4M4P image
Entry Detail
PDB ID:
4M4P
Keywords:
Title:
Crystal structure of EPHA4 ectodomain
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2013-08-07
Release Date:
2013-10-30
Method Details:
Experimental Method:
Resolution:
2.08 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 32
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Ephrin type-A receptor 4
Chain IDs:A
Chain Length:518
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Ligand Molecules
Primary Citation
Insights into Eph receptor tyrosine kinase activation from crystal structures of the EphA4 ectodomain and its complex with ephrin-A5.
Proc.Natl.Acad.Sci.USA 110 14634 14639 (2013)
PMID: 23959867 DOI: 10.1073/pnas.1311000110

Abstact

Eph receptor tyrosine kinases and their ephrin ligands mediate cell signaling during normal and oncogenic development. Eph signaling is initiated in a multistep process leading to the assembly of higher-order Eph/ephrin clusters that set off bidirectional signaling in interacting cells. Eph and ephrins are divided in two subclasses based on their abilities to bind and activate each other and on sequence conservation. EphA4 is an exception to the general rule because it can be activated by both A- and B-class ephrin ligands. Here we present high-resolution structures of the complete EphA4 ectodomain and its complexes with ephrin-A5. The structures reveal how ligand binding promotes conformational changes in the EphA4 ligand-binding domain allowing the formation of signaling clusters at the sites of cell-cell contact. In addition, the structural data, combined with structure-based mutagenesis, reveal a previously undescribed receptor-receptor interaction between the EphA4 ligand-binding and membrane-proximal fibronectin domains, which is functionally important for efficient receptor activation.

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