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INTERACTION OF VIOLOGEN DYES WITH CHROMATOPHORES AND REACTION‐CENTER PREPARATIONS FROM RHODOSPIRILLUM RUBRUM
Author(s) -
Govindjee Rajni,
Smith William R.
Publication year - 1974
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1974.tb06566.x
Subject(s) - rhodospirillum rubrum , viologen , chromatophore , photosynthetic reaction centre , chemistry , photochemistry , electron acceptor , electron donor , absorption (acoustics) , indophenol , biochemistry , electron transfer , biology , materials science , catalysis , enzyme , fishery , composite material
—Various low‐potential viologen dyes enhance light‐induced absorption changes in the near‐infrared region (ΔA870) in chromatophore preparations from Rhodospirillum rubrum in the presence of dichlorophenol indophenol and a high concentration of ascorbate (DCPIP + asc). An increase in ΔA870 was also observed in large reaction‐center preparations from R. rubrum with viologens in the presence of ascorbate. Our results indicate that E' 0 , of the primary electron acceptor X may be as low as ‐0.37 V, as suggested recently by P. A. Loach (1973, personal communication).