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Related Experiment Videos

Yeast RNase P: catalytic activity and substrate binding are separate functions.

M Nichols1, D Söll, I Willis

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511.

Proceedings of the National Academy of Sciences of the United States of America
|March 1, 1988
PubMed
Summary

RNase P enzyme activity in tRNA biosynthesis is crucial. Mutations affecting tRNA structure impact catalysis, not binding, suggesting the protein component aids substrate interaction.

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Area of Science:

  • Molecular Biology
  • Enzymology
  • RNA Processing

Background:

  • Ribonucleoprotein RNase P is essential for tRNA biosynthesis, removing 5'-leader sequences from precursor tRNAs.
  • The RNA moiety of RNase P is critical for its enzymatic activity.

Purpose of the Study:

  • To investigate the mechanism of RNase P by examining substrate binding and product formation using mutant precursor tRNAs.
  • To elucidate the roles of specific nucleotides and base pairing in the acceptor stem of tRNA for RNase P function.

Main Methods:

  • Utilized mutant precursor tRNAs derived from Schizosaccharomyces pombe sup3-e tRNASer with specific nucleotide substitutions (G-1 to A, U-2 to C).
  • Employed equilibrium binding studies with gel retardation assays to analyze RNase P-precursor tRNA complexes.

Related Experiment Videos

  • Assessed the catalytic activity of micrococcal nuclease-inactivated RNase P to differentiate roles of RNA and protein components.

    • Main Results:

    • Mutations causing mispairing at the top of the acceptor stem prevented 5'-leader removal by Saccharomyces cerevisiae RNase P.
    • Dissociation constants for wild-type and mutant precursor tRNAs were similar, indicating 5'-terminal nucleotides affect catalysis, not binding.
    • Catalytic inactivation of the RNase P RNA component did not prevent tRNA precursor binding, suggesting a role for the protein component in substrate recognition.
    • Restoration of base pairing and conservation of wild-type first and second nucleotides were necessary for maximal RNase P cleavage.

    Conclusions:

    • The 5'-terminal nucleotides of tRNA precursors influence RNase P's catalytic efficiency rather than its substrate binding affinity.
    • The protein component of RNase P may play a significant role in substrate binding.
    • RNase P exhibits sequence specificity, requiring specific nucleotides and base pairing at the tRNA acceptor stem for optimal cleavage.