4RQ5

Human DNA Polymerase Beta With Gapped DNA Containing an 8-oxo-7,8-dihydro-Guanine (8-oxoG)and dATP soaked with MgCl2 for 60 s


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Viewing Human DNA Polymerase beta Faithfully and Unfaithfully Bypass an Oxidative Lesion by Time-Dependent Crystallography.

Vyas, R.Reed, A.J.Tokarsky, E.J.Suo, Z.

(2015) J.Am.Chem.Soc. 137: 5225-5230

  • DOI: 10.1021/jacs.5b02109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • One common oxidative DNA lesion, 8-oxo-7,8-dihydro-2'-deoxyguanine (8-oxoG), is highly mutagenic in vivo due to its anti-conformation forming a Watson-Crick base pair with correct deoxycytidine 5'-triphosphate (dCTP) and its syn-conformation forming ...

    One common oxidative DNA lesion, 8-oxo-7,8-dihydro-2'-deoxyguanine (8-oxoG), is highly mutagenic in vivo due to its anti-conformation forming a Watson-Crick base pair with correct deoxycytidine 5'-triphosphate (dCTP) and its syn-conformation forming a Hoogsteen base pair with incorrect deoxyadenosine 5'-triphosphate (dATP). Here, we utilized time-resolved X-ray crystallography to follow 8-oxoG bypass by human DNA polymerase β (hPolβ). In the 12 solved structures, both Watson-Crick (anti-8-oxoG:anti-dCTP) and Hoogsteen (syn-8-oxoG:anti-dATP) base pairing were clearly visible and were maintained throughout the chemical reaction. Additionally, a third Mg(2+) appeared during the process of phosphodiester bond formation and was located between the reacting α- and β-phosphates of the dNTP, suggesting its role in stabilizing reaction intermediates. After phosphodiester bond formation, hPolβ reopened its conformation, pyrophosphate was released, and the newly incorporated primer 3'-terminal nucleotide stacked, rather than base paired, with 8-oxoG. These structures provide the first real-time pictures, to our knowledge, of how a polymerase correctly and incorrectly bypasses a DNA lesion.


    Organizational Affiliation

    †Department of Chemistry and Biochemistry, ‡The Ohio State Biochemistry and §Biophysics Programs, The Ohio State University, Columbus, Ohio 43210, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA polymerase beta
A
343Homo sapiensMutation(s): 0 
Gene Names: POLB
EC: 2.7.7.7, 4.2.99.-
Find proteins for P06746 (Homo sapiens)
Go to Gene View: POLB
Go to UniProtKB:  P06746
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(P*GP*TP*CP*GP*G)-3')D5synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*TP*GP*AP*TP*GP*CP*GP*CP*A)-3')P11synthetic construct
Entity ID: 4
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*GP*AP*CP*(8OG)P*GP*CP*GP*CP*AP*TP*CP*AP*GP*C)-3')T16synthetic construct
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DTP
Query on DTP

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A
2'-DEOXYADENOSINE 5'-TRIPHOSPHATE
C10 H16 N5 O12 P3
SUYVUBYJARFZHO-RRKCRQDMSA-N
 Ligand Interaction
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
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

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A, P
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
PPV
Query on PPV

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A
PYROPHOSPHATE
H4 O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
8OG
Query on 8OG
T
DNA LINKINGC10 H14 N5 O8 PDG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.32 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.196 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.212α = 90.00
b = 79.702β = 106.66
c = 55.384γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
MOSFLMdata reduction
PHASERphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2014-10-31 
  • Released Date: 2015-04-15 
  • Deposition Author(s): Vyas, R., Suo, Z.

Revision History 

  • Version 1.0: 2015-04-15
    Type: Initial release
  • Version 1.1: 2015-05-06
    Type: Database references