2HTF

The solution structure of the BRCT domain from human polymerase reveals homology with the TdT BRCT domain


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of polymerase mu's BRCT Domain reveals an element essential for its role in nonhomologous end joining.

DeRose, E.F.Clarkson, M.W.Gilmore, S.A.Galban, C.J.Tripathy, A.Havener, J.M.Mueller, G.A.Ramsden, D.A.London, R.E.Lee, A.L.

(2007) Biochemistry 46: 12100-12110

  • DOI: 10.1021/bi7007728

  • PubMed Abstract: 
  • The solution structure and dynamics of the BRCT domain from human DNA polymerase mu, implicated in repair of chromosome breaks by nonhomologous end joining (NHEJ), has been determined using NMR methods. BRCT domains are typically involved in protein- ...

    The solution structure and dynamics of the BRCT domain from human DNA polymerase mu, implicated in repair of chromosome breaks by nonhomologous end joining (NHEJ), has been determined using NMR methods. BRCT domains are typically involved in protein-protein interactions between factors required for the cellular response to DNA damage. The pol mu BRCT domain is atypical in that, unlike other reported BRCT structures, the pol mu BRCT is neither part of a tandem grouping, nor does it appear to form stable homodimers. Although the sequence of the pol mu BRCT domain has some unique characteristics, particularly the presence of >10% proline residues, it forms the characteristic alphabetaalpha sandwich, in which three alpha helices are arrayed around a central four-stranded beta-sheet. The structure of helix alpha1 is characterized by two solvent-exposed hydrophobic residues, F46 and L50, suggesting that this element may play a role in mediating interactions of pol mu with other proteins. Consistent with this argument, mutation of these residues, as well as the proximal, conserved residue R43, specifically blocked the ability of pol mu to efficiently work together with NHEJ factors Ku and XRCC4-ligase IV to join noncomplementary ends together in vitro. The structural, dynamic, and biochemical evidence reported here identifies a functional surface in the pol mu BRCT domain critical for promoting assembly and activity of the NHEJ machinery. Further, the similarity between the interaction regions of the BRCT domains of pol mu and TdT support the conclusion that they participate in NHEJ as alternate polymerases.


    Organizational Affiliation

    Laboratory of Structural Biology, National Institute of Environmental Health Sciences, 111 T. W. Alexander Drive, Research Triangle Park, North Carolina 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase mu
A
105Homo sapiensMutation(s): 0 
Gene Names: POLM (polmu)
EC: 2.7.7.7
Find proteins for Q9NP87 (Homo sapiens)
Go to Gene View: POLM
Go to UniProtKB:  Q9NP87
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 11 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2HTF Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-02-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance