8DFS

type I-C Cascade bound to AcrIF2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural snapshots of R-loop formation by a type I-C CRISPR Cascade.

O'Brien, R.E.Bravo, J.P.K.Ramos, D.Hibshman, G.N.Wright, J.T.Taylor, D.W.

(2023) Mol Cell 83: 746

  • DOI: https://doi.org/10.1016/j.molcel.2023.01.024
  • Primary Citation of Related Structures:  
    8DEJ, 8DEX, 8DFA, 8DFO, 8DFS

  • PubMed Abstract: 

    Type I CRISPR-Cas systems employ multi-subunit Cascade effector complexes to target foreign nucleic acids for destruction. Here, we present structures of D. vulgaris type I-C Cascade at various stages of double-stranded (ds)DNA target capture, revealing mechanisms that underpin PAM recognition and Cascade allosteric activation. We uncover an interesting mechanism of non-target strand (NTS) DNA stabilization via stacking interactions with the "belly" subunits, securing the NTS in place. This "molecular seatbelt" mechanism facilitates efficient R-loop formation and prevents dsDNA reannealing. Additionally, we provide structural insights into how two anti-CRISPR (Acr) proteins utilize distinct strategies to achieve a shared mechanism of type I-C Cascade inhibition by blocking PAM scanning. These observations form a structural basis for directional R-loop formation and reveal how different Acr proteins have converged upon common molecular mechanisms to efficiently shut down CRISPR immunity.


  • Organizational Affiliation

    Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
pre-crRNA processing endonuclease227Nitratidesulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0130
EC: 3.1
UniProt
Find proteins for Q72WF9 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF9 
Go to UniProtKB:  Q72WF9
Entity Groups  
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UniProt GroupQ72WF9
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein, TM1801 family
B, C, D, E, F
B, C, D, E, F, G, H
290Nitratidesulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0132
UniProt
Find proteins for Q72WF7 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF7 
Go to UniProtKB:  Q72WF7
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UniProt GroupQ72WF7
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein, CT1133 family612Nitratidesulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0131
UniProt
Find proteins for Q72WF8 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF8 
Go to UniProtKB:  Q72WF8
Entity Groups  
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UniProt GroupQ72WF8
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein, CT1133 family
J, K
124Nitratidesulfovibrio vulgaris str. HildenboroughMutation(s): 0 
Gene Names: DVUA0131
UniProt
Find proteins for Q72WF8 (Desulfovibrio vulgaris (strain ATCC 29579 / DSM 644 / NCIMB 8303 / VKM B-1760 / Hildenborough))
Explore Q72WF8 
Go to UniProtKB:  Q72WF8
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UniProt GroupQ72WF8
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Anti-CRISPR protein 3090Casadabanvirus D3112Mutation(s): 0 
Gene Names: orf30
UniProt
Find proteins for Q6TM72 (Pseudomonas phage D3112)
Explore Q6TM72 
Go to UniProtKB:  Q6TM72
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UniProt GroupQ6TM72
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Entity ID: 5
MoleculeChains LengthOrganismImage
RNA (48-MER)48Nitratidesulfovibrio vulgaris str. Hildenborough
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM138348
Cancer Prevention and Research Institute of Texas (CPRIT)United StatesRR160088

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-22
    Type: Initial release
  • Version 1.1: 2023-03-01
    Changes: Database references
  • Version 1.2: 2023-03-08
    Changes: Database references
  • Version 1.3: 2023-03-15
    Changes: Database references