It is shown that short RNAs can directly occupy the canonical crRNA-binding channel and trigger a catalytically competent trans cleavage state in the absence of PAM recognition or canonical R-loop formation.
The mechanisms of nuclease activation are explored by solving seven ternary cryo-electron mi-croscopy structures of wild-type Cas13d in complex with matched and mismatched targets and an active site loop in the HEPN domains that regulates substrate accessibility is identified.
Chia-Wei Chou, Selma Sinan, Hung-Che Kuo et al.· bioRxiv· 0 citations
CRISPR-Cas systems are RNA-guided nucleases that enable prokaryotic immunity; however, some loci encode additional associated genes that cooperate with CRISPR effectors to perform diverse biological functions. Here, we uncover a CRISPR-associated kinase (CASK) system that links the recognition of target RNA to protein...
Yang Liu, Yan Qin, Imane Bouzit et al.· bioRxiv· 0 citations
Abstract Selective and tunable regulation of clustered regularly interspaced short palindromic repeats (CRISPR)/Cas12a activity enables on-demand control, yet current strategies remain hindered by nonspecific regulation and limited tunability. Inspired by proximity effect, we present a Cas-regulation-targeting chimera...
RAPID (RNA/DNA Advanced chimeric, PAM-independent, Integrated Nicking, Diagnostics), a nick-tuned, PAM-duplex-mediated platform for PAM-independent RNA and DNA detection and applies it to detect single-point mutations in ssDNA and RNA substrates, a challenge for traditional Cas12 and Cas13 systems.
I. Iwe, Frank X. Liu, A. Corsano et al.· Nucleic Acids Research· 0 citations
This study isolates the I-A Cascade from Saccharolobus islandicus, revealing a minimal form of Cascade lacking both Cas3 and the CRISPR-RNA maturase Cas6, and shows that ATP not only enables the processive target degradation by Cas3 but also suppresses the trans-cleavage of the same enzyme.
Su-Ping Jiang, Xuhui Tian, Fang Wang et al.· Cell Reports· 1 citation
A rapid isothermal strategy for miRNA detection based on ligation-dependent generation of Cas13a-activating RNA and CRISPR/Cas13a-mediated signal amplification that provides a useful framework for miRNA detection.
Jiyoon Lee, Jihyun Kim, Ye-On-Jo Dong et al.· ACS Omega· 0 citations
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