Journal: Elife / Year: 2018 Title: Cryo-EM structure of respiratory complex I at work. Authors: Kristian Parey / Ulrich Brandt / Hao Xie / Deryck J Mills / Karin Siegmund / Janet Vonck / Werner Kühlbrandt / Volker Zickermann / Abstract: Mitochondrial complex I has a key role in cellular energy metabolism, generating a major portion of the proton motive force that drives aerobic ATP synthesis. The hydrophilic arm of the L-shaped ~1 ...Mitochondrial complex I has a key role in cellular energy metabolism, generating a major portion of the proton motive force that drives aerobic ATP synthesis. The hydrophilic arm of the L-shaped ~1 MDa membrane protein complex transfers electrons from NADH to ubiquinone, providing the energy to drive proton pumping at distant sites in the membrane arm. The critical steps of energy conversion are associated with the redox chemistry of ubiquinone. We report the cryo-EM structure of complete mitochondrial complex I from the aerobic yeast both in the deactive form and after capturing the enzyme during steady-state activity. The site of ubiquinone binding observed during turnover supports a two-state stabilization change mechanism for complex I.
Conc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen support
Grid material: COPPER / Grid type: C-flat-1/1
Vitrification
Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 70 % / Chamber temperature: 283 K
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Electron microscopy imaging
Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company
Microscopy
Model: FEI POLARA 300
Electron gun
Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lens
Mode: OTHER / Nominal magnification: 200000 X / Calibrated magnification: 45872 X / Nominal defocus max: -3 nm / Nominal defocus min: -1.5 nm / Cs: 2 mm / Alignment procedure: COMA FREE
Specimen holder
Cryogen: NITROGEN
Image recording
Average exposure time: 8 sec. / Electron dose: 60.5 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3110
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