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Small CRISPR RNAs guide antiviral defense in prokaryotes
Laboratory of Microbiology, Department of Agrotechnology and Food Sciences, Wageningen University.
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2008 (English)In: Science, ISSN 0036-8075, Vol. 321, no 5891, 960-964 p.Article in journal (Refereed) Published
Abstract [en]

Prokaryotes acquire virus resistance by integrating short fragments of viral nucleic acid into clusters of regularly interspaced short palindromic repeats (CRISPRs). Here we show how virus-derived sequences contained in CRISPRs are used by CRISPR-associated (Cas) proteins from the host to mediate an antiviral response that counteracts infection. After transcription of the CRISPR, a complex of Cas proteins termed Cascade cleaves a CRISPR RNA precursor in each repeat and retains the cleavage products containing the virus-derived sequence. Assisted by the helicase Cas3, these mature CRISPR RNAs then serve as small guide RNAs that enable Cascade to interfere with virus proliferation. Our results demonstrate that the formation of mature guide RNAs by the CRISPR RNA endonuclease subunit of Cascade is a mechanistic requirement for antiviral defense.

Place, publisher, year, edition, pages
2008. Vol. 321, no 5891, 960-964 p.
Keyword [en]
National Category
Natural Sciences
Research subject
Microbiology; Biochemistry; Genetics
URN: urn:nbn:se:uu:diva-144617DOI: 10.1126/science.1159689PubMedID: 18703739OAI: oai:DiVA.org:uu-144617DiVA: diva2:393809
Available from: 2011-02-01 Created: 2011-02-01 Last updated: 2012-03-08Bibliographically approved

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