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- EMDB-15697: Cryo-EM structure of shCas12k-sgRNA-dsDNA ternary complex (type V... -

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Basic information

Entry
Database: EMDB / ID: EMD-15697
TitleCryo-EM structure of shCas12k-sgRNA-dsDNA ternary complex (type V-K CRISPR-associated transposon)
Map data
Sample
  • Complex: Ternary complex of ShCas12k bound to sgRNA and dsDNA.
    • Protein or peptide: Cas12k
    • RNA: sgRNA
    • DNA: DNA target strand
    • DNA: DNA non-target strand
  • Ligand: water
KeywordsCRISPR / complex / transposition / DNA BINDING PROTEIN
Function / homology: / Cas12k
Function and homology information
Biological speciesScytonema hofmannii (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.96 Å
AuthorsTenjo-Castano F / Sofos N / Stella S / Fuglsang A / Pape T / Mesa P / Stutzke LS / Temperini P / Montoya G
Funding support Denmark, 4 items
OrganizationGrant numberCountry
Novo Nordisk FoundationNNF0024386 Denmark
Novo Nordisk FoundationNNF14CC0001 Denmark
Novo Nordisk FoundationNNF17SA0030214 Denmark
Novo Nordisk FoundationNNF18OC0055061 Denmark
CitationJournal: Mol Cell / Year: 2024
Title: Conformational landscape of the type V-K CRISPR-associated transposon integration assembly.
Authors: Francisco Tenjo-Castaño / Nicholas Sofos / Luisa S Stutzke / Piero Temperini / Anders Fuglsang / Tillmann Pape / Pablo Mesa / Guillermo Montoya /
Abstract: CRISPR-associated transposons (CASTs) are mobile genetic elements that co-opt CRISPR-Cas systems for RNA-guided DNA transposition. CASTs integrate large DNA cargos into the attachment (att) site ...CRISPR-associated transposons (CASTs) are mobile genetic elements that co-opt CRISPR-Cas systems for RNA-guided DNA transposition. CASTs integrate large DNA cargos into the attachment (att) site independently of homology-directed repair and thus hold promise for eukaryotic genome engineering. However, the functional diversity and complexity of CASTs hinder an understanding of their mechanisms. Here, we present the high-resolution cryoelectron microscopy (cryo-EM) structure of the reconstituted ∼1 MDa post-transposition complex of the type V-K CAST, together with different assembly intermediates and diverse TnsC filament lengths, thus enabling the recapitulation of the integration complex formation. The results of mutagenesis experiments probing the roles of specific residues and TnsB-binding sites show that transposition activity can be enhanced and suggest that the distance between the PAM and att sites is determined by the lengths of the TnsB C terminus and the TnsC filament. This singular model of RNA-guided transposition provides a foundation for repurposing the system for genome-editing applications.
History
DepositionAug 31, 2022-
Header (metadata) releaseApr 10, 2024-
Map releaseApr 10, 2024-
UpdateJul 3, 2024-
Current statusJul 3, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_15697.png

Downloads & links

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Map

FileDownload / File: emd_15697.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 0.832 Å
Density
Contour LevelBy AUTHOR: 0.2
Minimum - Maximum-0.63340837 - 1.4634585
Average (Standard dev.)-0.0009941137 (±0.024763724)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 319.488 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_15697_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: DeepEMhancer map used for model building

Fileemd_15697_additional_1.map
AnnotationDeepEMhancer map used for model building
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_15697_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_15697_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 : Ternary complex of ShCas12k bound to sgRNA and dsDNA.

EntireName: Ternary complex of ShCas12k bound to sgRNA and dsDNA.
Components
  • Complex: Ternary complex of ShCas12k bound to sgRNA and dsDNA.
    • Protein or peptide: Cas12k
    • RNA: sgRNA
    • DNA: DNA target strand
    • DNA: DNA non-target strand
  • Ligand: water

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Supramolecule #1: Ternary complex of ShCas12k bound to sgRNA and dsDNA.

SupramoleculeName: Ternary complex of ShCas12k bound to sgRNA and dsDNA. / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Scytonema hofmannii (bacteria)
Molecular weightTheoretical: 193 KDa

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Macromolecule #1: Cas12k

MacromoleculeName: Cas12k / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Scytonema hofmannii (bacteria)
Molecular weightTheoretical: 74.738258 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSQITIQARL ISFESNRQQL WKLMADLNTP LINELLCQLG QHPDFEKWQQ KGKLPSTVVS QLCQPLKTDP RFAGQPSRLY MSAIHIVDY IYKSWLAIQK RLQQQLDGKT RWLEMLNSDA ELVELSGDTL EAIRVKAAEI LAIAMPASES DSASPKGKKG K KEKKPSSS ...String:
MSQITIQARL ISFESNRQQL WKLMADLNTP LINELLCQLG QHPDFEKWQQ KGKLPSTVVS QLCQPLKTDP RFAGQPSRLY MSAIHIVDY IYKSWLAIQK RLQQQLDGKT RWLEMLNSDA ELVELSGDTL EAIRVKAAEI LAIAMPASES DSASPKGKKG K KEKKPSSS SPKRSLSKTL FDAYQETEDI KSRSAISYLL KNGCKLTDKE EDSEKFAKRR RQVEIQIQRL TEKLISRMPK GR DLTNAKW LETLLTATTT VAEDNAQAKR WQDILLTRSS SLPFPLVFET NEDMVWSKNQ KGRLCVHFNG LSDLIFEVYC GNR QLHWFQ RFLEDQQTKR KSKNQHSSGL FTLRNGHLVW LEGEGKGEPW NLHHLTLYCC VDNRLWTEEG TEIVRQEKAD EITK FITNM KKKSDLSDTQ QALIQRKQST LTRINNSFER PSQPLYQGQS HILVGVSLGL EKPATVAVVD AIANKVLAYR SIKQL LGDN YELLNRQRRQ QQYLSHERHK AQKNFSPNQF GASELGQHID RLLAKAIVAL ARTYKAGSIV LPKLGDMREV VQSEIQ AIA EQKFPGYIEG QQKYAKQYRV NVHRWSYGRL IQSIQSKAAQ TGIVIEEGKQ PIRGSPHDKA KELALSAYNL RLTRRSG SE FELENLYFQ

