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CRISPR-Cas molecular beacons as tool for studies of assembly of CRISPR-Cas effector complexes and their interactions with DNA. | LitMetric
CRISPR-Cas systems protect prokaryotic cells from invading phages and plasmids by recognizing and cleaving foreign nucleic acid sequences specified by CRISPR RNA spacer sequences. Several CRISPR-Cas systems have been widely used as tool for genetic engineering. In DNA-targeting CRISPR-Cas nucleoprotein effector complexes, the CRISPR RNA forms a hybrid with the complementary strand of foreign DNA, displacing the noncomplementary strand to form an R-loop. The DNA interrogation and R-loop formation involve several distinct steps the molecular details of which are not fully understood. This chapter describes a recently developed fluorometric Cas beacon assay that may be used for measuring of specific affinity of various CRISPR-Cas complexes for unlabeled target DNA and model DNA probes. The Cas beacon approach also can provide a sensitive method for monitoring the kinetics of assembly of CRISPR-Cas complexes.
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