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- EMDB-28877: E. coli cytochrome bo3 ubiquinol oxidase monomer -

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Basic information

Entry
Database: EMDB / ID: EMD-28877
TitleE. coli cytochrome bo3 ubiquinol oxidase monomer
Map data
Sample
  • Complex: E. coli Cytochrome bo3 ubiquinol oxidase monomer
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 1
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 2
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 3
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 4
  • Ligand: PROTOPORPHYRIN IX CONTAINING FE
  • Ligand: HEME O
  • Ligand: COPPER (II) ION
  • Ligand: 1,2-Distearoyl-sn-glycerophosphoethanolamine
Keywordsheme-copper oxidase / proton translocation / E. coli aerobic respiratory chain / membrane protein / PROTON TRANSPORT / Structural Genomics / Center for Structural Biology of Infectious Diseases / CSBID
Function / homology
Function and homology information


oxidoreduction-driven active transmembrane transporter activity / cytochrome o ubiquinol oxidase complex / ubiquinol oxidase (H+-transporting) / cytochrome bo3 ubiquinol oxidase activity / aerobic electron transport chain / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / cytochrome-c oxidase activity / ubiquinone binding / electron transport coupled proton transport / proton transmembrane transporter activity ...oxidoreduction-driven active transmembrane transporter activity / cytochrome o ubiquinol oxidase complex / ubiquinol oxidase (H+-transporting) / cytochrome bo3 ubiquinol oxidase activity / aerobic electron transport chain / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / cytochrome-c oxidase activity / ubiquinone binding / electron transport coupled proton transport / proton transmembrane transporter activity / ATP synthesis coupled electron transport / aerobic respiration / respiratory electron transport chain / electron transfer activity / copper ion binding / heme binding / plasma membrane
Similarity search - Function
: / Cytochrome o ubiquinol oxidase, subunit III / Cytochrome o ubiquinol oxidase subunit IV / Cytochrome o ubiquinol oxidase, subunit I / Ubiquinol oxidase subunit III domain / Cytochrome C oxidase subunit IV, prokaryotes / COX aromatic rich motif / Prokaryotic Cytochrome C oxidase subunit IV / COX Aromatic Rich Motif / Cytochrome o ubiquinol oxidase subunit II ...: / Cytochrome o ubiquinol oxidase, subunit III / Cytochrome o ubiquinol oxidase subunit IV / Cytochrome o ubiquinol oxidase, subunit I / Ubiquinol oxidase subunit III domain / Cytochrome C oxidase subunit IV, prokaryotes / COX aromatic rich motif / Prokaryotic Cytochrome C oxidase subunit IV / COX Aromatic Rich Motif / Cytochrome o ubiquinol oxidase subunit II / Ubiquinol oxidase subunit 2, cupredoxin domain / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / Cytochrome c oxidase subunit III / Cytochrome c oxidase subunit III-like / Cytochrome c oxidase, subunit III, 4-helical bundle / Cytochrome c oxidase subunit III / Heme-copper oxidase subunit III family profile. / Cytochrome c oxidase subunit III-like superfamily / Cytochrome c/quinol oxidase subunit II / Cytochrome C oxidase subunit II, transmembrane domain superfamily / Cytochrome c oxidase, subunit I, copper-binding site / Heme-copper oxidase catalytic subunit, copper B binding region signature. / Cytochrome c oxidase-like, subunit I domain / Cytochrome oxidase subunit I profile. / Cytochrome c oxidase subunit I / Cytochrome c oxidase-like, subunit I superfamily / Cytochrome C and Quinol oxidase polypeptide I / Cytochrome C oxidase subunit II, periplasmic domain / Cytochrome c oxidase subunit II-like C-terminal / Cytochrome oxidase subunit II copper A binding domain profile. / Cupredoxin / Prokaryotic membrane lipoprotein lipid attachment site profile.
Similarity search - Domain/homology
Cytochrome bo(3) ubiquinol oxidase subunit 1 / Cytochrome bo(3) ubiquinol oxidase subunit 2 / Cytochrome bo(3) ubiquinol oxidase subunit 3 / Cytochrome bo(3) ubiquinol oxidase subunit 4
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.15 Å
AuthorsGuo Y / Karimullina E / Borek D / Savchenko A / Center for Structural Biology of Infectious Diseases (CSBID)
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: Protein Sci / Year: 2023
Title: Monomer and dimer structures of cytochrome bo ubiquinol oxidase from Escherichia coli.
Authors: Yirui Guo / Elina Karimullina / Tabitha Emde / Zbyszek Otwinowski / Dominika Borek / Alexei Savchenko /
Abstract: The Escherichia coli cytochrome bo ubiquinol oxidase is a four-subunit heme-copper oxidase that serves as a proton pump in the E. coli aerobic respiratory chain. Despite many mechanistic studies, it ...The Escherichia coli cytochrome bo ubiquinol oxidase is a four-subunit heme-copper oxidase that serves as a proton pump in the E. coli aerobic respiratory chain. Despite many mechanistic studies, it is unclear whether this ubiquinol oxidase functions as a monomer, or as a dimer in a manner similar to its eukaryotic counterparts-the mitochondrial electron transport complexes. In this study, we determined the monomeric and dimeric structures of the E. coli cytochrome bo ubiquinol oxidase reconstituted in amphipol by cryogenic electron microscopy single particle reconstruction (cryo-EM SPR) to a resolution of 3.15 and 3.46 Å, respectively. We have discovered that the protein can form a dimer with C2 symmetry, with the dimerization interface maintained by interactions between the subunit II of one monomer and the subunit IV of the other monomer. Moreover, the dimerization does not induce significant structural changes in the monomers, except the movement of a loop in subunit IV (residues 67-74).
History
DepositionNov 16, 2022-
Header (metadata) releaseNov 30, 2022-
Map releaseNov 30, 2022-
UpdateSep 17, 2025-
Current statusSep 17, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28877.png

