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TitleInfluence of the RelA activity on E. coli metabolism by metabolite profiling of glucose-limited chemostat cultures
Author(s)Carneiro, S.
Villas-Bôas, S. G.
Ferreira, E. C.
Rocha, I.
Metabolite profiles
Stringent response
Relaxed phenotype
Issue date2012
Abstract(s)Metabolite profiling of E. coli W3110 and the isogenic ∆relA mutant cells was used to characterize the RelA-dependent stringent control of metabolism under different growth conditions. Metabolic profiles were obtained by gas chromatography–mass spectrometry (GC-MS) analysis and revealed significant differences between E. coli strains grown at different conditions. Major differences between the two strains were assessed in the levels of amino acids and fatty acids and their precursor metabolites, especially when growing at the lower dilution rates, demonstrating differences in their metabolic behavior. Despite the fatty acid biosynthesis being the most affected due to the lack of the RelA activity, other metabolic pathways involving succinate, lactate and threonine were also affected. Overall, metabolite profiles indicate that under nutrient-limiting conditions the RelA-dependent stringent response may be elicited and promotes key changes in the E. coli metabolism.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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