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Synthesis of L-threo-2,3-Dihydroxyphenylserine (L-threo-DOPS) by Thermostable L-Threonine Aldolase Expressed in Corynebacterium glutamicum R  

Baik, Sang-Ho (Department of Food Science and Human Nutrition, and Research Institute of Human Ecology, Chonbuk National University)
Publication Information
Microbiology and Biotechnology Letters / v.36, no.2, 2008 , pp. 128-134 More about this Journal
Abstract
In order to examine efficient L-threo-2,3-Dihydroxyphenylserine (L-threo-DOPS) synthesis process using whole cell biocatalyst, a thermostable L-threonine aldolase (L-TA), which cloned from Streptomyces coelicolor A3(2) and improved for stability, was expressed in a Corynebacterium glutamicum R strain. The constructed Corynebacterium expression vector, pCG-H44(1) successfully expressed L-TA in C. glutamicum R strain, but showed very low expression level. In order to improve the expression level, the expression vector named pCG-H44(2) was reconstructed by eliminating 1 nucleotide between SD sequence and start codon of L-TA. The pCG-H44(2) vector plasmid was able to overexpress L-TA approximately 3.2 times higher than pCG-H44(1) in C. glutamicum R strain (CGH-2). When the whole cell of CGH-2 was examined in a repeated batch system, L-threo-DOPS was successfully synthesized with a yield of 4.0 mg/ml and maintain synthesis rate constantly after 30 repeated batch reactions for 130 h.
Keywords
L-threo-2,3-Dihydroxyphenylserine; L-threonine aldolase; whole cell conversion; Corynebacterium;
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