Biogenesis pathways of RNA guides in archaeal and bacterial CRISPR-Cas adaptive immunity
Journal Title: | FEMS microbiology reviews 2015, Vol.39 (3), p.428-441 |
Main Author: | Charpentier, Emmanuelle |
Other Authors: | Richter, Hagen , Oost, van der, John , White, Malcolm F |
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English |
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Quelle: | Alma/SFX Local Collection |
Publisher: | England: Oxford University Press |
ID: | ISSN: 0168-6445 |
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recordid: | cdi_wageningen_narcis_oai_library_wur_nl_wurpubs_495874 |
title: | Biogenesis pathways of RNA guides in archaeal and bacterial CRISPR-Cas adaptive immunity |
format: | Article |
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ispartof: | FEMS microbiology reviews, 2015, Vol.39 (3), p.428-441 |
description: | CRISPR-Cas is an RNA-mediated adaptive immune system that defends bacteria and archaea against mobile genetic elements. Short mature CRISPR RNAs (crRNAs) are key elements in the interference step of the immune pathway. A CRISPR array composed of a series of repeats interspaced by spacer sequences acquired from invading mobile genomes is transcribed as a precursor crRNA (pre-crRNA) molecule. This pre-crRNA undergoes one or two maturation steps to generate the mature crRNAs that guide CRISPR-associated (Cas) protein(s) to cognate invading genomes for their destruction. Different types of CRISPR-Cas systems have evolved distinct crRNA biogenesis pathways that implicate highly sophisticated processing mechanisms. In Types I and III CRISPR-Cas systems, a specific endoribonuclease of the Cas6 family, either standalone or in a complex with other Cas proteins, cleaves the pre-crRNA within the repeat regions. In Type II systems, the trans-acting small RNA (tracrRNA) base pairs with each repeat of the pre-crRNA to form a dual-RNA that is cleaved by the housekeeping RNase III in the presence of the protein Cas9. In this review, we present a detailed comparative analysis of pre-crRNA recognition and cleavage mechanisms involved in the biogenesis of guide crRNAs in the three CRISPR-Cas types. |
language: | eng |
source: | Alma/SFX Local Collection |
identifier: | ISSN: 0168-6445 |
fulltext: | fulltext |
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