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- EMDB-8558: Negative stain reconstruction of Cas1-Cas2/3 complex of type I-F ... -
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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-8558 | |||||||||
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Title | Negative stain reconstruction of Cas1-Cas2/3 complex of type I-F CRISPR system from Pseudomonas aeruginosa (PA14) | |||||||||
![]() | Negative stain reconstruction of Pseudomonas aeruginosa (PA14) Cas1-Cas2/3 complex | |||||||||
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Function / homology | ![]() maintenance of CRISPR repeat elements / helicase activity / DNA endonuclease activity / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / defense response to virus / Hydrolases; Acting on ester bonds / hydrolase activity / DNA binding / ATP binding / identical protein binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / negative staining / Resolution: 15.6 Å | |||||||||
![]() | Chowdhury S / Lander GC / Rollins MF / Carter J / Golden MS / Wilkinson RA / Bondy-Denomy J / Wiedenheft B | |||||||||
![]() | ![]() Title: Cas1 and the Csy complex are opposing regulators of Cas2/3 nuclease activity. Authors: MaryClare F Rollins / Saikat Chowdhury / Joshua Carter / Sarah M Golden / Royce A Wilkinson / Joseph Bondy-Denomy / Gabriel C Lander / Blake Wiedenheft / ![]() Abstract: The type I-F CRISPR adaptive immune system in (PA14) consists of two CRISPR loci and six CRISPR-associated () genes. Type I-F systems rely on a CRISPR RNA (crRNA)-guided surveillance complex (Csy ...The type I-F CRISPR adaptive immune system in (PA14) consists of two CRISPR loci and six CRISPR-associated () genes. Type I-F systems rely on a CRISPR RNA (crRNA)-guided surveillance complex (Csy complex) to bind foreign DNA and recruit a -acting nuclease (i.e., Cas2/3) for target degradation. In most type I systems, Cas2 and Cas3 are separate proteins involved in adaptation and interference, respectively. However, in I-F systems, these proteins are fused into a single polypeptide. Here we use biochemical and structural methods to show that two molecules of Cas2/3 assemble with four molecules of Cas1 (Cas2/3:Cas1) into a four-lobed propeller-shaped structure, where the two Cas2 domains form a central hub (twofold axis of symmetry) flanked by two Cas1 lobes and two Cas3 lobes. We show that the Cas1 subunits repress Cas2/3 nuclease activity and that foreign DNA recognition by the Csy complex activates Cas2/3, resulting in bidirectional degradation of DNA targets. Collectively, this work provides a structure of the Cas1-2/3 complex and explains how Cas1 and the target-bound Csy complex play opposing roles in the regulation of Cas2/3 nuclease activity. | |||||||||
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 | ![]() | 2.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 13.5 KB 13.5 KB | Display Display | ![]() |
Images | ![]() | 46.8 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 79 KB | Display | ![]() |
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Full document | ![]() | 78.1 KB | Display | |
Data in XML | ![]() | 494 B | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Similar structure data |
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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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Annotation | Negative stain reconstruction of Pseudomonas aeruginosa (PA14) Cas1-Cas2/3 complex | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 4.1 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 : Complex containing dimer of Cas2/3 protein and tetramer of Cas1 p...
Entire | Name: Complex containing dimer of Cas2/3 protein and tetramer of Cas1 protein. |
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Components |
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-Supramolecule #1: Complex containing dimer of Cas2/3 protein and tetramer of Cas1 p...
Supramolecule | Name: Complex containing dimer of Cas2/3 protein and tetramer of Cas1 protein. type: complex / ID: 1 / Parent: 0 |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() ![]() |
Molecular weight | Theoretical: 386 KDa |
-Experimental details
-Structure determination
Method | negative staining |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.03 mg/mL |
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Buffer | pH: 7.5 / Details: 20 mM HEPES, 150 mM KCl |
Staining | Type: NEGATIVE / Material: Uranyl Formate Details: Sample absorbed on carbon surface was stained with 2% (w/v) Uranyl Formate solution, and finally air-dried after blotting off excess stain. |
Grid | Model: 400 mesh Cu-Rh maxtaform grids (Electron Microscopy Sciences) that were coated with a thin layer of amorphous carbon. Material: COPPER/RHODIUM / Mesh: 400 / Support film - Material: CARBON / Support film - topology: CONTINUOUS / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.02 kPa / Details: 15mA current |
Details | Mono dispersed protein solution |
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Electron microscopy
Microscope | FEI TECNAI SPIRIT |
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Temperature | Min: 293.0 K / Max: 295.0 K |
Image recording | Film or detector model: TVIPS TEMCAM-F416 (4k x 4k) / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Digitization - Sampling interval: 15.6 µm / Number grids imaged: 1 / Number real images: 1159 / Average exposure time: 0.479 sec. / Average electron dose: 30.0 e/Å2 |
Electron beam | Acceleration voltage: 120 kV / Electron source: LAB6 |
Electron optics | C2 aperture diameter: 100.0 µm / Calibrated defocus max: 0.99 µm / Calibrated defocus min: 0.99 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 52000 |
Sample stage | Specimen holder model: SIDE ENTRY, EUCENTRIC / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Tecnai Spirit / Image courtesy: FEI Company |