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Rapid cell-free characterization of multi-subunit CRISPR effectors and transposons


ABSTRACT: We report the PAMs of diverse type I-E CRISPR- Cas systems and the type I-C and the type I-F1 CRISPR-Cas systems from Xanthomonas albilineans. Furthermore, we report PAMs of two type I-B CRISPR transposons (CASTs) and the Vibrio cholerae type I-F CAST. For identification of the PAMs, we used a cell-free TXTL-based PAM screen we named PAM-DETECT. By adding a 5N randomized PAM library and plasmids encoding for Cascade genes and gRNAs, recognized PAMs were bound by Cascade and protected from cleavage by a restriction enzyme that has it's recognition site within the target region. By amplifying the non-cleaved target plasmid, we used next-generation sequencing to analyze the enrichment of functional PAMs of the studied CRISPR-Cas systems. We additionally assessed the insertion sites of crRNA-dependent and crRNA-independent transposition of the Rippkaea orientalis type I-B CAST in TXTL and E. coli.

ORGANISM(S): synthetic construct Escherichia coli

PROVIDER: GSE179614 | GEO | 2022/02/24

REPOSITORIES: GEO

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