7U5E

I-F3b Cascade-TniQ partial R-loop complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.03 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Multiple adaptations underly co-option of a CRISPR surveillance complex for RNA-guided DNA transposition.

Park, J.U.Petassi, M.T.Hsieh, S.C.Mehrotra, E.Schuler, G.Budhathoki, J.Truong, V.H.Thyme, S.B.Ke, A.Kellogg, E.H.Peters, J.E.

(2023) Mol Cell 83: 1827-1838.e6

  • DOI: https://doi.org/10.1016/j.molcel.2023.05.005
  • Primary Citation of Related Structures:  
    7U5D, 7U5E

  • PubMed Abstract: 

    CRISPR-associated transposons (CASTs) are natural RNA-directed transposition systems. We demonstrate that transposon protein TniQ plays a central role in promoting R-loop formation by RNA-guided DNA-targeting modules. TniQ residues, proximal to CRISPR RNA (crRNA), are required for recognizing different crRNA categories, revealing an unappreciated role of TniQ to direct transposition into different classes of crRNA targets. To investigate adaptations allowing CAST elements to utilize attachment sites inaccessible to CRISPR-Cas surveillance complexes, we compared and contrasted PAM sequence requirements in both I-F3b CAST and I-F1 CRISPR-Cas systems. We identify specific amino acids that enable a wider range of PAM sequences to be accommodated in I-F3b CAST elements compared with I-F1 CRISPR-Cas, enabling CAST elements to access attachment sites as sequences drift and evade host surveillance. Together, this evidence points to the central role of TniQ in facilitating the acquisition of CRISPR effector complexes for RNA-guided DNA transposition.


  • Organizational Affiliation

    Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14853, USA.


Macromolecules

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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Cas8/5D [auth A]704Aeromonas salmonicidaMutation(s): 0 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Cas7347Aeromonas salmonicidaMutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
Cas6K [auth H]206Aeromonas salmonicidaMutation(s): 0 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
TniQL [auth I],
M [auth J]
410Aeromonas salmonicidaMutation(s): 0 
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Entity ID: 1
MoleculeChains LengthOrganismImage
crRNAA [auth 1]60Aeromonas salmonicida
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Entity ID: 2
MoleculeChains LengthOrganismImage
Target strand DNAB [auth 2]116Aeromonas salmonicida
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Entity ID: 3
MoleculeChains LengthOrganismImage
Non-target strand DNAC [auth 3]116Aeromonas salmonicida
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.03 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTCoot
MODEL REFINEMENTRosettaEM
MODEL REFINEMENTPHENIX

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 StatesR00-GM124463
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01-GM144566

Revision History  (Full details and data files)

  • Version 1.0: 2023-06-14
    Type: Initial release
  • Version 1.1: 2024-06-12
    Changes: Data collection, Refinement description