1. In Saccharomyces cerevisiae, withdrawal of the carbon source results in detachment of glycolytic enzymes from the cytoskeleton and in actin reorganization.
- Author
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Espinoza-Simón E, Chiquete-Félix N, Morales-García L, Pedroza-Dávila U, Pérez-Martínez X, Araiza-Olivera D, Torres-Quiroz F, and Uribe-Carvajal S
- Subjects
- Cytoskeleton ultrastructure, Fermentation, Glucose metabolism, Glyceraldehyde-3-Phosphate Dehydrogenases metabolism, Microfilament Proteins metabolism, Oxidative Phosphorylation, Phosphoglycerate Kinase metabolism, Saccharomyces cerevisiae enzymology, Saccharomyces cerevisiae ultrastructure, Actin Cytoskeleton ultrastructure, Actins metabolism, Cytoskeleton enzymology, Glycolysis, Saccharomyces cerevisiae metabolism, Saccharomyces cerevisiae Proteins metabolism
- Abstract
Metabolons are dynamic associations of enzymes catalyzing consecutive reactions within a given pathway. Association results in enzyme stabilization and increased metabolic efficiency. Metabolons may use cytoskeletal elements, membranes and membrane proteins as scaffolds. The effects of glucose withdrawal on a putative glycolytic metabolon/F-actin system were evaluated in three Saccharomyces cerevisiae strains: a WT and two different obligate fermentative (OxPhos-deficient) strains, which obtained most ATP from glycolysis. Carbon source withdrawal led to inhibition of fermentation, decrease in ATP concentration and dissociation of glycolytic enzymes from F-actin. Depending on the strain, inactivation/reactivation transitions of fermentation took place in seconds. In addition, when ATP was very low, green fluorescent protein-labeled F-actin reorganized from highly dynamic patches to large, non-motile actin bodies containing proteins and enzymes. Glucose addition restored fermentation and cytoskeleton dynamics, suggesting that in addition to ATP concentration, at least in one of the tested strains, metabolon assembly/disassembly is a factor in the control of the rate of fermentation., (Copyright © 2019 The Author(s). Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2020
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