8B0R

Structure of the CalpL/cA4 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 4.1 of the entry. See complete history


Literature

Antiviral signalling by a cyclic nucleotide activated CRISPR protease.

Rouillon, C.Schneberger, N.Chi, H.Blumenstock, K.Da Vela, S.Ackermann, K.Moecking, J.Peter, M.F.Boenigk, W.Seifert, R.Bode, B.E.Schmid-Burgk, J.L.Svergun, D.Geyer, M.White, M.F.Hagelueken, G.

(2023) Nature 614: 168-174

  • DOI: https://doi.org/10.1038/s41586-022-05571-7
  • Primary Citation of Related Structures:  
    7QDA, 8B0R, 8B0U

  • PubMed Abstract: 

    CRISPR defence systems such as the well-known DNA-targeting Cas9 and the RNA-targeting type III systems are widespread in prokaryotes 1,2 . The latter orchestrates a complex antiviral response that is initiated through the synthesis of cyclic oligoadenylates after recognition of foreign RNA 3-5 . Among the large set of proteins that are linked to type III systems and predicted to bind cyclic oligoadenylates 6,7 , a CRISPR-associated Lon protease (CalpL) stood out to us. CalpL contains a sensor domain of the SAVED family 7 fused to a Lon protease effector domain. However, the mode of action of this effector is unknown. Here we report the structure and function of CalpL and show that this soluble protein forms a stable tripartite complex with two other proteins, CalpT and CalpS, that are encoded on the same operon. After activation by cyclic tetra-adenylate (cA 4 ), CalpL oligomerizes and specifically cleaves the MazF homologue CalpT, which releases the extracytoplasmic function σ factor CalpS from the complex. Our data provide a direct connection between CRISPR-based detection of foreign nucleic acids and transcriptional regulation. Furthermore, the presence of a SAVED domain that binds cyclic tetra-adenylate in a CRISPR effector reveals a link to the cyclic-oligonucleotide-based antiphage signalling system.


  • Organizational Affiliation

    Institute of Structural Biology, University of Bonn, Bonn, Germany. back2crispr@gmail.com.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SMODS-associated and fused to various effectors domain-containing protein499SulfurihydrogenibiumMutation(s): 0 
Gene Names: SYO3AOP1_0656
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains LengthOrganismImage
Cyclic tetraadenosine monophosphate (cA4)4Sulfurihydrogenibium
Sequence Annotations
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  • Reference Sequence
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.487α = 90
b = 69.487β = 90
c = 256.288γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PHENIXrefinement
autoPROCdata reduction
autoPROCdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyHA 6805/6-1

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-16
    Type: Initial release
  • Version 1.1: 2023-01-11
    Changes: Database references
  • Version 1.2: 2023-02-08
    Changes: Database references
  • Version 2.0: 2023-06-28
    Changes: Advisory, Atomic model, Database references, Structure summary
  • Version 2.1: 2023-07-12
    Changes: Structure summary
  • Version 3.0: 2023-08-16
    Changes: Advisory, Atomic model, Data collection, Database references, Polymer sequence, Structure summary
  • Version 3.1: 2023-09-20
    Changes: Structure summary
  • Version 4.0: 2023-12-13
    Changes: Advisory, Atomic model, Database references, Structure summary
  • Version 4.1: 2024-02-07
    Changes: Refinement description