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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[7x7m]] is a 60 chain structure with sequence from [https://en.wikipedia.org/wiki/Aquifex_aeolicus_VF5 Aquifex aeolicus VF5]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7X7M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7X7M FirstGlance]. <br>
<table><tr><td colspan='2'>[[7x7m]] is a 60 chain structure with sequence from [https://en.wikipedia.org/wiki/Aquifex_aeolicus_VF5 Aquifex aeolicus VF5]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7X7M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7X7M FirstGlance]. <br>
</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=7x7m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7x7m OCA], [https://pdbe.org/7x7m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7x7m RCSB], [https://www.ebi.ac.uk/pdbsum/7x7m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7x7m ProSAT]</span></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.33&#8491;</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=7x7m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7x7m OCA], [https://pdbe.org/7x7m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7x7m RCSB], [https://www.ebi.ac.uk/pdbsum/7x7m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7x7m 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>  
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== Publication Abstract from PubMed ==
Thermostable enzymes have the potential for use in a wide variety of biotechnological applications. Cryo-electron microscopy (cryo-EM) enables the imaging of biomolecules in their native aqueous environment. Here, we present high resolution cryo-EM structures of two thermostable enzymes that exhibit multimeric cage-like structures arranged into two different point-group symmetries. First, we determined the structure of the Sulfur Oxygenase Reductase (SOR) enzyme that catalyzes both the oxygenation and disproportionation of elemental sulfur in Archea and is composed of 24 homomeric units each of MW approximately 35 kDa arranged in octahedral symmetry. The structure of SOR from Acidianus ambivalens (7X9W) was determined at 2.78 A resolution. The active site of each subunit inside the central nanocompartment is composed of Fe3+ coordinated to two water molecules and the three amino acids (H86, H90 and E114). Second, we determined the structure of Lumazine Synthase (LS) from Aquifex aeolicus (7X7M) at 2.33 A resolution. LS forms a cage-like structure consisting of 60 identical subunits each of MW approximately 15 kDa arranged in a strict icosahedral symmetry. The LS subunits are interconnected by ion-pair network. Due to their thermostability and relatively easy purification scheme, both SOR and LS can serve as a model for the catalytic and structural characterization of biocatalysts as well as a benchmark for cryo-EM sample preparation, optimization of the acquisition parameters and 3D reconstruction.
Cryo-electron structures of the extreme thermostable enzymes Sulfur Oxygenase Reductase and Lumazine Synthase.,Sobhy MA, Zhao L, Anjum D, Behzad A, Takahashi M, Tehseen M, Biasio A, Sougrat R, Hamdan S PLoS One. 2022 Oct 3;17(10):e0275487. doi: 10.1371/journal.pone.0275487., eCollection 2022. PMID:36191023<ref>PMID:36191023</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 7x7m" style="background-color:#fffaf0;"></div>
== References ==
== References ==
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