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Related Experiment Videos

Descent of a split RNA.

Kelly P Williams1

  • 1Department of Biology, Indiana University, 1001 East Third Street, Bloomington, IN 47405, USA. kellwill@indiana.edu

Nucleic Acids Research
|April 25, 2002
PubMed
Summary
This summary is machine-generated.

Most cyanobacteria have one-piece tmRNA, but some have a two-piece form. This study reveals the one-piece tmRNA structure, identifying unique features and proposing evolutionary events for the two-piece tmRNA. Keywords: tmRNA structure, cyanobacteria evolution, RNA processing.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Transfer-messenger RNA (tmRNA) plays a crucial role in bacterial protein synthesis.
  • While typically a single molecule, a subset of cyanobacteria exhibits a two-piece tmRNA structure derived from a processed, circularly permuted precursor.
  • Understanding tmRNA structure and evolution provides insights into bacterial gene expression regulation.

Purpose of the Study:

  • To elucidate the secondary structure of the one-piece tmRNA found in most cyanobacteria.
  • To investigate the evolutionary pathways leading to the emergence of the two-piece tmRNA in a specific cyanobacterial clade.
  • To identify key sequence conservation patterns and structural rearrangements involved in tmRNA evolution.

Main Methods:

Related Experiment Videos

  • Phylogenetic sequence comparison was employed to determine the secondary structure of cyanobacterial one-piece tmRNA.
  • Comparative analysis of sequence conservation patterns between one-piece and two-piece tmRNA forms.
  • Modeling of potential gene rearrangement events, including permutation and duplication.

    • Main Results:

    • The secondary structure of cyanobacterial one-piece tmRNA was established, revealing a novel fifth pseudoknot and a branched structure at the tag reading frame terminus.
    • Sequence conservation analysis suggests complex evolutionary events, challenging simple gene permutation models for the two-piece tmRNA origin.
    • Evidence points towards an additional rearrangement event that regenerated a functional structure at the cost of a neighboring one.

    Conclusions:

    • Cyanobacterial one-piece tmRNA possesses a unique secondary structure distinct from other known tmRNAs.
    • The evolution of the two-piece tmRNA likely involved intricate gene rearrangements beyond simple permutation models.
    • These findings contribute to a deeper understanding of RNA structural diversity and evolutionary mechanisms in prokaryotes.