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Cao M, Jiang T, Li P, Zhang Y, Guo S, Meng W, Lü C, Zhang W, Xu P, Gao C, Ma C. Pyruvate Production from Whey Powder by Metabolic Engineered Klebsiella oxytoca. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:15275-15283. [PMID: 33300786 DOI: 10.1021/acs.jafc.0c06724] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Pyruvate is an important platform material widely used in food, pharmaceutical, and chemical industries. Pyruvate-tolerant Klebsiella oxytoca PDL-0 was chosen as a chassis for pyruvate production via metabolic engineering. Genes related to by-product generation were knocked out to decrease the production of 2,3-butantediol, acetate, ethanol, and succinate. The NADH oxidase encoding gene nox was inserted into the locus of the lactate dehydrogenase encoding gene ldhD in the genome of K. oxytoca to simultaneously block lactate production and regenerate NAD+. The pyruvate importers CstA and YjiY were identified, and their encoding genes were deleted to increase pyruvate accumulation. The engineered strain K. oxytoca PDL-YC produced 71.0 g/L pyruvate from glucose. Furthermore, K. oxytoca PDL-YC can use whey powder, an abundant by-product of the cheese making process, as substrate for pyruvate production. Pyruvate production with a concentration of 62.3 g/L and a productivity of 1.60 g/[L·h] was realized using whey powder as substrate.
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Affiliation(s)
- Menghao Cao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Tongtong Jiang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
- Tumen Inspection and Testing Center, Tumen, Jilin 133100, People's Republic of China
| | - Ping Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Yipeng Zhang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Shiting Guo
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Wensi Meng
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Chuanjuan Lü
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Wen Zhang
- Center for Gene and Immunotherapy, The Second Hospital of Shandong University, Jinan 250033, People's Republic of China
| | - Ping Xu
- State Key Laboratory of Microbial Metabolism, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Chao Gao
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
| | - Cuiqing Ma
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People's Republic of China
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