4kfq
From Proteopedia
(Difference between revisions)
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<StructureSection load='4kfq' size='340' side='right' caption='[[4kfq]], [[Resolution|resolution]] 2.20Å' scene=''> | <StructureSection load='4kfq' size='340' side='right' caption='[[4kfq]], [[Resolution|resolution]] 2.20Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>[[4kfq]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/ | + | <table><tr><td colspan='2'>[[4kfq]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Buffalo_rat Buffalo rat]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KFQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4KFQ FirstGlance]. <br> |
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=KFQ:1-SULFANYL[1,2,4]TRIAZOLO[4,3-A]QUINOXALIN-4(5H)-ONE'>KFQ</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=KFQ:1-SULFANYL[1,2,4]TRIAZOLO[4,3-A]QUINOXALIN-4(5H)-ONE'>KFQ</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1pbq|1pbq]], [[1pb7|1pb7]], [[1pb8|1pb8]], [[1pb9|1pb9]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1pbq|1pbq]], [[1pb7|1pb7]], [[1pb8|1pb8]], [[1pb9|1pb9]]</td></tr> | ||
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Grin1, GRIN1 OR NMDAR1, Nmdar1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Grin1, GRIN1 OR NMDAR1, Nmdar1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Buffalo rat])</td></tr> |
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4kfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kfq OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kfq RCSB], [http://www.ebi.ac.uk/pdbsum/4kfq PDBsum]</span></td></tr> | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4kfq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kfq OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kfq RCSB], [http://www.ebi.ac.uk/pdbsum/4kfq PDBsum]</span></td></tr> | ||
</table> | </table> | ||
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<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
| - | + | NMDA receptors are ligand-gated ion channels that mediate excitatory neurotransmission in the brain. They are tetrameric complexes composed of glycine-binding GluN1 and GluN3 subunits together with glutamate-binding GluN2 subunits. Subunit-selective antagonists that discriminate between the glycine sites of GluN1 and GluN3 subunits would be valuable pharmacological tools for studies on the function and physiological roles of NMDA receptor subtypes. In a virtual screening for antagonists that exploit differences in the orthosteric binding site of GluN1 and GluN3 subunits, we identified a novel glycine site antagonist, 1-thioxo-1,2-dihydro-[1,2,4]triazolo[4,3-a]quinoxalin-4(5H)-one (TK40). Here, we show by Schild analysis that TK40 is a potent competitive antagonist with Kb values of 21-63 nM at the GluN1 glycine-binding site of the four recombinant GluN1/N2A-D receptors. In addition, TK40 displayed >100-fold selectivity for GluN1/N2 NMDA receptors over GluN3A- and GluN3B-containing NMDA receptors and no appreciable effects at AMPA receptors. Binding experiments on rat brain membranes and the purified GluN1 ligand-binding domain using glycine site GluN1 radioligands further confirmed the competitive interaction and high potency. To delineate the binding mechanism, we have solved the crystal structure of the GluN1 ligand-binding domain in complex with TK40 and show that TK40 binds to the orthosteric binding site of the GluN1 subunit with a binding mode that was also predicted by virtual screening. Furthermore, the structure reveals that the imino acetamido group of TK40 acts as an alpha-amino acid bioisostere, which could be of importance in bioisosteric replacement strategies for future ligand design. | |
| - | + | Crystal structure and pharmacological characterization of a novel N-methyl-D-aspartate (NMDA) receptor antagonist at the GluN1 glycine binding site.,Kvist T, Steffensen TB, Greenwood JR, Mehrzad Tabrizi F, Hansen KB, Gajhede M, Pickering DS, Traynelis SF, Kastrup JS, Brauner-Osborne H J Biol Chem. 2013 Nov 15;288(46):33124-35. doi: 10.1074/jbc.M113.480210. Epub, 2013 Sep 26. PMID:24072709<ref>PMID:24072709</ref> | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
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__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| - | [[Category: | + | [[Category: Buffalo rat]] |
[[Category: Gajhede, M]] | [[Category: Gajhede, M]] | ||
[[Category: Kastrup, J S]] | [[Category: Kastrup, J S]] | ||
Revision as of 12:12, 1 July 2015
Crystal structure of the NMDA receptor GluN1 ligand binding domain in complex with 1-thioxo-1,2-dihydro-[1,2,4]triazolo[4,3-a]quinoxalin-4(5H)-one
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