Feb 21, 2019

Global Lysine Acetylation in Escherichia coli Results from Growth Conditions That Favor Acetate Fermentation

Journal of Bacteriology
Birgit SchillingChristopher V Rao

Abstract

Lysine acetylation is thought to provide a mechanism for regulating metabolism in diverse bacteria. Indeed, many studies have shown that the majority of enzymes involved in central metabolism are acetylated and that acetylation can alter enzyme activity. However, the details regarding this regulatory mechanism are still unclear, specifically with regard to the signals that induce lysine acetylation. To better understand this global regulatory mechanism, we profiled changes in lysine acetylation during growth of Escherichia coli on the hexose glucose or the pentose xylose at both high and low sugar concentrations using label-free mass spectrometry. The goal was to see whether lysine acetylation differed during growth on these two different sugars. No significant differences, however, were observed. Rather, the initial sugar concentration was the principal factor governing changes in lysine acetylation, with higher sugar concentrations causing more acetylation. These results suggest that acetylation does not target specific metabolic pathways but rather simply targets accessible lysines, which may or may not alter enzyme activity. They further suggest that lysine acetylation principally results from conditions that favor accumula...Continue Reading

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Mentioned in this Paper

Study
acetyl phosphate
Hexoses
Environment
Nutrients
Pentoses
Carbon
Lysine
L-lysine Catabolic Process to Acetate
Objective (Goal)

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