Rapid identification and characterization of hammerhead-ribozyme inhibitors using fluorescence-based technology

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Discovery

Background:

• Identifying small molecules that interact with RNA is crucial for clinical and research applications.
• Low-molecular-weight RNA-binding molecules show potential as therapeutic agents.
• Efficient technologies for discovering RNA-modulating compounds are increasingly important.

Purpose of the Study:

• To develop and apply a fluorescence-based assay for screening RNA modulators.
• To identify novel inhibitors of hammerhead ribozyme (HHR) catalysis.
• To characterize the activity of identified compounds in vitro and in vivo.

Main Methods:

• Screening a small library of antibiotic compounds using a fluorescence-based assay.
• Assessing modulators of hammerhead ribozyme (HHR) catalysis.
• Characterizing identified inhibitors, including Tuberactinomycin A, for cooperative inhibition and in vivo effects.
• Testing the assay's applicability to screening mixtures of compounds, such as actinomycete extracts.

Main Results:

• Several potent, previously unknown inhibitors of hammerhead ribozyme cleavage were identified.
• Tuberactinomycin A demonstrated positive cooperativity of inhibition in vitro and reduced ribozyme cleavage in vivo.
• The assay successfully detected inhibitory activities within a pool of 2,000 actinomycete extracts, demonstrating its ability to screen mixtures.

Conclusions:

• The developed fluorescence-based assay provides a rapid, reliable, and convenient method for identifying and characterizing ribozyme modulators.
• This approach facilitates the discovery of RNA-targeting small molecules with potential therapeutic applications.
• The methodology offers insights into ribozyme modulation that are challenging to obtain through traditional techniques.