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Metabolic efficiency in yeast Saccharomyces cerevisiae in relation to temperature dependent growth and biomass yield by Maksim Zakhartsev; Xuelian Yang; Matthias Reuss; Hans Otto Pörtner is a Environmental Science article available to read on EtoBox.

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Canonized view on temperature effects on growth rate of microorganisms is based on assumption of protein denaturation, which is not confirmed experimentally so far. We develop an alternative concept, which is based on view that limits of thermal tolerance are based on imbalance of cellular energy allocation. Therefore, we investigated growth suppression of yeast Saccharomyces cerevisiae in the supraoptimal temperature range (30-40°C), i.e. above optimal temperature (Topt). The maximal specific growth rate (μmax) of biomass, its concentration and yield on glucose (Yx/glc) were measured across the whole thermal window (5-40°C) of the yeast in batch anaerobic growth on glucose. Specific rate of glucose consumption, specific rate of glucose consumption for maintenance (mglc), true biomass yield on glucose (Yx/glc(true)), fractional conservation of substrate carbon in product and ATP yield on glucose (Yatp/glc) were estimated from the experimental data. There was a negative linear relationship between ATP, ADP and AMP concentrations and specific growth rate at any growth conditions, whilst the energy charge was always high (~0.83). There were two temperature regions where mglc differed

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Author

Maksim Zakhartsev; Xuelian Yang; Matthias Reuss; Hans Otto Pörtner

Publisher

Elsevier BV

Published

2015

Language

EN

Field

Environmental Science (Life Sciences)