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Open data
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Basic information
Entry | Database: PDB / ID: 7qqk | ||||||||||||
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Title | TIR-SAVED effector bound to cA3 | ||||||||||||
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![]() | SIGNALING PROTEIN / Microbacterium ketosireducens TIR SAVED complex bound to cA3 | ||||||||||||
Function / homology | ![]() nucleobase-containing small molecule biosynthetic process / NAD catabolic process / NAD+ nucleosidase activity / signal transduction Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.8 Å | ||||||||||||
![]() | Spagnolo, L. / White, M.F. / Hogrel, G. / Guild, A. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Cyclic nucleotide-induced helical structure activates a TIR immune effector. Authors: Gaëlle Hogrel / Abbie Guild / Shirley Graham / Hannah Rickman / Sabine Grüschow / Quentin Bertrand / Laura Spagnolo / Malcolm F White / ![]() ![]() ![]() Abstract: Cyclic nucleotide signalling is a key component of antiviral defence in all domains of life. Viral detection activates a nucleotide cyclase to generate a second messenger, resulting in activation of ...Cyclic nucleotide signalling is a key component of antiviral defence in all domains of life. Viral detection activates a nucleotide cyclase to generate a second messenger, resulting in activation of effector proteins. This is exemplified by the metazoan cGAS-STING innate immunity pathway, which originated in bacteria. These defence systems require a sensor domain to bind the cyclic nucleotide and are often coupled with an effector domain that, when activated, causes cell death by destroying essential biomolecules. One example is the Toll/interleukin-1 receptor (TIR) domain, which degrades the essential cofactor NAD when activated in response to infection in plants and bacteria or during programmed nerve cell death. Here we show that a bacterial antiviral defence system generates a cyclic tri-adenylate that binds to a TIR-SAVED effector, acting as the 'glue' to allow assembly of an extended superhelical solenoid structure. Adjacent TIR subunits interact to organize and complete a composite active site, allowing NAD degradation. Activation requires extended filament formation, both in vitro and in vivo. Our study highlights an example of large-scale molecular assembly controlled by cyclic nucleotides and reveals key details of the mechanism of TIR enzyme activation. | ||||||||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 293.2 KB | Display | ![]() |
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PDB format | ![]() | 241.5 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 14122MC 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: 46815.875 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() Gene: RS81_00402 / Production host: ![]() ![]() #2: RNA chain | Mass: 942.660 Da / Num. of mol.: 4 / Source method: obtained synthetically / Source: (synth.) ![]() |
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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
Component | Name: one tier of TIR_SAVED bound to cA3 / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Microscopy | Model: JEOL CRYO ARM 300 |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 5000 nm / Nominal defocus min: 1500 nm |
Image recording | Electron dose: 46 e/Å2 / Film or detector model: DIRECT ELECTRON DE-64 (8k x 8k) |
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Processing
Software | Name: PHENIX / Version: 1.19.2_4158: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 596378 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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