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Zhang Y, Zhang G, Zhang H, Tian Y, Li J, Yun J, Zabed HM, Qi X. Efficient Fermentative Production of β-Alanine from Glucose through Multidimensional Engineering of Escherichia coli. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:14274-14283. [PMID: 38867465 DOI: 10.1021/acs.jafc.4c03492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
β-Alanine, a valuable β-type amino acid, is experiencing increased demand due to its multifaceted applications in food flavoring, nutritional supplements, pharmaceuticals, and the chemical industry. Nevertheless, the sustainable biosynthesis of β-alanine currently faces challenges due to the scarcity of robust strains, attributed to the complexities of modulating multiple genes and the inherent physiological constraints. Here, systems metabolic engineering was implemented in Escherichia coli to overcome these limitations. First, an efficient l-aspartate-α-decarboxylase (ADC) was recruited for β-alanine biosynthesis. To conserve phosphoenolpyruvate flux, we subsequently modified the endogenous glucose assimilation system by inactivating the phosphotransferase system (PTS) and introducing an alternative non-PTS system, which increased β-alanine production to 1.70 g/L. The supply of key precursors, oxaloacetate and l-aspartate, was synergistically improved through comprehensive modulation, including strengthening main flux and blocking bypass metabolism, which significantly increased the β-alanine titer to 3.43 g/L. Next, the expression of ADC was optimized by promoter and untranslated region (UTR) engineering. Further transport engineering, which involved disrupting β-alanine importer CycA and heterologously expressing β-alanine exporter NCgI0580, improved β-alanine production to 8.48 g/L. Additionally, corn steep liquor was used to develop a cost-effective medium. The final strain produced 74.03 g/L β-alanine with a yield of 0.57 mol/mol glucose during fed-batch fermentation.
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Affiliation(s)
- Yufei Zhang
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, P. R. China
| | - Guoyan Zhang
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, P. R. China
| | - Huifang Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, P. R. China
| | - Yuehui Tian
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
| | - Jia Li
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
| | - Junhua Yun
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
| | - Hossain M Zabed
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
| | - Xianghui Qi
- School of Life Sciences, Guangzhou University, 230 Wai Huan Xi Road, Guangzhou 510006, Guangdong, P. R. China
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, P. R. China
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Batista RS, Chaves GL, Oliveira DB, Pantaleão VL, Neves JDDS, da Silva AJ. Glycerol as substrate and NADP +-dependent glyceraldehyde-3-phosphate dehydrogenase enable higher production of 3-hydroxypropionic acid through the β-alanine pathway in E. coli. BIORESOURCE TECHNOLOGY 2024; 393:130142. [PMID: 38049020 DOI: 10.1016/j.biortech.2023.130142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 11/28/2023] [Accepted: 11/28/2023] [Indexed: 12/06/2023]
Abstract
Microbial engineering is a promising way to produce3-HP using biorenewable substrates such as glycerol. However, theglycerol pathway to obtain 3-HPrequires vitamin B-12, which hinders its economic viability. The present work showed that 3-HP can be efficiently produced from glycerol through the β-alanine pathway. To develop a cell factory for this purpose, glycerol was evaluated as a substrate and showed more than two-fold improved 3-HP production compared to glucose. Next, the reducing power was modulated by overexpression of an NADP+ -dependent glyceraldehyde-3-phosphate dehydrogenase coupled with CRISPR-based repression of the endogenous gapA gene, resulting in a 91 % increase in 3-HP titer. Finally, the toxicity of 3-HP accumulation was addressed by overexpressing a putative exporter (YohJK). Fed-batch cultivation of the final strain yielded 72.2 g/L of 3-HP and a productivity of 1.64 g/L/h, which are the best results for the β-alanine pathway and are similar to those found for other pathways.
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Affiliation(s)
- Raquel Salgado Batista
- Graduate Program of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil
| | - Gabriel Luz Chaves
- Graduate Program of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil
| | - Davi Benedito Oliveira
- Graduate Program of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil
| | - Vitor Leonel Pantaleão
- Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil
| | - José Davi Dos Santos Neves
- Graduate Program of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil
| | - Adilson José da Silva
- Graduate Program of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil; Department of Chemical Engineering, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, São Paulo 13565-905, Brazil.
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Ravi SN, Sankaranarayanan M. Enhanced synthesis of 3-hydroxypropionic acid by eliminating by-products using recombinant Escherichia coli as a whole cell biocatalyst. Top Catal 2023. [DOI: 10.1007/s11244-023-01796-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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