2NOF

Structure of Q315F human 8-oxoguanine glycosylase proximal crosslink to 8-oxoguanine DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.227 

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This is version 1.3 of the entry. See complete history. 


Literature

Structural characterization of human 8-oxoguanine DNA glycosylase variants bearing active site mutations.

Radom, C.T., Banerjee, A., Verdine, G.L.

(2007) J Biol Chem 282: 9182-9194

  • DOI: 10.1074/jbc.M608989200
  • Primary Citation of Related Structures:  
    2NOI, 2NOH, 2NOF, 2NOE, 2NOL, 2NOB, 2NOZ

  • PubMed Abstract: 

    • The human 8-oxoguanine DNA glycosylase (hOGG1) protein is responsible for initiating base excision DNA repair of the endogenous mutagen 8-oxoguanine. Like nearly all DNA glycosylases, hOGG1 extrudes its substrate from the DNA helix and inserts it into an ...

    The human 8-oxoguanine DNA glycosylase (hOGG1) protein is responsible for initiating base excision DNA repair of the endogenous mutagen 8-oxoguanine. Like nearly all DNA glycosylases, hOGG1 extrudes its substrate from the DNA helix and inserts it into an extrahelical enzyme active site pocket lined with residues that participate in lesion recognition and catalysis. Structural analysis has been performed on mutant versions of hOGG1 having changes in catalytic residues but not on variants having altered 7,8-dihydro-8-oxoguanine (oxoG) contact residues. Here we report high resolution structural analysis of such recognition variants. We found that Ala substitution at residues that contact the phosphate 5' to the lesion (H270A mutation) and its Watson-Crick face (Q315A mutation) simply removed key functionality from the contact interface but otherwise had no effect on structure. Ala substitution at the only residue making an oxoG-specific contact (G42A mutation) introduced torsional stress into the DNA contact surface of hOGG1, but this was overcome by local interactions within the folded protein, indicating that this oxoG recognition motif is "hardwired." Introduction of a side chain intended to sterically obstruct the active site pocket (Q315F mutation) led to two different structures, one of which (Q315F(*149)) has the oxoG lesion in an exosite flanking the active site and the other of which (Q315F(*292)) has the oxoG inserted nearly completely into the lesion recognition pocket. The latter structure offers a view of the latest stage in the base extrusion pathway yet observed, and its lack of catalytic activity demonstrates that the transition state for displacement of the lesion base is geometrically demanding.

    Organizational Affiliation: 

    Department of Chemistry, Harvard University, Cambridge, Massachusetts 02138, USA.



Macromolecules

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(by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
N-glycosylase/DNA lyase A325Homo sapiensMutation(s): 2 
Gene Names: OGG1, MMH, MUTM, OGH1
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
GTEx:  ENSG00000114026
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 1
    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: 2
      MoleculeChainsLengthOrganismImage
      5'-D(*GP*CP*GP*TP*C*CP*AP*(G42)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 Ideal Coordinates CCD File 
      A
      		CALCIUM ION
      Ca
      BHPQYMZQTOCNFJ-UHFFFAOYSA-N      		 Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.35 Å
      • R-Value Free: 0.270 
      • R-Value Work: 0.227 
      • Space Group: P 65 2 2
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 92.267α = 90
      b = 92.267β = 90
      c = 211.128γ = 120
      Software Package:
      Software NamePurpose
      DENZOdata reduction
      SCALEPACKdata scaling
      CNSrefinement
      PDB_EXTRACTdata extraction
      CBASSdata collection
      HKL-2000data reduction
      CNSphasing

      Structure Validation

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      View more in-depth experimental data

      Entry History 

      Deposition Data

      Revision History 

      • Version 1.0: 2006-11-21
        Type: Initial release
      • Version 1.1: 2008-05-01
        Changes: Version format compliance
      • Version 1.2: 2011-07-13
        Changes: Version format compliance
      • Version 1.3: 2017-10-18
        Changes: Refinement description