?cl02704: EphR_LBD Superfamily (this model, PSSM-Id:295439 is obsolete and has been replaced by 470656)
 
Ligand Binding Domain of Ephrin Receptors Ephrin receptors (EphRs) comprise the largest subfamily of receptor tyrosine kinases (RTKs). They are subdivided into 2 groups, A and B type receptors, depending on their ligand ephrin-A or ephrin-B, respectively. In general, class EphA receptors bind GPI-anchored ephrin-A ligands. There are ten vertebrate EphA receptors (EphA1-10), which display promiscuous interactions with six ephrin-A ligands. Class EphB receptors bind to transmembrane ephrin-B ligands. There are six vertebrate EhpB receptors (EphB1-6), which display promiscuous interactions with three ephrin-B ligands. One exception is EphB2, which also interacts with ephrin A5. EphRs contain a ligand binding domain and two fibronectin repeats extracellularly, a transmembrane segment, and a cytoplasmic tyrosine kinase domain. Binding of the ephrin ligand to EphR requires cell-cell contact since both are anchored to the plasma membrane. The resulting downstream signals occur bidirectionally in both EphR-expressing cells (forward signaling) and ephrin-expressing cells (reverse signaling). Ephrin/EphR interaction mainly results in cell-cell repulsion or adhesion, making it important in neural development and plasticity, cell morphogenesis, cell-fate determination, embryonic development, tissue patterning, and angiogenesis. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",