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== | ==Crystal Structure Of Acetylcholine Binding Protein (AChBP) From Aplysia Californica In Complex With alpha-Conotoxin ImI== | ||
The nicotinic acetylcholine receptor (nAChR) is the prototype member of | <StructureSection load='2c9t' size='340' side='right'caption='[[2c9t]], [[Resolution|resolution]] 2.25Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2c9t]] is a 18 chain structure with sequence from [https://en.wikipedia.org/wiki/Aplysia_californica Aplysia californica] and [https://en.wikipedia.org/wiki/Conus_imperialis Conus imperialis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2C9T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2C9T FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.25Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=2c9t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2c9t OCA], [https://pdbe.org/2c9t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2c9t RCSB], [https://www.ebi.ac.uk/pdbsum/2c9t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2c9t ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q8WSF8_APLCA Q8WSF8_APLCA] | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/c9/2c9t_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2c9t ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The nicotinic acetylcholine receptor (nAChR) is the prototype member of the superfamily of pentameric ligand-gated ion channels. How the extracellular ligand-binding domain coordinates selective binding of ligand molecules to different subtypes of the receptor is unknown at the structural level. Here, we present the 2.2-A crystal structure of a homolog of the ligand-binding domain of the nAChR, Aplysia californica AChBP (Ac-AChBP), in complex with alpha-conotoxin ImI. This conotoxin is unique in its selectivity toward the neuronal alpha3beta2 and alpha7 nAChR, a feature that is reflected in its selective binding to Ac-AChBP compared with other AChBP homologs. We observe a network of interactions between the residues of the ligand-binding site and the toxin, in which ImI Arg-7 and Trp-10 play a key role. The toxin also forms interactions in the ligand-binding site that were not seen in the complex of Ac-AChBP with PnIA(A10L D14K), a conotoxin variant that lacks binding selectivity to AChBP homologs. In combination with electrophysiological recordings obtained by using the wild-type alpha7 nAChR and L247T mutant, we show that conotoxin ImI inhibits ion conduction by stabilizing the receptor in a desensitized conformation. Comparison of the Ac-AChBP-ImI crystal structure with existing AChBP structures offers structural insight into the extent of flexibility of the interface loops and how their movement may couple ligand binding to channel gating in the context of a nAChR. | |||
Structural determinants of selective alpha-conotoxin binding to a nicotinic acetylcholine receptor homolog AChBP.,Ulens C, Hogg RC, Celie PH, Bertrand D, Tsetlin V, Smit AB, Sixma TK Proc Natl Acad Sci U S A. 2006 Mar 7;103(10):3615-20. Epub 2006 Feb 27. PMID:16505382<ref>PMID:16505382</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2c9t" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Acetylcholine binding protein 3D structures|Acetylcholine binding protein 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Aplysia californica]] | [[Category: Aplysia californica]] | ||
[[Category: Conus imperialis]] | [[Category: Conus imperialis]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Bertrand | [[Category: Bertrand D]] | ||
[[Category: Celie | [[Category: Celie PH]] | ||
[[Category: Hogg | [[Category: Hogg RC]] | ||
[[Category: Sixma | [[Category: Sixma TK]] | ||
[[Category: Smit | [[Category: Smit AB]] | ||
[[Category: Tsetlin | [[Category: Tsetlin V]] | ||
[[Category: Ulens | [[Category: Ulens C]] | ||
Latest revision as of 17:10, 13 December 2023
Crystal Structure Of Acetylcholine Binding Protein (AChBP) From Aplysia Californica In Complex With alpha-Conotoxin ImICrystal Structure Of Acetylcholine Binding Protein (AChBP) From Aplysia Californica In Complex With alpha-Conotoxin ImI
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe nicotinic acetylcholine receptor (nAChR) is the prototype member of the superfamily of pentameric ligand-gated ion channels. How the extracellular ligand-binding domain coordinates selective binding of ligand molecules to different subtypes of the receptor is unknown at the structural level. Here, we present the 2.2-A crystal structure of a homolog of the ligand-binding domain of the nAChR, Aplysia californica AChBP (Ac-AChBP), in complex with alpha-conotoxin ImI. This conotoxin is unique in its selectivity toward the neuronal alpha3beta2 and alpha7 nAChR, a feature that is reflected in its selective binding to Ac-AChBP compared with other AChBP homologs. We observe a network of interactions between the residues of the ligand-binding site and the toxin, in which ImI Arg-7 and Trp-10 play a key role. The toxin also forms interactions in the ligand-binding site that were not seen in the complex of Ac-AChBP with PnIA(A10L D14K), a conotoxin variant that lacks binding selectivity to AChBP homologs. In combination with electrophysiological recordings obtained by using the wild-type alpha7 nAChR and L247T mutant, we show that conotoxin ImI inhibits ion conduction by stabilizing the receptor in a desensitized conformation. Comparison of the Ac-AChBP-ImI crystal structure with existing AChBP structures offers structural insight into the extent of flexibility of the interface loops and how their movement may couple ligand binding to channel gating in the context of a nAChR. Structural determinants of selective alpha-conotoxin binding to a nicotinic acetylcholine receptor homolog AChBP.,Ulens C, Hogg RC, Celie PH, Bertrand D, Tsetlin V, Smit AB, Sixma TK Proc Natl Acad Sci U S A. 2006 Mar 7;103(10):3615-20. Epub 2006 Feb 27. PMID:16505382[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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