7ZOQ

Cryo-EM structure of a CRISPR effector in complex with a caspase regulator


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into the regulation of Cas7-11 by TPR-CHAT.

Ekundayo, B.Torre, D.Beckert, B.Nazarov, S.Myasnikov, A.Stahlberg, H.Ni, D.

(2023) Nat Struct Mol Biol 30: 135-139

  • DOI: https://doi.org/10.1038/s41594-022-00894-5
  • Primary Citation of Related Structures:  
    7ZOL, 7ZOQ

  • PubMed Abstract: 

    The CRISPR-guided caspase (Craspase) complex is an assembly of the target-specific RNA nuclease known as Cas7-11 bound to CRISPR RNA (crRNA) and an ancillary protein known as TPR-CHAT (tetratricopeptide repeats (TPR) fused with a CHAT domain). The Craspase complex holds promise as a tool for gene therapy and biomedical research, but its regulation is poorly understood. TPR-CHAT regulates Cas7-11 nuclease activity via an unknown mechanism. In the present study, we use cryoelectron microscopy to determine structures of the Desulfonema magnum (Dm) Craspase complex to gain mechanistic insights into its regulation. We show that DmTPR-CHAT stabilizes crRNA-bound DmCas7-11 in a closed conformation via a network of interactions mediated by the DmTPR-CHAT N-terminal domain, the DmCas7-11 insertion finger and Cas11-like domain, resulting in reduced target RNA accessibility and cleavage.


  • Organizational Affiliation

    Laboratory of Biological Electron Microscopy, Institute of Physics, School of Basic Sciences, EPFL, and Department of Fundamental Microbiology, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TPR-CHAT822Desulfonema magnumMutation(s): 0 
UniProt
Find proteins for A0A975BRS1 (Desulfonema magnum)
Explore A0A975BRS1 
Go to UniProtKB:  A0A975BRS1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A975BRS1
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cas7-111,799Desulfonema magnumMutation(s): 0 
UniProt
Find proteins for A0A975GRY4 (Desulfonema magnum)
Explore A0A975GRY4 
Go to UniProtKB:  A0A975GRY4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A975GRY4
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains LengthOrganismImage
RNA (39-MER)39Desulfonema magnum
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerlandSNF Grants CRSII5_177195
Swiss National Science FoundationSwitzerlandNCCR TransCure (185544)

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-30
    Type: Initial release
  • Version 1.1: 2023-03-01
    Changes: Database references