A global role for Fis in the transcriptional control of metabolism and type III secretion in Salmonella enterica serovar Typhimurium

被引:159
作者
Kelly, A
Goldberg, MD
Carroll, RK
Danino, V
Hinton, JCD
Dorman, CJ [1 ]
机构
[1] Univ Dublin Trinity Coll, Dept Microbiol, Moyne Inst Prevent Med, Dublin 2, Ireland
[2] Food Res Inst, Mol Microbiol Grp, Norwich NR4 7UA, Norfolk, England
来源
MICROBIOLOGY-SGM | 2004年 / 150卷
关键词
D O I
10.1099/mic.0.27209-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Fis is a key DNA-binding protein involved in nucleoid organization and modulation of many DNA transactions, including transcription in enteric bacteria. The regulon of genes whose expression is influenced by Fis in Salmonella enterica serovar Typhimurium (S. typhimurium) has been defined by DNA microarray analysis. These data suggest that Fis plays a central role in coordinating the expression of both metabolic and type III secretion factors. The genes that were most strongly up-regulated by Fis were those involved in virulence and located in the pathogenicity islands SPI-1, SPI-2, SPI-3 and SPI-5. Similarly, motility and flagellar genes required Fis for full expression. This was shown to be a direct effect as purified Fis protein bound to the promoter regions of representative flagella and SPI-2 genes. Genes contributing to aspects of metabolism known to assist the bacterium during survival in the mammalian gut were also Fis-regulated, usually negatively. This category included components of metabolic pathways for propanediol utilization, biotin synthesis, vitamin B-12 transport, fatty acids and acetate metabolism, as well as genes for the glyoxylate bypass of the tricarboxylic acid cycle. Genes found to be positively regulated by Fis included those for ethanolamine utilization. The data reported reveal the central role played by Fis in coordinating the expression of both housekeeping and virulence factors required by S. typhimurium during life in the gut lumen or during systemic infection of host cells.
引用
收藏
页码:2037 / 2053
页数:17
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