8J3R image
Entry Detail
PDB ID:
8J3R
EMDB ID:
Title:
Cryo-EM structure of the AsCas12f-HKRA-sgRNAS3-5v7-target DNA
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2023-04-18
Release Date:
2023-09-27
Method Details:
Experimental Method:
Resolution:
2.95 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Transposase IS605 OrfB C-terminal domain-containing protein
Mutations:I123H, D195K, D208R, V232A
Chain IDs:A, E (auth: B)
Chain Length:432
Number of Molecules:2
Biological Source:Sulfoacidibacillus thermotolerans
Polymer Type:polyribonucleotide
Description:RNA (118-MER)
Chain IDs:D (auth: C)
Chain Length:118
Number of Molecules:1
Biological Source:Sulfoacidibacillus thermotolerans
Polymer Type:polydeoxyribonucleotide
Description:DNA (37-MER)
Chain IDs:B (auth: D)
Chain Length:37
Number of Molecules:1
Biological Source:Sulfoacidibacillus thermotolerans
Polymer Type:polydeoxyribonucleotide
Description:DNA (38-MER)
Chain IDs:C (auth: E)
Chain Length:38
Number of Molecules:1
Biological Source:Sulfoacidibacillus thermotolerans
Primary Citation
An AsCas12f-based compact genome-editing tool derived by deep mutational scanning and structural analysis.
Cell 186 4920 4935.e23 (2023)
PMID: 37776859 DOI: 10.1016/j.cell.2023.08.031

Abstact

SpCas9 and AsCas12a are widely utilized as genome-editing tools in human cells. However, their relatively large size poses a limitation for delivery by cargo-size-limited adeno-associated virus (AAV) vectors. The type V-F Cas12f from Acidibacillus sulfuroxidans is exceptionally compact (422 amino acids) and has been harnessed as a compact genome-editing tool. Here, we developed an approach, combining deep mutational scanning and structure-informed design, to successfully generate two AsCas12f activity-enhanced (enAsCas12f) variants. Remarkably, the enAsCas12f variants exhibited genome-editing activities in human cells comparable with those of SpCas9 and AsCas12a. The cryoelectron microscopy (cryo-EM) structures revealed that the mutations stabilize the dimer formation and reinforce interactions with nucleic acids to enhance their DNA cleavage activities. Moreover, enAsCas12f packaged with partner genes in an all-in-one AAV vector exhibited efficient knock-in/knock-out activities and transcriptional activation in mice. Taken together, enAsCas12f variants could offer a minimal genome-editing platform for in vivo gene therapy.

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Primary Citation of related structures