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Index >> Bacterial Photosynthesis >> Type b Cytochrome

Type b Cytochrome

Type b Cytochrome - There is evidence that a b-type cytochrome IS present in the photosynthetic electron transport system.
Cytochrome b has been demonstrated in Rhodopseudomons sphaeroides (E°‘ = + 50, mV) and R. capsulata (E°' = + 60 mV), and there are indications that it is adjacent to cytochrome c in the cyclic system. It is likely that cytochrome b may be present even in organisms where it has been previously reported to be absent.

Small amounts of cytochrome b could be masked by other substances. Chromatium vinosum and Chlorobium thiosulphatophilum lire reported to contain one molecule of cytochrome b per reaction centre (Knaff and Buchanan, 1975).
It is likely that cytochrome b has a role in cyclic photosynthetic flow in the Chromatiaceae, Chlorobiaceae as well as in the Rhodospirillaceae.

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