High-Throughput Mutational Analysis of a Twister Ribozyme

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Ribozymes are RNA molecules with catalytic activity.
• Studying ribozyme mutants is crucial for understanding their function and engineering new ones.
• Current methods for analyzing ribozyme mutants are limited by the need for individual preparation and assays.

Purpose of the Study:

• To comprehensively analyze the functional impact of all single and double mutations in a twister ribozyme.
• To assess the robustness of the twister ribozyme against extensive mutagenesis.
• To identify structural elements within the ribozyme that are sensitive to mutations.

Main Methods:

• Generation of all possible single and double mutants of a twister ribozyme, totaling 10,296 mutants.
• Assay of self-cleaving activity for each mutant.
• Utilizing deep sequencing to quantify cleaved and uncleaved RNA sequences for high-throughput analysis.

Main Results:

• The twister ribozyme demonstrates significant robustness against mutations.
• 71% of single mutants and 30% of double mutants retained detectable self-cleaving activity.
• Different structural regions of the ribozyme showed varying sensitivities to mutations.

Conclusions:

• The twister ribozyme is remarkably tolerant to a wide range of mutations.
• Deep sequencing is an effective high-throughput method for ribozyme mutant analysis.
• Understanding mutation sensitivity provides insights into ribozyme structure-function relationships.