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| - | ==Crystal structure of the Na+-translocating NADH: ubiquinone oxidoreductase from Vibrio cholerae==
| + | #REDIRECT [[8acy]] This PDB entry is obsolete and replaced by 8acy |
| - | <StructureSection load='4p6v' size='340' side='right' caption='[[4p6v]], [[Resolution|resolution]] 3.50Å' scene=''>
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| - | == Structural highlights ==
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| - | <table><tr><td colspan='2'>[[4p6v]] is a 6 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4P6V OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4P6V FirstGlance]. <br>
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| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=FAD:FLAVIN-ADENINE+DINUCLEOTIDE'>FAD</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=FMN:FLAVIN+MONONUCLEOTIDE'>FMN</scene>, <scene name='pdbligand=RBF:RIBOFLAVIN'>RBF</scene></td></tr>
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| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4p6v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4p6v OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4p6v RCSB], [http://www.ebi.ac.uk/pdbsum/4p6v PDBsum]</span></td></tr>
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| - | </table>
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| - | == Function ==
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| - | [[http://www.uniprot.org/uniprot/NQRF_VIBCH NQRF_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. The first step is catalyzed by NqrF, which accepts electrons from NADH and reduces ubiquinone-1 to ubisemiquinone by a one-electron transfer pathway. [[http://www.uniprot.org/uniprot/NQRD_VIBCH NQRD_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are probably involved in the second step, the conversion of ubisemiquinone to ubiquinol. [[http://www.uniprot.org/uniprot/NQRA_VIBCH NQRA_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are probably involved in the second step, the conversion of ubisemiquinone to ubiquinol. [[http://www.uniprot.org/uniprot/NQRC_VIBCH NQRC_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are probably involved in the second step, the conversion of ubisemiquinone to ubiquinol (By similarity). [[http://www.uniprot.org/uniprot/NQRB_VIBCH NQRB_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are probably involved in the second step, the conversion of ubisemiquinone to ubiquinol. [[http://www.uniprot.org/uniprot/NQRE_VIBCH NQRE_VIBCH]] NQR complex catalyzes the reduction of ubiquinone-1 to ubiquinol by two successive reactions, coupled with the transport of Na(+) ions from the cytoplasm to the periplasm. NqrA to NqrE are probably involved in the second step, the conversion of ubisemiquinone to ubiquinol (By similarity).
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| - | <div style="background-color:#fffaf0;">
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| - | == Publication Abstract from PubMed ==
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| - | NADH oxidation in the respiratory chain is coupled to ion translocation across the membrane to build up an electrochemical gradient. The sodium-translocating NADH:quinone oxidoreductase (Na(+)-NQR), a membrane protein complex widespread among pathogenic bacteria, consists of six subunits, NqrA, B, C, D, E and F. To our knowledge, no structural information on the Na(+)-NQR complex has been available until now. Here we present the crystal structure of the Na(+)-NQR complex at 3.5 A resolution. The arrangement of cofactors both at the cytoplasmic and the periplasmic side of the complex, together with a hitherto unknown iron centre in the midst of the membrane-embedded part, reveals an electron transfer pathway from the NADH-oxidizing cytoplasmic NqrF subunit across the membrane to the periplasmic NqrC, and back to the quinone reduction site on NqrA located in the cytoplasm. A sodium channel was localized in subunit NqrB, which represents the largest membrane subunit of the Na(+)-NQR and is structurally related to urea and ammonia transporters. On the basis of the structure we propose a mechanism of redox-driven Na(+) translocation where the change in redox state of the flavin mononucleotide cofactor in NqrB triggers the transport of Na(+) through the observed channel.
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| - | Structure of the V. cholerae Na+-pumping NADH:quinone oxidoreductase.,Steuber J, Vohl G, Casutt MS, Vorburger T, Diederichs K, Fritz G Nature. 2014 Dec 4;516(7529):62-7. doi: 10.1038/nature14003. PMID:25471880<ref>PMID:25471880</ref>
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div>
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| - | == References ==
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| - | <references/>
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| - | __TOC__
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| - | </StructureSection>
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| - | [[Category: Casutt, M S]]
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| - | [[Category: Diederichs, K]]
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| - | [[Category: Fritz, G]]
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| - | [[Category: Steuber, J]]
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| - | [[Category: Vohl, G]]
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| - | [[Category: Vorburger, T]]
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| - | [[Category: Covalent fmn]]
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| - | [[Category: Fad]]
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| - | [[Category: Nadh:ubiquinone oxidoreductase]]
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| - | [[Category: Oxidoreductase]]
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| - | [[Category: Respiratory complex]]
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| - | [[Category: Riboflavin]]
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| - | [[Category: Sodium translocation]]
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