5ktn: Difference between revisions
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==Crystal structure of Pyrococcus horikoshii quinolinate synthase (NadA) with bound dihydroxyacetone phosphate (DHAP) and Fe4S4 cluster== | |||
<StructureSection load='5ktn' size='340' side='right' caption='[[5ktn]], [[Resolution|resolution]] 1.34Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5ktn]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5KTN OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5KTN FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=13P:1,3-DIHYDROXYACETONEPHOSPHATE'>13P</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5ktp|5ktp]], [[5kts|5kts]], [[5ktm|5ktm]], [[5ktt|5ktt]], [[5ktr|5ktr]], [[5kto|5kto]]</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Quinolinate_synthase Quinolinate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.72 2.5.1.72] </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=5ktn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ktn OCA], [http://pdbe.org/5ktn PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5ktn RCSB], [http://www.ebi.ac.uk/pdbsum/5ktn PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5ktn ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://www.uniprot.org/uniprot/NADA_PYRHO NADA_PYRHO]] Catalyzes the condensation of iminoaspartate with dihydroxyacetone phosphate to form quinolinate (By similarity). | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The quinolinate synthase of prokaryotes and photosynthetic eukaryotes, NadA, contains a [4Fe-4S] cluster with unknown function. We report crystal structures of Pyrococcus horikoshii NadA in complex with dihydroxyacetone phosphate (DHAP), iminoaspartate analogues, and quinolinate. DHAP adopts a nearly planar conformation and chelates the [4Fe-4S] cluster via its keto and hydroxyl groups. The active site architecture suggests that the cluster acts as a Lewis acid in enediolate formation, like zinc in class II aldolases. The DHAP and putative iminoaspartate structures suggest a model for a condensed intermediate. The ensemble of structures suggests a two-state system, which may be exploited in early steps. | |||
Crystal Structures of the Iron-Sulfur Cluster-Dependent Quinolinate Synthase in Complex with Dihydroxyacetone Phosphate, Iminoaspartate Analogues, and Quinolinate.,Fenwick MK, Ealick SE Biochemistry. 2016 Jul 22. PMID:27404889<ref>PMID:27404889</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5ktn" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Quinolinate synthase]] | |||
[[Category: Ealick, S E]] | |||
[[Category: Fenwick, M K]] | |||
[[Category: Biosynthetic enzyme]] | |||
[[Category: Dehydratase]] | |||
[[Category: Iron-sulfur cluster]] | |||
[[Category: Substrate complex]] | |||
[[Category: Transferase]] | |||
