View source for 6koc


==X-ray Structure of the proton-pumping cytochrome aa3-600 menaquinol oxidase from Bacillus subtilis complexed with 3-iodo-N-oxo-2-heptyl-4-hydroxyquinoline==
<StructureSection load='6koc' size='340' side='right'caption='[[6koc]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6koc]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Bacillus_subtilis Bacillus subtilis] and [https://en.wikipedia.org/wiki/Bacillus_subtilis_subsp._subtilis_str._168 Bacillus subtilis subsp. subtilis str. 168]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6KOC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6KOC 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]] 3.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=HEA:HEME-A'>HEA</scene>, <scene name='pdbligand=IHQ:2-heptyl-3-iodanyl-1-oxidanyl-quinolin-4-one'>IHQ</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=6koc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6koc OCA], [https://pdbe.org/6koc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6koc RCSB], [https://www.ebi.ac.uk/pdbsum/6koc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6koc ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/QOX1_BACSU QOX1_BACSU] Catalyzes quinol oxidation with the concomitant reduction of oxygen to water. Major component for energy conversion during vegetative growth (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Virtually all proton-pumping terminal respiratory oxygen reductases are members of the heme-copper oxidoreductase superfamily. Most of these enzymes use reduced cytochrome c as a source of electrons, but a group of enzymes have evolved to directly oxidize membrane-bound quinols, usually menaquinol or ubiquinol. All of the quinol oxidases have an additional transmembrane helix (TM0) in subunit I that is not present in the related cytochrome c oxidases. The current work reports the 3.6-A-resolution X-ray structure of the cytochrome aa 3 -600 menaquinol oxidase from Bacillus subtilis containing 1 equivalent of menaquinone. The structure shows that TM0 forms part of a cleft to accommodate the menaquinol-7 substrate. Crystals which have been soaked with the quinol-analog inhibitor HQNO (N-oxo-2-heptyl-4-hydroxyquinoline) or 3-iodo-HQNO reveal a single binding site where the inhibitor forms hydrogen bonds to amino acid residues shown previously by spectroscopic methods to interact with the semiquinone state of menaquinone, a catalytic intermediate.

Structure of the cytochrome aa 3 -600 heme-copper menaquinol oxidase bound to inhibitor HQNO shows TM0 is part of the quinol binding site.,Xu J, Ding Z, Liu B, Yi SM, Li J, Zhang Z, Liu Y, Li J, Liu L, Zhou A, Gennis RB, Zhu J Proc Natl Acad Sci U S A. 2020 Jan 14;117(2):872-876. doi:, 10.1073/pnas.1915013117. Epub 2019 Dec 30. PMID:31888984<ref>PMID:31888984</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 6koc" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Bacillus subtilis]]
[[Category: Bacillus subtilis subsp. subtilis str. 168]]
[[Category: Large Structures]]
[[Category: Ding Z]]
[[Category: Gennis RB]]
[[Category: Li J]]
[[Category: Liu B]]
[[Category: Xu J]]
[[Category: Zhu J]]