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Related Experiment Videos

A functional pseudoknot in 16S ribosomal RNA.

T Powers1, H F Noller

  • 1Sinsheimer Laboratories, University of California, Santa Cruz 95064.

The EMBO Journal
|August 1, 1991
PubMed
Summary

The 530 loop of 16S ribosomal RNA is crucial for translation. Disrupting its structure, like creating G-U wobble pairs, can confer streptomycin resistance by reducing antibiotic affinity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The 530 loop of 16S ribosomal RNA is vital for translation, particularly tRNA binding to the ribosomal A site.
  • A proposed pseudoknot structure involves base pairing between residues 524-526 and 505-507 in the 16S rRNA.

Purpose of the Study:

  • To investigate the functional significance of Watson-Crick interactions within the 16S rRNA 530 loop pseudoknot.
  • To explore the relationship between structural perturbations in this region and streptomycin resistance.

Main Methods:

  • Site-directed mutagenesis to alter nucleotide interactions within the 530 loop.
  • Assessment of ribosomal function in vitro and in vivo.
  • Chemical probing to determine streptomycin binding affinity in mutant ribosomes.

Main Results:

  • Watson-Crick base pairing in the 530 loop is essential for proper ribosomal function.
  • Mild structural changes, such as G-U wobble pairs, lead to streptomycin resistance.
  • Mutant ribosomes exhibit reduced affinity for streptomycin, despite the drug's distinct binding site.

Conclusions:

  • The 16S rRNA 530 loop pseudoknot is critical for translation and antibiotic interaction.
  • Structural integrity of this region influences streptomycin sensitivity.
  • Ribosomal protein S12 likely stabilizes this pseudoknot structure.

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