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Structural composition of hammerhead ribozymes

A Takenaka1, O Matsumoto, Y Chen

  • 1Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama.

Journal of Biochemistry
|April 1, 1995
PubMed
Summary

Researchers designed hammerhead ribozymes to study complex structures and crystallization. Modified substrates prevented hydrolysis, enabling the formation and crystallization of binary and ternary complexes for structural analysis.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Hammerhead ribozymes are catalytic RNA molecules with essential roles in gene regulation.
  • Understanding their structure is crucial for elucidating their catalytic mechanisms.

Purpose of the Study:

  • To investigate the structural composition of hammerhead ribozyme complexes.
  • To identify suitable crystallization conditions for these complexes.
  • To explore the structural basis of hammerhead ribozyme catalysis.

Main Methods:

  • Design and synthesis of eleven hammerhead ribozyme variants.
  • Modification of substrate chains to prevent hydrolysis.
  • Electrophoresis to analyze complex formation (binary and ternary).

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  • Crystallization of binary and ternary complexes.
  • X-ray crystallography for structural determination of the binary complex.

    • Main Results:

    • Electrophoresis confirmed the formation of binary (two strands excluding substrate) and ternary (including substrate) complexes.
    • Both binary and ternary complexes were successfully crystallized.
    • The binary complex crystal exhibited Laue symmetry 32 (space groups P321, P3(1)21, or P3(2)21) with specific cell dimensions.
    • The asymmetric unit contains one binary complex, indicating a defined structural organization.

    Conclusions:

    • The catalytic domain of hammerhead ribozymes forms a rigid structure.
    • This rigid structure facilitates the scissile reaction upon substrate binding.
    • The catalytic mechanism resembles that of protein enzymes, highlighting RNA's enzymatic capabilities.