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[A Study of Interaction of 7-aminoactinomycin D With DNA by Fluorescence Correlation Spectroscopy]

[A Study of Interaction of 7-aminoactinomycin D With DNA by Fluorescence Correlation Spectroscopy]

A E Kovalev, A A Iakovenko, N L Vekshin

Biofizika. Nov-Dec 2004;49(6):1030-7.

PMID: 15612543

Abstract:

The investigation of interaction of 7-aminoactinomycin D with DNA is hampered at nanomolar concentrations by low quantum yield of the dye fluorescence and high adsorbability of the dye. It was found that, instead of the increase in the fluorescence of 7-aminoactinomycin D after binding with DNA, a decrease in the fluorescence takes place, because 7-aminoactinomycin D complexed with DNA exists in two states: photochemically active and inactive. The presence of the photochemically active state of 7-aminoactinomycin D causes an apparent increase in the diffusion coefficient upon embedding of 7-aminoactinomycin D into DNA. The data obtained allow one to state that 7-aminoactinomycin D: (1) forms dimers at micromolar concentration, (2) has two specific photodestruction times, and (3) binds with DNA more effectively than actinomycin D. Polarization measurements made it possible to estimate numerically the adsorption of 7-aminoactinomycin D on the walls of the measuring cell.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7240371-A	7-Aminoactinomycin D		7240-37-1	Price

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