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- EMDB-60330: Cryo-EM structure of Cas5-HNH Cascade bound with sDNA, Conf2 -

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Basic information

Entry
Database: EMDB / ID: EMD-60330
TitleCryo-EM structure of Cas5-HNH Cascade bound with sDNA, Conf2
Map data
Sample
  • Complex: Cas5-HNH Cascade
    • RNA: RNA (61-MER)
    • Protein or peptide: CRISPR system Cascade subunit CasC
    • Protein or peptide: CRISPR system Cascade subunit CasD
    • DNA: DNA (60-MER)
KeywordsCryo-EM strcuture / Cascade / CRISPR-Cas / IMMUNE SYSTEM/DNA/RNA / IMMUNE SYSTEM-DNA-RNA complex
Function / homology
Function and homology information


maintenance of CRISPR repeat elements / endonuclease activity / defense response to virus / RNA binding / zinc ion binding
Similarity search - Function
CRISPR-associated protein, CT1975 / CT1975-like protein / CRISPR-associated protein, CasD / HNH endonuclease / HNH endonuclease / CRISPR-associated protein, Cas5 / CRISPR-associated protein (Cas_Cas5) / CRISPR-associated protein Cas5, N-terminal / HNH nucleases / HNH nuclease
Similarity search - Domain/homology
CRISPR system Cascade subunit CasC / CRISPR system Cascade subunit CasD
Similarity search - Component
Biological speciesCandidatus Cloacimonetes bacterium ADurb.Bin088 (bacteria) / Escherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsLiu YN / Wang L / Zhang H / Zhu H
Funding support China, 1 items
OrganizationGrant numberCountry
Chinese Academy of Sciences China
CitationJournal: Nat Commun / Year: 2025
Title: Structural basis for RNA-guided DNA degradation by Cas5-HNH/Cascade complex.
Authors: Yanan Liu / Lin Wang / Qian Zhang / Pengyu Fu / Lingling Zhang / Ying Yu / Heng Zhang / Hongtao Zhu /
Abstract: Type I-E CRISPR (clustered regularly interspaced short palindromic repeats)-Cas (CRISPR-associated proteins) system is one of the most extensively studied RNA-guided adaptive immune systems in ...Type I-E CRISPR (clustered regularly interspaced short palindromic repeats)-Cas (CRISPR-associated proteins) system is one of the most extensively studied RNA-guided adaptive immune systems in prokaryotes, providing defense against foreign genetic elements. Unlike the previously characterized Cas3 nuclease, which exhibits progressive DNA cleavage in the typical type I-E system, a recently identified HNH-comprising Cascade system enables precise DNA cleavage. Here, we present several near-atomic cryo-electron microscopy (cryo-EM) structures of the Candidatus Cloacimonetes bacterium Cas5-HNH/Cascade complex, both in its DNA-bound and unbound states. Our analysis reveals extensive interactions between the HNH domain and adjacent subunits, including Cas6 and Cas11, with mutations in these key interactions significantly impairing enzymatic activity. Upon DNA binding, the Cas5-HNH/Cascade complex adopts a more compact conformation, with subunits converging toward the center of nuclease, leading to its activation. Notably, we also find that divalent ions such as zinc, cobalt, and nickel down-regulate enzyme activity by destabilizing the Cascade complex. Together, these findings offer structural insights into the assembly and activation of the Cas5-HNH/Cascade complex.
History
DepositionMay 29, 2024-
Header (metadata) releaseDec 11, 2024-
Map releaseDec 11, 2024-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_60330.png

Downloads & links

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Map

FileDownload / File: emd_60330.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.81 Å/pix.
x 360 pix.
= 290.88 Å		0.81 Å/pix.
x 360 pix.
= 290.88 Å		0.81 Å/pix.
x 360 pix.
= 290.88 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.808 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.124
Minimum - Maximum-0.0017808691 - 2.2051158
Average (Standard dev.)0.0017500421 (±0.03068637)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 290.88 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_60330_additional_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_60330_half_map_1.map
Projections & Slices
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_60330_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : Cas5-HNH Cascade

EntireName: Cas5-HNH Cascade
Components
  • Complex: Cas5-HNH Cascade
    • RNA: RNA (61-MER)
    • Protein or peptide: CRISPR system Cascade subunit CasC
    • Protein or peptide: CRISPR system Cascade subunit CasD
    • DNA: DNA (60-MER)

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Supramolecule #1: Cas5-HNH Cascade

SupramoleculeName: Cas5-HNH Cascade / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Candidatus Cloacimonetes bacterium ADurb.Bin088 (bacteria)
Molecular weightTheoretical: 400 kDa/nm

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Macromolecule #1: RNA (61-MER)

MacromoleculeName: RNA (61-MER) / type: rna / ID: 1 / Number of copies: 1
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 19.697695 KDa
SequenceString:
GUGAACCGGA UUGCCGUCAG GAAAUUAGGU GCGCUUAGCA GUAUUCCCCA CGCAUGUGGG G

