7NYH

Respiratory complex I from Escherichia coli - focused refinement of membrane arm


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Structure of Escherichia coli respiratory complex I reconstituted into lipid nanodiscs reveals an uncoupled conformation.

Kolata, P.Efremov, R.G.

(2021) Elife 10

  • DOI: 10.7554/eLife.68710
  • Primary Citation of Related Structures:  
    7NYH, 7NYR, 7NYU, 7NYV, 7NZ1

  • PubMed Abstract: 
  • Respiratory complex I is a multi-subunit membrane protein complex that reversibly couples NADH oxidation and ubiquinone reduction with proton translocation against transmembrane potential. Complex I from Escherichia coli is among the best functionally characterized complexes, but its structure remains unknown, hindering further studies to understand the enzyme coupling mechanism ...

    Respiratory complex I is a multi-subunit membrane protein complex that reversibly couples NADH oxidation and ubiquinone reduction with proton translocation against transmembrane potential. Complex I from Escherichia coli is among the best functionally characterized complexes, but its structure remains unknown, hindering further studies to understand the enzyme coupling mechanism. Here, we describe the single particle cryo-electron microscopy (cryo-EM) structure of the entire catalytically active E. coli complex I reconstituted into lipid nanodiscs. The structure of this mesophilic bacterial complex I displays highly dynamic connection between the peripheral and membrane domains. The peripheral domain assembly is stabilized by unique terminal extensions and an insertion loop. The membrane domain structure reveals novel dynamic features. Unusual conformation of the conserved interface between the peripheral and membrane domains suggests an uncoupled conformation of the complex. Considering constraints imposed by the structural data, we suggest a new simple hypothetical coupling mechanism for the molecular machine.


    Organizational Affiliation

    Structural Biology Brussels, Department of Bioengineering Sciences, Vrije Universiteit Brussel, Brussels, Belgium.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit AA147Escherichia coli BMutation(s): 0 
EC: 7.1.1
Membrane Entity: Yes 
UniProt
Find proteins for P0AFC3 (Escherichia coli (strain K12))
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UniProt GroupP0AFC3
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit HB [auth H]325Escherichia coli BMutation(s): 0 
EC: 7.1.1
Membrane Entity: Yes 
UniProt
Find proteins for P0AFD4 (Escherichia coli (strain K12))
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UniProt GroupP0AFD4
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit JC [auth J]184Escherichia coli BMutation(s): 0 
EC: 7.1.1
Membrane Entity: Yes 
UniProt
Find proteins for P0AFE0 (Escherichia coli (strain K12))
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UniProt GroupP0AFE0
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit KD [auth K]100Escherichia coli BMutation(s): 0 
EC: 7.1.1.2 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit LE [auth L]613Escherichia coli BMutation(s): 0 
EC: 1.6.5.11 (PDB Primary Data), 1.6.5.3 (PDB Primary Data), 1.6.99.5 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for P33607 (Escherichia coli (strain K12))
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit MF [auth M]509Escherichia coli BMutation(s): 0 
EC: 7.1.1
Membrane Entity: Yes 
UniProt
Find proteins for P0AFE8 (Escherichia coli (strain K12))
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit NG [auth N]485Escherichia coli BMutation(s): 0 
EC: 7.1.1
Membrane Entity: Yes 
UniProt
Find proteins for P0AFF0 (Escherichia coli (strain K12))
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)Belgium00281ROEF

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-18
    Type: Initial release