PMID: 8960131Dec 2, 1996Paper

A common mechanism of action for the N-glycosylase activity of DNA N-glycosylase/AP lyases from E. coli and T4

Mutation Research
A A PurmalY W Kow

Abstract

Duplex oligonucleotides containing the base lesion analogs, O-methylhydroxylamine- and O-benzylhydroxylamine-modified abasic (AP) sites, were substrates for the DNA N-glycosylases endonuclease III, formamidopyrimidine DNA N-glycosylase and T4 endonuclease V. These N-glycosylases are known to have associated AP lyase activities. In contrast, uracil DNA N-glycosylase, a simple N-glycosylase which does not have an associated AP lyase activity, was unable to recognize the modified AP sites. Endonuclease III, formamidopyrimidine DNA N-glycosylase and T4 endonuclease V recognized the base lesion analogs as N-glycosylases generating intermediary AP sites which were subsequently cleaved by the enzyme-associated AP lyase activities. Kinetic measurements showed that O-alkoxyamine-modified AP sites were poorer substrates than the presumed physiological substrates. For endonuclease III, DNA containing O-methylhydroxyl-amine or O-benzylhydroxylamine was recognized at 12 and 9% of the rate of DNA containing thymine glycol, respectively, under subsaturating substrate concentrations (as determined by relative Vmax/K(m)). Similarly, with formamidopyrimidine DNA N-glycosylase and T4 endonuclease V. DNA containing O-methylhydroxylamine or O-benzy...Continue Reading

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Citations

Jun 2, 2005·Mutation Research·Bennett Van HoutenCaroline Kisker
Aug 2, 2003·DNA Repair·Dmitry O ZharkovArthur P Grollman
Oct 6, 2007·Nucleic Acids Research·Yoke W KowSteven D Goodman
Jun 29, 2000·Annual Review of Biochemistry·A K McCulloughR S Lloyd
Jul 15, 1998·Critical Reviews in Clinical Laboratory Sciences·H R GriffithsJ Lunec
Jul 8, 2000·The Journal of Biological Chemistry·D O ZharkovA P Grollman
Jul 15, 2020·DNA Repair·Katherine M Amidon, Brandt F Eichman
Feb 9, 2006·Chemical Reviews·James J TruglioCaroline Kisker

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