Japan Agency for Medical Research and Development (AMED)
Japan
Citation
Journal: Mol Cell / Year: 2022 Title: Structure and engineering of the minimal type VI CRISPR-Cas13bt3. Authors: Ryoya Nakagawa / Soumya Kannan / Han Altae-Tran / Satoru N Takeda / Atsuhiro Tomita / Hisato Hirano / Tsukasa Kusakizako / Tomohiro Nishizawa / Keitaro Yamashita / Feng Zhang / Hiroshi ...Authors: Ryoya Nakagawa / Soumya Kannan / Han Altae-Tran / Satoru N Takeda / Atsuhiro Tomita / Hisato Hirano / Tsukasa Kusakizako / Tomohiro Nishizawa / Keitaro Yamashita / Feng Zhang / Hiroshi Nishimasu / Osamu Nureki / Abstract: Type VI CRISPR-Cas13 effector enzymes catalyze RNA-guided RNA cleavage and have been harnessed for various technologies, such as RNA detection, targeting, and editing. Recent studies identified ...Type VI CRISPR-Cas13 effector enzymes catalyze RNA-guided RNA cleavage and have been harnessed for various technologies, such as RNA detection, targeting, and editing. Recent studies identified Cas13bt3 (also known as Cas13X.1) as a miniature Cas13 enzyme, which can be used for knockdown and editing of target transcripts in mammalian cells. However, the action mechanism of the compact Cas13bt3 remains unknown. Here, we report the structures of the Cas13bt3-guide RNA complex and the Cas13bt3-guide RNA-target RNA complex. The structures revealed how Cas13bt3 recognizes the guide RNA and its target RNA and provided insights into the activation mechanism of Cas13bt3, which is distinct from those of the other Cas13a/d enzymes. Furthermore, we rationally engineered enhanced Cas13bt3 variants and ultracompact RNA base editors. Overall, this study improves our mechanistic understanding of the CRISPR-Cas13 enzymes and paves the way for the development of efficient Cas13-mediated transcriptome modulation technologies.
Method to determine structure: SAD / Resolution: 1.89→48.99 Å / Cor.coef. Fo:Fc: 0.963 / Cor.coef. Fo:Fc free: 0.944 / SU B: 3.688 / SU ML: 0.102 / Cross valid method: THROUGHOUT / σ(F): 0 / ESU R: 0.153 / ESU R Free: 0.147 / Stereochemistry target values: MAXIMUM LIKELIHOOD Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS U VALUES : REFINED INDIVIDUALLY
Rfactor
Num. reflection
% reflection
Selection details
Rfree
0.2429
2287
3 %
RANDOM
Rwork
0.1957
-
-
-
obs
0.1971
73944
99.9 %
-
Solvent computation
Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK
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