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Related Experiment Videos

The hairpin ribozyme substrate binding-domain: a highly constrained D-shaped conformation.

R Pinard1, D Lambert, J E Heckman

  • 1Markey Center for Molecular Genetics, Department of Microbiology and Molecular Genetics, The University of Vermont, Burlington, VT 05405, USA.

Journal of Molecular Biology
|March 13, 2001
PubMed
Summary

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The hairpin ribozyme

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The hairpin ribozyme is a catalytic RNA molecule crucial for various biological processes.
  • The active conformation of the hairpin ribozyme-substrate complex requires domain interaction, but its internal geometry remains poorly understood.
  • Understanding the precise structural organization is key to elucidating the catalytic mechanism.

Purpose of the Study:

  • To investigate the internal geometry of the substrate-binding domain within an active hairpin ribozyme-substrate complex.
  • To determine the conformational changes of the substrate-binding domain upon docking.
  • To provide insights into the structural basis of hairpin ribozyme catalysis.

Main Methods:

  • Utilized crosslinking and structural approaches.

Related Experiment Videos

  • Employed molecular modeling with the constraint-satisfaction program MC-SYM.
  • Analyzed the conformation of the substrate-binding domain in the context of the docked complex.

    • Main Results:

    • The substrate-binding domain adopts a bent, D-shaped conformation in the docked state, deviating from a previously assumed straight structure.
    • The helices bounding the internal loop are found to be closer than anticipated.
    • This bent conformation explains the catalytic activity with circularized substrates and positions G8 near the cleavage site.

    Conclusions:

    • The hairpin ribozyme-substrate complex exhibits a non-linear internal geometry, specifically a bent substrate-binding domain.
    • This D-shaped conformation is essential for substrate organization and catalytic activity.
    • The proximity of G8 to the cleavage site, dictated by this geometry, suggests its critical role in the reaction mechanism.