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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Isoxazole Nucleosides as Building Blocks for a Plausible Proto-RNA.

Felix Xu1, Antony Crisp1, Thea Schinkel1

  • 1Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, 81377, Munich, Germany.

Angewandte Chemie (International Ed. in English)
|September 5, 2022
PubMed
Summary

Isoxazole nucleosides, formed from simple chemicals, show potential as early RNA precursors. These primitive molecules could rearrange into RNA, aiding the origin of life.

Keywords:
IsoxazolesOrigin of LifePrebiotic ChemistryProto-RNARNA

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Area of Science:

  • Origin of Life Studies
  • Biochemistry
  • Molecular Evolution

Background:

  • Understanding the evolution of RNA is crucial for explaining the origin of life.
  • The complexity of modern RNA suggests a gradual evolutionary process from simpler precursors.
  • Proto-RNAs, ancestral forms of RNA, likely preceded current RNA structures.

Purpose of the Study:

  • To investigate plausible prebiotic precursors for RNA.
  • To explore the potential of isoxazole nucleosides as building blocks for early RNA.
  • To understand the chemical mechanisms that could lead to RNA formation from primitive molecules.

Main Methods:

  • Chemical synthesis of isoxazole nucleosides from hydroxylamine, cyanoacetylene, urea, and ribose.
  • Investigating the rearrangement of isoxazole nucleosides within a strand to form cytidine.
  • Analyzing the stereochemical control exerted by seed-nucleosides during anomeric center formation.

Main Results:

  • Isoxazole nucleosides are readily formed from simple chemical precursors.
  • These nucleosides can rearrange within a strand to yield cytidine, enhancing RNA pairing stability.
  • A defined stereochemistry in a seed-nucleoside can direct the anomeric center configuration during transformation.

Conclusions:

  • Isoxazole ribosides represent a viable evolutionary pathway for primitive RNA precursors.
  • The formation and rearrangement of isoxazole nucleosides provide a plausible mechanism for the emergence of RNA.
  • This study sheds light on the chemical steps involved in the origin of genetic material.