Jan 22, 2010

C-type cytochromes in the photosynthetic electron transfer pathways in green sulfur bacteria and heliobacteria

Photosynthesis Research
Chihiro AzaiHirozo Oh-Oka

Abstract

Green sulfur bacteria and heliobacteria are strictly anaerobic phototrophs that have homodimeric type 1 reaction center complexes. Within these complexes, highly reducing substances are produced through an initial charge separation followed by electron transfer reactions driven by light energy absorption. In order to attain efficient energy conversion, it is important for the photooxidized reaction center to be rapidly rereduced. Green sulfur bacteria utilize reduced inorganic sulfur compounds (sulfide, thiosulfate, and/or sulfur) as electron sources for their anoxygenic photosynthetic growth. Membrane-bound and soluble cytochromes c play essential roles in the supply of electrons from sulfur oxidation pathways to the P840 reaction center. In the case of gram-positive heliobacteria, the photooxidized P800 reaction center is rereduced by cytochrome c-553 (PetJ) whose N-terminal cysteine residue is modified with fatty acid chains anchored to the cytoplasmic membrane.

  • References50
  • Citations7

References

Mentioned in this Paper

Gram-Positive Bacteria
Biochemical Pathway
Sulfides
Chlorobiaceae
Complex (molecular entity)
Electron Transport
Sulfur
Sulfur Compounds
Cytochrome c Group
Soluble

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