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- PDB-7kha: Cryo-EM Structure of the Desulfovibrio vulgaris Type I-C Apo Cascade -
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Open data
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Basic information
Entry | Database: PDB / ID: 7kha | |||||||||
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Title | Cryo-EM Structure of the Desulfovibrio vulgaris Type I-C Apo Cascade | |||||||||
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![]() | RNA BINDING PROTEIN/RNA / CRISPR / Cascade / RNA BINDING PROTEIN-RNA complex | |||||||||
Function / homology | ![]() maintenance of CRISPR repeat elements / endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / RNA binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.13 Å | |||||||||
![]() | O'Brien, R. / Wrapp, D. / Bravo, J.P.K. / Schwartz, E. / Taylor, D. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for assembly of non-canonical small subunits into type I-C Cascade. Authors: Roisin E O'Brien / Inês C Santos / Daniel Wrapp / Jack P K Bravo / Evan A Schwartz / Jennifer S Brodbelt / David W Taylor / ![]() Abstract: Bacteria and archaea employ CRISPR (clustered, regularly, interspaced, short palindromic repeats)-Cas (CRISPR-associated) systems as a type of adaptive immunity to target and degrade foreign nucleic ...Bacteria and archaea employ CRISPR (clustered, regularly, interspaced, short palindromic repeats)-Cas (CRISPR-associated) systems as a type of adaptive immunity to target and degrade foreign nucleic acids. While a myriad of CRISPR-Cas systems have been identified to date, type I-C is one of the most commonly found subtypes in nature. Interestingly, the type I-C system employs a minimal Cascade effector complex, which encodes only three unique subunits in its operon. Here, we present a 3.1 Å resolution cryo-EM structure of the Desulfovibrio vulgaris type I-C Cascade, revealing the molecular mechanisms that underlie RNA-directed complex assembly. We demonstrate how this minimal Cascade utilizes previously overlooked, non-canonical small subunits to stabilize R-loop formation. Furthermore, we describe putative PAM and Cas3 binding sites. These findings provide the structural basis for harnessing the type I-C Cascade as a genome-engineering tool. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 511.7 KB | Display | ![]() |
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PDB format | ![]() | 419.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 95.2 KB | Display | |
Data in CIF | ![]() | 143.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22876MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 25250.969 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 / Gene: DVUA0130 / Plasmid: D. vulgaris Cascade/I-C (Cas5c-Cas8c-Cas7)/pHMGWA / Production host: ![]() ![]() | ||||||
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#2: Protein | Mass: 32358.912 Da / Num. of mol.: 7 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 / Gene: DVUA0132 / Plasmid: D. vulgaris Cascade/I-C (Cas5c-Cas8c-Cas7)/pHMGWA / Production host: ![]() ![]() #3: Protein | | Mass: 59310.883 Da / Num. of mol.: 1 / Fragment: UNP residues 80-612 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 / Gene: DVUA0131 / Plasmid: D. vulgaris Cascade/I-C (Cas5c-Cas8c-Cas7)/pHMGWA / Production host: ![]() ![]() #4: Protein | Mass: 14017.981 Da / Num. of mol.: 2 / Fragment: Cas8c C-terminal domain (UNP residues 489-612) Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 / Gene: DVUA0131 / Plasmid: D. vulgaris Cascade/I-C (Cas5c-Cas8c-Cas7)/pHMGWA / Production host: ![]() ![]() #5: RNA chain | | Mass: 14457.629 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 / Plasmid: D. vulgaris sp2 CRISPR/pACYCDuet-1 / Production host: ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Type I-C Apo Cascade / Type: COMPLEX / Details: Minimal CRISPR Cascade / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 0.371 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() Strain: Hildenborough / ATCC 29579 / DSM 644 / NCIMB 8303 |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Conc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER / Grid type: C-flat-2/2 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 33 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5400 |
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Processing
Software | Name: PHENIX / Version: 1.16_3549: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Particle selection | Num. of particles selected: 850000 | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.13 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 156524 / Num. of class averages: 3 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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