Abstract
The relationship between the metabolic flux and the activities of the pyruvate branching enzymes of Rhizopus oryzae As 3.2686 during l-lactate fermentation was investigated using the perturbation method of aeration. The control coefficients for five enzymes, pyruvate dehydrogenase (PDH), pyruvate carboxylase (PC), pyruvate decarboxylase (PDC), lactate dehydrogenase (LDH), and alcohol dehydrogenase (ADH), were calculated. Our results indicated significant correlations between PDH and PC, PDC and LDH, PDC and ADH, LDH and ADH, and PDC and PC. It also appeared that PDH, PC, and LDH strongly controlled the l-lactate flux; PDH and ADH strongly controlled the ethanol flux; while PDH and PC strongly controlled the acetyl coenzyme A flux and the oxaloacetate flux. Further, the flux control coefficient curves indicated that the control of the system gradually transferred from PDC to PC during the steady state. Therefore, PC was the key rate-limiting enzyme that controls the flux distribution.
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Acknowledgments
This work was funded by the National Natural Science Foundation of China (No. 31071636/31171741) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No. 2010JYLH0837).
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W. Ke and S. Chang contributed equally to this work.
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Ke, W., Chang, S., Chen, X. et al. Metabolic control analysis of l-lactate synthesis pathway in Rhizopus oryzae As 3.2686. Bioprocess Biosyst Eng 38, 2189–2199 (2015). https://doi.org/10.1007/s00449-015-1458-8
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DOI: https://doi.org/10.1007/s00449-015-1458-8