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Nucleic Acids and Nucleotides01:20

Nucleic Acids and Nucleotides

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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. 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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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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Nucleobase Protection of Deoxyribo- and Ribonucleosides.

Geeta Meher1, Nabin K Meher2, Radhakrishnan P Iyer1

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Current Protocols in Nucleic Acid Chemistry
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PubMed
Summary

Protecting groups are crucial for synthesizing modified oligonucleotides used in therapeutics and research. This review details recent advancements in protecting group strategies for reliable oligonucleotide synthesis and preventing nucleobase damage.

Keywords:
N-acylationcarbamatescyanoethylationdepurinationnucleobasesphotolytic cleavagesilyl protection

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Area of Science:

  • Chemical Biology
  • Molecular Biology
  • Organic Chemistry

Background:

  • Oligonucleotides with chemical modifications are vital for therapeutics, diagnostics, and research.
  • Reliable synthesis of oligonucleotides depends on protected nucleoside building blocks.

Purpose of the Study:

  • To provide a revised overview of protecting groups for oligonucleotide synthesis.
  • To highlight recent developments in protecting group strategies.
  • To address protecting groups for nucleobases to prevent unwanted modifications.

Main Methods:

  • Review of literature on protecting group chemistry for nucleosides and oligonucleotides.
  • Discussion of protecting groups for exocyclic amino groups, hydroxyl groups, and phosphodiester linkages.
  • Examination of protecting groups for thymine/uracil and guanine imide/lactam functions.

Main Results:

  • Recent advancements in protecting groups facilitate more reliable oligonucleotide synthesis.
  • Specific protecting groups are essential for the hydroxyl groups (2', 3', 5') and internucleotide phospho-linkage.
  • Protecting groups for thymine/uracil and guanine prevent irreversible nucleobase modifications during synthesis.

Conclusions:

  • Effective protecting group strategies are fundamental for the successful synthesis of modified oligonucleotides.
  • Continued development of protecting groups enhances the utility of oligonucleotides in various applications.
  • Preventing nucleobase modification is critical for maintaining oligonucleotide integrity and function.