Group I Intron Internal Guide Sequence Binding Strength as a Component of Ribozyme Network Formation

Area of Science:

• Origins-of-life research
• Prebiotic chemistry
• Molecular evolution

Background:

• Life's origins necessitate understanding the transition from simple chemicals to self-replicating macromolecules.
• Ribozymes, RNA molecules with catalytic activity, are key candidates for early biological functions.
• Previous work demonstrated group I intron ribozymes can facilitate the synthesis of other ribozymes via recombination.

Purpose of the Study:

• To investigate the thermodynamic basis of molecular interactions in early RNA systems.
• To quantify the binding strength between specific RNA fragments involved in autocatalytic synthesis.
• To correlate binding thermodynamics with the catalytic efficiency of ribozymes.

Main Methods:

• Simplified recombination reactions between group I intron RNA fragments.
• Utilized fluorescent anisotropy to measure thermodynamic binding strength (K_D).
• Analyzed all 16 possible genotype combinations for a 3-nucleotide internal guide sequence (IGS) interaction.

Main Results:

• Quantified the binding affinity between complementary RNA fragments.
• Demonstrated a correlation between the binding strength (K_D) of the IGS and its complement and the ribozyme's catalytic ability.
• Provided thermodynamic data for specific RNA-RNA interactions.

Conclusions:

• The thermodynamic properties of RNA-RNA binding are linked to functional catalytic activity.
• This study provides a foundation for understanding the thermodynamic basis of information storage in prebiotic RNA.
• Insights into molecular recognition and catalysis are crucial for origins-of-life research.