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| | <StructureSection load='2vlw' size='340' side='right'caption='[[2vlw]], [[Resolution|resolution]] 1.39Å' scene=''> | | <StructureSection load='2vlw' size='340' side='right'caption='[[2vlw]], [[Resolution|resolution]] 1.39Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2vlw]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VLW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2VLW FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2vlw]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Dendroaspis_angusticeps Dendroaspis angusticeps]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2VLW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2VLW FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.39Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=TYI:3,5-DIIODOTYROSINE'>TYI</scene></td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TYI:3,5-DIIODOTYROSINE'>TYI</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=2vlw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2vlw OCA], [https://pdbe.org/2vlw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2vlw RCSB], [https://www.ebi.ac.uk/pdbsum/2vlw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2vlw 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=2vlw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2vlw OCA], [https://pdbe.org/2vlw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2vlw RCSB], [https://www.ebi.ac.uk/pdbsum/2vlw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2vlw ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/NXM11_DENAN NXM11_DENAN]] Binds irreversibly and specifically to M1 (CHRM1) muscarinic acetylcholine receptors, blocking further binding of antagonists and preventing the action of agonists.<ref>PMID:11562434</ref> <ref>PMID:10799315</ref>
| + | [https://www.uniprot.org/uniprot/3SIM7_DENAN 3SIM7_DENAN] Binds irreversibly and specifically to an allosteric site of the muscarinic acetylcholine M1 receptor (CHRM1).<ref>PMID:10799315</ref> <ref>PMID:11562434</ref> <ref>PMID:12488533</ref> <ref>PMID:21557730</ref> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | + | [[Category: Dendroaspis angusticeps]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Fruchart-Gaillard, C]] | + | [[Category: Fruchart-Gaillard C]] |
| - | [[Category: Granata, V]] | + | [[Category: Granata V]] |
| - | [[Category: Menez, A]] | + | [[Category: Menez A]] |
| - | [[Category: Menez, R]] | + | [[Category: Menez R]] |
| - | [[Category: Mourier, G]] | + | [[Category: Mourier G]] |
| - | [[Category: Servant, D]] | + | [[Category: Servant D]] |
| - | [[Category: Stura, E A]] | + | [[Category: Stura EA]] |
| - | [[Category: Acetylcholine receptor inhibitor]]
| + | |
| - | [[Category: Diiodotyrosine]]
| + | |
| - | [[Category: Green mamba snake toxin]]
| + | |
| - | [[Category: Hm1 muscarinic receptor]]
| + | |
| - | [[Category: Muscarinic toxin]]
| + | |
| - | [[Category: Neurotoxin]]
| + | |
| - | [[Category: Postsynaptic neurotoxin]]
| + | |
| - | [[Category: Secreted]]
| + | |
| - | [[Category: Toxin]]
| + | |
| Structural highlights
Function
3SIM7_DENAN Binds irreversibly and specifically to an allosteric site of the muscarinic acetylcholine M1 receptor (CHRM1).[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.
Publication Abstract from PubMed
Muscarinic MT7 toxin is a highly selective and potent antagonist of the M(1) subtype of muscarinic receptor and acts by binding to an allosteric site. To identify the molecular determinants by which MT7 toxin interacts with this receptor in its free and NMS-occupied states, the effect on toxin potency of alanine substitution was evaluated in equilibrium and kinetic binding experiments as well as in functional assays. The determination of the crystallographic structure of an MT7-derivative (MT7-diiodoTyr51) allowed the selection of candidate residues that are accessible and present on both faces of the three toxin loops. The equilibrium binding data are consistent with negative cooperativity between N-methylscopolamine (NMS) and wild-type or modified MT7 and highlight the critical role of the tip of the central loop of the toxin (Arg34, Met35 Tyr36) in its interaction with the unoccupied receptor. Examination of the potency of wild-type and modified toxins to allosterically decrease the dissociation rate of [(3)H]NMS allowed the identification of the MT7 residues involved in its interaction with the NMS-occupied receptor. In contrast to the results with the unoccupied receptor, the most important residue for this interaction was Tyr36 in loop II, assisted by Trp10 in loop I and Arg52 in loop III. The critical role of the tips of the MT7 loops was also confirmed in functional experiments. The high specificity of the MT7-M(1) receptor interaction exploits several MT7-specific residues and reveals a different mode of interaction of the toxin with the free and NMS-occupied states of the receptor.
Different interactions between MT7 toxin and the human muscarinic M1 receptor in its free and N-methylscopolamine-occupied states.,Fruchart-Gaillard C, Mourier G, Marquer C, Stura E, Birdsall NJ, Servent D Mol Pharmacol. 2008 Dec;74(6):1554-63. Epub 2008 Sep 10. PMID:18784346[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Nasman J, Jolkkonen M, Ammoun S, Karlsson E, Akerman KE. Recombinant expression of a selective blocker of M(1) muscarinic receptors. Biochem Biophys Res Commun. 2000 May 10;271(2):435-9. PMID:10799315 doi:http://dx.doi.org/10.1006/bbrc.2000.2657
- ↑ Krajewski JL, Dickerson IM, Potter LT. Site-directed mutagenesis of m1-toxin1: two amino acids responsible for stable toxin binding to M(1) muscarinic receptors. Mol Pharmacol. 2001 Oct;60(4):725-31. PMID:11562434
- ↑ Mourier G, Dutertre S, Fruchart-Gaillard C, Menez A, Servent D. Chemical synthesis of MT1 and MT7 muscarinic toxins: critical role of Arg-34 in their interaction with M1 muscarinic receptor. Mol Pharmacol. 2003 Jan;63(1):26-35. PMID:12488533
- ↑ Nareoja K, Kukkonen JP, Rondinelli S, Toivola DM, Meriluoto J, Nasman J. Adrenoceptor activity of muscarinic toxins identified from mamba venoms. Br J Pharmacol. 2011 Sep;164(2b):538-50. doi: 10.1111/j.1476-5381.2011.01468.x. PMID:21557730 doi:http://dx.doi.org/10.1111/j.1476-5381.2011.01468.x
- ↑ Fruchart-Gaillard C, Mourier G, Marquer C, Stura E, Birdsall NJ, Servent D. Different interactions between MT7 toxin and the human muscarinic M1 receptor in its free and N-methylscopolamine-occupied states. Mol Pharmacol. 2008 Dec;74(6):1554-63. Epub 2008 Sep 10. PMID:18784346 doi:http://dx.doi.org/mol.108.050773
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