motif, facilitating binding to Pin1's WW domain; Pin1's peptidyl-prolyl isomerase activity then promotes Grb7 degradation via the ubiquitin-proteasome pathway; Pin1-mediated Grb7 degradation affects G2-M cell cycle progression.\",\n      \"method\": \"Co-immunoprecipitation; ubiquitin-proteasome inhibitor (MG-132); Pin1 WW domain binding assay; cell cycle analysis; JNK inhibitor; mutagenesis of Ser194\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical and cell biological methods, single lab\",\n      \"pmids\": [\"27658202\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"X-ray crystal structure of bicyclic peptide inhibitor G7-B4 in complex with the Grb7-SH2 domain determined; Arg462 in the BC loop is a key specificity determinant for G7-18NATE; Leu at the βD6 position is required for Grb7-SH2 binding; the closed staple linkage is essential for target interaction.\",\n      \"method\": \"X-ray crystallography; surface plasmon resonance (SPR); SH2 domain microarray (79 SH2 domains); mutagenesis\",\n      \"journal\": \"Scientific reports / Journal of medicinal chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with mutagenesis and SPR specificity profiling across 79 SH2 domains\",\n      \"pmids\": [\"27257138\", \"29083893\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Calmodulin directly interacts with full-length Grb7 in a calcium-dependent manner; interaction is mediated through the RA-PH domain of Grb7 (not the SH2 domain); measured by surface plasmon resonance.\",\n      \"method\": \"SPR with purified full-length Grb7, RA-PH domain, and SH2 domain\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding quantified with purified proteins, domain localization of interaction, replicated within study\",\n      \"pmids\": [\"32079204\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Genome-wide CRISPR/Cas9 screen identified GRB7 as a driver of MEK inhibitor resistance in KRAS-mutant colorectal cancer; mass spectrometry of GRB7 immunoprecipitates identified PLK1 as the predominant interacting kinase; PLK1 inhibition suppresses FAK, STAT3, AKT, and 4EBP1 signaling downstream of RTK; combined PLK1 + MEK inhibition synergistically inhibits CRC cell proliferation and induces apoptosis.\",\n      \"method\": \"Genome-wide CRISPR/Cas9 screen; mass spectrometry of GRB7 immunoprecipitates; gain- and loss-of-function assays; combination drug treatment in vitro and in vivo xenograft\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — unbiased CRISPR screen plus MS identification of interacting kinase and functional validation, single lab\",\n      \"pmids\": [\"34718347\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Grb7 and Hax1 co-localize partially to mitochondria in EGF-treated SKBR3 cells; Grb7 can affect Caspase3 cleavage of Hax1 isoform 1 in vitro; Grb7 expression slows Caspase3-mediated Hax1 cleavage in apoptotic cells and increases cell viability in apoptotic HeLa cells.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence; in vitro Caspase3 cleavage assay; cell viability assay\",\n      \"journal\": \"Journal of molecular recognition\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single lab, in vitro cleavage assay and Co-IP with partial mechanistic follow-up\",\n      \"pmids\": [\"26869103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"GRB7 interacts with Notch1 to activate Wnt/β-catenin pathways and promote EMT progression in HER2+ breast cancer; TCF12 transcription factor directly binds the GRB7 gene promoter (by ChIP) and promotes its transcription.\",\n      \"method\": \"RNA sequencing; ChIP-PCR; luciferase reporter assay; co-immunoprecipitation; xenograft model; siRNA knockdown\",\n      \"journal\": \"Journal of translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP demonstrates direct transcriptional regulation; Co-IP shows Notch1 interaction; functional rescue experiments\",\n      \"pmids\": [\"39113057\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"GRB7 is a multi-domain adaptor protein (containing an N-terminal RA-like domain, PH domain, and C-terminal SH2 domain) that is recruited via its SH2 domain to autophosphorylated receptor tyrosine kinases including HER2/ErbB2 (pY1139), ErbB3 (pY1180/1243), FAK (pY397), c-Kit (pY936), EphB1 (pY928), PDGFR (pY716/775), and Ret; at focal contacts, FAK phosphorylates Grb7, which is required for Grb7 to stimulate integrin-mediated cell migration by activating Ras-GTP (via SHC recruitment) and Rac1-GTP (via VAV2 recruitment); Grb7 also functions as an RNA-binding protein that represses mRNA translation by blocking eIF4E recruitment until FAK-mediated phosphorylation relieves this repression, and as a stress granule component whose disassembly is triggered by FAK-mediated hyperphosphorylation; calmodulin binds the Grb7 RA-PH domain in a calcium-dependent manner and regulates Grb7 membrane association and nuclear translocation; Grb7 protein stability is negatively regulated by JNK-mediated phosphorylation at Ser194-Pro, which recruits Pin1 and targets Grb7 for proteasomal degradation; in cancer, co-amplification with HER2 drives GRB7 overexpression, and GRB7-HER2 interaction enhances HER2 and AKT phosphorylation, while GRB7 also mediates resistance to MEK inhibitors through interaction with PLK1.