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[[Image:1cyw.jpg|left|200px]]<br /><applet load="1cyw" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1cyw, resolution 2.5&Aring;" />
'''QUINOL OXIDASE (PERIPLASMIC FRAGMENT OF SUBUNIT II) (CYOA)'''<br />


==Overview==
==QUINOL OXIDASE (PERIPLASMIC FRAGMENT OF SUBUNIT II) (CYOA)==
Cytochrome oxidase is a membrane protein complex that catalyzes reduction of molecular oxygen to water and utilizes the free energy of this reaction to generate a transmembrane proton gradient during respiration. The electron entry site in subunit II is a mixed-valence dinuclear copper center in enzymes that oxidize cytochrome c. This center has been lost during the evolution of the quinoloxidizing branch of cytochrome oxidases but can be restored by engineering. Herein we describe the crystal structures of the periplasmic fragment from the wild-type subunit II (CyoA) of Escherichia coli quinol oxidase at 2.5-A resolution and of the mutant with the engineered dinuclear copper center (purple CyoA) at 2.3-A resolution. CyoA is folded as an 11-stranded mostly antiparallel beta-sandwich followed by three alpha-helices. The dinuclear copper center is located at the loops between strands beta 5-beta 6 and beta 9-beta 10. The two coppers are at a 2.5-A distance and symmetrically coordinated to the main ligands that are two bridging cysteines and two terminal histidines. The residues that are distinct in cytochrome c and quinol oxidases are around the dinuclear copper center. Structural comparison suggests a common ancestry for subunit II of cytochrome oxidase and blue copper-binding proteins.
<StructureSection load='1cyw' size='340' side='right'caption='[[1cyw]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[1cyw]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CYW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CYW FirstGlance]. <br>
1CYW is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CYW OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.5&#8491;</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=1cyw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cyw OCA], [https://pdbe.org/1cyw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cyw RCSB], [https://www.ebi.ac.uk/pdbsum/1cyw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cyw ProSAT]</span></td></tr>
==Reference==
</table>
Crystal structure of the membrane-exposed domain from a respiratory quinol oxidase complex with an engineered dinuclear copper center., Wilmanns M, Lappalainen P, Kelly M, Sauer-Eriksson E, Saraste M, Proc Natl Acad Sci U S A. 1995 Dec 19;92(26):11955-9. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8618822 8618822]
== Function ==
[https://www.uniprot.org/uniprot/CYOA_ECOLI CYOA_ECOLI] Cytochrome bo(3) ubiquinol terminal oxidase is the component of the aerobic respiratory chain of E.coli that predominates when cells are grown at high aeration. Has proton pump activity across the membrane in addition to electron transfer, pumping 2 protons/electron.<ref>PMID:6308657</ref> <ref>PMID:19542282</ref> <ref>PMID:22843529</ref>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cy/1cyw_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1cyw ConSurf].
<div style="clear:both"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Kelly, M.]]
[[Category: Kelly M]]
[[Category: Lappalainen, P.]]
[[Category: Lappalainen P]]
[[Category: Saraste, M.]]
[[Category: Saraste M]]
[[Category: Sauer-Eriksson, E.]]
[[Category: Sauer-Eriksson E]]
[[Category: Wilmanns, M.]]
[[Category: Wilmanns M]]
[[Category: electron transport]]
 
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Retrieved from "https://proteopedia.org/1cyw"