title: Mechanism of DNA strand nicking at apurinic/apyrimidinic sites by Escherichia coli [formamidopyrimidine]DNA glycosylase.
abstract: Escherichia coli [formamidopyrimidine]DNA glycosylase catalyses the nicking of both the phosphodiester bonds 3' and 5' of apurinic or apyrimidinic sites in DNA so that the base-free deoxyribose is replaced by a gap limited by 3'-phosphate and 5'-phosphate ends. The two nickings are not the results of hydrolytic processes; the [formamidopyrimidine]DNA glycosylase rather catalyses a beta-elimination reaction that is immediately followed by a delta-elimination. The enzyme is without action on a 3'-terminal base-free deoxyribose or on a 3'-terminal base-free unsaturated sugar produced by a beta-elimination reaction nicking the DNA strand 3' to an apurinic or apyrimidinic site.
authors.affiliation: Laboratoire de Biochimie, Faculté des Sciences, Université de Liège, Belgium.
authors.forename: V
authors.initials: V
authors.lastname: Bailly
authors.forename: W G
authors.initials: WG
authors.lastname: Verly
authors.forename: T
authors.initials: T
authors.lastname: O'Connor
authors.forename: J
authors.initials: J
authors.lastname: Laval
mesh_terms: D001080:Apurinic Acid; D004247:DNA / Q000187:drug effects*; D004249:DNA Damage; D043382:DNA-Formamidopyrimidine Glycosylase; D004926:Escherichia coli / Q000201:enzymology*; D029968:Escherichia coli Proteins; D009699:N-Glycosyl Hydrolases / Q000494:pharmacology*; D011119:Polynucleotides
chemical_list: D029968:Escherichia coli Proteins; D011119:Polynucleotides; C001790:apyrimidinic acid; D001080:Apurinic Acid; D004247:DNA; D009699:N-Glycosyl Hydrolases; D043382:DNA-Formamidopyrimidine Glycosylase; C468610:DNA-formamidopyrimidine glycosylase, E coli