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Open data
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Basic information
Entry | Database: PDB / ID: 7xsq | ||||||
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Title | Structure of the Craspase | ||||||
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![]() | IMMUNE SYSTEM/RNA / IMMUNE SYSTEM-RNA complex | ||||||
Function / homology | ![]() | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.88 Å | ||||||
![]() | Feng, Y. / Zhang, L. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Target RNA activates the protease activity of Craspase to confer antiviral defense. Authors: Xi Liu / Laixing Zhang / Hao Wang / Yu Xiu / Ling Huang / Zhengyu Gao / Ningning Li / Feixue Li / Weijia Xiong / Teng Gao / Yi Zhang / Maojun Yang / Yue Feng / ![]() Abstract: In the type III-E CRISPR-Cas system, a Cas effector (gRAMP) is associated with a TPR-CHAT to form Craspase (CRISPR-guided caspase). However, both the structural features of gRAMP and the immunity ...In the type III-E CRISPR-Cas system, a Cas effector (gRAMP) is associated with a TPR-CHAT to form Craspase (CRISPR-guided caspase). However, both the structural features of gRAMP and the immunity mechanism remain unknown for this system. Here, we report structures of gRAMP-crRNA and gRAMP:cRNA:target RNA as well as structures of Craspase and Craspase complexed with cognate target RNA (CTR) or non-cognate target RNA (NTR). Importantly, the 3' anti-tag region of NTR and CTR binds at two distinct channels in Craspase, and CTR with a non-complementary 3' anti-tag induces a marked conformational change of the TPR-CHAT, which allosterically activates its protease activity to cleave an ancillary protein Csx30. This cleavage then triggers an abortive infection as the antiviral strategy of the type III-E system. Together, our study provides crucial insights into both the catalytic mechanism of the gRAMP and the immunity mechanism of the type III-E system. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 388.5 KB | Display | ![]() |
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PDB format | ![]() | 301.5 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 | ![]() | 62.5 KB | Display | |
Data in CIF | ![]() | 97.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 33431MC ![]() 7xsoC ![]() 7xspC ![]() 7xsrC ![]() 7xssC ![]() 7xt4C 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: 197823.797 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: Using a different transcription start point, the protein has additional five residues in its N-terminus. Source: (gene. exp.) ![]() ![]() ![]() | ||
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#2: Protein | Mass: 82549.992 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||
#3: RNA chain | Mass: 23741.119 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() | ||
#4: Chemical | ChemComp-ZN / 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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Buffer solution | pH: 7 | ||||||||||||||||||||||||
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: DARK FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1700 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.17.1_3660: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 2.88 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 229997 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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