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A quantitative protein interaction network for the ErbB receptors using protein microarrays
Richard B Jones1, Andrew Gordus, Jordan A Krall
1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
Nature
|November 8, 2005
Summary
This study maps protein interactions with ErbB receptors, revealing new connections and how receptor promiscuity in cancer may relate to protein concentration. It offers a quantitative view of signaling networks.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- Epidermal growth factor receptor (EGFR) signaling is crucial but its initial protein recruitment steps are not fully understood.
- A genome-wide view of early signaling events in the ErbB pathway is lacking.
Purpose of the Study:
- To create a quantitative protein interaction network for the four ErbB receptors.
- To investigate the earliest step in ErbB signaling: protein recruitment to activated receptors.
Main Methods:
- Utilized protein microarrays containing human Src homology 2 (SH2) and phosphotyrosine binding (PTB) domains.
- Measured equilibrium dissociation constants for 61 phosphotyrosine peptides on ErbB receptors, performing 77,592 biochemical assays.
Main Results:
- Generated a quantitative protein interaction network revealing novel interactions beyond current domain selectivity understanding.
- Observed differential promiscuity among ErbB receptors; EGFR and ErbB2 become more promiscuous at lower affinity thresholds, unlike ErbB3.
Conclusions:
- The concentration-dependent change in receptor promiscuity may contribute to the oncogenic potential of receptor tyrosine kinases like EGFR and ErbB2, which are overexpressed in cancers.
- This work provides a new perspective on signaling network dynamics and potential cancer mechanisms.
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