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Aminoglycoside binding to human and bacterial A-Site rRNA decoding region constructs.

D H Ryu1, R R Rando

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.

Bioorganic & Medicinal Chemistry
|September 15, 2001
PubMed
Summary

Aminoglycoside antibiotics may not preferentially bind to bacterial RNA targets over human RNA. This study found minimal differences in binding affinity, suggesting broader implications for antibiotic development and targeting RNA structures.

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Area of Science:

  • Molecular Biology
  • Pharmacology
  • Microbiology

Background:

  • Aminoglycoside antibiotics are crucial antibacterial agents.
  • The 16S ribosomal RNA A-site is the established target for aminoglycosides in prokaryotes.
  • Clinical efficacy may depend on selective binding to prokaryotic versus eukaryotic A-sites.

Purpose of the Study:

  • To investigate the differential binding affinities of aminoglycosides to prokaryotic and eukaryotic A-site RNA constructs.
  • To explore the structural basis for aminoglycoside-RNA interactions.

Main Methods:

  • Quantitative binding experiments using prokaryotic and eukaryotic A-site RNA constructs.
  • Mutational analysis of RNA sequences to identify key structural elements for binding.

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Main Results:

  • Minimal differential binding affinities observed between prokaryotic and eukaryotic A-site RNA constructs for aminoglycosides.
  • Neomycin showed the largest, yet modest, 4-fold higher affinity for the prokaryotic A-site.
  • RNA constructs with non-Watson-Crick base pairing elements bound aminoglycosides with micromolar affinities.

Conclusions:

  • The hypothesis of preferential aminoglycoside binding to prokaryotic A-sites is not strongly supported by these findings.
  • Aminoglycoside antibiotics can bind to RNA structures with non-A form elements, facilitating access to the major groove.
  • Findings suggest potential for aminoglycoside activity against targets beyond the canonical ribosomal A-site, provided specific structural features are present.