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Depletion of glycolytic intermediates plays a key role in glucose-phosphate stress in Escherichia coli.

Abstract：

:In bacteria like Escherichia coli, the accumulation of glucose-6-phosphate (G6P) or its analogs such as α-methyl glucoside-6-phosphate (αMG6P) results in stress that appears in the form of growth inhibition. The small RNA SgrS is an essential part of the response that helps E. coli combat glucose-phosphate stress; the growth of sgrS mutants during stress caused by αMG is significantly impaired. The cause of this stress is not currently known but may be due to either toxicity of accumulated sugar-phosphates or to depletion of metabolic intermediates. Here, we present evidence that glucose-phosphate stress results from depletion of glycolytic intermediates. Addition of glycolytic compounds like G6P and fructose-6-phosphate rescues the αMG growth defect of an sgrS mutant. These intermediates also markedly decrease induction of the stress response in both wild-type and sgrS strains grown with αMG, implying that cells grown with these intermediates experience less stress. Moreover, αMG transport assays confirm that G6P relieves stress even when αMG is taken up by the cell, strongly suggesting that accumulated αMG6P per se does not cause stress. We also report that addition of pyruvate during stress has a novel lethal effect on the sgrS mutant, resulting in cell lysis. The phosphoenolpyruvate (PEP) synthetase PpsA, which converts pyruvate to PEP, can confer resistance to pyruvate-induced lysis when ppsA is ectopically expressed in the sgrS mutant. Taken as a whole, these results provide the strongest evidence thus far that depletion of glycolytic intermediates is at the metabolic root of glucose-phosphate stress.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Richards GR,Patel MV,Lloyd CR,Vanderpool CK

doi

10.1128/JB.00705-13

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

4816-25

issue

21

eissn

0021-9193

issn

1098-5530

pii

JB.00705-13

journal_volume

195

pub_type

杂志文章

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