Biotechnology and Bioprocess Engineering 2020; 25(1): 45-52  
Enhanced Production of 2,3-Butanediol in Recombinant Escherichia coli Using Response Regulator DR1558 Derived from Deinococcus radiodurans
Seong-Ju Park1,†, Yu Jung Sohn2,†, Si Jae Park2,*, and Jong-il Choi1,*
1Department of Biotechnology and Engineering, Interdisciplinary Program of Bioenergy and Biomaterials, Chonnam National University, Gwangju 61186, Korea
2Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Korea
Correspondence to: Jong-il Choi*
Department of Biotechnology and Engineering, Interdisciplinary Program of Bioenergy and Biomaterials, Chonnam National University, Gwangju 61186, Korea
Tel: +82-62-530-1846; Fax: +82-62-530-1949
E-mail: choiji01@chonnam.ac.kr
Si Jae Park*
Division of Chemical Engineering and Materials Science, Ewha Womans University, Seoul 03760, Korea
Tel: +82-2-3277-4756; Fax: +82-2-3277-3275
E-mail: parksj93@ewha.ac.kr

These authors contributed equally to this work.
Received: July 28, 2019; Revised: September 16, 2019; Accepted: September 27, 2019; Published online: February 29, 2020.
© The Korean Society for Biotechnology and Bioengineering. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
2,3-Butanediol (2,3-BDO) is a promising bio-based chemical for its wide range of applications in industrial areas as synthetic rubber precursor, food additives, and cosmetics. In this study, Escherichia coli DH5α was metabolically engineered for enhanced production of 2,3-BDO by expressing Bacillus subtilis alsS, alsD, and ydjL genes encoding α-acetolactate synthase, α-acetolactate decarboxylase, and acetoin reductase/2,3-butanediol dehydrogenase, respectively, along with Deinococcus radiodurans dr1558 gene encoding a response regulator. When recombinant E. coli DH5α strain expressing only B. subtilis alsS, alsD, ydjL genes was cultured in LB medium containing 20 g/L glucose, 3.14 g/L of 2,3-BDO was produced. Additional expression of D. radiodurans dr1558 gene in E. coli DH5α expressing alsS, alsD, and ydjL genes resulted in the production of 7.81 g/L of 2,3-BDO under the same culture conditions, which is 2.5 fold higher than that produced by the strain without DR1558. Transcriptional analysis of E. coli DH5α expressing DR1558 suggested that the expression levels of the genes related to 2,3-BDO pathways were enhanced, while those of genes related to by-product pathways were suppressed, compared with control strain expressing only 2,3-BDO synthesis genes. These results strongly suggest that introduction of the stress tolerant response regulator DR1558 can modulate metabolic pathways to favor production of the target product.
Keywords: 2,3-butanediol, response regulator, DR1558, Escherichia coli, Deinococcus radiodurans


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