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[[Image:1tmx.gif|left|200px]]<br /><applet load="1tmx" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1tmx, resolution 1.75&Aring;" />
'''Crystal structure of hydroxyquinol 1,2-dioxygenase from Nocardioides Simplex 3E'''<br />


==Overview==
==Crystal structure of hydroxyquinol 1,2-dioxygenase from Nocardioides Simplex 3E==
Hydroxyquinol 1,2-dioxygenase (1,2-HQD) catalyzes the ring cleavage of hydroxyquinol (1,2,4-trihydroxybenzene), a central intermediate in the degradation of aromatic compounds including a variety of particularly recalcitrant polychloro- and nitroaromatic pollutants. We report here the primary sequence determination and the analysis of the crystal structure of the 1,2-HQD from Nocardioides simplex 3E solved at 1.75 A resolution using the multiple wavelength anomalous dispersion of the two catalytic irons (1 Fe/293 amino acids). The catalytic Fe(III) coordination polyhedron composed by the side chains of Tyr164, Tyr197, His221, and His223 resembles that of the other known intradiol-cleaving dioxygenases, but several of the tertiary structure features are notably different. One of the most distinctive characteristics of the present structure is the extensive openings and consequent exposure to solvent of the upper part of the catalytic cavity arranged to favor the binding of hydroxyquinols but not catechols. A co-crystallized benzoate-like molecule is also found bound to the metal center forming a distinctive hydrogen bond network as observed previously also in 4-chlorocatechol 1,2-dioxygenase from Rhodococcus opacus 1CP. This is the first structure of an intradiol dioxygenase specialized in hydroxyquinol ring cleavage to be investigated in detail.
<StructureSection load='1tmx' size='340' side='right'caption='[[1tmx]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1tmx]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pimelobacter_simplex Pimelobacter simplex]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TMX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1TMX 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BEZ:BENZOIC+ACID'>BEZ</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=HGX:1-HEPTADECANOYL-2-TRIDECANOYL-3-GLYCEROL-PHOSPHONYL+CHOLINE'>HGX</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1tmx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1tmx OCA], [https://pdbe.org/1tmx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1tmx RCSB], [https://www.ebi.ac.uk/pdbsum/1tmx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1tmx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CHQB_NOCSI CHQB_NOCSI] Catalyzes the ortho-cleavage of the aromatic ring of hydroxyquinol.
== 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/tm/1tmx_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/main_output.php?pdb_ID=1tmx ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1TMX is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pimelobacter_simplex Pimelobacter simplex] with <scene name='pdbligand=FE:'>FE</scene>, <scene name='pdbligand=CU:'>CU</scene>, <scene name='pdbligand=CL:'>CL</scene>, <scene name='pdbligand=SO4:'>SO4</scene>, <scene name='pdbligand=HGX:'>HGX</scene> and <scene name='pdbligand=BEZ:'>BEZ</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Hydroxyquinol_1,2-dioxygenase Hydroxyquinol 1,2-dioxygenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.13.11.37 1.13.11.37] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1TMX OCA].
*[[Dioxygenase 3D structures|Dioxygenase 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Crystal structure of the hydroxyquinol 1,2-dioxygenase from Nocardioides simplex 3E, a key enzyme involved in polychlorinated aromatics biodegradation., Ferraroni M, Seifert J, Travkin VM, Thiel M, Kaschabek S, Scozzafava A, Golovleva L, Schlomann M, Briganti F, J Biol Chem. 2005 Jun 3;280(22):21144-54. Epub 2005 Mar 16. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15772073 15772073]
[[Category: Large Structures]]
[[Category: Hydroxyquinol 1,2-dioxygenase]]
[[Category: Pimelobacter simplex]]
[[Category: Pimelobacter simplex]]
[[Category: Single protein]]
[[Category: Briganti F]]
[[Category: Briganti, F.]]
[[Category: Ferraroni M]]
[[Category: Ferraroni, M.]]
[[Category: Golovleva L]]
[[Category: Golovleva, L.]]
[[Category: Schlomann M]]
[[Category: Schlomann, M.]]
[[Category: Scozzafava A]]
[[Category: Scozzafava, A.]]
[[Category: Seifert J]]
[[Category: Seifert, J.]]
[[Category: Travkin VM]]
[[Category: Travkin, V M.]]
[[Category: BEZ]]
[[Category: CL]]
[[Category: CU]]
[[Category: FE]]
[[Category: HGX]]
[[Category: SO4]]
[[Category: beta barrel]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:15:16 2008''

Latest revision as of 11:40, 14 February 2024

Crystal structure of hydroxyquinol 1,2-dioxygenase from Nocardioides Simplex 3ECrystal structure of hydroxyquinol 1,2-dioxygenase from Nocardioides Simplex 3E

Structural highlights

1tmx is a 2 chain structure with sequence from Pimelobacter simplex. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.75Å
Ligands:, , , , ,
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CHQB_NOCSI Catalyzes the ortho-cleavage of the aromatic ring of hydroxyquinol.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

1tmx, resolution 1.75Å

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