{"title":"Functions of the Hha and YdgT proteins in transcriptional silencing by the nucleoid proteins, H-NS and StpA, in Escherichia coli.","authors":"Takeshi Ueda, Hiroki Takahashi, Ebru Uyar, Shu Ishikawa, Naotake Ogasawara, Taku Oshima","doi":"10.1093/dnares/dst008","DOIUrl":null,"url":null,"abstract":"<p><p>The Hha and YdgT proteins are suggested to modulate the expression of horizontally acquired genes by interacting with H-NS and StpA, which play central roles in the transcriptional silencing of such genes. However, it is also possible that Hha/YdgT repress gene expression independently of H-NS/StpA, as we have not fully understood the molecular mechanism through which Hha/YdgT modulate H-NS/StpA activity. To gain further insight into the basic functions of Hha/YdgT, we analysed the impact of hha/ydgT double inactivation on the transcriptome profile of Escherichia coli K-12, and compared the effects with that of hns/stpA double inactivation. In addition, we examined the effects of hha/ydgT inactivation on the chromosomal binding of H-NS, and conversely the effects of hns/stpA inactivation on the chromosomal binding of Hha. Our results demonstrated that the chromosomal binding of Hha requires H-NS/StpA, and is necessary for the repression of a subset of genes in the H-NS/StpA regulon. Furthermore, the distribution of H-NS binding around Hha/YdgT-dependent and -independent genes suggests that Hha/YdgT proteins modulate formation of the H-NS/StpA-DNA complex.</p>","PeriodicalId":11212,"journal":{"name":"DNA Research: An International Journal for Rapid Publication of Reports on Genes and Genomes","volume":" ","pages":"263-71"},"PeriodicalIF":0.0000,"publicationDate":"2013-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1093/dnares/dst008","citationCount":"44","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"DNA Research: An International Journal for Rapid Publication of Reports on Genes and Genomes","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1093/dnares/dst008","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2013/3/29 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 44
Abstract
The Hha and YdgT proteins are suggested to modulate the expression of horizontally acquired genes by interacting with H-NS and StpA, which play central roles in the transcriptional silencing of such genes. However, it is also possible that Hha/YdgT repress gene expression independently of H-NS/StpA, as we have not fully understood the molecular mechanism through which Hha/YdgT modulate H-NS/StpA activity. To gain further insight into the basic functions of Hha/YdgT, we analysed the impact of hha/ydgT double inactivation on the transcriptome profile of Escherichia coli K-12, and compared the effects with that of hns/stpA double inactivation. In addition, we examined the effects of hha/ydgT inactivation on the chromosomal binding of H-NS, and conversely the effects of hns/stpA inactivation on the chromosomal binding of Hha. Our results demonstrated that the chromosomal binding of Hha requires H-NS/StpA, and is necessary for the repression of a subset of genes in the H-NS/StpA regulon. Furthermore, the distribution of H-NS binding around Hha/YdgT-dependent and -independent genes suggests that Hha/YdgT proteins modulate formation of the H-NS/StpA-DNA complex.