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- W2912254658 abstract "CRISPR-Cas systems as adaptive immunity in bacteria and archaea battle against bacteriophages. However, little is known how CRISPR-Cas systems are precisely regulated to effectively eliminate intruders while not inducing self-reactivity. Here, we identify intrinsic negative modulator of CRISPR-Cas that influences interference and adaptation functions. LasI/RhlI-derived autoinducers activate cas operon by enhancing the binding of virulence factor regulator (Vfr) cis-response elements to cas1 promoter, whereas CdpR represses this intracellular signaling and blocks transcription of cas operon. Importantly, inhibition of Vfr reduces cas1 expression and impairs immunization and immune memory mediated by CRISPR-Cas, leading to more severe phage infection but lower self-targeting activities. In addition, CdpR-mediated LasI/RhlI/Vfr intracellular signaling represses cleavage of bacterial endogenous sequences by impeding Cas3 RNA cleavage activity. Thus, CdpR renders important inhibitory effects on CRISPR-Cas systems to avoid possible self-reactivity but potentially heightening infection risk. Our study provides insight into fine regulation of CRISPR-Cas systems for maintaining homeostasis." @default.
- W2912254658 created "2019-02-21" @default.
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- W2912254658 date "2019-03-01" @default.
- W2912254658 modified "2023-10-16" @default.
- W2912254658 title "CdpR Inhibits CRISPR-Cas Adaptive Immunity to Lower Anti-viral Defense while Avoiding Self-Reactivity" @default.
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- W2912254658 doi "https://doi.org/10.1016/j.isci.2019.02.005" @default.
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