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Zheng J, You J, Zhang D, Zhang X, Chen F, Yang T, Xu M, Hu Y, Rao Z. Pre-optimization and one-step preparation of cascade enzymes system with broad substrates by model guidance: Application of chiral L-norvaline and L-phenylglycine biosynthesis. BIORESOURCE TECHNOLOGY 2024; 393:130125. [PMID: 38040317 DOI: 10.1016/j.biortech.2023.130125] [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: 11/08/2023] [Revised: 11/27/2023] [Accepted: 11/27/2023] [Indexed: 12/03/2023]
Abstract
Cascade biocatalyst systems with catalytic promiscuity can be used for synthesis of a class of chiral chemicals but the optimization of these systems by model guidance is poorly explored. In this study, a cascade system with broad substrate spectrum was characterized and simulated by kinetic model with substrates of DL-Norvaline (DL-Nor) and DL-Phenylglycine (DL-Phg) as examples. To evaluate the optimal cascade system, maximum accumulation of intermediate products and conversion rate in the process were investigated by simultaneous solution of the rate equations for varying enzyme quantities. According to the simulation results, the cascade system was optimized by regulating the expression of D-amino acid oxidase and formate dehydrogenase and was prepared by one-step. The conversion efficiency of DL-Nor and DL-Phg have been significantly improved compared with that of before optimization. Moreover, the total of L-Nor and L-Phg were reached 498.2 mM and 79.5 mM through a gradient fed-batch conversion strategy, respectively.
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Affiliation(s)
- Junxian Zheng
- School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, Fujian, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Jiajia You
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing 214200, China
| | - Danfeng Zhang
- School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, Fujian, China
| | - Xian Zhang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing 214200, China
| | - Fan Chen
- School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, Fujian, China
| | - Taowei Yang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing 214200, China
| | - Meijuan Xu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing 214200, China
| | - Yuanqing Hu
- School of Biological Science and Biotechnology, Minnan Normal University, Zhangzhou 363000, Fujian, China
| | - Zhiming Rao
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China; Yixing Institute of Food and Biotechnology Co., Ltd, Yixing 214200, China.
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2
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Jiang M, Liu Y, Xue H, Wang Y, Wang C, Yang F, Li X. Expression and biochemical characterization of a Bacillus subtilis catalase in Pichia pastoris X-33. Protein Expr Purif 2023; 208-209:106277. [PMID: 37100104 DOI: 10.1016/j.pep.2023.106277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 04/28/2023]
Abstract
Catalase, which catalyzes the decomposition of H2O2 to H2O and O2, is widely used to reduce H2O2 in industrial applications, such as in food processing, textile dyeing and wastewater treatment. In this study, the catalase (KatA) from Bacillus subtilis was cloned and expressed in the yeast Pichia pastoris X-33. The effect of the promoter in the expression plasmid on the activity level of the secreted KatA protein was also studied. First, the gene encoding KatA was cloned and inserted into a plasmid containing an inducible alcohol oxidase 1 promoter (pAOX1) or a constitutive glyceraldehyde-3-phosphate dehydrogenase promoter (pGAP). The recombinant plasmids were validated by colony PCR and sequencing and then linearized and transformed into the yeast P. pastoris X-33 for expression. With the promoter pAOX1, the maximum yield of KatA in the culture medium reached 338.8 ± 9.6 U/mL in 2 days of shake flask cultivation, which was approximately 2.1-fold greater than the maximum yield obtained with the promoter pGAP. The expressed KatA was then purified from the culture medium by anion exchange chromatography, and its specific activity was determined to be 14826.58 U/mg. Finally, the purified KatA exhibited optimum activity at 25 °C and pH 11.0. Its Km for hydrogen peroxide was 10.9 ± 0.5 mM, and its kcat/Km was 5788.1 ± 25.6 s-1 mM-1. Through the work presented in this article, we have therefore demonstrated efficient expression and purification of KatA in P. pastoris, which might be advantageous for scaling up the production of KatA for use in a variety of biotechnological applications.
