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FabR regulates Salmonella biofilm formation via its direct target FabB

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Salmonella enterica subsp. enterica Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344 Salmonella enterica subsp. enterica serovar Typhimurium str. LT2

PROVIDER: GSE52881 | GEO | 2014/12/31

SECONDARY ACCESSION(S): PRJNA230387

REPOSITORIES: GEO

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FabR regulates Salmonella biofilm formation via its direct target FabB.

Project description:BackgroundBiofilm formation is an important survival strategy of Salmonella in all environments. By mutant screening, we showed a knock-out mutant of fabR, encoding a repressor of unsaturated fatty acid biosynthesis (UFA), to have impaired biofilm formation. In order to unravel how this regulator impinges on Salmonella biofilm formation, we aimed at elucidating the S. Typhimurium FabR regulon. Hereto, we applied a combinatorial high-throughput approach, combining ChIP-chip with transcriptomics.ResultsAll the previously identified E. coli FabR transcriptional target genes (fabA, fabB and yqfA) were shown to be direct S. Typhimurium FabR targets as well. As we found a fabB overexpressing strain to partly mimic the biofilm defect of the fabR mutant, the effect of FabR on biofilms can be attributed at least partly to FabB, which plays a key role in UFA biosynthesis. Additionally, ChIP-chip identified a number of novel direct FabR targets (the intergenic regions between hpaR/hpaG and ddg/ydfZ) and yet putative direct targets (i.a. genes involved in tRNA metabolism, ribosome synthesis and translation). Next to UFA biosynthesis, a number of these direct targets and other indirect targets identified by transcriptomics (e.g. ribosomal genes, ompA, ompC, ompX, osmB, osmC, sseI), could possibly contribute to the effect of FabR on biofilm formation.ConclusionOverall, our results point at the importance of FabR and UFA biosynthesis in Salmonella biofilm formation and their role as potential targets for biofilm inhibitory strategies.

| S-EPMC4804515 | biostudies-literature

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