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© Structural Dynamics Of Macromolecules
The structure of a bacterial analog of the nicotinic receptor (one color per subunit) inserted into the cell membrane (grey and orange). A representation of the volume accessible to ions is shown in yellow.
Publication : EMBO J.

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

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in EMBO J. - 01 Feb 2002

Delarue M, Boulé JB, Lescar J, Expert-Bezançon N, Jourdan N, Sukumar N, Rougeon F, Papanicolaou C.

Link to Pubmed [PMID] – 11823435

Link to HAL – Click here

Link to DOI – 10.1093/emboj/21.3.427

EMBO J. 2002 Feb 1;21(3):427-39.

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.