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Updated: Jul 9, 2026

Fluorescent End-Labeling and Encapsulation of Long RNAs for Single-Molecule FRET-TIRF Microscopy
Published on: October 18, 2024
Synthesis of pyrene labeled RNA for fluorescence measurements
Taewoo Kwon1, Nelly Piton, Christian Grünewald
1Institut für Organische Chemie und Chemische Biologie (OCCB), Johann Wolfgang Goethe-Universität, Max-von-Laue Strasse 7, D-60438 Frankfurt am Main, Germany.
Abstract:
The fluorophores 1-ethynylpyrene and 1-(p-ethynyl-phenylethynyl)-pyrene were attached to RNA through a Sonogashira cross-coupling with 5-iodocytidine either in solution through phosphoamidite synthesis or via on-column conjugation during solid-phase oligonucleotide synthesis. Six probes with the sequence 5'-CUU UUC UUU CUU-3' were derivatized with both fluorophores, whereby the position of the modified cytidine was varied. Fluorescence measurements showed sensitivity of the pyrene group to its environment in the single strands and corresponding duplexes.
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