Electron transfer by domain movement in cytochrome bc1

The cytochrome bc 1 is one of the three major respiratory enzyme complexes residing in the inner mitochondrial membrane. Cytochrome bc 1 transfers electrons from ubiquinol to cytochrome c and uses the energy thus released to form an electrochemical gradient across the inner membrane. Our X-ray cryst...

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Veröffentlicht in:Nature (London) 1998-04, Vol.392 (6677), p.677-684
Hauptverfasser: Zhang, Zhaolei, Huang, Lishar, Shulmeister, Vladimir M., Chi, Young-In, Kim, Kyeong Kyu, Hung, Li-Wei, Crofts, Antony R., Berry, Edward A., Kim, Sung-Hou
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container_end_page 684
container_issue 6677
container_start_page 677
container_title Nature (London)
container_volume 392
creator Zhang, Zhaolei
Huang, Lishar
Shulmeister, Vladimir M.
Chi, Young-In
Kim, Kyeong Kyu
Hung, Li-Wei
Crofts, Antony R.
Berry, Edward A.
Kim, Sung-Hou
description The cytochrome bc 1 is one of the three major respiratory enzyme complexes residing in the inner mitochondrial membrane. Cytochrome bc 1 transfers electrons from ubiquinol to cytochrome c and uses the energy thus released to form an electrochemical gradient across the inner membrane. Our X-ray crystal structures of the complex from chicken, cow and rabbit in both the presence and absence of inhibitors of quinone oxidation, reveal two different locations for the extrinsic domain of one component of the enzyme, an iron–sulphur protein. One location is close enough to the supposed quinol oxidation site to allow reduction of the Fe–S protein by ubiquinol. The other site is close enough to cytochrome c 1 to allow oxidation of the Fe–S protein by the cytochrome. As neither location will allow both reactions to proceed at a suitable rate, the reaction mechanism must involve movement of the extrinsic domain of the Fe–S component in order to shuttle electrons from ubiquinol to cytochrome c 1 . Such a mechanism has not previously been observed in redox protein complexes.
doi_str_mv 10.1038/33612
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subjects Analytical, structural and metabolic biochemistry
Animals
Antimycin A - analogs & derivatives
Antimycin A - metabolism
Binding Sites
Biological and medical sciences
Cattle
Chemical reactions
Chickens
Crystallography
Crystallography, X-Ray
Cytochrome
Cytochrome c Group - chemistry
Electrochemistry
Electron Transport
Electron Transport Complex III - chemistry
Electrons
Enzymes
Enzymes and enzyme inhibitors
Fundamental and applied biological sciences. Psychology
Humanities and Social Sciences
Humans
Iron-Sulfur Proteins - chemistry
Membranes
Metabolism
Methacrylates
Models, Chemical
Models, Molecular
multidisciplinary
Oxidation
Oxidation-Reduction
Oxidoreductases
Polyenes - metabolism
Protein Conformation
Rabbits
Respiratory system
Science
Science (multidisciplinary)
Thiazoles - metabolism
title Electron transfer by domain movement in cytochrome bc1
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