8FF4

Cryo-EM structure of Cascade-DNA-TniQ-TnsC complex (composite) in type I-B CAST system


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 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

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-B CRISPR-associated protein Cas5212Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: cas5
UniProt
Find proteins for A0A235IG00 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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UniProt GroupA0A235IG00
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-B CRISPR-associated protein Cas6220Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: cas6
UniProt
Find proteins for A0A235IH92 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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UniProt GroupA0A235IH92
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-B CRISPR-associated protein Cas7
C, D, E, F, G
C, D, E, F, G, H
323Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_09080
UniProt
Find proteins for A0A235IG15 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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UniProt GroupA0A235IG15
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-B CRISPR-associated protein Cas8534Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_09085
UniProt
Find proteins for A0A235IGR9 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-B CRISPR-associated protein Cas11
J, K, L
138Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_09085
UniProt
Find proteins for A0A235IGR9 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
TniQ329Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_09005
UniProt
Find proteins for A0A235IFP5 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
TnsC
Q, R, S, T, U
Q, R, S, T, U, V, W
383Nostoc sp. 'Peltigera membranacea cyanobiont' 210AMutation(s): 0 
Gene Names: CDG76_08990
UniProt
Find proteins for A0A235IFM2 (Nostoc sp. 'Peltigera membranacea cyanobiont' 210A)
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Entity ID: 6
MoleculeChains LengthOrganismImage
RNA71synthetic construct
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Entity ID: 7
MoleculeChains LengthOrganismImage
Target DNA strand85synthetic construct
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Entity ID: 8
MoleculeChains LengthOrganismImage
Non-target DNA strand85synthetic construct
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Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP (Subject of Investigation/LOI)
Query on ATP

Download Ideal Coordinates CCD File 
BA [auth S]
DA [auth T]
FA [auth U]
HA [auth V]
JA [auth W]
BA [auth S],
DA [auth T],
FA [auth U],
HA [auth V],
JA [auth W],
X [auth Q],
Z [auth R]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
AA [auth R]
CA [auth S]
EA [auth T]
GA [auth U]
IA [auth V]
AA [auth R],
CA [auth S],
EA [auth T],
GA [auth U],
IA [auth V],
KA [auth W],
Y [auth Q]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 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 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