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Macromolecule #2: CRISPR system Cascade subunit CasC

MacromoleculeName: CRISPR system Cascade subunit CasC / type: protein_or_peptide / ID: 2 / Number of copies: 6 / Enantiomer: LEVO
Source (natural)Organism: Candidatus Cloacimonetes bacterium ADurb.Bin088 (bacteria)
Molecular weightTheoretical: 41.794367 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MLIEIHMIQN HSPANLNRDD LGAPKTCYFG GVLRSRISSQ CIKRSIRTSN DFKALLGGVR TRRLADLIQQ EAGETECWKK AQEILNKCG FKNKDDNTKM LVFMSKDKIK DLARIVLDNS LGLTEAAQQV ANVIAQATLA PDIALCGRML EPNDKDKDKK V KWSNTTVE ...String:
MLIEIHMIQN HSPANLNRDD LGAPKTCYFG GVLRSRISSQ CIKRSIRTSN DFKALLGGVR TRRLADLIQQ EAGETECWKK AQEILNKCG FKNKDDNTKM LVFMSKDKIK DLARIVLDNS LGLTEAAQQV ANVIAQATLA PDIALCGRML EPNDKDKDKK V KWSNTTVE AALQVAHAIS THIARPEIDY FVAADDVPGE DAGAGHIGES MFASACFYKY FSIDWEQLVK NLKGDTNLAA HT VGAFLLA AAKTNPSGKQ NSFAAHNYPD GILVEFKNSP ISYANAFVRP VSVVKESDLV EQSIGQLSNY VNDIRLGYYD EQS PVIGFW FSPNNRYPLG YKHSKLASRN IGNLNELVGA VLDYIGGFKW EEVQKSKAYI GG

UniProtKB: CRISPR system Cascade subunit CasC

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Macromolecule #3: CRISPR system Cascade subunit CasD

MacromoleculeName: CRISPR system Cascade subunit CasD / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Candidatus Cloacimonetes bacterium ADurb.Bin088 (bacteria)
Molecular weightTheoretical: 43.688449 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSAPPNTLFL RLEGALQSWG SNEAKFALRR TADAPTKSGV LGLLCAAMGI GRAEAADSWL PKLANLRMGV RIDRPGIRWW DFHTVGAGQ RMRMAELKAP KKPSMVGAAL AETLTPSKVK TRAETLLSRR EYLADASFLV ALQGEPELVA KLSAALAKPV W AIYLGRKS ...String:
MSAPPNTLFL RLEGALQSWG SNEAKFALRR TADAPTKSGV LGLLCAAMGI GRAEAADSWL PKLANLRMGV RIDRPGIRWW DFHTVGAGQ RMRMAELKAP KKPSMVGAAL AETLTPSKVK TRAETLLSRR EYLADASFLV ALQGEPELVA KLSAALAKPV W AIYLGRKS CPPSRPVCEH PPGFYNTLEE ALSAVPLQKR WHNEPLPQIL PCVMDWIPGY DGEHAPDDAE IHYDLPVSFQ PP RHLPRFV IRRELVVGED VQVSRETGTS VWRPKGTRAD YNNSEYKKVR AERLVMDHAA CMVCKHPATT VQHVNYRRAG GKE IPEDLR ALCRLCHDAC TMLEYGSGMT TNRIDPCDPI WRERILAKRK EIVEFRSRGQ RFRKMKPEEE NG

UniProtKB: CRISPR system Cascade subunit CasD

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Macromolecule #4: DNA (60-MER)

MacromoleculeName: DNA (60-MER) / type: dna / ID: 4 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 18.427801 KDa
SequenceString: (DC)(DG)(DG)(DA)(DG)(DA)(DG)(DC)(DT)(DT) (DG)(DA)(DC)(DA)(DT)(DG)(DT)(DG)(DT)(DG) (DC)(DT)(DA)(DA)(DG)(DC)(DG)(DC)(DA) (DC)(DC)(DT)(DA)(DA)(DT)(DT)(DT)(DC)(DC) (DT) (DG)(DA)(DC)(DG)(DG)(DC) ...String:
(DC)(DG)(DG)(DA)(DG)(DA)(DG)(DC)(DT)(DT) (DG)(DA)(DC)(DA)(DT)(DG)(DT)(DG)(DT)(DG) (DC)(DT)(DA)(DA)(DG)(DC)(DG)(DC)(DA) (DC)(DC)(DT)(DA)(DA)(DT)(DT)(DT)(DC)(DC) (DT) (DG)(DA)(DC)(DG)(DG)(DC)(DA)(DA) (DT)(DC)(DC)(DT)(DT)(DA)(DC)(DC)(DA)(DG) (DC)(DT)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 25.0 µm / Nominal defocus min: 12.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING ONLY
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 53050
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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