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GCN4-based expression system (pGES): translationally regulated yeast expression vectors.

A Mimran1, I Marbach, D Engelberg

  • 1Hebrew University of Jerusalem, Israel.

Biotechniques
|March 21, 2000
PubMed
Summary

A novel yeast expression system, pGES, utilizes translational control elements from the GCN4 gene to achieve high-level foreign protein production. This system offers inducible expression under amino acid starvation, enhancing biotechnological applications.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Yeast Genetics

Background:

  • Saccharomyces cerevisiae is a key host for foreign protein expression, but limited effective expression vectors exist.
  • Current vectors often rely on increased transcription and gene dosage, requiring selective media and limiting applications.

Purpose of the Study:

  • To develop a novel yeast expression vector system for enhanced foreign protein production.
  • To leverage translational control mechanisms for inducible gene expression.

Main Methods:

  • Cloned GCN4 regulatory elements (including 5' UTR) and ligated them to the human serum albumin (HSA) gene.
  • Constructed GCN4/HSA expression cassettes on multicopy and integrative plasmids.
  • Evaluated HSA expression under various growth conditions, including amino acid starvation.

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Main Results:

  • GCN4 regulatory elements enabled efficient, translationally controlled HSA expression under amino acid starvation.
  • The GCN4-based expression system (pGES) demonstrated efficient and inducible expression on both plasmid types.
  • Integrated cassettes yielded high HSA levels in dense cultures on rich media.

Conclusions:

  • The pGES system provides a powerful tool for high-yield, inducible foreign protein production in yeast.
  • This represents the first yeast expression vector induced at the translational level.
  • pGES expands options for biotechnological applications requiring controlled protein synthesis.