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 

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This is version 1.2 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: 10.1038/emboj.2010.64
  • Primary Citation of Related Structures:  

  • 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 ins ...

    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

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase I, thermostable
A
540Thermus aquaticusMutation(s): 0 
Gene Names: polA (pol1)
EC: 2.7.7.7
Find proteins for P19821 (Thermus aquaticus)
Go to UniProtKB:  P19821
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*AP*CP*CP*AP*CP*GP*GP*CP*GP*CP*(2DA))-3')B12N/A
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*AP*AP*(3DR)P*TP*GP*CP*GP*CP*CP*GP*TP*GP*GP*TP*C)-3')C16N/A
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA
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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT
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A, C
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL
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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
DDS
Query on DDS
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Download CCD File 
A
2',3'-dideoxyadenosine triphosphate
C10 H16 N5 O11 P3
OAKPWEUQDVLTCN-NKWVEPMBSA-N
 Ligand Interaction
MG
Query on MG
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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
2DA
Query on 2DA
B
DNA LINKINGC10 H14 N5 O5 PDA
3DR
Query on 3DR
C
DNA LINKINGC5 H11 O6 P

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.188 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 110.228α = 90.00
b = 110.228β = 90.00
c = 91.265γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
PHENIXmodel building
PHENIXphasing
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-05
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-02-12
    Type: Database references