View source for 3sqg


==Crystal structure of a methyl-coenzyme M reductase purified from Black Sea mats==
<StructureSection load='3sqg' size='340' side='right'caption='[[3sqg]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3sqg]] is a 9 chain structure with sequence from [https://en.wikipedia.org/wiki/Uncultured_archaeon Uncultured archaeon]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SQG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3SQG 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]] 2.1&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0AF:7-HYDROXY-L-TRYPTOPHAN'>0AF</scene>, <scene name='pdbligand=1PE:PENTAETHYLENE+GLYCOL'>1PE</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=COM:1-THIOETHANESULFONIC+ACID'>COM</scene>, <scene name='pdbligand=GL3:THIOGLYCIN'>GL3</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=M43:(17[2]S)-17[2]-METHYLTHIO-COENZYME+F43'>M43</scene>, <scene name='pdbligand=MHO:S-OXYMETHIONINE'>MHO</scene>, <scene name='pdbligand=MHS:N1-METHYLATED+HISTIDINE'>MHS</scene>, <scene name='pdbligand=P6G:HEXAETHYLENE+GLYCOL'>P6G</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TP7:COENZYME+B'>TP7</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=3sqg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sqg OCA], [https://pdbe.org/3sqg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3sqg RCSB], [https://www.ebi.ac.uk/pdbsum/3sqg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3sqg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/D1JBK4_UNCAX D1JBK4_UNCAX] Component of the methyl-coenzyme M reductase (MCR) I that catalyzes the reductive cleavage of methyl-coenzyme M (CoM-S-CH3 or 2-(methylthio)ethanesulfonate) using coenzyme B (CoB or 7-mercaptoheptanoylthreonine phosphate) as reductant which results in the production of methane and the mixed heterodisulfide of CoB and CoM (CoM-S-S-CoB). This is the final step in methanogenesis.[PIRNR:PIRNR000262]
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== Publication Abstract from PubMed ==
The anaerobic oxidation of methane (AOM) with sulphate, an area currently generating great interest in microbiology, is accomplished by consortia of methanotrophic archaea (ANME) and sulphate-reducing bacteria. The enzyme activating methane in methanotrophic archaea has tentatively been identified as a homologue of methyl-coenzyme M reductase (MCR) that catalyses the methane-forming step in methanogenic archaea. Here we report an X-ray structure of the 280 kDa heterohexameric ANME-1 MCR complex. It was crystallized uniquely from a protein ensemble purified from consortia of microorganisms collected with a submersible from a Black Sea mat catalysing AOM with sulphate. Crystals grown from the heterogeneous sample diffract to 2.1 A resolution and consist of a single ANME-1 MCR population, demonstrating the strong selective power of crystallization. The structure revealed ANME-1 MCR in complex with coenzyme M and coenzyme B, indicating the same substrates for MCR from methanotrophic and methanogenic archaea. Differences between the highly similar structures of ANME-1 MCR and methanogenic MCR include a F(430) modification, a cysteine-rich patch and an altered post-translational amino acid modification pattern, which may tune the enzymes for their functions in different biological contexts.

Structure of a methyl-coenzyme M reductase from Black Sea mats that oxidize methane anaerobically.,Shima S, Krueger M, Weinert T, Demmer U, Kahnt J, Thauer RK, Ermler U Nature. 2011 Nov 27. doi: 10.1038/nature10663. PMID:22121022<ref>PMID:22121022</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 3sqg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Uncultured archaeon]]
[[Category: Demmer U]]
[[Category: Ermler U]]
[[Category: Krueger M]]
[[Category: Shima S]]
[[Category: Thauer RK]]
[[Category: Weinert T]]