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[[Image:1qw7.png|left|200px]]
==Structure of an Engineered Organophosphorous Hydrolase with Increased Activity Toward Hydrolysis of Phosphothiolate Bonds==
<StructureSection load='1qw7' size='340' side='right' caption='[[1qw7]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qw7]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Brevundimonas_diminuta Brevundimonas diminuta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QW7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1QW7 FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=EBP:DIETHYL+4-METHYLBENZYLPHOSPHONATE'>EBP</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene><br>
<tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene></td></tr>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1dpm|1dpm]]</td></tr>
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">OPD ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=293 Brevundimonas diminuta])</td></tr>
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aryldialkylphosphatase Aryldialkylphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.8.1 3.1.8.1] </span></td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qw7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qw7 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1qw7 RCSB], [http://www.ebi.ac.uk/pdbsum/1qw7 PDBsum]</span></td></tr>
<table>
== 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/qw/1qw7_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/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Organophosphorus hydrolase detoxifies a broad range of organophosphate pesticides and the chemical warfare agents (CWAs) sarin and VX. Previously, rational genetic engineering produced OPH variants with 30-fold enhancements in the hydrolysis of CWA and their analogs. One interesting variant (H254R) in which the histidine at position 254 was changed to an arginine showed a 4-fold increase in the hydrolysis of demetonS (VX analog), a 14-fold decrease with paraoxon (an insecticide), and a 183-fold decrease with DFP (sarin analog). The three-dimensional structure of this enzyme at 1.9A resolution with the inhibitor, diethyl 4-methylbenzylphosphonate (EBP), revealed that the inhibitor did not bind at the active site, but bound exclusively into a well-defined surface pocket 12 A away from the active site. This structural feature was accompanied by non-competitive inhibition of paraoxon hydrolysis by EBP with H254R, in contrast to the native enzyme, which showed competitive inhibition. These parallel structure-function characteristics identify a functional, allosteric site on the surface of this enzyme.


{{STRUCTURE_1qw7|  PDB=1qw7  |  SCENE=  }}
Structural and mutational studies of organophosphorus hydrolase reveal a cryptic and functional allosteric-binding site.,Grimsley JK, Calamini B, Wild JR, Mesecar AD Arch Biochem Biophys. 2005 Oct 15;442(2):169-79. Epub 2005 Sep 6. PMID:16188223<ref>PMID:16188223</ref>


===Structure of an Engineered Organophosphorous Hydrolase with Increased Activity Toward Hydrolysis of Phosphothiolate Bonds===
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 
</div>
{{ABSTRACT_PUBMED_16188223}}
 
==About this Structure==
[[1qw7]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Brevundimonas_diminuta Brevundimonas diminuta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QW7 OCA].


==See Also==
==See Also==
*[[Phosphotriesterase|Phosphotriesterase]]
*[[Phosphotriesterase|Phosphotriesterase]]
 
== References ==
==Reference==
<references/>
<ref group="xtra">PMID:016188223</ref><references group="xtra"/>
__TOC__
</StructureSection>
[[Category: Aryldialkylphosphatase]]
[[Category: Aryldialkylphosphatase]]
[[Category: Brevundimonas diminuta]]
[[Category: Brevundimonas diminuta]]
Retrieved from "https://proteopedia.org/1qw7"