Denaturation of nucleic acids induced by intercalating agents. Biochemical and biophysical properties of acridine orange-DNA complexes.

Abstract:

:At high binding densities acridine orange (AO) forms complexes with ds DNA which are insoluble in aqueous media. These complexes are characterized by high red- and minimal green-luminescence, 1:1 (dye/P) stoichiometry and resemble complexes of AO with ss nucleic acids. Formation of these complexes can be conveniently monitored by light scatter measurements. Light scattering properties of these complexes are believed to result from the condensation of nucleic acids induced by the cationic, intercalating ligands. The spectral and thermodynamic data provide evidence that AO (and other intercalating agents) induces denaturation of ds nucleic acids; the driving force of the denaturation is high affinity and cooperativity of binding of these ligands to ss nucleic acids. The denaturing effects of AO, adriamycin and ellipticine were confirmed by biochemical studies on accessibility of DNA bases (in complexes with these ligands) to the external probes. The denaturing properties of AO vary depending on the primary structure (sugar- and base-composition) of nucleic acids.

journal_name

J Biomol Struct Dyn

authors

Kapuscinski J,Darzynkiewicz Z

doi

10.1080/07391102.1984.10507532

subject

Has Abstract

pub_date

1984-06-01 00:00:00

pages

1485-99

issue

6

eissn

0739-1102

issn

1538-0254

journal_volume

1

pub_type

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