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 

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

  • 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

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
N-GLYCOSYLASE/DNA LYASE
A
360Homo sapiensMutation(s): 3 
Gene Names: OGG1 (MMH, MUTM, OGH1)
Find proteins for O15527 (Homo sapiens)
Go to Gene View: OGG1
Go to UniProtKB:  O15527
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*GP*GP*TP*AP*GP*AP*CP*CP*TP*GP*GP*AP*CP*GP*C)-3'B15N/A
Entity ID: 3
MoleculeChainsLengthOrganism
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 SDF File 
Download CCD File 
A, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
8OG
Query on 8OG
C
DNA LINKINGC10 H14 N5 O8 PDG
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.229 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 92.669α = 90.00
b = 92.669β = 90.00
c = 210.986γ = 120.00
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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