Induced formation of ribulose 1,5-diphosphate carboxylase in Rhodopseudomonas spheroides with particular concern to its relation with chromatophore formation

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A comparative study was made on features of the induced synthesis of RuDP carboxylase in three strains of R. spheroides with different blochemical properties. In strains Sb and Sa, which were able to grow under either light-anaerobic or dark-aerobic conditions, activities of RuDP carboxylase in the light-grown cells were much higher than those in dark-grown cells. The level of RuDP carboxylase activity in dark-grown sells of the Sb strain (wild Type strain) increased two to three times in the dark by incubating the heavy cell suspension under low aeration, but, for a further increase in enzyme activity, a light-anaerobic condition was required. This is in contrast to the induced formation of bacteriochlorophyll which has been shown to proceed actively in the dark as well as in the light. On the other hand, with dark-grown cells of the Sa strain, which had possible partial defects in the chlorophyll synthesis system, the induced synthesis of RuDP carboxylase under the light-anaerobic condition was markedly retarded as compared to that with the Sb strain. RuDP carboxylase formation was not induced in L-57 (a colorless mutant) under any of these conditions. The induced formation of RuDP carboxylase, as well as of bacteriochlorophyll, under the light-anaerobic condition was considerably suppressed by hydroxyurea and mitomycin C. This suggests that the genetic control systems of RuDP carboxylase synthesis may be closely related with those for the formation of the photosynthetic apparatus.
日本植物生理学会の論文

Induced formation of ribulose 1,5-diphosphate carboxylase in Rhodopseudomonas spheroides with particular concern to its relation with chromatophore formation

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