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Hu P, Peng C, Zhang B, Hu X, Milon RB, Ren L. Enhancing menaquinone-7 biosynthesis through strengthening precursor supply and product secretion. Bioprocess Biosyst Eng 2024; 47:211-222. [PMID: 38153563 DOI: 10.1007/s00449-023-02955-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/19/2023] [Indexed: 12/29/2023]
Abstract
Menaquinone-7 (MK-7) is an important class of vitamin K2 that is essential in human health and can prevent osteoporosis and cardiovascular disease. However, due to the complex synthesis pathway, the synthesis efficiency is low. The main objective of this study was to explore the effect of enhanced supply of precursors in Bacillus natto. Three precursors of pyruvate, shikimic acid, and sodium glutamate were chosen to investigate the effect of enhanced supply of precursors on MK-7 synthesis. Then, the optimal concentrations, different combinations, and different adding times were systematically studied, respectively. Results showed that the combination of shikimic acid and sodium glutamate could boost MK-7 production by 2 times, reaching 50 mg/L of MK-7 titer and 0.52 mg/(L·h) of MK-7 productivity. Furthermore, adding shikimic acid and sodium glutamate initially and feeding pyruvate at 48 h and 72 h increased MK-7 production to 58 mg/L. At the same time, the expression of the three related genes was also significantly upregulated. Subsequently, a new fermentation strategy combining the precursors enhancement and product secretion was proposed to enhance MK-7 yield and MK-7 productivity to 63 mg/L and 0.45 mg/(L·h). This study proposed a new fermentation regulation strategy for the enhancement of vitamin K2 biosynthesis.
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Affiliation(s)
- Pengchen Hu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China
| | - Cheng Peng
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China
| | - Bei Zhang
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China
| | - Xuechao Hu
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China
- Shanghai JanStar Technology Development Co., Ltd., No. 1288, Huateng Road, Shanghai, People's Republic of China
| | - Ripon Baroi Milon
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China
| | - Lujing Ren
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 30 South Puzhu Road, Nanjing, 211816, People's Republic of China.
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Chen L, Wang C, Su J. Understanding the Effect of Different Glucose Concentrations in the Oligotrophic Bacterium Bacillus subtilis BS-G1 through Transcriptomics Analysis. Microorganisms 2023; 11:2401. [PMID: 37894061 PMCID: PMC10609351 DOI: 10.3390/microorganisms11102401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/16/2023] [Accepted: 09/22/2023] [Indexed: 10/29/2023] Open
Abstract
Glucose is an important carbon source for microbial growth, and its content in infertile soils is essential for the growth of bacteria. Since the mechanism of oligotrophic bacterium adaptation in barren soils is unclear, this research employed RNA-seq technology to examine the impact of glucose concentration on the oligotrophic bacterium B. subtilis BS-G1 in soil affected by desertification. A global transcriptome analysis (RNA-Seq) revealed that the significantly differentially expressed genes (DEGs) histidine metabolism, glutamate synthesis, the HIF-1 signaling pathway, sporulation, and the TCA cycle pathway of B. subtilis BS-G1 were significantly enriched with a 0.015 g/L glucose concentration (L group), compared to a 10 g/L glucose concentration (H group). The DEGs amino acid system, two-component system, metal ion transport, and nitrogen metabolism system of B. subtilis BS-G1 were significantly enriched in the 5 g/L glucose concentration (M group), compared with the H group. In addition, the present study identified the regulation pattern and key genes under a low-glucose environment (7 mRNAs and 16 sRNAs). This study primarily investigates the variances in the regulatory pathways of the oligotrophic B. subtilis BS-G1, which holds substantial importance in comprehending the mechanism underlying the limited sugar tolerance of oligotrophic bacteria.
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Affiliation(s)
- Liping Chen
- Key Laboratory of Ministry of Education for Protection and Utilization of Special Biological Resources, School of Life Sciences, Ningxia University, Yinchuan 750021, China
| | - Chenglong Wang
- Key Laboratory of Ministry of Education for Protection and Utilization of Special Biological Resources, School of Life Sciences, Ningxia University, Yinchuan 750021, China
| | - Jianyu Su
- Key Laboratory of Ministry of Education for Protection and Utilization of Special Biological Resources, School of Life Sciences, Ningxia University, Yinchuan 750021, China
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Cheng Q, Li Z, Zhang J, Guo H, Ahmat M, Cheng J, Abbas Z, Hua Z, Wang J, Tong Y, Yang T, Si D, Zhang R. Soybean Oil Regulates the Fatty Acid Synthesis II System of Bacillus amyloliquefaciens LFB112 by Activating Acetyl-CoA Levels. Microorganisms 2023; 11:1164. [PMID: 37317138 DOI: 10.3390/microorganisms11051164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 04/14/2023] [Accepted: 04/18/2023] [Indexed: 06/16/2023] Open
Abstract
[Background] Bacillus LFB112 is a strain of Bacillus amyloliquefaciens screened in our laboratory. Previous studies found that it has a strong ability for fatty acid metabolism and can improve the lipid metabolism of broilers when used as feed additives. [Methods] This study aimed to confirm the fatty acid metabolism of Bacillus LFB112. Sterilized soybean oil (SSO) was added to the Beef Peptone Yeast (BPY) medium, and its effect on fatty acid content in the supernatant and bacteria, as well as expression levels of genes related to fatty acid metabolism, were studied. The control group was the original culture medium without oil. [Results] Acetic acid produced by the SSO group of Bacillus LFB112 decreased, but the content of unsaturated fatty acids increased. The 1.6% SSO group significantly increased the contents of pyruvate and acetyl-CoA in the pellets. Furthermore, the mRNA levels of enzymes involved in the type II fatty acid synthesis pathway of FabD, FabH, FabG, FabZ, FabI, and FabF were up-regulated. [Conclusions] Soybean oil increased the content of acetyl-CoA in Bacillus LFB112, activated its type II fatty acid synthesis pathway, and improved the fatty acid metabolism level of Bacillus LFB112. These intriguing results pave the way for further investigations into the intricate interplay between Bacillus LFB112 and fatty acid metabolism, with potential applications in animal nutrition and feed additive development.
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Affiliation(s)
- Qiang Cheng
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Zhongxuan Li
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
- College of Bioengineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Jing Zhang
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Henan Guo
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Marhaba Ahmat
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
- Xinjiang Laboratory of Special Environmental Microbiology, Institute of Applied Microbiology, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China
| | - Junhao Cheng
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Zaheer Abbas
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Zhengchang Hua
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Junyong Wang
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Yucui Tong
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Tiantian Yang
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Dayong Si
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
| | - Rijun Zhang
- State Key Laboratory of Animal Nutrition, Laboratory of Feed Biotechnology, College of Animal Science & Technology, China Agricultural University, Beijing 100193, China
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