View source for 1yek


==CATALYTIC ANTIBODY D2.3 COMPLEX==
<StructureSection load='1yek' size='340' side='right'caption='[[1yek]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1yek]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YEK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1YEK 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]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NPO:P-NITROPHENOL'>NPO</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1yek FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yek OCA], [https://pdbe.org/1yek PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1yek RCSB], [https://www.ebi.ac.uk/pdbsum/1yek PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1yek ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q58EU8_MOUSE Q58EU8_MOUSE] 
== 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/ye/1yek_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1yek ConSurf].
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== Publication Abstract from PubMed ==
The antibody D2.3 catalyzes the hydrolysis of several p-nitrobenzyl and p-nitrophenyl esters with significant rate enhancement; product inhibition is observed with the former compounds but not with the latter. Whereas enzyme specificity has been extensively studied by X-ray crystallography, structural data on catalytic antibodies have thus far related only to one of the reactions they catalyze. To investigate the substrate specificity and the substrate relative to product selectivity of D2.3, we have determined the structures of its complexes with two p-nitrophenyl phosphonate transition state analogs (TSAs) and with the reaction product, p-nitrophenol. The complexes with these TSAs, determined at 1.9 A resolution, and that with p-nitrobenzyl phosphonate determined previously, differ mainly by the locations and conformations of the ligands. Taken together with kinetic data, the structures suggest that a hydrogen bond to an atom of the substrate distant by eight covalent bonds from the carbonyl group of the hydrolyzed ester bond contributes to catalytic efficiency and substrate specificity. The structure of Fab D2.3 complexed with p-nitrophenol was determined at 2.1 A resolution. Release of p-nitrophenol is facilitated due to the unfavourable interaction of the partial charge of the nitro group of p-nitrophenolate with the hydrophobic cavity where it is located, and to the absence of a direct hydrogen bond between the product and the Fab. Catalytic specificity and the manner of product release are both affected by interactions with substrate atoms remote from the reaction center that were not programmed in the design of the TSA used to elicit this antibody. Selection of a catalytic antibody that makes use of TSA unprogrammed features has been made practical because of the screening for catalytic efficiency incorporated in the procedure used to obtain it.

Crossreactivity, efficiency and catalytic specificity of an esterase-like antibody.,Gigant B, Charbonnier JB, Eshhar Z, Green BS, Knossow M J Mol Biol. 1998 Dec 4;284(3):741-50. PMID:9826512<ref>PMID:9826512</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1yek" style="background-color:#fffaf0;"></div>

==See Also==
*[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Gigant B]]
[[Category: Knossow M]]