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J. Bacteriol., 01 1998, 201-209, Vol 180, No. 2
S Srinivasan, J Ostling, T Charlton, R de Nys, K Takayama and S Kjelleberg
The role of exogenous metabolites as putative signal molecules mediating
and/or regulating the carbon starvation adaptation program in Vibrio sp.
strain S14 was investigated. Addition of the stationary- phase supernatant
extract (SSE) of Vibrio sp. strain S14 to logarithmic- phase cells resulted
in a significant number of carbon starvation- induced proteins being
up-regulated. Halogenated furanones, putative antagonists of acylated
homoserine lactones (AHLs), inhibited the synthesis of proteins
specifically induced upon carbon starvation. The effect of the furanone was
the opposite of that caused by SSE with respect to the up- and
down-regulation of protein expression, indicating that both the furanone
and the putative signalling molecules were acting on the same regulatory
pathway. Culturability was rapidly lost when Vibrio sp. strain S14 was
starved in the presence of the furanone at a low concentration. The
furanone also had a negative effect on the ability of carbon-starved cells
to mount resistance against UV irradiation and hydrogen peroxide exposure.
The SSE of Vibrio sp. strain S14 had the ability to provide
cross-protection against the loss in viability caused by the furanone. We
have further demonstrated that the SSE taken from low- as well as
high-cell-density cultures of Vibrio sp. strain S14 induced luminescence in
Vibrio harveyi. Taken together, the results in this report provide evidence
that Vibrio sp. strain S14 produces extracellular signalling metabolites
during carbon and energy starvation and that these molecules play an
important role in the expression of proteins crucial to the development of
starvation- and stress-resistant phenotypes.
Copyright © 1998, American Society for Microbiology
Extracellular signal molecule(s) involved in the carbon starvation response of marine Vibrio sp. strain S14 [In Process Citation]
School of Microbiology and Immunology, University of New South Wales, Sydney, Australia.
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