| 1992 |
GRB2 was identified as a 25 kDa protein containing one SH2 domain and two flanking SH3 domains. Its SH2 domain binds tyrosine-phosphorylated EGF and PDGF receptors, and microinjection of GRB2 together with H-Ras stimulated DNA synthesis in quiescent fibroblasts, establishing GRB2 as a link between receptor tyrosine kinases and Ras signaling. |
cDNA cloning, immunoblotting, microinjection assay |
Cell |
High |
1322798
|
| 1992 |
Tyrosine-phosphorylated Shc proteins form a specific complex with GRB2/Sem-5 via GRB2's SH2 domain, coupling tyrosine kinases to the Ras signaling pathway through a Shc-GRB2 complex. |
Co-immunoprecipitation, in vitro binding assays |
Nature |
High |
1465135
|
| 1993 |
The SH3 domains of GRB2 bind to the proline-rich carboxy-terminal tail of mSos1 (a Ras guanine nucleotide exchange factor). EGF stimulation induces binding of the GRB2-mSos1 complex to the autophosphorylated EGF receptor, thereby linking receptor tyrosine kinases to Ras activation. |
Co-immunoprecipitation, in vivo binding assays |
Nature |
High |
8479540 8479541 8493579
|
| 1993 |
GRB2 forms a stable complex with tyrosine-phosphorylated IRS-1 and Shc upon insulin stimulation, with the SH2 domain recognizing a YV/IN motif on these substrates. GRB2 overexpression enhanced ERK activation in an SH2- and SH3-dependent manner, and dominant-negative Ras blocked this effect, establishing GRB2 as the link between the insulin receptor and Ras/ERK signaling via IRS-1 and Shc. |
Co-immunoprecipitation, overexpression with SH2/SH3 point mutants, dominant-negative Ras epistasis |
The EMBO journal / Science |
High |
8316835 8491186
|
| 1994 |
GRB2 directly binds the EGF receptor via its SH2 domain at phosphotyrosine Y1068 (primary site) and Y1086 (minor site), while Y1173 is an indirect binding site mediated through Shc. Dissociation constants were measured by BIAcore real-time interaction analysis. |
Co-immunoprecipitation with EGFR point mutants, phosphopeptide competition, dephosphorylation protection assay, BIAcore affinity measurements |
Molecular and cellular biology |
High |
7518560
|
| 1994 |
GRB2's SH2 domain binds phosphotyrosine with the optimal recognition motif pTyr-X-N-X (hydrophilic-hydrophilic-hydrophobic), distinct from other SH2 domains, as determined by degenerate phosphopeptide library screening. |
Degenerate phosphopeptide library, peptide binding assays |
Molecular and cellular biology |
High |
7511210
|
| 1994 |
Fibronectin-mediated integrin engagement promotes GRB2 SH2-domain binding to FAK phosphorylated at Tyr925 (YENV motif), linking integrins to the Ras/MAPK pathway. Mutation of Tyr925 to phenylalanine blocks GRB2 SH2 binding to FAK in vitro. |
Co-immunoprecipitation in vivo, in vitro SH2 binding with FAK mutants, MAPK activation assay |
Nature |
High |
7997267
|
| 1994 |
GRB2 does not bind the PDGF receptor directly; instead, upon PDGF stimulation, GRB2 binds the tyrosine-phosphorylated phosphatase Syp/SHPTP2 (a ~70 kDa protein) which is recruited to the PDGF receptor at Tyr1009. Syp thus acts as an adaptor linking the PDGF receptor to the GRB2-Sos complex. |
Co-immunoprecipitation, PDGF receptor tyrosine mutants, direct binding assays with GST fusions |
Molecular and cellular biology |
High |
8264620
|
| 1994 |
GRB2 and Sos1 form a constitutive complex; M-CSF stimulation of Fms receptor leads to Fms association with GRB2 and Sos1 through Shc or the myeloid-specific p150 protein, providing a mechanism for Ras activation downstream of Fms in myeloid cells. |
Co-immunoprecipitation, Fms SH2 domain binding |
Molecular and cellular biology |
Medium |
7520523
|
| 1994 |
A GRB2 isoform lacking functional SH2 domain (Grb3-3) retains functional SH3 domains, cannot bind phosphorylated EGFR, inhibits EGF-induced Ras signaling as a dominant negative, and induces apoptosis upon microinjection into fibroblasts. |
cDNA cloning, reporter gene assay, microinjection-induced apoptosis |
Science |
Medium |
8178156
|
| 1994 |
EGF stimulation in rat liver parenchyma leads to rapid compartmentalization of SHC, GRB2, and mSOS predominantly in endosomes, where the tyrosine-phosphorylated SHC-GRB2-mSOS complex forms and drives sustained Raf-1 activation. Insulin stimulation does not trigger this pathway in the same cells. |
Subcellular fractionation in vivo, co-immunoprecipitation, Raf-1 gel-shift assay |
The EMBO journal |
Medium |
7925272
|
| 1995 |
GRB2 directly interacts with beta-dystroglycan via SH3 domain binding to beta-dystroglycan's C-terminal proline-rich domains. Loss-of-function GRB2 mutants (P49L and G203R) in SH3 domains abolish this interaction, and endogenous GRB2 co-immunoprecipitates with alpha/beta-dystroglycan in skeletal muscle and brain. |
In vitro protein binding, affinity chromatography, co-immunoprecipitation with SH3 domain mutants |
The Journal of biological chemistry |
Medium |
7744812
|
| 1995 |
GRB2 directly associates with p85 (the regulatory subunit of PI3-kinase) via SH3 domain interactions with p85 proline-rich motifs. This interaction occurs constitutively, is independent of growth factor stimulation, and is exclusive of Sos binding, suggesting that GRB2 can route signaling to PI3-kinase independently of Ras. |
Yeast two-hybrid, GST pulldown reconstitution, peptide competition |
The Journal of biological chemistry |
Medium |
7759531
|
| 1995 |
Cbl is co-immunoprecipitated with GRB2 in unstimulated Jurkat T cells via GRB2's N-terminal SH3 domain. Upon TCR activation, Cbl undergoes tyrosine phosphorylation and shifts binding to GRB2's SH2 domain, while losing constitutive SH3-mediated binding. The Cbl-GRB2 complex is distinct from the Sos-GRB2 complex. |
Co-immunoprecipitation, GST fusion binding assays, T cell activation |
Molecular and cellular biology |
Medium |
7791764
|
| 1996 |
ERK (but not JNK) pathway activation is responsible for feedback serine/threonine phosphorylation of SOS and dissociation of the GRB2-SOS complex. Plasma membrane targeting of GRB2-SOS (via EGFR) prevents this feedback uncoupling, whereas a GRB2 SH2 mutant unable to associate with the membrane fails to protect the GRB2-SOS complex. |
Kinase activation assays with specific inhibitors (PD98059), dominant-interfering Ras, membrane-anchored GRB2 fusion proteins, SH2 mutants |
The Journal of biological chemistry |
High |
8626428 8626525
|
| 1996 |
GRB2 SH3 domain mediates constitutive interaction with Gab1 at two sites: a classical PXXP motif and a novel PX(V/I)(D/N)RXXKP motif. GRB2 bridges Gab1 to c-Met-signaling complexes; the Gab1-GRB2 interaction couples c-Met activation to downstream branching morphogenesis via Shp2. |
Reverse yeast two-hybrid domain mapping, modified yeast two-hybrid for phosphorylation-dependent interactions, MDCK branching morphogenesis assay |
The Journal of cell biology |
Medium |
10871282
|
| 1997 |
FRS2, a lipid-anchored (myristylated) docking protein, is tyrosine phosphorylated upon FGF or NGF stimulation and recruits the GRB2/Sos complex to the plasma membrane. Myristylation is essential for FRS2 membrane localization, tyrosine phosphorylation, GRB2/Sos recruitment, and MAPK activation, linking FGF/NGF receptors to the Ras/MAPK pathway. |
Protein purification, cDNA cloning, co-immunoprecipitation, myristylation mutants, MAPK activation assay |
Cell |
High |
9182757
|
| 1998 |
