RNA ligase ribozymes with a small catalytic core

Area of Science:

• Biochemistry
• Origin of Life Studies
• Molecular Biology

Background:

• Catalytic RNAs (ribozymes) are crucial for chemical reactions and the hypothetical RNA world.
• Natural and evolved ribozymes often feature complex structures, which may not represent early life's chemical evolution.

Purpose of the Study:

• To investigate simple and small ribozyme motifs capable of template-directed RNA ligation.
• To explore the possibility of minimal RNA structures catalyzing essential biochemical reactions.

Main Methods:

• One-round selection process for small ligase ribozymes.
• Deep sequencing to identify functional ribozyme motifs.
• Assay of catalytic activity and linkage formation.

Main Results:

• Identification of a small ligase ribozyme motif with a three-nucleotide loop.
• Demonstration of magnesium(II)-dependent ligation activity.
• Observation of 2'-5' phosphodiester bond formation.

Conclusions:

• Simple, small RNA motifs can possess catalytic ligation activity.
• These findings support the role of RNA in early chemical evolution.
• Minimal RNA structures could have been foundational for life's origins.