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• W2018011792 abstract "Guanine and its naturally or xenobiotically modified derivatives occur widely in nucleic acids and other natural products, yet the potential applications of tandem mass spectrometry in structural studies is limited by the complexity of dissociation pathways of the guanine nucleus. The low energy-collision induced dissociation (CID) of protonated guanine has been studied using analogs independently labeled with 15N at each of the five nitrogen atoms and by 18O at position 6. Following activation under multi-collision conditions, protonated guanine dissociates along two major pathways starting with expulsion of either NH3 or cyanamide. The reactions are rationalized in terms of initial opening of the pyrimidine ring, which results in loss of identity of ring atom N-1 and exocyclic N2. The equivalence of N-1 and N6 is retained under low energy (single collision) conditions, and upon methyl substitution at either nitrogen atom. Other reactions show the pyrimidine ring rather than the imidazole moiety to be the principal site of reactivity, analogous to the dissociation chemistry of protonated adenine." @default.
• W2018011792 created "2016-06-24" @default.
• W2018011792 creator A5023560928 @default.
• W2018011792 creator A5024516831 @default.
• W2018011792 date "1997-11-01" @default.
• W2018011792 modified "2023-10-17" @default.
• W2018011792 title "Collision-induced dissociation of protonated guanine" @default.
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• W2018011792 doi "https://doi.org/10.1016/s0168-1176(97)00163-8" @default.
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