1KEJ

Crystal Structure of Murine Terminal Deoxynucleotidyl Transferase complexed with ddATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.269 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 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 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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Terminal deoxynucleotidyltransferase short isoformA363Mus musculusMutation(s): 0 
Gene Names: DnttTdt
EC: 2.7.7.31 (PDB Primary Data), 3.1.11 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P09838 (Mus musculus)
Explore P09838 
Go to UniProtKB:  P09838
IMPC:  MGI:98659
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DAD
Query on DAD

Download Ideal Coordinates CCD File 
E [auth A]2',3'-DIDEOXYADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O11 P3
OAKPWEUQDVLTCN-RQJHMYQMSA-N
 Ligand Interaction
CO
Query on CO

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.263 
  • R-Value Observed: 0.269 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.9α = 90
b = 85.3β = 90
c = 108.3γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-05-16
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance