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Related Experiment Videos

RNA quadruplex containing G and A

M Katahira1, K Moriyama, M Kanagawa

  • 1Department of Bioengineering, Faculty of Engineering, Yokohama National University, Japan.

Nucleic Acids Symposium Series
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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The RNA sequence r(GGAGGAA) forms unique higher-order structures, including a novel RNA quadruplex with an A-quartet core, influenced by potassium ions and strand concentration.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • RNA molecules can fold into complex higher-order structures.
  • The formation of these structures is often influenced by ion concentration and sequence composition.

Purpose of the Study:

  • To investigate the higher-order structure formation of the RNA sequence r(GGAGGAA).
  • To elucidate the role of potassium ions (K+) in stabilizing these RNA structures.

Main Methods:

  • Circular Dichroism (CD) spectroscopy to study structural changes.
  • Gel electrophoresis to assess molecular weight and complex formation.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine structural details and equilibria.

Main Results:

Related Experiment Videos

  • r(GGAGGAA) forms higher-order structures upon increased strand concentration or addition of K+.
  • Gel electrophoresis confirmed the formation of a high molecular weight species in the presence of K+.
  • NMR studies revealed a shift in structural equilibrium upon K+ addition, favoring a single structure.

Conclusions:

  • A novel RNA quadruplex structure is formed by r(GGAGGAA) in the presence of K+.
  • This structure features an A-quartet core, stabilized by adenine hydrogen bonds, sandwiched between G-quartets.