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A modular, bifunctional RNA that integrates itself into a target RNA
Roshan M Kumar1, Gerald F Joyce
1Department of Chemistry, Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
Summary
Researchers engineered artificial enzymes by combining two RNA-cleaving and RNA-joining ribozymes. This bifunctional enzyme successfully integrates into target RNA, offering new tools for molecular biology and understanding enzyme evolution.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzyme Engineering
Background:
- Nature utilizes modular enzyme designs for complex functions.
- Artificial enzyme development has not extensively explored combining independent functional domains.
Purpose of the Study:
- To create and optimize a bifunctional artificial enzyme by joining a group I ribozyme (endoribonuclease) and an R3C ribozyme (ligase).
- To investigate the integration of conjoined ribozymes into a target RNA substrate.
- To explore the evolution of modular enzymes.
Main Methods:
- Conjoining a group I ribozyme and an R3C ribozyme.
- Employing in vitro evolution to enhance the activity of the bifunctional enzyme.
- Analyzing mutations in the optimized ribozyme subunit.
Main Results:
- The conjoined ribozymes, after in vitro evolution, demonstrated significantly improved RNA integration activity.
- The ligase subunit remained unchanged, while the group I ribozyme acquired peripheral mutations.
- The bifunctional enzyme successfully performed successive RNA cleavage and joining reactions for mutual integration.
Conclusions:
- Bifunctional artificial enzymes can be generated by combining independent catalytic domains.
- In vitro evolution is effective in overcoming challenges in substrate transfer between enzyme subunits.
- These engineered ribozymes serve as valuable tools for insertional mutagenesis of target mRNAs and offer insights into modular enzyme evolution.