View source for 1ehe


==CRYSTAL STRUCTURES OF CYTOCHROME P450NOR AND ITS MUTANTS (SER286 VAL, THR) IN THE FERRIC RESTING STATE AT CRYOGENIC TEMPERATURE: A COMPARATIVE ANALYSIS WITH MONOOXYGENASE CYTOCHROME P450S==
<StructureSection load='1ehe' size='340' side='right' caption='[[1ehe]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ehe]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Fusox Fusox]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EHE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1EHE FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ehf|1ehf]], [[1ehg|1ehg]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Nitric-oxide_reductase_(cytochrome_c) Nitric-oxide reductase (cytochrome c)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.7.2.5 1.7.2.5] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ehe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ehe OCA], [http://pdbe.org/1ehe PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ehe RCSB], [http://www.ebi.ac.uk/pdbsum/1ehe PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ehe ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/NOR_FUSOX NOR_FUSOX]] Nitric oxide reductase which is involved in a dissimilatory reduction of nitrite. Acts as a nitric oxide reductase. Is able to reduce nitrate and nitrite to a gaseous form of N(2)O when oxygen supply is limited or discontinued. May function as a detoxification mechanism.<ref>PMID:2040619</ref> <ref>PMID:12105197</ref>  
== 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/eh/1ehe_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=1ehe ConSurf].
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== Publication Abstract from PubMed ==
Cytochrome P450nor (P450nor) is a heme enzyme isolated from the denitrifying fungus Fusarium oxysporum and catalyzes the NO reduction to N2O. Crystal structures of the wild type and two Ser286 mutants (Ser286--&gt;Val, Ser286--&gt;Thr) of P450nor have been determined for the ferric resting forms at a 1.7 A resolution at cryogenic temperature (100 K). We carried out three comparative analyses: (1) between the structures of P450nor at room temperature and cryogenic temperature, (2) between the structures of P450nor and four monooxygenase P450s, and (3) between the structures of the WT and the Ser286 mutant enzymes of P450nor. Comparison of the charge distribution on the protein surface suggests that proton and electron flow to the heme site is quite different in P450nor than in monooxygenase P450s. On the basis of the mutant structures, it was found that a special hydrogen-bonding network, Wat99-Ser286-Wat39-Asp393-solvent, acts as a proton delivery pathway in NO reduction by P450nor. In addition, the positively charged cluster located beneath the B'-helix is suggested as possible NADH binding site in P450nor, from which the direct two-electron transfer to the heme site allows to generate the characteristic intermediate in the NO reduction. These structural characteristics were not observed in structures of monooxygenase P450s, implying that these are factors determining the unique NO reduction activity of P450nor.

Crystal structures of cytochrome P450nor and its mutants (Ser286--&gt;Val, Thr) in the ferric resting state at cryogenic temperature: a comparative analysis with monooxygenase cytochrome P450s.,Shimizu H, Park S, Lee D, Shoun H, Shiro Y J Inorg Biochem. 2000 Aug 31;81(3):191-205. PMID:11051564<ref>PMID:11051564</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Fusox]]
[[Category: Park, S]]
[[Category: Shimizu, H]]
[[Category: Cytochrome p450nor]]
[[Category: Nitric oxide reductase]]
[[Category: Oxidoreductase]]