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- EMDB-13122: High resolution structure of cytochrome bd-II oxidase from E. col... -

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Basic information

Entry
Database: EMDB / ID: EMD-13122
TitleHigh resolution structure of cytochrome bd-II oxidase from E. coli at 2.55 A resolution
Map dataFull map
Sample
  • Complex: Cytochrome bd-II oxidase from E. coli composed of subunit AppB, AppC and AppX
Function / homology
Function and homology information


ubiquinol oxidase (H+-transporting) / cytochrome bo3 ubiquinol oxidase activity / cytochrome complex / aerobic electron transport chain / oxidoreductase activity, acting on diphenols and related substances as donors, oxygen as acceptor / cell outer membrane / electron transfer activity / heme binding / membrane / metal ion binding / plasma membrane
Similarity search - Function
Membrane bound YbgT-like / Membrane bound YbgT-like protein / Cytochrome ubiquinol oxidase subunit 1 / Cytochrome ubiquinol oxidase subunit 2 / Cytochrome bd terminal oxidase subunit I / Cytochrome bd terminal oxidase subunit II
Similarity search - Domain/homology
Putative cytochrome bd-II ubiquinol oxidase subunit AppX / Cytochrome bd-II ubiquinol oxidase subunit 2 / Cytochrome bd-II ubiquinol oxidase subunit 1
Similarity search - Component
Biological speciesEscherichia coli K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.55 Å
AuthorsGrund TN / Wu D / Bald D / Michel H / Safarian S
Funding support Germany, 1 items
OrganizationGrant numberCountry
Max Planck SocietyNobel laureate fellowship Germany
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Mechanistic and structural diversity between cytochrome isoforms of .
Authors: Tamara N Grund / Melanie Radloff / Di Wu / Hojjat G Goojani / Luca F Witte / Wiebke Jösting / Sabine Buschmann / Hannelore Müller / Isam Elamri / Sonja Welsch / Harald Schwalbe / Hartmut ...Authors: Tamara N Grund / Melanie Radloff / Di Wu / Hojjat G Goojani / Luca F Witte / Wiebke Jösting / Sabine Buschmann / Hannelore Müller / Isam Elamri / Sonja Welsch / Harald Schwalbe / Hartmut Michel / Dirk Bald / Schara Safarian /
Abstract: The treatment of infectious diseases caused by multidrug-resistant pathogens is a major clinical challenge of the 21st century. The membrane-embedded respiratory cytochrome -type oxygen reductase is ...The treatment of infectious diseases caused by multidrug-resistant pathogens is a major clinical challenge of the 21st century. The membrane-embedded respiratory cytochrome -type oxygen reductase is a critical survival factor utilized by pathogenic bacteria during infection, proliferation and the transition from acute to chronic states. encodes for two cytochrome isoforms that are both involved in respiration under oxygen limited conditions. Mechanistic and structural differences between () and () operon encoded cytochrome variants have remained elusive in the past. Here, we demonstrate that cytochrome - catalyzes oxidation of benzoquinols while possessing additional specificity for naphthoquinones. Our data show that although menaquinol-1 (MK1) is not able to directly transfer electrons onto cytochrome from , it has a stimulatory effect on its oxygen reduction rate in the presence of ubiquinol-1. We further determined cryo-EM structures of cytochrome - to high resolution of 2.1 Å. Our structural insights confirm that the general architecture and substrate accessible pathways are conserved between the two oxidase isoforms, but two notable differences are apparent upon inspection: (i) does not contain a CydH-like subunit, thereby exposing heme to the membrane environment and (ii) the AppB subunit harbors a structural demethylmenaquinone-8 molecule instead of ubiquinone-8 as found in CydB of Our work completes the structural landscape of terminal respiratory oxygen reductases of and suggests that structural and functional properties of the respective oxidases are linked to quinol-pool dependent metabolic adaptations in .
History
DepositionJun 27, 2021-
Header (metadata) releaseDec 15, 2021-
Map releaseDec 15, 2021-
UpdateDec 15, 2021-
Current statusDec 15, 2021Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.013
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by height
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_13122.png

Downloads & links

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Map

FileDownload / File: emd_13122.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFull map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.84 Å/pix.
x 256 pix.
= 214.272 Å		0.84 Å/pix.
x 256 pix.
= 214.272 Å		0.84 Å/pix.
x 256 pix.
= 214.272 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.837 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.013 / Movie #1: 0.013
Minimum - Maximum-0.060055763 - 0.11181817
Average (Standard dev.)-4.2525007e-05 (±0.002224542)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 214.272 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8370.8370.837
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z214.272214.272214.272
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.0600.112-0.000

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Supplemental data

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Half map: Half map

Fileemd_13122_half_map_1.map
AnnotationHalf map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map

Fileemd_13122_half_map_2.map
AnnotationHalf map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cytochrome bd-II oxidase from E. coli composed of subunit AppB, A...

EntireName: Cytochrome bd-II oxidase from E. coli composed of subunit AppB, AppC and AppX
Components
  • Complex: Cytochrome bd-II oxidase from E. coli composed of subunit AppB, AppC and AppX

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Supramolecule #1: Cytochrome bd-II oxidase from E. coli composed of subunit AppB, A...

SupramoleculeName: Cytochrome bd-II oxidase from E. coli composed of subunit AppB, AppC and AppX
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Recombinant expressionOrganism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 104 KDa

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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

Concentration1.56 mg/mL
BufferpH: 7
Component:
ConcentrationNameFormula
20.0 mMTris
100.0 mMNaCl
0.002 % (w/v)LMNG
5.0 mMDTT
0.2 mMUbiquinone-1
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 103.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: Gctf (ver. 1.06)
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6rko

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.55 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 356058
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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