View source for 6pw1


==Cytochrome c Oxidase delta 16==
<StructureSection load='6pw1' size='340' side='right'caption='[[6pw1]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6pw1]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Cereibacter_sphaeroides_2.4.1 Cereibacter sphaeroides 2.4.1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6PW1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6PW1 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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=DMU:DECYL-BETA-D-MALTOPYRANOSIDE'>DMU</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=HEA:HEME-A'>HEA</scene>, <scene name='pdbligand=HTH:(2S,3R)-HEPTANE-1,2,3-TRIOL'>HTH</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PRD_900001:alpha-maltose'>PRD_900001</scene>, <scene name='pdbligand=TRD:TRIDECANE'>TRD</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=6pw1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6pw1 OCA], [https://pdbe.org/6pw1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6pw1 RCSB], [https://www.ebi.ac.uk/pdbsum/6pw1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6pw1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q3J5A7_CERS4 Q3J5A7_CERS4] Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits 1-3 form the functional core of the enzyme complex. CO I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit 2 and heme A of subunit 1 to the bimetallic center formed by heme A3 and copper B.[RuleBase:RU363061]
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== Publication Abstract from PubMed ==
Data from earlier studies showed that minor structural changes at the surface of cytochrome c oxidase, near one of the proton-input pathways (the D pathway), result in dramatically decreased activity and a lower proton-pumping stoichiometry. To further investigate how changes around the D pathway orifice influence functionality of the enzyme, here we modified the nearby C-terminal loop of subunit I of the Rhodobacter sphaeroides cytochrome c oxidase. Removal of 16 residues form this flexible surface loop resulted in a decrease in the proton-pumping stoichiometry to &lt;50% of that of the wild-type enzyme. Replacement of the protonatable residue Glu552, part of the same loop, by an Ala, resulted in a similar decrease in the proton-pumping stoichiometry without loss of the O2-reduction activity or changes in the proton-uptake kinetics. The data show that minor structural changes at the orifice of the D pathway, at a distance of ~40A from the proton gate of cytochrome c oxidase, may alter the proton-pumping stoichiometry of the enzyme.

Structural changes at the surface of cytochrome c oxidase alter the proton-pumping stoichiometry.,Berg J, Liu J, Svahn E, Ferguson-Miller S, Brzezinski P Biochim Biophys Acta Bioenerg. 2019 Nov 13:148116. doi:, 10.1016/j.bbabio.2019.148116. PMID:31733183<ref>PMID:31733183</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 6pw1" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cytochrome c oxidase 3D structures|Cytochrome c oxidase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Cereibacter sphaeroides 2 4.1]]
[[Category: Large Structures]]
[[Category: Ferguson-Miller S]]
[[Category: Liu J]]