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Updated: Jul 20, 2026

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Published on: August 20, 2014

Directed evolution of an RNA enzyme.

A A Beaudry¹, G F Joyce

¹Department of Chemistry, Scripps Research Institute, La Jolla, CA 92037.

Science (New York, N.Y.)

|July 31, 1992

Summary

Researchers evolved RNA enzymes, specifically the Tetrahymena ribozyme, to enhance their DNA cleavage ability. This in vitro evolution process resulted in a 100-fold increase in catalytic DNA cleavage under physiological conditions.

Area of Science:

Biochemistry
Molecular Biology
Enzyme Engineering

Background:

The Tetrahymena ribozyme, a group I ribozyme, catalyzes RNA cleavage via a phosphoester transfer mechanism.
This ribozyme exhibits limited DNA cleavage activity, typically requiring harsh conditions like high temperature or high MgCl2 concentration.

Purpose of the Study:

To develop RNA enzymes capable of efficient DNA cleavage under physiological conditions.
To enhance the catalytic DNA cleavage activity of the Tetrahymena ribozyme through in vitro evolution.

Main Methods:

An in vitro evolution strategy was employed using a population of 10(13) Tetrahymena ribozyme variants.
A selection constraint was applied to amplify ribozyme variants that cleaved DNA under physiological conditions.
Mutations were introduced during amplification over ten generations to maintain population diversity and drive evolution.

Keywords:

NASA Discipline Exobiology Non-NASA Center

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Main Results:

The in vitro evolution process successfully generated ribozyme variants with significantly enhanced DNA cleavage activity.
A 100-fold increase in DNA cleavage activity was observed under physiological conditions compared to the original ribozyme.

Conclusions:

In vitro evolution is an effective method for engineering RNA enzymes with novel or improved catalytic functions.
The evolved Tetrahymena ribozyme variants demonstrate potential for applications requiring sequence-specific DNA cleavage under mild conditions.