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Structure paper

TitleArrangement of electron transport chain components in bovine mitochondrial supercomplex I1III2IV1.
Journal, issue, pagesEMBO J, Vol. 30, Issue 22, Page 4652-4664, Year 2011
Publish dateSep 9, 2011
AuthorsThorsten Althoff / Deryck J Mills / Jean-Luc Popot / Werner Kühlbrandt /
PubMed AbstractThe respiratory chain in the inner mitochondrial membrane contains three large multi-enzyme complexes that together establish the proton gradient for ATP synthesis, and assemble into a supercomplex. ...The respiratory chain in the inner mitochondrial membrane contains three large multi-enzyme complexes that together establish the proton gradient for ATP synthesis, and assemble into a supercomplex. A 19-Å 3D map of the 1.7-MDa amphipol-solubilized supercomplex I(1)III(2)IV(1) from bovine heart obtained by single-particle electron cryo-microscopy reveals an amphipol belt replacing the membrane lipid bilayer. A precise fit of the X-ray structures of complex I, the complex III dimer, and monomeric complex IV indicates distances of 13 nm between the ubiquinol-binding sites of complexes I and III, and of 10-11 nm between the cytochrome c binding sites of complexes III and IV. The arrangement of respiratory chain complexes suggests two possible pathways for efficient electron transfer through the supercomplex, of which the shorter branch through the complex III monomer proximal to complex I may be preferred.
External linksEMBO J / PubMed:21909073 / PubMed Central
MethodsEM (single particle)
Resolution19.0 Å
Structure data

1876

2ybb

EMDB-1876: Structural basis of substrate shuttling in bovine mitochondrial supercomplex I1III2IV1 by single particle cryo-EM
PDB-2ybb: Fitted model for bovine mitochondrial supercomplex I1III2IV1 by single particle cryo-EM (EMD-1876)
Method: EM (single particle) / Resolution: 19.0 Å

Chemicals

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-FMN:
FLAVIN MONONUCLEOTIDE

ChemComp-NAI:
1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE

ChemComp-MG:
Unknown entry

ChemComp-FES:
FE2/S2 (INORGANIC) CLUSTER

ChemComp-CA:
Unknown entry

ChemComp-HEM:
PROTOPORPHYRIN IX CONTAINING FE

ChemComp-SMA:
STIGMATELLIN A

ChemComp-UQ1:
UBIQUINONE-1

ChemComp-HEC:
HEME C

ChemComp-CDL:
CARDIOLIPIN / phospholipid*YM

ChemComp-HEA:
HEME-A

ChemComp-CU:
COPPER (II) ION

ChemComp-ZN:
Unknown entry

ChemComp-HOH:
WATER

Source
  • bos taurus (cattle)
  • thermus thermophilus (bacteria)
  • escherichia coli (E. coli)
KeywordsOXIDOREDUCTASE / SUPERCOMPLEX B / MITOCHONDRIA / RESPIRATORY CHAIN / AMPHIPOL A8-35 / RANDOM CONICAL TILT

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