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[Effect of the artificial electron acceptor reumycin on the nature of an intermediate accumulated by Pseudomonas aeruginosa bacteria].

We investigated the effect of the autooxidizable electron acceptor reumicin on the oversynthesis of intermediates by the bacterium Pseudomonas aeruginosa during its growth limitation by a nitrogen source. Addition of reumicin which accepted the reducing equivalents from NADH(+)-dehydrogenase of the respiratory chain was shown to reduce the rate of alpha-ketoglutarate formation and yield, and to induce the synthesis and excretion of pyruvate into the cultivation medium. The maximal accumulation of pyruvate was observed when reumicin was added at a concentration of 0.4-0.5 mM. It is concluded that the nature of the overproduced intermediate, the rate of its biosynthesis and yield depend on the extent of reducibility of the pyridine nucleotide pool. The oversynthesis of alpha-ketoglutarate is suppressed by chloramphenicol, a protein synthesis inhibitor, which points to a possible involvement of inducible systems including the carriers of the acids via the cytoplasmic membrane.