Effect of Oxidative Phosphorylation Inhibitors on The Glycolytic Flux in Torulopsis glabrata
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This work was supported by grants from The Natural Science Foundation of Jiangsu Province (BK2002072), The Postgraduate Innovation Project of Jiangsu Province, The Scienfific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry and The Ph.D. Programs Foundation of Ministry of Education of China 20040294003).

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    Abstract:

    The relationship between the concentration of intracellular ATP and the glycolytic flux in Torulopsis glabrata was studied by adding oxidative phosphorylation inhibitors (rotenone, antimycin A and oligomycin). When 10 mg/L rotenone and antimycin A were added to the cell cultures, the concentrations of intracellular ATP were approximately 43% and 27.7% less than that of the control, respectively. The specific activity of phosphofructokinase, one of the rate limiting enzymes of the glycolytic pathway, increased by a factors of 3.4 and 2.3, in comparison of the control respectively. With the specific activity of phosphofructokinase increased, the rate of glucose consumed increased by a factor of 3.6 and 2.4 compared with the control, and the rate of pyruvate produced increased by 17% and 8.5% respectively. The specific activities of hexokinase and pyruvate kinase were not affected by the addition of rotenone or antimycin A. Furthermore, the concentration of intracellular ATP decreased by 64.3% upon addition of 0.05 mg/L oligomycin to the cell culture, and the growth of Torulopsis glabrata was ceased when 0.4 mg/L oligomycin was added to the culture broth at 24 h. Both the rate of glucose consumed and the rate of pyruvate produced were enhanced with increasing the concentration of oligomycin ( < 0.6 mg/L) in the cell cultures. As a result, the activity of phosphofructokinase (r2=0.9971), the rate of glucose consumed (r2=0.9967) and the rate of pyruvate produced (r2=0.965) were enhanced by a decrease in the energy level of the cell (the concentration of intracellular ATP). Increase of the rate of glucose consumed rooted in elevation of the specific activity of phosphofructokinase (r2=0.9958) and pyruvate kinase (r2=0.8706). These results are the first answer to the fundamental question of what controls the flux through glycolysis in Torulopsis glabrata.

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LIU Li-Ming, CHEN Jian, LI Hua-Zhong, LI Yin. Effect of Oxidative Phosphorylation Inhibitors on The Glycolytic Flux in Torulopsis glabrata[J]. Progress in Biochemistry and Biophysics,2005,32(3):251-257

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