Journal
AMINO ACIDS
Volume 48, Issue 11, Pages 2519-2531Publisher
SPRINGER WIEN
DOI: 10.1007/s00726-016-2272-6
Keywords
Gamma-aminobutyric acid; Putrescine; Corynebacterium glutamicum; Putrescine transaminase; Gamma-aminobutyraldehyde dehydrogenase; Gamma-aminobutyrate aminotransferase; GABA
Categories
Funding
- evocatal GmbH
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Gamma-aminobutyric acid (GABA), a non-protein amino acid widespread in nature, is a component of pharmaceuticals, foods, and the biodegradable plastic polyamide 4. Corynebacterium glutamicum shows great potential for the production of GABA from glucose. GABA added to the growth medium hardly affected growth of C. glutamicum, since a half-inhibitory concentration of 1.1 M GABA was determined. As alternative to GABA production by glutamate decarboxylation, a new route for the production of GABA via putrescine was established in C. glutamicum. A putrescine-producing recombinant C. glutamicum strain was converted into a GABA producing strain by heterologous expression of putrescine transaminase (PatA) and gamma-aminobutyraldehyde dehydrogenase (PatD) genes from Escherichia coli. The resultant strain produced 5.3 +/- 0.1 g L-1 of GABA. GABA production was improved further by adjusting the concentration of nitrogen in the culture medium, by avoiding the formation of the by-product N-acetylputrescine and by deletion of the genes for GABA catabolism and GABA re-uptake. GABA accumulation by this strain was increased by 51 % to 8.0 +/- 0.3 g L-1, and the volumetric productivity was increased to 0.31 g L-1 h(-1); the highest volumetric productivity reported so far for fermentative production of GABA from glucose in shake flasks was achieved.
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