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Ralstonia pseudosolanacearum GMI1000

ABSTRACT: Regulation of bacterial physiology and virulence by the second messenger 2',3'-cyclic guanosine monophosphate

PROVIDER: PRJNA990578 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR25119062_1.fastq.gz	Fastqsanger.gz
	SRR25119062_2.fastq.gz	Fastqsanger.gz
	SRR25119063_1.fastq.gz	Fastqsanger.gz
	SRR25119063_2.fastq.gz	Fastqsanger.gz
	SRR25119064_1.fastq.gz	Fastqsanger.gz

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A Phosphotriester-Masked Dideoxy-cGAMP Derivative as a Cell-Permeable STING Agonist

Project description:2’3’-cyclic GMP-AMP (cGAMP) is a cyclic dinucleotide second messenger in which guanosine and adenosine are connected by one 3’-5’ and one 2’-5’ phosphodiester linkage. It is formed in the cytosol upon detection of pathogenic DNA by the enzyme guanosine-monophosphate-adenosine monophosphate synthase (cGAS). cGAMP subsequently binds to the adaptor protein stimulator of interferon genes (STING) to elicit an innate immune response leading to the production of type I interferons and cytokines. STING agonists are a highly promising avenue for an immuno-oncological anticancer therapy. A particular challenge with cyclic dinucleotide STING agonists are the two negative charges of the phosphodiester linkages, which strongly reduce the ability of such compounds to penetrate cell membranes. The development of cell-permeable STING agonists that can stimulate the immune system to enhance their anticancer potency is currently of utmost importance in the field. Here, we report the development of a dideoxy derivative of cGAMP as a phosphotriester prodrug, where the negative charge of the phosphate backbone has been masked with a thioester. We found that this thioester-protected compound features a dramatic increase in its cellular potency that rises from EC50 = 5 µM to 25 nM. The new compound is envisioned to enable an efficient STING-agonist-based anticancer therapy.

2025-05-07 | PXD057395 | Pride

RNASeq of human bronchial epithelial (HBE) cells with cGAS-siRNA transfected

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A host type I interferon response is induced by cytosolic sensing of the bacterial second messenger cyclic-di-GMP

Project description:The innate immune system responds to unique molecular signatures that are widely conserved among microbes but that are not normally present in host cells. Compounds that stimulate innate immune pathways may be valuable in the design of novel adjuvants, vaccines, and other immunotherapeutics.The cyclic dinucleotide cyclic-di-guanosine monophosphate (c-di-GMP) is a recently appreciated second messenger that plays critical regulatory roles in many species of bacteria but is not produced by eukaryotic cells. In vivo and in vitro studies have previously suggested that c-di-GMP is a potent immunostimulatory compound recognized by mouse and human cells. Here we provide evidence that c-di-GMP is sensed in the cytosol of mammalian cells via a novel immunosurveillance pathway. The potency of cytosolic signaling induced by cyclic-di- GMP is comparable to that induced by cytosolic delivery of DNA, and both nucleic acids induce a similar transcriptional profile, including triggering of type I interferons and coregulated genes via induction of TBK1, IRF3, NF-!B and MAP kinases. However, the cytosolic pathway that senses c-di-GMP appears to be distinct from all known nucleic acid-sensing pathways.Our results suggest a novel mechanism by which host cells can induce an inflammatory response to a widely produced bacterial ligand. Three-condition experiment: macrophages transfected with mono-GMP (negative control), double-stranded DNA (positive control), or cyclic-di-GMP (experimental condition). Biological replicates: two, independently treated, harvested, and hybridized to arrays. One replicate per array, except two technical replicates were performed for one of the positive control samples.

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