Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 447871
Title crRNA biogenesis
Author(s) Charpentier, E.; Oost, J. van der; White, M.
Source In: CRISPR-Cas Systems / Barrangou, R., Oost, J. van der, Berlin-Heidelberg : Springer Verlag - ISBN 9783642346569 - p. 115 - 144.
Department(s) Microbiological Laboratory
Publication type Peer reviewed book chapter
Publication year 2013
Abstract Mature crRNAs are key elements in CRISPR-Cas defense against genome invaders. These short RNAs are composed of unique repeat/spacer sequences that guide the Cas protein(s) to the cognate invading nucleic acids for their destruction. The biogenesis of mature crRNAs involves highly precise processing events. Interestingly, different types of CRISPR-Cas systems have evolved distinct crRNA maturation mechanisms. The CRISPR repeat-spacer array is transcribed as a precursor CRISPR RNA molecule (pre-crRNA) that undergoes one or two maturation steps. In type I CRISPR-Cas systems, pre-crRNA is cleaved within the repeat regions by a specific Cas6-like endoribonuclease that at least in some cases is a subunit of a Cascade complex to yield the mature crRNAs. In type III systems, the standalone endoribonuclease Cas6 processes pre-crRNA by cleavage within the repeats, producing an intermediate molecule that is further trimmed to generate the mature crRNAs. Type II systems have evolved a unique crRNA biogenesis pathway, in which a trans-acting small RNA (encoded by the CRISPR-Cas locus) base pairs with each repeat sequence of the pre-crRNA to form a double-stranded RNA template that is cleaved by the housekeeping endoribonuclease III in the presence of protein Cas9 (Csn1). The generated intermediates are then subjected to further maturation by a yet to be revealed mechanism. In this chapter, we present a detailed comparative analysis of pre-crRNA recognition and cleavage mechanisms involved in crRNA biogenesis in the three types of CRISPR-Cas systems
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