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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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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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Stable Hairpin Structures Formed by Xylose-Based Nucleic Acids.

Charles-Alexandre Mattelaer1, Mohitosh Maiti1, Laurent Smets2

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Chembiochem : a European Journal of Chemical Biology
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PubMed
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Synthetic nucleic acids like xylo- and deoxyxylo-nucleic acids (XyNA and dXyNA) form stable hairpins. The dXyNA hairpin structure reveals a flexible loop and a stable ladder-like duplex, indicating enhanced structural stability.

Keywords:
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Area of Science:

  • Synthetic biology
  • Xenobiology
  • Biochemistry

Background:

  • The central dogma of molecular biology limits genetic information carriers to DNA and RNA.
  • Xenobiology investigates alternative nucleic acid polymers to expand genetic information systems.
  • Xylo- and deoxyxylo-nucleic acids (XyNA and dXyNA) are synthetic candidates for orthogonal genetic systems.

Purpose of the Study:

  • To investigate the structural properties of XyNA and dXyNA.
  • To determine if XyNA and dXyNA can form stable secondary structures.
  • To characterize the folding and stability of these synthetic nucleic acids.

Main Methods:

  • Thermal analysis (melting temperature studies)
  • Spectroscopic analysis (UV-Vis, CD spectroscopy)
  • Nuclear Magnetic Resonance (NMR) spectroscopy for structural determination

Main Results:

  • Both XyNA and dXyNA were shown to form stable hairpin structures.
  • NMR analysis revealed the dXyNA hairpin has a flexible loop and a ladder-like duplex stem.
  • The dXyNA duplex exhibits reduced flexibility, suggesting enhanced structural stability compared to natural nucleic acids.

Conclusions:

  • XyNA and dXyNA are capable of forming stable secondary structures, supporting their potential as orthogonal genetic systems.
  • The structural characteristics of dXyNA indicate a higher degree of stability in folded states.
  • These findings contribute to the field of xenobiology by demonstrating viable synthetic alternatives for genetic information storage.