Abstract:
:Bottlenecks in protein expression and secretion often limit the development of industrial processes. By manipulating chaperone and foldase levels, improvements in yeast secretion were found for a number of proteins. Recently, sustained endoplasmic reticulum stress, occurring due to recombinant protein production, was reported to cause oxidative stress in yeast. Saccharomyces cerevisiae cells are able to trigger an adaptive response to oxidative-stress conditions, resulting in the upregulation of both primary and secondary antioxidant defenses. SOD1 encodes for a superoxide dismutase that catalyzes the dismutation of superoxide anions (O(2)(-)) into oxygen and hydrogen peroxide. It is a Cu(2+)/Zn(2+) metalloenzyme and represents an important antioxidant defense in nearly all aerobic and aerotolerant organisms. We found that overexpression of the Kluyveromyces lactis SOD1 (KlSOD1) gene was able to increase the production of two different heterologous proteins, human serum albumin (HSA) and glucoamylase from Arxula adeninivorans. In addition, KlSOD1 overexpression led to a significant decrease in the amount of reactive oxygen species (ROS) that originated during protein production. The yield of HSA also increased when K. lactis cells were grown in the presence of the antioxidant agent ascorbic acid and decreased when cells were challenged with menadione, a ROS generator compound. Moreover, we observed that, in high-osmolarity medium, cells overexpressing KlSOD1 showed higher growth rates than control cells. Our results thus further support the notion that the production of some heterologous proteins may be improved by manipulating genes involved in general stress responses.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Raimondi S,Zanni E,Talora C,Rossi M,Palleschi C,Uccelletti Ddoi
10.1128/AEM.00955-08subject
Has Abstractpub_date
2008-12-01 00:00:00pages
7130-7issue
23eissn
0099-2240issn
1098-5336pii
AEM.00955-08journal_volume
74pub_type
杂志文章abstract::Iron (Fe) is one of the most important micronutrients for most life forms on earth. While abundant in soil, Fe bioavailability in oxic soil is very low. Under environmental conditions, bacteria need to acquire sufficient Fe to sustain growth while limiting the energy cost of siderophore synthesis. Biofilm formation mi...
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journal_title:Applied and environmental microbiology
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pub_type: 杂志文章
doi:10.1128/AEM.50.1.172-173.1985
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journal_title:Applied and environmental microbiology
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.41.2.559-560.1981
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doi:10.1128/AEM.53.9.2193-2205.1987
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
doi:10.1128/AEM.49.3.637-643.1985
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abstract::Industrial production of the edible basidiomycete Pleurotus ostreatus (oyster mushroom) is based on a solid fermentation process in which a limited number of selected strains are used. Optimization of industrial mushroom production depends on improving the culture process and breeding new strains with higher yields an...
journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
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doi:10.1128/AEM.40.2.223-230.1980
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journal_title:Applied and environmental microbiology
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
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