Abstract
An Escherichia coli-engineered bacterium with cis-epoxysuccinate hydrolase (ESH) activity was used to catalyze the stereospecific hydrolysis of cis-epoxysuccinic acid to l-(+)-tartaric acid. The effect of the substrate composition on the production efficiency of l-(+)-tartaric acid was investigated. Based on the sodium-type homogeneous substrate system, a heterogeneous substrate system, composed of 1.2 M sodium-type substrate and 1.8 M calcium-type substrate, was designed to improve ESH catalytic efficiency. After process optimization, a catalytic efficiency of 9.37 × 10−3 g U−1 h−1 was obtained with fed-batch mode in the heterogeneous substrate system, about a twofold increase compared to the traditional bioconversion process with Nocardia tartaricans cells. The scale-up tests were carried out in a 15-m3 stirred tank reactor, which indicated that the heterogeneous substrate system had great application prospect for the l-(+)-tartaric acid industrial production.
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This work was supported by the Major State Basic Research Development Program of China (No. 2013CB733604).
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Wang, Z., Wang, Y., Shi, H. et al. Improvement of the Production Efficiency of l-(+)-Tartaric Acid by Heterogeneous Whole-Cell Bioconversion. Appl Biochem Biotechnol 172, 3989–4001 (2014). https://doi.org/10.1007/s12010-014-0830-5
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DOI: https://doi.org/10.1007/s12010-014-0830-5