4HE8

Crystal structure of the membrane domain of respiratory complex I from Thermus thermophilus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

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Literature

Crystal structure of the entire respiratory complex I.

Baradaran, R.Berrisford, J.M.Minhas, G.S.Sazanov, L.A.

(2013) Nature 494: 443-448

  • DOI: 10.1038/nature11871
  • Primary Citation of Related Structures:  
    4HEA, 4HE8

  • PubMed Abstract: 
  • Complex I is the first and largest enzyme of the respiratory chain and has a central role in cellular energy production through the coupling of NADH:ubiquinone electron transfer to proton translocation. It is also implicated in many common human neurodegenerative diseases ...

    Complex I is the first and largest enzyme of the respiratory chain and has a central role in cellular energy production through the coupling of NADH:ubiquinone electron transfer to proton translocation. It is also implicated in many common human neurodegenerative diseases. Here, we report the first crystal structure of the entire, intact complex I (from Thermus thermophilus) at 3.3 Å resolution. The structure of the 536-kDa complex comprises 16 different subunits, with a total of 64 transmembrane helices and 9 iron-sulphur clusters. The core fold of subunit Nqo8 (ND1 in humans) is, unexpectedly, similar to a half-channel of the antiporter-like subunits. Small subunits nearby form a linked second half-channel, which completes the fourth proton-translocation pathway (present in addition to the channels in three antiporter-like subunits). The quinone-binding site is unusually long, narrow and enclosed. The quinone headgroup binds at the deep end of this chamber, near iron-sulphur cluster N2. Notably, the chamber is linked to the fourth channel by a 'funnel' of charged residues. The link continues over the entire membrane domain as a flexible central axis of charged and polar residues, and probably has a leading role in the propagation of conformational changes, aided by coupling elements. The structure suggests that a unique, out-of-the-membrane quinone-reaction chamber enables the redox energy to drive concerted long-range conformational changes in the four antiporter-like domains, resulting in translocation of four protons per cycle.


    Organizational Affiliation

    Medical Research Council Mitochondrial Biology Unit, Wellcome Trust/MRC Building, Hills Road, Cambridge CB2 0XY, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 7A, H [auth B]119Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo7TTHA0084
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q56217 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 10I [auth D], B [auth J]176Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo10TTHA0093
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q56225 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 11J [auth E], C [auth K]95Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo11TTHA0094
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 12K [auth F], D [auth L]606Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo12TTHA0095
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q56227 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 13L [auth G], E [auth M]469Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo13TTHA0096
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 14M [auth I], F [auth N]427Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo14TTHA0097
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q56229 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
NADH-quinone oxidoreductase subunit 8N [auth C], G [auth H]365Thermus thermophilus HB8Mutation(s): 0 
Gene Names: nqo8TTHA0091
EC: 1.6.5.3 (PDB Primary Data), 7.1.1 (UniProt)
Membrane Entity: Yes 
UniProt
Find proteins for Q60019 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.26α = 91.91
b = 120.54β = 95.73
c = 176.66γ = 101.41
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHASERphasing
PHENIXrefinement
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-13
    Type: Initial release
  • Version 1.1: 2013-03-13
    Changes: Database references