Molecular Target Synopsis
Overview
Domains and Structures
Drugs and Clinical Candidates
Druggability
Chemistry
Ligand Efficiency Plot
Pathways
Family Cladogram
Interaction Network
Gene Expression
Gene Copy Number Variation
RNAi
Mutations
Germline Genetics

Epha4 (Q03137) - Overview - Molecular Target Synopsis

Protein


Epha4, Ephrin type-A receptor 4
Enzyme Classification 2.7.10.1
UniProt Q03137

Also Known as EPHA4_MOUSE, Epha4, Sek, Sek1

Receptor tyrosine kinase which binds membrane-bound ephrin family ligands residing on adjacent cells, leading to contact-dependent bidirectional signaling into neighboring cells. The signaling pathway downstream of the receptor is referred to as forward signaling while the signaling pathway downstream of the ephrin ligand is referred to as reverse signaling. Highly promiscuous, it has the unique property among Eph receptors to bind and to be physiologically activated by both GPI-anchored ephrin-A and transmembrane ephrin-B ligands including EFNA1 and EFNB3. Upon activation by ephrin ligands, modulates cell morphology and integrin-dependent cell adhesion through regulation of the Rac, Rap and Rho GTPases activity. Plays an important role in the development of the nervous system controlling different steps of axonal guidance including the establishment of the corticospinal projections. May also control the segregation of motor and sensory axons during neuromuscular circuit development. In addition to its role in axonal guidance plays a role in synaptic plasticity. Activated by EFNA1 phosphorylates CDK5 at 'Tyr-15' which in turn phosphorylates NGEF regulating RHOA and dendritic spine morphogenesis. In the nervous system, plays also a role in repair after injury preventing axonal regeneration and in angiogenesis playing a role in central nervous system vascular formation. Additionally, its promiscuity makes it available to participate in a variety of cell-cell signaling regulating for instance the development of the thymic epithelium. Heterotetramer upon binding of the ligand. The heterotetramer is composed of an ephrin dimer and a receptor dimer. Oligomerization is probably required to induce biological responses. Interacts (phosphorylated at position Tyr-602) with FYN. Interacts (via PDZ motif) with SIPA1L1 (via PDZ domain); controls neuronal morphology through regulation of the RAP1 (RAP1A or RAP1B) and RAP2 (RAP2A, RAP2B or RAP2C) GTPases. Interacts with CDK5, CDK5R1 and NGEF; upon activation by EFNA1 induces NGEF phosphorylation by the kinase CDK5. Interacts with CHN1; effector of EPHA4 in axon guidance linking EPHA4 activation to RAC1 regulation.

2XYU
CRYSTAL STRUCTURE OF EPHA4 KINASE DOMAIN IN COMPLEX WITH VUF 12058
RCSB/PDB
Inspect Structure
See all 3D Structures for Epha4

Isoforms / Transcripts (Protein Coding)


Protein Length Ensembl Gene Ensembl Transcript Ensembl Protein Uniprot Isoform
986Q03137-1
936Q03137-2

Sub-cellular localization


Gene Copy Number Variation


In COSMIC - Cell Lines Project Epha4 has gain in 0 cell-lines, loss in 0 cell-lines and no signal in 0 cell-lines. (see details)

3D Structures


For Epha4 there are:
5 structures (5 chains) solved
2 are solved in complex with at least one small molecule ligand
1 are solved with an approved drug

Epha4 is solved in complex with the approved drug(s):

1N1/DASATINIB (2Y6O_A).

(see details)
Molecular Target 3D Synopsis

Screening and Chemistry


Epha4 has been screened with compounds ( bioactivities). (see details)