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Related Experiment Videos

Functional SmpB-ribosome interactions require tmRNA.

Thomas R Sundermeier1, A Wali Karzai

  • 1Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, New York 11794, USA.

The Journal of Biological Chemistry
|October 4, 2007
PubMed
Summary
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Small protein B (SmpB) does not pre-bind bacterial stalled ribosomes. Functional interactions require transfer messenger RNA (tmRNA), with SmpB and tmRNA forming a complex to initiate trans-translation.

Area of Science:

  • Molecular Biology
  • Bacterial Genetics
  • Protein-RNA Interactions

Background:

  • Small protein B (SmpB) is essential for the bacterial trans-translation system.
  • Trans-translation, mediated by transfer messenger RNA (tmRNA), is a crucial quality control mechanism for bacterial protein synthesis.
  • The precise role of SmpB in initiating ribosome binding and tmRNA recruitment remained unclear.

Purpose of the Study:

  • To investigate the interaction of SmpB with stalled ribosomes.
  • To determine if SmpB pre-binds ribosomes to facilitate tmRNA recruitment.
  • To elucidate the mechanism of SmpB in the initiation of trans-translation.

Main Methods:

  • In vivo and in vitro biochemical assays were used to assess SmpB-ribosome interactions.

Related Experiment Videos

  • Salt sensitivity assays were performed to evaluate the stability of SmpB-ribosome complexes.
  • Analysis of SmpB and tmRNA levels in stalled ribosome fractions under non-stop mRNA conditions.

    • Main Results:

    • Free SmpB interaction with ribosomes is salt-sensitive and labile compared to the SmpB.tmRNA complex.
    • Upon ribosome dissociation, SmpB preferentially binds tmRNA, indicating tmRNA as the high-affinity partner.
    • SmpB enrichment in stalled ribosome fractions occurs only in the presence of tmRNA upon non-stop mRNA induction.

    Conclusions:

    • SmpB does not pre-bind stalled ribosomes; its interaction requires tmRNA.
    • Functional SmpB-stalled ribosome interaction is dependent on the presence of tmRNA.
    • A 1:1:1 complex of SmpB, tmRNA, and EF-Tu(GTP) is proposed to initiate trans-translation by binding stalled ribosomes.