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In vitro selection of a viomycin-binding RNA pseudoknot
M G Wallis1, B Streicher, H Wank
1Institute of Microbiology and Genetics University of Vienna Dr. Bohrgasse 9, A-1030, Vienna, Austria.
Chemistry & Biology
|May 1, 1997
Summary
Viomycin, an antibiotic, selectively binds to specific RNA pseudoknots. Researchers identified a conserved RNA motif crucial for viomycin binding, revealing the molecular basis for its action.
Area of Science:
- Molecular Biology
- Biochemistry
- RNA Biology
Background:
- Viomycin is a peptide antibiotic that inhibits crucial cellular processes like protein synthesis and RNA self-splicing.
- Its mechanism involves interaction with RNA molecules, including the human hepatitis delta virus ribozyme.
Purpose of the Study:
- To elucidate the molecular mechanisms of RNA recognition and binding by viomycin.
- To identify novel RNA structures that interact with viomycin.
Main Methods:
- In vitro selection (SELEX) was employed to isolate viomycin-binding RNA molecules.
- Structural probing, mutational analysis, and chemical footprinting were used to characterize the RNA-viomycin interaction.
Main Results:
- A highly conserved 14-nucleotide RNA motif was identified in over 90% of selected molecules.
- This motif forms a stem-loop structure with a pseudoknot, identified as the primary antibiotic-binding site.
- The conserved sequence and pseudoknot structure are essential for viomycin binding.
Conclusions:
- Viomycin exhibits strong selectivity for specific RNA pseudoknots.
- The identified RNA motif represents a key structural element for viomycin recognition and binding.
- This finding provides insight into the molecular basis of viomycin's antibiotic activity.