1shx

Structural highlights

Function

EFNA5_MOUSE Cell surface GPI-bound ligand for Eph receptors, a family of receptor tyrosine kinases which are crucial for migration, repulsion and adhesion during neuronal, vascular and epithelial development. Binds promiscuously Eph receptors 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. Induces compartmentalized signaling within a caveolae-like membrane microdomain when bound to the extracellular domain of its cognate receptor. This signaling event requires the activity of the Fyn tyrosine kinase. Activates the EPHA3 receptor to regulate cell-cell adhesion and cytoskeletal organization. With the receptor EPHA2 may regulate lens fiber cells shape and interactions and be important for lens transparency maintenance. May function actively to stimulate axon fasciculation. The interaction of EFNA5 with EPHA5 also mediates communication between pancreatic islet cells to regulate glucose-stimulated insulin secretion. Cognate/functional ligand for EPHA7, their interaction regulates brain development modulating cell-cell adhesion and repulsion.^{[1] [2] [3] [4]}

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

• Ephrin
• Ephrin receptor 3D structures

References

1. ↑ Park S, Sanchez MP. The Eek receptor, a member of the Eph family of tyrosine protein kinases, can be activated by three different Eph family ligands. Oncogene. 1997 Feb 6;14(5):533-42. PMID:9053851 doi:http://dx.doi.org/10.1038/sj.onc.1200857
2. ↑ Holmberg J, Clarke DL, Frisen J. Regulation of repulsion versus adhesion by different splice forms of an Eph receptor. Nature. 2000 Nov 9;408(6809):203-6. PMID:11089974 doi:http://dx.doi.org/10.1038/35041577
3. ↑ Konstantinova I, Nikolova G, Ohara-Imaizumi M, Meda P, Kucera T, Zarbalis K, Wurst W, Nagamatsu S, Lammert E. EphA-Ephrin-A-mediated beta cell communication regulates insulin secretion from pancreatic islets. Cell. 2007 Apr 20;129(2):359-70. PMID:17448994 doi:http://dx.doi.org/10.1016/j.cell.2007.02.044
4. ↑ Cooper MA, Son AI, Komlos D, Sun Y, Kleiman NJ, Zhou R. Loss of ephrin-A5 function disrupts lens fiber cell packing and leads to cataract. Proc Natl Acad Sci U S A. 2008 Oct 28;105(43):16620-5. doi:, 10.1073/pnas.0808987105. Epub 2008 Oct 23. PMID:18948590 doi:http://dx.doi.org/10.1073/pnas.0808987105
5. ↑ Day B, To C, Himanen JP, Smith FM, Nikolov DB, Boyd AW, Lackmann M. Three distinct molecular surfaces in ephrin-A5 are essential for a functional interaction with EphA3. J Biol Chem. 2005 Jul 15;280(28):26526-32. Epub 2005 May 18. PMID:15901737 doi:10.1074/jbc.M504972200