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The DUF1013 protein TrcR tracks with RNA polymerase to control bacterial cell cycle and protection against antibiotics

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

ORGANISM(S): Caulobacter vibrioides NA1000 Sinorhizobium meliloti 2011

PROVIDER: GSE148654 | GEO | 2021/02/03

REPOSITORIES: GEO

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The DUF1013 protein TrcR tracks with RNA polymerase to control bacterial cell cycle and protection against antibiotics (RNA-seq dataset)

Project description:The regulatory roles of proteins associating with DNA-dependent RNA polymerase (RNAP) during transcription elongation are poorly characterized in bacteria. A forward genetic selection for Caulobacter crescentus cell cycle mutants revealed the uncharacterized DUF1013 protein (TrcR, transcriptional cell cycle regulator). TrcR associates with promoters and coding sequences (CDSs) and tracks with active RNAP. Loss of TrcR causes a cell division cycle and growth defect and an insufficiency in the essential cell cycle regulator CtrA. TrcR also protects cells from the quinolone antibiotic nalidixic acid that induces a multi-drug efflux pump and from the RNAP inhibitor rifampicin (Rif) that prevents transcription elongation. TrcR interacts biochemically and genetically with RNAP and no longer associates with chromatin when RNAP is inhibited with Rif. We show that these TrcR functions and its RNAP-dependent chromatin recruitment are conserved in symbiotic Sinorhizobium sp. and pathogenic Brucella sp., indicating that TrcR represents a new antibiotic target.

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The DUF1013 protein TrcR tracks with RNA polymerase to control bacterial cell cycle and protection against antibiotics (ChIP-seq dataset)

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The DUF1013 protein TrcR tracks with RNA polymerase to control the bacterial cell cycle and protect against antibiotics.

Project description:How DNA-dependent RNA polymerase (RNAP) acts on bacterial cell cycle progression during transcription elongation is poorly investigated. A forward genetic selection for Caulobacter crescentus cell cycle mutants unearthed the uncharacterized DUF1013 protein (TrcR, transcriptional cell cycle regulator). TrcR promotes the accumulation of the essential cell cycle transcriptional activator CtrA in late S-phase but also affects transcription at a global level to protect cells from the quinolone antibiotic nalidixic acid that induces a multidrug efflux pump and from the RNAP inhibitor rifampicin that blocks transcription elongation. We show that TrcR associates with promoters and coding sequences in vivo in a rifampicin-dependent manner and that it interacts physically and genetically with RNAP. We show that TrcR function and its RNAP-dependent chromatin recruitment are conserved in symbiotic Sinorhizobium sp. and pathogenic Brucella spp Thus, TrcR represents a hitherto unknown antibiotic target and the founding member of the DUF1013 family, an uncharacterized class of transcriptional regulators that track with RNAP during the elongation phase to promote transcription during the cell cycle.

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