Ephrin B3

Ephrin-B3 is a protein that in humans is encoded by the EFNB3 gene.[5][6]

EFNB3
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 4BKF
Identifiers
Aliases	EFNB3, EFL6, EPLG8, LERK8, ephrin B3
External IDs	OMIM: 602297 MGI: 109196 HomoloGene: 1076 GeneCards: EFNB3
Gene location (Human) Chr. Chromosome 17 (human)[1] Band 17p13.1 Start 7,705,202 bp[1] End 7,711,372 bp[1]
Gene location (Mouse) Chr. Chromosome 11 (mouse)[2] Band 11 B3|11 42.8 cM Start 69,444,918 bp[2] End 69,451,031 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in middle temporal gyrus nucleus accumbens endothelial cell prefrontal cortex Brodmann area 46 ganglionic eminence dorsolateral prefrontal cortex caudate nucleus entorhinal cortex Brodmann area 9 Top expressed in entorhinal cortex superior frontal gyrus subiculum suprachiasmatic nucleus globus pallidus nucleus accumbens dorsomedial hypothalamic nucleus ventromedial nucleus hippocampus proper arcuate nucleus More reference expression data BioGPS More reference expression data
Gene ontology Molecular function ephrin receptor binding transmembrane-ephrin receptor activity virus receptor activity protein tyrosine kinase activity Cellular component integral component of membrane integral component of plasma membrane membrane plasma membrane hippocampal mossy fiber to CA3 synapse glutamatergic synapse integral component of presynaptic membrane integral component of postsynaptic density membrane Biological process ephrin receptor signaling pathway multicellular organism development cell-cell signaling viral entry into host cell T cell costimulation cell differentiation viral process axon choice point recognition nervous system development adult walking behavior axon guidance peptidyl-tyrosine phosphorylation negative regulation of axonogenesis trans-synaptic signaling by trans-synaptic complex, modulating synaptic transmission Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 1949 13643 Ensembl ENSG00000108947 ENSMUSG00000003934 UniProt Q15768 O35393 RefSeq (mRNA) NM_001406 NM_007911 RefSeq (protein) NP_001397 NP_031937 Location (UCSC) Chr 17: 7.71 – 7.71 Mb Chr 11: 69.44 – 69.45 Mb PubMed search [3] [4]
Wikidata
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EFNB3, a member of the ephrin gene family, is important in brain development as well as in its maintenance. The EPH and EPH-related receptors comprise the largest subfamily of receptor protein-tyrosine kinases. EPH receptors typically have a single kinase domain and an extracellular region containing a Cysteine-rich domain and 2 fibronectin type III repeats. The ephrin ligands and receptors have been named by the Eph Nomenclature Committee (1997) 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. Ephrin-B ligands also contain an intracellular tail with highly conserved tyrosine residues and a PDZ-binding motif at the C-terminus.[7] This tail functions as a mechanism for reverse signaling, where signaling occurs into the ligand-containing cell, as opposed to the cell with the receptor. Upon receptor-ligand interaction the tyrosine residues become phosphorylated and there is recruitment of PDZ domain-containing proteins.[7] The Eph family of receptors are similarly divided into two groups based on the similarity of their extracellular domain sequences and their affinities for binding ephrin-A and ephrin-B ligands.[6] EphrinB3 has been implicated in mediating various developmental events, particularly in the nervous system. EphrinB3 reverse signaling is important for axon pruning and synapse and spine formation during postnatal development of the nervous system.[8][9] Previous work has also shown that signaling through this ligand is important for radial migration during cortical development.[8] Moreover, levels of EFNB3 expression are particularly high in several forebrain subregions compared to other brain subregions, and may play a pivotal role in forebrain function. It has been suggested that ephrinB3 signaling is necessary for synaptic plasticity to occur in the hippocampus; this implicates ephrinB3 as a major player in learning and memory.[9] More recently, ephrinB3 has been shown to regulate proliferation of neural stem cells in the adult subventricular zone (SVZ).[8][10]