Analysis of CRISPR pre-crRNA cleavage

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Abstract

We have examined the processing of precursor-clustered regularly interspaced short palindromic repeat (CRISPR) RNAs (pre-crRNAs) of the Type I CRISPR-Cas system by incubation of radiolabeled model RNAs with recombinant CRISPR-associated (Cas) endoribonucleases, followed by denaturing polyacrylamide gel electrophoresis (PAGE) of the products. Determination of cleavage position is based on comparison with RNase T1 digestion and base hydrolysis products. The mechanism of cleavage is investigated by chemical and enzymatic characterization of the reaction products as well as by the demonstration that a specific 2′-deoxy substitution 5′ to the scissile phosphate blocks endonucleolytic cleavage.

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Garside, E. L., & MacMillan, A. M. (2015). Analysis of CRISPR pre-crRNA cleavage. Methods in Molecular Biology, 1311, 35–46. https://doi.org/10.1007/978-1-4939-2687-9_3

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