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- EMDB-14494: SpCas9 bound to 8-nucleotide complementary DNA substrate -

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Basic information

Entry
Database: EMDB / ID: EMD-14494
TitleSpCas9 bound to 8-nucleotide complementary DNA substrate
Map data
Sample
  • Complex: Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complementary DNA substrate
    • Protein or peptide: CRISPR-associated endonuclease Cas9/Csn1
    • RNA: sgRNASubgenomic mRNA
    • DNA: Target strand of 8 nucleotide complementary DNA substrate
    • DNA: Non-target strand of 8 nucleotide complementary DNA substrate
Function / homology
Function and homology information


maintenance of CRISPR repeat elements / 3'-5' exonuclease activity / DNA endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / DNA binding / RNA binding / metal ion binding
Similarity search - Function
CRISPR-associated endonuclease Cas9, PAM-interacting domain / CRISPR-associated endonuclease Cas9, bridge helix / CRISPR-associated endonuclease Cas9, REC lobe / REC lobe of CRISPR-associated endonuclease Cas9 / Bridge helix of CRISPR-associated endonuclease Cas9 / PAM-interacting domain of CRISPR-associated endonuclease Cas9 / CRISPR-associated endonuclease Cas9 / HNH endonuclease / Cas9-type HNH domain / Cas9-type HNH domain profile. ...CRISPR-associated endonuclease Cas9, PAM-interacting domain / CRISPR-associated endonuclease Cas9, bridge helix / CRISPR-associated endonuclease Cas9, REC lobe / REC lobe of CRISPR-associated endonuclease Cas9 / Bridge helix of CRISPR-associated endonuclease Cas9 / PAM-interacting domain of CRISPR-associated endonuclease Cas9 / CRISPR-associated endonuclease Cas9 / HNH endonuclease / Cas9-type HNH domain / Cas9-type HNH domain profile. / HNH nuclease / Ribonuclease H superfamily
Similarity search - Domain/homology
CRISPR-associated endonuclease Cas9/Csn1
Similarity search - Component
Biological speciesStreptococcus pyogenes (bacteria) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.14 Å
AuthorsPacesa M / Jinek M
Funding support Switzerland, 1 items
OrganizationGrant numberCountry
Swiss National Science Foundation31003A_182567 Switzerland
CitationJournal: Nature / Year: 2022
Title: R-loop formation and conformational activation mechanisms of Cas9.
Authors: Martin Pacesa / Luuk Loeff / Irma Querques / Lena M Muckenfuss / Marta Sawicka / Martin Jinek /
Abstract: Cas9 is a CRISPR-associated endonuclease capable of RNA-guided, site-specific DNA cleavage. The programmable activity of Cas9 has been widely utilized for genome editing applications, yet its precise ...Cas9 is a CRISPR-associated endonuclease capable of RNA-guided, site-specific DNA cleavage. The programmable activity of Cas9 has been widely utilized for genome editing applications, yet its precise mechanisms of target DNA binding and off-target discrimination remain incompletely understood. Here we report a series of cryo-electron microscopy structures of Streptococcus pyogenes Cas9 capturing the directional process of target DNA hybridization. In the early phase of R-loop formation, the Cas9 REC2 and REC3 domains form a positively charged cleft that accommodates the distal end of the target DNA duplex. Guide-target hybridization past the seed region induces rearrangements of the REC2 and REC3 domains and relocation of the HNH nuclease domain to assume a catalytically incompetent checkpoint conformation. Completion of the guide-target heteroduplex triggers conformational activation of the HNH nuclease domain, enabled by distortion of the guide-target heteroduplex, and complementary REC2 and REC3 domain rearrangements. Together, these results establish a structural framework for target DNA-dependent activation of Cas9 that sheds light on its conformational checkpoint mechanism and may facilitate the development of novel Cas9 variants and guide RNA designs with enhanced specificity and activity.
History
DepositionMar 3, 2022-
Header (metadata) releaseAug 31, 2022-
Map releaseAug 31, 2022-
UpdateSep 14, 2022-
Current statusSep 14, 2022Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_14494.png

Downloads & links

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Map

FileDownload / File: emd_14494.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.65 Å/pix.
x 384 pix.
= 249.6 Å		0.65 Å/pix.
x 384 pix.
= 249.6 Å		0.65 Å/pix.
x 384 pix.
= 249.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.65 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.1
Minimum - Maximum-0.15982264 - 0.49750304
Average (Standard dev.)0.0025867922 (±0.018155325)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 249.59999 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_14494_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_14494_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 : Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complemen...

EntireName: Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complementary DNA substrate
Components
  • Complex: Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complementary DNA substrate
    • Protein or peptide: CRISPR-associated endonuclease Cas9/Csn1
    • RNA: sgRNASubgenomic mRNA
    • DNA: Target strand of 8 nucleotide complementary DNA substrate
    • DNA: Non-target strand of 8 nucleotide complementary DNA substrate

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Supramolecule #1: Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complemen...

