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Related Experiment Videos

High-resolution molecular discrimination by RNA

R D Jenison1, S C Gill, A Pardi

  • 1NeXagen, Inc., Boulder, CO 80301.

Science (New York, N.Y.)
|March 11, 1994
PubMed
Summary
This summary is machine-generated.

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Researchers discovered RNA molecules that specifically bind to the bronchodilator theophylline with high affinity. This finding highlights RNA

Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA Aptamer Technology

Background:

  • Theophylline is a bronchodilator drug with therapeutic applications.
  • Understanding specific molecular interactions is crucial for drug development and molecular recognition studies.
  • RNA molecules are known for diverse biological functions, but their potential as specific drug binders is an active area of research.

Purpose of the Study:

  • To identify RNA molecules with high affinity and specificity for theophylline.
  • To characterize the binding interaction between the selected RNA and theophylline.
  • To investigate the structural basis for the observed ligand recognition and discrimination by RNA.

Main Methods:

  • Systematic Evolution of Ligands by Exponential Enrichment (SELEX) was employed to select RNA molecules from an oligonucleotide library.

Related Experiment Videos

  • Equilibrium dialysis and surface plasmon resonance were used to determine binding affinities (dissociation constant, Kd).
  • Nuclear Magnetic Resonance (NMR) spectroscopy was utilized to analyze conformational changes upon ligand binding.

    • Main Results:

    • A specific RNA molecule was identified that binds theophylline with a dissociation constant (Kd) of 0.1 microM.
    • This RNA demonstrated a 10,000-fold greater affinity for theophylline compared to caffeine, highlighting significant specificity.
    • NMR analysis revealed substantial conformational or dynamic changes in the RNA upon theophylline binding, indicating an induced-fit mechanism.

    Conclusions:

    • RNA molecules can be selected to exhibit exceptionally high affinity and specificity for small molecule ligands like theophylline.
    • The identified RNA-theophylline interaction provides a model for understanding RNA-ligand recognition and discrimination.
    • These findings underscore the potential of RNA aptamers in therapeutic applications and as tools for chemical biology.