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- PDB-7y84: CryoEM structure of type III-E CRISPR Craspase gRAMP-crRNA in com... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7y84 | ||||||
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Title | CryoEM structure of type III-E CRISPR Craspase gRAMP-crRNA in complex with TPR-CHAT protease | ||||||
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![]() | STRUCTURAL PROTEIN/RNA / Nuclease / STRUCTURAL PROTEIN-RNA COMPLEX | ||||||
Function / homology | ![]() | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.61 Å | ||||||
![]() | Zhang, J.T. / Cui, N. / Huang, H.D. / Jia, N. | ||||||
Funding support | 1items
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![]() | ![]() Title: Structural basis for the non-self RNA-activated protease activity of the type III-E CRISPR nuclease-protease Craspase. Authors: Ning Cui / Jun-Tao Zhang / Zhuolin Li / Xiao-Yu Liu / Chongyuan Wang / Hongda Huang / Ning Jia / ![]() Abstract: The RNA-targeting type III-E CRISPR-gRAMP effector interacts with a caspase-like protease TPR-CHAT to form the CRISPR-guided caspase complex (Craspase), but their functional mechanism is unknown. ...The RNA-targeting type III-E CRISPR-gRAMP effector interacts with a caspase-like protease TPR-CHAT to form the CRISPR-guided caspase complex (Craspase), but their functional mechanism is unknown. Here, we report cryo-EM structures of the type III-E gRAMP and gRAMP-TPR-CHAT complexes, before and after either self or non-self RNA target binding, and elucidate the mechanisms underlying RNA-targeting and non-self RNA-induced protease activation. The associated TPR-CHAT adopted a distinct conformation upon self versus non-self RNA target binding, with nucleotides at positions -1 and -2 of the CRISPR-derived RNA (crRNA) serving as a sensor. Only binding of the non-self RNA target activated the TPR-CHAT protease, leading to cleavage of Csx30 protein. Furthermore, TPR-CHAT structurally resembled eukaryotic separase, but with a distinct mechanism for protease regulation. Our findings should facilitate the development of gRAMP-based RNA manipulation tools, and advance our understanding of the virus-host discrimination process governed by a nuclease-protease Craspase during type III-E CRISPR-Cas immunity. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 424.4 KB | Display | ![]() |
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PDB format | ![]() | 327.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 62.8 KB | Display | |
Data in CIF | ![]() | 94 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 33680MC ![]() 7y80C ![]() 7y81C ![]() 7y82C ![]() 7y83C ![]() 7y85C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 198652.688 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||||
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#2: RNA chain | Mass: 35432.090 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||||
#3: Protein | Mass: 85523.141 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||||
#4: Chemical | ChemComp-ZN / #5: Chemical | ChemComp-MG / | Has ligand of interest | Y | |
-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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Source (natural) |
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Source (recombinant) |
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Buffer solution | pH: 8 | ||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
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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 / Nominal defocus max: 2500 nm / Nominal defocus min: 1500 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING ONLY |
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3D reconstruction | Resolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 611350 / Symmetry type: POINT |