Orchestration of ErbB3 signaling through heterointeractions and homointeractions
Journal Article
·
· Molecular Biology of the Cell
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies; DOE/OSTI
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Pathology; Univ. of New Mexico, Albuquerque, NM (United States). Univ. of New Mexico Health Sciences Center. Cancer Center
- West Virginia Univ., Morgantown, WV (United States). Dept. of Mathematics
- Univ. of Iowa, Iowa City, IA (United States). Carver College of Medicine. Dept. of OB/GYN
- Viracor-IBT Labs, Lee’s Summit, MO (United States)
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Pathology
- Sanford-Burnham Medical Research Institute, La Jolla, CA (United States). Bioinformatics and Systems Biology Program
- Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemical and Biological Engineering; Univ. of New Mexico, Albuquerque, NM (United States). Univ. of New Mexico Health Sciences Center. Cancer Center; Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Chemistry and Chemical Biology
Members of the ErbB family of receptor tyrosine kinases are capable of both homointeractions and heterointeractions. Because each receptor has a unique set of binding sites for downstream signaling partners and differential catalytic activity, subtle shifts in their combinatorial interplay may have a large effect on signaling outcomes. The overexpression and mutation of ErbB family members are common in numerous human cancers and shift the balance of activation within the signaling network. Here we report the development of a spatial stochastic model that addresses the dynamics of ErbB3 homodimerization and heterodimerization with ErbB2. The model is based on experimental measures for diffusion, dimer off-rates, kinase activity, and dephosphorylation. We also report computational analysis of ErbB3 mutations, generating the prediction that activating mutations in the intracellular and extracellular domains may be subdivided into classes with distinct underlying mechanisms. We show experimental evidence for an ErbB3 gain-of-function point mutation located in the C-lobe asymmetric dimerization interface, which shows enhanced phosphorylation at low ligand dose associated with increased kinase activity.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1625236
- Journal Information:
- Molecular Biology of the Cell, Journal Name: Molecular Biology of the Cell Journal Issue: 22 Vol. 26; ISSN 1059-1524
- Publisher:
- American Society for Cell BiologyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Effect of Spatial Inhomogeneities on the Membrane Surface on Receptor Dimerization and Signal Initiation
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