Abstract

The photo-metabolism of aromatic acids by Rhodopseudomonas palustris is sensitive to the presence of exogenous fatty acids. Long-chain fatty acids produced during disruption of the cell and associated with the chromatophore particles cause severe inhibition of benzoate and p-hydroxybenzoate photoassimilation when added to a suspension of intact cells. The main component of the isolated fatty acids was an octadecamonoenoic acid with minor amounts of stearic, palmitic, and palmitoleic acids. The photometabolism of acetate or malate, or the aerobic oxidation of p-hydroxybenzoate, appeared not to be affected. Oleic or linolenic acids caused high inhibition while strong detergents had much less effect on benzoate photometabolism. Monocarboxylic acid homologues, as low as propionate, and dicarboxylic acids were also inhibitory.

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