2IRU

Crystal Structure of the Polymerase Domain from Mycobacterium tuberculosis Ligase D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and function of a mycobacterial NHEJ DNA repair polymerase.

Pitcher, R.S.Brissett, N.C.Picher, A.J.Andrade, P.Juarez, R.Thompson, D.Fox, G.C.Blanco, L.Doherty, A.J.

(2007) J Mol Biol 366: 391-405

  • DOI: 10.1016/j.jmb.2006.10.046
  • Primary Citation of Related Structures:  
    2IRY, 2IRX, 2IRU

  • PubMed Abstract: 
  • Non homologous end-joining (NHEJ)-mediated repair of DNA double-strand breaks in prokaryotes requires Ku and a specific multidomain DNA ligase (LigD). We present crystal structures of the primase/polymerisation domain (PolDom) of Mycobacterium tuberculos ...

    Non homologous end-joining (NHEJ)-mediated repair of DNA double-strand breaks in prokaryotes requires Ku and a specific multidomain DNA ligase (LigD). We present crystal structures of the primase/polymerisation domain (PolDom) of Mycobacterium tuberculosis LigD, alone and complexed with nucleotides. The PolDom structure combines the general fold of the archaeo-eukaryotic primase (AEP) superfamily with additional loops and domains that together form a deep cleft on the surface, likely used for DNA binding. Enzymatic analysis indicates that the PolDom of LigD, even in the absence of accessory domains and Ku proteins, has the potential to recognise DNA end-joining intermediates. Strikingly, one of the main signals for the specific and efficient binding of PolDom to DNA is the presence of a 5'-phosphate group, located at the single/double-stranded junction at both gapped and 3'-protruding DNA molecules. Although structurally unrelated, Pol lambda and Pol mu, the two eukaryotic DNA polymerases involved in NHEJ, are endowed with a similar capacity to bind a 5'-phosphate group. Other properties that are beneficial for NHEJ, such as the ability to generate template distortions and realignments of the primer, displayed by Pol lambda and Pol mu, are shared by the PolDom of bacterial LigD. In addition, PolDom can perform non-mutagenic translesion synthesis on termini containing modified bases. Significantly, ribonucleotide insertion appears to be a recurrent theme associated with NHEJ, maximised in this case by the deployment of a dedicated primase, although its in vivo relevance is unknown.


    Organizational Affiliation

    Genome Damage and Stability Centre, University of Sussex, Brighton BN1 9RQ, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative DNA ligase-like protein Rv0938/MT0965 AB303Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: Rv098ligDRv0938MTCY08D9.01cMTCY10D7.36c
EC: 2.7.7 (PDB Primary Data), 6.5.1.1 (UniProt)
Find proteins for P9WNV3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WNV3 
Go to UniProtKB:  P9WNV3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.053α = 90
b = 75.796β = 92.68
c = 96.1γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
MOSFLMdata reduction
CCP4data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-01-02
    Type: Initial release
  • Version 1.1: 2007-10-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Source and taxonomy, Version format compliance