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Related Experiment Videos

A recoding element that stimulates decoding of UGA codons by Sec tRNA[Ser]Sec.

Michael T Howard1, Mark W Moyle, Gaurav Aggarwal

  • 1Department of Human Genetics, University of Utah, Salt Lake City, Utah 84112, USA. mhoward@genetics.utah.edu

RNA (New York, N.Y.)
|April 26, 2007
PubMed
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This study shows that a selenocysteine insertion element (SRE) enhances the decoding of UGA codons for selenocysteine incorporation. Efficient selenocysteine insertion still requires the selenocysteine insertion sequence (SECIS) element.

Area of Science:

  • Molecular Biology
  • Gene Expression
  • Protein Synthesis

Background:

  • Selenocysteine insertion into eukaryotic selenoprotein mRNA relies on trans-acting factors and cis-acting elements like the selenocysteine insertion sequence (SECIS).
  • A novel cis-acting element, the selenocysteine codon redefinition element (SRE), has been identified near the UGA-Sec codon in selenoprotein N (SEPN1) mRNA.
  • Phylogenetically conserved SREs are predicted in other eukaryotic selenoprotein mRNAs, suggesting a broader role in selenoprotein synthesis.

Purpose of the Study:

  • To investigate the mechanism by which the SEPN1 SRE influences the decoding of the UGA-Sec codon.
  • To determine the interaction of the SRE with different isoforms of Sec tRNA([Ser]Sec) and its dependence on the SECIS element.

Main Methods:

  • Development of an in vitro translation system optimized for efficient selenocysteine insertion.

Related Experiment Videos

  • Experimental analysis of the SEPN1 SRE's effect on UGA codon readthrough using both methylated and unmethylated Sec tRNA([Ser]Sec) isoforms.
  • Assessment of the SRE's impact in the presence and absence of a 3'-UTR SECIS element.

    • Main Results:

    • The SRE significantly stimulates the decoding of the UGA-Sec codon by both Sec tRNA([Ser]Sec) isoforms.
    • The stimulatory effect of the SRE on UGA codon readthrough is independent of the SECIS element's presence.
    • However, highly efficient selenocysteine insertion remains dependent on the 3'-UTR SECIS element.

    Conclusions:

    • The SRE acts as a controller of UGA codon decoding efficiency, influencing the amount of selenoprotein produced.
    • Variations in recoding elements near UGA-Sec codons suggest differential roles in regulating selenoprotein biosynthesis.
    • These findings enhance our understanding of the complex mechanisms governing selenocysteine incorporation in eukaryotes.