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- EMDB-39955: Focused map for area 1 of type III CRISPR-associated deaminase in... -

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Basic information

Entry
Database: EMDB / ID: EMD-39955
TitleFocused map for area 1 of type III CRISPR-associated deaminase in complex cA6 and ATP
Map data
Sample
  • Complex: CRISPR-associated adenosine deaminase
Keywordsdefense system / deaminase / IMMUNE SYSTEM
Biological speciesLimisphaera ngatamarikiensis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.67 Å
AuthorsChen MR / Li ZX / Xiao YB
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Science / Year: 2025
Title: Antiviral signaling of a type III CRISPR-associated deaminase.
Authors: Yutao Li / Zhaoxing Li / Purui Yan / Chenyang Hua / Jianping Kong / Wanqian Wu / Yurong Cui / Yan Duan / Shunxiang Li / Guanglei Li / Shunli Ji / Yijun Chen / Yucheng Zhao / Peng Yang / ...Authors: Yutao Li / Zhaoxing Li / Purui Yan / Chenyang Hua / Jianping Kong / Wanqian Wu / Yurong Cui / Yan Duan / Shunxiang Li / Guanglei Li / Shunli Ji / Yijun Chen / Yucheng Zhao / Peng Yang / Chunyi Hu / Meiling Lu / Meirong Chen / Yibei Xiao /
Abstract: Prokaryotes have evolved diverse defense strategies against viral infection, including foreign nucleic acid degradation by CRISPR-Cas systems and DNA and RNA synthesis inhibition through nucleotide ...Prokaryotes have evolved diverse defense strategies against viral infection, including foreign nucleic acid degradation by CRISPR-Cas systems and DNA and RNA synthesis inhibition through nucleotide pool depletion. Here, we report an antiviral mechanism of type III CRISPR-Cas-regulated adenosine triphosphate (ATP) depletion in which ATP is converted into inosine triphosphate (ITP) by CRISPR-Cas-associated adenosine deaminase (CAAD) upon activation by either cA or cA, followed by hydrolysis into inosine monophosphate (IMP) by Nudix hydrolase, ultimately resulting in cell growth arrest. The cryo-electron microscopy structures of CAAD in its apo and activated forms, together with biochemical evidence, revealed how cA or cA binds to the CRISPR-associated Rossmann fold (CARF) domain and abrogates CAAD autoinhibition, inducing substantial conformational changes that reshape the structure of CAAD and induce its deaminase activity. Our results reveal the mechanism of a CRISPR-Cas-regulated ATP depletion antiviral strategy.
History
DepositionMay 1, 2024-
Header (metadata) releaseDec 25, 2024-
Map releaseDec 25, 2024-
UpdateMar 5, 2025-
Current statusMar 5, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_39955.png

Downloads & links

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Map

FileDownload / File: emd_39955.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.93 Å/pix.
x 512 pix.
= 477.184 Å		0.93 Å/pix.
x 512 pix.
= 477.184 Å		0.93 Å/pix.
x 512 pix.
= 477.184 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.932 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.18
Minimum - Maximum-0.3075456 - 0.67205054
Average (Standard dev.)0.00015741731 (±0.008975252)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 477.184 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_39955_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_39955_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : CRISPR-associated adenosine deaminase

EntireName: CRISPR-associated adenosine deaminase
Components
  • Complex: CRISPR-associated adenosine deaminase

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Supramolecule #1: CRISPR-associated adenosine deaminase

SupramoleculeName: CRISPR-associated adenosine deaminase / type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Limisphaera ngatamarikiensis (bacteria)

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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

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.67 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 55742
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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