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Photosystem P840 reaction-centre cytochrome c-551 A photosynthetic reaction-centre complex is found in certain green sulphur bacteria such as Chlorobium vibrioforme which are anaerobic photo-auto-trophic organisms. The primary electron donor is P840, a probable B-Chl a dimer, and the primary electron acceptor is a B-Chl monomer. Also on the donor side c-type cytochromes are known to function as electron donors to photo-oxidised P840. This family is thus the secondary endogenous donor of the photosynthetic reaction-centre complex and is a membrane-bound cytochrome containing a single haem group. |
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