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• W2191824595 abstract "Clostridium pasteurianum is receiving growing attention for its unique metabolic properties, particularly its ability to convert waste glycerol and glycerol-rich byproducts into butanol, a prospective biofuel. Genetic tool development and whole genome sequencing have recently been investigated to advance the genetic tractability of this potential industrial host. Nevertheless, methodologies for tuning gene expression through plasmid-borne expression and chromosomal gene downregulation are still absent. Here we demonstrate plasmid-borne heterologous gene expression and gene knockdown using antisense RNA in C. pasteurianum. We first employed a common thermophilic β-galactosidase (lacZ) gene reporter system from Thermoanaerobacterium thermosulfurogenes to characterize two promoters involved in the central fermentative metabolism of C. pasteurianum. Due to a higher level of constitutive lacZ expression compared to the ferredoxin gene (fdx) promoter, the thiolase (thl) promoter was selected to drive expression of asRNA. Expression of a lacZ asRNA resulted in 52%–58% downregulation of β-galactosidase activity compared to the control strain throughout the duration of culture growth. Subsequent implementation of our asRNA approach for downregulation of the native hydrogenase I gene (hydA) in C. pasteurianum resulted in altered end product distribution, characterized by an increase in production of reduced metabolites, particularly butyrate (40% increase) and ethanol (25% increase). Knockdown of hydA was also accompanied by increased acetate formation and lower levels of 1,3-propanediol, signifying a dramatic shift in cellular metabolism in response to inhibition of the hydrogenase enzyme. The methodologies described herein for plasmid-based heterologous gene expression and antisense-RNA-mediated gene knockdown should promote rational metabolic engineering of C. pasteurianum for enhanced production of butanol as a prospective biofuel." @default.
• W2191824595 created "2016-06-24" @default.
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• W2191824595 creator A5057938283 @default.
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• W2191824595 date "2015-12-09" @default.
• W2191824595 modified "2023-10-15" @default.
• W2191824595 title "Antisense-RNA-Mediated Gene Downregulation in Clostridium pasteurianum" @default.
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• W2191824595 doi "https://doi.org/10.3390/fermentation1010113" @default.
• W2191824595 hasPublicationYear "2015" @default.
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