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Templated RNA ligation using 2

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Area of Science:

  • * Origin of life studies
  • * Prebiotic chemistry
  • * RNA biochemistry

Background:

  • * RNA replication is crucial for the origin of life.
  • * Prebiotically relevant activators are needed for RNA ligation.
  • * 2',3'-cyclic phosphate (>P) is a naturally occurring RNA hydrolysis product.

Purpose of the Study:

  • * To investigate the templated ligation of RNA using 2',3'-cyclic phosphate (>P).
  • * To determine the optimal conditions for this reaction.
  • * To assess the fidelity and efficiency of the ligation process.

Main Methods:

  • * Gel electrophoresis and high-performance liquid chromatography (HPLC).
  • * RNA ligation experiments under varying pH, temperature, and salt concentrations.
  • * Analysis of ligation products for canonical linkages and fidelity.

Main Results:

  • * Templated RNA ligation occurs efficiently in low-salt aqueous solutions (1 mM MgCl2) at alkaline pH (9–11) and temperatures from -20 to 25 °C.
  • * Canonical linkages increased to 50%, with ligation fidelity of 82% (3' end) and 91% (5' end).
  • * A 96-mer strand was synthesized, demonstrating a pathway for ribozyme assembly compatible with strand separation.

Conclusions:

  • * 2',3'-cyclic phosphate-mediated templated ligation is a performant reaction for RNA replication and elongation under prebiotic conditions.
  • * The reaction proceeds efficiently in simple, low-salt alkaline solutions, mimicking early Earth environments.
  • * This pathway provides a viable mechanism for the assembly of long RNA strands, crucial for abiogenesis.