Theoretica chimica acta

, Volume 48, Issue 2, pp 143–153 | Cite as

A quantum-mechanical study of the interaction of glyoxal with guanine

  • Daniel Demoulin
  • Anne-Marie Armbruster
  • Bernard Pullman
Original Investigations


A quantum molecular study by the SCFab initio method of the interaction of glyoxal with guanine provides for the formation of a stable covalent adduct in which the glyoxal fragment forms a complementary cyclic ring attached to the imino N1 and amino N2 atoms of guanine with the concomitant migration of the N-bonded H atoms to the oxygens of glyoxal. The reaction should proceed in two steps. The most plausible mechanism involves as the first step the interaction of a carbonyl group of glyoxal with the amino group of guanine followed by a similar interaction at the imino group of guanine, rather than the reverse order of interactions. The respective energy barriers are 49.7 and 63.9 kcal/mole. The intermediate product is also more stable when the adduct occurs first at N2:30.7 kcal/mole versus 17.9 kcal/mole for the adduct at N1.

Key words

Glyoxal, interaction of ∼ with guanine 


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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • Daniel Demoulin
    • 1
  • Anne-Marie Armbruster
    • 1
  • Bernard Pullman
    • 1
  1. 1.Institut de Biologie Physico-ChimiqueNational Foundation for Cancer Research, Regional WorkshopParisFrance

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