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- EMDB-51787: Cas9 in complex with tracrRNA and crRNA, Streptococcus thermophil... -

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Basic information

Entry
Database: EMDB / ID: EMD-51787
TitleCas9 in complex with tracrRNA and crRNA, Streptococcus thermophilus DGCC 7710 CRISPR3 system
Map datasharpened map (phenix.auto_sharpen)
Sample
  • Complex: Cas9:tracrRNA:crRNA complex
    • Protein or peptide: CRISPR-associated endonuclease Cas9
    • RNA: crRNA (5'-R(P*GP*AP*AP*GP*AP*GP*GP*AP*CP*AP*GP*UP*UP*UP*UP*AP*GP*AP*GP*CP*UP*G)-3')
    • RNA: tracrRNA (62-MER)
  • Ligand: CALCIUM ION
KeywordsCas9 / CRISPR-Cas / PAM / spacer acquisition / RNA BINDING PROTEIN
Function / homology
Function and homology information


maintenance of CRISPR repeat elements / endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / hydrolase activity / DNA binding / RNA binding / metal ion binding
Similarity search - Function
CRISPR-associated endonuclease Cas9, PAM-interacting domain / CRISPR-associated endonuclease Cas9, REC lobe / REC lobe of CRISPR-associated endonuclease Cas9 / PAM-interacting domain of CRISPR-associated endonuclease Cas9 / : / Cas9 RuvC domain / HNH endonuclease / CRISPR-associated endonuclease Cas9 / Cas9-type HNH domain / Cas9-type HNH domain profile. ...CRISPR-associated endonuclease Cas9, PAM-interacting domain / CRISPR-associated endonuclease Cas9, REC lobe / REC lobe of CRISPR-associated endonuclease Cas9 / PAM-interacting domain of CRISPR-associated endonuclease Cas9 / : / Cas9 RuvC domain / HNH endonuclease / CRISPR-associated endonuclease Cas9 / Cas9-type HNH domain / Cas9-type HNH domain profile. / HNH nuclease / Ribonuclease H superfamily
Similarity search - Domain/homology
CRISPR-associated endonuclease Cas9
Similarity search - Component
Biological speciesStreptococcus thermophilus DGCC 7710 (bacteria) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.33 Å
AuthorsSasnauskas G / Gaizauskaite U / Tamulaitiene G
Funding supportLithuania, 1 items
OrganizationGrant numberCountry
Research Council of LithuaniaS-MIP-19-32Lithuania
CitationJournal: Mol Cell / Year: 2026
Title: Structural insights into Cas9-mediated prespacer selection in CRISPR-Cas adaptation.
Authors: Ugne Gaizauskaite / Giedre Tamulaitiene / Arunas Silanskas / Giedrius Gasiunas / Virginijus Siksnys / Giedrius Sasnauskas
Abstract: During CRISPR-Cas adaptation, prokaryotic cells become immunized by the insertion of foreign DNA fragments, termed spacers, into the host genome to serve as templates for RNA-guided immunity. Spacer ...During CRISPR-Cas adaptation, prokaryotic cells become immunized by the insertion of foreign DNA fragments, termed spacers, into the host genome to serve as templates for RNA-guided immunity. Spacer acquisition relies on the Cas1-Cas2 integrase and accessory proteins, which select DNA sequences flanked by the protospacer adjacent motif (PAM) and insert them into the CRISPR array. It has been shown that in type II-A systems, selection of PAM-proximal prespacers is mediated by the effector nuclease Cas9, which forms a "supercomplex" with the Cas1-Cas2 integrase and the Csn2 protein. Here, we present cryo-electron microscopy structures of the Streptococcus thermophilus type II-A prespacer selection supercomplex in the DNA-scanning and two distinct PAM-bound configurations, providing insights into the mechanism of Cas9-mediated prespacer selection in type II-A CRISPR-Cas systems. Repurposing Cas9 by the CRISPR adaptation machinery for prespacer selection, as characterized here, demonstrates Cas9 plasticity and expands our knowledge of Cas9 biology.
History
DepositionOct 10, 2024-
Header (metadata) releaseFeb 18, 2026-
Map releaseFeb 18, 2026-
UpdateMar 18, 2026-
Current statusMar 18, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_51787.png

