Unknown,Transcriptomics,Genomics,Proteomics

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Sequestration of a two-component response regulator by a riboswitch regulated non-coding RNA

ABSTRACT: Riboswitches are ligand-binding elements contained within the 5M-bM-^@M-^Y untranslated regions of bacterial transcripts, which generally regulate expression of downstream open reading frames. Here we show that in Listeria monocytogenes, a Vitamin B12-binding (B12) riboswitch controls expression of a non-coding regulatory RNA, Rli55. Rli55 in turn controls expression of the eut genes, which enable ethanolamine utilization and require B12 as a cofactor. Defects in ethanolamine utilization, or in its regulation by Rli55, significantly attenuate Listeria virulence in mice. Rli55 functions by sequestering the two-component response regulator, EutV via a EutV binding-site contained within the RNA. Thus Rli55 is a riboswitch-regulated member of the small group of regulatory RNAs that function by sequestering a protein and reveals a unique mechanism of signal integration in bacterial gene regulation. RNA-Seq and CLIP-Seq to investigate the sequestration of EutV by rli55

ORGANISM(S): Listeria monocytogenes EGD-e

SUBMITTER: Jeffrey Mellin

PROVIDER: E-GEOD-60363 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The foodborne pathogen Listeria monocytogenes has the ability to develop biofilm in food-processing environment, which becomes a major concern for the food safety. PrfA, a key transcriptional activator that regulates most of the known listerial virulence gene expression, has been shown to promote L. monocytogenes biofilm formation. In this study, the whole genome microarray was used to identify differentially expressed genes associated with the putative interaction between biofilm formation and PrfA in L. monocytogenes. Comparative transcriptome analyses indicated over 21.9% of the L. monocytogenes EGDe genes (627 out of 2857 predicted) were altered in their expression in biofilm cells relative to planktonic cell populations. These genes were classed into different functional categories which cover most of the biochemical functions encountered in bacterial cells, especially involved in ion transport, DNA repair, and cell wall biosynthesis based on significant enrichment of GO terms. Among them, 185 genes were identified to be associated with PrfA and biofilm formation by comparison of the whole gene expression profiles of L. monocytogenes EGDe and its M-NM-^TprfA mutant. The expression tendency of these PrfA-associated and biofilm-specific genes were mainly opposite in M-NM-^TprfA biofilm, and most of them are involved in phage-related function, membrane bioenergetics, and cell wall. Our results indicated that L. monocytogenes biofilm formation is probably controlled by the complex regulation network involved variable genes required for the different biological pathways. This regulatory network is modified in the prfA deletion mutant in order to maintain its stable biofilm lifestyle. Gene expression of planktonic cells and biofilm cells in Listeria monocytogenes EGDe and prfA isogenic deletion strain EGDeM-NM-^TprfA with cultivated in MEM and BHI for 48 hours, were mesasued using Agilent Listeria monocytogenes customized whole-genome microarray 8x15 array. Three replicates.

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Sequestration of a two-component response regulator by a riboswitch regulated non-coding RNA

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