Nucleic Acids Research, Vol 26, Issue 3 715-720, Copyright © 1998 by Oxford University Press
B Armitage, T Koch, H Frydenlund, H Orum and GB Schuster
Peptide nucleic acids (PNA) mimic DNA and RNA by forming complementary
duplex structures following Watson-Crick base pairing. A set of reporter
compounds that bind to DNA by intercalation are known, but these compounds
do not intercalate in PNA/DNA hybrid duplexes. Analysis of the hybrid PNA
duplexes requires development of reporter compounds that probe their
chemical and physical properties. We prepared a series of anthraquinone
(AQ) derivatives that are linked to internal positions of a PNA oligomer.
These are the first non-nucleobase functional groups that have been
incorporated into a PNA. The resulting PNA(AQ) conjugates form stable
hybrids with complementary DNA oligomers. We find that when the AQ groups
are covalently bound to PNA that they stabilize the hybrid duplex and are,
at least partially, intercalated.
ARTICLES
Peptide nucleic acid (PNA)/DNA hybrid duplexes: intercalation by an internally linked anthraquinone
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA.
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