Abstract
After aerobically grown Euglena gracilis was transferred to anaerobic conditions, the ATP level in the cells immediately decreased. Then, when O 2 concentration in the medium decreased to less than 1 μM, wax ester fermentation, the anaerobic energy-generating system, operated and the ATP level was restored. The cellular level of fructose-2,6-bisphosphate (Fru-2,6-P 2) also decreased immediately after the transfer, and markedly increased corresponding to the onset of fermentation. The activity of pyrophosphate: d-fructose-6-phosphate 1-phosphotransferase (PPi-PFK) changed depending on the Fru-2,6-P 2 level. The activity in vivo of PPi-PFK was much higher than the metabolic rate of glycolysis during wax ester fermentation. From the results, the physiological function of PPi-PFK in E. gracilis is discussed.
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