NITRATE REDUCTASE IN PHOTOSYNTHETIC BACTERIUM, RHODOSPIRILLUM RUBRUM. ADAPTIVE FORMATION OF NITRATE REDUCTASE

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概要

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• 1. A method was discovered for adapting the cells of Rhodospirillum rubrum to grow on a nitrate medium, a capacity initially lacking in the organism. The adapted cells were able to grow with nitrate as the sole source of nitrogen. The growth responses of the adapted cells towards various nitrogenous sources were investigated under various conditions of incubation (aero- and anaerobiosis, light and dark). 2. The adapted cells were found to have simultaneously acquired the capacity for reducing nitrite and hydroxylamine as well as nitrate. The path of nitrogen in the adapted cells was assumed to be as follows : NO^-_3 → NO^-_2 → NH_2OH → Cellular Nitrogen. 3 Nitrate metabolism of the adapted cells was investigated under various conditions. In the light, nitrate was reduced and further assimilated, leaving insignificant amounts of nitrite in the medium. In this case, consumption of nitrate was markedly inhibited by other forms of nitrogen (e.g., nitrite, hydroxylamine, amino acids and ammonium salts). In the dark, nitrate was reduced as the terminal hydrogen acceptor in the oxidative breakdown of organic substances (e.g., malate) in the medium (i.e., nitrate respiration). More nitrite was accumulated in this case than in the light. Molecular oxygen inhibited the reduction of, as well as the growth on, nitrate in any of the above cases. 4. The effects on the rate of nitrate reduction (and respiratory oxygen uptake) caused by various experimental factors (pH, nitrate concentration, electron donors, and addition of hydroxylamine) were investigated, using the resting cells of the adapted organism.

• 日本植物生理学会の論文

著者

• Katoh Tetzuya

  Departrnent Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo

• Katoh Tetzuya

  Department Of Bioscience Tokyo University Of Agriculture

• Katoh T.

  Departrnent of Biophysics and Biochemistry, Faculty of Science, University of Tokyo

• Katoh T.

  Department of Physics, Faculty of Science, Osaka University

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