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Related Experiment Videos

Efficient, pH-dependent RNA ligation by the VS ribozyme in trans.

Aileen C McLeod1, David M J Lilley

  • 1Cancer Research UK Nucleic Acid Structure Research Group, Department of Biochemistry, MSI/WTB Complex, The University of Dundee, UK.

Biochemistry
|January 28, 2004
PubMed
Summary

The VS ribozyme efficiently ligates substrates in trans when a helix prevents dissociation. Nucleotide C755 is crucial for ligation, and pH affects reaction rates, suggesting protonation states influence catalysis.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • The VS ribozyme is a catalytic RNA molecule with ligase activity.
  • Ribozyme function is influenced by substrate structure and reaction conditions.

Purpose of the Study:

  • To investigate the mechanism of trans ligation by the VS ribozyme.
  • To identify key nucleotides and reaction parameters affecting ligation efficiency.

Main Methods:

  • Enzymatic assays to measure ligation and cleavage rates.
  • Site-directed mutagenesis to alter ribozyme sequence (e.g., C755A).
  • pH dependence studies to determine reaction kinetics.

Main Results:

  • Extended helix Ia in the substrate (>or=10 bp) enhances trans ligation to ~80%.

Related Experiment Videos

  • Nucleotide C755 is critical for ligation, with C755A variant showing a 70-fold reduced ligation rate.
  • Trans ligation rate is pH-dependent, with a pK(A) of 5.6, suggesting protonation states influence catalysis.
  • A756 is implicated in substrate binding or catalysis.

    • Conclusions:

    • VS ribozyme trans ligation is highly efficient when substrate dissociation is prevented.
    • C755 plays a specific role in organizing ligation substrate termini.
    • The ribozyme likely catalyzes ligation in its deprotonated state and cleavage in its protonated state, with A756 as a potential protonation site.