PUBLICATION
Distinct subdomains of the EphA3 receptor mediate ligand binding and receptor dimerization
- Authors
- Lackmann, M., Oates, A.C., Dottori, M., Smith, F.M., Do, C., Power, M., Kravets, L., and Boyd, A.W.
- ID
- ZDB-PUB-990107-18
- Date
- 1998
- Source
- The Journal of biological chemistry 273: 20228-20237 (Journal)
- Registered Authors
- Boyd, Andrew W., Do, Cuong, Oates, Andrew
- Keywords
- none
- MeSH Terms
-
- Cell Line
- Microinjections
- Cloning, Molecular
- Evolution, Molecular
- Receptor, EphA3
- Biosensing Techniques
- In Situ Hybridization
- Dimerization
- Animals
- Binding Sites
- Humans
- Protein Binding/physiology
- RNA, Messenger/metabolism
- Ligands
- Phosphorylation
- Morphogenesis/physiology
- Recombinant Proteins/metabolism
- Zebrafish/growth & development*
- Receptor Protein-Tyrosine Kinases/chemistry*
- Receptor Protein-Tyrosine Kinases/genetics
- PubMed
- 9685371 Full text @ J. Biol. Chem.
Citation
Lackmann, M., Oates, A.C., Dottori, M., Smith, F.M., Do, C., Power, M., Kravets, L., and Boyd, A.W. (1998) Distinct subdomains of the EphA3 receptor mediate ligand binding and receptor dimerization. The Journal of biological chemistry. 273:20228-20237.
Abstract
Eph receptor tyrosine kinases and their ligands (ephrins) are highly conserved protein families implicated in patterning events during development, particularly in the nervous system. In a number of functional studies, strict conservation of structure and function across distantly related vertebrate species has been confirmed. In this study we make use of the observation that soluble human EphA3 (HEK) exerts a dominant negative effect on somite formation and axial organization during zebrafish embryogenesis to probe receptor function. Based on exon structure we have dissected the extracellular region of EphA3 receptor into evolutionarily conserved subdomains and used kinetic BIAcore analysis, mRNA injection into zebrafish embryos, and receptor transphosphorylation analysis to study their function. We show that ligand binding is restricted to the N-terminal region encoded by exon III, and we identify an independent, C-terminal receptor-dimerization domain. Recombinant proteins encoding either region in isolation can function as receptor antagonists in zebrafish. We propose a two-step mechanism of Eph receptor activation with distinct ligand binding and ligand-independent receptor-receptor oligomerization events.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping