Transcriptomics

Dataset Information

61

A New Class of Homoserine Lactone Quorum Sensing Signals


ABSTRACT: Quorum sensing is a term used to describe cell-to-cell communication that allows cell density-dependent gene expression. Many Gram-negative bacteria use acyl-homoserine lactone (acyl-HSL) synthases to generate fatty acyl-HSL quorum sensing signals, which function with signal receptors to control expression of specific genes. The fatty acyl group is derived from fatty acid biosynthesis and provides signal specificity, but the variety of signals is limited. We have discovered that the photosynthetic bacterium Rhodopseudomonas palustris uses an acyl-HSL synthase to produce p-coumaroyl-HSL by using environmental p-coumaric acid rather than fatty acids from cellular pools. The bacterium has a signal receptor with homology to fatty acyl-HSL receptors that responds to p-coumaroyl-HSL to regulate global gene expression. We also found that p-coumaroyl-HSL is made by other bacteria including Bradyrhizobium BTAi1 and Silicibacter pomeroyi DSS-3. This discovery extends the range of possibilities for acyl-HSL quorum sensing and raises fundamental questions about quorum sensing within the context of environmental signaling. Keywords: Comparison of transcriptome profiles Transcriptome profiles between Rhodopseudomonas palustris cells grown in the in the presence or absence of pC-HSL were compared.

ORGANISM(S): Rhodopseudomonas palustris CGA009  

SUBMITTER: Caroline S Harwood   Katarina Juhaszova  Jean J Huang  Amy L Schaefer  Silke Schmidt  Gili Bittan-Banin  Everett P Greenberg  Janice R Sufrin  Colin M Oliver  Caroline M Peres  Yasuhiro Oda 

PROVIDER: E-GEOD-10642 | ArrayExpress | 2010-05-25

SECONDARY ACCESSION(S): GSE10642PRJNA107717

REPOSITORIES: GEO, ArrayExpress

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Quorum sensing is a term used to describe cell-to-cell communication that allows cell-density-dependent gene expression. Many bacteria use acyl-homoserine lactone (acyl-HSL) synthases to generate fatty acyl-HSL quorum-sensing signals, which function with signal receptors to control expression of specific genes. The fatty acyl group is derived from fatty acid biosynthesis and provides signal specificity, but the variety of signals is limited. Here we show that the photosynthetic bacterium Rhodops  ...[more]

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