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- EMDB-29878: Exploiting Activation and Inactivation Mechanisms in Type I-C CRI... -
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Open data
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Basic information
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Title | Exploiting Activation and Inactivation Mechanisms in Type I-C CRISPR-Cas3 for Genome Editing Applications | |||||||||
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Function / homology | ![]() maintenance of CRISPR repeat elements / ![]() ![]() ![]() Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Hu C / Nam KH / Ke A | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Exploiting activation and inactivation mechanisms in type I-C CRISPR-Cas3 for genome-editing applications. Authors: Chunyi Hu / Mason T Myers / Xufei Zhou / Zhonggang Hou / Macy L Lozen / Ki Hyun Nam / Yan Zhang / Ailong Ke / ![]() ![]() ![]() Abstract: Type I CRISPR-Cas systems utilize the RNA-guided Cascade complex to identify matching DNA targets and the nuclease-helicase Cas3 to degrade them. Among the seven subtypes, type I-C is compact in size ...Type I CRISPR-Cas systems utilize the RNA-guided Cascade complex to identify matching DNA targets and the nuclease-helicase Cas3 to degrade them. Among the seven subtypes, type I-C is compact in size and highly active in creating large-sized genome deletions in human cells. Here, we use four cryoelectron microscopy snapshots to define its RNA-guided DNA binding and cleavage mechanisms in high resolution. The non-target DNA strand (NTS) is accommodated by I-C Cascade in a continuous binding groove along the juxtaposed Cas11 subunits. Binding of Cas3 further traps a flexible bulge in NTS, enabling NTS nicking. We identified two anti-CRISPR proteins AcrIC8 and AcrIC9 that strongly inhibit Neisseria lactamica I-C function. Structural analysis showed that AcrIC8 inhibits PAM recognition through allosteric inhibition, whereas AcrIC9 achieves so through direct competition. Both Acrs potently inhibit I-C-mediated genome editing and transcriptional modulation in human cells, providing the first off-switches for type I CRISPR eukaryotic genome engineering. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.5 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.3 KB 24.3 KB | Display Display | ![]() |
Images | ![]() | 138.1 KB | ||
Filedesc metadata | ![]() | 6.9 KB | ||
Others | ![]() ![]() ![]() | 32.5 MB 59.5 MB 59.5 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8g9tMC ![]() 8g9sC ![]() 8g9uC ![]() 8gafC ![]() 8gamC ![]() 8ganC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.489 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Additional map: #1
File | emd_29878_additional_1.map | ||||||||||||
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Density Histograms |
-Half map: #2
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_29878_half_map_2.map | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Binary complex of AcrIC9 with crRNA bound type I-C Cascade
Entire | Name: Binary complex of AcrIC9 with crRNA bound type I-C Cascade |
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Components |
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-Supramolecule #1: Binary complex of AcrIC9 with crRNA bound type I-C Cascade
Supramolecule | Name: Binary complex of AcrIC9 with crRNA bound type I-C Cascade type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 400 KDa |
-Macromolecule #1: AcrIC9
Macromolecule | Name: AcrIC9 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 8.247822 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: MTSFYKITAY NSQALYFWGT DADVDRYVDW LNRDREINVY AAEAIPEAEW AQYEGRDDVL SGEECGWDDF UniProtKB: Uncharacterized protein |
-Macromolecule #2: Cas7
Macromolecule | Name: Cas7 / type: protein_or_peptide / ID: 2 / Number of copies: 7 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 32.208111 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: TIEKRYDFVF LFDVQDGNPN GDPDAGNLPR IDPQTGEGLV TDVCLKRKVR NFIQMTQNDE HHDIFIREKG ILNNLIDEAH EQENVKGKE KGEKTEAARQ YMCSRYYDIR TFGAVMTTGK NAGQVRGPVQ LTFSRSIDPI MTLEHSITRM AVTNEKDASE T GDNRTMGR ...String: TIEKRYDFVF LFDVQDGNPN GDPDAGNLPR IDPQTGEGLV TDVCLKRKVR NFIQMTQNDE HHDIFIREKG ILNNLIDEAH EQENVKGKE KGEKTEAARQ YMCSRYYDIR TFGAVMTTGK NAGQVRGPVQ LTFSRSIDPI MTLEHSITRM AVTNEKDASE T GDNRTMGR KFTVPYGLYR CHGFISTHFA KQTGFSENDL ELFWQALVNM FDHDHSAARG QMNARGLYVF EHSNNLGDAP AD SLFKRIQ VVKKDGVEVV RSFDDYLVSV DDKNLEETKL LRKLGG UniProtKB: ![]() |
-Macromolecule #3: Cas11
Macromolecule | Name: Cas11 / type: protein_or_peptide / ID: 3 / Number of copies: 4 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 14.245184 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: GLDRNRQDIG YVLGRLFAVL EKIQAEANPG LNATIADRYF GSASSTPIAV FGTLMRLLPH HLNKLEFEGR AVQLQWEIRQ ILEHCQRFP NHLNLEQQGL FAIGYYHETQ FLFTKDALKN LFNEA UniProtKB: ![]() |
-Macromolecule #4: Cas8
Macromolecule | Name: Cas8 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 64.860832 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: MILHALTQYY QRKAESDGGI AQEGFENKEI PFIIVIDKQG NFIQLEDTRE LKVKKKVGRT FLVPKGLGRS GSKSYEVSNL LWDHYGYVL AYAGEKGQEQ ADKQHASFTA KVNELKQALP DDAGVTAVAA FLSSAEEKSK VMQAANWAEC AKVKGCNLSF R LVDEAVDL ...String: MILHALTQYY QRKAESDGGI AQEGFENKEI PFIIVIDKQG NFIQLEDTRE LKVKKKVGRT FLVPKGLGRS GSKSYEVSNL LWDHYGYVL AYAGEKGQEQ ADKQHASFTA KVNELKQALP DDAGVTAVAA FLSSAEEKSK VMQAANWAEC AKVKGCNLSF R LVDEAVDL VCQSKAVREY VSQANQTQSD NAQKGICLVT GKAAPIARLH NAVKGVNAKP APFASVNLSA FESYGKEQGF AF PIGEQAM FEYTTALNTL LAGENRFRIG DVTTVCWGAK RTPLEESLAS MINGGGKDKP DEHIDAVKTL YKSLYNGQYQ KPD GKEKFY LLGLSPNSAR IVVRFWHETT VAALSESIAA WYDDLQMVRG ENSPYPEYMP LPRLLGNLVL DGKMENLPSD LIAQ ITDAA LNNRVLPVSL LQAALRRNKA EQKITYGRAS LLKAYINRAI RAGRLKNMKE LTMGLDRNRQ DIGYVLGRLF AVLEK IQAE ANPGLNATIA DRYFGSASST PIAVFGTLMR LLPHHLNKLE FEGRAVQLQW EIRQILEHCQ RFPNHLNLEQ QGLFAI GYY HETQFLFTKD ALKNLFNEA UniProtKB: ![]() |
-Macromolecule #5: Cas5
Macromolecule | Name: Cas5 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 23.870451 KDa |
Recombinant expression | Organism: ![]() ![]() ![]() |
Sequence | String: RFILEISGDL ACFTRSELKV ERVSYPVITP SAARNILMAI LWKPAIRWKV LKIEILKPIQ WTNIRRNEVG TKMSERSGSL YIEDNRQQR ASMLLKDVAY RIHADFDMTS EAGESDNYVK FAEMFKRRAK KGQYFHQPYL GCREFPCDFR LLEKAEDGLP L EDITQDFG ...String: RFILEISGDL ACFTRSELKV ERVSYPVITP SAARNILMAI LWKPAIRWKV LKIEILKPIQ WTNIRRNEVG TKMSERSGSL YIEDNRQQR ASMLLKDVAY RIHADFDMTS EAGESDNYVK FAEMFKRRAK KGQYFHQPYL GCREFPCDFR LLEKAEDGLP L EDITQDFG FMLYDMDFSK SDPRDSNNAE PMFYQCKAVN GVITVPP UniProtKB: pre-crRNA processing endonuclease |
-Macromolecule #6: crRNA (43-MER)
Macromolecule | Name: crRNA (43-MER) / type: rna / ID: 6 / Number of copies: 1 |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 13.870306 KDa |
Sequence | String: GAAACAGGGU CAGCUUGCCG UAGGUGGCAU CGCCCUCGUA AAA |
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Concentration | 1 mg/mL |
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Buffer | pH: 7.5 / Component - Concentration: 150.0 mM / Component - Formula: NaCl![]() ![]() |
Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 278 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Calibrated defocus max: 3.0 µm / Calibrated defocus min: 1.5 µm / Illumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION![]() |
Specialist optics | Energy filter - Name: GIF Bioquantum |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Temperature | Min: 70.0 K / Max: 100.0 K |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1200 / Number real images: 1200 / Average exposure time: 2.5 sec. / Average electron dose: 50.0 e/Å2 |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: NONE |
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Initial angle assignment | Type: NOT APPLICABLE |
Final 3D classification | Number classes: 6 / Software - Name: cryoSPARC |
Final angle assignment | Type: NOT APPLICABLE |
Final reconstruction | Number classes used: 6 / Resolution.type: BY AUTHOR / Resolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 200000 |
-Atomic model buiding 1
Refinement | Protocol: RIGID BODY FIT |
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Output model | ![]() PDB-8g9t: |