3LWL

Structure of Klenow fragment of Taq polymerase in complex with an abasic site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.191 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Replication through an abasic DNA lesion: structural basis for adenine selectivity

Obeid, S.Blatter, N.Kranaster, R.Schnur, A.Diederichs, K.Welte, W.Marx, A.

(2010) EMBO J 29: 1738-1747

  • DOI: https://doi.org/10.1038/emboj.2010.64
  • Primary Citation of Related Structures:  
    3LWL, 3LWM

  • PubMed Abstract: 

    Abasic sites represent the most frequent DNA lesions in the genome that have high mutagenic potential and lead to mutations commonly found in human cancers. Although these lesions are devoid of the genetic information, adenine is most efficiently inserted when abasic sites are bypassed by DNA polymerases, a phenomenon termed A-rule. In this study, we present X-ray structures of a DNA polymerase caught while incorporating a nucleotide opposite an abasic site. We found that a functionally important tyrosine side chain directs for nucleotide incorporation rather than DNA. It fills the vacant space of the absent template nucleobase and thereby mimics a pyrimidine nucleobase directing for preferential purine incorporation opposite abasic residues because of enhanced geometric fit to the active site. This amino acid templating mechanism was corroborated by switching to pyrimidine specificity because of mutation of the templating tyrosine into tryptophan. The tyrosine is located in motif B and highly conserved throughout evolution from bacteria to humans indicating a general amino acid templating mechanism for bypass of non-instructive lesions by DNA polymerases at least from this sequence family.


  • Organizational Affiliation

    Konstanz Research School Chemical Biology, University of Konstanz, Konstanz, Germany.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA polymerase I, thermostable540Thermus aquaticusMutation(s): 0 
Gene Names: pol1polA
EC: 2.7.7.7
UniProt
Find proteins for P19821 (Thermus aquaticus)
Explore P19821 
Go to UniProtKB:  P19821
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19821
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*GP*AP*CP*CP*AP*CP*GP*GP*CP*GP*CP*(2DA))-3')12N/A
Sequence Annotations
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  • Reference Sequence

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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(*AP*AP*AP*(3DR)P*TP*GP*CP*GP*CP*CP*GP*TP*GP*GP*TP*C)-3')16N/A
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DDS
Query on DDS

Download Ideal Coordinates CCD File 
D [auth A]2',3'-dideoxyadenosine triphosphate
C10 H16 N5 O11 P3
OAKPWEUQDVLTCN-NKWVEPMBSA-N
GOL
Query on GOL

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I [auth A]
J [auth A]
K [auth A]
L [auth A]
M [auth A]
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
R [auth B],
S [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
ACT
Query on ACT

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F [auth A],
G [auth A],
H [auth A],
T [auth C],
U [auth C]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
MG
Query on MG

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E [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
NA
Query on NA

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N [auth A],
O [auth A],
P [auth A],
Q [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.191 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.228α = 90
b = 110.228β = 90
c = 91.265γ = 120
Software Package:
Software NamePurpose
PHENIXmodel building
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-02-12
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description