Abstract
We describe two new fluorescence resonance energy transfer (FRET) compatible labels, their covalent linkage to oligonucleotides, and their use as donor and acceptor, respectively, in FRET hybridization studies. The dyes belong to the cyanine dyes, and water solubility is imparted by a phosphonate which represents a new solubilizing group in DNA labels. They were linked to amino-modified synthetic oligonucleotides via oxysuccinimide (OSI) esters. The studies performed include binding assays, determinations of molecular distances, homogeneous competitive assays, and limits of detection, which are in the order of 5 pmol/L for a 15-mer.
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Abbreviations
- BCBS:
-
bicarbonate buffer solution, 50 mM, pH 9
- DCC:
-
dicyclohexylcarbodiimide
- DCM:
-
dichloromethane
- FRET:
-
fluorescence resonance energy transfer
- NHS:
-
N-hydroxysuccinimide
- OSI:
-
oxysuccinimidyl
- PBS:
-
phosphate-buffered saline, 22 mM, pH 7.2
- trisacetate buffer:
-
50 mM, pH 7.2 with 25 mM NaCl
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Gruber, M., Wetzl, B., Oswald, B. et al. A New Fluorescence Resonance Energy Transfer Pair and Its Application to Oligonucleotide Labeling and Fluorescence Resonance Energy Transfer Hybridization Studies. J Fluoresc 15, 207–214 (2005). https://doi.org/10.1007/s10895-005-2619-y
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DOI: https://doi.org/10.1007/s10895-005-2619-y