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- PDB-5xlp: Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex wi... -
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Open data
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Basic information
Entry | Database: PDB / ID: 5xlp | ||||||
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Title | Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex with a 20nt spacer crRNA backbone region | ||||||
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![]() | IMMUNE SYSTEM/RNA / anti-CRISPR proteins / Csy complex / Type I-F CRISPR/Cas system / IMMUNE SYSTEM-RNA complex | ||||||
Function / homology | : / Anti-CRISPR protein Acr30-35/AcrF1 / CRISPR-associated protein Csy3 / CRISPR-associated protein (Cas_Csy3) / defense response to virus / RNA / RNA (> 10) / Uncharacterized protein / CRISPR-associated protein Csy3![]() | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.2 Å | ||||||
![]() | Peng, R. / Shi, Y. / Gao, G.F. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Alternate binding modes of anti-CRISPR viral suppressors AcrF1/2 to Csy surveillance complex revealed by cryo-EM structures. Authors: Ruchao Peng / Ying Xu / Tengfei Zhu / Ningning Li / Jianxun Qi / Yan Chai / Min Wu / Xinzheng Zhang / Yi Shi / Peiyi Wang / Jiawei Wang / Ning Gao / George Fu Gao / ![]() ![]() ![]() Abstract: Bacteriophages encode anti-CRISPR suppressors to counteract the CRISPR/Cas immunity of their bacterial hosts, thus facilitating their survival and replication. Previous studies have shown that two ...Bacteriophages encode anti-CRISPR suppressors to counteract the CRISPR/Cas immunity of their bacterial hosts, thus facilitating their survival and replication. Previous studies have shown that two phage-encoded anti-CRISPR proteins, AcrF1 and AcrF2, suppress the type I-F CRISPR/Cas system of Pseudomonas aeruginosa by preventing target DNA recognition by the Csy surveillance complex, but the precise underlying mechanism was unknown. Here we present the structure of AcrF1/2 bound to the Csy complex determined by cryo-EM single-particle reconstruction. By structural analysis, we found that AcrF1 inhibits target DNA recognition of the Csy complex by interfering with base pairing between the DNA target strand and crRNA spacer. In addition, multiple copies of AcrF1 bind to the Csy complex with different modes when working individually or cooperating with AcrF2, which might exclude target DNA binding through different mechanisms. Together with previous reports, we provide a comprehensive working scenario for the two anti-CRISPR suppressors, AcrF1 and AcrF2, which silence CRISPR/Cas immunity by targeting the Csy surveillance complex. | ||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 237.4 KB | Display | ![]() |
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PDB format | ![]() | 184.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 6731MC ![]() 6728C ![]() 6729C ![]() 6730C ![]() 5xloC 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: 37579.273 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Strain: UCBPP-PA14 / Gene: csy3, csy1-3, PA14_33310 Production host: ![]() ![]() Strain (production host): BL21-Gold(DE3)pLysS AG / References: UniProt: Q02MM1 #2: RNA chain | | Mass: 15456.173 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Production host: ![]() ![]() Strain (production host): BL21-Gold(DE3)pLysS AG #3: Protein | | Mass: 8824.931 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Production host: ![]() ![]() Strain (production host): BL21-Gold(DE3)pLysS AG / References: UniProt: L7P7M1 |
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-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
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Molecular weight | Value: 0.3 MDa / Experimental value: YES | ||||||||||||||||||||||||||||||
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Source (recombinant) |
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||
Specimen | Conc.: 0.7 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
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 / Cs: 2.7 mm |
Image recording | Average exposure time: 0.35 sec. / Electron dose: 1.55 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
Image scans | Movie frames/image: 38 |
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Processing
Software | Name: PHENIX / Version: 1.11.1_2575: / Classification: refinement | ||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: NONE | ||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 154095 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: FLEXIBLE FIT / Space: REAL | ||||||||||||||||||||||||||||||||||||
Refine LS restraints |
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