In Silico Modeling of Crabtree Effect.

Area of Science:

• Biochemistry
• Metabolic Engineering
• Systems Biology

Background:

• The Crabtree effect, characterized by high glycolytic activity even with oxygen present, is observed in yeast and shares similarities with metabolic processes in mammalian cancer cells.
• Understanding the Crabtree effect is crucial due to its implications in cellular metabolism and disease.

Purpose of the Study:

• To elucidate the mechanisms of metabolic activities in glycolysis and oxidative phosphorylation during the Crabtree effect in Saccharomyces cerevisiae.
• To investigate the impact of hexose phosphates on respiratory chain complexes and respiration inhibition.
• To explore the enhancement of fermentation in response to elevated glucose concentrations and its relevance to cancer metabolism.

Main Methods:

• Comparative laboratory experiments were conducted to study the inhibitory role of fructose 1,6-bisphosphate on metabolic respiration.
• An in silico model of the Crabtree effect was developed and simulated using COPASI and SNOOPY tools.
• Simulations were performed for varying concentrations of glucose and hexose phosphates.

Main Results:

• Increased glucose concentration leads to higher ethanol production and promotes glycolytic activity towards fermentation.
• Fructose 1,6-bisphosphate was found to have an inhibitory role in metabolic respiration.
• The in silico model successfully simulated the metabolic responses under different substrate concentrations.

Conclusions:

• The study demonstrates that elevated glucose concentrations drive glycolytic activity towards fermentation, a hallmark of the Crabtree effect.
• The findings highlight the significance of the Crabtree effect in yeast as a model for understanding cancer cell metabolism.
• The developed in silico model provides a valuable tool for further research into metabolic regulation.