Nucleotide excision repair

Photochem Photobiol. 1993 May;57(5):905-21. doi: 10.1111/j.1751-1097.1993.tb09233.x.


Nucleotide excision repair is the major DNA repair mechanism in all species tested. This repair system is the sole mechanism for removing bulky adducts from DNA, but it repairs essentially all DNA lesions, and thus, in addition to its main function, it plays a back-up role for other repair systems. In both pro- and eukaryotes nucleotide excision is accomplished by a multisubunit ATP-dependent nuclease. The excision nuclease of prokaryotes incises the eighth phosphodiester bond 5' and the fourth or fifth phosphodiester bond 3' to the modified nucleotide and thus excises a 12-13-mer. The excision nuclease of eukaryotes incises the 22nd, 23rd, or 24th phosphodiester bond 5' and the fifth phosphodiester bond 3' to the lesion and thus removes the adduct in a 27-29-mer. A transcription repair coupling factor encoded by the mfd gene in Escherichia coli and the ERCC6 gene in humans directs the excision nuclease to RNA polymerase stalled at a lesion in the transcribed strand and thus ensures preferential repair of this strand compared to the nontranscribed strand.

Publication types

  • Research Support, U.S. Gov't, P.H.S.
  • Review

MeSH terms

  • Animals
  • Bacteria / genetics
  • Bacteria / radiation effects
  • DNA Damage*
  • DNA Helicases / genetics
  • DNA Helicases / metabolism
  • DNA Repair Enzymes
  • DNA Repair*
  • DNA-Directed RNA Polymerases / metabolism
  • Escherichia coli / genetics
  • Escherichia coli / radiation effects
  • Genes, Bacterial
  • Genes, Fungal
  • Humans
  • Poly-ADP-Ribose Binding Proteins
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / radiation effects
  • Ultraviolet Rays


  • Poly-ADP-Ribose Binding Proteins
  • DNA-Directed RNA Polymerases
  • DNA Helicases
  • ERCC6 protein, human
  • DNA Repair Enzymes