GRB2 is genetically required for endoderm differentiation and epiblast formation during mouse embryogenesis. A Sos1 fusion protein with GRB2's SH2 domain rescues Grb2-null defects, providing genetic evidence that GRB2 functions as an adaptor (not an enzyme) coupling SH2 phosphotyrosine binding to SH3-mediated Sos1 activation in a mammalian Ras signaling pathway. |
Mouse gene knockout, embryonic stem cell analysis, chimera analysis, rescue with SH2-Sos1 fusion protein |
Cell |
High |
9865697
|
| 1998 |
GRB2 binds the Ret tyrosine kinase long isoform (Ret/ptc2) at phosphotyrosine Y620 (corresponding to Y1096 on proto-Ret). Mutation of Y620 to F reduces GRB2 co-immunoprecipitation and significantly diminishes transforming activity, demonstrating that GRB2 binding to Ret is required for efficient transformation. |
Phosphopeptide inhibition, site-directed mutagenesis, co-immunoprecipitation, transformation assay |
Oncogene |
Medium |
9764818
|
| 2000 |
Activated EGFR-CFP interacts with GRB2-YFP in membrane ruffles and endosomes as measured by FRET microscopy in living cells, directly demonstrating that EGFR-GRB2 signaling complexes persist in the endosomal compartment. |
Live-cell FRET microscopy (CFP/YFP fusion proteins) |
Current biology |
High |
11084343
|
| 2001 |
Grb2 null mutation in mice causes embryonic lethality due to failure of endoderm differentiation. A hypomorphic SH2 mutation (E89K) in mouse Grb2 causes defects in placental morphogenesis, neural crest survival, and palate formation, with marked reduction in ERK/MAPK activation and Gab1 tyrosine phosphorylation in fibroblasts, establishing dose-dependent and SH2-mediated functions for GRB2 in tissue morphogenesis. |
Allelic series mouse genetics, compound heterozygote analysis, ERK activation assay, Gab1 phosphorylation |
Current biology |
High |
11369229
|
| 2001 |
NMR and small-angle X-ray scattering reveal that GRB2 is a flexible protein in solution, with the C-terminal SH3 domain connected to the SH2 domain via a flexible linker, contrasting with the compact crystal structure. GRB2 adapts the relative position and orientation of both SH3 domains to bind bivalently to proline-rich target sequences. |
Solution NMR, small-angle X-ray scattering, peptide binding experiments |
Journal of molecular biology |
High |
11178911
|
| 2001 |
GRB2 haploinsufficiency (Grb2+/- mice) selectively impairs TCR-induced JNK and p38 (but not ERK) activation in thymocytes, leading to defective negative but not positive selection. This establishes GRB2 as a quantitative regulator of MAPK pathway selection in T cell development. |
Grb2 heterozygous mouse model, kinase activation assays, thymic selection analysis |
Nature immunology |
High |
11135575
|
| 2002 |
H. pylori CagA protein binds GRB2 in vitro and in vivo in a phosphorylation-independent manner via its EPIYA (PY) region, activating the Ras/MEK/ERK pathway and inducing cell scattering and proliferation. |
Co-immunoprecipitation in vivo and in vitro, ERK activation assay, cell morphology and proliferation assays |
Molecular cell |
Medium |
12419219
|
| 2002 |
GRB2 and Ras traffic together to endosomes upon EGF stimulation. GTP-bound (active) Ras is localized at the plasma membrane (ruffles/cell edges) and in endosomes containing EGFR, as measured by FRET between CFP-Ras and YFP-Raf-RBD, demonstrating that endosomes are sites of active Ras signaling. |
Live-cell fluorescence imaging, FRET microscopy with fluorescent fusion proteins |
Molecular biology of the cell |
High |
12006650
|
| 2002 |
GRB2 SH3 domains are required for macropinocytic internalization of EGFR. GRB2-YFP rapidly redistributes from cytoplasm to plasma membrane after EGF stimulation in an SH2-dependent manner; the SH3 domains then couple EGFR-containing membranes to effectors required for clathrin-independent macropinocytic internalization. |
Live-cell imaging with GFP-tagged GRB2 SH2/SH3 domain mutants, transferrin uptake assay, AP-180 C-terminus inhibition |
Journal of cell science |
Medium |
11956311
|
| 2003 |
GRB2 haploinsufficiency in mice inhibits cardiac p38 MAPK and JNK activation and blocks pressure overload-induced cardiac hypertrophy and fibrosis. This establishes GRB2 as required upstream of p38/JNK signaling in the mechanosensing pathway driving cardiac hypertrophy. |
Grb2+/- mouse model, pressure overload surgery, MAPK activation assays, histology |
The Journal of clinical investigation |
High |
12639989
|
| 2003 |
p27Kip1 (CDKN1B) binds GRB2 in the cytoplasm upon mitogen stimulation and blocks GRB2 association with SOS. Cells lacking p27 maintain GRB2-SOS complexes for longer after mitogen stimulation, and p27 inhibits Ras activation by targeting GRB2, a function separable from its CDK inhibitory activity. |
Yeast two-hybrid, co-immunoprecipitation, mitogen stimulation time-courses, transient transfection Ras activation assay |
Molecular and cellular biology |
Medium |
12748278
|
| 2006 |
In the absence of Grb2, all inner cell mass (ICM) cells at E3.5 express Nanog and lack Gata6, demonstrating that Grb2-Ras-MAPK signaling is required for Gata6 expression and the specification of primitive endoderm (PE) progenitors in the early mouse embryo. |
Grb2-null mouse embryo analysis, immunofluorescence for Nanog/Gata6, lineage tracing |
Developmental cell |
High |
16678776
|
| 2006 |
The GRB2/MEK pathway represses Nanog transcription in embryonic stem cells. Grb2 deficiency or MEK inhibitor PD98059 abolishes sodium vanadate-induced Nanog repression and primitive endoderm differentiation; a constitutively active MEK mutant induces Nanog repression, placing GRB2 upstream of MEK in controlling ES cell pluripotency. |
Grb2-deficient ES cells, MEK inhibitor, constitutively active MEK transfection, reporter gene assays |
Molecular and cellular biology |
High |
16908534
|
| 2007 |
GRB2 is required for clathrin-dependent endocytosis of cMet. siRNA depletion of GRB2, dominant-negative GRB2, or point mutations blocking GRB2 binding to the cMet multisubstrate docking site all impair cMet internalization. A GRB2-Cbl chimera rescues internalization in GRB2-depleted cells, indicating GRB2 recruits Cbl ubiquitin ligase activity to cMet for endocytosis. |
siRNA knockdown, dominant-negative overexpression, cMet point mutants, rescue with Cbl-GRB2 chimera, endocytosis assays |
The Journal of biological chemistry |
High |
17449471
|
| 2007 |
The Grb2-SH2 domain forms a domain-swapped dimer with 4- to 13-fold reduced affinity for a Shc-derived phosphopeptide compared to monomer. Crystal structures reveal that residues V122, V123, and R142 influence W121 conformation, which governs ligand specificity. |
Isothermal titration calorimetry, X-ray crystallography, NMR |
Archives of biochemistry and biophysics |
High |
17466257
|
| 2009 |
GRB2 recruits to FGFR2 through a phosphorylation-independent interaction between GRB2's C-terminal SH3 domain and the proline-rich C-terminus of FGFR2. Deletion of the last 10 amino acids of FGFR2 abrogates GRB2 binding, and this interaction provides resistance to Shp2-mediated receptor dephosphorylation. |
Domain deletion mutants, synthetic peptide binding (affinity measurements), FLIM-FRET, Shp2 dephosphorylation assay |
Cellular signalling |
Medium |
19735729
|
| 2009 |
Gasp (Themis) constitutively associates with GRB2 via GRB2's N-terminal SH3 domain in DP thymocytes. Loss of Gasp severely impairs positive selection of both CD4 and CD8 T cells, suggesting GRB2-Gasp acts as a thymocyte-specific adaptor complex in Ras signaling during positive selection. |
Co-immunoprecipitation, knockout mouse phenotypic analysis, flow cytometry |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
