Nov 1, 1975

Photoinduced reduction of NAD(P) in the cells of green sulfur bacteria

Mikrobiologiia
R N Ivanovskiĭ

Abstract

The spectrum of a photoinduced increase in luminescence of the cells of the gree sulphur bacterium Chlorobium limicola f. thiosulfatophilum, within the range of 400 to 520 nm, was found to correspond to the spectrum of luminescence of NADH in the protein-bound form. Photoinduced reduction of NAD(P) in green bacteria, contrary to purple bacteria, is not susceptible to the action of p-chlorocarbonylcyanide phenlhydrazone which uncouples photophosphorylation. Therefore, in Chlorobium limicola f. thiosulfatophilum, NAD(P) is reduced by direct non-cyclic transport of electrons via the photosynthetic chain. NAD(P)H is utilized mainly in the system of CO2 fixation; the process is inhibited by fluoroacetate, and the inhibition is eliminated by substrates of the cycle of carboxylic acids.

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Mentioned in this Paper

Chromatiaceae
Chromatium
Carbonyl Cyanide m-Chlorophenyl Hydrazone
Fluoroacetates
Rhodospirillales
NADP
Oxidation-Reduction
Carbon Dioxide
Rhodopseudomonas
Phosphorescent Measurements

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