EPHA1

This gene belongs to the ephrin receptor subfamily of the protein-tyrosine kinase family. EPH and EPH-related receptors have been implicated in mediating developmental events, particularly in the nervous system. Receptors in the EPH subfamily typically have a single kinase domain and an extracellular region containing a Cys-rich domain and 2 fibronectin type III repeats. The ephrin 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. This gene is expressed in some human cancer cell lines and has been implicated in carcinogenesis. [provided by RefSeq, Jul 2008]

EPH Receptor A1

Receptor tyrosine kinase which binds promiscuously membrane-bound ephrin-A 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. Binds with a low affinity EFNA3 and EFNA4 and with a high affinity to EFNA1 which most probably constitutes its cognate/functional ligand. Upon activation by EFNA1 induces cell attachment to the extracellular matrix inhibiting cell spreading and motility through regulation of ILK and downstream RHOA and RAC. Plays also a role in angiogenesis and regulates cell proliferation. May play a role in apoptosis.

Activation of GTPase activity Source: UniProtKB
Angiogenesis Source: UniProtKB-KW
Axon guidance Source: GO_Central
Cell surface receptor signaling pathway Source: UniProtKB
Negative regulation of cell migration Source: UniProtKB
Negative regulation of protein kinase activity Source: UniProtKB
Peptidyl-tyrosine phosphorylation Source: UniProtKB
Positive regulation of angiogenesis Source: UniProtKB
Positive regulation of cell-matrix adhesion Source: UniProtKB
Positive regulation of cell migration Source: UniProtKB
Positive regulation of cell population proliferation Source: UniProtKB
Positive regulation of kinase activity Source: GO_Central
Positive regulation of stress fiber assembly Source: UniProtKB
Protein autophosphorylation Source: UniProtKB
Regulation of GTPase activity Source: UniProtKB
Substrate adhesion-dependent cell spreading Source: UniProtKB
Transmembrane receptor protein tyrosine kinase signaling pathway Source: GO_Central

Cell membrane

Extracellular: 26-547
Helical: 548-568
Cytoplasmic: 569-976

Phosphorylated. Autophosphorylation is stimulated by its ligand EFNA1.
Ubiquitinated.