Abstract
A new combined solid-liquid phase synthesis method for a spin labeled peptide nucleic acid (PNA) is developed. The methodology involved initial preparation of a protected PNA on solid phase, followed by efficient solution phase coupling to a spin label containing a reactive carboxylic group. This strategy allows to maintain the integrity of the nitroxide moiety during the various steps of chemical synthesis assuring in the same time the fidelity of the hybridization assay. This compound can be used as a reporter molecule to investigate the binding of peptide nucleic acids to oligonucleotide sequences (DNA or RNA) by EPR spectroscopy.
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