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CRISPR RNA maturation by trans-encoded small RNA and host factor RNase III
Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
Umeå University, Faculty of Medicine, Umeå Centre for Microbial Research (UCMR). Umeå University, Faculty of Medicine, Molecular Infection Medicine Sweden (MIMS). Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
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2011 (English)In: Nature, Vol. 471, no 7340, 602-607 p.Article in journal (Refereed) Published
Abstract [en]

CRISPR/Cas systems constitute a widespread class of immunity systems that protect bacteria and archaea against phages and plasmids, and commonly use repeat/spacer-derived short crRNAs to silence foreign nucleic acids in a sequence-specific manner. Although the maturation of crRNAs represents a key event in CRISPR activation, the responsible endoribonucleases (CasE, Cas6, Csy4) are missing in many CRISPR/Cas subtypes. Here, differential RNA sequencing of the human pathogen Streptococcus pyogenes uncovered tracrRNA, a trans-encoded small RNA with 24-nucleotide complementarity to the repeat regions of crRNA precursor transcripts. We show that tracrRNA directs the maturation of crRNAs by the activities of the widely conserved endogenous RNase III and the CRISPR-associated Csn1 protein; all these components are essential to protect S. pyogenes against prophage-derived DNA. Our study reveals a novel pathway of small guide RNA maturation and the first example of a host factor (RNase III) required for bacterial RNA-mediated immunity against invaders.

Place, publisher, year, edition, pages
2011. Vol. 471, no 7340, 602-607 p.
Identifiers
URN: urn:nbn:se:umu:diva-43208DOI: 10.1038/nature09886OAI: oai:DiVA.org:umu-43208DiVA: diva2:412376
Available from: 2011-04-22 Created: 2011-04-22 Last updated: 2011-07-06Bibliographically approved

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Publisher's full texthttp://www.ncbi.nlm.nih.gov/pubmed/21455174

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Charpentier, Emmanuelle

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Deltcheva, ElitzaChylinski, KrzysztofCharpentier, Emmanuelle
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Umeå Centre for Microbial Research (UCMR)Molecular Infection Medicine Sweden (MIMS)Department of Molecular Biology (Faculty of Medicine)

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CiteExportLink to record
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