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A third lineage with two-piece tmRNA.

Stephen M Sharkady1, Kelly P Williams

  • 1Department of Biology, Indiana University, Bloomington, IN, USA.

Nucleic Acids Research
|August 25, 2004
PubMed
Summary
This summary is machine-generated.

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Bacteria utilize tmRNA to rescue stalled ribosomes. A rare two-piece tmRNA form, found in a third lineage, opens the mRNA domain loop, enhancing function and revealing convergent evolution in bacterial gene regulation.

Area of Science:

  • Bacteriology
  • Molecular Biology
  • Genetics

Background:

  • Bacterial tmRNA (transfer messenger RNA) possesses both tRNA and mRNA characteristics, crucial for resolving stalled ribosomes.
  • Typically, tmRNA has a one-piece structure where termini pair, forming a looped mRNA domain. Variations exist, including a two-piece form that opens this loop.

Purpose of the Study:

  • To investigate the functional implications of a loop-opened, two-piece tmRNA structure.
  • To identify and characterize a novel instance of this tmRNA variation in betaproteobacteria.

Main Methods:

  • Bioinformatic analysis to identify permuted tmRNA genes in Dechloromonas aromatica and related species.
  • Biochemical assays using purified components to test the in vitro activity of the two-piece tmRNA.

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Main Results:

  • A permuted tmRNA gene was identified in Dechloromonas aromatica, leading to a two-piece tmRNA composed of distinct mRNA and aminoacylatable pieces.
  • These two pieces, when combined, demonstrated activity with purified E. coli translational machinery, though not independently.
  • The secondary structure of this betaproteobacterial two-piece tmRNA differs from previously characterized forms.

Conclusions:

  • The discovery of a third independent lineage with loop-opened, two-piece tmRNA strengthens the hypothesis of convergent evolution driven by functional benefits.
  • This finding highlights the adaptability of tmRNA structure and function across diverse bacterial groups.
  • The complex genetic origin, potentially involving horizontal gene transfer, warrants further investigation.