19805304
|
| 2010 |
GRB2 localizes specifically to degradative structures (podosomes) in Src-transformed fibroblasts and PMA-stimulated endothelial cells, but not to invadopodia in metastatic mammary carcinoma cells, distinguishing these two types of actin-rich structures by their upstream N-WASp/WASp activators. |
Immunofluorescence localization in multiple cell types, comparison of GRB2 vs. Nck1 distribution |
European journal of cell biology |
Medium |
20850195
|
| 2011 |
GRB2 forms a heterotrimer with PLD2 and WASp, with GRB2 bridging PLD2 (via SH2 domain binding to PLD2 Y169) and WASp (via SH3 domains binding WASp poly-proline region). This PLD2-GRB2-WASp complex localizes to phagocytic cups and is required for actin polymerization and phagocytosis in macrophages. |
Co-immunoprecipitation, PLD2 and GRB2 mutants, RNAi knockdown, phagocytosis assay, immunofluorescence |
Molecular and cellular biology |
Medium |
21930784
|
| 2012 |
Dimeric GRB2 binds to the C-termini of two FGFR2 molecules, forming a heterotetramer. This complex allows low-level transphosphorylation but sterically blocks C-terminal phosphorylation and recruitment of downstream signaling proteins. Upon FGFR2 stimulation, FGFR2 phosphorylates tyrosine residues on GRB2, promoting dissociation and enabling full downstream signaling. GRB2 thus acts as a negative regulator of basal FGFR2 activity. |
Biochemical reconstitution, structural analysis, mass spectrometry, receptor phosphorylation assays, mutagenesis |
Cell |
High |
22726438
|
| 2012 |
TIGIT/PVR engagement leads to phosphorylation of Tyr225 in TIGIT's ITT-like motif, which recruits GRB2 via its SH2 domain. GRB2 in turn recruits SHIP1, which terminates PI3K and MAPK signaling and suppresses NK cell granule polarization and cytotoxicity. Tyr225 or Asn227 mutation restores cytotoxicity, and SHIP1 silencing abolishes TIGIT-mediated killing inhibition. |
Mutagenesis of TIGIT ITT-like motif, co-immunoprecipitation, SHIP1 siRNA knockdown, NK cell cytotoxicity assay |
Cell death and differentiation |
High |
23154388
|
| 2013 |
Live-cell quantitative imaging reveals an average of two GRB2-YFP molecules co-localized per EGF-receptor in endosomes. GRB2 association with EGFR persists in endosomes during trafficking and correlates with sustained ERK1/2 activation, supporting endosomal EGFR signaling as a significant contributor to this pathway. |
Quantitative spinning disk confocal microscopy, endogenous GRB2 replacement with GRB2-YFP, single-endosome quantification |
Journal of cell science |
Medium |
24259669
|
| 2014 |
In the absence of ligand stimulation, GRB2 C-terminal SH3 domain competes with PLCγ1 SH3 domain for a proline-rich site at the FGFR2 C-terminus. Reduction in GRB2 concentration permits constitutive PLCγ1 recruitment, upregulating phospholipase activity, PIP2 turnover, calcium levels, and cell invasiveness independently of receptor stimulation. |
In vitro competition binding assays, PLCγ1 activity measurements, calcium imaging, invasion assays in low-GRB2 cancer cells |
Nature structural & molecular biology |
High |
24440983
|
| 2014 |
GRB2 is SUMOylated by SUMO1 at lysine K56 (in the linker between N-SH3 and SH2 domains). SUMOylation at K56 enhances formation of the GRB2-Sos1 complex, increasing Ras/MEK/ERK activation. GRB2-K56R mutant cannot rescue ERK activity, cell motility, or tumorigenesis in GRB2 knockdown cells. |
In vivo SUMOylation assay (Ni2+-NTA pulldown), in vitro E. coli-based SUMOylation assay, co-immunoprecipitation, GRB2 knockdown/re-expression, xenograft tumor model |
Molecular cancer |
Medium |
24775912
|
| 2014 |
