NDLI: Fluorescence Properties of Intercalating Neutral Chromophores in Complexes with Polynucleotides of Various Base Compositions and Secondary Structures

Content Provider	Springer Nature Link
Author	Zozulya, Victor
Copyright Year	1999
Abstract	Changes in the relative quantum yield and polarization degree of steady-state fluorescence of daunomycin (DM) on its binding to six synthetic single- and double-stranded polynucleotides of various nucleotide compositions were measured over a wide range of molar polymer-to-dye ratios, in solutions of low ionic strength. Guanine base was found to be an effective quencher of DM fluorescence [in the DM–poly(G) complex the intensity of residual emission was ~0.5% of the free dye intensity]. The quenching of DM fluorescence by another purine base, i.e., adenine, was also revealed. But, unlike guanine, adenine exhibits quenching activity when it is in close contact with the DM chromophore, as realized in the complex with single-stranded poly(A). In intercalative complexes with double-stranded nucleic acids, where such contact is lacking, the quenching ability of adenine does not manifest itself, which has been demonstrated with the DM–poly(A) · poly(U) complex. It was found that the interaction with pyrimidine bases does not substantially change the DM quantum yield. The quenching feature of DM fluorescence is identical to that observed earlier by us for a glycoside phenazine dye containing, like DM, a neutral chromophore.
Starting Page	363
Ending Page	366
Page Count	4
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	9
Issue Number	4
e-ISSN	15734994
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	1999-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biochemistry Biophysics/Biomedical Physics
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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