Cas6 Endonuclease
Cas6 Endonuclease - Related Videos
11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
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Cited by 4 •
2012
CRISPR/Cas systems mediate adaptive immunity in Bacteria and Archaea. Many Cas proteins are proposed to act as endoribonucleases acting on crRNA precursors of varying length. Here we illustrate three different approaches to generate pre-crRNA substrates for the biochemical analysis of Cas endonuclease activity.
09:40
Quantitation and Analysis of the Formation of HO-Endonuclease Stimulated Chromosomal Translocations by Single-Strand Annealing in Saccharomyces cerevisiae
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Cited by 9 •
2011
The HO-stimulated translocation assay monitors single-strand annealing following the creation of DNA double-strand breaks at multiple loci in diploid Saccharomyces cerevisiae. This mechanism may model genome rearrangements in somatic cells of higher eukaryotes following exposure to high doses of ionizing radiation.
09:16
In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
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2020
Restriction endonucleases with new sequence specificity can be developed from enzymes recognizing a partially degenerate sequence. Here we provide a detailed protocol that we successfully used to alter the sequence specificity of NlaIV enzyme. Key ingredients of the protocol are the in vitro compartmentalization of the transcription/translation reaction and selection of variants with new sequence specificities.
10:59
Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Cited by 3 •
2021
This article introduces essential steps of immunostaining and chromatin immunoprecipitation. These protocols are commonly used to study DNA damage-related cellular processes and to visualize and quantify the recruitment of proteins implicated in DNA repair.
09:53
Single-Molecule Dwell-Time Analysis of Restriction Endonuclease-Mediated DNA Cleavage
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Cited by 2 •
2021
Using quantum-dot-labeled DNA and total internal reflection fluorescence microscopy, we can investigate the reaction mechanism of restriction endonucleases while using unlabeled protein. This single-molecule technique allows for massively multiplexed observation of individual protein-DNA interactions, and data can be pooled to generate well-populated dwell-time distributions.
FAQs
Cas6 endonuclease identifies precursor CRISPR RNA by recognizing structural features within its repeat regions. That recognition positions the transcript for cleavage at defined sites. The arrangement links repeat architecture to production of mature guide RNAs and shows how RNA structure helps direct the processing step that prepares guides for CRISPR defense.
When Cas6 remains associated with a guide after cleavage, RNA maturation stays physically connected to guide function. The released mature CRISPR RNA can then be present within a CRISPR effector complex, where it supports identification of complementary foreign nucleic acids. This association is relevant to understanding how processing and target recognition can occur as connected stages of adaptive immunity.
Defined cleavage sites determine where precursor transcripts are divided to release mature CRISPR RNAs. Their importance lies in converting a longer transcript into guide units that can support effector-complex targeting. By linking cleavage to repeat architecture, Cas6 processing provides the discrete guide molecules needed to recognize complementary foreign nucleic acids during adaptive defense.
A conceptual analysis starts with a precursor CRISPR transcript and its repeat sequences. It then asks whether Cas6 recognizes the repeat structure, where cleavage occurs, whether mature CRISPR RNAs are released, and whether the enzyme remains associated with a guide. Tracking these stages connects the processing event to subsequent effector-complex recognition of foreign nucleic acids.
Cas6 is especially informative when the goal is to understand how bacteria and archaea regulate RNA-guided defense. Examining its activity connects repeat recognition and transcript cleavage with production of guides used against complementary foreign nucleic acids. This places the enzyme within adaptive immunity rather than treating RNA processing as an isolated biochemical event.
Cas6 research can inform engineered CRISPR systems by showing how a natural enzyme converts precursor transcripts into functional guide RNAs. The same principle also supports investigation of programmable RNA-processing tools. Its value is therefore both explanatory and practical: researchers can study native guide maturation while considering how RNA processing might be incorporated into designed CRISPR architectures.