Osmotic shock induction of capsule synthesis in Escherichia coli K-12

被引:147
作者
Sledjeski, DD [1 ]
Gottesman, S [1 ]
机构
[1] NCI,MOLEC BIOL LAB,BETHESDA,MD 20892
关键词
D O I
10.1128/jb.178.4.1204-1206.1996
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
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.
引用
收藏
页码:1204 / 1206
页数:3
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