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- EMDB-23849: Half integration complex of Cas1-Cas2 in Cas4 containing system -

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Basic information

Entry
Database: EMDB / ID: EMD-23849
TitleHalf integration complex of Cas1-Cas2 in Cas4 containing system
Map data
Sample
  • Complex: Half integration complex and Cas4 dissociated from PAM side
    • Protein or peptide: half integration complex of Cas1-Cas2
Function / homology
Function and homology information


5' to 3' exodeoxyribonuclease (nucleoside 3'-phosphate-forming) / exonuclease activity / maintenance of CRISPR repeat elements / RNA endonuclease activity / 4 iron, 4 sulfur cluster binding / endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / DNA binding / metal ion binding
Similarity search - Function
CRISPR-associated protein Cas4 / Dna2/Cas4, domain of unknown function DUF83 / Domain of unknown function DUF83 / CRISPR-associated endonuclease Cas2 / Virulence-associated protein D / CRISPR associated protein Cas2 / CRISPR associated protein Cas2 / CRISPR-associated endonuclease Cas1, N-terminal domain / CRISPR-associated protein Cas1 / CRISPR-associated endonuclease Cas1, C-terminal domain / CRISPR associated protein Cas1 / PD-(D/E)XK endonuclease-like domain superfamily
Similarity search - Domain/homology
CRISPR-associated endoribonuclease Cas2 / CRISPR-associated exonuclease Cas4/endonuclease Cas1 fusion
Similarity search - Component
Biological speciesGeobacter sulfurreducens (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.8 Å
AuthorsHu CY / Ke AK
CitationJournal: Nature / Year: 2021
Title: Mechanism for Cas4-assisted directional spacer acquisition in CRISPR-Cas.
Authors: Chunyi Hu / Cristóbal Almendros / Ki Hyun Nam / Ana Rita Costa / Jochem N A Vink / Anna C Haagsma / Saket R Bagde / Stan J J Brouns / Ailong Ke /
Abstract: Prokaryotes adapt to challenges from mobile genetic elements by integrating spacers derived from foreign DNA in the CRISPR array. Spacer insertion is carried out by the Cas1-Cas2 integrase complex. A ...Prokaryotes adapt to challenges from mobile genetic elements by integrating spacers derived from foreign DNA in the CRISPR array. Spacer insertion is carried out by the Cas1-Cas2 integrase complex. A substantial fraction of CRISPR-Cas systems use a Fe-S cluster containing Cas4 nuclease to ensure that spacers are acquired from DNA flanked by a protospacer adjacent motif (PAM) and inserted into the CRISPR array unidirectionally, so that the transcribed CRISPR RNA can guide target searching in a PAM-dependent manner. Here we provide a high-resolution mechanistic explanation for the Cas4-assisted PAM selection, spacer biogenesis and directional integration by type I-G CRISPR in Geobacter sulfurreducens, in which Cas4 is naturally fused with Cas1, forming Cas4/Cas1. During biogenesis, only DNA duplexes possessing a PAM-embedded 3'-overhang trigger Cas4/Cas1-Cas2 assembly. During this process, the PAM overhang is specifically recognized and sequestered, but is not cleaved by Cas4. This 'molecular constipation' prevents the PAM-side prespacer from participating in integration. Lacking such sequestration, the non-PAM overhang is trimmed by host nucleases and integrated to the leader-side CRISPR repeat. Half-integration subsequently triggers PAM cleavage and Cas4 dissociation, allowing spacer-side integration. Overall, the intricate molecular interaction between Cas4 and Cas1-Cas2 selects PAM-containing prespacers for integration and couples the timing of PAM processing with the stepwise integration to establish directionality.
History
DepositionApr 16, 2021-
Header (metadata) releaseNov 17, 2021-
Map releaseNov 17, 2021-
UpdateNov 17, 2021-
Current statusNov 17, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.145
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.145
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23849.png

