MP2 and DFT studies of the DNA rare base pairs: The molecular mechanism of the spontaneous substitution mutations conditioned by tautomerism of bases

Victor I. Danilov, Victor M. Anisimov, Noriyuki Kurita, Dmytro Hovorun

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated structures and electronic properties of DNA base pairs containing the lactim forms of guanine (G*) or thymine (T*) as well as the imino forms of cytosine (C*) or adenine (A*) by ab initio MP2 and DFT methods. The found stable structures of G*-T and G-T* base pairs are the nonplanar ones. The obtained formation energies indicate that G*-T and A-C* are more favorable than G-T* and A*-C. The nature of their hydrogen bonding was discussed based on the energy decomposition analysis of Morokuma-Kitaura and the reduced-variational-space methods to elucidate the possibility of the tautomerization of DNA base pairs.

Original languageEnglish (US)
Pages (from-to)285-293
Number of pages9
JournalChemical Physics Letters
Volume412
Issue number4-6
DOIs
StatePublished - Sep 5 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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