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Probing the hammerhead ribozyme structure with ribonucleases

R A Hodgson1, N J Shirley, R H Symons

  • 1Department of Plant Science, Waite Institute, University of Adelaide, Australia.

Nucleic Acids Research
|May 11, 1994
PubMed
Summary
This summary is machine-generated.

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RNase digestion confirmed the hammerhead ribozyme

Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Structure

Background:

  • Hammerhead ribozymes are crucial RNA enzymes.
  • Understanding their structure is key to their catalytic function.
  • RNase digestion is a tool to probe RNA conformation.

Purpose of the Study:

  • To investigate the secondary structure of hammerhead ribozymes using RNase digestion.
  • To compare the structures of cis and trans hammerhead ribozymes.
  • To determine the role of Mg2+ in hammerhead ribozyme structure and self-cleavage.

Main Methods:

  • Chemical synthesis of hammerhead ribozymes.
  • Limited RNase A digestion to identify accessible sites.
  • Analysis of digestion profiles to infer secondary structure.

Related Experiment Videos

Main Results:

  • Digestion profiles confirmed the predicted base-paired secondary structure.
  • Cis and trans hammerhead structures showed similar RNase susceptibility.
  • Mg2+ presence did not alter RNase digestion patterns, suggesting a catalytic role.
  • Stem I and II were stable, while stem III was susceptible to digestion.
  • Specific guanosine residues (GL2.1 and G12) showed resistance to digestion.
  • G12's susceptibility increased when the ribozyme was not complexed with its substrate.

Conclusions:

  • RNase digestion is effective for validating hammerhead ribozyme secondary structure.
  • Hammerhead ribozyme structure is conserved between cis and trans forms.
  • Mg2+ likely plays a catalytic rather than structural role in self-cleavage.