title: Hydroxylamine mutagenesis: observation of inverted Watson-Crick base-pairing between N4-methoxycytosine and adenine with the aid of natural-abundance high-resolution 15N NMR spectroscopy.
abstract: Natural-abundance high-resolution 15N NMR spectra have been recorded for 1-methyl-N4-methoxycytosine (the product of reaction of 1-methylcytosine with the mutagen methoxyamine), 2',3',5'-tri-O-methyladenosine, and a 1:1 mixture of the two, all in chloroform solution. The spectra were obtained by application of a sequence of impulses of the type referred to as insensitive nuclear enhancement by polarization transfer (INEPT). Assignments of all the nitrogen resonances were based on nitrogen-proton coupling constants and literature data. Analysis of the 15N chemical shifts demonstrated the formation of base pairs with hydrogen bonds involving the ring N(1) and an N6-H of adenine, and the N(3)-H and C(2) = O of N4-methoxycytosine, viz. N(1) . H-N(3) and N6-H . O2 = C. The hydrogen-bond-stabilized complex formed thus involves an inverse type of Watson-Crick base-pairing. The data excluded formation of Hoogsteen-type base-pairing. The results are considered in relation to hydroxylamine and methoxyamine mutagenesis, to types of base-pairing at the monomer and polymer levels, and to interpretations of 15N NMR spectra of heterocyclic rings in general.
mesh_terms: D000225:Adenine; D001482:Base Composition; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D003596:Cytosine / Q000031:analogs & derivatives*; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D009152:Mutagenicity Tests; D009153:Mutagens; D009587:Nitrogen Isotopes
chemical_list: D009153:Mutagens; D009587:Nitrogen Isotopes; C036689:N(4)-methoxycytosine; D003596:Cytosine; D000225:Adenine