View source for 7uur


==The 1.67 Angstrom CryoEM structure of the [NiFe]-hydrogenase Huc from Mycobacterium smegmatis - catalytic dimer (Huc2S2L)==
<StructureSection load='7uur' size='340' side='right'caption='[[7uur]], [[Resolution|resolution]] 1.67&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7uur]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycolicibacterium_smegmatis_MC2_155 Mycolicibacterium smegmatis MC2 155]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7UUR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7UUR FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 1.67&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3NI:NICKEL+(III)+ION'>3NI</scene>, <scene name='pdbligand=DHI:D-HISTIDINE'>DHI</scene>, <scene name='pdbligand=FCO:CARBONMONOXIDE-(DICYANO)+IRON'>FCO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OH:HYDROXIDE+ION'>OH</scene>, <scene name='pdbligand=VK3:MENADIONE'>VK3</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=7uur FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7uur OCA], [https://pdbe.org/7uur PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7uur RCSB], [https://www.ebi.ac.uk/pdbsum/7uur PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7uur ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0QUM6_MYCS2 A0QUM6_MYCS2] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Diverse aerobic bacteria use atmospheric H(2) as an energy source for growth and survival(1). This globally significant process regulates the composition of the atmosphere, enhances soil biodiversity and drives primary production in extreme environments(2,3). Atmospheric H(2) oxidation is attributed to uncharacterized members of the [NiFe] hydrogenase superfamily(4,5). However, it remains unresolved how these enzymes overcome the extraordinary catalytic challenge of oxidizing picomolar levels of H(2) amid ambient levels of the catalytic poison O(2) and how the derived electrons are transferred to the respiratory chain(1). Here we determined the cryo-electron microscopy structure of the Mycobacterium smegmatis hydrogenase Huc and investigated its mechanism. Huc is a highly efficient oxygen-insensitive enzyme that couples oxidation of atmospheric H(2) to the hydrogenation of the respiratory electron carrier menaquinone. Huc uses narrow hydrophobic gas channels to selectively bind atmospheric H(2) at the expense of O(2), and 3 [3Fe-4S] clusters modulate the properties of the enzyme so that atmospheric H(2) oxidation is energetically feasible. The Huc catalytic subunits form an octameric 833 kDa complex around a membrane-associated stalk, which transports and reduces menaquinone 94 A from the membrane. These findings provide a mechanistic basis for the biogeochemically and ecologically important process of atmospheric H(2) oxidation, uncover a mode of energy coupling dependent on long-range quinone transport, and pave the way for the development of catalysts that oxidize H(2) in ambient air.

Structural basis for bacterial energy extraction from atmospheric hydrogen.,Grinter R, Kropp A, Venugopal H, Senger M, Badley J, Cabotaje PR, Jia R, Duan Z, Huang P, Stripp ST, Barlow CK, Belousoff M, Shafaat HS, Cook GM, Schittenhelm RB, Vincent KA, Khalid S, Berggren G, Greening C Nature. 2023 Mar;615(7952):541-547. doi: 10.1038/s41586-023-05781-7. Epub 2023 , Mar 8. PMID:36890228<ref>PMID:36890228</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7uur" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycolicibacterium smegmatis MC2 155]]
[[Category: Greening C]]
[[Category: Grinter R]]
[[Category: Kropp A]]
[[Category: Venugopal H]]