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- EMDB-6774: Cryo-EM structure of human respiratory complex III (cytochrome bc... -

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Basic information

Entry
Database: EMDB / ID: EMD-6774
TitleCryo-EM structure of human respiratory complex III (cytochrome bc1 complex)
Map dataThis map was obtained by sub-region refinement.
Sample
  • Complex: Human respiratory complex III
Function / homology
Function and homology information


Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / subthalamus development / pons development / Complex III assembly ...Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / Complex III assembly / subthalamus development / pons development / Complex III assembly / Complex III assembly / pyramidal neuron development / cerebellar Purkinje cell layer development / response to mercury ion / Respiratory electron transport / mitochondrial respiratory chain complex III assembly / thalamus development / respiratory chain complex III / Mitochondrial protein import / : / : / response to alkaloid / oxidative phosphorylation / quinol-cytochrome-c reductase / response to copper ion / ubiquinol-cytochrome-c reductase activity / response to glucagon / cellular respiration / midbrain development / hypothalamus development / mitochondrial electron transport, ubiquinol to cytochrome c / response to cobalamin / electron transport coupled proton transport / response to hyperoxia / animal organ regeneration / response to cadmium ion / Mitochondrial protein degradation / aerobic respiration / respiratory electron transport chain / generation of precursor metabolites and energy / hippocampus development / response to activity / metalloendopeptidase activity / response to toxic substance / 2 iron, 2 sulfur cluster binding / response to calcium ion / response to ethanol / mitochondrial inner membrane / electron transfer activity / response to hypoxia / oxidoreductase activity / response to xenobiotic stimulus / ubiquitin protein ligase binding / heme binding / protein-containing complex binding / mitochondrion / proteolysis / nucleoplasm / membrane / nucleus / metal ion binding
Similarity search - Function
Cytochrome b-c1 complex subunit 10 / Single alpha-helix domain superfamily / Ubiquinol-cytochrome C reductase complex, 6.4kD protein / Ubiquinol-cytochrome c reductase 8kDa, N-terminal / Ubiquinol-cytochrome c reductase 8 kDa, N-terminal / Cytochrome b-c1 complex, subunit 6 / Globular protein, non-globular alpha/beta subunit / Cytochrome b-c1 complex subunit 8 / UcrQ family / Cytochrome bc1 complex subunit Rieske, transmembrane domain superfamily ...Cytochrome b-c1 complex subunit 10 / Single alpha-helix domain superfamily / Ubiquinol-cytochrome C reductase complex, 6.4kD protein / Ubiquinol-cytochrome c reductase 8kDa, N-terminal / Ubiquinol-cytochrome c reductase 8 kDa, N-terminal / Cytochrome b-c1 complex, subunit 6 / Globular protein, non-globular alpha/beta subunit / Cytochrome b-c1 complex subunit 8 / UcrQ family / Cytochrome bc1 complex subunit Rieske, transmembrane domain superfamily / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 7 superfamily / Ubiquinol-cytochrome C reductase complex 14kD subunit / Cytochrome b-c1 complex subunit 9 / Cytochrome b-c1 complex subunit 8 superfamily / Cytochrome b-c1 complex subunit 9 superfamily / Ubiquinol-cytochrome C reductase, UQCRX/QCR9 like / Cytochrome b-c1 complex subunit Rieske, transmembrane domain / Ubiquinol cytochrome reductase transmembrane region / Ubiquinol-cytochrome C reductase hinge domain / Ubiquinol-cytochrome C reductase hinge domain superfamily / Ubiquinol-cytochrome C reductase hinge protein / Cytochrome c1, transmembrane anchor, C-terminal / : / Cytochrome b / : / Ubiquinol-cytochrome c reductase, iron-sulphur subunit / Cytochrome c1 / Cytochrome C1 family / : / Cytochrome b/b6, C-terminal / Cytochrome b(C-terminal)/b6/petD / Cytochrome b/b6 C-terminal region profile. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome b/b6/petB / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / Rieske iron-sulphur protein, C-terminal / Cytochrome b/b6, N-terminal / Cytochrome b/b6-like domain superfamily / Cytochrome b/b6 N-terminal region profile. / Di-haem cytochrome, transmembrane / Rieske iron-sulphur protein / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like / Rieske [2Fe-2S] domain / Rieske [2Fe-2S] iron-sulphur domain / Rieske [2Fe-2S] iron-sulfur domain profile. / Rieske [2Fe-2S] iron-sulphur domain superfamily / Cytochrome c-like domain superfamily
Similarity search - Domain/homology
Cytochrome b-c1 complex subunit 8 / Cytochrome b-c1 complex subunit 10 / Cytochrome b / Cytochrome b-c1 complex subunit 6, mitochondrial / Cytochrome c1, heme protein, mitochondrial / Cytochrome b-c1 complex subunit 7 / Cytochrome b-c1 complex subunit 2, mitochondrial / Cytochrome b-c1 complex subunit 1, mitochondrial / Cytochrome b-c1 complex subunit Rieske, mitochondrial / Cytochrome b-c1 complex subunit 9
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsGu J / Wu M / Yang M
CitationJournal: Cell / Year: 2017
Title: Architecture of Human Mitochondrial Respiratory Megacomplex IIIIIV.
Authors: Runyu Guo / Shuai Zong / Meng Wu / Jinke Gu / Maojun Yang /
Abstract: The respiratory megacomplex represents the highest-order assembly of respiratory chain complexes, and it allows mitochondria to respond to energy-requiring conditions. To understand its architecture, ...The respiratory megacomplex represents the highest-order assembly of respiratory chain complexes, and it allows mitochondria to respond to energy-requiring conditions. To understand its architecture, we examined the human respiratory chain megacomplex-IIIIIV (MCIIIIIV) with 140 subunits and a subset of associated cofactors using cryo-electron microscopy. The MCIIIIIV forms a circular structure with the dimeric CIII located in the center, where it is surrounded by two copies each of CI and CIV. Two cytochrome c (Cyt.c) molecules are positioned to accept electrons on the surface of the c state CIII dimer. Analyses indicate that CII could insert into the gaps between CI and CIV to form a closed ring, which we termed the electron transport chain supercomplex. The structure not only reveals the precise assignment of individual subunits of human CI and CIII, but also enables future in-depth analysis of the electron transport chain as a whole.
History
DepositionJun 18, 2017-
Header (metadata) releaseAug 30, 2017-
Map releaseAug 30, 2017-
UpdateSep 6, 2017-
Current statusSep 6, 2017Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0783
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.0783
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-5xte
  • Surface level: 0.0783
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_6774.png

