View source for 1kqc


==Structure of Nitroreductase from E. cloacae Complex with Inhibitor Acetate==
<StructureSection load='1kqc' size='340' side='right'caption='[[1kqc]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1kqc]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/"aerobacter_cloacae"_(jordan_1890)_bergey_et_al._1923 "aerobacter cloacae" (jordan 1890) bergey et al. 1923]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KQC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KQC FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1kqb|1kqb]], [[1kqd|1kqd]]</div></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=1kqc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kqc OCA], [https://pdbe.org/1kqc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kqc RCSB], [https://www.ebi.ac.uk/pdbsum/1kqc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kqc ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/NFNB_ENTCL NFNB_ENTCL]] Reduction of a variety of nitroaromatic compounds using NADH (and to lesser extent NADPH) as source of reducing equivalents; two electrons are transferred. 
== 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/kq/1kqc_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=1kqc ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of the nitroreductase enzyme from Enterobacter cloacae has been determined for the oxidized form in separate complexes with benzoate and acetate inhibitors and for the two-electron reduced form. Nitroreductase is a member of a group of enzymes that reduce a broad range of nitroaromatic compounds and has potential uses in chemotherapy and bioremediation. The monomers of the nitroreductase dimer adopt an alpha+beta fold and together bind two flavin mononucleotide prosthetic groups at the dimer interface. In the oxidized enzyme, the flavin ring system adopts a strongly bent (16 degrees ) conformation, and the bend increases (25 degrees ) in the reduced form of the enzyme, roughly the conformation predicted for reduced flavin free in solution. Because free oxidized flavin is planar, the induced bend in the oxidized enzyme may favor reduction, and it may also account for the characteristic inability of the enzyme to stabilize the one electron-reduced semiquinone flavin, which is also planar. Both inhibitors bind over the pyrimidine and central rings of the flavin in partially overlapping sites. Comparison of the two inhibitor complexes shows that a portion of helix H6 can flex to accommodate the differently sized inhibitors suggesting a mechanism for accommodating varied substrates.

Structures of nitroreductase in three states: effects of inhibitor binding and reduction.,Haynes CA, Koder RL, Miller AF, Rodgers DW J Biol Chem. 2002 Mar 29;277(13):11513-20. Epub 2002 Jan 22. PMID:11805110<ref>PMID:11805110</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1kqc" style="background-color:#fffaf0;"></div>

==See Also==
*[[Nitroreductase|Nitroreductase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Haynes, C A]]
[[Category: Koder, R L]]
[[Category: Miller, A F]]
[[Category: Rodgers, D W]]
[[Category: Acetate]]
[[Category: Flavin]]
[[Category: Nitroreductase]]
[[Category: Oxidoreductase]]