title: DNA deoxyribophosphodiesterase.
abstract: A previously unrecognized enzyme acting on damaged termini in DNA is present in Escherichia coli. The enzyme catalyses the hydrolytic release of 2-deoxyribose-5-phosphate from single-strand interruptions in DNA with a base-free residue on the 5' side. The partly purified protein appears to be free from endonuclease activity for apurinic/apyrimidinic sites, exonuclease activity and DNA 5'-phosphatase activity. The enzyme has a mol. wt of approximately 50,000-55,000 and has been termed DNA deoxyribophosphodiesterase (dRpase). The protein presumably is active in DNA excision repair to remove a sugar-phosphate residue from an endonucleolytically incised apurinic/apyrimidinic site, prior to gap filling and ligation.
authors.affiliation: Imperial Cancer Research Fund, Clare Hall Laboratories, Hertfordshire, LD, UK.
authors.forename: W A
authors.initials: WA
authors.lastname: Franklin
authors.forename: T
authors.initials: T
authors.lastname: Lindahl
mesh_terms: D002499:Centrifugation, Density Gradient; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D004256:DNA Polymerase I / Q000378:metabolism; D004260:DNA Repair; D043224:Deoxyribonuclease (Pyrimidine Dimer); D004706:Endodeoxyribonucleases / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics; D007700:Kinetics; D010428:Pentosephosphates / Q000378:metabolism*; D010727:Phosphoric Diester Hydrolases / Q000235:genetics / Q000378:metabolism*; D012267:Ribosemonophosphates / Q000378:metabolism*
chemical_list: D010428:Pentosephosphates; D012267:Ribosemonophosphates; C058245:2-deoxyribose 5-phosphate; D004256:DNA Polymerase I; D004706:Endodeoxyribonucleases; D043224:Deoxyribonuclease (Pyrimidine Dimer); C058246:DNA deoxyribophosphodiesterase; D010727:Phosphoric Diester Hydrolases