1T8E

T7 DNA Polymerase Ternary Complex with dCTP at the Insertion Site.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 

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This is version 1.2 of the entry. See complete history. 


Literature

Structural basis for the dual coding potential of 8-oxoguanosine by a high-fidelity DNA polymerase.

Brieba, L.G., Eichman, B.F., Kokoska, R.J., Doublie, S., Kunkel, T.A., Ellenberger, T.

(2004) EMBO J 23: 3452-3461

  • DOI: 10.1038/sj.emboj.7600354
  • Primary Citation of Related Structures:  
    1T8E, 1TK0, 1TK5, 1TK8, 1TKD

  • PubMed Abstract: 

    • Accurate DNA replication involves polymerases with high nucleotide selectivity and proofreading activity. We show here why both fidelity mechanisms fail when normally accurate T7 DNA polymerase bypasses the common oxidative lesion 8-oxo-7, 8-dihydro-2'-deoxyguanosine (8oG) ...

    Accurate DNA replication involves polymerases with high nucleotide selectivity and proofreading activity. We show here why both fidelity mechanisms fail when normally accurate T7 DNA polymerase bypasses the common oxidative lesion 8-oxo-7, 8-dihydro-2'-deoxyguanosine (8oG). The crystal structure of the polymerase with 8oG templating dC insertion shows that the O8 oxygen is tolerated by strong kinking of the DNA template. A model of a corresponding structure with dATP predicts steric and electrostatic clashes that would reduce but not eliminate insertion of dA. The structure of a postinsertional complex shows 8oG(syn).dA (anti) in a Hoogsteen-like base pair at the 3' terminus, and polymerase interactions with the minor groove surface of the mismatch that mimic those with undamaged, matched base pairs. This explains why translesion synthesis is permitted without proofreading of an 8oG.dA mismatch, thus providing insight into the high mutagenic potential of 8oG.

    Organizational Affiliation: 

    Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymeraseC [auth A]698Escherichia phage T7Mutation(s): 0 
Gene Names: 5, T7DNApolymerase
EC: 2.7.7.7 (PDB Primary Data), 3.1.11 (UniProt)
UniProt
Find proteins for P00581 (Escherichia phage T7)
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Go to UniProtKB:  P00581
Entity Groups  
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UniProt GroupP00581
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
thioredoxin 1D [auth B]108Escherichia coliMutation(s): 0 
Gene Names: trxA, tsnC, fipA, b3781, c4701, z5291, Thioredoxin
UniProt
Find proteins for P0AA25 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0AA25
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UniProt GroupP0AA25
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-D(P*CP*GP*AP*AP*AP*AP*CP*GP*AP*CP*GP*GP*CP*CP*AP*GP*TP*GP*CP*CP*AP*(2DT))-3'A [auth C]22N/A
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Entity ID: 2
MoleculeChainsLengthOrganismImage
25-MERB [auth D]26N/A
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DCT
Query on DCT
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I [auth A]2',3'-DIDEOXYCYTIDINE 5'-TRIPHOSPHATE
C9 H16 N3 O12 P3
ARLKCWCREKRROD-POYBYMJQSA-N		 Ligand Interaction
MES
Query on MES
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J [auth A]2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N		 Ligand Interaction
PG4
Query on PG4
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K [auth A]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N		 Ligand Interaction
SO4
Query on SO4
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H [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
MG
Query on MG
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E [auth A],
F [auth A],
G [auth A]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.285α = 90
b = 218.121β = 90
c = 52.133γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-10-12
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance