Abstract
This paper presents an integrated model describing the control of Saccharomyces cerevisiae yeast cells bioenergetics. This model describes the oxidative and respirofermentative metabolism. The model assumes that the mitochondria of the Saccharomyces cerevisiae cells are charged with NADH during the tricarboxylic acid cycle, and NADH is discharged from mitochondria later in the electron transport system. Selected effects observed in the Saccharomyces cerevisiae eucaryotic cells, including the Pasteur's and Crabtree effects, are also modeled.
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Abbreviations
- TCA:
-
Tricarboxylic acid
- V(+)NADH :
-
The rate of mitochondria charging with NADH
- V(-)NADH :
-
The rate of NADH discharging from mitochondria
- fATP:
-
Positive feedback for ATP
- cycle(n) :
-
The nth DOC oscillation cycle
- portion(n) :
-
The nth glucose portion
- DOC:
-
Dissolved O2 concentration in the culture medium
- DOCset :
-
The set value of DOC
- RQ:
-
Respiratory quotient
- RQset :
-
The set value of RQ
- RQ0 :
-
The respiratory quotient when no ethanol is being produced
- RQmax :
-
The maximum value of respiratory quotient in the current DOC oscillation cycle
- RQmax(n) :
-
The maximum value of respiratory quotient in the nth DOC oscillation cycle
- MaxGluCon:
-
The maximum value of glucose concentration in the culture medium in the DOC oscillation cycle
- GluCon:
-
The glucose concentration in the culture medium
- GluConcritical :
-
The critical value of glucose concentration, denotes such glucose concentration in the culture medium which, if exceeded, causes fermentation in good aerobic conditions
- mtNADHmin :
-
The minimal level of intramitochondrial NADH
- mtNADHnormal :
-
The normal level of intramitochondrial NADH
- mtNADHcritical :
-
The critical level of intramitochondrial NADH
- EPR:
-
The ethanol production rate
- OUR:
-
The oxygen uptake rate
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Acknowledgments
I am grateful to Prof. Tadeusz Lachowicz at the University of Wroclaw, Poland and Prof. Mykhailo V. Gonchar from the Institute of Cell Biology, NAS, Ukraine for their help and critical reading of this article. I am also sincerely indebted to Prof. Tadeusz Miskiewicz and Ms Alicja Stempniak from the Department of Bioprocess Engineering, Wroclaw University of Economics, Poland, for their help in the preparation and execution of my experiments.
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Kasperski, A. Modelling of Cells Bioenergetics. Acta Biotheor 56, 233–247 (2008). https://doi.org/10.1007/s10441-008-9050-0
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DOI: https://doi.org/10.1007/s10441-008-9050-0