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Neomycin dimers effectively target HIV-1 TAR RNA, showing higher binding affinity than neomycin alone. Linker modifications allow distinction between TAR RNA mutant structures, offering potential for HIV therapeutics.

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Area of Science:

  • Medicinal Chemistry
  • Virology
  • Molecular Biology

Background:

  • The Transactivation Response (TAR) RNA element is crucial for HIV-1 replication, interacting with the viral Tat protein.
  • Neomycin and its derivatives are being investigated as potential antiviral agents targeting viral RNA structures.

Purpose of the Study:

  • To synthesize and evaluate neomycin dimers with varying linker functionalities for targeting HIV-1 TAR RNA.
  • To investigate the binding affinities and mechanisms of neomycin dimers compared to neomycin against wildtype and mutant TAR RNA.

Main Methods:

  • Synthesis of neomycin dimers using click chemistry.
  • Ethidium bromide displacement and FRET competition assays to determine binding affinities.
  • Nuclear Magnetic Resonance (NMR) and Free Induction Decay (FID) spectroscopy for structural analysis.
  • Binding studies with four TAR RNA mutants exhibiting conformational differences.

Main Results:

  • Neomycin dimers exhibit nanomolar binding affinity to wildtype TAR RNA, significantly higher than neomycin alone.
  • NMR and FID analyses reveal an extended binding interface for neomycin dimers on the upper stem of TAR RNA.
  • Neomycin dimers demonstrate the ability to differentiate binding based on conformational variations in TAR RNA mutants.
  • Linker functionality in neomycin dimers influences their interaction with different TAR RNA structures.

Conclusions:

  • Neomycin dimers represent a promising class of compounds for targeting HIV-1 TAR RNA.
  • The observed enhanced binding affinity is attributed to an extended interaction interface.
  • Tailoring linker functionalities in neomycin dimers allows for specific recognition of conformational changes in TAR RNA, suggesting potential for selective antiviral strategies.