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- PDB-8zq9: Cryo-EM structure of the Cas9d-sgRNA complex -

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Basic information

Entry
Database: PDB / ID: 8zq9
TitleCryo-EM structure of the Cas9d-sgRNA complex
Components
  • RNA (128-MER)
  • a protein
KeywordsANTIVIRAL PROTEIN / a protein complex
Function / homologyRNA / RNA (> 10) / RNA (> 100)
Function and homology information
Biological speciesmetagenome (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.87 Å
AuthorsZhang, H. / Li, X. / Liu, Z.
Funding support China, 1items
OrganizationGrant numberCountry
Other government China
CitationJournal: Nat Commun / Year: 2025
Title: Insights into the compact CRISPR-Cas9d system.
Authors: Jie Yang / Tongyao Wang / Ying Huang / Zhaoyi Long / Xuzichao Li / Shuqin Zhang / Lingling Zhang / Zhikun Liu / Qian Zhang / Huabing Sun / Minjie Zhang / Hang Yin / Zhongmin Liu / Heng Zhang /
Abstract: Cas9d, the smallest known member of the Cas9 family, employs a compact domain architecture for effective target cleavage. However, the underlying mechanism remains unclear. Here, we present the cryo- ...Cas9d, the smallest known member of the Cas9 family, employs a compact domain architecture for effective target cleavage. However, the underlying mechanism remains unclear. Here, we present the cryo-EM structures of the Cas9d-sgRNA complex in both target-free and target-bound states. Biochemical assays elucidated the PAM recognition and DNA cleavage mechanisms of Cas9d. Structural comparisons revealed that at least 17 base pairs in the guide-target heteroduplex is required for nuclease activity. Beyond its typical role as an adaptor between Cas9 enzymes and targets, the sgRNA also provides structural support and functional regulation for Cas9d. A segment of the sgRNA scaffold interacts with the REC domain to form a functional target recognition module. Upon target binding, this module undergoes a coordinated conformational rearrangement, enabling heteroduplex propagation and facilitating nuclease activity. This hybrid functional module precisely monitors heteroduplex complementarity, resulting in a lower mismatch tolerance compared to SpyCas9. Moreover, structure-guided engineering in both the sgRNA and Cas9d protein led to a more compact Cas9 system with well-maintained nuclease activity. Altogether, our findings provide insights into the target recognition and cleavage mechanisms of Cas9d and shed light on the development of high-fidelity mini-CRISPR tools.
History
DepositionJun 1, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 5, 2025Provider: repository / Type: Initial release
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Revision 1.0Feb 5, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: RNA (128-MER)
B: a protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)137,8893
Polymers137,8242
Non-polymers651
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: RNA chain RNA (128-MER)


Mass: 51127.133 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) metagenome (others) / Production host: Escherichia coli (E. coli)
#2: Protein a protein


Mass: 86696.844 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) metagenome (others) / Production host: Escherichia coli (E. coli)
#3: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
Has ligand of interestN
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: a protein / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: metagenome (others)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 2.87 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 229218 / Symmetry type: POINT

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