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Related Experiment Videos

The tmRNA Website

K P Williams1, D P Bartel

  • 1Whitehead Institute for Biomedical Research and Department of Biology, Massachusetts Institute of Technology, 9 Cambridge Center, Cambridge, MA 02142, USA. kelly@wi.mit.edu

Nucleic Acids Research
|February 21, 1998
PubMed
Summary
This summary is machine-generated.

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Transfer messenger RNA (tmRNA) facilitates protein quality control by tagging incomplete proteins for degradation. This essential bacterial and plastid RNA plays a crucial role in cellular proteostasis.

Area of Science:

  • Molecular Biology
  • Bacteriology
  • Genomics

Background:

  • Transfer messenger RNA (tmRNA), also known as 10Sa RNA, possesses both tRNA-like and mRNA-like characteristics.
  • tmRNA is integral to the trans-translation process, a unique mechanism for handling aberrant protein synthesis.
  • This process involves tagging incomplete proteins with a C-terminal peptide for subsequent proteolysis.

Purpose of the Study:

  • To document and analyze the distribution of tmRNA sequences across diverse bacterial phyla.
  • To investigate the presence of tmRNA in non-bacterial systems, specifically plastids of the 'red' lineage.
  • To provide a centralized resource for tmRNA sequence data and related literature.

Main Methods:

  • Bioinformatic analysis of genomic sequences to identify tmRNA homologs.

Related Experiment Videos

  • Database compilation of identified tmRNA sequences from various species.
  • Comparative analysis of sequences to predict proteolysis tag regions.

    • Main Results:

    • tmRNA sequences were identified in a wide range of bacterial phyla, including evolutionarily ancient lineages.
    • tmRNA homologs were also found in plastids derived from the 'red' algal lineage.
    • A comprehensive database, the tmRNA Website, was established, containing sequences from 37 species with preliminary alignments and predicted tag sequences.

    Conclusions:

    • tmRNA is a conserved molecular machine with a fundamental role in bacterial protein quality control.
    • Its presence in plastids suggests potential horizontal gene transfer or a shared ancient origin.
    • The tmRNA Website serves as a valuable resource for researchers studying tmRNA function and evolution.