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Affiliation(s)
- Mengtong Jiang
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China
| | - Yuxin Liu
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China
| | - Hongjian Xue
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China
| | - Yiqi Wang
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China
| | - Conggang Wang
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China.
| | - Fan Yang
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China.
| | - Xianzhen Li
- School of Biological Engineering, Dalian Polytechnic University, Dalian, 116034, China
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Pan S, Wang G, Fan Y, Wang X, Liu J, Guo M, Chen H, Zhang S, Chen G. Enhancing the compost maturation of deer manure and corn straw by supplementation via black liquor. Heliyon 2023; 9:e13246. [PMID: 36755604 PMCID: PMC9900273 DOI: 10.1016/j.heliyon.2023.e13246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 12/06/2022] [Accepted: 01/23/2023] [Indexed: 01/29/2023] Open
Abstract
In this paper, the relationship between black liquor and microbial growth, enzymatic secretion and humus formation in composting was studied. The results showed that black liquor inoculation is an effective way to promote fermentation process. After black liquor inoculation, the abundance of Corynebacterium, Aequorivita, and Pedobacter, which have the catalase and oxidase activity, has been significantly increased. The enzymatic activity of alkaline phosphatase, catalase, peroxidase and invertase was 40 mg/(g·24h), 6.5 mg/(g·20 min), 13 100 mg/(g·24h), and 6100 mg/(g·24h) respectively at day 18. Humic acid and fulvic acid concentration was 12 g/kg and 11 g/kg which is higher than that of the treatments of no black liquor inoculation. The results suggested that black liquor inoculation was beneficial to indigenous microorganisms reproduce efficiently, then the secretion of enzymes related to cellulose, hemicellulose, and lipid hydrolysis, and the formation of humic substances.
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Affiliation(s)
- Shijun Pan
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China
| | - Gang Wang
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China,Key Laboratory of Straw Comprehensive Utilization and Black Land Conservation, Education Ministry of China, Jilin Agricultural University, Jilin, 130118, China,Corresponding author. College of Life Science, Jilin Agricultural University, Jilin, 130118, China.
| | - Yide Fan
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China
| | - Xiqing Wang
- College of Food Science Technology and Chemical Engineering, Hubei University of Arts and Science, Hubei, 430000, China
| | - Juan Liu
- Sericultural Research Institute of Jilin Province, Jilin, China
| | | | - Huan Chen
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China
| | - Sitong Zhang
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China
| | - Guang Chen
- College of Life Science, Jilin Agricultural University, Jilin, 130118, China,Key Laboratory of Straw Comprehensive Utilization and Black Land Conservation, Education Ministry of China, Jilin Agricultural University, Jilin, 130118, China
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4
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Choi H, Yeo M, Kang Y, Kim HJ, Park SG, Jang E, Park SH, Kim E, Kang S. Lactate oxidase/catalase-displaying nanoparticles efficiently consume lactate in the tumor microenvironment to effectively suppress tumor growth. J Nanobiotechnology 2023; 21:5. [PMID: 36597089 PMCID: PMC9811728 DOI: 10.1186/s12951-022-01762-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 12/27/2022] [Indexed: 01/04/2023] Open
Abstract
The aggressive proliferation of tumor cells often requires increased glucose uptake and excessive anaerobic glycolysis, leading to the massive production and secretion of lactate to form a unique tumor microenvironment (TME). Therefore, regulating appropriate lactate levels in the TME would be a promising approach to control tumor cell proliferation and immune suppression. To effectively consume lactate in the TME, lactate oxidase (LOX) and catalase (CAT) were displayed onto Aquifex aeolicus lumazine synthase protein nanoparticles (AaLS) to form either AaLS/LOX or AaLS/LOX/CAT. These complexes successfully consumed lactate produced by CT26 murine colon carcinoma cells under both normoxic and hypoxic conditions. Specifically, AaLS/LOX generated a large amount of H2O2 with complete lactate consumption to induce drastic necrotic cell death regardless of culture condition. However, AaLS/LOX/CAT generated residual H2O2, leading to necrotic cell death only under hypoxic condition similar to the TME. While the local administration of AaLS/LOX to the tumor site resulted in mice death, that of AaLS/LOX/CAT significantly suppressed tumor growth without any severe side effects. AaLS/LOX/CAT effectively consumed lactate to produce adequate amounts of H2O2 which sufficiently suppress tumor growth and adequately modulate the TME, transforming environments that are favorable to tumor suppressive neutrophils but adverse to tumor-supportive tumor-associated macrophages. Collectively, these findings showed that the modular functionalization of protein nanoparticles with multiple metabolic enzymes may offer the opportunity to develop new enzyme complex-based therapeutic tools that can modulate the TME by controlling cancer metabolism.