Downloads & links

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Map

FileDownload / File: emd_23849.map.gz / Format: CCP4 / Size: 36.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.32 Å
Density
Contour LevelBy AUTHOR: 0.145 / Movie #1: 0.145
Minimum - Maximum-0.17644785 - 0.9397226
Average (Standard dev.)-0.00034170382 (±0.029530449)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions212212212
Spacing212212212
CellA=B=C: 279.84 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.321.321.32
M x/y/z212212212
origin x/y/z0.0000.0000.000
length x/y/z279.840279.840279.840
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ376376376
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS212212212
D min/max/mean-0.1760.940-0.000

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Supplemental data

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Sample components

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Entire : Half integration complex and Cas4 dissociated from PAM side

EntireName: Half integration complex and Cas4 dissociated from PAM side
Components
  • Complex: Half integration complex and Cas4 dissociated from PAM side
    • Protein or peptide: half integration complex of Cas1-Cas2

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Supramolecule #1: Half integration complex and Cas4 dissociated from PAM side

SupramoleculeName: Half integration complex and Cas4 dissociated from PAM side
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all / Details: half integration in cas4 containing system
Source (natural)Organism: Geobacter sulfurreducens (bacteria) / Strain: ATCC 51573 / DSM 12127 / PCA
Molecular weightExperimental: 300 KDa

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Macromolecule #1: half integration complex of Cas1-Cas2

MacromoleculeName: half integration complex of Cas1-Cas2 / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Geobacter sulfurreducens (bacteria) / Strain: ATCC 51573 / DSM 12127 / PCA
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MAETDGSIPL IPVRMLNEHV YCPRLAYLMW VQGEFSHNEF TVDGVIRHRR VDAGGGVLPS ETQEDSRIH ARSVSLSSER LGITAKIDLV EGEGAYVSPV DYKRGKRPHV AGGAYEPERV Q LCAQGLLL REHGFASDGG ALYFVASRER VPVAFDDELI GRTLAAIDEM ...String:
MAETDGSIPL IPVRMLNEHV YCPRLAYLMW VQGEFSHNEF TVDGVIRHRR VDAGGGVLPS ETQEDSRIH ARSVSLSSER LGITAKIDLV EGEGAYVSPV DYKRGKRPHV AGGAYEPERV Q LCAQGLLL REHGFASDGG ALYFVASRER VPVAFDDELI GRTLAAIDEM GRTALSGTMP PP LEDSPKC PRCSLVGICL PDEVRFLSHL SVEPRPIIPA DGRGLPLYVQ SPKAYVRKDG DCL VIEEER VRVAEARLGE TSQVALFGNA TLTTAALHEC LRREIPVTWL SYGGWFMGHT VSTG HRNVE TRTYQYQRSF DPETCLNLAR RWIVAKIANC RTLLRRNWRG EGDEAKAPPG LLMSL QDDM RHAMRAPSLE VLLGIEGASA GRYFQHFSRM LRGGDGEGMG FDFTTRNRRP PKDPVN ALL SFAYAMLTRE WTVALAAVGL DPYRGFYHQP RFGRPALALD MMEPFRPLIA DSTVLMA IN NGEIRTGDFV RSAGGCNLTD SARKRFIAGF ERRMEQEVTH PIFKYTISYR RLLEVQAR L LTRYLSGEIP AYPNFVTR

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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

Concentration1.0 mg/mL
BufferpH: 7.5 / Component - Concentration: 150.0 mM / Component - Formula: NaClSodium chloride / Component - Name: sodium chloride / Details: with 5 mM DTT
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV / Details: 6 seconds.

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Electron microscopy

MicroscopeTFS TALOS
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION / Cs: 2.7 mm / Nominal defocus min: 1.5 µm
Specialist opticsPhase plate: VOLTA PHASE PLATE
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 1200 / Average exposure time: 0.35 sec. / Average electron dose: 50.0 e/Å2

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Image processing

CTF correctionSoftware - Name: EMAN
Initial angle assignmentType: OTHER
Final 3D classificationSoftware - Name: cryoSPARC
Final angle assignmentType: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 5.8 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 20000

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Atomic model buiding 1

RefinementProtocol: OTHER

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