8H9D image
Entry Detail
PDB ID:
8H9D
Title:
Crystal structure of Cas12a protein
Biological Source:
PDB Version:
Deposition Date:
2022-10-25
Release Date:
2023-02-08
Method Details:
Experimental Method:
Resolution:
3.10 Å
R-Value Free:
0.25
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cas12A
Chain IDs:B (auth: A)
Chain Length:1207
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium
Polymer Type:polypeptide(L)
Description:Cas12A
Chain IDs:A (auth: B)
Chain Length:1206
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium
Polymer Type:polyribonucleotide
Description:RNA (5'-R(P*AP*AP*UP*UP*UP*CP*UP*AP*CP*UP*AP*AP*GP*UP*GP*UP*AP*GP*AP*UP*C)-3')
Chain IDs:C (auth: G)
Chain Length:21
Number of Molecules:1
Biological Source:Lachnospiraceae bacterium
Primary Citation
Structures of apo Cas12a and its complex with crRNA and DNA reveal the dynamics of ternary complex formation and target DNA cleavage.
Plos Biol. 21 e3002023 e3002023 (2023)
PMID: 36917574 DOI: 10.1371/journal.pbio.3002023

Abstact

Cas12a is a programmable nuclease for adaptive immunity against invading nucleic acids in CRISPR-Cas systems. Here, we report the crystal structures of apo Cas12a from Lachnospiraceae bacterium MA2020 (Lb2) and the Lb2Cas12a+crRNA complex, as well as the cryo-EM structure and functional studies of the Lb2Cas12a+crRNA+DNA complex. We demonstrate that apo Lb2Cas12a assumes a unique, elongated conformation, whereas the Lb2Cas12a+crRNA binary complex exhibits a compact conformation that subsequently rearranges to a semi-open conformation in the Lb2Cas12a+crRNA+DNA ternary complex. Notably, in solution, apo Lb2Cas12a is dynamic and can exist in both elongated and compact forms. Residues from Met493 to Leu523 of the WED domain undergo major conformational changes to facilitate the required structural rearrangements. The REC lobe of Lb2Cas12a rotates 103° concomitant with rearrangement of the hinge region close to the WED and RuvC II domains to position the RNA-DNA duplex near the catalytic site. Our findings provide insight into crRNA recognition and the mechanism of target DNA cleavage.

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