3U6P

MutM set 1 GpG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Sequence-dependent structural variation in DNA undergoing intrahelical inspection by the DNA glycosylase MutM.

Sung, R.J.Zhang, M.Qi, Y.Verdine, G.L.

(2012) J Biol Chem 287: 18044-18054

  • DOI: 10.1074/jbc.M111.313635
  • Primary Citation of Related Structures:  
    3U6L, 3U6M, 3U6O, 3U6P, 3U6Q, 3U6S, 3U6D, 3U6E, 3U6C

  • PubMed Abstract: 
  • MutM, a bacterial DNA-glycosylase, plays a critical role in maintaining genome integrity by catalyzing glycosidic bond cleavage of 8-oxoguanine (oxoG) lesions to initiate base excision DNA repair. The task faced by MutM of locating rare oxoG residues embedded in an overwhelming excess of undamaged bases is especially challenging given the close structural similarity between oxoG and its normal progenitor, guanine (G) ...

    MutM, a bacterial DNA-glycosylase, plays a critical role in maintaining genome integrity by catalyzing glycosidic bond cleavage of 8-oxoguanine (oxoG) lesions to initiate base excision DNA repair. The task faced by MutM of locating rare oxoG residues embedded in an overwhelming excess of undamaged bases is especially challenging given the close structural similarity between oxoG and its normal progenitor, guanine (G). MutM actively interrogates the DNA to detect the presence of an intrahelical, fully base-paired oxoG, whereupon the enzyme promotes extrusion of the target nucleobase from the DNA duplex and insertion into the extrahelical active site. Recent structural studies have begun to provide the first glimpse into the protein-DNA interactions that enable MutM to distinguish an intrahelical oxoG from G; however, these initial studies left open the important question of how MutM can recognize oxoG residues embedded in 16 different neighboring sequence contexts (considering only the 5'- and 3'-neighboring base pairs). In this study we set out to understand the manner and extent to which intrahelical lesion recognition varies as a function of the 5'-neighbor. Here we report a comprehensive, systematic structural analysis of the effect of the 5'-neighboring base pair on recognition of an intrahelical oxoG lesion. These structures reveal that MutM imposes the same extrusion-prone ("extrudogenic") backbone conformation on the oxoG lesion irrespective of its 5'-neighbor while leaving the rest of the DNA relatively free to adjust to the particular demands of individual sequences.


    Organizational Affiliation

    Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Formamidopyrimidine-DNA glycosylaseA273Geobacillus stearothermophilusMutation(s): 2 
Gene Names: mutMfpg
EC: 3.2.2.23 (PDB Primary Data), 4.2.99.18 (UniProt)
Find proteins for P84131 (Geobacillus stearothermophilus)
Explore P84131 
Go to UniProtKB:  P84131
Protein Feature View
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  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*A*GP*GP*TP*AP*GP*AP*TP*CP*CP*CP*GP*AP*CP*GP*C)-3')B16N/A
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*TP*GP*CP*GP*TP*CP*GP*GP*GP*AP*(08Q)P*CP*TP*AP*CP*C)-3')C16N/A
      Small Molecules
      Ligands 1 Unique
      IDChainsName / Formula / InChI Key2D Diagram3D Interactions
      ZN
      Query on ZN

      Download Ideal Coordinates CCD File 
      D [auth A]ZINC ION
      Zn
      PTFCDOFLOPIGGS-UHFFFAOYSA-N
       Ligand Interaction
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 1.60 Å
      • R-Value Free: 0.205 
      • R-Value Work: 0.193 
      • R-Value Observed: 0.193 
      • Space Group: P 21 21 21
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 45.188α = 90
      b = 93.541β = 90
      c = 104.65γ = 90
      Software Package:
      Software NamePurpose
      PHENIXrefinement
      HKL-2000data reduction
      HKL-2000data scaling

      Structure Validation

      View Full Validation Report



      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2012-04-25
        Type: Initial release
      • Version 1.1: 2012-08-29
        Changes: Database references
      • Version 1.2: 2013-09-25
        Changes: Derived calculations