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- EMDB-5737: Structure of an RNA silencing complex of the CRISPR-Cas immune system -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-5737 | |||||||||
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Title | Structure of an RNA silencing complex of the CRISPR-Cas immune system | |||||||||
![]() | Helical reconstruction of the Cmr4-Cmr5 filament | |||||||||
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![]() | Helical filament | |||||||||
Function / homology | ![]() endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / RNA binding / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 16.0 Å | |||||||||
![]() | Spilman MS / Cocozaki AI / Hale C / Shao Y / Ramia NF / Terns R / Terns M / Li H / Stagg SM | |||||||||
![]() | ![]() Title: Structure of an RNA silencing complex of the CRISPR-Cas immune system. Authors: Michael Spilman / Alexis Cocozaki / Caryn Hale / Yaming Shao / Nancy Ramia / Rebeca Terns / Michael Terns / Hong Li / Scott Stagg / ![]() Abstract: Bacterial and archaeal clustered regularly interspaced short palindromic repeat (CRISPR) loci capture virus and plasmid sequences and use them to recognize and eliminate these invaders. CRISPR RNAs ...Bacterial and archaeal clustered regularly interspaced short palindromic repeat (CRISPR) loci capture virus and plasmid sequences and use them to recognize and eliminate these invaders. CRISPR RNAs (crRNAs) containing the acquired sequences are incorporated into effector complexes that destroy matching invader nucleic acids. The multicomponent Cmr effector complex cleaves RNA targets complementary to the crRNAs. Here, we report cryoelectron microscopy reconstruction of a functional Cmr complex bound with a target RNA at ~12 Å. Pairs of the Cmr4 and Cmr5 proteins form a helical core that is asymmetrically capped on each end by distinct pairs of the four remaining subunits: Cmr2 and Cmr3 at the conserved 5' crRNA tag sequence and Cmr1 and Cmr6 near the 3' end of the crRNA. The shape and organization of the RNA-targeting Cmr complex is strikingly similar to the DNA-targeting Cascade complex. Our results reveal a remarkably conserved architecture among very distantly related CRISPR-Cas complexes. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 460.1 KB | ![]() | |
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Header (meta data) | ![]() ![]() | 10.3 KB 10.3 KB | Display Display | ![]() |
Images | ![]() | 65.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | Helical reconstruction of the Cmr4-Cmr5 filament | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 2.78 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Cmr4-Cmr5 filament
Entire | Name: Cmr4-Cmr5 filament |
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Components |
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-Supramolecule #1000: Cmr4-Cmr5 filament
Supramolecule | Name: Cmr4-Cmr5 filament / type: sample / ID: 1000 / Oligomeric state: helical filament / Number unique components: 2 |
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Molecular weight | Theoretical: 520 KDa |
-Macromolecule #1: Cmr4
Macromolecule | Name: Cmr4 / type: protein_or_peptide / ID: 1 / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | UniProtKB: CRISPR system Cmr endoribonuclease Cmr4 |
-Macromolecule #2: Cmr5
Macromolecule | Name: Cmr5 / type: protein_or_peptide / ID: 2 / Recombinant expression: Yes |
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Source (natural) | Organism: ![]() ![]() |
Recombinant expression | Organism: ![]() ![]() |
Sequence | UniProtKB: CRISPR system Cmr subunit Cmr5 |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | filament |
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Sample preparation
Concentration | 2 mg/mL |
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Buffer | pH: 7.5 / Details: 20 mM Tris-HCl, 100 mM NaCl |
Grid | Details: C-flat 2/2 400 mesh holey carbon grid |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 93 K / Instrument: FEI VITROBOT MARK IV Method: Plasma clean grids for 5 seconds, apply 3 uL sample, and blot for 4 seconds before plunging. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Temperature | Average: 94 K |
Alignment procedure | Legacy - Astigmatism: Objective lens astigmatism was corrected at 120,000 times magnification |
Date | Sep 10, 2012 |
Image recording | Category: CCD / Film or detector model: GATAN ULTRASCAN 4000 (4k x 4k) / Number real images: 268 / Average electron dose: 15 e/Å2 |
Electron beam | Acceleration voltage: 120 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 5.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 59000 |
Sample stage | Specimen holder: Nitrogen cooled / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Details | Helical reconstruction used IHRSR software package combined with EMAN and in-house software |
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Final reconstruction | Applied symmetry - Helical parameters - Δz: 29.3 Å Applied symmetry - Helical parameters - Δ&Phi: 48 ° Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 16.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EMAN, IHRSR |
CTF correction | Details: Phase flip each particle |