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Enriching adenosine by thymine-rich DNA oligomers.

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Thymine-rich DNA oligomers effectively enrich adenosine, a molecule crucial in physiology and pathology. A clamped DNA hairpin structure demonstrated the highest binding affinity and minimized conformational changes, aiding adenosine separation.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Adenosine plays vital roles in physiological and pathological processes.
  • Accurate detection of adenosine is challenging due to complex biological matrices.
  • Existing methods for adenosine detection and separation face limitations.

Purpose of the Study:

  • To develop a novel method for enriching adenosine using DNA oligomers.
  • To investigate the influence of DNA secondary structures on adenosine binding affinity.
  • To assess the potential of thymine-rich DNA for adenosine separation and purification.

Main Methods:

  • Design and synthesis of thymine-rich DNA oligomers with varying secondary structures.
  • Characterization of adenosine binding affinity (Kd) using techniques like surface plasmon resonance.
  • Evaluation of DNA conformational changes upon adenosine binding.
  • Assessment of DNA's ability to suppress adenine precipitation.

Main Results:

  • Thymine-rich DNA oligomers showed varying binding affinities to adenosine (Kd range: 1.25–5.0 mM).
  • A clamped DNA hairpin structure exhibited the highest binding affinity for adenosine.
  • The clamped DNA hairpin structure displayed minimal conformational changes during adenosine binding.
  • These DNA oligomers effectively suppressed the precipitation of supersaturated adenine.

Conclusions:

  • Thymine-rich DNA oligomers represent a promising tool for adenosine enrichment and separation.
  • DNA secondary structure significantly impacts binding affinity and selectivity for adenosine.
  • The clamped DNA hairpin design offers a stable and effective platform for adenosine capture.