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Solution structure of the tobramycin-RNA aptamer complex

L Jiang1, D J Patel

  • 1Cellular Biochemistry & Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.

Nature Structural Biology
|September 10, 1998
PubMed
Summary

Researchers elucidated the structure of tobramycin, an antibiotic, bound to an RNA aptamer. This binding involves the RNA aptamer forming a specific pocket to anchor the tobramycin antibiotic.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • RNA Therapeutics

Background:

  • Aminoglycoside antibiotics, like tobramycin, are crucial in combating bacterial infections.
  • RNA aptamers are increasingly recognized for their potential in targeted drug delivery and therapeutic applications.
  • Understanding the molecular interactions between antibiotics and RNA is vital for developing novel therapeutic strategies.

Purpose of the Study:

  • To determine the high-resolution solution structure of the tobramycin-RNA aptamer complex.
  • To elucidate the specific binding mechanism and interactions responsible for the high affinity and specificity of tobramycin to the RNA aptamer.
  • To provide a structural basis for the design of new RNA-targeted therapeutics.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to solve the solution structure.
  • Detailed analysis of base pairing, hydrogen bonding, and conformational changes in the RNA aptamer upon tobramycin binding.
  • Molecular modeling and visualization to interpret the complex structure.

Main Results:

  • The 14-base loop of the RNA aptamer undergoes a conformational change, 'zippering up' with the stem.
  • Tobramycin binds within the deep groove of the RNA, interacting with mismatched base pairs.
  • A looped-out guanine base partially encapsulates the antibiotic, forming a specific binding pocket.
  • Multiple intermolecular hydrogen bonds anchor tobramycin to the RNA via its amino groups and acceptor atoms on bases and backbone.

Conclusions:

  • The study reveals a unique RNA aptamer structure that forms a specific binding pocket for tobramycin.
  • The detailed structural insights explain the sequence and structure-specific recognition of tobramycin by the RNA aptamer.
  • This work lays the foundation for designing RNA-based aptamers for targeted delivery or modulation of aminoglycoside antibiotics.

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