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Affiliation(s)
- Hyukjun Choi
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Mirae Yeo
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Yujin Kang
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Hyo Jeong Kim
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Seong Guk Park
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Eunjung Jang
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Sung Ho Park
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Eunhee Kim
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
| | - Sebyung Kang
- grid.42687.3f0000 0004 0381 814XDepartment of Biological Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919 South Korea
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Yang H, Qu J, Zou W, Shen W, Chen X. An overview and future prospects of recombinant protein production in Bacillus subtilis. Appl Microbiol Biotechnol 2021; 105:6607-6626. [PMID: 34468804 DOI: 10.1007/s00253-021-11533-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 08/12/2021] [Accepted: 08/15/2021] [Indexed: 12/27/2022]
Abstract
Bacillus subtilis is a well-characterized Gram-positive bacterium and a valuable host for recombinant protein production because of its efficient secretion ability, high yield, and non-toxicity. Here, we comprehensively review the recent studies on recombinant protein production in B. subtilis to update and supplement other previous reviews. We have focused on several aspects, including optimization of B. subtilis strains, enhancement and regulation of expression, improvement of secretion level, surface display of proteins, and fermentation optimization. Among them, optimization of B. subtilis strains mainly involves undirected chemical/physical mutagenesis and selection and genetic manipulation; enhancement and regulation of expression comprises autonomous plasmid and integrated expression, promoter regulation and engineering, and fine-tuning gene expression based on proteases and molecular chaperones; improvement of secretion level predominantly involves secretion pathway and signal peptide screening and optimization; surface display of proteins includes surface display of proteins on spores or vegetative cells; and fermentation optimization incorporates medium optimization, process condition optimization, and feeding strategy optimization. Furthermore, we propose some novel methods and future challenges for recombinant protein production in B. subtilis.Key points• A comprehensive review on recombinant protein production in Bacillus subtilis.• Novel techniques facilitate recombinant protein expression and secretion.• Surface display of proteins has significant potential for different applications.
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Affiliation(s)
- Haiquan Yang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
| | - Jinfeng Qu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Wei Zou
- College of Bioengineering, Sichuan University of Science & Engineering, Yibin, 644000, Sichuan, China
| | - Wei Shen
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Xianzhong Chen
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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Ji M, Liu Y, Wu H, Li S, Duan H, Shi J, Sun J. Engineering Bacillus subtilis ATCC 6051a for the production of recombinant catalases. J Ind Microbiol Biotechnol 2021; 48:6177681. [PMID: 33734388 PMCID: PMC9113483 DOI: 10.1093/jimb/kuab024] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/13/2021] [Indexed: 11/14/2022]
Abstract
Catalases are a large group of enzymes that decompose hydrogen peroxide to oxygen and hydrogen, and have been applied widely in numerous areas. Bacillus subtilis ATCC 6051a is a well-known host strain for high level secretion of heterologous peptides. However, the application of 6051a was seriously hampered by insufficient transformation efficiency. In this study, D-xylose inducible comK was integrated into the genome of B. subtilis ATCC 6051a, generating 164S, a mutant owns a transformation efficiency of 1 000-fold higher than its parent strain, thus allowing gene replacement by double crossover recombination using linear dsDNAs. The efficiency of the flanking arms for homologous recombination was then analyzed. We found that 400 bp was the minimal length of homologous fragments required to initiate efficient recombination in the 164S strain. In addition, DNA cassettes encoding two mesophilic catalases (Orf 2-62 and Orf 2-63) from B. licheniformis were integrated onto 164S. The catalytic properties of recombinant Orf 2-62 and Orf 2-63 were analyzed, and were found to be predominantly secreted into the fermentation broth, although they obviously lack any known secretory signal peptide. This work demonstrated that B. subtilis 164S is an excellent cell tool, not only for its superior secretion capacity, but also for its convenience in genetic modification.
