View source for 1ep2


==CRYSTAL STRUCTURE OF LACTOCOCCUS LACTIS DIHYDROOROTATE DEHYDROGENASE B COMPLEXED WITH OROTATE==
<StructureSection load='1ep2' size='340' side='right'caption='[[1ep2]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ep2]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Lactococcus_lactis Lactococcus lactis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EP2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EP2 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]] 2.4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=ORO:OROTIC+ACID'>ORO</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=1ep2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ep2 OCA], [https://pdbe.org/1ep2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ep2 RCSB], [https://www.ebi.ac.uk/pdbsum/1ep2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ep2 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PYRDB_LACLM PYRDB_LACLM] Catalyzes the conversion of dihydroorotate to orotate with NAD(+) as electron acceptor. Can not use fumarate as an electron acceptor.<ref>PMID:8021180</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/ep/1ep2_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=1ep2 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: The fourth step and only redox reaction in pyrimidine de novo biosynthesis is catalyzed by the flavoprotein dihydroorotate dehydrogenase (DHOD). Based on their sequences, DHODs are grouped into two major families. Lactococcus lactis is one of the few organisms with two DHODs, A and B, belonging to each of the two subgroups of family 1. The B enzyme (DHODB) is a prototype for DHODs in Gram-positive bacteria that use NAD+ as the second substrate. DHODB is a heterotetramer composed of two different proteins (PyrDB and PyrK) and three different cofactors: FMN, FAD, and a [2Fe-2S] cluster. RESULTS: Crystal structures have been determined for DHODB and its product complex. The DHODB heterotetramer is composed of two closely interacting PyrDB-PyrK dimers with the [2Fe-2S] cluster in their interface centered between the FMN and FAD groups. Conformational changes are observed between the complexed and uncomplexed state of the enzyme for the loop carrying the catalytic cysteine residue and one of the lysines interacting with FMN, which is important for substrate binding. CONCLUSIONS: A dimer of two PyrDB subunits resembling the family 1A enzymes forms the central core of DHODB. PyrK belongs to the NADPH ferredoxin reductase superfamily. The binding site for NAD+ has been deduced from the similarity to these proteins. The orotate binding in DHODB is similar to that in the family 1A enzymes. The close proximity of the three redox centers makes it possible to propose a possible electron transfer pathway involving residues conserved among the family 1B DHODs.

Structure of dihydroorotate dehydrogenase B: electron transfer between two flavin groups bridged by an iron-sulphur cluster.,Rowland P, Norager S, Jensen KF, Larsen S Structure. 2000 Dec 15;8(12):1227-38. PMID:11188687<ref>PMID:11188687</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ep2" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dihydroorotate dehydrogenase 3D structures|Dihydroorotate dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Lactococcus lactis]]
[[Category: Large Structures]]
[[Category: Jensen KF]]
[[Category: Larsen S]]
[[Category: Norager S]]
[[Category: Rowland P]]