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- EMDB-42126: CI protomer-1 membrane arm focus refined map -

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Basic information

Entry
Database: EMDB / ID: EMD-42126
TitleCI protomer-1 membrane arm focus refined map
Map dataCI (1) membrane arm focus refined map
Sample
  • Complex: Mitochondrial Super-complex with CI dimer and CIII dimer (Super-complex XL)
KeywordsSuper complex XL (CI2+CIII2) / ELECTRON TRANSPORT
Biological speciesMus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.76 Å
AuthorsLetts JA / Padavannil A
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM137929 United States
CitationJournal: Cell Metab / Year: 2025
Title: Formation of I+III supercomplex rescues respiratory chain defects.
Authors: Chao Liang / Abhilash Padavannil / Shan Zhang / Sheryl Beh / David R L Robinson / Jana Meisterknecht / Alfredo Cabrera-Orefice / Timothy R Koves / Chika Watanabe / Miyuki Watanabe / María ...Authors: Chao Liang / Abhilash Padavannil / Shan Zhang / Sheryl Beh / David R L Robinson / Jana Meisterknecht / Alfredo Cabrera-Orefice / Timothy R Koves / Chika Watanabe / Miyuki Watanabe / María Illescas / Radiance Lim / Jordan M Johnson / Shuxun Ren / Ya-Jun Wu / Dennis Kappei / Anna Maria Ghelli / Katsuhiko Funai / Hitoshi Osaka / Deborah Muoio / Cristina Ugalde / Ilka Wittig / David A Stroud / James A Letts / Lena Ho /
Abstract: Mitochondrial electron transport chain (ETC) complexes partition between free complexes and quaternary assemblies known as supercomplexes (SCs). However, the physiological requirement for SCs and the ...Mitochondrial electron transport chain (ETC) complexes partition between free complexes and quaternary assemblies known as supercomplexes (SCs). However, the physiological requirement for SCs and the mechanisms regulating their formation remain controversial. Here, we show that genetic perturbations in mammalian ETC complex III (CIII) biogenesis stimulate the formation of a specialized extra-large SC (SC-XL) with a structure of I+III, resolved at 3.7 Å by cryoelectron microscopy (cryo-EM). SC-XL formation increases mitochondrial cristae density, reduces CIII reactive oxygen species (ROS), and sustains normal respiration despite a 70% reduction in CIII activity, effectively rescuing CIII deficiency. Consequently, inhibiting SC-XL formation in CIII mutants using the Uqcrc1 contact site mutation leads to respiratory decompensation. Lastly, SC-XL formation promotes fatty acid oxidation (FAO) and protects against ischemic heart failure in mice. Our study uncovers an unexpected plasticity in the mammalian ETC, where structural adaptations mitigate intrinsic perturbations, and suggests that manipulating SC-XL formation is a potential therapeutic strategy for mitochondrial dysfunction.
History
DepositionSep 26, 2023-
Header (metadata) releaseJan 22, 2025-
Map releaseJan 22, 2025-
UpdateFeb 19, 2025-
Current statusFeb 19, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_42126.png

Downloads & links

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Map

FileDownload / File: emd_42126.map.gz / Format: CCP4 / Size: 1.1 GB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCI (1) membrane arm focus refined map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.88 Å/pix.
x 672 pix.
= 591.36 Å		0.88 Å/pix.
x 672 pix.
= 591.36 Å		0.88 Å/pix.
x 672 pix.
= 591.36 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.88 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.45
Minimum - Maximum-0.99171716 - 1.7208767
Average (Standard dev.)0.0009392439 (±0.049974762)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions672672672
Spacing672672672
CellA=B=C: 591.36 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_42126_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: CI (1) membrane arm focus refined half map B

Fileemd_42126_half_map_1.map
AnnotationCI (1) membrane arm focus refined half map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: CI (1) membrane arm focus refined half map A

Fileemd_42126_half_map_2.map
AnnotationCI (1) membrane arm focus refined half map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Mitochondrial Super-complex with CI dimer and CIII dimer (Super-c...

EntireName: Mitochondrial Super-complex with CI dimer and CIII dimer (Super-complex XL)
Components
  • Complex: Mitochondrial Super-complex with CI dimer and CIII dimer (Super-complex XL)

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Supramolecule #1: Mitochondrial Super-complex with CI dimer and CIII dimer (Super-c...

SupramoleculeName: Mitochondrial Super-complex with CI dimer and CIII dimer (Super-complex XL)
type: complex / ID: 1 / Parent: 0
Macromolecule list: #1, #57, #2-#3, #55, #54, #56, #4, #58, #5-#53
Source (natural)Organism: Mus musculus (house mouse)

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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: 7.7
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS GLACIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.5 µm

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

8om1

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.76 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 182132
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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