Structure of a DNA glycosylase searching for lesions

Science. 2006 Feb 24;311(5764):1153-7. doi: 10.1126/science.1120288.

Abstract

DNA glycosylases must interrogate millions of base pairs of undamaged DNA in order to locate and then excise one damaged nucleobase. The nature of this search process remains poorly understood. Here we report the use of disulfide cross-linking (DXL) technology to obtain structures of a bacterial DNA glycosylase, MutM, interrogating undamaged DNA. These structures, solved to 2.0 angstrom resolution, reveal the nature of the search process: The protein inserts a probe residue into the helical stack and severely buckles the target base pair, which remains intrahelical. MutM therefore actively interrogates the intact DNA helix while searching for damage.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Base Pairing*
  • Binding Sites
  • Cross-Linking Reagents
  • Crystallography, X-Ray
  • DNA / chemistry*
  • DNA / metabolism
  • DNA Damage*
  • DNA Glycosylases / chemistry*
  • DNA Glycosylases / metabolism*
  • Geobacillus stearothermophilus / enzymology*
  • Guanine / analogs & derivatives*
  • Guanine / analysis
  • Guanine / metabolism
  • Hydrogen Bonding
  • Models, Molecular
  • Nucleic Acid Conformation
  • Oligodeoxyribonucleotides / chemistry
  • Oligodeoxyribonucleotides / metabolism
  • Protein Conformation
  • Protein Structure, Secondary

Substances

  • Cross-Linking Reagents
  • Oligodeoxyribonucleotides
  • 8-hydroxyguanine
  • Guanine
  • DNA
  • DNA Glycosylases

Associated data

  • PDB/2F5N
  • PDB/2F5O
  • PDB/2F5P
  • PDB/2F5Q
  • PDB/2F5S