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Related Experiment Videos

Correlating structural dynamics and function in single ribozyme molecules.

Xiaowei Zhuang1, Harold Kim, Miguel J B Pereira

  • 1Department of Physics, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|May 25, 2002
PubMed
Summary
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Hairpin ribozyme function depends on its structural dynamics. Molecules rarely switch between active and inactive states, explaining varied reaction rates in catalytic RNAs.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • RNA catalysis

Background:

  • The hairpin ribozyme is a catalytic RNA molecule.
  • Its function involves transitions between active (docked) and inactive (undocked) enzyme-substrate complex conformations.

Purpose of the Study:

  • To investigate the correlation between the structural dynamics and function of the hairpin ribozyme.
  • To understand the molecular mechanisms underlying substrate cleavage kinetics.

Main Methods:

  • Single-molecule fluorescence methods were employed.
  • Analysis of enzyme-substrate complex conformations and transitions.

Main Results:

  • Complex structural dynamics were observed, with four distinct docked states of varying stabilities.

Related Experiment Videos

  • A strong memory effect was identified, indicating infrequent switching between docked states.
  • Substrate cleavage is rate-limited by a combination of conformational transitions and reversible chemical equilibrium.

    • Conclusions:

    • The observed structural dynamics quantitatively explain the heterogeneous cleavage kinetics in catalytic RNAs.
    • A strong coupling between structural dynamics and function is likely a general characteristic of RNA molecules.