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Transcriptional translational and assembly control of the large subunit of ribulose 1 5 bisphosphate carboxylase oxygenase during the cell cycle of euglena gracilis


, : Transcriptional translational and assembly control of the large subunit of ribulose 1 5 bisphosphate carboxylase oxygenase during the cell cycle of euglena gracilis. Journal of Plant Physiology 134(4): 420-426

Mass culture of Euglena gracilis were synchronized by a light-dark-change of 14 h light and 10 h dark. The amount of soluble chloroplast proteins doubled during the light-time. After a lag-phase of 4 h the amount of the small as well as of the large subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase increased in parallel. In the second part of the light-time, however, the amount of large subunits decreased temporarily for about 4 h, whereas the amount of small subunits increased throughout the whole light-time of the cell cycle. This discrepancy caused a decrease in the ratio of large subunits/small subunits during the second part of the light-time, which was also accompanied by a drastic change in the stoichiometry of the Rubisco holoenzyme during this developmental stage. In the following dark-time the "normal" stoichiometry of the Rubisco holoenzyme was established. The amount of the large subunit mRNA was highest after the light and had its lowest level at the end of the dark-time. Large subunits were synthesized only during the light-time, with a maximum at about the 12th h. This maximum coincided with a 50%-level of the mRNA amount for the large subunit. The synthesis of the large subunit is therefore regulated on the level of translation. The results are discussed in relation to regulation mechanisms at the level of transcription or translation as well as to the assembly/dissociation of the Rubisco holoenzyme.

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