Add time:08/21/2019         Source:sciencedirect.com

The aim of this work was to study the fermentative production of the N-methylated amino acid Sarcosine (cas 107-97-1) 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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