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The Journal of Cell Biology, Vol 47, 500-511, Copyright © 1970 by Rockefeller University Press

ARTICLE

PHYSICAL CHEMICAL STUDIES ON THE SPECIFIC INTERACTION OF AN ACRIFLAVINE-PHOSPHOTUNGSTIC ACID COMPLEX WITH DOUBLE-STRANDED NUCLEIC ACIDS

Charles T. Ladoulis 1 and Thomas J. Gill III 1

1 From the Laboratory of Chemical Pathology, Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115

The detailed definition of the structure of DNA in chromosomes and in interphase chromatin is important for correlating the structure of the genetic material with various states of physiological activity. A general approach to developing specific reagents for a variety of such studies in solution and in tissues is to combine a chemically specific organic cation with the electron-opaque phosphotungstic acid (PTA) molecule. The reagent described in this paper was made from the interaction of acriflavine and phosphotungstic acid. The acriflavine-PTA complex (a) displays some unique absorption and fluorescence properties, (b) binds specifically to DNA and RNA by intercalation of the acriflavine moiety, and (c) is electron opaque. In addition, it binds to double-stranded synthetic polynucleotides, but not to a variety of proteins, nucleoproteins, or polysaccharides.

Submitted on December 15, 1969
Revised on April 9, 1970


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