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"GRB7 is a multi-domain adaptor protein that couples receptor tyrosine kinase (RTK) signaling to cell migration, translational regulation, and stress granule dynamics. Its C-terminal SH2 domain binds autophosphorylated RTKs—including HER2 (pY1139), ErbB3, FAK (pY397), PDGFR, c-Kit, EphB1, and Ret—while its PH domain engages D3/D5-phosphoinositides required for FAK-mediated phosphorylation and full pro-migratory activity, and its N-terminal RA-PH region mediates calcium-dependent calmodulin binding that regulates membrane association and nuclear translocation [PMID:7907978, PMID:10446223, PMID:12021278, PMID:15806159]. At focal adhesions, FAK phosphorylates GRB7, enabling recruitment of SHC to activate RAS-ERK signaling and VAV2 to activate RAC1, thereby promoting integrin-dependent cell migration [PMID:10893408, PMID:23593540]. GRB7 also functions as an RNA-binding translational repressor that blocks eIF4E loading onto target mRNAs until FAK-mediated hyperphosphorylation relieves repression, and it is an integral stress granule component whose FAK-triggered dissociation drives stress granule disassembly [PMID:17318180, PMID:18273060]. GRB7 protein stability is negatively regulated by JNK phosphorylation at Ser194-Pro, which recruits Pin1 for proteasomal degradation, and in cancer GRB7 co-amplification with HER2 enhances HER2/AKT phosphorylation while also mediating MEK inhibitor resistance through interaction with PLK1 [PMID:27658202, PMID:22584052, PMID:34718347].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"The initial question—what signaling proteins associate with the oncogenic receptor HER2—was answered by identifying GRB7 as a major SH2 domain-containing binding partner of phosphorylated HER2 in breast cancer cells, establishing GRB7 as an RTK-coupled adaptor protein.\",\n      \"evidence\": \"Expression cloning with phosphorylated EGFR C-terminus as probe; reciprocal co-immunoprecipitation from SKBR-3 cells\",\n      \"pmids\": [\"7907978\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling consequences of GRB7-HER2 interaction unknown\", \"Whether GRB7 binds other RTKs not yet tested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"The question of whether GRB7 is a general RTK adaptor was resolved by demonstrating direct SH2-mediated binding to PDGFR (pY716/pY775), Ret, and SHPTP2, revealing broad receptor engagement rather than HER2 exclusivity.\",\n      \"evidence\": \"GST pulldown with autophosphorylated receptors; site-directed mutagenesis of receptor tyrosines; kinase-dead Ret mutant; co-immunoprecipitation\",\n      \"pmids\": [\"8940081\", \"8631863\", \"8622870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequences of these interactions not established\", \"No downstream effectors identified\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The structural basis for GRB7's preferential recognition of HER2 over other targets was clarified by mapping binding to pY1139 and identifying a single residue (Leu at βD6) in the SH2 domain as a key specificity determinant within the Grb7 family.\",\n      \"evidence\": \"Phosphopeptide competition and site-directed mutagenesis of SH2 domain\",\n      \"pmids\": [\"9079677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No three-dimensional structure yet available\", \"Binding affinities not quantified by biophysical methods\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"GRB7 receptor engagement was extended to heregulin-activated ErbB3/ErbB4, with pY1180 and pY1243 on ErbB3 identified as binding sites—establishing GRB7 as a pan-ErbB family adaptor also recruited by ErbB3 and ErbB4.\",\n      \"evidence\": \"Co-immunoprecipitation from breast cancer cells; ErbB3 point mutants; phosphopeptide competition; GST pulldown\",\n      \"pmids\": [\"9516479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream signaling from ErbB3/ErbB4-GRB7 complexes uncharacterized\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"The critical question of GRB7's cellular function was answered: GRB7 localizes to focal contacts via its SH2 domain, directly binds FAK at pY397, and overexpression enhances cell migration toward fibronectin while the isolated SH2 domain acts as a dominant negative—linking GRB7 to integrin-mediated cell migration.\",\n      \"evidence\": \"In vitro binding; co-immunoprecipitation; tetracycline-regulated expression; Boyden chamber migration assay; c-Kit pY936 mapping by mutagenesis\",\n      \"pmids\": [\"10446223\", \"10377264\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GRB7 phosphorylation sites not mapped\", \"Mechanism by which GRB7 promotes migration (effectors downstream) not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Several lines of evidence established that FAK directly phosphorylates GRB7 at focal contacts in a cell-adhesion-dependent manner, and that SH2-mediated focal contact targeting is indispensable for migration; additionally, phospho-caveolin-1 and the GTPase Rnd1 were identified as GRB7 binding partners.