GRB2 promotes ARF1 and ARF6 activation downstream of EGFR in breast cancer cells. GRB2 is required for recruitment of ARF1 to the EGFR. Conversely, p66Shc blocks GRB2-mediated ARF1 recruitment and ARF1 activation. GRB2 is also required for ARF6 activation and receptor recruitment. |
Co-immunoprecipitation, GTPase activation assays, siRNA knockdown, EGF stimulation |
The Journal of biological chemistry |
Medium |
24407288
|
| 2014 |
EGF-stimulated EGFR clusters (containing on average 4 EGFR molecules) preferentially recruit GRB2. Modeling indicates that ~94% of EGFR tetramers are associated with GRB2, while monomers and dimers show much less GRB2 association, implicating EGFR tetramers as the predominant GRB2-binding signaling unit. |
Image correlation spectroscopy, FLIM-FRET, quantitative modeling |
Biochemistry |
Medium |
24697349
|
| 2019 |
PSMD14, a deubiquitinating enzyme, directly stabilizes GRB2 protein by inhibiting its ubiquitin-mediated proteasomal degradation. PSMD14 knockdown reduces GRB2 protein levels, and pharmacological PSMD14 inhibition suppresses GRB2-dependent HCC malignant behaviors in vitro and in vivo. |
Co-immunoprecipitation, knockdown/overexpression experiments, ubiquitination assay, in vitro and in vivo tumor models |
Cancer letters |
Medium |
31634528
|
| 2019 |
GRB2 binds PTEN and is required for PTEN's nuclear translocation upon oxidative stress. Loss of GRB2 reduces nuclear PTEN, decreasing RAD51 expression and leading to micronuclei formation, indicating GRB2 is required for genome stability in the DNA damage response via a PTEN-RAD51 axis. |
Co-immunoprecipitation, GRB2 knockdown/overexpression, nuclear fractionation, PTEN mutant rescue, micronuclei counting |
Cell death & disease |
Medium |
31320611
|
| 2021 |
GRB2 displays intramolecular allostery: phosphotyrosine peptide (HER2 pY) binding to the SH2 domain potentiates GRB2 SH3 domain interactions with SOS1. The SH2 domain blocks the C-terminal SH3 domain (cSH3), enabling nSH3 to bind SOS1 first before cSH3 follows. This allosteric mechanism is unidirectional between cSH3 and other domains. |
NMR, fluorescence polarization, analytical ultracentrifugation, pull-down assays with domain mutants |
The Biochemical journal |
High |
34232285
|
| 2022 |
BCR-ABL recruits GRB2 via the pBCR 176FpYVNV180 motif binding specifically to GRB2's SH2 domain. The specificity pocket in SH2-GRB2 is governed by N179 in pBCR and W121 in SH2-GRB2. The optimal binding motif for SH2-GRB2 is E/D-pY-E/V-N-I/L. |
Computational modeling of pBCR-SH2GRB2 complexes, comparison of multiple pY-peptide-SH2 complexes |
Biophysical journal |
Low |
35651316
|
| 2023 |
RNF173 (a MARCH family E3 ubiquitin ligase) ubiquitinates GRB2, promoting its degradation and suppressing RAF/MEK/ERK signaling in hepatocellular carcinoma. RNF173 knockdown impairs GRB2 ubiquitination and degradation, leading to RAF/MEK/ERK pathway activation and enhanced invasion/metastasis. |
RNA sequencing, mass spectrometry, co-immunoprecipitation, ubiquitination assay, RNF173 knockdown/overexpression, in vitro and in vivo tumor models |
Cell communication and signaling |
Medium |
37626338
|
| 2024 |
Nuclear GRB2 protects stalled replication forks from MRE11-mediated degradation by binding RAD51 and inhibiting its ATPase activity, stabilizing RAD51 on stalled forks. GRB2 depletion causes DNA fragments to enter the cytoplasm and activate the cGAS-STING innate immune pathway, triggering pro-inflammatory cytokine production. In a syngeneic ovarian cancer model, GRB2 depletion combined with PARP inhibition reduced tumor burden and enabled high survival. |
RAD51 ATPase assay, replication fork protection assay (fiber assay), co-immunoprecipitation, cGAS-STING activation measurement, syngeneic mouse cancer model |
Nature communications |
High |
38459011
|