4IRC

Polymerase-DNA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

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This is version 1.2 of the entry. See complete history


Literature

A strategically located serine residue is critical for the mutator activity of DNA polymerase IV from Escherichia coli.

Sharma, A.Kottur, J.Narayanan, N.Nair, D.T.

(2013) Nucleic Acids Res 41: 5104-5114

  • DOI: https://doi.org/10.1093/nar/gkt146
  • Primary Citation of Related Structures:  
    4IR1, 4IR9, 4IRC, 4IRD, 4IRK

  • PubMed Abstract: 

    The Y-family DNA polymerase IV or PolIV (Escherichia coli) is the founding member of the DinB family and is known to play an important role in stress-induced mutagenesis. We have determined four crystal structures of this enzyme in its pre-catalytic state in complex with substrate DNA presenting the four possible template nucleotides that are paired with the corresponding incoming nucleotide triphosphates. In all four structures, the Ser42 residue in the active site forms interactions with the base moieties of the incipient Watson-Crick base pair. This residue is located close to the centre of the nascent base pair towards the minor groove. In vitro and in vivo assays show that the fidelity of the PolIV enzyme increases drastically when this Ser residue was mutated to Ala. In addition, the structure of PolIV with the mismatch A:C in the active site shows that the Ser42 residue plays an important role in stabilizing dCTP in a conformation compatible with catalysis. Overall, the structural, biochemical and functional data presented here show that the Ser42 residue is present at a strategic location to stabilize mismatches in the PolIV active site, and thus facilitate the appearance of transition and transversion mutations.


  • Organizational Affiliation

    National Centre for Biological Sciences (NCBS-TIFR), UAS-GKVK Campus, Bellary Road, Bangalore 560065, India.


Macromolecules

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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase IVE [auth F],
F [auth A]
342Escherichia coli K-12Mutation(s): 0 
Gene Names: b0231dinBdinPJW0221
EC: 2.7.7.7
UniProt
Find proteins for Q47155 (Escherichia coli (strain K12))
Explore Q47155 
Go to UniProtKB:  Q47155
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ47155
Sequence Annotations
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  • Reference Sequence

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Entity ID: 1
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*CP*TP*GP*GP*GP*GP*TP*CP*CP*TP*AP*GP*GP*AP*CP*CP*C)-3')A [auth G],
C [auth B]
18N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*GP*GP*GP*TP*CP*CP*TP*AP*GP*GP*AP*CP*CP*C)-3')B [auth H]14N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*CP*TP*AP*GP*GP*GP*TP*CP*CP*TP*AP*GP*GP*AP*CP*CP*C)-3')D [auth C]17N/A
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.14α = 90
b = 56.95β = 93.53
c = 110.81γ = 90
Software Package:
Software NamePurpose
MxCuBEdata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2013-05-29
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations