Effect of DNA polymerase I and DNA helicase II on the turnover rate of UvrABC excision nuclease

Proc Natl Acad Sci U S A. 1985 Oct;82(20):6774-8. doi: 10.1073/pnas.82.20.6774.


UvrABC excision nuclease (UvrA, UvrB, and UvrC proteins) of Escherichia coli removes nucleotide mono- and diadducts from DNA in the form of oligonucleotides 12 or 13 bases long. We find that the purified enzyme dissociates from DNA very slowly, if at all, in the absence of other proteins implicated in excision repair. Addition of DNA polymerase I and helicase II (UvrD protein) to the reaction mixture stimulates the turnover rate of the excision nuclease to a level comparable to that observed in vivo.

Publication types

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

MeSH terms

  • Adenosine Triphosphatases / metabolism*
  • DNA Helicases*
  • DNA Polymerase I / metabolism*
  • DNA Repair
  • Endodeoxyribonucleases / metabolism*
  • Escherichia coli / enzymology*
  • Escherichia coli / genetics
  • Escherichia coli Proteins*
  • Kinetics
  • Models, Genetic


  • Escherichia coli Proteins
  • DNA Polymerase I
  • Endodeoxyribonucleases
  • endodeoxyribonuclease uvrABC
  • Adenosine Triphosphatases
  • UvrD protein, E coli
  • DNA Helicases