Mitochondrial respiratory mutants of Saccharomyces cerevisiae accumulate glycogen and readily mobilize it in a glucose-depleted medium

Article Abstract:

Mitochondrial respiratory mutants of Saccharomyces cerevisiae have been found to accumulate glycogen and mobilize it readily in a medium depleted in glucose. Mitochondrial respiratory mutants accumulated more glycogen than wild-type cells during the fermentative growth on glucose. Wild-type cells only transiently degraded glycogen after glucose was used up.

Mitochondria, Glycogen, Glucose

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A mutation which affects both the specificity of PtsG sugar transport and the regulation of ptsG expression by Mlc in Escherichia coli

Article Abstract:

An Escherichia coli mutation which affects specificity of PtsG sugar transport and regulation of ptsG expression by Mlc has been studied. It has been shown that the IIC mutation is the cause of both the effect on sugar specificity an regulation. Analysis of the two mutations individually present on plasmids was used in the study.

United Kingdom, Escherichia coli, Bacterial genetics, Metabolism, Microbial enzymes, Transferases, Glucosamine, Glucose metabolism

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The glyceraldehyde-3-phosphate dehydrogenase polypeptides encoded by the Saccharomyces cerevisiae TDH1, TDH2 and TDH3 genes are also cell wall proteins

Article Abstract:

The glyceraldehyde-3-phosphate dehydrogenase polypeptides encoded by the Saccharomyces cerevisiae TDH3, TDH2 and TDH1 genes have been found to be cell wall proteins also. The glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase (GAPDH) of S. cerevisiae had been thought to be only on the inside of the cell, but is also in the cell wall. GAPDH activity was found to be intact in wild-type yeast cells. It is proportional to cell number and incubation time. The S. cerevisiae GAPDH encoded by TDH1-3 is part of the family of multifunctional catalytic-activity-retaining, cell-wall-associated GAPDHs being established. Wild-type strains and single and double tdh mutants were studied.

Spain, Cells (Biology), Growth, Membrane proteins, Dehydrogenases, Oxidoreductases, Cells, Cell membranes, Plasma membranes, Polypeptides, Glycolysis

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