1UA1

Structure of aminofluorene adduct paired opposite cytosine at the polymerase active site.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Observing translesion synthesis of an aromatic amine DNA adduct by a high-fidelity DNA polymerase

Hsu, G.W.Kiefer, J.R.Becherel, O.J.Fuchs, R.P.P.Beese, L.S.

(2004) J Biol Chem 279: 50280-50285

  • DOI: 10.1074/jbc.M409224200
  • Primary Citation of Related Structures:  
    1UA0, 1UA1

  • PubMed Abstract: 
  • Aromatic amines have been studied for more than a half-century as model carcinogens representing a class of chemicals that form bulky adducts to the C8 position of guanine in DNA. Among these guanine adducts, the N-(2'-deoxyguanosin-8-yl)-aminofluorene (G-AF) and N-2-(2'-deoxyguanosin-8-yl)-acetylaminofluorene (G-AAF) derivatives are the best studied ...

    Aromatic amines have been studied for more than a half-century as model carcinogens representing a class of chemicals that form bulky adducts to the C8 position of guanine in DNA. Among these guanine adducts, the N-(2'-deoxyguanosin-8-yl)-aminofluorene (G-AF) and N-2-(2'-deoxyguanosin-8-yl)-acetylaminofluorene (G-AAF) derivatives are the best studied. Although G-AF and G-AAF differ by only an acetyl group, they exert different effects on DNA replication by replicative and high-fidelity DNA polymerases. Translesion synthesis of G-AF is achieved with high-fidelity polymerases, whereas replication of G-AAF requires specialized bypass polymerases. Here we have presented structures of G-AF as it undergoes one round of accurate replication by a high-fidelity DNA polymerase. Nucleotide incorporation opposite G-AF is achieved in solution and in the crystal, revealing how the polymerase accommodates and replicates past G-AF, but not G-AAF. Like an unmodified guanine, G-AF adopts a conformation that allows it to form Watson-Crick hydrogen bonds with an opposing cytosine that results in protrusion of the bulky fluorene moiety into the major groove. Although incorporation opposite G-AF is observed, the C:G-AF base pair induces distortions to the polymerase active site that slow translesion synthesis.


    Related Citations: 
    • Structures of Mismatch Replication Errors Observed in a DNA Polymerase
      Johnson, S.J., Beese, L.S.
      (2004) Cell 116: 803
    • Processive DNA synthesis observed in a polymerase crystal suggests a mechanism for the prevention of frameshift mutations
      Johnson, S.J., Taylor, J.S., Beese, L.S.
      (2003) Proc Natl Acad Sci U S A 100: 3895
    • Visualizing DNA replication in a catalytically active Bacillus DNA polymerase crystal
      Kiefer, J.R., Mao, C., Braman, J.C., Beese, L.S.
      (1998) Nature 391: 304

    Organizational Affiliation

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



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase IC [auth A]580Geobacillus stearothermophilusMutation(s): 0 
Gene Names: polApol
EC: 2.7.7.7
UniProt
Find proteins for P52026 (Geobacillus stearothermophilus)
Explore P52026 
Go to UniProtKB:  P52026
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52026
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA primer strandA [auth B]11N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA template strand with aminofluorene adductB [auth C]14N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
AF
Query on AF

Download Ideal Coordinates CCD File 
D [auth C]2-AMINOFLUORENE
C13 H11 N
CFRFHWQYWJMEJN-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
G [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.639α = 90
b = 93.441β = 90
c = 105.465γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
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: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance