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Xylose as preferred substrate for sarcosine production by recombinant Corynebacterium glutamicum.
Bioresource Technology 2019 Februrary 20
The aim of this work was to study the fermentative production of the N-methylated amino acid sarcosine by C. glutamicum. Characterization of the imine reductase DpkA from Pseudomonas putida revealed that it catalyses N-methylamination of glyoxylate to sarcosine. Heterologous expression of dpkA in a C. glutamicum strain engineered for glyoxylate overproduction enabled fermentative production of sarcosine from sugars and monomethylamine. Glucose-based fermentation reached sarcosine production titers of 2.4 ± 0.1 g L-1 . Sarcosine production based on the second generation feedstocks xylose and arabinose led to higher product titers of 2.7 ± 0.1 g L-1 and 3.4 ± 0.3 g L-1 , respectively, than glucose-based production. Optimization of production conditions with xylose and potassium acetate blends increased sarcosine titers to 8.7 ± 0.2 g L-1 with a yield of 0.25 g g-1 . This is the first example in which a C. glutamicum process using lignocellulosic pentoses is superior to glucose-based production.
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