| Autor: |
Johan H. van Heerden, Meike T. Wortel, Frank J. Bruggeman, Joseph J. Heijnen, Yves J.M. Bollen, Robert Planqué, Josephus Hulshof, Tom G. O’Toole, S. Aljoscha Wahl, Bas Teusink |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Microbial Cell, Vol 1, Iss 3, Pp 103-106 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
2311-2638 |
| DOI: |
10.15698/mic2014.01.133 |
| Popis: |
In the model eukaryote Saccharomyces cerevisiae, it has long been known that a functional trehalose pathway is indispensable for transitions to high glucose conditions. Upon addition of glucose, cells with a defect in trehalose 6-phosphate synthase (Tps1), the first committed step in the trehalose pathway, display what we have termed an imbalanced glycolytic state; in this state the flux through the upper part of glycolysis outpaces that through the lower part of glycolysis. As a consequence, the intermediate fructose 1,6-bisphosphate (FBP) accumulates at low concentrations of ATP and inorganic phosphate (Pi). Despite significant research efforts, a satisfactory understanding of the regulatory role that trehalose metabolism plays during such transitions has remained infamously unresolved. In a recent study, we demonstrate that the startup of glycolysis exhibits two dynamic fates: a proper, functional, steady state or the imbalanced state described above. Both states are stable, attracting states, and the probability distribution of initial states determines the fate of a yeast cell exposed to glucose. Trehalose metabolism steers the dynamics of glycolysis towards the proper functional state through its ATP hydrolysis activity; a mechanism that ensures that the demand and supply of ATP is balanced with Pi availability under dynamic conditions. [van Heerden et al. Science (2014), DOI: 10.1126/science.1245114.] |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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