alexa Display of recombinant proteins on Bacillus subtilis spores, using a coat-associated enzyme as the carrier.
Food & Nutrition

Food & Nutrition

Journal of Probiotics & Health

Author(s): Potot S, Serra CR, Henriques AO, Schyns G

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Abstract The display of proteins such as feed enzymes at the surface of bacterial spore systems has a great potential use for animal feed. Feed enzymes increase the digestibility of nutrients, leading to greater efficiency in the manufacturing of animal products and minimizing the environmental impact of increased animal production. To deliver their full potential in the gut, feed enzymes must survive the harsh conditions of the feed preparation and the gastrointestinal tract. The well-documented resistance of spores to harsh environments, together with the ability to use proteins that compose the spore as carriers for the display of passenger proteins, suggests that spores could be used as innovative tools to improve the formulation of bioactive molecules. Although some successful examples have been reported, in which abundant structural proteins of the Bacillus subtilis spore outer-coat layer were used as carriers for the display of recombinant proteins, only one convincing example resulted in the display of functional enzymes. In addition, no examples are available about the use of an inner-coat protein for the display of an active passenger enzyme. In our study, we show that the inner-coat oxalate decarboxylase (OxdD) can expose an endogenous phytase, a commonly used feed enzyme for monogastric animals, in an active form at the spore surface. Importantly, despite the higher abundance of CotG outer-coat protein, an OxdD-Phy fusion was more represented at the spore surface. The potential of OxdD as a carrier protein is further documented through the spore display of a bioactive heterologous passenger, the tetrameric beta-glucuronidase enzyme from Escherichia coli.
This article was published in Appl Environ Microbiol and referenced in Journal of Probiotics & Health

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