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 

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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 DNA glycosylase catalyzing removal of the damaged base followed by cleavage of the backbone of the intermediate abasic DNA (AP lyase/β-elimination) ...

    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: OGG1, MMH, MUTM, OGH1
EC: 3.2.2 (PDB Primary Data), 4.2.99.18 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for O15527 (Homo sapiens)
Explore O15527 
Go to UniProtKB:  O15527
PHAROS:  O15527
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO15527
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-D(*GP*GP*TP*AP*GP*AP*CP*CP*TP*GP*GP*AP*CP*GP*C)-3'B15N/A
Protein Feature View
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  • Reference Sequence

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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
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA
Download Ideal Coordinates CCD File 
D [auth A],
E [auth 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  (Full details and data files)

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