ID:EPHB2_HUMAN DESCRIPTION: RecName: Full=Ephrin type-B receptor 2; EC=2.7.10.1; AltName: Full=Developmentally-regulated Eph-related tyrosine kinase; AltName: Full=ELK-related tyrosine kinase; AltName: Full=EPH tyrosine kinase 3; AltName: Full=EPH-like kinase 5; Short=EK5; Short=hEK5; AltName: Full=Renal carcinoma antigen NY-REN-47; AltName: Full=Tyrosine-protein kinase TYRO5; AltName: Full=Tyrosine-protein kinase receptor EPH-3; Flags: Precursor; FUNCTION: 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. Functions in axon guidance during development. Involved in the guidance of commissural axons, that form a major interhemispheric connection between the 2 temporal lobs of the cerebral cortex. Also involved in guidance of contralateral inner ear efferent growth cones at the midline and of retinal ganglion cell axons to the optic disk. Beside axon guidance, also regulates dendritic spines development and maturation and stimulates the formation of excitatory synapses. Upon activation by EFNB1, abolishes the ARHGEF15-mediated negative regulation on excitatory synapse formation. Controls other aspects of development including angiogenesis, palate development and in inner ear development through regulation of endolymph production. Forward and reverse signaling through the EFNB2/EPHB2 complex regulate movement and adhesion of cells that tubularize the urethra and septate the cloaca. May function as a tumor suppressor. CATALYTIC ACTIVITY: ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. SUBUNIT: 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 (By similarity). Interacts (via PDZ-binding motif) with GRIP1 and PICK1 (via PDZ domain) (By similarity). Interacts with ARHGEF15; mediates ARHGEF15 phosphorylation, ubiquitination and degradation by the proteasome. Interacts with AQP1; involved in endolymph production in the inner ear. SUBCELLULAR LOCATION: Cell membrane; Single-pass type I membrane protein. Cell projection, axon (By similarity). Cell projection, dendrite (By similarity). TISSUE SPECIFICITY: Brain, heart, lung, kidney, placenta, pancreas, liver and skeletal muscle. Preferentially expressed in fetal brain. DISEASE: Defects in EPHB2 may be a cause of susceptibility to prostate cancer (PC) [MIM:176807]. It is a malignancy originating in tissues of the prostate. Most prostate cancers are adenocarcinomas that develop in the acini of the prostatic ducts. Other rare histopathologic types of prostate cancer that occur in approximately 5% of patients include small cell carcinoma, mucinous carcinoma, prostatic ductal carcinoma, transitional cell carcinoma, squamous cell carcinoma, basal cell carcinoma, adenoid cystic carcinoma (basaloid), signet-ring cell carcinoma and neuroendocrine carcinoma. Note=EPHB2 mutations have been found in a prostate cancer cell line derived from a brain metastasis. SIMILARITY: Belongs to the protein kinase superfamily. Tyr protein kinase family. Ephrin receptor subfamily. SIMILARITY: Contains 1 Eph LBD (Eph ligand-binding) domain. SIMILARITY: Contains 2 fibronectin type-III domains. SIMILARITY: Contains 1 protein kinase domain. SIMILARITY: Contains 1 SAM (sterile alpha motif) domain.
The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.
ModBase Predicted Comparative 3D Structure on P29323
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Orthologous Genes in Other Species
Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
US Server
Sequence and Links to Tools and Databases 
Common Gene Haplotype Alleles 
