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Open Access Highly Accessed Research article

Protein expression dynamics during Escherichia Coli glucose-lactose diauxie

Ekaterina Mostovenko*, André M Deelder and Magnus Palmblad

Author Affiliations

Department of Parasitology, Biomolecular Mass Spectrometry Unit, Leiden University Medical Center, P.O. Box 9600, Zone L04-Q, 2300 RC Leiden, Netherlands

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BMC Microbiology 2011, 11:126  doi:10.1186/1471-2180-11-126

Published: 1 June 2011

Abstract

Background

Escherichia coli is a well-studied anaerobic bacteria which is able to regulate metabolic pathways depending on the type of sugar presented in the medium. We have studied the glucose-lactose shift in E. coli at the protein level using a recently developed mass spectrometry platform.

Method

Cells were grown in minimal medium containing two sugars (glucose and lactose) and analyzed using novel mass spectrometry cluster. The cluster combines the high resolving power and dynamic range of Fourier transform ion cyclotron resonance (FTICR) for accurate mass measurement and quantitation with multiple ion traps for fast and sensitive tandem mass spectrometry. The protein expression profile was followed in time across the glucose-lactose diauxic shift using label-free quantitation from the FTICR data.

Results and Conclusion

The entire dataset was interrogated by KEGG pathway analysis, mapping measured changes in protein abundance onto known metabolic pathways. The obtained results were consistent with previously published gene expression data, with β-galactosidase being the most strongly induced protein during the diauxic shift.

Keywords:
label-free; quantitative mass spectrometry; β-galactosidase; Escherichia coli; glucose-lactose diauxie