1qw7

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(New page: 200px<br /><applet load="1qw7" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qw7, resolution 1.90&Aring;" /> '''Structure of an Engi...)
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[[Image:1qw7.jpg|left|200px]]<br /><applet load="1qw7" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1qw7, resolution 1.90&Aring;" />
 
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'''Structure of an Engineered Organophosphorous Hydrolase with Increased Activity Toward Hydrolysis of Phosphothiolate Bonds'''<br />
 
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==About this Structure==
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==Structure of an Engineered Organophosphorous Hydrolase with Increased Activity Toward Hydrolysis of Phosphothiolate Bonds==
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1QW7 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Brevundimonas_diminuta Brevundimonas diminuta] with CO, NA and EBP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1QW7 OCA].
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<StructureSection load='1qw7' size='340' side='right'caption='[[1qw7]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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[[Category: Aryldialkylphosphatase]]
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== Structural highlights ==
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[[Category: Brevundimonas diminuta]]
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<table><tr><td colspan='2'>[[1qw7]] is a 2 chain structure with sequence from [https://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 [https://proteopedia.org/fgij/fg.htm?mol=1QW7 FirstGlance]. <br>
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[[Category: Single protein]]
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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[[Category: Grimsley, J.K.]]
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CO:COBALT+(II)+ION'>CO</scene>, <scene name='pdbligand=EBP:DIETHYL+4-METHYLBENZYLPHOSPHONATE'>EBP</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>
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[[Category: Holton, T.]]
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qw7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qw7 OCA], [https://pdbe.org/1qw7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qw7 RCSB], [https://www.ebi.ac.uk/pdbsum/1qw7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qw7 ProSAT]</span></td></tr>
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[[Category: Mesecar, A.D.]]
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</table>
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[[Category: Wild, J.R.]]
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== Function ==
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[[Category: CO]]
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[https://www.uniprot.org/uniprot/OPD_BREDI OPD_BREDI] Has an unusual substrate specificity for synthetic organophosphate triesters and phosphorofluoridates. All of the phosphate triesters found to be substrates are synthetic compounds. The identity of any naturally occurring substrate for the enzyme is unknown. Has no detectable activity with phosphate monoesters or diesters and no activity as an esterase or protease. It catalyzes the hydrolysis of the insecticide paraoxon at a rate approaching the diffusion limit and thus appears to be optimally evolved for utilizing this synthetic substrate.
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[[Category: EBP]]
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== Evolutionary Conservation ==
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[[Category: NA]]
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[[Image:Consurf_key_small.gif|200px|right]]
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[[Category: 4-methylbenzylphosphonate]]
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Check<jmol>
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[[Category: mutant]]
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<jmolCheckbox>
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[[Category: organophosphorous hydrolase]]
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qw/1qw7_consurf.spt"</scriptWhenChecked>
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[[Category: phosphotriesterase]]
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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[[Category: rvx]]
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<text>to colour the structure by Evolutionary Conservation</text>
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[[Category: vx]]
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</jmolCheckbox>
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</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=1qw7 ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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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.
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 01:03:19 2007''
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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>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 1qw7" style="background-color:#fffaf0;"></div>
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==See Also==
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*[[Phosphotriesterase 3D structures|Phosphotriesterase 3D structures]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Brevundimonas diminuta]]
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[[Category: Large Structures]]
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[[Category: Grimsley JK]]
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[[Category: Holton T]]
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[[Category: Mesecar AD]]
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[[Category: Wild JR]]

Current revision

Structure of an Engineered Organophosphorous Hydrolase with Increased Activity Toward Hydrolysis of Phosphothiolate Bonds

PDB ID 1qw7

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