4RNO

Crystal structure of human polymerase eta extending an abasic site-dA pair by inserting dCTP opposite template G


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.243 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural and Kinetic Analysis of Nucleoside Triphosphate Incorporation Opposite an Abasic Site by Human Translesion DNA Polymerase eta.

Patra, A.Zhang, Q.Lei, L.Su, Y.Egli, M.Guengerich, F.P.

(2015) J Biol Chem 290: 8028-8038

  • DOI: 10.1074/jbc.M115.637561
  • Primary Citation of Related Structures:  
    4RNM, 4RNN, 4RNO

  • PubMed Abstract: 
  • The most common lesion in DNA is an abasic site resulting from glycolytic cleavage of a base. In a number of cellular studies, abasic sites preferentially code for dATP insertion (the "A rule"). In some cases frameshifts are also common. X-ray structures with abasic sites in oligonucleotides have been reported for several microbial and human DNA polymerases (pols), e ...

    The most common lesion in DNA is an abasic site resulting from glycolytic cleavage of a base. In a number of cellular studies, abasic sites preferentially code for dATP insertion (the "A rule"). In some cases frameshifts are also common. X-ray structures with abasic sites in oligonucleotides have been reported for several microbial and human DNA polymerases (pols), e.g. Dpo4, RB69, KlenTaq, yeast pol ι, human (h) pol ι, and human pol β. We reported previously that hpol η is a major pol involved in abasic site bypass (Choi, J.-Y., Lim, S., Kim, E. J., Jo, A., and Guengerich, F. P. (2010 J. Mol. Biol. 404, 34-44). hpol η inserted all four dNTPs in steady-state and pre-steady-state assays, preferentially inserting A and G. In LC-MS analysis of primer-template pairs, A and G were inserted but little C or T was inserted. Frameshifts were observed when an appropriate pyrimidine was positioned 5' to the abasic site in the template. In x-ray structures of hpol η with a non-hydrolyzable analog of dATP or dGTP opposite an abasic site, H-bonding was observed between the phosphate 5' to the abasic site and water H-bonded to N1 and N6 of A and N1 and O6 of G nucleoside triphosphate analogs, offering an explanation for what appears to be a "purine rule." A structure was also obtained for an A inserted and bonded in the primer opposite the abasic site, but it did not pair with a 5' T in the template. We conclude that hpol η, a major copying enzyme with abasic sites, follows a purine rule, which can also lead to frameshifts. The phenomenon can be explained with H-bonds.


    Organizational Affiliation

    From the Department of Biochemistry and Center in Molecular Toxicology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146 f.guengerich@vanderbilt.edu.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase eta A435Homo sapiensMutation(s): 0 
Gene Names: POLHRAD30RAD30AXPV
EC: 2.7.7.7
Find proteins for Q9Y253 (Homo sapiens)
Explore Q9Y253 
Go to UniProtKB:  Q9Y253
NIH Common Fund Data Resources
PHAROS:  Q9Y253
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    Nucleic acids Template: CATG(3DR)TGACGCTT12synthetic construct
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      Nucleic acids Primar: AGCGTCAAP8synthetic construct
      Small Molecules
      Ligands 3 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      DCP
      Query on DCP

      Download Ideal Coordinates CCD File 
      A
      2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE
      C9 H16 N3 O13 P3
      RGWHQCVHVJXOKC-SHYZEUOFSA-N
       Ligand Interaction
      GOL
      Query on GOL

      Download Ideal Coordinates CCD File 
      A
      GLYCEROL
      C3 H8 O3
      PEDCQBHIVMGVHV-UHFFFAOYSA-N
       Ligand Interaction
      CA
      Query on CA

      Download Ideal Coordinates CCD File 
      A
      CALCIUM ION
      Ca
      BHPQYMZQTOCNFJ-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.82 Å
      • R-Value Free: 0.282 
      • R-Value Work: 0.241 
      • R-Value Observed: 0.243 
      • Space Group: P 61
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 98.788α = 90
      b = 98.788β = 90
      c = 82.008γ = 120
      Software Package:
      Software NamePurpose
      PHENIXrefinement

      Structure Validation

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      Entry History 

      Deposition Data

      • Deposited Date: 2014-10-24 
      • Released Date: 2015-02-18 
      • Deposition Author(s): Patra, A., Egli, M.

      Revision History  (Full details and data files)

      • Version 1.0: 2015-02-18
        Type: Initial release
      • Version 1.1: 2015-04-22
        Changes: Database references