1H‐ and 13C‐nmr studies on caffeine and its interaction with nucleic acids

Lou‐sing ‐s Kan, Philip N. Borer, Doris M. Cheng, Paul O.P. Ts'o

Research output: Contribution to journalArticle

43 Scopus citations

Abstract

The relative orientation of caffeine in stacks formed by self‐association in aqueous solution has been evaluated by both 1H‐ and 13C‐nmr spectroscopy. The data, which were interpreted through the calculation of ring‐current and atomic diamagnetic anisotropic effects of the caffeine molecule, suggest two caffeine bases may stack in a nearly orthogonal manner. The interactions between caffeine and adenylyl‐3′,5′‐adenosine, polyadenylic acid, and ribo‐(A‐A‐G‐C‐U‐U)2 helix were also studied by nmr at different caffeine/base ratios and at varying temperatures. The results show that caffeine tends to stack on the top of the terminal purine bases or to insert (the single‐stranded) or to intercalate (the double‐stranded) between purine bases.

Original languageEnglish (US)
Pages (from-to)1641-1654
Number of pages14
JournalBiopolymers
Volume19
Issue number9
DOIs
StatePublished - Sep 1980

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Biomaterials
  • Organic Chemistry

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