Nucleic Acids Research, 2002, Vol. 30, No. 9 2089-2195
© 2002 Oxford University Press
Effect of primary and secondary structure of oligodeoxyribonucleotides on the fluorescent properties of conjugated dyes
Invitrogen Corporation, 1620 Faraday Avenue, Carlsbad, CA 92008, USA
We studied fluorescence intensity, polarization and lifetime of some commonly used fluorophores conjugated to oligodeoxyribonucleotides with different primary and secondary structures. We found that fluorescence intensity can increase or decrease upon hybridization of the labeled strand to its complement depending on the sequence and position of the fluorophore. Up to 10-fold quenching of the fluorescence upon hybridization was observed when the dye moiety was attached close to the 3' end and the 3'-terminal base was either dG or dC. No quenching upon hybridization was observed when the dye was positioned within the same sequence context but close to the 5' end. The presence of a dG overhang quenches the fluorescence less efficiently than a blunt end dG-dC or dC-dG base pair. When located internally in the double strand, the dG-dC base pair does not affect the fluorescence of the nearby dye. Guanosine in a single-stranded oligonucleotide quenches the fluorescence of nearby dye by <2-fold. Upon duplex formation, this quenching is eliminated and the fluorescence increases. This increase can only be detected when the fluorophore is located at least 6 nt from the terminal dG-dC base pair. The change of fluorescence polarization upon duplex formation inversely correlates with the change of intensity. Fluorescein conjugated to a single-stranded oligonucleotide or a duplex undergoes a bi-exponential decay with 
4 and 1 ns lifetimes.
* To whom correspondence should be addressed at present address: MetriGenix, 708 Quince Orchard Road, Gaithersburg, MD 20878, USA. Tel: +1 301 987 1711; Fax: +1 301 987 1717; Email: inazarenko{at}metrigenix.com
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