Introduction of cationic charge into DNA near the major groove edge of a guanine•cytosine base pair: Characterization of oligodeoxynucleotides substituted with 7-aminomethyl-7-deaza-2′-deoxyguanosine

Manjori Ganguly, Ruo Wen Wang, Luis A. Marky, Barry Gold

Research output: Contribution to journalArticle

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(Figure Presented) The replacement of the 7-N atom on guanine (G) with a C-H to give 7-deazaguanine (c7G) alters the electronic properties of the heterocyclic base and eliminates a potential major groove cation binding site, which affects the organization of salts and water in the major groove. This has a destabilizing effect on DNA. We report herein the characterization of DNA oligomers containing 7-(aminomethyl)-7-deazaguanine (1) residues using a variety of spectroscopic and thermodynamic approaches. 1 is an intramolecular model for the major groove binding of cations and basic amino acid residues to G. In contrast to c7G, the tethering of a cation in the major groove using 1 affords DNA that is as, or more, stable than the corresponding unmodified DNA. The stabilization is associated with the folding enthalpy and hydration.

Original languageEnglish (US)
Pages (from-to)12068-12069
Number of pages2
JournalJournal of the American Chemical Society
Issue number34
StatePublished - Sep 2 2009


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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