Regulation of the Synthesis of Ribulose‐1,5‐Bisphosphate Carboxylase and Its Subunits in the Flagellate Chlorogonium elongatum

Publisher Website
Google Scholar
Abstract
Shifting of heterotrophically cultured cells of C. elongatum to autotrophic culture conditions results in a more than ten-fold increase in the level of the chloroplastic enzyme ribulose-1,5-bisphosphate carboxylase. This increase in enzyme amount is caused by an increased synthesis of the enzyme de novo under autotrophic culture conditions. The rate of enzyme degradation is low and very similar under both growth conditions. The synthesis of the enzyme is mainly under the control of 2 factors. Light promotes the synthesis, while acetate, the carbon source of this organism, has a strong inhibitory effect on this process. Since a mutant lacking chlorophyll shows a normal response to the change of culture conditions the chlorophylls can be ruled out as photoreceptors.