Activity of the plasma membrane H+ -ATPase and optimal glycolytic flux are required for rapid adaptation and growth of Saccharomyces cerevisiae in the presence of the weak-acid preservative sorbic acid

Article Abstract:

The adaptation of Saccharomyces cerevisiae cells to the weak-acid preservative sorbic acid depends on the proton-exporting activity of the membrane H+ -ATPase and the production of optimal glycolytic flux. The adaptation involves a decrease in the cellular ATP content. This decrease is due to an increase in ATP usage rather than a decrease in ATP generation. Sorbic acid fails to affect ATP synthesis as the generation of carbon-dioxide and consumption of oxygen are unaffected.

Observations, Biological transport, Saccharomyces, Sorbic acid, Sorbates

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Comparative acid tolerances and inhibitor sensitivities of isolated F-ATPases of oral lactic acid bacteria

Article Abstract:

The acid tolerances and inhibitor sensitivities of F-ATPases, isolated by detergent extraction, from three oral lactic acid bacteria, Lactobacillus casei ATCC 4646, Streptococcus mutans GS-5 and Streptococcus sanguis NCTC 10904, were compared. The pH optima for activity of the membrane-associated enzymes reflected the overall acid tolerances of the organisms. Fluoroaluminate complexes were inhibitory for isolated F(sub 1)F(sub 0) and F(sub 1) enzymes.

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Involvement of manganese in conversion of phenylalanine to benzaldehyde by lactic acid bacteria

Article Abstract:

The role of Mn(II) in conversion of phenylalanine to benzaldehyde by lactic acid bacteria (LAB) is discussed. Mn(II) is involved by catalyzing the conversion of phenylpyruvic acid. Experiments performed with various lactic acid bacterial strains of different genera showed benzaldehyde formation in a strain to be associated with a high Mn(II) level.

Netherlands, Statistical Data Included, Lactobacillus, Transferases, Molecular microbiology, Metal ions, Phenylalanine

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