Reference: Teusink B, et al. (1996) Synchronized heat flux oscillations in yeast cell populations. J Biol Chem 271(40):24442-8

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Abstract


Microcalorimetry was adapted to the study of glycolytic oscillations in suspensions of intact yeast cells. A correction procedure was developed for the distortion of the amplitude and phase of the heat signal, caused by the slow response of the calorimeter. This made it possible to observe oscillations in the heat production rate with a period of less than 1 min, and a relative amplitude of 5-10%. By simultaneously measuring the heat flux and concentrations of glycolytic metabolites, and by comparing acetaldehyde-induced phase shifts of the heat flux oscillations with those of NADH oscillations, the heat flux was found to be 100 degrees out of phase with glucose 6-phosphate, 80 degrees out of phase with fructose 1, 6-bisphosphate, and in phase with NADH. The flux measurement made possible by microcalorimetry allowed the recognition of (i) changes in metabolic capacity that may affect glycolytic dynamics, (ii) implications of glucose carrier kinetics for glycolytic dynamics and (iii) the continued requirement for an acetaldehyde trapping agent for the oscillations.

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Journal Article
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Teusink B, Larsson C, Diderich J, Richard P, van Dam K, Gustafsson L, Westerhoff HV
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