8FCW

Cryo-EM structure of TnsC-DNA complex in type I-B CAST system


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.87 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

Molecular mechanism for Tn7-like transposon recruitment by a type I-B CRISPR effector.

Wang, S.Gabel, C.Siddique, R.Klose, T.Chang, L.

(2023) Cell 186: 4204-4215.e19

  • DOI: https://doi.org/10.1016/j.cell.2023.07.010
  • Primary Citation of Related Structures:  
    8FCJ, 8FCU, 8FCV, 8FCW, 8FCX, 8FD2, 8FD3, 8FF4, 8FF5

  • PubMed Abstract: 

    Tn7-like transposons have co-opted CRISPR-Cas systems to facilitate the movement of their own DNA. These CRISPR-associated transposons (CASTs) are promising tools for programmable gene knockin. A key feature of CASTs is their ability to recruit Tn7-like transposons to nuclease-deficient CRISPR effectors. However, how Tn7-like transposons are recruited by diverse CRISPR effectors remains poorly understood. Here, we present the cryo-EM structure of a recruitment complex comprising the Cascade complex, TniQ, TnsC, and the target DNA in the type I-B CAST from Peltigera membranacea cyanobiont 210A. Target DNA recognition by Cascade induces conformational changes in Cas6 and primes TniQ recruitment through its C-terminal domain. The N-terminal domain of TniQ is bound to the seam region of the TnsC spiral heptamer. Our findings provide insights into the diverse mechanisms for the recruitment of Tn7-like transposons to CRISPR effectors and will aid in the development of CASTs as gene knockin tools.


  • Organizational Affiliation

    Department of Biological Sciences, Purdue University, West Lafayette, IN 47907, USA.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TnsCA [auth R],
B [auth S],
C [auth T],
D [auth U],
E [auth V]
383Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_08990
UniProt
Find proteins for A0A235IFM2 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
Explore A0A235IFM2 
Go to UniProtKB:  A0A235IFM2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A235IFM2
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (60-MER)F [auth N]60synthetic construct
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (60-MER)G [auth O]60synthetic construct
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
H [auth R],
J [auth S],
L [auth T],
N [auth U],
P [auth V]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
I [auth R],
K [auth S],
M [auth T],
O [auth U],
Q [auth V]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.87 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-09
    Type: Initial release
  • Version 1.1: 2023-08-23
    Changes: Data collection, Database references
  • Version 1.2: 2023-09-27
    Changes: Database references
  • Version 1.3: 2024-01-31
    Changes: Source and taxonomy