2FLP

Binary complex of the catalytic core of human DNA polymerase iota with DNA (template G)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.233 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

An incoming nucleotide imposes an anti to syn conformational change on the templating purine in the human DNA polymerase-iota active site.

Nair, D.T., Johnson, R.E., Prakash, L., Prakash, S., Aggarwal, A.K.

(2006) Structure 14: 749-755

  • DOI: 10.1016/j.str.2006.01.010
  • Primary Citation of Related Structures:  
    2FLN, 2FLL, 2FLP

  • PubMed Abstract: 

    • Substrate-induced conformational change of the protein is the linchpin of enzymatic reactions. Replicative DNA polymerases, for example, convert from an open to a closed conformation in response to dNTP binding. Human DNA polymerase-iota (hPoliota), a member of the Y family of DNA polymerases, differs strikingly from other polymerases in its much higher proficiency and fidelity for nucleotide incorporation opposite template purines than opposite template pyrimidines ...

    Substrate-induced conformational change of the protein is the linchpin of enzymatic reactions. Replicative DNA polymerases, for example, convert from an open to a closed conformation in response to dNTP binding. Human DNA polymerase-iota (hPoliota), a member of the Y family of DNA polymerases, differs strikingly from other polymerases in its much higher proficiency and fidelity for nucleotide incorporation opposite template purines than opposite template pyrimidines. We present here a crystallographic analysis of hPoliota binary complexes, which together with the ternary complexes show that, contrary to replicative DNA polymerases, the DNA, and not the polymerase, undergoes the primary substrate-induced conformational change. The incoming dNTP "pushes" templates A and G from the anti to the syn conformation dictated by a rigid hPoliota active site. Together, the structures posit a mechanism for template selection wherein dNTP binding induces a conformational switch in template purines for productive Hoogsteen base pairing.

    Organizational Affiliation: 

    Structural Biology Program, Department of Physiology and Biophysics, Mount Sinai School of Medicine, Box 1677, 1425 Madison Avenue, New York, New York 10029, USA.



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase iotaC [auth A]420Homo sapiensMutation(s): 0 
Gene Names: POLI, RAD30B
EC: 2.7.7.7
Find proteins for Q9UNA4 (Homo sapiens)
Explore Q9UNA4 
Go to UniProtKB:  Q9UNA4
NIH Common Fund Data Resources
PHAROS:  Q9UNA4
GTEx:  ENSG00000101751
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 1
    MoleculeChainsLengthOrganismImage
    DNA template strandA [auth T]11N/A
    Protein Feature View
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    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
      • Entity ID: 2
      MoleculeChainsLengthOrganismImage
      DNA primer strandB [auth P]7N/A
      Protein Feature View
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      • Reference Sequence
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.40 Å
      • R-Value Free: 0.276 
      • R-Value Work: 0.228 
      • R-Value Observed: 0.233 
      • Space Group: P 65 2 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 98.367α = 90
      b = 98.367β = 90
      c = 202.497γ = 120
      Software Package:
      Software NamePurpose
      REFMACrefinement
      HKL-2000data reduction
      SCALEPACKdata scaling
      AMoREphasing

      Structure Validation

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      View more in-depth experimental data

      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2006-12-05
        Type: Initial release
      • Version 1.1: 2008-05-01
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Advisory, Version format compliance