7N3P image
Entry Detail
PDB ID:
7N3P
EMDB ID:
EMD-24143
Keywords:
RNA BINDING PROTEIN/RNA/DNA
Title:
Cryo-EM structure of the Cas12k-sgRNA-dsDNA complex
Biological Source:
Source Organism:
Scytonema hofmannii
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2021-06-01
Release Date:
2021-09-01
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.65 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7N3P validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Cas12k
Chain IDs:A
Chain Length:639
Number of Molecules:1
Biological Source:Scytonema hofmannii
UniProt ID:A0A8M0FGU0
Polymer Type:polyribonucleotide
Description:Single guide RNA
Chain IDs:B
Chain Length:265
Number of Molecules:1
Biological Source:Scytonema hofmannii
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(*CP*AP*TP*GP*AP*CP*TP*TP*CP*TP*CP*AP*AP*CP*CP*GP*AP*GP*TP*TP*T)-3')
Chain IDs:C
Chain Length:40
Number of Molecules:1
Biological Source:Scytonema hofmannii
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(P*AP*AP*AP*CP*TP*CP*GP*GP*TP*T)-3')
Chain IDs:D
Chain Length:11
Number of Molecules:1
Biological Source:Scytonema hofmannii
Ligand Molecules
NA
Primary Citation
Structural basis of target DNA recognition by CRISPR-Cas12k for RNA-guided DNA transposition.
Mol.Cell 81 4457 4466.e5 (2021)
PMID: 34450043 DOI: 10.1016/j.molcel.2021.07.043

Abstact

The type V-K CRISPR-Cas system, featured by Cas12k effector with a naturally inactivated RuvC domain and associated with Tn7-like transposon for RNA-guided DNA transposition, is a promising tool for precise DNA insertion. To reveal the mechanism underlying target DNA recognition, we determined a cryoelectron microscopy (cryo-EM) structure of Cas12k from cyanobacteria Scytonema hofmanni in complex with a single guide RNA (sgRNA) and a double-stranded target DNA. Coupled with mutagenesis and in vitro DNA transposition assay, our results revealed mechanisms for the recognition of the GGTT protospacer adjacent motif (PAM) sequence and the structural elements of Cas12k critical for RNA-guided DNA transposition. These structural and mechanistic insights should aid in the development of type V-K CRISPR-transposon systems as tools for genome editing.

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Primary Citation of related structures
7N3P