View source for 1zlc


==Solution Conformation of alpha-conotoxin PIA==
<StructureSection load='1zlc' size='340' side='right'caption='[[1zlc]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1zlc]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Conus_purpurascens Conus purpurascens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ZLC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ZLC FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=1zlc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1zlc OCA], [https://pdbe.org/1zlc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1zlc RCSB], [https://www.ebi.ac.uk/pdbsum/1zlc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1zlc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CA1A_CONPU CA1A_CONPU] Alpha-conotoxins bind to the nicotinic acetylcholine receptors (nAChR) and inhibit them. This toxin blocks nAChR (alpha-6 or -3/beta-2 or -3 > alpha-3/beta-2 > alpha-3/beta-4). Does not block the muscle nor the major neuronal nAChR alpha-4/beta-2. Discriminates between nAChRs containing alpha-6 and alpha-3 subunits, being selective for alpha-6.<ref>PMID:13679412</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
alpha-Conotoxin PIA is a novel nicotinic acetylcholine receptor (nAChR) antagonist isolated from Conus purpurascens that targets nAChR subtypes containing alpha6 and alpha3 subunits. alpha-conotoxin PIA displays 75-fold higher affinity for rat alpha6/alpha3beta2beta3 nAChRs than for rat alpha3beta2 nAChRs. We have determined the three-dimensional structure of alpha-conotoxin PIA by nuclear magnetic resonance spectroscopy. The alpha-conotoxin PIA has an "omega-shaped" overall topology as other alpha4/7 subfamily conotoxins. Yet, unlike other neuronally targeted alpha4/7-conotoxins, its N-terminal tail Arg1-Asp2-Pro3 protrudes out of its main molecular body because Asp2-Pro3-Cys4-Cys5 forms a stable type I beta-turn. In addition, a kink introduced by Pro15 in the second loop of this toxin provides a distinct steric and electrostatic environment from those in alpha-conotoxins MII and GIC. By comparing the structure of alpha-conotoxin PIA with other functionally related alpha-conotoxins we suggest structural features in alpha-conotoxin PIA that may be associated with its unique receptor recognition profile.

Solution structure of alpha-conotoxin PIA, a novel antagonist of alpha6 subunit containing nicotinic acetylcholine receptors.,Chi SW, Lee SH, Kim DH, Kim JS, Olivera BM, McIntosh JM, Han KH Biochem Biophys Res Commun. 2005 Dec 30;338(4):1990-7. Epub 2005 Nov 7. PMID:16289101<ref>PMID:16289101</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1zlc" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Conus purpurascens]]
[[Category: Large Structures]]
[[Category: Chi S-W]]
[[Category: Han K-H]]
[[Category: Kim D-H]]
[[Category: Kim J-S]]
[[Category: Lee S-H]]
[[Category: McIntosh JM]]
[[Category: Olivera BM]]