1KEJ

Crystal Structure of Murine Terminal Deoxynucleotidyl Transferase complexed with ddATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.263 

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

  • Primary Citation of Related Structures:  1JMS, 1KDH

  • 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 complex ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Terminal deoxynucleotidyltransferase short isoform
A
363Mus musculusGene Names: Dntt (Tdt)
EC: 2.7.7.31
Find proteins for P09838 (Mus musculus)
Go to UniProtKB:  P09838
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
DAD
Query on DAD

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

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Download CCD File 
A
COBALT (II) ION
Co
XLJKHNWPARRRJB-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.263 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 46.900α = 90.00
b = 85.300β = 90.00
c = 108.300γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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