DNA lesion bypass polymerases open up

Structure. 2001 Sep;9(9):759-64. doi: 10.1016/s0969-2126(01)00646-3.

Abstract

Structures of catalytic fragments of two DNA lesion bypass DNA polymerases, yeast DNA polymerase eta and an archeon DinB homolog, have recently been solved. These structures share several common architectural and structural features observed in other DNA polymerases, including a hand-like architecture with fingers, palm, and thumb subdomains. The new structures provide the first structural insights into DNA lesion bypass. The fingers and thumb are smaller than those in other DNA polymerases. Modeled substrates suggest that the fingers in the vicinity of the incoming nucleotide is closed, a conformation not previously observed for an unliganded polymerase. However, the template binding pocket appears to be more open, indicating that for DNA polymerase eta, a covalently linked thymine-thymine dimer could be accommodated.

Publication types

  • Review

MeSH terms

  • Archaeal Proteins*
  • DNA-Directed DNA Polymerase / chemistry*
  • DNA-Directed DNA Polymerase / metabolism*
  • Humans
  • Models, Molecular
  • Protein Binding
  • Protein Structure, Tertiary
  • Structure-Activity Relationship
  • Substrate Specificity

Substances

  • Archaeal Proteins
  • DNA polymerase mu
  • Dbh protein, Sulfolobus solfataricus
  • DNA-Directed DNA Polymerase