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| | ==NMR STRUCTURE OF CALCIUM BOUND CONFORMER OF CONANTOKIN G, MINIMIZED AVERAGE STRUCTURE== | | ==NMR STRUCTURE OF CALCIUM BOUND CONFORMER OF CONANTOKIN G, MINIMIZED AVERAGE STRUCTURE== |
| - | <StructureSection load='1awy' size='340' side='right' caption='[[1awy]], [[NMR_Ensembles_of_Models | 1 NMR models]]' scene=''> | + | <StructureSection load='1awy' size='340' side='right'caption='[[1awy]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[1awy]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Conus_geographus Conus geographus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AWY OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AWY FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[1awy]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Conus_geographus Conus geographus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AWY OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AWY FirstGlance]. <br> |
| - | </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CGU:GAMMA-CARBOXY-GLUTAMIC+ACID'>CGU</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></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='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=1awy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1awy OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1awy RCSB], [http://www.ebi.ac.uk/pdbsum/1awy PDBsum]</span></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CGU:GAMMA-CARBOXY-GLUTAMIC+ACID'>CGU</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene></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=1awy FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1awy OCA], [https://pdbe.org/1awy PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1awy RCSB], [https://www.ebi.ac.uk/pdbsum/1awy PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1awy ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/CKG_CONGE CKG_CONGE] Conantokins inhibit N-methyl-D-aspartate (NMDA) receptors. This toxin is selective for the NR2B/GRIN2B subunit. Induces sleep-like symptoms in young mice and hyperactivity in older mice.<ref>PMID:2165278</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | 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> |
| | </div> | | </div> |
| | + | <div class="pdbe-citations 1awy" style="background-color:#fffaf0;"></div> |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Conus geographus]] | | [[Category: Conus geographus]] |
| - | [[Category: Baleja, J D]] | + | [[Category: Large Structures]] |
| - | [[Category: Furie, B]] | + | [[Category: Baleja JD]] |
| - | [[Category: Furie, B C]] | + | [[Category: Furie B]] |
| - | [[Category: Leping, L]] | + | [[Category: Furie BC]] |
| - | [[Category: Pedersen, L G]] | + | [[Category: Leping L]] |
| - | [[Category: Rigby, A C]] | + | [[Category: Pedersen LG]] |
| - | [[Category: Calcium bound]] | + | [[Category: Rigby AC]] |
| - | [[Category: Conantokin g]]
| + | |
| - | [[Category: Conotoxin]]
| + | |
| - | [[Category: Gamma-carboxyglutamic acid]]
| + | |
| - | [[Category: Venom]]
| + | |
| Structural highlights
Function
CKG_CONGE Conantokins inhibit N-methyl-D-aspartate (NMDA) receptors. This toxin is selective for the NR2B/GRIN2B subunit. Induces sleep-like symptoms in young mice and hyperactivity in older mice.[1]
Publication Abstract from PubMed
Conantokin G is a gamma-carboxyglutamic acid- (Gla-) containing conotoxin isolated from the venom of the marine cone snail Conus geographus. This 17-residue polypeptide, which contains five gamma-carboxyglutamic acid residues, is a N-methyl-d-aspartate- (NMDA-) type glutamate receptor antagonist. To investigate the role of gamma-carboxyglutamic acid in the calcium-induced structural transition of conantokin G, we determined the three-dimensional structure of the conantokin G/Ca2+ complex by two-dimensional 1H NMR spectroscopy and compared it to the high-resolution structure of conantokin G in the absence of metal ions [Rigby et al. (1997) Biochemistry 36, 6906]. Complete resonance assignments were made by two dimensional 1H NMR spectroscopy at pH 5.6 in the presence of saturating amounts of Ca2+. Distance geometry and simulated annealing methods were used to derive 23 convergent structures from a set of 302 interproton distance restraints and two torsion angle measurements. A high-resolution structure, with the backbone root mean square deviation to the geometric average of the 23 structures of 0.6 +/- 0.1 A, contains a linear alpha-helix from Gla 3 to Lys 15. Gla residues 3, 7, 10, and 14 are aligned in a linear array on one face of the helix. A genetic algorithm was applied to determine the calcium positions in conantokin G, and the conantokin G/Ca2+ complex refined by molecular simulation. Upon binding of Ca2+ to gamma-carboxyglutamic acid, conantokin G undergoes a conformational transition from a distorted curvilinear 310 helix to a linear alpha-helix. Occupancy of the metal binding sites, defined by gamma-carboxyglutamic acids, results in formation of a calcium-carboxylate network that linearizes the helix and exposes the hydrophobic amino acids on the opposite face of the helix.
Role of gamma-carboxyglutamic acid in the calcium-induced structural transition of conantokin G, a conotoxin from the marine snail Conus geographus.,Rigby AC, Baleja JD, Li L, Pedersen LG, Furie BC, Furie B Biochemistry. 1997 Dec 16;36(50):15677-84. PMID:9398296[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Olivera BM, Rivier J, Clark C, Ramilo CA, Corpuz GP, Abogadie FC, Mena EE, Woodward SR, Hillyard DR, Cruz LJ. Diversity of Conus neuropeptides. Science. 1990 Jul 20;249(4966):257-63. PMID:2165278
- ↑ Rigby AC, Baleja JD, Li L, Pedersen LG, Furie BC, Furie B. Role of gamma-carboxyglutamic acid in the calcium-induced structural transition of conantokin G, a conotoxin from the marine snail Conus geographus. Biochemistry. 1997 Dec 16;36(50):15677-84. PMID:9398296 doi:10.1021/bi9718550
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