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Affiliation(s)
- Minghua Ji
- Lab of Biorefinery, Shanghai Advanced Research Institute, Chinese Academy of Sciences, No. 99 Haike Road, Pudong, Shanghai 201210, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunhui Liu
- Lab of Biorefinery, Shanghai Advanced Research Institute, Chinese Academy of Sciences, No. 99 Haike Road, Pudong, Shanghai 201210, China
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Haiying Wu
- Materials and Physical Biology Division School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Sijie Li
- Lab of Biorefinery, Shanghai Advanced Research Institute, Chinese Academy of Sciences, No. 99 Haike Road, Pudong, Shanghai 201210, China
| | - Haiyan Duan
- Lab of Biorefinery, Shanghai Advanced Research Institute, Chinese Academy of Sciences, No. 99 Haike Road, Pudong, Shanghai 201210, China
- School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China
| | - Jiping Shi
- Correspondence should be addressed to: Jiping Shi. Phone: +86-21-20325163. E-mail:
| | - Junsong Sun
- Correspondence should be addressed to: Junsong Sun. Phone: +86-21-20325163. E-mail:
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7
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Samson M, Yang T, Omar M, Xu M, Zhang X, Alphonse U, Rao Z. Improved thermostability and catalytic efficiency of overexpressed catalase from B. pumilus ML 413 (KatX2) by introducing disulfide bond C286-C289. Enzyme Microb Technol 2018; 119:10-16. [DOI: 10.1016/j.enzmictec.2018.08.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Revised: 06/25/2018] [Accepted: 08/08/2018] [Indexed: 01/14/2023]
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8
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Zhao X, Xu J, Tan M, Yu Z, Yang S, Zheng H, Song H. Construction of a plasmid interspecific transfer system in Bacillus species with the counter-selectable marker mazF. J Ind Microbiol Biotechnol 2018; 45:417-428. [PMID: 29737437 DOI: 10.1007/s10295-018-2038-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/25/2018] [Indexed: 11/29/2022]
Abstract
Bacillus sp. strains as attractive hosts for the production of heterologous secretory proteins usually play important roles in bio-industry. However, low transformation efficiency of exogenous plasmids limited the application of Bacillus species. Here, a novel plasmid interspecific transfer system, with high transformation efficiency, high positive rate, and convenient manipulation, has been successfully constructed. A high electrotransformation efficiency strain Bacillus subtilis F-168 containing the counter-selectable marker mazF was used as the plasmid donor strain in this transfer method. A shuttled plasmid pBE980 and its recombinant plasmids pBE980::pulA and pBE980::HSPA were successfully transferred into the recipient Bacillus strains (Bacillus amyloliquefaciens 66, Bacillus licheniformis 124 and Bacillus megaterium 258) by this method. After co-culturing the donor cells (OD600nm = 1.3-1.7) and the recipient cells (OD600nm = 0.5-0.9) for 24 h in 22 °C, more than 1.0 × 105 positive transformants were obtained and a interspecific transformation efficiency of 1.0 × 10-3. It would provide a new approach for genetic manipulation in Bacillus strains and accelerate the research progress of the wild Bacillus strains in bio-industry.
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Affiliation(s)
- XingYa Zhao
- University of Chinese Academy of Sciences, Beijing, 100049, China.,Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - JianYong Xu
- Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,Tianjin Key Laboratory for Industrial Biological, Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Ming Tan
- Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.,Tianjin Key Laboratory for Industrial Biological, Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - ZhenXiao Yu
- University of Chinese Academy of Sciences, Beijing, 100049, China.,Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - ShiBin Yang
- University of Chinese Academy of Sciences, Beijing, 100049, China.,Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - HongChen Zheng
- Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China. .,Tianjin Key Laboratory for Industrial Biological, Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
| | - Hui Song
- University of Chinese Academy of Sciences, Beijing, 100049, China. .,Industrial Enzymes National Engineering Laboratory, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China. .,Tianjin Key Laboratory for Industrial Biological, Systems and Bioprocessing Engineering, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China.