\",\n      \"evidence\": \"FAK−/− fibroblasts; chimeric molecules; phospho-specific antibodies; GST pulldown from SKBR3; yeast two-hybrid for Rnd1\",\n      \"pmids\": [\"10893408\", \"11075810\", \"10664463\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific phosphorylation sites on GRB7 not identified\", \"Rnd1 interaction functional consequence unknown\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"GRB7's PH domain was shown to bind phosphoinositides (D3/D5), and this lipid interaction was required not for focal contact recruitment but for FAK-mediated phosphorylation and full pro-migratory function—revealing a two-step activation model requiring both SH2-mediated recruitment and PH-mediated lipid engagement.\",\n      \"evidence\": \"In vitro lipid-binding assay; PI3K inhibitor; FAK−/− cells; PH domain deletion mutants; migration assay\",\n      \"pmids\": [\"12021278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific lipid species in vivo not determined\", \"No structure of PH domain available\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The SH2 domain inhibitor peptide G7-18NATE was discovered by phage display, selectively disrupting GRB7-ErbB interactions while sparing Grb2 and Grb14—establishing proof-of-concept for therapeutic targeting of GRB7.\",\n      \"evidence\": \"Phage display; competition binding assays; cell lysate immunoprecipitation inhibition\",\n      \"pmids\": [\"11809769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo efficacy not tested\", \"Cellular permeability and pharmacokinetics unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"NMR structure of the GRB7 SH2 domain in complex with ErbB2 pY1139 peptide provided atomic-level understanding of the binding mode, showing the phosphopeptide adopts a β-turn conformation.\",\n      \"evidence\": \"Solution NMR spectroscopy\",\n      \"pmids\": [\"12975581\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length GRB7 structure not available\", \"Autoinhibition mechanism not structurally characterized\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Calmodulin was identified as a calcium-dependent regulator of GRB7, binding to an amphiphilic helix at residues 243–256 in the RA-PH region; CaM competes with phosphoinositide binding and regulates GRB7 membrane association, adding a calcium-sensing layer to GRB7 signaling.\",\n      \"evidence\": \"CaM-affinity chromatography; FRET between EYFP-GRB7 and ECFP-CaM in living cells; deletion mutants; CaM inhibitory peptides\",\n      \"pmids\": [\"15806159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological conditions triggering CaM-GRB7 interaction in vivo not defined\", \"Effect on downstream signaling pathways unknown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"A fundamentally new function was discovered: GRB7 is an RNA-binding protein that represses translation by binding the 5′-UTR of KOR mRNA and blocking eIF4E recruitment; FAK-mediated hyperphosphorylation of two C-terminal tyrosines relieves repression—linking Netrin-1/FAK signaling to translational control through GRB7.\",\n      \"evidence\": \"RNA-binding assay; in vitro translation assay; FAK phosphorylation assay; domain deletion and mutagenesis\",\n      \"pmids\": [\"17318180\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full spectrum of GRB7-regulated mRNAs unknown\", \"Structural basis for RNA recognition not determined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Crystal structure of the GRB7 SH2 domain (2.1 Å) revealed dimerization at micromolar affinity, and showed G7-18NATE binds at the ligand-binding surface while disrupting the dimer interface—establishing dimerization as a regulatable property of GRB7.\",\n      \"evidence\": \"X-ray crystallography; analytical ultracentrifugation; ITC; NMR titration\",\n      \"pmids\": [\"17894853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biological significance of dimerization in signaling not established\", \"Full-length structure still unavailable\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"GRB7 was shown to be an integral component of stress granules, directly interacting with HuR and required for SG formation; FAK hyperphosphorylation upon stress termination dissociates GRB7 from HuR and drives SG disassembly—unifying GRB7's RNA-binding and FAK-regulated functions in the stress response.\",\n      \"evidence\": \"Co-immunoprecipitation; stress granule immunofluorescence; dominant-negative mutants; siRNA knockdown\",\n      \"pmids\": [\"18273060\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SG role is independent of translational repression unclear\", \"Phosphorylation sites mediating HuR release not mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"GRB7 was placed in an RTK-Ras-ERK signaling axis: EGF-induced GRB7 phosphorylation promotes RAS-GTP loading and ERK activation, and GRB7 overexpression enhances HER2 phosphorylation and AKT activation in breast cancer—establishing GRB7 as an amplifier of RTK signaling.\",\n      \"evidence\": \"Co-immunoprecipitation; RasGTP pulldown; siRNA knockdown; xenograft tumor model; phospho-signaling immunoblotting\",\n      \"pmids\": [\"20622016\", \"17916906\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which GRB7 enhances HER2 phosphorylation not established\", \"Whether GRB7 acts catalytically or as a scaffold unresolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"CaM was found to regulate GRB7 nuclear translocation through overlapping NLS and CaM-binding domains; CaM antagonism enhanced nuclear GRB7, while SH2 domain dimerization was quantified (KD ~11 μM) and a monomeric mutant (F511R) was engineered, establishing intramolecular and intermolecular regulatory mechanisms.