Activities of Carbonic Anhydrase and Carboxylating Enzymes in Chlamydomonas segnis Adapted and Adapting to Air Levels of Carbon Dioxide
スポンサーリンク
概要
- 論文の詳細を見る
Activities of carbonic anhydrase (CA), phosphoenolpyruvate carboxylase (PEPCase) and ribulose 1,5-bisphosphate carboxylase (RuBPCase) were compared in air- and 5% CO_2-adapted and adapting cells of Chlamydomonas segnis during the cell cycle in continuously illuminated synchronous cultures. Air-adapted cells exhibited considerably lower PEPCase activities, but higher RuBPCase and CA activities than 5% CO_2-adapted cells. Most (75 to 88%) of the CA activity in air-adapted cells appeared to be located in the periplasmic space. Transferring 5% CO_2-adapted cells to air scarcely influenced RuBPCase activity, but led to 85% decrease in the activity of PEPCase and to 400% increase in that of CA. In such air-adapting cells, more than half (54 to 70%) of the CA activity was intracellular. The proposal that PEPCase and RuBPCase in addition to CA may be involved in the regulation of inorganic carbon uptake by air-adapted and adapting cells under CO_2-limiting conditions is discussed.
- 日本植物生理学会の論文
著者
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Tan C.
Department Of Botany University Of Manitoba
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Tan C.
Department Of Anatomy Faculty Of Medicine National University Of Singapore
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Badour S.
Department of Botany, University of Manitoba
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Badour S.
Department Of Botany University Of Manitoba
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