View source for 5fex


==HydE from T. maritima in complex with Se-adenosyl-L-selenocysteine (tfinal of the reaction)==
<StructureSection load='5fex' size='340' side='right'caption='[[5fex]], [[Resolution|resolution]] 1.32&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5fex]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermotoga_maritima Thermotoga maritima]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5FEX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5FEX 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]] 1.32&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5AD:5-DEOXYADENOSINE'>5AD</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CPS:3-[(3-CHOLAMIDOPROPYL)DIMETHYLAMMONIO]-1-PROPANESULFONATE'>CPS</scene>, <scene name='pdbligand=MET:METHIONINE'>MET</scene>, <scene name='pdbligand=OTY:2-HYDROXY-L-TYROSINE'>OTY</scene>, <scene name='pdbligand=SEC:SELENOCYSTEINE'>SEC</scene>, <scene name='pdbligand=SF4:IRON/SULFUR+CLUSTER'>SF4</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=5fex FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5fex OCA], [https://pdbe.org/5fex PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5fex RCSB], [https://www.ebi.ac.uk/pdbsum/5fex PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5fex ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HYDE_THEMA HYDE_THEMA] Required for the maturation of the [FeFe]-hydrogenase HydA (By similarity). Catalyzes the reductive cleavage of S-adenosyl-L-methionine (in vitro), suggesting it may contribute to the biosynthesis of an essential sulfur-containing ligand that binds to the hydrogenase active site [2Fe-2S] cluster (PubMed:16137685).[UniProtKB:Q97IK9]<ref>PMID:16137685</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Carbon-sulfur bond formation at aliphatic positions is a challenging reaction that is performed efficiently by radical S-adenosyl-L-methionine (SAM) enzymes. Here we report that 1,3-thiazolidines can act as ligands and substrates for the radical SAM enzyme HydE, which is involved in the assembly of the active site of [FeFe]-hydrogenase. Using X-ray crystallography, in vitro assays and NMR spectroscopy we identified a radical-based reaction mechanism that is best described as the formation of a C-centred radical that concomitantly attacks the sulfur atom of a thioether. To the best of our knowledge, this is the first example of a radical SAM enzyme that reacts directly on a sulfur atom instead of abstracting a hydrogen atom. Using theoretical calculations based on our high-resolution structures we followed the evolution of the electronic structure from SAM through to the formation of S-adenosyl-L-cysteine. Our results suggest that, at least in this case, the widely proposed and highly reactive 5'-deoxyadenosyl radical species that triggers the reaction in radical SAM enzymes is not an isolable intermediate.

Carbon-sulfur bond-forming reaction catalysed by the radical SAM enzyme HydE.,Rohac R, Amara P, Benjdia A, Martin L, Ruffie P, Favier A, Berteau O, Mouesca JM, Fontecilla-Camps JC, Nicolet Y Nat Chem. 2016 May;8(5):491-500. doi: 10.1038/nchem.2490. Epub 2016 Apr 4. PMID:27102684<ref>PMID:27102684</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5fex" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Thermotoga maritima]]
[[Category: Amara P]]
[[Category: Benjdia A]]
[[Category: Berteau O]]
[[Category: Favier A]]
[[Category: Fontecilla-Camps JC]]
[[Category: Martin L]]
[[Category: Mouesca JM]]
[[Category: Nicolet Y]]
[[Category: Rohac R]]
[[Category: Ruffie P]]