View source for 2qfk


==X-ray Crystal Structure Analysis of the Binding Site in the Ferric and Oxyferrous Forms of the Recombinant Heme Dehaloperoxidase Cloned from Amphitrite ornata==
<StructureSection load='2qfk' size='340' side='right'caption='[[2qfk]], [[Resolution|resolution]] 1.62&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2qfk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Amphitrite_ornata Amphitrite ornata]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QFK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2QFK 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]] 1.62&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</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=2qfk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2qfk OCA], [https://pdbe.org/2qfk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2qfk RCSB], [https://www.ebi.ac.uk/pdbsum/2qfk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2qfk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9NAV8_9ANNE Q9NAV8_9ANNE] 
== 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/qf/2qfk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=2qfk ConSurf].
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== Publication Abstract from PubMed ==
The dehaloperoxidase (DHP) from the terebellid polychaete Amphitrite ornata is an enzyme that converts para-halogenated phenols to the corresponding quinones in the presence of hydrogen peroxide. Its enzymatic activity is similar to that of heme peroxidases such as horseradish peroxidase, yet it has the structural characteristics of the globin family of proteins, the main functions of which are oxygen transport and storage. In order to investigate the dual function of this hemoglobin peroxidase, the enzyme was expressed in Escherichia coli as a recombinant protein in its wild-type form and as a mutant protein in which Cys73 was replaced by a serine residue (C73S). Both the wild-type and mutant proteins were crystallized and their structures were determined at 100 K to a resolution of 1.62 A. The structure of the wild-type protein demonstrated that it was in the metaquo form, with the heme iron in the ferric oxidation state and the bound water lying 2.2 A from the heme iron. The structure of the C73S mutant protein was shown to contain a ferrous heme iron with a bound oxygen molecule. The bent bonding geometry of the Fe-O(1)-O(2) adduct results in a hydrogen bond of length 2.8 A between the second O atom, O(2), of molecular oxygen and N(2) of the distal histidine residue (His55) in both subunits contained within the asymmetric unit. This hydrogen-bonding interaction between His55 and the bound diatomic oxygen molecule provides new insight into the catalytic activation of H(2)O(2), which is essential for peroxidase activity.

X-ray crystal structural analysis of the binding site in the ferric and oxyferrous forms of the recombinant heme dehaloperoxidase cloned from Amphitrite ornata.,de Serrano V, Chen Z, Davis MF, Franzen S Acta Crystallogr D Biol Crystallogr. 2007 Oct;63(Pt 10):1094-101. Epub, 2007 Sep 19. PMID:17881827<ref>PMID:17881827</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2qfk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dehaloperoxidase 3D structures|Dehaloperoxidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Amphitrite ornata]]
[[Category: Large Structures]]
[[Category: Chen Z]]
[[Category: Davis MF]]
[[Category: Franzen S]]
[[Category: De Serrano VS]]