Downloads & links

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Map

FileDownload / File: emd_6774.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThis map was obtained by sub-region refinement.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 480 pix.
= 519.84 Å		1.08 Å/pix.
x 480 pix.
= 519.84 Å		1.08 Å/pix.
x 480 pix.
= 519.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.083 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0783 / Movie #1: 0.0783
Minimum - Maximum-0.17762329 - 0.33905625
Average (Standard dev.)0.00027273496 (±0.005043188)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions480480480
Spacing480480480
CellA=B=C: 519.83997 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0831.0831.083
M x/y/z480480480
origin x/y/z0.0000.0000.000
length x/y/z519.840519.840519.840
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS480480480
D min/max/mean-0.1780.3390.000

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Supplemental data

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Sample components

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Entire : Human respiratory complex III

EntireName: Human respiratory complex III
Components
  • Complex: Human respiratory complex III

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Supramolecule #1: Human respiratory complex III

SupramoleculeName: Human respiratory complex III / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#11 / Details: Human cytochrome bc1 complex
Source (natural)Organism: Homo sapiens (human)
Molecular weightExperimental: 500 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

BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Average electron dose: 1.25 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: CTFFIND (ver. 3.0)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 1.4) / Number images used: 167761
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: RELION (ver. 1.4)
Final angle assignmentType: RANDOM ASSIGNMENT / Software - Name: RELION (ver. 1.4)

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