UniProtKB: Cas12k

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Macromolecule #2: sgRNA

MacromoleculeName: sgRNA / type: rna / ID: 2 / Number of copies: 1
Source (natural)Organism: Scytonema hofmannii (bacteria)
Molecular weightTheoretical: 84.006516 KDa
SequenceString: GGAUAUUAAU AGCGCCGCAA UUCAUGCUGC UUGCAGCCUC UGAAUUUUGU UAAAUGAGGG UUAGUUUGAC UGUAUAAAUA CAGUCUUGC UUUCUGACCC UGGUAGCUGC UCACCCUGAU GCUGCUGUCA AUAGACAGGA UAGGUGCGCU CCCAGCAAUA A GGGCGCGG ...String:
GGAUAUUAAU AGCGCCGCAA UUCAUGCUGC UUGCAGCCUC UGAAUUUUGU UAAAUGAGGG UUAGUUUGAC UGUAUAAAUA CAGUCUUGC UUUCUGACCC UGGUAGCUGC UCACCCUGAU GCUGCUGUCA AUAGACAGGA UAGGUGCGCU CCCAGCAAUA A GGGCGCGG AUGUACUGCU GUAGUGGCUA CUGAAUCACC CCCGAUCAAG GGGGAACCCU CCAAAAGGUG GGUUGAAAGG AG AAGUCAU UUAAUAAGGC CACU

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Macromolecule #3: DNA target strand

MacromoleculeName: DNA target strand / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Scytonema hofmannii (bacteria)
Molecular weightTheoretical: 16.858855 KDa
SequenceString: (DC)(DT)(DA)(DG)(DA)(DA)(DA)(DG)(DA)(DC) (DT)(DT)(DT)(DT)(DA)(DA)(DC)(DA)(DG)(DT) (DG)(DG)(DC)(DC)(DT)(DT)(DA)(DT)(DT) (DA)(DA)(DA)(DT)(DG)(DA)(DC)(DT)(DT)(DC) (DT) (DC)(DA)(DA)(DC)(DC)(DA) ...String:
(DC)(DT)(DA)(DG)(DA)(DA)(DA)(DG)(DA)(DC) (DT)(DT)(DT)(DT)(DA)(DA)(DC)(DA)(DG)(DT) (DG)(DG)(DC)(DC)(DT)(DT)(DA)(DT)(DT) (DA)(DA)(DA)(DT)(DG)(DA)(DC)(DT)(DT)(DC) (DT) (DC)(DA)(DA)(DC)(DC)(DA)(DT)(DC) (DT)(DT)(DG)(DC)(DT)(DG)(DA)

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Macromolecule #4: DNA non-target strand

MacromoleculeName: DNA non-target strand / type: dna / ID: 4 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Scytonema hofmannii (bacteria)
Molecular weightTheoretical: 17.027963 KDa
SequenceString: (DT)(DC)(DA)(DG)(DC)(DA)(DA)(DG)(DA)(DT) (DG)(DG)(DT)(DT)(DG)(DA)(DG)(DA)(DA)(DG) (DT)(DC)(DA)(DT)(DT)(DT)(DA)(DA)(DT) (DA)(DA)(DG)(DG)(DC)(DC)(DA)(DC)(DT)(DG) (DT) (DT)(DA)(DA)(DA)(DA)(DG) ...String:
(DT)(DC)(DA)(DG)(DC)(DA)(DA)(DG)(DA)(DT) (DG)(DG)(DT)(DT)(DG)(DA)(DG)(DA)(DA)(DG) (DT)(DC)(DA)(DT)(DT)(DT)(DA)(DA)(DT) (DA)(DA)(DG)(DG)(DC)(DC)(DA)(DC)(DT)(DG) (DT) (DT)(DA)(DA)(DA)(DA)(DG)(DT)(DC) (DT)(DT)(DT)(DC)(DT)(DA)(DG)

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Macromolecule #5: water

MacromoleculeName: water / type: ligand / ID: 5 / Number of copies: 3 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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

Concentration9.6 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
300.0 mMKClsodium chloride
30.0 mMHEPES2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid
5.0 mMMgCl2magnesium chloride
1.0 mMTCEPTris(2-carboxyethyl)phosphine
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: 3 s blotting, 4 degrees celcius.

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 1 / Number real images: 2231 / Average exposure time: 45.0 sec. / Average electron dose: 45.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 96000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 858078
Startup modelType of model: OTHER / Details: A reconstruction of the shCas12k-sgRNA complex
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.96 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.3.1) / Number images used: 136646
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.2.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1)
Final 3D classificationNumber classes: 50 / Avg.num./class: 3000 / Software - Name: cryoSPARC (ver. 3.2.0)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

PDB-8axa:
Cryo-EM structure of shCas12k-sgRNA-dsDNA ternary complex (type V-K CRISPR-associated transposon)

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