ArticlePloS one2024
A method to measure molecular hybridization.
Article in PloS one, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Fluorescence-based oligonucleotide probes have a great importance in research of molecular interactions. Molecular beacons (MBs) are special case of fluorescent probes that form a stem-loop shape, bringing together a fluorophore and quencher, thus emitting fluorescence only when hybridized to a complementary target. Here we describe a new method for the quantitation of MB hybridization based on the measurement of changes in free energy instead of the fluorescence intensity. The MB energy state can be measured by micro-fluorescence detection. The approach allowed to determine hybridization energy of the MB with target nucleotide directly from fluorescence spectra and distinguish the MB in unfolded and hybridized states. Moreover, the method enabled us to discriminate between DNA duplexes with perfect complementarity or a single-nucleotide mismatch, based on the first direct experimental prove of enthalpy-entropy compensation.
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