3PNC

Ternary crystal structure of a polymerase lambda variant with a GT mispair at the primer terminus and sodium at catalytic metal site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Replication infidelity via a mismatch with Watson-Crick geometry.

Bebenek, K.Pedersen, L.C.Kunkel, T.A.

(2011) Proc.Natl.Acad.Sci.USA 108: 1862-1867

  • DOI: 10.1073/pnas.1012825108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In describing the DNA double helix, Watson and Crick suggested that "spontaneous mutation may be due to a base occasionally occurring in one of its less likely tautomeric forms." Indeed, among many mispairing possibilities, either tautomerization or ...

    In describing the DNA double helix, Watson and Crick suggested that "spontaneous mutation may be due to a base occasionally occurring in one of its less likely tautomeric forms." Indeed, among many mispairing possibilities, either tautomerization or ionization of bases might allow a DNA polymerase to insert a mismatch with correct Watson-Crick geometry. However, despite substantial progress in understanding the structural basis of error prevention during polymerization, no DNA polymerase has yet been shown to form a natural base-base mismatch with Watson-Crick-like geometry. Here we provide such evidence, in the form of a crystal structure of a human DNA polymerase λ variant poised to misinsert dGTP opposite a template T. All atoms needed for catalysis are present at the active site and in positions that overlay with those for a correct base pair. The mismatch has Watson-Crick geometry consistent with a tautomeric or ionized base pair, with the pH dependence of misinsertion consistent with the latter. The results support the original idea that a base substitution can originate from a mismatch having Watson-Crick geometry, and they suggest a common catalytic mechanism for inserting a correct and an incorrect nucleotide. A second structure indicates that after misinsertion, the now primer-terminal G • T mismatch is also poised for catalysis but in the wobble conformation seen in other studies, indicating the dynamic nature of the pathway required to create a mismatch in fully duplex DNA.


    Organizational Affiliation

    Laboratory of Molecular Genetics, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase lambda
A
329Homo sapiensMutation(s): 0 
Gene Names: POLL
EC: 2.7.7.7, 4.2.99.-
Find proteins for Q9UGP5 (Homo sapiens)
Go to Gene View: POLL
Go to UniProtKB:  Q9UGP5
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*CP*AP*GP*TP*AP*G)-3'B6N/A
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(*CP*GP*GP*CP*CP*TP*TP*AP*CP*TP*G)-3'C11N/A
Entity ID: 4
MoleculeChainsLengthOrganism
5'-D(*GP*CP*CP*G)-3'D4N/A
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
1GC
Query on 1GC

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A
2'-deoxy-5'-O-[(R)-hydroxy{[(S)-hydroxy(phosphonooxy)phosphoryl]methyl}phosphoryl]guanosine
C11 H18 N5 O12 P3
JTBKCZGNQPBEJY-RRKCRQDMSA-N
 Ligand Interaction
TRS
Query on TRS

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A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.161α = 90.00
b = 62.254β = 90.00
c = 139.834γ = 90.00
Software Package:
Software NamePurpose
CrystalCleardata collection
CNSrefinement
HKL-2000data reduction
MOLREPphasing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance