2XHI

Separation-of-function mutants unravel the dual reaction mode of human 8-oxoguanine DNA glycosylase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Separation-of-Function Mutants Unravel the Dual- Reaction Mode of Human 8-Oxoguanine DNA Glycosylase.

Dalhus, B.Forsbring, M.Helle, I.H.Vik, E.S.Forstrom, R.J.Backe, P.H.Alseth, I.Bjoras, M.

(2011) Structure 19: 117

  • DOI: 10.1016/j.str.2010.09.023
  • Primary Citation of Related Structures:  
    2XHI

  • PubMed Abstract: 
  • 7,8-Dihydro-8-oxoguanine (8oxoG) is a major mutagenic base lesion formed when reactive oxygen species react with guanine in DNA. The human 8oxoG DNA glycosylase (hOgg1) recognizes and initiates repair of 8oxoG. hOgg1 is acknowledged as a bifunctional ...

    7,8-Dihydro-8-oxoguanine (8oxoG) is a major mutagenic base lesion formed when reactive oxygen species react with guanine in DNA. The human 8oxoG DNA glycosylase (hOgg1) recognizes and initiates repair of 8oxoG. hOgg1 is acknowledged as a bifunctional DNA glycosylase catalyzing removal of the damaged base followed by cleavage of the backbone of the intermediate abasic DNA (AP lyase/β-elimination). When acting on 8oxoG-containing DNA, these two steps in the hOgg1 catalysis are considered coupled, with Lys249 implicated as a key residue. However, several lines of evidence point to a concurrent and independent monofunctional hydrolysis of the N-glycosylic bond being the in vivo relevant reaction mode of hOgg1. Here, we present biochemical and structural evidence for the monofunctional mode of hOgg1 by design of separation-of-function mutants. Asp268 is identified as the catalytic residue, while Lys249 appears critical for the specific recognition and final alignment of 8oxoG during the hydrolysis reaction.


    Organizational Affiliation

    Centre for Molecular Biology and Neuroscience and Institute of Medical Microbiology, Rikshospitalet, Oslo University Hospital, N-0027 Oslo, Norway. bjorn.dalhus@rr-research.no



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
N-GLYCOSYLASE/DNA LYASEA360Homo sapiensMutation(s): 3 
Gene Names: OGG1MMHMUTMOGH1
EC: 3.2.2 (PDB Primary Data), 4.2.99.18 (PDB Primary Data)
Find proteins for O15527 (Homo sapiens)
Explore O15527 
Go to UniProtKB:  O15527
NIH Common Fund Data Resources
PHAROS  O15527
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    5'-D(*GP*GP*TP*AP*GP*AP*CP*CP*TP*GP*GP*AP*CP*GP*C)-3'B15N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      5'-D(*GP*CP*GP*TP*CP*CP*AP*(8OG)P*GP*TP*CP*TP*AP*CP*C)-3'C15N/A
      Small Molecules
      Ligands 1 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      CA
      Query on CA

      Download CCD File 
      A, C
      CALCIUM ION
      Ca
      BHPQYMZQTOCNFJ-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 1.55 Å
      • R-Value Free: 0.265 
      • R-Value Work: 0.229 
      • R-Value Observed: 0.231 
      • Space Group: P 65 2 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 92.669α = 90
      b = 92.669β = 90
      c = 210.986γ = 120
      Software Package:
      Software NamePurpose
      REFMACrefinement
      MOSFLMdata reduction
      SCALAdata scaling
      MOLREPphasing

      Structure Validation

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      Entry History 

      Deposition Data

      Revision History 

      • Version 1.0: 2011-01-26
        Type: Initial release
      • Version 1.1: 2014-09-10
        Changes: Database references, Other, Version format compliance