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Related Experiment Videos

Nuclear pre-tRNA terminal structure and RNase P recognition

Y Lee1, D W Kindelberger, J Y Lee

  • 1Department of Biological Chemistry, The University of Michigan, Ann Arbor 48109-0606, USA.

RNA (New York, N.Y.)
|February 1, 1997
PubMed
Summary

The -1 mismatch in nuclear pre-tRNA is crucial for efficient RNase P enzyme activity and substrate binding. Removing this mismatch impairs pre-tRNA processing and causes precursor accumulation.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Processing

Background:

  • Nuclear pre-tRNA transcripts feature an aminoacyl stem extension via 5'-leader and 3'-trailing sequences.
  • A mismatch at the -1 position, preceding the mature 5' end, is typically observed in these transcripts.
  • Tertiary structural models of RNase P RNAs suggest this mismatch prevents steric hindrance in the active site.

Purpose of the Study:

  • To investigate the role of the -1 mismatch in nuclear pre-tRNA structure and RNase P-mediated cleavage.
  • To test the hypothesis that the -1 mismatch is essential for substrate positioning and catalysis by RNase P.

Main Methods:

  • Engineering uninterrupted aminoacyl stem extensions in four nuclear tRNA precursors lacking the -1 mismatch.
  • Comparing cleavage rates of normal and altered pre-tRNA precursors using kinetic analyses (Km and kcat).

Related Experiment Videos

  • Assessing pre-tRNA processing in vivo for a mutant precursor lacking the -1 mismatch.

    • Main Results:

    • Kinetic determinations for pre-tRNA(SUP53) revealed that the -1 mismatch is vital for both substrate affinity (Km) and catalytic efficiency (kcat) of nuclear RNase P.
    • Altering the -1 position significantly impacted the cleavage rates.
    • In vivo studies showed accumulation of the pre-tRNA(SUP53) mutant lacking the -1 mismatch, indicating impaired processing.

    Conclusions:

    • The -1 mismatch in nuclear pre-tRNA is a critical structural element for efficient RNase P function.
    • This mismatch is essential for optimal substrate binding and catalysis, as well as product release.
    • Disruption of the -1 mismatch leads to compromised pre-tRNA maturation in vivo.