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Yorodumi- EMDB-28993: Cryo-EM structure of Cascade-DNA-TniQ-TnsC complex in type I-B CA... -
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Open data
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Basic information
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| Title | Cryo-EM structure of Cascade-DNA-TniQ-TnsC complex in type I-B CAST system | |||||||||
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Keywords | CRISPR / DNA recognition / DNA BINDING PROTEIN | |||||||||
| Function / homology | Function and homology information | |||||||||
| Biological species | Peltigera membranacea (fungus) / Nostoc sp. 'Peltigera membranacea cyanobiont' 210A (bacteria) / synthetic construct (others) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 3.19 Å | |||||||||
Authors | Chang L / Wang S | |||||||||
| Funding support | United States, 1 items
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Citation | Journal: Cell / Year: 2023Title: Molecular mechanism for Tn7-like transposon recruitment by a type I-B CRISPR effector. Authors: Shukun Wang / Clinton Gabel / Romana Siddique / Thomas Klose / Leifu Chang / ![]() Abstract: Tn7-like transposons have co-opted CRISPR-Cas systems to facilitate the movement of their own DNA. These CRISPR-associated transposons (CASTs) are promising tools for programmable gene knockin. A key ...Tn7-like transposons have co-opted CRISPR-Cas systems to facilitate the movement of their own DNA. These CRISPR-associated transposons (CASTs) are promising tools for programmable gene knockin. A key feature of CASTs is their ability to recruit Tn7-like transposons to nuclease-deficient CRISPR effectors. However, how Tn7-like transposons are recruited by diverse CRISPR effectors remains poorly understood. Here, we present the cryo-EM structure of a recruitment complex comprising the Cascade complex, TniQ, TnsC, and the target DNA in the type I-B CAST from Peltigera membranacea cyanobiont 210A. Target DNA recognition by Cascade induces conformational changes in Cas6 and primes TniQ recruitment through its C-terminal domain. The N-terminal domain of TniQ is bound to the seam region of the TnsC spiral heptamer. Our findings provide insights into the diverse mechanisms for the recruitment of Tn7-like transposons to CRISPR effectors and will aid in the development of CASTs as gene knockin tools. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_28993.map.gz | 16.5 MB | EMDB map data format | |
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| Header (meta data) | emd-28993-v30.xml emd-28993.xml | 24.8 KB 24.8 KB | Display Display | EMDB header |
| Images | emd_28993.png | 134.6 KB | ||
| Filedesc metadata | emd-28993.cif.gz | 7.3 KB | ||
| Others | emd_28993_half_map_1.map.gz emd_28993_half_map_2.map.gz | 200.2 MB 200.2 MB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-28993 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-28993 | HTTPS FTP |
-Validation report
| Summary document | emd_28993_validation.pdf.gz | 714.2 KB | Display | EMDB validaton report |
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| Full document | emd_28993_full_validation.pdf.gz | 713.8 KB | Display | |
| Data in XML | emd_28993_validation.xml.gz | 16 KB | Display | |
| Data in CIF | emd_28993_validation.cif.gz | 19 KB | Display | |
| Arichive directory | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-28993 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-28993 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 8fcuMC ![]() 8fcjC ![]() 8fcvC ![]() 8fcwC ![]() 8fcxC ![]() 8fd2C ![]() 8fd3C ![]() 8ff4C ![]() 8ff5C M: atomic model generated by this map C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_28993.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1.054 Å | ||||||||||||||||||||||||||||||||||||
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
-Half map: #2
| File | emd_28993_half_map_1.map | ||||||||||||
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| Density Histograms |
-Half map: #1
| File | emd_28993_half_map_2.map | ||||||||||||
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| Density Histograms |
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Sample components
+Entire : Cascade-DNA-TniQ-TnsC complex
+Supramolecule #1: Cascade-DNA-TniQ-TnsC complex
+Macromolecule #1: Type I-B CRISPR-associated protein Cas5
+Macromolecule #2: Type I-B CRISPR-associated protein Cas6
+Macromolecule #3: Type I-B CRISPR-associated protein Cas7
+Macromolecule #4: Type I-MYXAN CRISPR-associated Cas8a1/Cmx1
+Macromolecule #5: Type I-B CRISPR-associated protein Cas11
+Macromolecule #9: TniQ
+Macromolecule #10: TnsC
+Macromolecule #6: RNA
+Macromolecule #7: Target DNA strand
+Macromolecule #8: Non-target DNA strand
+Macromolecule #11: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #12: MAGNESIUM ION
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Buffer | pH: 7.5 |
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| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | FEI TITAN KRIOS |
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| Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 54.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
| Startup model | Type of model: PDB ENTRY PDB model - PDB ID: |
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| Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 96534 |
| Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
| Final angle assignment | Type: MAXIMUM LIKELIHOOD |
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About Yorodumi



Keywords
Peltigera membranacea (fungus)
Nostoc sp. 'Peltigera membranacea cyanobiont' 210A (bacteria)
Authors
United States, 1 items
Citation

















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FIELD EMISSION GUN
