7MCS

Cryo-electron microscopy structure of TnsC(1-503)A225V bound to DNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.56 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for DNA targeting by the Tn7 transposon.

Shen, Y.Gomez-Blanco, J.Petassi, M.T.Peters, J.E.Ortega, J.Guarne, A.

(2022) Nat Struct Mol Biol 29: 143-151

  • DOI: https://doi.org/10.1038/s41594-022-00724-8
  • Primary Citation of Related Structures:  
    7MBW, 7MCS

  • PubMed Abstract: 

    Tn7 transposable elements are unique for their highly specific, and sometimes programmable, target-site selection mechanisms and precise insertions. All the elements in the Tn7 family utilize an AAA+ adaptor (TnsC) to coordinate target-site selection with transpososome assembly and to prevent insertions at sites already containing a Tn7 element. Owing to its multiple functions, TnsC is considered the linchpin in the Tn7 element. Here we present the high-resolution cryo-EM structure of TnsC bound to DNA using a gain-of-function variant of the protein and a DNA substrate that together recapitulate the recruitment to a specific DNA target site. TnsC forms an asymmetric ring on target DNA that segregates target-site selection and interaction with the paired-end complex to opposite faces of the ring. Unlike most AAA+ ATPases, TnsC uses a DNA distortion to find the target site but does not remodel DNA to activate transposition. By recognizing pre-distorted substrates, TnsC creates a built-in regulatory mechanism where ATP hydrolysis abolishes ring formation proximal to an existing element. This work unveils how Tn7 and Tn7-like elements determine the strict spacing between the target and integration sites.


  • Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, Quebec, Canada.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transposon Tn7 transposition protein TnsC
A, B, C, D, E
A, B, C, D, E, F, G
523Escherichia coliMutation(s): 2 
Gene Names: tnsC
UniProt
Find proteins for P05846 (Escherichia coli)
Explore P05846 
Go to UniProtKB:  P05846
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05846
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(P*CP*GP*CP*GP*CP*GP*CP*GP*CP*GP*CP*GP*CP*GP*C)-3')15synthetic construct
Sequence Annotations
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  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(P*GP*CP*GP*CP*GP*CP*GP*CP*GP*CP*GP*CP*GP*CP*G)-3')15synthetic construct
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ANP (Subject of Investigation/LOI)
Query on ANP

Download Ideal Coordinates CCD File 
J [auth B]
L [auth C]
N [auth D]
P [auth E]
R [auth F]
J [auth B],
L [auth C],
N [auth D],
P [auth E],
R [auth F],
T [auth G]
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER
C10 H17 N6 O12 P3
PVKSNHVPLWYQGJ-KQYNXXCUSA-N
MG (Subject of Investigation/LOI)
Query on MG

Download Ideal Coordinates CCD File 
K [auth B]
M [auth C]
O [auth D]
Q [auth E]
S [auth F]
K [auth B],
M [auth C],
O [auth D],
Q [auth E],
S [auth F],
U [auth G]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.56 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaPJT-155941

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-23
    Type: Initial release
  • Version 1.1: 2022-03-02
    Changes: Database references
  • Version 1.2: 2024-05-29
    Changes: Data collection