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Li L, Mu L, Wang X, Yu J, Hu R, Li Z. A novel expression vector for the secretion of abaecin in Bacillus subtilis. Braz J Microbiol 2017; 48:809-814. [PMID: 28651889 PMCID: PMC5628310 DOI: 10.1016/j.bjm.2017.01.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 01/03/2017] [Accepted: 01/31/2017] [Indexed: 11/03/2022] Open
Abstract
This study aimed to describe a Bacillus subtilis expression system based on genetically modified B. subtilis. Abaecin, an antimicrobial peptide obtained from Apis mellifera, can enhance the effect of pore-forming peptides from other species on the inhibition of bacterial growth. For the exogenous expression, the abaecin gene was fused with a tobacco etch virus protease cleavage site, a promoter Pglv, and a mature beta-glucanase signal peptide. Also, a B. subtilis expression system was constructed. The recombinant abaecin gene was expressed and purified as a recombinant protein in the culture supernatant. The purified abaecin did not inhibit the growth of Escherichia coli strain K88. Cecropin A and hymenoptaecin exhibited potent bactericidal activities at concentrations of 1 and 1.5μM. Combinatorial assays revealed that cecropin A and hymenoptaecin had sublethal concentrations of 0.3 and 0.5μM. This potentiating functional interaction represents a promising therapeutic strategy. It provides an opportunity to address the rising threat of multidrug-resistant pathogens that are recalcitrant to conventional antibiotics.
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Affiliation(s)
- Li Li
- College of Basic Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
| | - Lan Mu
- College of Basic Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Xiaojuan Wang
- College of Basic Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Jingfeng Yu
- College of Basic Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China
| | - Ruiping Hu
- College of Basic Medicine, Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
| | - Zhen Li
- College of Horticulture, China Agricultural University, Haidian District, Beijing, China
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10
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Shao M, Sha Z, Zhang X, Rao Z, Xu M, Yang T, Xu Z, Yang S. Efficient androst-1,4-diene-3,17-dione production by co-expressing 3-ketosteroid-Δ 1 -dehydrogenase and catalase in Bacillus subtilis. J Appl Microbiol 2017; 122:119-128. [PMID: 27797429 DOI: 10.1111/jam.13336] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 10/11/2016] [Accepted: 10/17/2016] [Indexed: 01/02/2023]
Abstract
AIMS 3-ketosteroid-Δ1 -dehydrogenase (KSDD), a flavin adenine dinucleotide (FAD)-dependent enzyme involved in sterol metabolism, specifically catalyses the conversion of androst-4-ene-3,17-dione (AD) to androst-1,4-diene-3,17-dione (ADD). However, the low KSDD activity and the toxic effects of hydrogen peroxide (H2 O2 ) generated during the biotransformation of AD to ADD with FAD regeneration hinder its application on AD conversion. The aim of this work was to improve KSDD activity and eliminate the toxic effects of the generated H2 O2 to enhance ADD production. METHODS AND RESULTS The ksdd gene obtained from Mycobacterium neoaurum JC-12 was codon-optimized to increase its expression level in Bacillus subtilis, and the KSDD activity reached 12·3 U mg-1 , which was sevenfold of that of codon-unoptimized gene. To improve AD conversion, catalase was co-expressed with KSDD in B. subtilis 168/pMA5-ksddopt -katA to eliminate the toxic effects of H2 O2 generated during AD conversion. Finally, under optimized bioconversion conditions, fed-batch strategy was carried out and the ADD yield improved to 8·76 g l-1 . CONCLUSIONS This work demonstrates the potential to improve enzyme activity by codon-optimization and eliminate the toxic effects of H2 O2 by co-expressing catalase. SIGNIFICANCE AND IMPACT OF THE STUDY This study showed the highest ADD productivity ever reported and provides a promising strain for efficient ADD production in the pharmaceutical industry.
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Affiliation(s)
- M Shao
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Z Sha
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - X Zhang
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Z Rao
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - M Xu
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - T Yang
- Laboratory of Applied Microorganisms and Metabolic Engineering, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu Province, China
| | - Z Xu
- Laboratory of Pharmaceutical Engineering, School of Pharmaceutical Sciences, Jiangnan University, Wuxi, Jiangsu Province, China
| | - S Yang
- Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, USA
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