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Metabolism and Enzymology

Evidence of Reentrance of Glycolate Carbon into the Photosynthetic Carbon Reduction Cycle in Photosynthesizing Euglena gracilis Z ¹

Department of Agricultural Chemistry, University of Osaka Prefecture, Sakai, Osaka 591, Japan

Aminooxyacetate induced excretion of glycolate from air-grown cells of Euglena gracilis in both air and 1% CO₂ atmospheres. The rate of the excretion reached 70% of the photosynthetic rate in the air on a carbon basis, and was 10% in 1% CO₂. The compulsory loss of photosynthetically fixed carbon as glycolate at the high rate in air in the presence of aminooxyacetate caused a decrease of the rate of synthesis of paramylon, the reserve polysaccharide. Analyses of the steady levels of photosynthetic intermediates showed that a decrease of the 3-phosphoglycerate level was the cause of the slow rate of paramylon synthesis under these conditions.