Common and divergent features in transcriptional control of the homologous small RNAs GlmY and GlmZ in Enterobacteriaceae.
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Authors
Göpel, YvonneLüttmann, Denise
Heroven, Ann Kathrin
Reichenbach, Birte
Dersch, Petra
Görke, Boris
Issue Date
2011-03
Metadata
Show full item recordAbstract
Small RNAs GlmY and GlmZ compose a cascade that feedback-regulates synthesis of enzyme GlmS in Enterobacteriaceae. Here, we analyzed the transcriptional regulation of glmY/glmZ from Yersinia pseudotuberculosis, Salmonella typhimurium and Escherichia coli, as representatives for other enterobacterial species, which exhibit similar promoter architectures. The GlmY and GlmZ sRNAs of Y. pseudotuberculosis are transcribed from σ(54)-promoters that require activation by the response regulator GlrR through binding to three conserved sites located upstream of the promoters. This also applies to glmY/glmZ of S. typhimurium and glmY of E. coli, but as a difference additional σ(70)-promoters overlap the σ(54)-promoters and initiate transcription at the same site. In contrast, E. coli glmZ is transcribed from a single σ(70)-promoter. Thus, transcription of glmY and glmZ is controlled by σ(54) and the two-component system GlrR/GlrK (QseF/QseE) in Y. pseudotuberculosis and presumably in many other Enterobacteria. However, in a subset of species such as E. coli this relationship is partially lost in favor of σ(70)-dependent transcription. In addition, we show that activity of the σ(54)-promoter of E. coli glmY requires binding of the integration host factor to sites upstream of the promoter. Finally, evidence is provided that phosphorylation of GlrR increases its activity and thereby sRNA expression.Citation
Common and divergent features in transcriptional control of the homologous small RNAs GlmY and GlmZ in Enterobacteriaceae. 2011, 39 (4):1294-309 Nucleic Acids Res.Affiliation
Department of General Microbiology, Institute of Microbiology and Genetics, Georg-August-University, Grisebachstrasse 8, 37077 Göttingen, Germany.Journal
Nucleic acids researchPubMed ID
20965974Type
ArticleLanguage
enISSN
1362-4962ae974a485f413a2113503eed53cd6c53
10.1093/nar/gkq986
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