Crystal Structure of the Catalytic Core of Murine Terminal Deoxynucleotidyl Transferase

Experimental Data Snapshot

  • Resolution: 2.36 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.218 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Crystal structures of a template-independent DNA polymerase: murine terminal deoxynucleotidyltransferase.

Delarue, M.Boule, J.B.Lescar, J.Expert-Bezancon, N.Jourdan, N.Sukumar, N.Rougeon, F.Papanicolaou, C.

(2002) EMBO J 21: 427-439

  • DOI: https://doi.org/10.1093/emboj/21.3.427
  • Primary Citation of Related Structures:  
    1JMS, 1KDH, 1KEJ

  • PubMed Abstract: 

    The crystal structure of the catalytic core of murine terminal deoxynucleotidyltransferase (TdT) at 2.35 A resolution reveals a typical DNA polymerase beta-like fold locked in a closed form. In addition, the structures of two different binary complexes, one with an oligonucleotide primer and the other with an incoming ddATP-Co(2+) complex, show that the substrates and the two divalent ions in the catalytic site are positioned in TdT in a manner similar to that described for the human DNA polymerase beta ternary complex, suggesting a common two metal ions mechanism of nucleotidyl transfer in these two proteins. The inability of TdT to accommodate a template strand can be explained by steric hindrance at the catalytic site caused by a long lariat-like loop, which is absent in DNA polymerase beta. However, displacement of this discriminating loop would be sufficient to unmask a number of evolutionarily conserved residues, which could then interact with a template DNA strand. The present structure can be used to model the recently discovered human polymerase mu, with which it shares 43% sequence identity.

  • Organizational Affiliation

    Unité de Biochimie Structurale, URA 2185 du CNRS, Institut Pasteur, 25 rue du Dr Roux, 75015 Paris France. delarue@pasteur.fr

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gene Names: TDT
UniProt & NIH Common Fund Data Resources
Find proteins for P09838 (Mus musculus)
Explore P09838 
Go to UniProtKB:  P09838
IMPC:  MGI:98659
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09838
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.36 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.218 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.1α = 90
b = 85.2β = 90
c = 111.7γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-01-23
    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: 2024-02-07
    Changes: Data collection, Database references, Derived calculations