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Recoding UAG to selenocysteine in Saccharomyces cerevisiae.

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Summary
This summary is machine-generated.

Researchers engineered yeast to produce selenoproteins by creating a new selenocysteine (Sec) biosynthesis pathway. This breakthrough enables site-specific Sec incorporation in Saccharomyces cerevisiae, advancing recombinant protein production.

Keywords:
genetic code expansionselenocysteineselenoproteintRNAtranslationyeast

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • Selenocysteine (Sec) incorporation imparts unique properties to proteins.
  • Eukaryotic selenoprotein production is hindered by the loss of the Sec biosynthesis pathway in fungi.
  • Previous success in bacterial Sec production informed this study.

Purpose of the Study:

  • To establish a functional Sec biosynthesis pathway in Saccharomyces cerevisiae.
  • To enable site-specific genetic encoding of Sec in yeast.
  • To facilitate recombinant production of eukaryotic selenoproteins.

Main Methods:

  • Designed a novel Sec biosynthesis pathway in yeast using bacterial components.
  • Mutated yeast tRNASer to mimic bacterial tRNASec for recognition by specific enzymes.
  • Combined pathway engineering with metabolic engineering for Sec incorporation.

Main Results:

  • Successfully established a novel Sec biosynthesis pathway in Saccharomyces cerevisiae.
  • Demonstrated site-specific incorporation of Sec into a target protein.
  • Produced active methionine sulfate reductase containing genetically encoded Sec.

Conclusions:

  • Yeast can be engineered for selenoprotein production through site-specific Sec incorporation.
  • This work overcomes evolutionary loss of the Sec pathway in fungi.
  • Opens avenues for facile recombinant production of valuable selenoproteins in yeast.