1OE4

Xenopus SMUG1, an anti-mutator uracil-DNA Glycosylase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Structure and Specificity of the Vertebrate Anti-Mutator Uracil-DNA Glycosylase Smug1

Wibley, J.E.A., Waters, T.R., Haushalter, K., Verdine, G.L., Pearl, L.H.

(2003) Mol.Cell 11: 1647

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • Cytosine deamination is a major promutagenic process, generating G:U mismatches that can cause transition mutations if not repaired. Uracil is also introduced into DNA via nonmutagenic incorporation of dUTP during replication. In bacteria, uracil is ...

    Cytosine deamination is a major promutagenic process, generating G:U mismatches that can cause transition mutations if not repaired. Uracil is also introduced into DNA via nonmutagenic incorporation of dUTP during replication. In bacteria, uracil is excised by uracil-DNA glycosylases (UDG) related to E. coli UNG, and UNG homologs are found in mammals and viruses. Ung knockout mice display no increase in mutation frequency due to a second UDG activity, SMUG1, which is specialized for antimutational uracil excision in mammalian cells. Remarkably, SMUG1 also excises the oxidation-damage product 5-hydroxymethyluracil (HmU), but like UNG is inactive against thymine (5-methyluracil), a chemical substructure of HmU. We have solved the crystal structure of SMUG1 complexed with DNA and base-excision products. This structure indicates a more invasive interaction with dsDNA than observed with other UDGs and reveals an elegant water displacement/replacement mechanism that allows SMUG1 to exclude thymine from its active site while accepting HmU.

    Organizational Affiliation: 

    Cancer Research UK DNA Repair Enzyme Group, Section of Structural Biology, The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SINGLE-STRAND SELECTIVE MONOFUNCTIONAL URACIL DNA GLYCOSYLASE
A, B
247Xenopus laevisMutation(s): 0 
Gene Names: smug1
EC: 3.2.2.-
Find proteins for Q9YGN6 (Xenopus laevis)
Go to UniProtKB:  Q9YGN6
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*CP*CP*CP*GP*TP*GP*AP*GP*TP*CP*CP*G)-3'E12N/A
Entity ID: 3
MoleculeChainsLengthOrganism
5'-D(*CP*GP*GP*AP*CP*TP*3DR*AP*CP*GP*GP*G)-3'F12N/A
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL
Download SDF File 
Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
IPA
Query on IPA
Download SDF File 
Download CCD File 
B
ISOPROPYL ALCOHOL
2-PROPANOL
C3 H8 O
KFZMGEQAYNKOFK-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
3DR
Query on 3DR
F
DNA LINKINGC5 H11 O6 P

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.177 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 121.681α = 90.00
b = 85.936β = 118.36
c = 79.126γ = 90.00
Software Package:
Software NamePurpose
SOLVE/RESOLVEphasing
SCALAdata scaling
MOSFLMdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-07-11
    Type: Initial release
  • Version 1.1: 2013-07-17
    Type: Atomic model, Database references, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance