2e27: Difference between revisions
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==Crystal structure of Fv fragment of anti-ciguatoxin antibody complexed with ABC-ring of ciguatoxin== | ==Crystal structure of Fv fragment of anti-ciguatoxin antibody complexed with ABC-ring of ciguatoxin== | ||
<StructureSection load='2e27' size='340' side='right' caption='[[2e27]], [[Resolution|resolution]] 1.70Å' scene=''> | <StructureSection load='2e27' size='340' side='right' caption='[[2e27]], [[Resolution|resolution]] 1.70Å' scene=''> | ||
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<table><tr><td colspan='2'>[[2e27]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2E27 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2E27 FirstGlance]. <br> | <table><tr><td colspan='2'>[[2e27]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2E27 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2E27 FirstGlance]. <br> | ||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AB0:3,7 6,10 9,14-TRIANHYDRO-2,5,11,12,13-PENTADEOXY-4-O-(METHOXYMETHYL)-L-ARABINO-L-ALLO-TETRADEC-12-ENONIC+ACID'>AB0</scene>, <scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AB0:3,7 6,10 9,14-TRIANHYDRO-2,5,11,12,13-PENTADEOXY-4-O-(METHOXYMETHYL)-L-ARABINO-L-ALLO-TETRADEC-12-ENONIC+ACID'>AB0</scene>, <scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></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=2e27 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2e27 OCA], [http://pdbe.org/2e27 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2e27 RCSB], [http://www.ebi.ac.uk/pdbsum/2e27 PDBsum]</span></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=2e27 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2e27 OCA], [http://pdbe.org/2e27 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2e27 RCSB], [http://www.ebi.ac.uk/pdbsum/2e27 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2e27 ProSAT]</span></td></tr> | ||
</table> | </table> | ||
== Evolutionary Conservation == | == Evolutionary Conservation == | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/e2/2e27_consurf.spt"</scriptWhenChecked> | <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/e2/2e27_consurf.spt"</scriptWhenChecked> | ||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
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==See Also== | ==See Also== | ||
*[[Monoclonal | *[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 09:32, 6 June 2018
Crystal structure of Fv fragment of anti-ciguatoxin antibody complexed with ABC-ring of ciguatoxinCrystal structure of Fv fragment of anti-ciguatoxin antibody complexed with ABC-ring of ciguatoxin
Structural highlights
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 PubMedTo address how proteins recognize polyether toxin compounds, we focused on the interaction between the ABC ring compound of ciguatoxin 3C and its specific antibody, 1C49. Surface plasmon resonance analyses indicated that Escherichia coli-expressed variable domain fragments (Fv) of 1C49 had the high affinity constants and slow dissociation constants typical of antigen-antibody interactions. Linear van't Hoff analyses suggested that the interaction is enthalpy-driven. We resolved the crystal structure of 1C49 Fv bound to ABC ring compound of ciguatoxin 3C at a resolution of 1.7A. The binding pocket of the antibody had many aromatic rings and bound the antigen by shape complementarity typical of hapten-antibody interactions. Three hydrogen bonds and many van der Waals interactions were present. We mutated several residues of the antibody to Ala, and we used surface plasmon resonance to analyze the interactions between the mutated antibodies and the antigen. This analysis identified Tyr-91 and Trp-96 in the light chain as hot spots for the interaction, and other residues made incremental contributions by conferring enthalpic advantages and reducing the dissociation rate constant. Systematic mutation of Tyr-91 indicated that CH-pi and pi-pi interactions between the aromatic ring at this site and the antigen made substantial contributions to the association, and van der Waals interactions inhibited dissociation, suggesting that aromaticity and bulkiness are critical for the specific recognition of polyether compounds by proteins. Critical contribution of aromatic rings to specific recognition of polyether rings. The case of ciguatoxin CTX3C-ABC and its specific antibody 1C49.,Tsumoto K, Yokota A, Tanaka Y, Ui M, Tsumuraya T, Fujii I, Kumagai I, Nagumo Y, Oguri H, Inoue M, Hirama M J Biol Chem. 2008 May 2;283(18):12259-66. Epub 2008 Mar 6. PMID:18326040[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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