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Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification (BiCAP)
Published on: June 15, 2018
ErbB-1 and ErbB-2 acquire distinct signaling properties dependent upon their dimerization partner
M A Olayioye1, D Graus-Porta, R R Beerli
1Friedrich Miescher Institute, CH-4002 Basel, Switzerland.
Molecular and Cellular Biology
|August 26, 1998
Summary
Epidermal growth factor (EGF) receptor (ErbB) dimerization dictates distinct intracellular signaling pathways, influencing cell responses. Receptor phosphorylation patterns vary based on dimerization partners, explaining diverse signaling outcomes.
Area of Science:
- Cellular signaling pathways
- Receptor tyrosine kinases
- Molecular biology
Background:
- Epidermal growth factor (EGF)-related peptides activate distinct ErbB receptor dimers.
- Dimerization leads to varied intracellular signaling networks and biological responses.
Purpose of the Study:
- To investigate dimerization-dependent modulation of ErbB receptor signaling.
- To compare signaling of ErbB-1 activated by EGF versus Neu differentiation factor (NDF).
- To analyze ErbB-2 signaling properties based on dimerization mode.
Main Methods:
- Constructed NIH 3T3 cell lines expressing ErbB-1 and ErbB-2 singly and in combinations.
- Compared EGF-activated ErbB-1 with NDF-activated ErbB-1/ErbB-4 heterodimers.
- Analyzed ErbB-2 homodimerization and heterodimerization.
- Utilized tryptic phosphopeptide mapping to assess receptor phosphorylation.
Main Results:
- ErbB-1 coupled to Shc with both EGF and NDF; interacted with Grb2 only upon EGF activation.
- EGF-activated ErbB-1 showed rapid internalization; NDF-activated ErbB-1 exhibited delayed internalization.
- Phosphatidylinositol 3-kinase (PI3-K) association with ErbB-1 was biphasic with EGF and monophasic with ErbB-4.
- ErbB-2 binding to signaling molecules varied with dimerization mode.
- Receptor phosphorylation patterns differed based on dimerization partners.
Conclusions:
- Receptor dimerization is a critical determinant of specific intracellular signaling events.
- Differential phosphorylation of ErbB receptors, dependent on dimerization partners, underlies distinct signaling outcomes.
- This study provides insights into the complexity of ErbB receptor signaling networks.
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