Is a constant low-entropy process at the root of glycolytic oscillations?
We measured temporal oscillations in thermodynamic variables such as temperature, heat flux, and cellular volume in suspensions of non-dividing yeast cells which exhibit temporal glycolytic oscillations. Oscillations in these variables have the same frequency as oscillations in the activity of intracellular metabolites, suggesting strong coupling between them. These results can be interpreted in light of a recently proposed theoretical formalism in which isentropic thermodynamic systems can display coupled oscillations in all extensive and intensive variables, reminiscent of adiabatic waves. This interpretation suggests that oscillations may be a consequence of the requirement of living cells for a constant low-entropy state while simultaneously performing biochemical transformations, i.e., remaining metabolically active. This hypothesis, which is in line with the view of the cellular interior as a highly structured and near equilibrium system where energy inputs can be low and sustain regular oscillatory regimes, calls into question the notion that metabolic processes are essentially dissipative.
KeywordsGlycolytic oscillations Isentropic process Temperature oscillations Onsager’s theory Association-induction hypothesis
HST and LFO thank the Danish Council for Independent Research|Natural Sciences for support. LAB is a member of the Argentinian Research Council (CONICET) research career. The authors thank Anita Lunding for skilled technical assistance.
This study was funded by a grant from the Danish Council for Independent Research|Natural Sciences (grant # DFF - 4002-00465).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
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