1xvq

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[[Image:1xvq.gif|left|200px]]<br /><applet load="1xvq" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1xvq, resolution 1.75&Aring;" />
 
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'''Crystal structure of thiol peroxidase from Mycobacterium tuberculosis'''<br />
 
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==Overview==
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==Crystal structure of thiol peroxidase from Mycobacterium tuberculosis==
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A thiol peroxidase (Tpx) from Mycobacterium tuberculosis was functionally analyzed. The enzyme shows NADPH-linked peroxidase activity using a thioredoxin-thioredoxin reductase system as electron donor, and anti-oxidant activity in a thiol-dependent metal-catalyzed oxidation system. It reduces H2O2, t-butyl hydroperoxide, and cumene hydroperoxide, and is inhibited by sulfhydryl reagents. Mutational studies revealed that the peroxidatic (Cys60) and resolving (Cys93) cysteine residues are critical amino acids for catalytic activity. The X-ray structure determined to a resolution of 1.75 A shows a thioredoxin fold similar to that of other peroxiredoxin family members. Superposition with structural homologues in oxidized and reduced forms indicates that the M. tuberculosis Tpx is a member of the atypical two-Cys peroxiredoxin family. In addition, the short distance that separates the Calpha atoms of Cys60 and Cys93 and the location of these cysteine residues in unstructured regions may indicate that the M. tuberculosis enzyme is oxidized, though the side-chain of Cys60 is poorly visible. It is solely in the reduced Streptococcus pneumoniae Tpx structure that both residues are part of two distinct helical segments. The M. tuberculosis Tpx is dimeric both in solution and in the crystal structure. Amino acid residues from both monomers delineate the active site pocket.
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<StructureSection load='1xvq' size='340' side='right'caption='[[1xvq]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1xvq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XVQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XVQ 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]] 1.75&#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=CSX:S-OXY+CYSTEINE'>CSX</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene>, <scene name='pdbligand=YT3:YTTRIUM+(III)+ION'>YT3</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=1xvq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xvq OCA], [https://pdbe.org/1xvq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xvq RCSB], [https://www.ebi.ac.uk/pdbsum/1xvq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xvq ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/TPX_MYCTU TPX_MYCTU] Has antioxidant activity. Could remove peroxides or H(2)O(2) (By similarity).
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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/xv/1xvq_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=1xvq 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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1XVQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis] with <scene name='pdbligand=YT3:'>YT3</scene> and <scene name='pdbligand=NH4:'>NH4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XVQ OCA].
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*[[Thiol peroxidase 3D structures|Thiol peroxidase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Functional and structural characterization of a thiol peroxidase from Mycobacterium tuberculosis., Rho BS, Hung LW, Holton JM, Vigil D, Kim SI, Park MS, Terwilliger TC, Pedelacq JD, J Mol Biol. 2006 Sep 1;361(5):850-63. Epub 2006 Jun 27. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16884737 16884737]
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[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Mycobacterium tuberculosis]]
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[[Category: Single protein]]
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[[Category: Holton JM]]
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[[Category: Holton, J M.]]
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[[Category: Hung LW]]
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[[Category: Hung, L W.]]
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[[Category: Kim SI]]
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[[Category: Kim, S I.]]
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[[Category: Park MS]]
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[[Category: Park, M S.]]
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[[Category: Pedelacq JD]]
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[[Category: Pedelacq, J D.]]
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[[Category: Rho BS]]
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[[Category: Rho, B S.]]
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[[Category: Terwilliger TC]]
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[[Category: TBSGC, TB Structural Genomics Consortium.]]
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[[Category: Vigil D]]
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[[Category: Terwilliger, T C.]]
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[[Category: Vigil, D.]]
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[[Category: NH4]]
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[[Category: YT3]]
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[[Category: protein structure initiative]]
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[[Category: psi]]
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[[Category: structural genomics]]
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[[Category: tb structural genomics consortium]]
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[[Category: tbsgc]]
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[[Category: thioredoxin fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:59:08 2008''
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Current revision

Crystal structure of thiol peroxidase from Mycobacterium tuberculosis

PDB ID 1xvq

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