\",\n      \"evidence\": \"Confocal microscopy with CaM antagonist W-7; deletion mutants; sedimentation equilibrium ultracentrifugation; ITC\",\n      \"pmids\": [\"22673522\", \"22811067\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nuclear function of GRB7 uncharacterized\", \"How autoinhibition and dimerization are coordinated unclear\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"A bifurcation model was established in HER2+ cells: GRB7 recruits SHC to activate RAS-ERK for proliferation, and separately, FAK-phosphorylated GRB7 recruits VAV2 to activate RAC1 for migration; CaM binding to GRB7 was shown to be required for normal cell migration and ECM attachment.\",\n      \"evidence\": \"Co-IP with RasGTP and Rac1-GTP pulldown after fibronectin stimulation; siRNA; CaM antagonists W-7/W-13 with deletion mutants; wound healing assay\",\n      \"pmids\": [\"23593540\", \"23743201\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct VAV2-GRB7 binding interface not mapped\", \"How CaM and FAK phosphorylation are coordinated not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A new negative regulatory mechanism was uncovered: JNK phosphorylates GRB7 at Ser194-Pro, enabling Pin1 WW domain binding and prolyl isomerization that targets GRB7 for proteasomal degradation, affecting G2-M progression.\",\n      \"evidence\": \"Co-immunoprecipitation; MG-132 proteasome inhibitor; Pin1 WW domain binding assay; JNK inhibitor; Ser194 mutagenesis; cell cycle analysis\",\n      \"pmids\": [\"27658202\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E3 ubiquitin ligase responsible not identified\", \"Physiological triggers of JNK-mediated GRB7 degradation unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Crystal structures of bicyclic peptide G7-B4 with the GRB7 SH2 domain, combined with SH2 domain microarray profiling across 79 domains, confirmed exquisite selectivity of the inhibitor scaffold and identified Arg462 and βD6-Leu as key specificity determinants.\",\n      \"evidence\": \"X-ray crystallography; SPR; SH2 domain microarray (79 domains); mutagenesis\",\n      \"pmids\": [\"27257138\", \"29083893\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No in vivo pharmacological data for optimized inhibitors\", \"Whether disrupting SH2 interactions is sufficient for anti-tumor effect in vivo unknown\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"An unbiased CRISPR screen revealed GRB7 as a driver of MEK inhibitor resistance in KRAS-mutant CRC; mass spectrometry identified PLK1 as the predominant GRB7-associated kinase, and combined PLK1 + MEK inhibition synergistically suppressed CRC growth—expanding GRB7 function into drug resistance and implicating PLK1 as a key effector.\",\n      \"evidence\": \"Genome-wide CRISPR/Cas9 screen; GRB7 IP-mass spectrometry; combination drug treatment in vitro and xenograft\",\n      \"pmids\": [\"34718347\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GRB7-PLK1 binding mode not characterized\", \"Whether PLK1 phosphorylates GRB7 not tested\", \"Mechanism linking GRB7-PLK1 to FAK/STAT3/AKT/4EBP1 not fully delineated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"GRB7 was shown to interact with Notch1 to activate Wnt/β-catenin and EMT in HER2+ breast cancer, and TCF12 was identified as a direct transcriptional activator of the GRB7 promoter—revealing upstream transcriptional regulation and a new downstream pathway.\",\n      \"evidence\": \"ChIP-PCR; luciferase reporter assay; co-immunoprecipitation; xenograft model; RNA sequencing\",\n      \"pmids\": [\"39113057\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect nature of GRB7-Notch1 interaction not established\", \"TCF12-GRB7 axis not validated in non-breast contexts\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the full-length GRB7 three-dimensional structure (needed to understand autoinhibition), the complete repertoire of GRB7-regulated mRNAs, the E3 ligase mediating Pin1-triggered degradation, the mechanism by which GRB7 enhances HER2 phosphorylation, and the nuclear functions of GRB7.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Full-length structure not determined\", \"Nuclear function not characterized\", \"Complete mRNA target repertoire unknown\", \"E3 ubiquitin ligase for GRB7 degradation not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 6, 9, 35]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [21, 23]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [21, 26]},\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [15]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9, 23]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [9, 15, 20]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [34]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [9, 37]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 6, 25, 26, 35]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [6, 9, 35]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [26, 33, 41]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ERBB2\", \"FAK\", \"SHC1\", \"VAV2\", \"ELAVL1\", \"CALM1\", \"FLNA\", \"PLK1\"],\n    \"other_free_text\": []\n  }\n}\n```"}