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- EMDB-30474: 2.55-Angstrom Cryo-EM structure of Cytochrome bo3 from Escherichi... -

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Basic information

Entry
Database: EMDB / ID: EMD-30474
Title2.55-Angstrom Cryo-EM structure of Cytochrome bo3 from Escherichia coli in Native Membrane
Map data
Sample
  • Complex: Cytochrome bo(3) ubiquinol oxidase
    • 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
  • Ligand: Ubiquinone-8
Keywordsproton pump / ubiquinol / oxidase / OXIDOREDUCTASE
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 / proton transmembrane transporter activity / electron transport coupled proton transport ...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 / proton transmembrane transporter activity / electron transport coupled proton transport / 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: 2.64 Å
AuthorsLi J / Han L
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Cryo-EM structures of cytochrome reveal bound phospholipids and ubiquinone-8 in a dynamic substrate binding site.
Authors: Jiao Li / Long Han / Francesca Vallese / Ziqiao Ding / Sylvia K Choi / Sangjin Hong / Yanmei Luo / Bin Liu / Chun Kit Chan / Emad Tajkhorshid / Jiapeng Zhu / Oliver Clarke / Kai Zhang / Robert Gennis /
Abstract: Two independent structures of the proton-pumping, respiratory cytochrome ubiquinol oxidase (cyt ) have been determined by cryogenic electron microscopy (cryo-EM) in styrene-maleic acid (SMA) ...Two independent structures of the proton-pumping, respiratory cytochrome ubiquinol oxidase (cyt ) have been determined by cryogenic electron microscopy (cryo-EM) in styrene-maleic acid (SMA) copolymer nanodiscs and in membrane scaffold protein (MSP) nanodiscs to 2.55- and 2.19-Å resolution, respectively. The structures include the metal redox centers (heme , heme , and Cu), the redox-active cross-linked histidine-tyrosine cofactor, and the internal water molecules in the proton-conducting D channel. Each structure also contains one equivalent of ubiquinone-8 (UQ8) in the substrate binding site as well as several phospholipid molecules. The isoprene side chain of UQ8 is clamped within a hydrophobic groove in subunit I by transmembrane helix TM0, which is only present in quinol oxidases and not in the closely related cytochrome oxidases. Both structures show carbonyl O1 of the UQ8 headgroup hydrogen bonded to D75 and R71 In both structures, residue H98 occupies two conformations. In conformation 1, H98 forms a hydrogen bond with carbonyl O4 of the UQ8 headgroup, but in conformation 2, the imidazole side chain of H98 has flipped to form a hydrogen bond with E14 at the N-terminal end of TM0. We propose that H98 dynamics facilitate proton transfer from ubiquinol to the periplasmic aqueous phase during oxidation of the substrate. Computational studies show that TM0 creates a channel, allowing access of water to the ubiquinol headgroup and to H98.
History
DepositionAug 24, 2020-
Header (metadata) releaseAug 25, 2021-
Map releaseAug 25, 2021-
UpdateMay 29, 2024-
Current statusMay 29, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 1
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 1
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7cuq
  • Surface level: 1
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Structure viewerEM map:
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Supplemental images

emd_30474.png

Downloads & links

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Map

FileDownload / File: emd_30474.map.gz / Format: CCP4 / Size: 178 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 360 pix.
= 299.52 Å		0.83 Å/pix.
x 360 pix.
= 299.52 Å		0.83 Å/pix.
x 360 pix.
= 299.52 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.832 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.37 / Movie #1: 1
Minimum - Maximum-3.2250686 - 6.436268
Average (Standard dev.)0.0043363683 (±0.14714426)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 299.52002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8320.8320.832
M x/y/z360360360
origin x/y/z0.0000.0000.000
length x/y/z299.520299.520299.520
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ384384384
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS360360360
D min/max/mean-3.2256.4360.004

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Supplemental data

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Sample components

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Entire : Cytochrome bo(3) ubiquinol oxidase

EntireName: Cytochrome bo(3) ubiquinol oxidase
Components
  • Complex: Cytochrome bo(3) ubiquinol oxidase
    • 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
  • Ligand: Ubiquinone-8

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Supramolecule #1: Cytochrome bo(3) ubiquinol oxidase

SupramoleculeName: Cytochrome bo(3) ubiquinol oxidase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 140 KDa

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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: 74.424469 KDa
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 EITKAGLKNG N

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: 32.249971 KDa
SequenceString: CNSALLDPKG QIGLEQRSLI LTAFGLMLIV VIPAILMAVG FAWKYRASNK DAKYSPNWSH SNKVEAVVWT VPILIIIFLA VLTWKTTHA LEPSKPLAHD EKPITIEVVS MDWKWFFIYP EQGIATVNEI AFPANTPVYF KVTSNSVMNS FFIPRLGSQI Y AMAGMQTR ...String:
CNSALLDPKG QIGLEQRSLI LTAFGLMLIV VIPAILMAVG FAWKYRASNK DAKYSPNWSH SNKVEAVVWT VPILIIIFLA VLTWKTTHA LEPSKPLAHD EKPITIEVVS MDWKWFFIYP EQGIATVNEI AFPANTPVYF KVTSNSVMNS FFIPRLGSQI Y AMAGMQTR LHLIANEPGT YDGISASYSG PGFSGMKFKA IATPDRAAFD QWVAKAKQSP NTMSDMAAFE KLAAPSEYNQ VE YFSNVKP DLFADVINKF MAHGKSMDMT QPEGEHSAHE GMEGMDMSHA ESAH

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: 22.642566 KDa
SequenceString: MATDTLTHAT AHAHEHGHHD AGGTKIFGFW IYLMSDCILF SILFATYAVL VNGTAGGPTG KDIFELPFVL VETFLLLFSS ITYGMAAIA MYKNNKSQVI SWLALTWLFG AGFIGMEIYE FHHLIVNGMG PDRSGFLSAF FALVGTHGLH VTSGLIWMAV L MVQIARRG ...String:
MATDTLTHAT AHAHEHGHHD AGGTKIFGFW IYLMSDCILF SILFATYAVL VNGTAGGPTG KDIFELPFVL VETFLLLFSS ITYGMAAIA MYKNNKSQVI SWLALTWLFG AGFIGMEIYE FHHLIVNGMG PDRSGFLSAF FALVGTHGLH VTSGLIWMAV L MVQIARRG LTSTNRTRIM CLSLFWHFLD 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: 12.037402 KDa
SequenceString:
MSHSTDHSGA SHGSVKTYMT GFILSIILTV IPFWMVMTGA ASPAVILGTI LAMAVVQVLV HLVCFLHMNT KSDEGWNMTA FVFTVLIIA ILVVGSIWIM WNLNYNMMMH

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: 5 / Formula: 3PE
Molecular weightTheoretical: 748.065 Da
Chemical component information

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

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Macromolecule #9: Ubiquinone-8

MacromoleculeName: Ubiquinone-8 / type: ligand / ID: 9 / Number of copies: 1 / Formula: UQ8
Molecular weightTheoretical: 727.109 Da
Chemical component information

ChemComp-UQ8:
Ubiquinone-8

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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: 1.3 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.64 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 209984
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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