View source for 1jqv

==The K213E mutant of Lactococcus lactis Dihydroorotate dehydrogenase A==
<StructureSection load='1jqv' size='340' side='right' caption='[[1jqv]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1jqv]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacterium_lactis"_lister_1873 "bacterium lactis" lister 1873]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JQV OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JQV FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=ORO:OROTIC+ACID'>ORO</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1dor|1dor]], [[2dor|2dor]], [[1jqx|1jqx]], [[1jrb|1jrb]], [[1jrc|1jrc]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Dihydroorotate_oxidase_(fumarate) Dihydroorotate oxidase (fumarate)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.3.98.1 1.3.98.1] </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=1jqv FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jqv OCA], [http://pdbe.org/1jqv PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1jqv RCSB], [http://www.ebi.ac.uk/pdbsum/1jqv PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PYRDA_LACLC PYRDA_LACLC]] Catalyzes the conversion of dihydroorotate to orotate with fumarate as the electron acceptor (By similarity). 
== 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/jq/1jqv_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=1jqv ConSurf].
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== Publication Abstract from PubMed ==
Dihydroorotate dehydrogenases (DHODs) are flavoenzymes catalyzing the oxidation of (S)-dihydroorotate to orotate in the biosynthesis of UMP, the precursor of all other pyrimidine nucleotides. On the basis of sequence, DHODs can be divided into two classes, class 1, further divided in subclasses 1A and 1B, and class 2. This division corresponds to differences in cellular location and the nature of the electron acceptor. Herein we report a study of Lactococcus lactis DHODA, a representative of the class 1A enzymes. Based on the DHODA structure we selected seven residues that are highly conserved between both main classes of DHODs as well as three residues representing surface charges close to the active site for site-directed mutagenesis. The availability of both kinetic and structural data on the mutant enzymes allowed us to define the roles individual structural segments play in catalysis. We have also structurally proven the presence of an open active site loop in DHODA and obtained information about the interactions that control movements of loops around the active site. Furthermore, in one mutant structure we observed differences between the two monomers of the dimer, confirming an apparent asymmetry between the two substrate binding sites that was indicated by the kinetic results.

Lactococcus lactis dihydroorotate dehydrogenase A mutants reveal important facets of the enzymatic function.,Norager S, Arent S, Bjornberg O, Ottosen M, Lo Leggio L, Jensen KF, Larsen S J Biol Chem. 2003 Aug 1;278(31):28812-22. Epub 2003 May 5. PMID:12732650<ref>PMID:12732650</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 1jqv" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dihydroorotate dehydrogenase|Dihydroorotate dehydrogenase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacterium lactis lister 1873]]
[[Category: Arent, S]]
[[Category: Bjornberg, O]]
[[Category: Jensen, K F]]
[[Category: Larsen, S]]
[[Category: Leggio, L Lo]]
[[Category: Norager, S]]
[[Category: Ottosen, M]]
[[Category: Alpha-beta barrel]]
[[Category: Flavoprotein]]
[[Category: Homodimer]]
[[Category: Mutant enzyme]]
[[Category: Orotate complex]]
[[Category: Oxidoreductase]]