Tchem EPHB1 Ephrin type-B receptor 1

Protein Summary

Description

Receptor tyrosine kinase which binds promiscuously transmembrane ephrin-B 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. Cognate/functional ephrin ligands for this receptor include EFNB1, EFNB2 and EFNB3. During nervous system development, regulates retinal axon guidance redirecting ipsilaterally ventrotemporal retinal ganglion cells axons at the optic chiasm midline. This probably requires repulsive interaction with EFNB2. In the adult nervous system together with EFNB3, regulates chemotaxis, proliferation and polarity of the hippocampus neural progenitors. In addition to its role in axon guidance plays also an important redundant role with other ephrin-B receptors in development and maturation of dendritic spines and synapse formation. May also regulate angiogenesis. More generally, may play a role in targeted cell migration and adhesion. Upon activation by EFNB1 and probably other ephrin-B ligands activates the MAPK/ERK and the JNK signaling cascades to regulate cell migration and adhesion respectively. Involved in the maintenance of the pool of satellite cells (muscle stem cells) by promoting their self-renewal and reducing their activation and differentiation (By similarity). Ephrin receptors and their ligands, the ephrins, mediate numerous developmental processes, particularly in the nervous system. Based on their structures and sequence relationships, ephrins are divided into the ephrin-A (EFNA) class, which are anchored to the membrane by a glycosylphosphatidylinositol linkage, and the ephrin-B (EFNB) class, which are transmembrane proteins. The Eph family of receptors are divided into 2 groups based on the similarity of their extracellular domain sequences and their affinities for binding ephrin-A and ephrin-B ligands. Ephrin receptors make up the largest subgroup of the receptor tyrosine kinase (RTK) family. The protein encoded by this gene is a receptor for ephrin-B family members. [provided by RefSeq, Jul 2008]

Uniprot Accession IDs

• P54762
• A8K593
• B3KTB2
• B5A969
• O43569
• O95142
• O95143
• Q0VG87

Gene Name

• EPHB1

Ensembl ID

• ENST00000398015
• ENSP00000381097
• ENSG00000154928
• ENST00000493838
• ENSP00000419574

Symbol

• ELK
• EPHT2
• HEK6
• NET
• ELK
• NET
• Hek6
• EPHT2

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
protein domain	1
molecular function	0.99
biological process	0.82
trait	0.75
transcription factor binding site profile	0.73

Protein Classes

DTO Classes

Protein / Kinase / Protein Kinase / Tk Group / Eph Family / Ephrin Type-b Receptor 1

IDG Development Level Summary

Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 77.69   (req: < 5)

Gene RIFs: 32   (req: <= 3)

Antibodies: 524   (req: <= 50)

Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 77.69   (req: >= 5)

Gene RIFs: 32   (req: > 3)

Antibodies: 524   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 36

Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligands: 7

Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 1