5ktt: Difference between revisions
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<StructureSection load='5ktt' size='340' side='right'caption='[[5ktt]], [[Resolution|resolution]] 1.50Å' scene=''> | <StructureSection load='5ktt' size='340' side='right'caption='[[5ktt]], [[Resolution|resolution]] 1.50Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[5ktt]] is a 1 chain structure with sequence from [ | <table><tr><td colspan='2'>[[5ktt]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Pyrococcus_horikoshii_OT3 Pyrococcus horikoshii OT3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5KTT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5KTT FirstGlance]. <br> | ||
</td></tr><tr id=' | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.5Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LMR:(2S)-2-HYDROXYBUTANEDIOIC+ACID'>LMR</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</scene></td></tr> | |||
<tr id=' | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5ktt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ktt OCA], [https://pdbe.org/5ktt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ktt RCSB], [https://www.ebi.ac.uk/pdbsum/5ktt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ktt ProSAT]</span></td></tr> | ||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | |||
</table> | </table> | ||
== Function == | == Function == | ||
[ | [https://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;"> | <div style="background-color:#fffaf0;"> | ||
== Publication Abstract from PubMed == | == Publication Abstract from PubMed == | ||
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</StructureSection> | </StructureSection> | ||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: Pyrococcus horikoshii | [[Category: Pyrococcus horikoshii OT3]] | ||
[[Category: Ealick SE]] | |||
[[Category: Ealick | [[Category: Fenwick MK]] | ||
[[Category: Fenwick | |||
Latest revision as of 13:54, 27 September 2023
Crystal structure of Pyrococcus horikoshii quinolinate synthase (NadA) with bound L-malate and Fe4S4 clusterCrystal structure of Pyrococcus horikoshii quinolinate synthase (NadA) with bound L-malate and Fe4S4 cluster
Structural highlights
FunctionNADA_PYRHO Catalyzes the condensation of iminoaspartate with dihydroxyacetone phosphate to form quinolinate (By similarity). Publication Abstract from PubMedThe 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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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