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- EMDB-23420: CIII2CIV2 yeast supercomplex with cytochrome c. Non-uniform refin... -

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Basic information

Entry
Database: EMDB / ID: EMD-23420
TitleCIII2CIV2 yeast supercomplex with cytochrome c. Non-uniform refinement.
Map dataCIII2CIV2 yeast supercomplex with cytochrome c. Non-uniform refinement.
Sample
  • Complex: yeast III-IV supercomplex with cytochrome c
Function / homology
Function and homology information


: / Complex III assembly / matrix side of mitochondrial inner membrane / protein processing involved in protein targeting to mitochondrion / mitochondrial cytochrome c oxidase assembly / Respiratory electron transport / mitochondrial respiratory chain complex III assembly / mitochondrial respirasome assembly / Mitochondrial protein degradation / : ...: / Complex III assembly / matrix side of mitochondrial inner membrane / protein processing involved in protein targeting to mitochondrion / mitochondrial cytochrome c oxidase assembly / Respiratory electron transport / mitochondrial respiratory chain complex III assembly / mitochondrial respirasome assembly / Mitochondrial protein degradation / : / : / : / cytochrome-c oxidase / quinol-cytochrome-c reductase / ubiquinol-cytochrome-c reductase activity / mitochondrial electron transport, cytochrome c to oxygen / cellular respiration / cytochrome-c oxidase activity / mitochondrial electron transport, ubiquinol to cytochrome c / mitochondrial crista / electron transport coupled proton transport / ATP synthesis coupled electron transport / enzyme regulator activity / aerobic respiration / nuclear periphery / proton transmembrane transport / mitochondrial membrane / metalloendopeptidase activity / mitochondrial intermembrane space / 2 iron, 2 sulfur cluster binding / mitochondrial inner membrane / oxidoreductase activity / copper ion binding / heme binding / mitochondrion / proteolysis / zinc ion binding / membrane / metal ion binding / cytosol
Similarity search - Function
Cytochrome c oxidase subunit VII, budding yeast / Cytochrome c oxidase, subunit VIIa, fungal / Cytochrome b-c1 complex subunit 10, fungi / Ubiquinol-cytochrome-c reductase complex subunit (QCR10) / Cytochrome c oxidase, subunit VIa, conserved site / Cytochrome c oxidase subunit VIa signature. / Cytochrome c oxidase, subunit VIb / : / Cytochrome c oxidase, subunit VIa / Cytochrome c oxidase, subunit VIa superfamily ...Cytochrome c oxidase subunit VII, budding yeast / Cytochrome c oxidase, subunit VIIa, fungal / Cytochrome b-c1 complex subunit 10, fungi / Ubiquinol-cytochrome-c reductase complex subunit (QCR10) / Cytochrome c oxidase, subunit VIa, conserved site / Cytochrome c oxidase subunit VIa signature. / Cytochrome c oxidase, subunit VIb / : / Cytochrome c oxidase, subunit VIa / Cytochrome c oxidase, subunit VIa superfamily / Cytochrome c oxidase subunit VIa / Cytochrome c oxidase, subunit VIb superfamily / Cytochrome c oxidase subunit 2, C-terminal / Cytochrome oxidase c subunit VIb / Cytochrome c oxidase subunit Vb, zinc binding region signature. / Cytochrome c oxidase subunit VIIc / Cytochrome c oxidase subunit IV family / Cytochrome c oxidase subunit VIIc superfamily / Cytochrome c oxidase subunit IV superfamily / Cytochrome c oxidase subunit VIIc / Cytochrome c oxidase subunit IV / Cytochrome c oxidase, subunit Va/VI / Cytochrome c oxidase, subunit Va/VI superfamily / Cytochrome c oxidase subunit Va / Cytochrome c oxidase subunit VII / Cytochrome c oxidase subunit VII / Cytochrome c oxidase subunit III domain / Cytochrome c oxidase, subunit Vb / Cytochrome c oxidase, subunit Vb superfamily / Cytochrome c oxidase subunit Vb / Cytochrome c oxidase subunit Vb, zinc binding domain profile. / Cytochrome c oxidase, subunit II / Cytochrome c oxidase subunit I domain / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome b-c1 complex subunit 8 / UcrQ family / Cytochrome C oxidase subunit II, transmembrane domain / Cytochrome oxidase subunit II transmembrane region profile. / 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 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 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 c/quinol oxidase subunit II / : / Cytochrome b / Copper centre Cu(A) / CO II and nitrous oxide reductase dinuclear copper centers signature. / Cytochrome C oxidase subunit II, transmembrane domain superfamily / : / 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 c oxidase, subunit I, copper-binding site / Heme-copper oxidase catalytic subunit, copper B binding region signature. / Cytochrome b/b6, C-terminal domain superfamily / Cytochrome b/b6/petB / Cytochrome c oxidase-like, subunit I domain / Cytochrome oxidase subunit I profile. / Peptidase M16, zinc-binding site / Insulinase family, zinc-binding region signature. / 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. / 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.
Similarity search - Domain/homology
Cytochrome b-c1 complex subunit 6, mitochondrial / Cytochrome b-c1 complex subunit 7, mitochondrial / Cytochrome b / Cytochrome c oxidase subunit 1 / Cytochrome c oxidase subunit 2 / Cytochrome c oxidase subunit 3 / Cytochrome c oxidase subunit 5A, mitochondrial / Cytochrome c oxidase subunit 6, mitochondrial / Cytochrome c oxidase subunit 4, mitochondrial / Cytochrome c oxidase subunit 8, mitochondrial ...Cytochrome b-c1 complex subunit 6, mitochondrial / Cytochrome b-c1 complex subunit 7, mitochondrial / Cytochrome b / Cytochrome c oxidase subunit 1 / Cytochrome c oxidase subunit 2 / Cytochrome c oxidase subunit 3 / Cytochrome c oxidase subunit 5A, mitochondrial / Cytochrome c oxidase subunit 6, mitochondrial / Cytochrome c oxidase subunit 4, mitochondrial / Cytochrome c oxidase subunit 8, mitochondrial / Cytochrome c1, heme protein, mitochondrial / Cytochrome c oxidase subunit 9, mitochondrial / Cytochrome b-c1 complex subunit 1, mitochondrial / Cytochrome b-c1 complex subunit 2, mitochondrial / Cytochrome b-c1 complex subunit Rieske, mitochondrial / Cytochrome b-c1 complex subunit 8, mitochondrial / Cytochrome c oxidase subunit 7, mitochondrial / Cytochrome b-c1 complex subunit 9, mitochondrial / Cytochrome c oxidase subunit 13, mitochondrial / Cytochrome b-c1 complex subunit 10, mitochondrial / Cytochrome c oxidase subunit 12, mitochondrial / Cytochrome c oxidase subunit 26, mitochondrial
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsMoe A / Di Trani J / Rubinstein J / Brzezinski P
Funding support Canada, Sweden, 2 items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)PJT162186 Canada
Knut and Alice Wallenberg Foundation2019.0043 Sweden
CitationJournal: Proc Natl Acad Sci U S A / Year: 2021
Title: Cryo-EM structure and kinetics reveal electron transfer by 2D diffusion of cytochrome in the yeast III-IV respiratory supercomplex.
Authors: Agnes Moe / Justin Di Trani / John L Rubinstein / Peter Brzezinski /
Abstract: Energy conversion in aerobic organisms involves an electron current from low-potential donors, such as NADH and succinate, to dioxygen through the membrane-bound respiratory chain. Electron transfer ...Energy conversion in aerobic organisms involves an electron current from low-potential donors, such as NADH and succinate, to dioxygen through the membrane-bound respiratory chain. Electron transfer is coupled to transmembrane proton transport, which maintains the electrochemical proton gradient used to produce ATP and drive other cellular processes. Electrons are transferred from respiratory complexes III to IV (CIII and CIV) by water-soluble cytochrome (cyt.) In and some other organisms, these complexes assemble into larger CIIICIV supercomplexes, the functional significance of which has remained enigmatic. In this work, we measured the kinetics of the supercomplex cyt. -mediated QH:O oxidoreductase activity under various conditions. The data indicate that the electronic link between CIII and CIV is confined to the surface of the supercomplex. Single-particle electron cryomicroscopy (cryo-EM) structures of the supercomplex with cyt. show the positively charged cyt. bound to either CIII or CIV or along a continuum of intermediate positions. Collectively, the structural and kinetic data indicate that cyt. travels along a negatively charged patch on the supercomplex surface. Thus, rather than enhancing electron transfer rates by decreasing the distance that cyt. must diffuse in three dimensions, formation of the CIIICIV supercomplex facilitates electron transfer by two-dimensional (2D) diffusion of cyt. This mechanism enables the CIIICIV supercomplex to increase QH:O oxidoreductase activity and suggests a possible regulatory role for supercomplex formation in the respiratory chain.
History
DepositionFeb 4, 2021-
Header (metadata) releaseApr 14, 2021-
Map releaseApr 14, 2021-
UpdateApr 21, 2021-
Current statusApr 21, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.44
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.44
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23420.png

Downloads & links

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Map

FileDownload / File: emd_23420.map.gz / Format: CCP4 / Size: 209.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCIII2CIV2 yeast supercomplex with cytochrome c. Non-uniform refinement.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.03 Å/pix.
x 380 pix.
= 391.4 Å		1.03 Å/pix.
x 380 pix.
= 391.4 Å		1.03 Å/pix.
x 380 pix.
= 391.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.03 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.44 / Movie #1: 0.44
Minimum - Maximum-1.0142734 - 2.6821268
Average (Standard dev.)0.0017353555 (±0.094440855)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions380380380
Spacing380380380
CellA=B=C: 391.4 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.031.031.03
M x/y/z380380380
origin x/y/z0.0000.0000.000
length x/y/z391.400391.400391.400
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS380380380
D min/max/mean-1.0142.6820.002

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Supplemental data

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Sample components

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Entire : yeast III-IV supercomplex with cytochrome c

EntireName: yeast III-IV supercomplex with cytochrome c
Components
  • Complex: yeast III-IV supercomplex with cytochrome c

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Supramolecule #1: yeast III-IV supercomplex with cytochrome c

SupramoleculeName: yeast III-IV supercomplex with cytochrome c / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)

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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-PROPANE
Detailsmonodisperse

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 42.0 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

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 2) / Number images used: 24269
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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