Downloads & links

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Map

FileDownload / File: emd_51787.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationsharpened map (phenix.auto_sharpen)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesX (Sec.)Y (Row.)Z (Col.)
1.1 Å/pix.
x 200 pix.
= 220. Å		1.1 Å/pix.
x 200 pix.
= 220. Å		1.1 Å/pix.
x 200 pix.
= 220. Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 4.0
Minimum - Maximum-20.731894 - 33.335532999999998
Average (Standard dev.)0.000000000007022 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 220.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_51787_msk_1.map
Projections & Slices
AxesZYX

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Histogram

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Additional map: unsharpened map, input to phenix.auto sharpen (3.33A, b iso to d cut)

Fileemd_51787_additional_1.map
Annotationunsharpened map, input to phenix.auto_sharpen (3.33A, b_iso_to_d_cut)
Projections & Slices
AxesZYX

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Histogram

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Half map: half map 1

Fileemd_51787_half_map_1.map
Annotationhalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: half map 2

Fileemd_51787_half_map_2.map
Annotationhalf map 2
Projections & Slices
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Sample components

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Entire : Cas9:tracrRNA:crRNA complex

EntireName: Cas9:tracrRNA:crRNA complex
Components
  • Complex: Cas9:tracrRNA:crRNA complex
    • Protein or peptide: CRISPR-associated endonuclease Cas9
    • RNA: crRNA (5'-R(P*GP*AP*AP*GP*AP*GP*GP*AP*CP*AP*GP*UP*UP*UP*UP*AP*GP*AP*GP*CP*UP*G)-3')
    • RNA: tracrRNA (62-MER)
  • Ligand: CALCIUM ION

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Supramolecule #1: Cas9:tracrRNA:crRNA complex

SupramoleculeName: Cas9:tracrRNA:crRNA complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Streptococcus thermophilus DGCC 7710 (bacteria)

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Macromolecule #1: CRISPR-associated endonuclease Cas9

