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Escherichia coli responds with a rapid and large change in growth rate upon a shift from glucose-limited to glucose-excess conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
31673 44828 2011 12 PDF Available
Title
Escherichia coli responds with a rapid and large change in growth rate upon a shift from glucose-limited to glucose-excess conditions
Abstract

Glucose pulse experiments at seconds time scale resolution were performed in aerobic glucose-limited Escherichia coli chemostat cultures. The dynamic responses of oxygen-uptake and growth rate at seconds time scale were determined using a new method based on the dynamic liquid-phase mass balance for oxygen and the pseudo-steady-state ATP balance. Significant fold changes in metabolites (10–1/10) and fluxes (4–1/4) were observed during the short (200 s) period of glucose excess. During glucose excess there was no secretion of by-products and the increased glucose uptake rate led within 40 s to a 3.7 fold increase in growth rate. Also within 40–60 s a new pseudo-steady-state was reached for both metabolite levels and fluxes. Flux changes of reactions were strongly correlated to the concentrations of involved compounds. Surprisingly the 3.7 fold increase in growth rate and hence protein synthesis rate was not matched by a significant increase in amino acid concentrations. This poses interesting questions for the kinetic factors, which drive protein synthesis by ribosomes.

Keywords
Amino acid metabolism; Central metabolism; Intracellular metabolites-fluxes; In vivo kinetics; Stimulus response experiments
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Escherichia coli responds with a rapid and large change in growth rate upon a shift from glucose-limited to glucose-excess conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 13, Issue 3, May 2011, Pages 307–318
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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