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The Rhodospirillum Rubrum Cytochrome bc1, Complex

  • David B. Knaff
Part of the FEMS Symposium book series (FEMSS)

Abstract

The cytochrome bc 1 complex was first characterized as one of the membrane-bound, multipeptide complexes of the mitochondrial electron transport chain. Subsequently, functionally equivalent cytochrome bc 1 complexes were discovered in the photosynthetic and respiratory chains of bacteria. These complexes, and the related cytochrome b 6f complexes of oxygenic photosynthetic organisms, play a central role in energy transduction associated with photosynthetic and respiratory electron transfer, as the electron flow from quinol to cytochrome c catalyzed by the complexes is coupled to the formation of a proton gradient and an electrical potential across the membrane(1-3). The cytochrome bc 1 complexes of photosynthetic purple non-sulfur bacteria have proven particularly useful for studying the pathway of electron movement for the following reasons:1. The ability to perform kinetic measurements after electron flow is initiated by a short, single-turnover light flash has provided a detailed sequence of electron transfer steps in Rhodobacter sphaeroides and Rhodobacter capsulatus(4,5) and, to a lesser extent, in Rhodospirillum rubrum (6); 2. While the electron-carrying chromophore content of the complexes isolated from photosynthetic bacteria and mitochondria are identical, the peptide compositions of the former are much simpler than those of mitochondria(i.e., three or four vs. ten subunits-Ref. 1,3,7); 3. The amino acid sequences, deduced from the nucleotide sequences of the corresponding genes, are known for all three chromophorecontaining subunits of the Rb. capsulatus complex(8,9). Sequences should be available soon for the Rb. sphaeroides and Rhodopseudomonas viridis complexes (A.R. Crofts and D. Oesterhelt, peronal communications) and sequence work is beginning on the R. rubrum complex(See below). The R. rubrum cytochrome bc 1 complex(10,11) has several additional advantages, including its unambiguous three peptide subunit composition, its stability and the fact that it contains a high affinity binding site for its electron acceptor, cytochrome c 2(12).

Keywords

Photosynthetic Bacterium Electron Spin Echo Envelope Modulation Resonance Raman Spectrum Rieske Protein Electron Spin Echo Envelope Modulation Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • David B. Knaff
    • 1
  1. 1.Department of Chemistry and BiochemistryTexas Tech UniversityLubbockUSA

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