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J. Bacteriol., Feb 1996, 1204-1206, Vol 178, No. 4
DD Sledjeski and S Gottesman
The genes (cps) involved in the synthesis of the colanic acid capsular
polysaccharide in Escherichia coli K-12 are transcriptionally regulated by
numerous proteins. Two of these, RcsB and RcsC, share homology with
two-component regulatory elements that respond to environmental stimuli.
Osmotic shock by sucrose or NaCl transiently increased transcription of a
cpsB::lacZ fusion. RcsC and RcsB were essential for osmotic induction of
colanic acid synthesis. In contrast to observations in some other
osmotically regulated systems, addition of glycine betaine enhanced the
osmotic induction of cps::lacZ by both sucrose and NaCl but had no effect
alone.
Copyright © 1996, American Society for Microbiology
Osmotic shock induction of capsule synthesis in Escherichia coli K-12
Laboratory of Molecular Biology, National Cancer Institute, Bethesda, Maryland 20892-4255, USA.
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