Characterization of novel cofactorless self-cleaving RNAs with activity at low pH

Area of Science:

• Biochemistry
• Molecular Biology
• RNA Therapeutics

Background:

• Diseases can alter cellular pH due to metabolic changes.
• Targeted drug delivery using genetic material could minimize side effects.
• Naturally occurring ribozymes are typically inactive at acidic pH.

Purpose of the Study:

• To develop a novel self-cleaving RNA active exclusively in acidic environments.
• To create a catalytic RNA that functions without divalent metal cations.
• To identify the minimal sequence required for acidic pH-dependent RNA cleavage.

Main Methods:

• In vitro selection assay was employed to isolate self-cleaving RNAs.
• Selection was performed under acidic conditions and in the absence of divalent metal ions.
• Functional RNAs were subsequently truncated to identify the catalytic core sequence.

Main Results:

• A novel functional RNA exhibiting self-cleavage activity solely at acidic pH was identified.
• The developed RNA demonstrated high catalytic activity independent of divalent metal ions.
• The essential sequence for catalytic activity was determined, yielding a 53-nucleotide RNA.

Conclusions:

• A novel, acid-specific, metal-ion-independent self-cleaving RNA was successfully engineered.
• This RNA holds promise for developing targeted therapeutic agents in acidic disease microenvironments.
• The study identified the minimal RNA sequence responsible for this unique catalytic function.