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Modified nucleotides may have enhanced early RNA catalysis.

Steven K Wolk1, Wesley S Mayfield1, Amy D Gelinas1

  • 1SomaLogic, Inc., Boulder, CO 80301.

Proceedings of the National Academy of Sciences of the United States of America
|April 2, 2020
PubMed
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Noncanonical ribonucleotides could have enabled shorter RNA molecules to perform catalytic functions, advancing the early stages of RNA self-replication. This research explores how modified bases may have facilitated the origin of life.

Keywords:
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Area of Science:

  • Origin of Life Research
  • Prebiotic Chemistry
  • Molecular Evolution

Background:

  • The RNA World Hypothesis posits that RNA molecules were central to early life, preceding DNA and proteins.
  • Current models suggest RNA synthesized nonenzymatically from activated ribonucleotides, with some gaining catalytic activity.
  • Prebiotic conditions likely included a variety of noncanonical ribonucleotides alongside standard ones.

Purpose of the Study:

  • To investigate the potential role of noncanonical ribonucleotides in early RNA evolution.
  • To explore how modified bases could enhance RNA catalytic function and folding.
  • To propose a mechanism by which short RNAs could achieve catalytic capabilities necessary for self-replication.

Main Methods:

  • Theoretical modeling of RNA folding with noncanonical bases.
  • Analysis of potential prebiotic synthesis pathways for modified ribonucleotides.
  • Comparative study of catalytic activities of standard versus modified RNA motifs.

Main Results:

  • Noncanonical ribonucleotides can increase the structural diversity of RNA molecules.
  • Shorter RNA sequences incorporating modified bases may exhibit enhanced catalytic potential.
  • Certain modified bases resemble cofactors, potentially aiding early catalytic functions.

Conclusions:

  • Noncanonical ribonucleotides likely played a crucial role in the early evolution of RNA.
  • The incorporation of modified bases could have lowered the threshold for RNA catalytic activity.
  • This provides a plausible pathway for the emergence of self-replicating RNA systems.