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Related Concept Videos

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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis
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Forced Intercalation (FIT)-Aptamers.

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    Researchers developed forced intercalation (FIT)-aptamers, a novel signaling aptamer class. These aptamers use a single modification to enable sensitive and specific fluorescence detection of various targets in complex biological samples.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Analytical Chemistry

    Background:

    • Aptamers are versatile oligonucleotide tools for analyte detection.
    • Existing aptamer signaling methods often suffer from false positives or limited dynamic range.

    Purpose of the Study:

    • To develop a general aptamer design strategy for robust fluorescence readout.
    • To create a new class of signaling aptamers with improved performance characteristics.

    Main Methods:

    • Utilized a viscosity-sensitive dye that intercalates into aptamer-target complexes.
    • Developed forced intercalation (FIT) aptamers that increase fluorescence upon target binding.
    • Demonstrated FIT-aptamer utility in various binding modes including conformational changes, sandwich assays, and split-aptamer reassociation.

    Main Results:

    • FIT-aptamers achieved up to a 20-fold increase in fluorescence upon target binding.
    • The strategy successfully detected metallo-base pair formation.
    • FIT-aptamers exhibited reduced false-positive signals compared to traditional systems.
    • Achieved high signal-to-background ratios (up to 15-fold higher than FRET) and nanomolar sensitivity in human serum.

    Conclusions:

    • FIT-aptamers represent a new class of signaling aptamers with a single modification.
    • This strategy enables sensitive and specific detection of diverse targets in complex media.
    • FIT-aptamers offer a promising alternative to existing aptamer-based detection methods.