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Neomycin inhibition of the hammerhead ribozyme involves ionic interactions
B Clouet-d'Orval1, T K Stage, O C Uhlenbeck
1Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215, USA.
Biochemistry
|September 5, 1995
Summary
Neomycin inhibits hammerhead ribozyme activity through ionic interactions, requiring five magnesium ions to displace it. At least three positive charges on neomycin are essential for this hammerhead inhibition.
Area of Science:
- Biochemistry
- Molecular Biology
- RNA catalysis
Background:
- Hammerhead ribozymes are self-splicing RNA molecules.
- Aminoglycoside antibiotics, like neomycin, can interact with RNA structures.
Purpose of the Study:
- To elucidate the binding mechanism and inhibitory properties of neomycin on hammerhead ribozyme activity.
- To determine the role of magnesium ions and pH in the neomycin-hammerhead interaction.
Main Methods:
- Enzyme inhibition assays were performed.
- Hammerhead activity was measured across varying magnesium concentrations and pH levels.
Main Results:
- Neomycin inhibition is competitive with magnesium ions; approximately five magnesium ions are needed to displace neomycin.
- The pH dependence indicates that at least three positively charged ammonium groups on neomycin are crucial for inhibiting hammerhead function.
Conclusions:
- The neomycin-hammerhead interaction is primarily ionic.
- Understanding this interaction is key for RNA-targeted drug development.