+Open data
-Basic information
Entry | Database: PDB / ID: 7zd6 | ||||||
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Title | Complex I from Ovis aries, at pH7.4, Open state | ||||||
Components |
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Keywords | PROTON TRANSPORT / Complex I / respiration / NADH / proton pump / mitochondria / iron-sulphur cluster / oxidoreductase / membrane protein / Quinone | ||||||
Function / homology | Function and homology information oxidoreductase activity, acting on NAD(P)H / NADH:ubiquinone reductase (H+-translocating) / apoptotic mitochondrial changes / NADH dehydrogenase activity / mitochondrial ATP synthesis coupled electron transport / : / mitochondrial respiratory chain complex I assembly / mitochondrial electron transport, NADH to ubiquinone / electron transport coupled proton transport / acyl binding ...oxidoreductase activity, acting on NAD(P)H / NADH:ubiquinone reductase (H+-translocating) / apoptotic mitochondrial changes / NADH dehydrogenase activity / mitochondrial ATP synthesis coupled electron transport / : / mitochondrial respiratory chain complex I assembly / mitochondrial electron transport, NADH to ubiquinone / electron transport coupled proton transport / acyl binding / acyl carrier activity / NADH dehydrogenase (ubiquinone) activity / ATP synthesis coupled electron transport / quinone binding / membrane => GO:0016020 / : / ATP metabolic process / respiratory electron transport chain / reactive oxygen species metabolic process / FAD binding / regulation of mitochondrial membrane potential / electron transport chain / mitochondrial intermembrane space / 2 iron, 2 sulfur cluster binding / circadian rhythm / NAD binding / FMN binding / 4 iron, 4 sulfur cluster binding / response to oxidative stress / mitochondrial inner membrane / oxidoreductase activity / mitochondrial matrix / protein-containing complex binding / nucleus / metal ion binding Similarity search - Function | ||||||
Biological species | Ovis aries (sheep) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.16 Å | ||||||
Authors | Sazanov, L. / Petrova, O. | ||||||
Funding support | European Union, 1items
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Citation | Journal: Nature / Year: 2022 Title: A universal coupling mechanism of respiratory complex I. Authors: Vladyslav Kravchuk / Olga Petrova / Domen Kampjut / Anna Wojciechowska-Bason / Zara Breese / Leonid Sazanov / Abstract: Complex I is the first enzyme in the respiratory chain, which is responsible for energy production in mitochondria and bacteria. Complex I couples the transfer of two electrons from NADH to quinone ...Complex I is the first enzyme in the respiratory chain, which is responsible for energy production in mitochondria and bacteria. Complex I couples the transfer of two electrons from NADH to quinone and the translocation of four protons across the membrane, but the coupling mechanism remains contentious. Here we present cryo-electron microscopy structures of Escherichia coli complex I (EcCI) in different redox states, including catalytic turnover. EcCI exists mostly in the open state, in which the quinone cavity is exposed to the cytosol, allowing access for water molecules, which enable quinone movements. Unlike the mammalian paralogues, EcCI can convert to the closed state only during turnover, showing that closed and open states are genuine turnover intermediates. The open-to-closed transition results in the tightly engulfed quinone cavity being connected to the central axis of the membrane arm, a source of substrate protons. Consistently, the proportion of the closed state increases with increasing pH. We propose a detailed but straightforward and robust mechanism comprising a 'domino effect' series of proton transfers and electrostatic interactions: the forward wave ('dominoes stacking') primes the pump, and the reverse wave ('dominoes falling') results in the ejection of all pumped protons from the distal subunit NuoL. This mechanism explains why protons exit exclusively from the NuoL subunit and is supported by our mutagenesis data. We contend that this is a universal coupling mechanism of complex I and related enzymes. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7zd6.cif.gz | 1.6 MB | Display | PDBx/mmCIF format |
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PDB format | pdb7zd6.ent.gz | 1.3 MB | Display | PDB format |
PDBx/mmJSON format | 7zd6.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 7zd6_validation.pdf.gz | 2.3 MB | Display | wwPDB validaton report |
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Full document | 7zd6_full_validation.pdf.gz | 2.3 MB | Display | |
Data in XML | 7zd6_validation.xml.gz | 193.6 KB | Display | |
Data in CIF | 7zd6_validation.cif.gz | 302.8 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/zd/7zd6 ftp://data.pdbj.org/pub/pdb/validation_reports/zd/7zd6 | HTTPS FTP |
-Related structure data
Related structure data | 14637MC 7p61C 7p62C 7p63C 7p64C 7p69C 7p7cC 7p7eC 7p7jC 7p7kC 7p7lC 7p7mC 7z7rC 7z7sC 7z7tC 7z7vC 7z80C 7z83C 7z84C 7zc5C 7zciC 7zdhC 7zdjC 7zdmC 7zdpC 7zebC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
+NADH-ubiquinone oxidoreductase chain ... , 7 types, 7 molecules AHJKLMN
+NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit ... , 9 types, 9 molecules VYkmqefgi
+NADH dehydrogenase [ubiquinone] 1 beta subcomplex subunit ... , 8 types, 8 molecules Wnstuvwy
+Protein , 5 types, 6 molecules XjZz34
+NADH dehydrogenase [ubiquinone] iron-sulfur protein ... , 6 types, 6 molecules l569bc
+NADH dehydrogenase [ubiquinone] 1 subunit ... , 2 types, 2 molecules ox
+NADH:ubiquinone oxidoreductase subunit ... , 2 types, 2 molecules pd
+Mitochondrial complex I, ... , 2 types, 2 molecules rh
+NADH dehydrogenase [ubiquinone] flavoprotein ... , 3 types, 3 molecules 12a
+Non-polymers , 13 types, 38 molecules
+Details
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Complex I from Ovis aries, at pH7.4, Open state / Type: COMPLEX / Entity ID: #1-#44 / Source: NATURAL |
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Molecular weight | Value: 1 MDa / Experimental value: YES |
Source (natural) | Organism: Ovis aries (sheep) |
Buffer solution | pH: 7.4 |
Specimen | Conc.: 3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER / Grid type: Quantifoil |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
-Electron microscopy imaging
Microscopy | Model: TFS GLACIOS |
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Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 120000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Average exposure time: 3.3 sec. / Electron dose: 90 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k) |
-Processing
Software | Name: PHENIX / Version: dev_4092: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.16 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 113712 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL / Target criteria: correlation coefficient | ||||||||||||||||||||||||
Atomic model building | PDB-ID: 6ZKE | ||||||||||||||||||||||||
Refine LS restraints |
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