alexa Genetic system constructed to overproduce and secrete proinsulin in Bacillus subtilis.
Food & Nutrition

Food & Nutrition

Journal of Probiotics & Health

Author(s): OlmosSoto J, ContrerasFlores R

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Abstract The first amino acid residue from a proinsulin gene was fused in frame with the last amino acid residue of the aprE signal peptide sequence from Bacillus subtilis, using an overlapping PCR methodology. For expression of the fused DNA the aprE regulatory region (aprERR) was used. A six-protease-deficient strain of B. subtilis with the hpr2 and degU32 mutations was constructed for overproduction of the recombinant protein. The production of proinsulin was carried out in a mineral medium which facilitated the purification of proinsulin. Samples were taken during growth and analyzed by RIA and Western blot. Proinsulin was overproduced (1 mg ml(-1)) and 90\% was secreted into the culture medium 1 h after stationary phase began. This article was published in Appl Microbiol Biotechnol and referenced in Journal of Probiotics & Health

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