Expression and function of an Hac1-regulated multi-copy xylanase gene in Saccharomyces cerevisiae.

Scientific Reports
Changjie BaoSitong Zhang

Abstract

Saccharomyces cerevisiae-based expression systems, which rely on safe, food-grade strains, are low cost, simple to operate, and can be used for large-scale fermentation. However, low levels of foreign protein expression by S. cerevisiae have limited their widespread application. The ability of the endoplasmic reticulum (ER) to fold and process foreign proteins is an important factor restricting the expression of foreign proteins. In the current study, the effects of transcription factor Hac1p, which is involved in the unfolded protein response pathway, on S. cerevisiae-based expression of xylanase gene xynB from Aspergillus niger were examined. Overlap extension polymerase chain reaction (PCR), rDNA integration and droplet digital PCR technology were used to generate a S. cerevisiae strain (S8) containing eight copies of xynB, allowing high-yield secretory expression of xylanase. The effects of subsequent overexpression of HAC1 in strain S8 on the expression of genes associated with protein folding in the ER were then examined using the GeXP system. Results confirmed the constitutive secretory expression of the multiple copies of xynB following rDNA-based integration of the expression cassette, with a maximum xylanase yield of ...Continue Reading

References

Nov 19, 2011·FEMS Microbiology Letters·Ruchika SharmaGhulam Nabi Qazi
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Datasets Mentioned

BETA
AH001380
BK006945.2
FJ986225.1
KM032189
AF298780.1

Methods Mentioned

BETA
protein folding
protein
glycosylation
PCR
electrophoresis

Software Mentioned

QuantaSoft
Primer
GeXP
BLAST

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