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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Xylonucleic acid: synthesis, structure, and orthogonal pairing properties.

Mohitosh Maiti1, Munmun Maiti1, Christine Knies2

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Xylonucleic acid (XyloNA), a synthetic nucleic acid with a xylose sugar backbone, was synthesized and characterized. XyloNA forms an orthogonal self-pairing system, offering potential for synthetic biology applications.

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Area of Science:

  • Synthetic biology
  • Origin of life studies
  • Xeno-nucleic acid chemistry

Background:

  • Xeno-nucleic acids (XNAs) are engineered nucleic acid analogues with novel properties.
  • Investigating XNAs is crucial for understanding the origin of life and developing synthetic biological systems.

Purpose of the Study:

  • To synthesize and characterize XyloNA, a xeno-nucleic acid containing a xylose sugar backbone.
  • To evaluate the pairing and structural properties of XyloNA in comparison to DNA and RNA.

Main Methods:

  • Synthesis of four XyloNA nucleotide building blocks.
  • Assembly of XyloNA oligonucleotides with natural nucleobases.
  • Spectroscopic studies including thermal UV-melting, Circular Dichroism (CD), and solution-state Nuclear Magnetic Resonance (NMR).

Main Results:

  • Successful synthesis of XyloNA building blocks and oligonucleotides.
  • XyloNA demonstrated orthogonal self-pairing capabilities.
  • Structural analysis revealed a slightly right-handed extended helical geometry for XyloNA.

Conclusions:

  • DNA and RNA possess superior structure-function properties for selection as prebiotic informational polymers compared to XyloNA.
  • XyloNA presents potential as an orthogonal genetic system for applications in synthetic biology.