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Related Experiment Videos

RNA aptamers that specifically bind to a 16S ribosomal RNA decoding region construct.

J B Tok1, J Cho, R R Rando

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 45 Shattuck Street, Boston, MA 02115, USA.

Nucleic Acids Research
|July 25, 2000
PubMed
Summary

Researchers selected RNA aptamers that bind to the 16S rRNA A-site, a key region for translation. The tightest binding aptamer, 109.2-3, uses a loop-loop "kissing" motif for Watson-Crick base pairing.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA-RNA recognition is vital for biological processes like translation.
  • Interactions can occur via Watson-Crick base pairing or tertiary structures.
  • Understanding in vitro selection of RNA-RNA binding is crucial.

Purpose of the Study:

  • To investigate RNA-RNA binding events selected in vitro.
  • To identify RNA aptamers that bind to the 16S rRNA A-site.
  • To elucidate the binding mechanism between aptamers and the 16S rRNA A-site.

Main Methods:

  • In vitro selection from RNA libraries.
  • Characterization of aptamer-rRNA interactions.
  • Site-directed mutagenesis to probe binding mechanisms.

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Main Results:

  • A single family of RNA aptamers was selected from two library sizes.
  • The aptamer 109.2-3 showed tight binding to the 16S rRNA A-site.
  • Binding involved complementary stem-loop regions, suggesting a loop-loop 'kissing' interaction via Watson-Crick base pairing.

Conclusions:

  • RNA aptamer 109.2-3 specifically binds the 16S rRNA A-site through a loop-loop 'kissing' motif.
  • Watson-Crick base pairing in stem-loop regions mediates this high-affinity interaction.
  • Other structural motifs in the decoding region did not exhibit high-affinity binding.