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首页> 外文期刊>EMBO Journal >Coordinate gene regulation by fimbriae-induced signal transduction.
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Coordinate gene regulation by fimbriae-induced signal transduction.

机译:协调由fimbriae-induced基因调控信号转导。

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摘要

Fimbriae are thread-like polymers displayed in large amounts on the bacterial surface and used by many pathogens to attach to receptors on host tissue surfaces. Fimbriae contain disulfide bridges, contrary to many Escherichia coli surface proteins produced in bulk amounts. Here we investigate whether fimbriae expression can affect expression of other genes. Analysis of gene expression in two E.coli strains, differing in the fim locus, indicated the flu gene to be affected. The flu gene encodes the antigen 43 (Ag43) surface protein, specifically involved in bacterial aggregation, and microcolony and biofilm formation. Ag43 production is repressed by the global regulator OxyR, which monitors the cell's thiol-disulfide status. Only the thiol form of OxyR represses Ag43 production. We demonstrate that production of several different disulfide-containing fimbriae results in the abolition of Ag43 production. No effect was observed in an oxyR mutant. We conclude that fimbriae expression per se constitutes a signal transduction mechanism that affects a number of unrelated genes via the thiol-disulfide status of OxyR. Thus, phase variation in fimbrial expression is coordinated with the expression of other disease- and colonization-related genes.
机译:菌毛是线型聚合物中显示大量细菌表面和使用很多病菌附着在受体上的主人组织的表面。桥梁,相反许多大肠杆菌表面蛋白生产散装。我们调查是否菌毛的表达影响其他基因的表达。基因表达在两个大肠杆菌菌株不同鱼翅轨迹,表明流感基因受到影响。(Ag43)表面蛋白,特别是参与细菌聚合和小菌落生物膜的形成。全球监管机构OxyR,监视细胞的thiol-disulfide地位。形式的OxyR压制Ag43生产。证明生产几种不同disulfide-containing菌毛的结果废除Ag43生产。观察oxyR突变。菌毛的表达本身构成的信号影响的传导机制通过thiol-disulfide地位无关的基因OxyR。表达式是协调的表达其他疾病,colonization-related基因。

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