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Molecules 2017, 22(11), 1966; doi:10.3390/molecules22111966

Enantioselective Biosynthesis of l-Phenyllactic Acid by Whole Cells of Recombinant Escherichia coli

1,2
,
1,3
,
1
,
1
,
1,2
and
1,2,*
1
School of Biotechnology and Food Engineering, Changshu Institute of Technology, Changshu 215500, China
2
Key Laboratory of Food and Biotechnology of Suzhou, Changshu Institute of Technology, Changshu 215500, China
3
College of Food Science and Engineering, Jilin Agricultural University, Changchun 130118, China
*
Author to whom correspondence should be addressed.
Received: 25 October 2017 / Revised: 6 November 2017 / Accepted: 6 November 2017 / Published: 15 November 2017
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Abstract

Background: l-Phenyllactic acid (l-PLA)—a valuable building block in the pharmaceutical and chemical industry—has recently emerged as an important monomer in the composition of the novel degradable biocompatible material of polyphenyllactic acid. However, both normally chemically synthesized and naturally occurring phenyllactic acid are racemic, and the product yields of reported l-PLA synthesis processes remain unsatisfactory. Methods: We developed a novel recombinant Escherichia coli strain, co-expressing l-lactate dehydrogenase (l-LDH) from Lactobacillus plantarum subsp. plantarum and glucose dehydrogenase (GDH) from Bacillus megaterium, to construct a recombinant oxidation/reduction cycle for whole-cell biotransformation of phenylpyruvic acid (PPA) into chiral l-PLA in an enantioselective and continuous manner. Results: During fed-batch bioconversion with intermittent PPA feeding, l-PLA yield reached 103.8 mM, with an excellent enantiomeric excess of 99.7%. The productivity of l-PLA was as high as 5.2 mM·h−1 per OD600 (optical density at 600 nm) of whole cells. These results demonstrate the efficient production of l-PLA by the one-pot biotransformation system. Therefore, this stereoselective biocatalytic process might be a promising alternative for l-PLA production. View Full-Text
Keywords: l-Phenyllactic acid; l-Lactate dehydrogenase; glucose dehydrogenase; NADH regeneration; whole-cell transformation l-Phenyllactic acid; l-Lactate dehydrogenase; glucose dehydrogenase; NADH regeneration; whole-cell transformation
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Zhu, Y.; Wang, Y.; Xu, J.; Chen, J.; Wang, L.; Qi, B. Enantioselective Biosynthesis of l-Phenyllactic Acid by Whole Cells of Recombinant Escherichia coli. Molecules 2017, 22, 1966.

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