5J2I

Ternary complex crystal structure of DNA polymerase Beta with T:C mismatch at the primer terminus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.191 

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This is version 1.2 of the entry. See complete history


Literature

Structures of DNA Polymerase Mispaired DNA Termini Transitioning to Pre-catalytic Complexes Support an Induced-Fit Fidelity Mechanism.

Batra, V.K.Beard, W.A.Pedersen, L.C.Wilson, S.H.

(2016) Structure 24: 1863-1875

  • DOI: https://doi.org/10.1016/j.str.2016.08.006
  • Primary Citation of Related Structures:  
    5J0O, 5J0P, 5J0Q, 5J0R, 5J0S, 5J0T, 5J0U, 5J0W, 5J0X, 5J0Y, 5J29, 5J2A, 5J2B, 5J2C, 5J2D, 5J2E, 5J2F, 5J2G, 5J2H, 5J2I, 5J2J, 5J2K, 5TZV

  • PubMed Abstract: 

    High-fidelity DNA synthesis requires that polymerases display a strong preference for right nucleotide insertion. When the wrong nucleotide is inserted, the polymerase deters extension from the mismatched DNA terminus. Twenty-three crystallographic structures of DNA polymerase β with terminal template-primer mismatches were determined as binary DNA and ternary pre-catalytic substrate complexes. These structures indicate that the mismatched termini adopt various distorted conformations that attempt to satisfy stacking and hydrogen-bonding interactions. The binary complex structures indicate an induced strain in the mismatched template nucleotide. Addition of a non-hydrolyzable incoming nucleotide stabilizes the templating nucleotide with concomitant strain in the primer terminus. Several dead-end ternary complex structures suggest that DNA synthesis might occur as the enzyme transitions from an open to a closed complex. The structures are consistent with an induced-fit mechanism where a mismatched terminus is misaligned relative to the correct incoming nucleotide to deter or delay further DNA synthesis.


  • Organizational Affiliation

    Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709-12233, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase beta335Homo sapiensMutation(s): 0 
Gene Names: POLB
EC: 2.7.7.7 (PDB Primary Data), 4.2.99 (PDB Primary Data), 4.2.99.18 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P06746 (Homo sapiens)
Explore P06746 
Go to UniProtKB:  P06746
PHAROS:  P06746
GTEx:  ENSG00000070501 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06746
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
Template StrandB [auth T]16synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
Primer StrandC [auth P]10synthetic construct
Sequence Annotations
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  • Reference Sequence

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Entity ID: 4
MoleculeChains LengthOrganismImage
Downstream Primer Strand5synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.191 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.63α = 90
b = 80.15β = 107.51
c = 55.46γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2016-11-09
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Derived calculations