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1s3d

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(New page: 200px<br /><applet load="1s3d" size="450" color="white" frame="true" align="right" spinBox="true" caption="1s3d, resolution 1.54&Aring;" /> '''ARSENATE REDUCTASE R...)
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[[Image:1s3d.gif|left|200px]]<br /><applet load="1s3d" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1s3d, resolution 1.54&Aring;" />
 
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'''ARSENATE REDUCTASE R60A MUTANT FROM E. COLI'''<br />
 
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==Overview==
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==ARSENATE REDUCTASE R60A MUTANT FROM E. COLI==
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Arsenic is a ubiquitous environmental toxic metal. Consequently, organisms, detoxify arsenate by reduction to arsenite, which is then excreted or, sequestered. The ArsC arsenate reductase from Escherichia coli plasmid, R773, the best characterized arsenic-modifying enzyme, has a catalytic, cysteine, Cys 12, in the active site, surrounded by an arginine triad, composed of Arg 60, Arg 94, and Arg 107. During the reaction cycle, the, native enzyme forms a unique monohydroxyl Cys 12-thiol-arsenite adduct, that contains a positive charge on the arsenic. We hypothesized previously, that this unstable intermediate allows for rapid dissociation of the, product arsenite. In this study, the role of Arg 60 in product formation, was evaluated by mutagenesis. A total of eight new structures of ArsC were, determined at resolutions between 1.3 A and 1.8 A, with R(free) values, between 0.18 and 0.25. The crystal structures of R60K and R60A ArsC, equilibrated with the product arsenite revealed a covalently bound Cys, 12-thiol-dihydroxyarsenite without a charge on the arsenic atom. We, propose that this intermediate is more stable than the monohydroxyarsenite, intermediate of the native enzyme, resulting in slow release of product, and, consequently, loss of activity.
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<StructureSection load='1s3d' size='340' side='right'caption='[[1s3d]], [[Resolution|resolution]] 1.54&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1s3d]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S3D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1S3D FirstGlance]. <br>
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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]] 1.54&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CS:CESIUM+ION'>CS</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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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=1s3d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s3d OCA], [https://pdbe.org/1s3d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1s3d RCSB], [https://www.ebi.ac.uk/pdbsum/1s3d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1s3d ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/ARSC1_ECOLX ARSC1_ECOLX] Reduction of arsenate [As(V)] to arsenite [As(III)]. This protein expands the substrate specificity of ArsAB pump which can extrude arsenite and antimonite to allow for arsenate pumping and resistance.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/s3/1s3d_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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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=1s3d ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1S3D is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with SO4 and CS as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Arsenate_reductase_(glutaredoxin) Arsenate reductase (glutaredoxin)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.20.4.1 1.20.4.1] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1S3D OCA].
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*[[Arsenate reductase 3D structures|Arsenate reductase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Arginine 60 in the ArsC arsenate reductase of E. coli plasmid R773 determines the chemical nature of the bound As(III) product., DeMel S, Shi J, Martin P, Rosen BP, Edwards BF, Protein Sci. 2004 Sep;13(9):2330-40. Epub 2004 Aug 4. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15295115 15295115]
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[[Category: Arsenate reductase (glutaredoxin)]]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Demel, S.]]
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[[Category: Demel S]]
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[[Category: Edwards, B.F.]]
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[[Category: Edwards BF]]
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[[Category: CS]]
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[[Category: SO4]]
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[[Category: arsc]]
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[[Category: arsenate]]
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[[Category: arsenite]]
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[[Category: reductase]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 02:04:13 2007''
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Current revision

ARSENATE REDUCTASE R60A MUTANT FROM E. COLI

PDB ID 1s3d

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