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Induction of a Global Stress Response During the First Step of Escherichia Coli Plate Growth

Overview
Journal Appl Environ Microbiol
Specialties Environmental Health
Microbiology
Date 2006 Dec 5
PMID 17142356
Citations 29
Authors
Caroline Cuny
Maialene Lesbats
Sam Dukan
Affiliations
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Abstract

We have investigated the first events that occur when exponentially grown cells are transferred from a liquid medium (Luria-Bertani [LB]) to a solid medium (LB agar [LBA]). We observed an initial lag phase of 180 min for the wild type MG1655 without any apparent growth. This lack of growth was independent of the bacterial physiological state (either the stationary or the exponential phase), the solid medium composition, or the number of cells on the plate, but it was dependent on the bacterial genotype. Using lacZ-reporter fusions and two-dimensional electrophoresis analysis, we observed that when cells from exponential-phase cultures were plated on LBA, several global regulons, like heat shock regulons (RpoH, RpoE, CpxAR) and oxidative-stress regulons (SoxRS, OxyR, Fur), were immediately induced. Our results indicate that in order to grow on plates, bacteria must not only adapt to new conditions but also perceive a real stress.

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