Downloads & links

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Map

FileDownload / File: emd_28877.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 400 pix.
= 333.6 Å		0.83 Å/pix.
x 400 pix.
= 333.6 Å		0.83 Å/pix.
x 400 pix.
= 333.6 Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.834 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.095
Minimum - Maximum-0.20522274 - 0.44581774
Average (Standard dev.)0.00004124984 (±0.00920369)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 333.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_28877_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_28877_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : E. coli Cytochrome bo3 ubiquinol oxidase monomer

EntireName: E. coli Cytochrome bo3 ubiquinol oxidase monomer
Components
  • Complex: E. coli Cytochrome bo3 ubiquinol oxidase monomer
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 1
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 2
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 3
    • Protein or peptide: Cytochrome bo(3) ubiquinol oxidase subunit 4
  • Ligand: PROTOPORPHYRIN IX CONTAINING FE
  • Ligand: HEME O
  • Ligand: COPPER (II) ION
  • Ligand: 1,2-Distearoyl-sn-glycerophosphoethanolamine

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Supramolecule #1: E. coli Cytochrome bo3 ubiquinol oxidase monomer

SupramoleculeName: E. coli Cytochrome bo3 ubiquinol oxidase monomer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: Cytochrome bo(3) ubiquinol oxidase subunit 1

MacromoleculeName: Cytochrome bo(3) ubiquinol oxidase subunit 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: ubiquinol oxidase (H+-transporting)
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 73.896875 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MFGKLSLDAV PFHEPIVMVT IAGIILGGLA LVGLITYFGK WTYLWKEWLT SVDHKRLGIM YIIVAIVMLL RGFADAIMMR SQQALASAG EAGFLPPHHY DQIFTAHGVI MIFFVAMPFV IGLMNLVVPL QIGARDVAFP FLNNLSFWFT VVGVILVNVS L GVGEFAQT ...String:
MFGKLSLDAV PFHEPIVMVT IAGIILGGLA LVGLITYFGK WTYLWKEWLT SVDHKRLGIM YIIVAIVMLL RGFADAIMMR SQQALASAG EAGFLPPHHY DQIFTAHGVI MIFFVAMPFV IGLMNLVVPL QIGARDVAFP FLNNLSFWFT VVGVILVNVS L GVGEFAQT GWLAYPPLSG IEYSPGVGVD YWIWSLQLSG IGTTLTGINF FVTILKMRAP GMTMFKMPVF TWASLCANVL II ASFPILT VTVALLTLDR YLGTHFFTND MGGNMMMYIN LIWAWGHPEV YILILPVFGV FSEIAATFSR KRLFGYTSLV WAT VCITVL SFIVWLHHFF TMGAGANVNA FFGITTMIIA IPTGVKIFNW LFTMYQGRIV FHSAMLWTIG FIVTFSVGGM TGVL LAVPG ADFVLHNSLF LIAHFHNVII GGVVFGCFAG MTYWWPKAFG FKLNETWGKR AFWFWIIGFF VAFMPLYALG FMGMT RRLS QQIDPQFHTM LMIAASGAVL IALGILCLVI QMYVSIRDRD QNRDLTGDPW GGRTLEWATS SPPPFYNFAV VPHVHE RDA FWEMKEKGEA YKKPDHYEEI HMPKNSGAGI VIAAFSTIFG FAMIWHIWWL AIVGFAGMII TWIVKSFDED VDYYVPV AE IEKLENQHFD EITKAG

