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Journal of Bacteriology, October 1999, p. 6425-6440, Vol. 181, No. 20
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Functional Genomics: Expression Analysis of
Escherichia coli Growing on Minimal and Rich Media
Han
Tao,1
Christoph
Bausch,1
Craig
Richmond,2
Frederick R.
Blattner,2 and
Tyrrell
Conway1,*
Department of Microbiology, The Ohio State
University, Columbus, Ohio 43210-1292,1 and
Department of Genetics, University of Wisconsin, Madison,
Wisconsin 537062
Received 1 June 1999/Accepted 6 August 1999
DNA arrays of the entire set of Escherichia coli genes
were used to measure the genomic expression patterns of cells growing in late logarithmic phase on minimal glucose medium and on Luria broth
containing glucose. Ratios of the transcript levels for all 4,290 E. coli protein-encoding genes (cds) were obtained, and
analysis of the expression ratio data indicated that the physiological state of the cells under the two growth conditions could be
ascertained. The cells in the rich medium grew faster, and expression
of the majority of the translation apparatus genes was significantly elevated under this growth condition, consistent with known patterns of
growth rate-dependent regulation and increased rate of protein synthesis in rapidly growing cells. The cells grown on minimal medium
showed significantly elevated expression of many genes involved in
biosynthesis of building blocks, most notably the amino acid
biosynthetic pathways. Nearly half of the known RpoS-dependent genes
were expressed at significantly higher levels in minimal medium than in
rich medium, and rpoS expression was similarly elevated.
The role of RpoS regulation in these logarithmic phase cells was
suggested by the functions of the RpoS dependent genes that were
induced. The hallmark features of E. coli cells growing on
glucose minimal medium appeared to be the formation and excretion of
acetate, metabolism of the acetate, and protection of the cells from
acid stress. A hypothesis invoking RpoS and UspA (universal stress
protein, also significantly elevated in minimal glucose medium) as
playing a role in coordinating these various aspects and consequences
of glucose and acetate metabolism was generated. This experiment
demonstrates that genomic expression assays can be applied in a
meaningful way to the study of whole-bacterial-cell physiology for the
generation of hypotheses and as a guide for more detailed studies of
particular genes of interest.
*
Corresponding author. Present address: Department of
Botany and Microbiology, 770 VanVleet Oval, University of Oklahoma,
Norman, OK 73019-0245. Phone: (405) 325-1683. Fax: (405) 325-7619. E-mail: tconway{at}ou.edu.
Journal of Bacteriology, October 1999, p. 6425-6440, Vol. 181, No. 20
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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