Growth factor receptor-bound protein 2, also known as Grb2, is an adaptor protein involved in signal transduction/cell communication. In humans, the GRB2 protein is encoded by the GRB2 gene.^[5][6]

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GRB2
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1AZE, 1BM2, 1BMB, 1CJ1, 1FHS, 1FYR, 1GCQ, 1GFC, 1GFD, 1GHU, 1GRI, 1IO6, 1JYQ, 1JYR, 1JYU, 1QG1, 1TZE, 1X0N, 1ZFP, 2AOA, 2AOB, 2H5K, 2HUW, 2VVK, 2VWF, 2W0Z, 3C7I, 3IMD, 3IMJ, 3IN7, 3IN8, 3KFJ, 3MXC, 3MXY, 3N7Y, 3N84, 3N8M, 3OV1, 3OVE, 3S8L, 3S8N, 3S8O, 2H46, 3WA4, 4P9V, 4P9Z, 5CDW
Identifiers
Aliases	GRB2, ASH, EGFRBP-Grb3-3, MST084, MSTP084, NCKAP2, growth factor receptor bound protein 2
External IDs	OMIM: 108355 MGI: 95805 HomoloGene: 1576 GeneCards: GRB2
Gene location (Human) Chr. Chromosome 17 (human)[1] Band 17q25.1 Start 75,318,076 bp[1] End 75,405,709 bp[1]
Gene location (Mouse) Chr. Chromosome 11 (mouse)[2] Band 11 E2|11 80.91 cM Start 115,534,871 bp[2] End 115,599,423 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in monocyte blood superficial temporal artery lymph node lower lobe of lung ganglionic eminence spleen thymus prefrontal cortex stromal cell of endometrium Top expressed in superior frontal gyrus cerebellar cortex blood lip thymus dorsomedial hypothalamic nucleus piriform cortex yolk sac morula entorhinal cortex More reference expression data BioGPS More reference expression data
Gene ontology Molecular function protein domain specific binding SH3 domain binding protein kinase binding identical protein binding neurotrophin TRKA receptor binding protein phosphatase binding protein binding ephrin receptor binding insulin receptor substrate binding epidermal growth factor receptor binding phosphatidylinositol-4,5-bisphosphate 3-kinase activity 1-phosphatidylinositol-3-kinase activity phosphoprotein binding enzyme binding RNA binding non-membrane spanning protein tyrosine kinase activity phosphotyrosine residue binding Cellular component extracellular exosome nucleolus cytoplasm nucleoplasm COP9 signalosome Golgi apparatus cytosol nucleus cell-cell junction membrane Grb2-EGFR complex endosome vesicle membrane plasma membrane extrinsic component of cytoplasmic side of plasma membrane protein-containing complex intracellular anatomical structure Biological process T cell costimulation Fc-gamma receptor signaling pathway involved in phagocytosis branching involved in labyrinthine layer morphogenesis MAPK cascade epidermal growth factor receptor signaling pathway fibroblast growth factor receptor signaling pathway insulin receptor signaling pathway receptor internalization cell-cell signaling axon guidance positive regulation of reactive oxygen species metabolic process cellular response to ionizing radiation Fc-epsilon receptor signaling pathway viral process positive regulation of actin filament polymerization signal transduction in response to DNA damage negative regulation of epidermal growth factor receptor signaling pathway leukocyte migration regulation of MAPK cascade anatomical structure formation involved in morphogenesis human ageing ERBB2 signaling pathway phosphatidylinositol phosphate biosynthetic process phosphatidylinositol-3-phosphate biosynthetic process protein heterooligomerization entry of bacterium into host cell membrane organization cell migration cell differentiation peptidyl-tyrosine autophosphorylation regulation of cell population proliferation innate immune response Ras protein signal transduction interleukin-15-mediated signaling pathway positive regulation of protein kinase B signaling regulation of molecular function cytokine-mediated signaling pathway positive regulation of Ras protein signal transduction neurotrophin TRK receptor signaling pathway Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 2885 14784 Ensembl ENSG00000177885 ENSMUSG00000059923 UniProt P62993 Q60631 RefSeq (mRNA) NM_203506 NM_002086 NM_008163 NM_001313936 NM_001313937 RefSeq (protein) NP_002077 NP_987102 NP_001300865 NP_001300866 NP_032189 Location (UCSC) Chr 17: 75.32 – 75.41 Mb Chr 11: 115.53 – 115.6 Mb PubMed search [3] [4]
Wikidata
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The protein encoded by this gene binds receptors such as the epidermal growth factor receptor and contains one SH2 domain and two SH3 domains. Its two SH3 domains direct complex formation with proline-rich regions of other proteins, and its SH2 domain binds tyrosine phosphorylated sequences. This gene is similar to the sem-5 gene of Caenorhabditis elegans, which is involved in the signal transduction pathway. Two alternatively spliced transcript variants encoding different isoforms have been found for this gene.^[7]

Grb2 is widely expressed and is essential for multiple cellular functions. Inhibition of Grb2 function impairs developmental processes in various organisms and blocks transformation and proliferation of various cell types. It is thus not surprising that targeted gene disruption of Grb2 in mice is lethal at an early embryonic stage. Grb2 is best known for its ability to link the epidermal growth factor receptor tyrosine kinase to the activation of Ras and its downstream kinases, ERK1,2. Grb2 is composed of an SH2 domain flanked on each side by an SH3 domain. Grb2 has two closely related proteins with similar domain organizations, Gads and Grap. Gads and Grap are expressed specifically in hematopoietic cells and function in the coordination of tyrosine kinase mediated signal transduction.

The SH2 domain of Grb2 binds to phosphorylated tyrosine-containing peptides on receptors or scaffold proteins with a preference for pY-X-N-X, where X is generally a hydrophobic residue such as valine (see ).

The N-terminal SH3 domain binds to proline-rich peptides and can bind to the Ras-guanine exchange factor SOS.

The C-terminal SH3 domain binds to peptides conforming to a P-X-I/L/V/-D/N-R-X-X-K-P motif that allows it to specifically bind to proteins such as Gab-1.^[8]

Grb2 has been shown to interact with:

• MAPK/ERK pathway