3TAR

Crystal Structure of Bacillus DNA Polymerase I Large Fragment Bound to Duplex DNA with Cytosine-Adenine Mismatch at (n-6) Position

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 

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This is version 2.1 of the entry. See complete history. 


Literature

Structural evidence for the rare tautomer hypothesis of spontaneous mutagenesis.

Wang, W., Hellinga, H.W., Beese, L.S.

(2011) Proc Natl Acad Sci U S A 108: 17644-17648

  • DOI: https://doi.org/10.1073/pnas.1114496108
  • Primary Citation of Related Structures:  
    3PV8, 3PX0, 3PX4, 3PX6, 3TAN, 3TAP, 3TAQ, 3TAR, 3THV, 3TI0

  • PubMed Abstract: 

    • Even though high-fidelity polymerases copy DNA with remarkable accuracy, some base-pair mismatches are incorporated at low frequency, leading to spontaneous mutagenesis. Using high-resolution X-ray crystallographic analysis of a DNA polymerase that catalyzes replication in crystals, we observe that a C • A mismatch can mimic the shape of cognate base pairs at the site of incorporation ...

    Even though high-fidelity polymerases copy DNA with remarkable accuracy, some base-pair mismatches are incorporated at low frequency, leading to spontaneous mutagenesis. Using high-resolution X-ray crystallographic analysis of a DNA polymerase that catalyzes replication in crystals, we observe that a C • A mismatch can mimic the shape of cognate base pairs at the site of incorporation. This shape mimicry enables the mismatch to evade the error detection mechanisms of the polymerase, which would normally either prevent mismatch incorporation or promote its nucleolytic excision. Movement of a single proton on one of the mismatched bases alters the hydrogen-bonding pattern such that a base pair forms with an overall shape that is virtually indistinguishable from a canonical, Watson-Crick base pair in double-stranded DNA. These observations provide structural evidence for the rare tautomer hypothesis of spontaneous mutagenesis, a long-standing concept that has been difficult to demonstrate directly.

    Related Citations: 
    • Structures of mismatch replication errors observed in a DNA polymerase.
      Johnson, S.J., Beese, L.S.
      (2004) Cell 116: 803
    Organizational Affiliation: 

    Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase I592GeobacillusMutation(s): 0 
EC: 2.7.7.7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-D(*GP*CP*GP*AP*TP*CP*AP*CP*GP*CP*AP*CP*GP*TP*C)-3'15N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
5'-D(*GP*AP*CP*GP*TP*AP*CP*GP*TP*GP*AP*TP*CP*GP*CP*A)-3'16N/A
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
beta-D-fructofuranose-(2-1)-alpha-D-glucopyranose
D, E
2N/A Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G05551OP
GlyCosmos:  G05551OP
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A]		SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
I [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 4
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900003
Query on PRD_900003
D, E
sucroseOligosaccharide / Nutrient Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.75α = 90
b = 93.84β = 90
c = 105.77γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
REFMACphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-10-19
    Type: Initial release
  • Version 1.1: 2011-11-16
    Changes: Database references
  • Version 1.2: 2014-04-02
    Changes: Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2023-09-13
    Changes: Data collection, Database references, Refinement description, Structure summary