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In vitro selection and characterization of streptomycin-binding RNAs: recognition discrimination between antibiotics
1Institute of Microbiology and Genetics, University of Vienna, Austria.
RNA (New York, N.Y.)
|January 22, 1998
Summary
Researchers identified RNA aptamers that bind the antibiotic streptomycin. One aptamer specifically binds streptomycin over a related compound, revealing insights into antibiotic-RNA interactions and drug resistance.
Area of Science:
- Molecular Biology
- Biochemistry
- Drug Discovery
Background:
- Antibiotic resistance necessitates understanding drug mechanisms.
- RNA is an emerging target for antibacterial and antiviral therapies.
- Streptomycin targets 16S ribosomal RNA and inhibits group I intron splicing.
Purpose of the Study:
- To elucidate the binding mechanism of streptomycin to RNA.
- To isolate high-affinity streptomycin-binding RNA aptamers.
- To differentiate binding specificity between streptomycin and its analogue bluensomycin.
Main Methods:
- In vitro selection and counter-selection to isolate RNA aptamers.
- Chemical probing (dimethylsulfate, kethoxal) to map drug-binding sites.
- Pb2+ cleavage assays to detect conformational changes upon drug binding.
Main Results:
- Isolated RNA aptamers with high affinity and specificity for streptomycin.
- Identified an RNA aptamer (motif 1) that discriminates between streptomycin and bluensomycin by four orders of magnitude.
- Determined minimal RNA sizes for binding and observed drug-induced conformational changes requiring Mg2+.
Conclusions:
- RNA aptamers can be selected for specific antibiotic binding.
- Understanding these interactions is key to developing new antibiotics.
- Magnesium ions are crucial for both RNA aptamer binding and streptomycin-induced conformational changes.