TNSA, a catalytic component of the TN7 transposition system

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 

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This is version 1.4 of the entry. See complete history


Unexpected structural diversity in DNA recombination: the restriction endonuclease connection.

Hickman, A.B.Li, Y.Mathew, S.V.May, E.W.Craig, N.L.Dyda, F.

(2000) Mol Cell 5: 1025-1034

  • DOI: https://doi.org/10.1016/s1097-2765(00)80267-1
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Transposition requires a coordinated series of DNA breakage and joining reactions. The Tn7 transposase contains two proteins: TnsA, which carries out DNA breakage at the 5' ends of the transposon, and TnsB, which carries out breakage and joining at the 3' ends of the transposon. TnsB is a member of the retroviral integrase superfamily whose hallmark is a conserved DDE motif. We report here the structure of TnsA at 2.4 A resolution. Surprisingly, the TnsA fold is that of a type II restriction endonuclease. Thus, Tn7 transposition involves a collaboration between polypeptides, one containing a DDE motif and one that does not. This result indicates that the range of biological processes that utilize restriction enzyme-like folds also includes DNA transposition.

  • Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ahickman@helix.nih.gov

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
273Escherichia coliMutation(s): 0 
Find proteins for P13988 (Escherichia coli)
Explore P13988 
Go to UniProtKB:  P13988
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13988
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.35α = 90
b = 83.68β = 94.07
c = 97.94γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations