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Stabilization of RNA stacking by pseudouridine

D R Davis1

  • 1Department of Medicinal Chemistry, University of Utah, Salt Lake City 84112, USA.

Nucleic Acids Research
|December 25, 1995
PubMed
Summary
This summary is machine-generated.

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Pseudouridine (psi) enhances RNA stability by promoting better base stacking and a more stable helical structure compared to uridine. This conformational stabilization is an intrinsic property of pseudouridine, crucial for RNA structural integrity.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Modified nucleosides play critical roles in RNA structure and function.
  • Pseudouridine (psi) is a common RNA modification, but its precise structural impact is not fully understood.

Purpose of the Study:

  • To compare the effects of pseudouridine (psi) and uridine on RNA structure.
  • To investigate the influence of psi on base stacking and helical conformation in model RNA oligonucleotides.

Main Methods:

  • 1H NMR spectroscopy to determine sugar pucker and NOE experiments.
  • UV and Circular Dichroism (CD) spectroscopy to assess base stacking and helical structure.
  • Temperature-dependent studies to evaluate conformational stability.

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Main Results:

  • Oligoribonucleotides containing psi exhibited enhanced base stacking and a more stable A-form helical conformation compared to uridine-containing counterparts.
  • NMR data indicated a higher percentage of 3'-endo sugar conformation with psi, correlating with increased stacking.
  • Pseudouridine demonstrated a greater degree of UV hypochromicity and slower N1-H imino proton exchange, signifying enhanced structural stability.

Conclusions:

  • Pseudouridine intrinsically stabilizes RNA structure at the nucleotide level by promoting more stable base stacking.
  • The stabilizing effect of psi extends to neighboring nucleotides, contributing to overall helix stability.
  • These findings in model systems are consistent with psi's role in stabilizing intact rRNA structures.