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Related Experiment Videos

Domain structure in yeast tRNA ligase.

Q Xu1, D Teplow, T D Lee

  • 1Division of Biology, California Institute of Technology, Pasadena 91125.

Biochemistry
|July 3, 1990
PubMed
Summary

Yeast tRNA ligase, essential for precursor tRNA splicing, was purified and studied. Researchers found its three enzymatic activities reside in distinct domains, with lysine-114 identified as the active site.

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Area of Science:

  • Molecular Biology
  • Enzymology
  • Protein Biochemistry

Background:

  • Transfer RNA (tRNA) splicing is a critical post-transcriptional modification.
  • Yeast tRNA ligase is a key enzyme involved in the tRNA splicing pathway.
  • Understanding tRNA ligase structure and function is vital for comprehending gene expression regulation.

Purpose of the Study:

  • To purify and characterize yeast tRNA ligase.
  • To investigate the domain structure and enzymatic activities of tRNA ligase.
  • To identify the active site of the tRNA ligase enzyme.

Main Methods:

  • Purification of yeast tRNA ligase from overexpressing Escherichia coli.
  • Partial proteolytic digestion to generate enzyme fragments.
  • Enzymatic activity assays to map functional domains.
  • Identification of the adenylylated active site residue.

Main Results:

  • Yeast tRNA ligase (95-kDa) was purified to homogeneity.
  • The enzyme possesses phosphodiesterase, polynucleotide kinase, and ligase activities.
  • Proteolytic digestion revealed three distinct domains, each containing a specific enzymatic activity.
  • Lysine-114 was identified as the adenylylated active site, showing limited homology to T4 RNA ligase.

Conclusions:

  • Yeast tRNA ligase functions as a multi-domain enzyme.
  • Enzymatic activities are localized to separate domains connected by protease-sensitive regions.
  • The active site is located within a specific domain, providing insights into tRNA ligase mechanism.

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