3c79: Difference between revisions
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<StructureSection load='3c79' size='340' side='right'caption='[[3c79]], [[Resolution|resolution]] 2.48Å' scene=''> | <StructureSection load='3c79' size='340' side='right'caption='[[3c79]], [[Resolution|resolution]] 2.48Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[3c79]] is a 5 chain structure with sequence from [ | <table><tr><td colspan='2'>[[3c79]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Aplysia_californica Aplysia californica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3C79 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3C79 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IM4:(2E)-1-[(6-CHLOROPYRIDIN-3-YL)METHYL]-N-NITROIMIDAZOLIDIN-2-IMINE'>IM4</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene> | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.48Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=IM4:(2E)-1-[(6-CHLOROPYRIDIN-3-YL)METHYL]-N-NITROIMIDAZOLIDIN-2-IMINE'>IM4</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3c79 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3c79 OCA], [https://pdbe.org/3c79 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3c79 RCSB], [https://www.ebi.ac.uk/pdbsum/3c79 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3c79 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/Q8WSF8_APLCA Q8WSF8_APLCA] | |||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
[[Image:Consurf_key_small.gif|200px|right]] | [[Image:Consurf_key_small.gif|200px|right]] | ||
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[[Category: Aplysia californica]] | [[Category: Aplysia californica]] | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Casida | [[Category: Casida JE]] | ||
[[Category: Harel | [[Category: Harel M]] | ||
[[Category: Hibbs | [[Category: Hibbs RE]] | ||
[[Category: Talley | [[Category: Talley TT]] | ||
[[Category: Taylor | [[Category: Taylor PW]] | ||
[[Category: Tomizawa | [[Category: Tomizawa M]] | ||
Revision as of 15:23, 30 August 2023
Crystal structure of Aplysia californica AChBP in complex with the neonicotinoid imidaclopridCrystal structure of Aplysia californica AChBP in complex with the neonicotinoid imidacloprid
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 PubMedAcetylcholine-binding proteins (AChBPs) from mollusks are suitable structural and functional surrogates of the nicotinic acetylcholine receptors when combined with transmembrane spans of the nicotinic receptor. These proteins assemble as a pentamer with identical ACh binding sites at the subunit interfaces and show ligand specificities resembling those of the nicotinic receptor for agonists and antagonists. A subset of ligands, termed the neonicotinoids, exhibit specificity for insect nicotinic receptors and selective toxicity as insecticides. AChBPs are of neither mammalian nor insect origin and exhibit a distinctive pattern of selectivity for the neonicotinoid ligands. We define here the binding orientation and determinants of differential molecular recognition for the neonicotinoids and classical nicotinoids by estimates of kinetic and equilibrium binding parameters and crystallographic analysis. Neonicotinoid complex formation is rapid and accompanied by quenching of the AChBP tryptophan fluorescence. Comparisons of the neonicotinoids imidacloprid and thiacloprid in the binding site from Aplysia californica AChBP at 2.48 and 1.94 A in resolution reveal a single conformation of the bound ligands with four of the five sites occupied in the pentameric crystal structure. The neonicotinoid electronegative pharmacophore is nestled in an inverted direction compared with the nicotinoid cationic functionality at the subunit interfacial binding pocket. Characteristic of several agonists, loop C largely envelops the ligand, positioning aromatic side chains to interact optimally with conjugated and hydrophobic regions of the neonicotinoid. This template defines the association of interacting amino acids and their energetic contributions to the distinctive interactions of neonicotinoids. Atomic interactions of neonicotinoid agonists with AChBP: molecular recognition of the distinctive electronegative pharmacophore.,Talley TT, Harel M, Hibbs RE, Radic Z, Tomizawa M, Casida JE, Taylor P Proc Natl Acad Sci U S A. 2008 May 27;105(21):7606-11. Epub 2008 May 13. PMID:18477694[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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