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RNA Structure01:23

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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Structure-function analysis of yeast tRNA ligase.

Li Kai Wang1, Stewart Shuman

  • 1Molecular Biology Program, Sloan-Kettering Institute, New York, NY 10021, USA.

RNA (New York, N.Y.)
|June 1, 2005
PubMed
Summary
This summary is machine-generated.

Trl1 is a crucial enzyme for tRNA splicing. Mutational analysis revealed essential residues and conserved motifs, suggesting tRNA ligase as a drug target for fungal and protozoal infections.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Trl1 is an essential enzyme in Saccharomyces cerevisiae responsible for tRNA splicing.
  • It comprises two catalytic domains: an N-terminal adenylyltransferase/ligase and a C-terminal 5'-kinase/cyclic phosphodiesterase.
  • These domains can function independently in vivo but do not form a stable complex in trans.

Purpose of the Study:

  • To elucidate the structural requirements of the RNA ligase component of Trl1.
  • To identify essential amino acid residues for Trl1 adenylyltransferase activity.
  • To explore the potential of tRNA ligase as a drug target.

Main Methods:

  • Mutational analysis, including alanine scanning and conservative substitutions, was performed on conserved amino acids in Trl1.
  • Enzyme activity assays were conducted in vitro to assess the impact of mutations.
  • Bioinformatic analysis identified homologous tRNA ligases in other organisms.

Main Results:

  • 23 new essential residues for Trl1-(1-388) activity were identified.
  • Specific mutations (Lys114, Glu184, Glu266, Lys284) abolished Trl1 adenylyltransferase activity in vitro.
  • Essential elements include conserved nucleotidyltransferase motifs, a unique N-terminal segment, and fungal-specific residues.

Conclusions:

  • The study clarifies structure-activity relationships within the Trl1 ligase domain.
  • Conserved motifs suggest functional similarities with other ligases and capping enzymes.
  • The identification of yeastlike tRNA ligases in Leishmania and Trypanosoma highlights tRNA ligase as a potential target for antifungal and antiprotozoal drug discovery.