3MGH

Binary complex of a DNA polymerase lambda loop mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.212 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Loop 1 modulates the fidelity of DNA polymerase lambda

Bebenek, K.Garcia-Diaz, M.Zhou, R.Z.Povirk, L.F.Kunkel, T.A.

(2010) Nucleic Acids Res 38: 5419-5431

  • DOI: 10.1093/nar/gkq261
  • Primary Citation of Related Structures:  
    3MGH, 3MGI

  • PubMed Abstract: 
  • Differences in the substrate specificity of mammalian family X DNA polymerases are proposed to partly depend on a loop (loop 1) upstream of the polymerase active site. To examine if this is the case in DNA polymerase λ (pol λ), here we characterize a ...

    Differences in the substrate specificity of mammalian family X DNA polymerases are proposed to partly depend on a loop (loop 1) upstream of the polymerase active site. To examine if this is the case in DNA polymerase λ (pol λ), here we characterize a variant of the human polymerase in which nine residues of loop 1 are replaced with four residues from the equivalent position in pol β. Crystal structures of the mutant enzyme bound to gapped DNA with and without a correct dNTP reveal that the change in loop 1 does not affect the overall structure of the protein. Consistent with these structural data, the mutant enzyme has relatively normal catalytic efficiency for correct incorporation, and it efficiently participates in non-homologous end joining of double-strand DNA breaks. However, DNA junctions recovered from end-joining reactions are more diverse than normal, and the mutant enzyme is substantially less accurate than wild-type pol λ in three different biochemical assays. Comparisons of the binary and ternary complex crystal structures of mutant and wild-type pol λ suggest that loop 1 modulates pol λ's fidelity by controlling dNTP-induced movements of the template strand and the primer-terminal 3'-OH as the enzyme transitions from an inactive to an active conformation.


    Organizational Affiliation

    Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase lambdaAC329Homo sapiensMutation(s): 0 
Gene Names: POLL
EC: 2.7.7.7 (PDB Primary Data), 4.2.99 (PDB Primary Data)
Find proteins for Q9UGP5 (Homo sapiens)
Explore Q9UGP5 
Go to UniProtKB:  Q9UGP5
NIH Common Fund Data Resources
PHAROS  Q9UGP5
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*CP*GP*GP*CP*AP*GP*TP*AP*CP*TP*G)-3')E, T11N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*CP*AP*GP*TP*AP*C)-3')F, P6N/A
      • Find similar nucleic acids by:  Sequence   |   Structure
      • Entity ID: 4
        MoleculeChainsLengthOrganismImage
        DNA (5'-D(P*GP*CP*CP*G)-3')D, G4N/A
        Experimental Data & Validation

        Experimental Data

        • Method: X-RAY DIFFRACTION
        • Resolution: 2.40 Å
        • R-Value Free: 0.261 
        • R-Value Work: 0.209 
        • R-Value Observed: 0.212 
        • Space Group: P 21 21 2
        Unit Cell:
        Length ( Å )Angle ( ˚ )
        a = 95.998α = 90
        b = 190.886β = 90
        c = 58.734γ = 90
        Software Package:
        Software NamePurpose
        DENZOdata reduction
        SCALEPACKdata scaling
        MOLREPphasing
        PHENIXrefinement
        PDB_EXTRACTdata extraction

        Structure Validation

        View Full Validation Report



        Entry History 

        Deposition Data

        Revision History 

        • Version 1.0: 2010-05-19
          Type: Initial release
        • Version 1.1: 2011-07-13
          Changes: Version format compliance
        • Version 1.2: 2017-07-26
          Changes: Data collection, Refinement description, Source and taxonomy
        • Version 1.3: 2017-11-08
          Changes: Refinement description