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| | ==NMR structures of dimeric transmembrane domain of the receptor tyrosine kinase EphA1 in lipid bicelles at pH 6.3== | | ==NMR structures of dimeric transmembrane domain of the receptor tyrosine kinase EphA1 in lipid bicelles at pH 6.3== |
| - | <StructureSection load='2k1l' size='340' side='right'caption='[[2k1l]], [[NMR_Ensembles_of_Models | 12 NMR models]]' scene=''> | + | <StructureSection load='2k1l' size='340' side='right'caption='[[2k1l]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2k1l]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2K1L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2K1L FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2k1l]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2K1L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2K1L FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">EPHA1, EPH, EPHT, EPHT1 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Receptor_protein-tyrosine_kinase Receptor protein-tyrosine kinase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.10.1 2.7.10.1] </span></td></tr>
| + | |
| | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2k1l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k1l OCA], [https://pdbe.org/2k1l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2k1l RCSB], [https://www.ebi.ac.uk/pdbsum/2k1l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2k1l ProSAT]</span></td></tr> | | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2k1l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k1l OCA], [https://pdbe.org/2k1l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2k1l RCSB], [https://www.ebi.ac.uk/pdbsum/2k1l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2k1l ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/EPHA1_HUMAN EPHA1_HUMAN]] 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.<ref>PMID:17634955</ref> <ref>PMID:19118217</ref> <ref>PMID:20043122</ref>
| + | [https://www.uniprot.org/uniprot/EPHA1_HUMAN EPHA1_HUMAN] 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.<ref>PMID:17634955</ref> <ref>PMID:19118217</ref> <ref>PMID:20043122</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Receptor protein-tyrosine kinase]]
| + | [[Category: Arseniev AS]] |
| - | [[Category: Arseniev, A S]] | + | [[Category: Bocharov EV]] |
| - | [[Category: Bocharov, E V]] | + | [[Category: Goncharuk MV]] |
| - | [[Category: Goncharuk, M V]] | + | [[Category: Mayzel ML]] |
| - | [[Category: Mayzel, M L]] | + | |
| - | [[Category: Atp-binding]]
| + | |
| - | [[Category: Dimeric transmembrane domain]]
| + | |
| - | [[Category: Epha1]]
| + | |
| - | [[Category: Glycoprotein]]
| + | |
| - | [[Category: Nucleotide-binding]]
| + | |
| - | [[Category: Phosphoprotein]]
| + | |
| - | [[Category: Polymorphism]]
| + | |
| - | [[Category: Receptor tyrosine kinase]]
| + | |
| - | [[Category: Signaling protein]]
| + | |
| - | [[Category: Transferase]]
| + | |
| - | [[Category: Tyrosine-protein kinase]]
| + | |
| Structural highlights
Function
EPHA1_HUMAN 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.[1] [2] [3]
Publication Abstract from PubMed
Eph receptors are found in a wide variety of cells in developing and mature tissues and represent the largest family of receptor tyrosine kinases, regulating cell shape, movements, and attachment. The receptor tyrosine kinases conduct biochemical signals across plasma membrane via lateral dimerization, in which their transmembrane domains play an important role. Structural-dynamic properties of the homodimeric transmembrane domain of the EphA1 receptor were investigated with the aid of solution NMR in lipid bicelles and molecular dynamics in explicit lipid bilayer. EphA1 transmembrane segments associate in a right-handed parallel a-helical bundle (544-569)(2) through the N-terminal glycine zipper motif A(550)X(sub3}G(554)X(sub3}G(super558}. Under acidic conditions, the N-terminus of the transmembrane helix is stabilized by an N-capping box formed by uncharged carboxyl group of Glu(547), while its deprotonation results in a rearrangement of hydrogen bonds, fractional unfolding of the helix, and a realignment of the helix-helix packing with appearance of additional minor dimer conformation employing seemingly the C-terminal GG4-like dimerization motif A(560)X(sub3}G(super564}. This can be interpreted as ability of the EphA1 receptor to adjust its response to ligand binding according to extracellular pH. The dependence of the pKa value of Glu(super547} and the dimer conformational equilibrium on the lipid head charge suggests that both local environment and membrane surface potential can modulate dimerization and activation of the receptor. This makes the EphA1 receptor unique among Eph family, implying its possible physiological role as an "extracellular pH sensor", and can have relevant physiological implications.
Spatial structure and pH-dependent conformational diversity of dimeric transmembrane domain of the receptor tyrosine kinase EphA1.,Bocharov EV, Mayzel ML, Volynsky PE, Goncharuk MV, Ermolyuk YS, Schulga AA, Artemenko EO, Efremov RG, Arseniev AS J Biol Chem. 2008 Aug 26. PMID:18728013[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Hjorthaug HS, Aasheim HC. Ephrin-A1 stimulates migration of CD8+CCR7+ T lymphocytes. Eur J Immunol. 2007 Aug;37(8):2326-36. PMID:17634955 doi:10.1002/eji.200737111
- ↑ Yamazaki T, Masuda J, Omori T, Usui R, Akiyama H, Maru Y. EphA1 interacts with integrin-linked kinase and regulates cell morphology and motility. J Cell Sci. 2009 Jan 15;122(Pt 2):243-55. doi: 10.1242/jcs.036467. PMID:19118217 doi:10.1242/jcs.036467
- ↑ Chen G, Wang Y, Zhou M, Shi H, Yu Z, Zhu Y, Yu F. EphA1 receptor silencing by small interfering RNA has antiangiogenic and antitumor efficacy in hepatocellular carcinoma. Oncol Rep. 2010 Feb;23(2):563-70. PMID:20043122
- ↑ Bocharov EV, Mayzel ML, Volynsky PE, Goncharuk MV, Ermolyuk YS, Schulga AA, Artemenko EO, Efremov RG, Arseniev AS. Spatial structure and pH-dependent conformational diversity of dimeric transmembrane domain of the receptor tyrosine kinase EphA1. J Biol Chem. 2008 Aug 26. PMID:18728013 doi:M803089200
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