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Metabolic engineering of Escherichia coli for the biosynthesis of 2-pyrrolidone.


ABSTRACT: 2-Pyrrolidone is a valuable bulk chemical with myriad applications as a solvent, polymer precursor and active pharmaceutical intermediate. A novel 2-pyrrolidone synthase, ORF27, from Streptomyces aizunensis was identified to catalyze the ring closing dehydration of ?-aminobutyrate. ORF27's tendency to aggregate was resolved by expression at low temperature and fusion to the maltose binding protein (MBP). Recombinant Escherichia coli was metabolically engineered for the production of 2-pyrrolidone from glutamate by expressing both the genes encoding GadB, a glutamate decarboxylase, and ORF27. Incorporation of a GadB mutant lacking H465 and T466, GadB_?HT, improved the efficiency of one-pot 2-pyrrolidone biosynthesis in vivo. When the recombinant E. coli strain expressing the E. coli GadB_?HT mutant and the ORF27-MBP fusion was cultured in ZYM-5052 medium containing 9 g/L of l-glutamate, 7.7 g/L of l-glutamate was converted to 1.1 g/L of 2-pyrrolidone within 31 h, achieving 25% molar yield from the consumed substrate.

SUBMITTER: Zhang J 

PROVIDER: S-EPMC5779725 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Metabolic engineering of <i>Escherichia coli</i> for the biosynthesis of 2-pyrrolidone.

Zhang Jingwei J   Kao Emily E   Wang George G   Baidoo Edward E K EEK   Chen Matthew M   Keasling Jay D JD  

Metabolic engineering communications 20151110


2-Pyrrolidone is a valuable bulk chemical with myriad applications as a solvent, polymer precursor and active pharmaceutical intermediate. A novel 2-pyrrolidone synthase, ORF27, from <i>Streptomyces aizunensis</i> was identified to catalyze the ring closing dehydration of γ-aminobutyrate. ORF27's tendency to aggregate was resolved by expression at low temperature and fusion to the maltose binding protein (MBP). Recombinant <i>Escherichia coli</i> was metabolically engineered for the production o  ...[more]

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