SupramoleculeName: Ternary complex of SpCas9-sgRNA bound to a 8 nucleotide complementary DNA substrate
type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Streptococcus pyogenes (bacteria)
Recombinant expressionOrganism: Escherichia coli (E. coli)

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Macromolecule #1: CRISPR-associated endonuclease Cas9/Csn1

MacromoleculeName: CRISPR-associated endonuclease Cas9/Csn1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: Hydrolases; Acting on ester bonds
Source (natural)Organism: Streptococcus pyogenes (bacteria)
Molecular weightTheoretical: 158.588781 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MDKKYSIGLA IGTNSVGWAV ITDEYKVPSK KFKVLGNTDR HSIKKNLIGA LLFDSGETAE ATRLKRTARR RYTRRKNRIC YLQEIFSNE MAKVDDSFFH RLEESFLVEE DKKHERHPIF GNIVDEVAYH EKYPTIYHLR KKLVDSTDKA DLRLIYLALA H MIKFRGHF ...String:
MDKKYSIGLA IGTNSVGWAV ITDEYKVPSK KFKVLGNTDR HSIKKNLIGA LLFDSGETAE ATRLKRTARR RYTRRKNRIC YLQEIFSNE MAKVDDSFFH RLEESFLVEE DKKHERHPIF GNIVDEVAYH EKYPTIYHLR KKLVDSTDKA DLRLIYLALA H MIKFRGHF LIEGDLNPDN SDVDKLFIQL VQTYNQLFEE NPINASGVDA KAILSARLSK SRRLENLIAQ LPGEKKNGLF GN LIALSLG LTPNFKSNFD LAEDAKLQLS KDTYDDDLDN LLAQIGDQYA DLFLAAKNLS DAILLSDILR VNTEITKAPL SAS MIKRYD EHHQDLTLLK ALVRQQLPEK YKEIFFDQSK NGYAGYIDGG ASQEEFYKFI KPILEKMDGT EELLVKLNRE DLLR KQRTF DNGSIPHQIH LGELHAILRR QEDFYPFLKD NREKIEKILT FRIPYYVGPL ARGNSRFAWM TRKSEETITP WNFEE VVDK GASAQSFIER MTNFDKNLPN EKVLPKHSLL YEYFTVYNEL TKVKYVTEGM RKPAFLSGEQ KKAIVDLLFK TNRKVT VKQ LKEDYFKKIE CFDSVEISGV EDRFNASLGT YHDLLKIIKD KDFLDNEENE DILEDIVLTL TLFEDREMIE ERLKTYA HL FDDKVMKQLK RRRYTGWGRL SRKLINGIRD KQSGKTILDF LKSDGFANRN FMQLIHDDSL TFKEDIQKAQ VSGQGDSL H EHIANLAGSP AIKKGILQTV KVVDELVKVM GRHKPENIVI EMARENQTTQ KGQKNSRERM KRIEEGIKEL GSQILKEHP VENTQLQNEK LYLYYLQNGR DMYVDQELDI NRLSDYDVDA IVPQSFLKDD SIDNKVLTRS DKNRGKSDNV PSEEVVKKMK NYWRQLLNA KLITQRKFDN LTKAERGGLS ELDKAGFIKR QLVETRQITK HVAQILDSRM NTKYDENDKL IREVKVITLK S KLVSDFRK DFQFYKVREI NNYHHAHDAY LNAVVGTALI KKYPKLESEF VYGDYKVYDV RKMIAKSEQE IGKATAKYFF YS NIMNFFK TEITLANGEI RKRPLIETNG ETGEIVWDKG RDFATVRKVL SMPQVNIVKK TEVQTGGFSK ESILPKRNSD KLI ARKKDW DPKKYGGFDS PTVAYSVLVV AKVEKGKSKK LKSVKELLGI TIMERSSFEK NPIDFLEAKG YKEVKKDLII KLPK YSLFE LENGRKRMLA SAGELQKGNE LALPSKYVNF LYLASHYEKL KGSPEDNEQK QLFVEQHKHY LDEIIEQISE FSKRV ILAD ANLDKVLSAY NKHRDKPIRE QAENIIHLFT LTNLGAPAAF KYFDTTIDRK RYTSTKEVLD ATLIHQSITG LYETRI DLS QLGGD

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Macromolecule #2: sgRNA

MacromoleculeName: sgRNA / type: rna / ID: 2 / Number of copies: 1
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 33.005641 KDa
SequenceString:
GGGACGCAUA AAGAUGAGAC GCGUUUUAGA GCUAGAAAUA GCAAGUUAAA AUAAGGCUAG UCCGUUAUCA ACUUGAAAAA GUGGCACCG AGUCGGUGCU UUU

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Macromolecule #3: Target strand of 8 nucleotide complementary DNA substrate

MacromoleculeName: Target strand of 8 nucleotide complementary DNA substrate
type: dna / ID: 3 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 9.182928 KDa
SequenceString:
(DC)(DG)(DT)(DG)(DA)(DT)(DT)(DC)(DC)(DA) (DG)(DC)(DG)(DT)(DC)(DT)(DC)(DA)(DA)(DA) (DG)(DT)(DC)(DT)(DA)(DC)(DA)(DT)(DA) (DG)

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Macromolecule #4: Non-target strand of 8 nucleotide complementary DNA substrate

MacromoleculeName: Non-target strand of 8 nucleotide complementary DNA substrate
type: dna / ID: 4 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 9.211963 KDa
SequenceString:
(DC)(DT)(DA)(DT)(DG)(DT)(DA)(DG)(DA)(DC) (DT)(DT)(DA)(DC)(DT)(DA)(DT)(DT)(DA)(DT) (DT)(DG)(DG)(DA)(DA)(DT)(DC)(DA)(DC) (DG)

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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-PROPANE / Chamber humidity: 100 % / Chamber temperature: 293.15 K

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 µm
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 64.23 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

5fq5

Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.14 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 147231
FSC plot (resolution estimation)

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