MacromoleculeName: CRISPR-associated endonuclease Cas9 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: Hydrolases; Acting on ester bonds
Source (natural)Organism: Streptococcus thermophilus DGCC 7710 (bacteria)
Molecular weightTheoretical: 162.498531 KDa
Recombinant expressionOrganism: Escherichia coli str. K-12 substr. DH10B (bacteria)
SequenceString: MTKPYSIGLD IGTNSVGWAV ITDNYKVPSK KMKVLGNTSK KYIKKNLLGV LLFDSGITAE GRRLKRTARR RYTRRRNRIL YLQEIFSTE MATLDDAFFQ RLDDSFLVPD DKRDSKYPIF GNLVEEKVYH DEFPTIYHLR KYLADSTKKA DLRLVYLALA H MIKYRGHF ...String:
MTKPYSIGLD IGTNSVGWAV ITDNYKVPSK KMKVLGNTSK KYIKKNLLGV LLFDSGITAE GRRLKRTARR RYTRRRNRIL YLQEIFSTE MATLDDAFFQ RLDDSFLVPD DKRDSKYPIF GNLVEEKVYH DEFPTIYHLR KYLADSTKKA DLRLVYLALA H MIKYRGHF LIEGEFNSKN NDIQKNFQDF LDTYNAIFES DLSLENSKQL EEIVKDKISK LEKKDRILKL FPGEKNSGIF SE FLKLIVG NQADFRKCFN LDEKASLHFS KESYDEDLET LLGYIGDDYS DVFLKAKKLY DAILLSGFLT VTDNETEAPL SSA MIKRYN EHKEDLALLK EYIRNISLKT YNEVFKDDTK NGYAGYIDGK TNQEDFYVYL KNLLAEFEGA DYFLEKIDRE DFLR KQRTF DNGSIPYQIH LQEMRAILDK QAKFYPFLAK NKERIEKILT FRIPYYVGPL ARGNSDFAWS IRKRNEKITP WNFED VIDK ESSAEAFINR MTSFDLYLPE EKVLPKHSLL YETFNVYNEL TKVRFIAESM RDYQFLDSKQ KKDIVRLYFK DKRKVT DKD IIEYLHAIYG YDGIELKGIE KQFNSSLSTY HDLLNIINDK EFLDDSSNEA IIEEIIHTLT IFEDREMIKQ RLSKFEN IF DKSVLKKLSR RHYTGWGKLS AKLINGIRDE KSGNTILDYL IDDGISNRNF MQLIHDDALS FKKKIQKAQI IGDEDKGN I KEVVKSLPGS PAIKKGILQS IKIVDELVKV MGGRKPESIV VEMARENQYT NQGKSNSQQR LKRLEKSLKE LGSKILKEN IPAKLSKIDN NALQNDRLYL YYLQNGKDMY TGDDLDIDRL SNYDIDHIIP QAFLKDNSID NKVLVSSASN RGKSDDFPSL EVVKKRKTF WYQLLKSKLI SQRKFDNLTK AERGGLLPED KAGFIQRQLV ETRQITKHVA RLLDEKFNNK KDENNRAVRT V KIITLKST LVSQFRKDFE LYKVREINDF HHAHDAYLNA VIASALLKKY PKLEPEFVYG DYPKYNSFRE RKSATEKVYF YS NIMNIFK KSISLADGRV IERPLIEVNE ETGESVWNKE SDLATVRRVL SYPQVNVVKK VEEQNHGLDR GKPKGLFNAN LSS KPKPNS NENLVGAKEY LDPKKYGGYA GISNSFAVLV KGTIEKGAKK KITNVLEFQG ISILDRINYR KDKLNFLLEK GYKD IELII ELPKYSLFEL SDGSRRMLAS ILSTNNKRGE IHKGNQIFLS QKFVKLLYHA KRISNTINEN HRKYVENHKK EFEEL FYYI LEFNENYVGA KKNGKLLNSA FQSWQNHSID ELCSSFIGPT GSERKGLFEL TSRGSAADFE FLGVKIPRYR DYTPSS LLK DATLIHQSVT GLYETRIDLA KLGEGLEGHH HHHH

UniProtKB: CRISPR-associated endonuclease Cas9

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Macromolecule #2: crRNA (5'-R(P*GP*AP*AP*GP*AP*GP*GP*AP*CP*AP*GP*UP*UP*UP*UP*AP*GP*...

MacromoleculeName: crRNA (5'-R(P*GP*AP*AP*GP*AP*GP*GP*AP*CP*AP*GP*UP*UP*UP*UP*AP*GP*AP*GP*CP*UP*G)-3')
type: rna / ID: 2 / Number of copies: 1
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 13.609083 KDa
SequenceString:
CGCUAAAGAG GAAGAGGACA GUUUUAGAGC UGUGUUGUUU CG

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Macromolecule #3: tracrRNA (62-MER)

MacromoleculeName: tracrRNA (62-MER) / type: rna / ID: 3 / Number of copies: 1
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 24.119357 KDa
SequenceString:
CGAAACAACA CAGCGAGUUA AAAUAAGGCU UAGUCCGUAC UCAACUUGAA AAGGUGGCAC CGAUUCGGUG UUUUU

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Macromolecule #4: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 4 / Number of copies: 1 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS GLACIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number real images: 1551 / Average exposure time: 46.33 sec. / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 92000
Sample stageCooling holder cryogen: NITROGEN

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Image processing

Particle selectionNumber selected: 860841
CTF correctionType: NONE
Startup modelType of model: INSILICO MODEL / In silico model: cryoSPARC ab-initio
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.33 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.4.1) / Number images used: 108160
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelChain - Chain ID: A / Chain - Source name: AlphaFold / Chain - Initial model type: in silico model
Output model

PDB-9h21:
Cas9 in complex with tracrRNA and crRNA, Streptococcus thermophilus DGCC 7710 CRISPR3 system

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