6W5C image
Entry Detail
PDB ID:
6W5C
EMDB ID:
Title:
Cryo-EM structure of Cas12i(E894A)-crRNA-dsDNA complex
Biological Source:
PDB Version:
Deposition Date:
2020-03-13
Release Date:
2020-09-16
Method Details:
Experimental Method:
Resolution:
2.90 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cas12i
Chain IDs:A
Chain Length:1092
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium ND2006
Polymer Type:polyribonucleotide
Description:crRNA
Chain IDs:E (auth: B)
Chain Length:59
Number of Molecules:1
Biological Source:Escherichia coli
Polymer Type:polydeoxyribonucleotide
Description:TS
Chain IDs:B (auth: C)
Chain Length:36
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium ND2006
Polymer Type:polydeoxyribonucleotide
Description:NTS
Chain IDs:C (auth: D)
Chain Length:10
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium ND2006
Polymer Type:polydeoxyribonucleotide
Description:Substrate
Chain IDs:D (auth: E)
Chain Length:9
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium ND2006
Ligand Molecules
Primary Citation
Mechanisms for target recognition and cleavage by the Cas12i RNA-guided endonuclease.
Nat.Struct.Mol.Biol. 27 1069 1076 (2020)
PMID: 32895556 DOI: 10.1038/s41594-020-0499-0

Abstact

Cas12i is a recently identified type V CRISPR-Cas endonuclease that predominantly cleaves the non-target strand of a double-stranded DNA substrate. This nicking activity of Cas12i could potentially be used for genome editing with high specificity. To elucidate its mechanisms for target recognition and cleavage, we determined cryo-EM structures of Cas12i in multiple functional states. Cas12i pre-orders a seven-nucleotide seed sequence of the crRNA for target recognition and undergoes a two-step activation through crRNA-DNA hybridization. Formation of 14 base pairs activates the nickase activity, and 28-bp hybridization promotes cleavage of the target strand. The atomic structures and mechanistic insights gained should facilitate the manipulation of Cas12i for genome editing applications.

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Primary Citation of related structures