title: Alkylation of guanosine and 2'-deoxyguanosine by o-quinone alpha-(p-anisyl)methide in aqueous solution.
abstract: Rates of alkylation of guanosine and 2'-deoxyguanosine with o-quinone alpha-(p-anisyl)methide were measured by flash photolysis in a series of aqueous sodium hydroxide solutions and bicarbonate ion, t-butylhydrogenphosphonate ion, and biphosphate ion buffers. The data so obtained provide rate profiles for these nucleoside plus quinone methide reactions over the range pH = 7-14, which furnish guanosine and deoxyguanosine acidity constants consistent with literature information. These profiles also provide rate constants that show the reaction of o-quinone alpha-(p-anisyl)methide with guanosine and deoxyguanosine to be fairly fast processes, considerably faster than the biologically wasteful reaction of the quinone methide with water, which is the ubiquitous medium in biological systems; that makes the quinone methide a potent guonosine and deoxyguanosine alkylator.
authors.affiliation: Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Chiang
authors.forename: A Jerry
authors.initials: AJ
authors.lastname: Kresge
mesh_terms: D000478:Alkylation; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000138:chemical synthesis*; D006151:Guanosine / Q000138:chemical synthesis*; D007700:Kinetics; D015394:Molecular Structure; D011809:Quinones / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D011809:Quinones; C450959:o-quinone-(p-anisyl)methide; D014867:Water; D006151:Guanosine; D003849:Deoxyguanosine