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Nucleic Acids Research, 1975, Vol. 2, No. 8 1261-1274
© 1975

Articles

Fluorescence probing of nucleic acids: I. singly and doubly labeled dithymidine phosphate: fluorescence and energy transfer studies

Jacques Tournon

Groupe de Physique des Solides de l'Ecole Normale Supérieure Tour 23, 2 Place Jussieu, Paris 5e, France

Received April 25, 1975. Dithymidine phosphate labeled at its 5' end with a naphthalene-carbamate has been prepared, DTpT. It is shown to exist in several conformations which are characterized by chromatography and absorption and fluorescence measurements. Models for three possible conformers where the dye is solvated, stacked on the first thymine or intercalated between the two thymines are given with their absorption and fluorescence spectra. The doubly labeled molecule, DTpTA, where D and A form a donor-acceptor energy transfer pair has also been prepared. The energy transfer rate has been measured from the donor fluorescence lifetime decay.


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