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Cas12a2 elicits abortive infection through RNA-triggered destruction of dsDNA

ABSTRACT: Cas12a2 elicits abortive infection through RNA-triggered destruction of dsDNA

PROVIDER: PRJNA739569 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14869970_1.fastq.gz	Fastqsanger.gz
	SRR14869970_2.fastq.gz	Fastqsanger.gz
	SRR14869971_1.fastq.gz	Fastqsanger.gz
	SRR14869971_2.fastq.gz	Fastqsanger.gz
	SRR14869972_1.fastq.gz	Fastqsanger.gz

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Cas12a2 elicits abortive infection through RNA-triggered destruction of dsDNA.

Project description:Bacterial abortive-infection systems limit the spread of foreign invaders by shutting down or killing infected cells before the invaders can replicate1,2. Several RNA-targeting CRISPR-Cas systems (that is, types III and VI) cause abortive-infection phenotypes by activating indiscriminate nucleases3-5. However, a CRISPR-mediated abortive mechanism that leverages indiscriminate DNase activity of an RNA-guided single-effector nuclease has yet to be observed. Here we report that RNA targeting by the type V single-effector nuclease Cas12a2 drives abortive infection through non-specific cleavage of double-stranded DNA (dsDNA). After recognizing an RNA target with an activating protospacer-flanking sequence, Cas12a2 efficiently degrades single-stranded RNA (ssRNA), single-stranded DNA (ssDNA) and dsDNA. Within cells, the activation of Cas12a2 induces an SOS DNA-damage response and impairs growth, preventing the dissemination of the invader. Finally, we harnessed the collateral activity of Cas12a2 for direct RNA detection, demonstrating that Cas12a2 can be repurposed as an RNA-guided RNA-targeting tool. These findings expand the known defensive abilities of CRISPR-Cas systems and create additional opportunities for CRISPR technologies.

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Cas12a2 elicits abortive infection through RNA-triggered destruction of dsDNA

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Project description:To analyze abortive transcription rate close to TSS, we developed a new method called Flux-seq

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unclassified dsDNA viruses

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Expression data from dsDNA-stimulated mouse embryonic fibroblasts

Project description:Transfection of dsDNA into many mammalian cell types indues the production of type I interferons and interferon-stimulated genes. We performed an siRNA screen to identify genes involved in this innate immune response, and identified Abcf1. We used microarrays to determine which genes are regulated by ABCF1 following dsDNA stimulation. We treated p53-/- mouse embryonic fibroblasts (MEFs) with siRNAs targeting Abcf1 or Irf3 (positive control) or a negative control siRNA (siCtrl), and then stimulated the cells with 45-base pair dsDNA for 6 hrs or left the cells unstimulated. We then lysed the cells and hybridized the RNA to Affymetrix microarrays.

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Counting abortive transcription by Flux-seq

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For origin melting Rep nucleoprotein complex accommodates both dsDNA and ssDNA of DUE

Project description:The replication initiation proteins interact dsDNA located at replication origin and ssDNA of DNA unwinding element (DUE), formed as a result of the destabilization of the double-stranded helix of AT-rich origin region. It is a critical step in the DNA replication initiation; however, the structure of nucleoprotein complex involving initiator protein, dsDNA and/or ssDNA is still elusive and different models are proposed. In this work, based on crosslinking combined with mass spectrometry (MS), structural and bioinformatic analysis, we defined amino acid residues in plasmid Rep proteins, TrfA and RepE, that are essential for interaction with ssDNA. The study of Rep mutant proteins containing single amino acid substitutions affecting DNA interaction reveals the importance of Rep-ssDNA complexes formation for a dsDNA melting at DUE. Furthermore, the crystal structures obtained for complex of RepE protein with DUE ssDNA, and, RepE complexed with both DUE ssDNA and dsDNA containing RepE specific binding site (iteron) revealed that the plasmid initiator can not only bind iterons and ssDNA DUE separately but also can form a tripartite nucleoprotein complex bringing together specific sequences of replication origin. The presented data strongly supports the loop-back model in which a replication initiator molecule interacts with dsDNA and ssDNA.

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