GRB2 — Growth Factor Receptor Bound Protein 2
Pathway Diagram ```mermaid
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GRB2 — Growth Factor Receptor Bound Protein 2
Pathway Diagram
Mermaid diagram (expand to render)
<table class="infobox infobox-gene">
GRB2 (Growth Factor Receptor Bound Protein 2)
Introduction GRB2 (Growth Factor Receptor Bound Protein 2) is a critical adaptor protein that links receptor tyrosine kinases to downstream signaling pathways[@schlessinger2000][@margolis1992]. This page provides detailed information about its structure, function, and role in neurodegeneration.
Overview GRB2 is an adaptor protein encoded by the GRB2 gene on chromosome 17q25.1. It contains one SH2 domain flanked by two SH3 domains, allowing it to link activated receptor tyrosine kinases (RTKs) to the RAS/MAPK and PI3K/AKT signaling cascades[^3]. GRB2 is essential for cellular proliferation, differentiation, survival, and synaptic plasticity.
Function
Signal Transduction GRB2 serves as a molecular adaptor:
SH2 domain binds to phosphorylated tyrosine residues on activated RTKs (e.g., EGFR, Trk receptors)SH3 domains bind to proline-rich motifs in downstream effectors (e.g., SOS, GAB1)This linking activates RAS/MAPK and PI3K/AKT pathways
Synaptic Plasticity GRB2 is involved in:
[NMDA receptor](/entities/nmda-receptor) signaling
AMPA receptor trafficking
Dendritic spine formation
[Long-term potentiation](/mechanisms/long-term-potentiation) (LTP)
Neurotrophin Signaling GRB2 binds to activated Trk receptors (TrkA, TrkB, TrkC) linking NGF, BDNF, and NT-3 signaling to neuronal survival pathways.
Disease Associations
Alzheimer's Disease
GRB2 interacts with APP and regulates [amyloid precursor protein](/entities/app-protein) processing
Altered GRB2 expression in AD brain
Role in [tau](/proteins/tau) phosphorylation via RAS/RAF/ERK pathway
GRB2 polymorphisms associated with AD risk
Parkinson's Disease
GRB2 involved in dopaminergic neuron survival
Links LRRK2 signaling to downstream pathways
Altered in PD models
ALS
GRB2 in motor neuron survival signaling
Links to neurotrophin receptors
Altered in ALS models
Cancer GRB2 is frequently amplified or overexpressed in cancers:
Breast cancer
Lung cancer
Colon cancer
Driver mutation in some tumors
Expression Pattern GRB2 is ubiquitously expressed:
Neurons ([cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia)
Glial cells ([astrocytes](/entities/astrocytes), microglia)
All peripheral tissues
High expression in developing brain
Therapeutic Implications
Drug Targets
GRB2-SH2 domain inhibitors in development
Targeting RTK-GRB2 interaction for cancer therapy
Neurological Applications
Modulating GRB2 signaling for neuroprotection
BDNF/TrkB-GRB2 pathway in AD/PD therapy
Key Publications
[Schlessinger (2000) - Cell signaling by receptor tyrosine kinases](https://doi.org/10.1016/S0092-8674(00)00121-6)
[Margolis et al. (1992) - GRB2 structure](https://pubmed.ncbi.nlm.nih.gov/1314964/)
[Guo & Wang (2022) - GRB2 in neurodegeneration](https://pubmed.ncbi.nlm.nih.gov/35658640/)
Cross-References
[RAS/MAPK signaling pathway](/mechanisms/ras-mapk-pathway)
[PI3K/AKT signaling pathway](/mechanisms/pi3k-akt-pathway)
[Trk receptors](/genes/ntrk1)
[BDNF gene](/genes/bdnf)
[EGFR gene](/genes/egfr)
[Alzheimer's disease signaling](/diseases/alzheimers-disease)
[Parkinson's disease mechanisms](/diseases/parkinsons-disease)
See Also
[RAS/MAPK signaling pathway](/mechanisms/ras-mapk-pathway)
[PI3K/AKT signaling pathway](/mechanisms/pi3k-akt-pathway)
[Alzheimer's disease signaling](/diseases/alzheimers-disease)
[Parkinson's disease mechanisms](/diseases/parkinsons-disease)
External Links
[Ensembl: ENSG00000177885](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000177885)
References
[Unknown, Schlessinger. Cell signaling by receptor tyrosine kinases (2000)](https://doi.org/10.1016/S0092-8674(00)
[Margolis et al. The SH2 and SH3 domains of the growth factor receptor-bound protein 2 (GRB2) are selectively mutated in the mammalian cell transformation. Oncogene . 1992;7(11):2219-2228, PubMed:1314964 (1992)](https://pubmed.ncbi.nlm.nih.gov/1314964/)
Pathway Diagram The following diagram shows the key molecular relationships involving GRB2 — Growth Factor Receptor Bound Protein 2 discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)
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