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

Journal:
Metabolic engineering communications


Issue Date:
2016


Abstract(summary):

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 gamma-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_DeltaHT, improved the efficiency of one-pot 2-pyrrolidone biosynthesis in vivo. When the recombinant E. coli strain expressing the E. coli GadB_DeltaHT mutant and the ORF27-MBP fusion was cultured in ZYM-5052 medium containing 9g/L of l-glutamate, 7.7g/L of l-glutamate was converted to 1.1g/L of 2-pyrrolidone within 31h, achieving 25% molar yield from the consumed substrate.=20


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