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<StructureSection load='1nqw' size='340' side='right'caption='[[1nqw]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
<StructureSection load='1nqw' size='340' side='right'caption='[[1nqw]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1nqw]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/"aquifex_aeolicus"_huber_and_stetter_2001 "aquifex aeolicus" huber and stetter 2001]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NQW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NQW FirstGlance]. <br>
<table><tr><td colspan='2'>[[1nqw]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NQW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NQW FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5YL:5-(6-D-RIBITYLAMINO-2,4(1H,3H)PYRIMIDINEDIONE-5-YL)+PENTYL-1-PHOSPHONIC+ACID'>5YL</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1nqv|1nqv]], [[1nqu|1nqu]], [[1nqx|1nqx]]</div></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5YL:5-(6-D-RIBITYLAMINO-2,4(1H,3H)PYRIMIDINEDIONE-5-YL)+PENTYL-1-PHOSPHONIC+ACID'>5YL</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/6,7-dimethyl-8-ribityllumazine_synthase 6,7-dimethyl-8-ribityllumazine synthase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.5.1.78 2.5.1.78] </span></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=1nqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nqw OCA], [https://pdbe.org/1nqw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nqw RCSB], [https://www.ebi.ac.uk/pdbsum/1nqw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nqw ProSAT]</span></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=1nqw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nqw OCA], [https://pdbe.org/1nqw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1nqw RCSB], [https://www.ebi.ac.uk/pdbsum/1nqw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1nqw ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/RISB_AQUAE RISB_AQUAE]] Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin.<ref>PMID:12603336</ref> <ref>PMID:11237620</ref>
[https://www.uniprot.org/uniprot/RISB_AQUAE RISB_AQUAE] Catalyzes the formation of 6,7-dimethyl-8-ribityllumazine by condensation of 5-amino-6-(D-ribitylamino)uracil with 3,4-dihydroxy-2-butanone 4-phosphate. This is the penultimate step in the biosynthesis of riboflavin.<ref>PMID:12603336</ref> <ref>PMID:11237620</ref>  
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1nqw ConSurf].
</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=1nqw ConSurf].
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<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
6,7-Dimethyl-8-ribityllumazine is the biosynthetic precursor of riboflavin, which, as a coenzyme, plays a vital role in the electron transfer process for energy production in all cellular organisms. The enzymes involved in lumazine biosynthesis have been studied in considerable detail. However, the conclusive mechanism of the reaction catalyzed by lumazine synthase has remained unclear. Here, we report four crystal structures of the enzyme from the hyperthermophilic bacterium Aquifex aeolicus in complex with different inhibitor compounds. The structures were refined at resolutions of 1.72 A, 1.85 A, 2.05 A and 2.2 A, respectively. The inhibitors have been designed in order to mimic the substrate, the putative reaction intermediates and the final product. Structural comparisons of the native enzyme and the inhibitor complexes as well as the kinetic data of single-site mutants of lumazine synthase from Bacillus subtilis showed that several highly conserved residues at the active site, namely Phe22, His88, Arg127, Lys135 and Glu138 are most likely involved in catalysis. A structural model of the catalytic process, which illustrates binding of substrates, enantiomer specificity, proton abstraction/donation, inorganic phosphate elimination, formation of the Schiff base and cyclization is proposed.
A structure-based model of the reaction catalyzed by lumazine synthase from Aquifex aeolicus.,Zhang X, Meining W, Cushman M, Haase I, Fischer M, Bacher A, Ladenstein R J Mol Biol. 2003 Apr 18;328(1):167-82. PMID:12684006<ref>PMID:12684006</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1nqw" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Aquifex aeolicus huber and stetter 2001]]
[[Category: Aquifex aeolicus]]
[[Category: 6,7-dimethyl-8-ribityllumazine synthase]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Bacher, A]]
[[Category: Bacher A]]
[[Category: Cushman, M]]
[[Category: Cushman M]]
[[Category: Fischer, M]]
[[Category: Fischer M]]
[[Category: Haase, I]]
[[Category: Haase I]]
[[Category: Ladenstein, R]]
[[Category: Ladenstein R]]
[[Category: Meining, W]]
[[Category: Meining W]]
[[Category: Zhang, X]]
[[Category: Zhang X]]
[[Category: Aquifex aeolicus]]
[[Category: Catalytic mechanism]]
[[Category: Inhibitor complex]]
[[Category: Lumazine synthase]]
[[Category: Transferase]]
[[Category: Vitamin biosynthesis]]

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