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 

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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:  
    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 ...

    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
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase I, thermostableA540Thermus aquaticusMutation(s): 0 
Gene Names: pol1, polA
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
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*GP*AP*CP*CP*AP*CP*GP*GP*CP*GP*CP*(2DA))-3')B 12N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*AP*AP*(3DR)P*TP*GP*CP*GP*CP*CP*GP*TP*GP*GP*TP*C)-3')C 16N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DDS
Query on DDS
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D [auth A]2',3'-dideoxyadenosine triphosphate
C10 H16 N5 O11 P3
OAKPWEUQDVLTCN-NKWVEPMBSA-N		 Ligand Interaction
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		 Ligand Interaction
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		 Ligand Interaction
MG
Query on MG
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E [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
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		 Ligand Interaction
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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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