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- EMDB-4091: Ovine respiratory complex I, membrane domain -

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Basic information

Entry
Database: EMDB / ID: EMD-4091
TitleOvine respiratory complex I, membrane domain
Map data
Sample
  • Complex: Complex IRespiratory complex I
Biological speciesOvis aries (sheep)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsFiedorczuk K / Letts JA / Sazanov LA
CitationJournal: Nature / Year: 2016
Title: Atomic structure of the entire mammalian mitochondrial complex I.
Authors: Karol Fiedorczuk / James A Letts / Gianluca Degliesposti / Karol Kaszuba / Mark Skehel / Leonid A Sazanov /
Abstract: Mitochondrial complex I (also known as NADH:ubiquinone oxidoreductase) contributes to cellular energy production by transferring electrons from NADH to ubiquinone coupled to proton translocation ...Mitochondrial complex I (also known as NADH:ubiquinone oxidoreductase) contributes to cellular energy production by transferring electrons from NADH to ubiquinone coupled to proton translocation across the membrane. It is the largest protein assembly of the respiratory chain with a total mass of 970 kilodaltons. Here we present a nearly complete atomic structure of ovine (Ovis aries) mitochondrial complex I at 3.9 Å resolution, solved by cryo-electron microscopy with cross-linking and mass-spectrometry mapping experiments. All 14 conserved core subunits and 31 mitochondria-specific supernumerary subunits are resolved within the L-shaped molecule. The hydrophilic matrix arm comprises flavin mononucleotide and 8 iron-sulfur clusters involved in electron transfer, and the membrane arm contains 78 transmembrane helices, mostly contributed by antiporter-like subunits involved in proton translocation. Supernumerary subunits form an interlinked, stabilizing shell around the conserved core. Tightly bound lipids (including cardiolipins) further stabilize interactions between the hydrophobic subunits. Subunits with possible regulatory roles contain additional cofactors, NADPH and two phosphopantetheine molecules, which are shown to be involved in inter-subunit interactions. We observe two different conformations of the complex, which may be related to the conformationally driven coupling mechanism and to the active-deactive transition of the enzyme. Our structure provides insight into the mechanism, assembly, maturation and dysfunction of mitochondrial complex I, and allows detailed molecular analysis of disease-causing mutations.
History
DepositionAug 3, 2016-
Header (metadata) releaseOct 12, 2016-
Map releaseOct 19, 2016-
UpdateNov 28, 2018-
Current statusNov 28, 2018Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.24
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.24
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_4091.png

Downloads & links

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Map

FileDownload / File: emd_4091.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.39 Å
Density
Contour LevelBy AUTHOR: 0.24 / Movie #1: 0.24
Minimum - Maximum-0.58187467 - 0.8491295
Average (Standard dev.)-0.00020540803 (±0.033928838)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 711.68 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.391.391.39
M x/y/z512512512
origin x/y/z0.0000.0000.000
length x/y/z711.680711.680711.680
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS512512512
D min/max/mean-0.5820.849-0.000

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Supplemental data

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Sample components

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Entire : Complex I

EntireName: Complex IRespiratory complex I
Components
  • Complex: Complex IRespiratory complex I

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Supramolecule #1: Complex I

SupramoleculeName: Complex I / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Ovis aries (sheep)
Molecular weightExperimental: 970 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

Concentration5 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
100.0 mMNaClSodium chloridesodium chloride
20.0 mMHEPES
2.0 mMEDTAEthylenediaminetetraacetic acid
1.5 %C3H8O3Glycerol
0.2 %Brij-35
GridModel: Quantifoil R0.6/1 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: 34s blotting.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 100720 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 59000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Digitization - Sampling interval: 14.0 µm / Digitization - Frames/image: 1-7 / Number grids imaged: 2 / Number real images: 2600 / Average exposure time: 1.0 sec. / Average electron dose: 26.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 241000
CTF correctionSoftware - Name: Gctf
Startup modelType of model: EMDB MAP
EMDB ID:

2676

Initial angle assignmentType: NOT APPLICABLE / Software - Name: RELION (ver. 1.4)
Final 3D classificationSoftware - Name: RELION (ver. 1.4)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 1.4)
Final reconstructionNumber classes used: 1 / Resolution.type: BY AUTHOR / Resolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 1.4) / Number images used: 82000
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL

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