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Enhanced expression of heterologous proteins by the use of a superinducible vector in budding yeast

✍ Scribed by Danilo Porro; Marina Lotti; Enzo Martegani; Bianca Maria Ranzi; Lilia Alberghina

Publisher
Springer
Year
1992
Tongue
English
Weight
753 KB
Volume
36
Category
Article
ISSN
1432-0614

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✦ Synopsis

We report the effects of a strong overexpression of the GAL4 activator protein on the expression of UASGAL regulated genes, obtained by cloning the GAL4 gene and the GALl-10 upstream activating sequence (UAS~AL)-lacZ fusion in the same high copy number plasmid. Comparable amounts of active enzyme were obtained by host strains usually producing different levels of cloned proteins due to their different genetic background. The transformed cells constitutively produced low levels of fl-galactosidase (1-2% of total proteins) both in glucose and in raffinose minimal media. Nevertheless, expression was still inducible and a tenfold induction could be rapidly obtained by the addition of 0.5% (w/v) galactose to the culture, even when glucose was still present in the medium.

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