UniProtKB: Cytochrome bo(3) ubiquinol oxidase subunit 1

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Macromolecule #2: Cytochrome bo(3) ubiquinol oxidase subunit 2

MacromoleculeName: Cytochrome bo(3) ubiquinol oxidase subunit 2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 28.839297 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: GCNSALLDPK GQIGLEQRSL ILTAFGLMLI VVIPAILMAV GFAWKYRASN KDAKYSPNWS HSNKVEAVVW TVPILIIIFL AVLTWKTTH ALEPSKPLAH DEKPITIEVV SMDWKWFFIY PEQGIATVNE IAFPANTPVY FKVTSNSVMN SFFIPRLGSQ I YAMAGMQT ...String:
GCNSALLDPK GQIGLEQRSL ILTAFGLMLI VVIPAILMAV GFAWKYRASN KDAKYSPNWS HSNKVEAVVW TVPILIIIFL AVLTWKTTH ALEPSKPLAH DEKPITIEVV SMDWKWFFIY PEQGIATVNE IAFPANTPVY FKVTSNSVMN SFFIPRLGSQ I YAMAGMQT RLHLIANEPG TYDGISASYS GPGFSGMKFK AIATPDRAAF DQWVAKAKQS PNTMSDMAAF EKLAAPSEYN QV EYFSNVK PDLFADVINK FMA

UniProtKB: Cytochrome bo(3) ubiquinol oxidase subunit 2

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Macromolecule #3: Cytochrome bo(3) ubiquinol oxidase subunit 3

MacromoleculeName: Cytochrome bo(3) ubiquinol oxidase subunit 3 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 20.464258 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
AGGTKIFGFW IYLMSDCILF SILFATYAVL VNGTAGGPTG KDIFELPFVL VETFLLLFSS ITYGMAAIAM YKNNKSQVIS WLALTWLFG AGFIGMEIYE FHHLIVNGMG PDRSGFLSAF FALVGTHGLH VTSGLIWMAV LMVQIARRGL TSTNRTRIMC L SLFWHFLD VVWICVFTVV YLMGAM

UniProtKB: Cytochrome bo(3) ubiquinol oxidase subunit 3

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Macromolecule #4: Cytochrome bo(3) ubiquinol oxidase subunit 4

MacromoleculeName: Cytochrome bo(3) ubiquinol oxidase subunit 4 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 10.660987 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
GSVKTYMTGF ILSIILTVIP FWMVMTGAAS PAVILGTILA MAVVQVLVHL VCFLHMNTKS DEGWNMTAFV FTVLIIAILV VGSIWIMWN LNYNMMM

UniProtKB: Cytochrome bo(3) ubiquinol oxidase subunit 4

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Macromolecule #5: PROTOPORPHYRIN IX CONTAINING FE

MacromoleculeName: PROTOPORPHYRIN IX CONTAINING FE / type: ligand / ID: 5 / Number of copies: 1 / Formula: HEM
Molecular weightTheoretical: 616.487 Da
Chemical component information

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

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Macromolecule #6: HEME O

MacromoleculeName: HEME O / type: ligand / ID: 6 / Number of copies: 1 / Formula: HEO
Molecular weightTheoretical: 838.854 Da
Chemical component information

ChemComp-HEO:
HEME O

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Macromolecule #7: COPPER (II) ION

MacromoleculeName: COPPER (II) ION / type: ligand / ID: 7 / Number of copies: 1 / Formula: CU
Molecular weightTheoretical: 63.546 Da
Chemical component information

ChemComp-CU:
COPPER (II) ION

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Macromolecule #8: 1,2-Distearoyl-sn-glycerophosphoethanolamine

MacromoleculeName: 1,2-Distearoyl-sn-glycerophosphoethanolamine / type: ligand / ID: 8 / Number of copies: 3 / Formula: 3PE
Molecular weightTheoretical: 748.065 Da
Chemical component information

ChemComp-3PE:
1,2-Distearoyl-sn-glycerophosphoethanolamine / phospholipid*YM

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 80.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.15 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 150028
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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