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Kinetic Screening of Nuclease Activity using Nucleic Acid Probes
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Two-dimensional combinatorial screening identifies specific aminoglycoside-RNA internal loop partners.

Matthew D Disney1, Lucas P Labuda, Dustin J Paul

  • 1Department of Chemistry, University at Buffalo, The State University of New York, and the New York State Center of Excellence in Bioinformatics and Life Sciences, 657 Natural Sciences Complex, Buffalo, New York 14260, USA. mddisney@buffalo.edu

Journal of the American Chemical Society
|July 26, 2008
PubMed
Summary
This summary is machine-generated.

This study identifies specific RNA internal loops that bind to aminoglycoside antibiotics like neomycin B and tobramycin using a novel two-dimensional combinatorial screening platform. The findings reveal distinct RNA loop structures preferred by different aminoglycosides, enhancing understanding of RNA-ligand interactions.

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Area of Science:

  • Molecular Biology
  • Chemical Biology
  • Biochemistry

Background:

  • Aminoglycoside antibiotics are crucial for treating bacterial infections.
  • Understanding RNA-ligand interactions is key to developing new therapeutics.
  • Specific RNA internal loops can bind to small molecules, influencing biological activity.

Purpose of the Study:

  • To identify specific RNA internal loop sequences that bind to derivatives of neomycin B, neamine, tobramycin, and kanamycin A.
  • To characterize the binding specificities between these aminoglycosides and RNA internal loops.
  • To demonstrate the utility of the two-dimensional combinatorial screening (2DCS) platform for RNA-ligand discovery.

Main Methods:

  • Utilized a two-dimensional combinatorial screening (2DCS) platform.
  • Employed an aminoglycoside library immobilized on an agarose microarray.
  • Probed binding against a library of 3x3 nucleotide RNA internal loops (81,920 interactions).
  • Harvested bound RNAs via gel excision for analysis.

Main Results:

  • Identified consensus RNA internal loops for neomycin derivative (GA pairs), tobramycin derivative (GG pairs), and kanamycin A derivative (pyrimidine-rich loops).
  • Neamine derivative showed broad binding, including loops also recognized by neomycin B derivative.
  • Selected internal loops demonstrated high specificity for their cognate aminoglycosides, with specificities ranging from 2- to 80-fold (average 20-fold).

Conclusions:

  • The 2DCS platform effectively identifies specific RNA motif-ligand interactions by simultaneously probing RNA and chemical spaces.
  • Distinct RNA internal loop structures are associated with specific aminoglycoside binding.
  • This work provides a foundation for designing RNA-targeted therapeutics and understanding aminoglycoside-RNA interactions.