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Senger J, Seitl I, Pross E, Fischer L. Secretion of the cytoplasmic and high molecular weight β-galactosidase of Paenibacillus wynnii with Bacillus subtilis. Microb Cell Fact 2024; 23:170. [PMID: 38867249 PMCID: PMC11167759 DOI: 10.1186/s12934-024-02445-7] [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: 01/18/2024] [Accepted: 05/30/2024] [Indexed: 06/14/2024] Open
Abstract
BACKGROUND The gram-positive bacterium Bacillus subtilis is widely used for industrial enzyme production. Its ability to secrete a wide range of enzymes into the extracellular medium especially facilitates downstream processing since cell disruption is avoided. Although various heterologous enzymes have been successfully secreted with B. subtilis, the secretion of cytoplasmic enzymes with high molecular weight is challenging. Only a few studies report on the secretion of cytoplasmic enzymes with a molecular weight > 100 kDa. RESULTS In this study, the cytoplasmic and 120 kDa β-galactosidase of Paenibacillus wynnii (β-gal-Pw) was expressed and secreted with B. subtilis SCK6. Different strategies were focused on to identify the best secretion conditions. Tailormade codon-optimization of the β-gal-Pw gene led to an increase in extracellular β-gal-Pw production. Consequently, the optimized gene was used to test four signal peptides and two promoters in different combinations. Differences in extracellular β-gal-Pw activity between the recombinant B. subtilis strains were observed with the successful secretion being highly dependent on the specific combination of promoter and signal peptide used. Interestingly, signal peptides of both the general secretory- and the twin-arginine translocation pathway mediated secretion. The highest extracellular activity of 55.2 ± 6 µkat/Lculture was reached when secretion was mediated by the PhoD signal peptide and expression was controlled by the PAprE promoter. Production of extracellular β-gal-Pw was further enhanced 1.4-fold in a bioreactor cultivation to 77.5 ± 10 µkat/Lculture with secretion efficiencies of more than 80%. CONCLUSION For the first time, the β-gal-Pw was efficiently secreted with B. subtilis SCK6, demonstrating the potential of this strain for secretory production of cytoplasmic, high molecular weight enzymes.
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Affiliation(s)
- Jana Senger
- Institute of Food Science and Biotechnology, Department of Biotechnology and Enzyme Science, University of Hohenheim, Garbenstr. 25, 70599, Stuttgart, Germany
| | - Ines Seitl
- Institute of Food Science and Biotechnology, Department of Biotechnology and Enzyme Science, University of Hohenheim, Garbenstr. 25, 70599, Stuttgart, Germany
| | - Eva Pross
- Institute of Food Science and Biotechnology, Department of Biotechnology and Enzyme Science, University of Hohenheim, Garbenstr. 25, 70599, Stuttgart, Germany
| | - Lutz Fischer
- Institute of Food Science and Biotechnology, Department of Biotechnology and Enzyme Science, University of Hohenheim, Garbenstr. 25, 70599, Stuttgart, Germany.
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Wang C, Niu D, Mchunu NP, Zhang M, Singh S, Wang Z. Secretory expression of amylosucrase in Bacillus licheniformis through twin-arginine translocation pathway. J Ind Microbiol Biotechnol 2024; 51:kuae004. [PMID: 38253396 PMCID: PMC10849164 DOI: 10.1093/jimb/kuae004] [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: 10/02/2023] [Accepted: 01/19/2024] [Indexed: 01/24/2024]
Abstract
Amylosucrase (EC 2.4.1.4) is a versatile enzyme with significant potential in biotechnology and food production. To facilitate its efficient preparation, a novel expression strategy was implemented in Bacillus licheniformis for the secretory expression of Neisseria polysaccharea amylosucrase (NpAS). The host strain B. licheniformis CBBD302 underwent genetic modification through the deletion of sacB, a gene responsible for encoding levansucrase that synthesizes extracellular levan from sucrose, resulting in a levan-deficient strain, B. licheniformis CBBD302B. Neisseria polysaccharea amylosucrase was successfully expressed in B. licheniformis CBBD302B using the highly efficient Sec-type signal peptide SamyL, but its extracellular translocation was unsuccessful. Consequently, the expression of NpAS via the twin-arginine translocation (TAT) pathway was investigated using the signal peptide SglmU. The study revealed that NpAS could be effectively translocated extracellularly through the TAT pathway, with the signal peptide SglmU facilitating the process. Remarkably, 62.81% of the total expressed activity was detected in the medium. This study marks the first successful secretory expression of NpAS in Bacillus species host cells, establishing a foundation for its future efficient production. ONE-SENTENCE SUMMARY Amylosucrase was secreted in Bacillus licheniformis via the twin-arginine translocation pathway.
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Affiliation(s)
- Caizhe Wang
- Department of Biological Chemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Dandan Niu
- Department of Biological Chemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Nokuthula Peace Mchunu
- National Research Foundation, PO Box 2600 Pretoria 0001, South Africa
- School of Life Science, University of KwaZulu Natal, Durban 4000, South Africa
| | - Meng Zhang
- Department of Biological Chemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Suren Singh
- Department of Biotechnology and Food Science, Faculty of Applied Sciences, Durban University of Technology, PO Box 1334, Durban 4001, South Africa
| | - Zhengxiang Wang
- Department of Biological Chemical Engineering, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
- Tianjin Key Laboratory of Industrial Microbiology, Tianjin 300457, China
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Wang L, Lyu Y, Miao X, Yin X, Zhang C. Enhanced protein glutaminase production from Chryseobacterium proteolyticum combining physico-chemical mutagenesis and resistance screening and its application to soybean protein isolates. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:4562-4572. [PMID: 36853147 DOI: 10.1002/jsfa.12535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/22/2023] [Accepted: 02/28/2023] [Indexed: 06/06/2023]
Abstract
BACKGROUND Protein glutaminase (PG) is a novel protein modification biotechnology that is increasingly being used in the food industry. However, the current level of fermentation of PG-producing strains still does not meet the requirements of industrial production. To obtain the mutant strains with high PG production, the atmospheric and room temperature plasma (ARTP) combined with LiCl chemical mutagen were used in mutagenesis of a PG producing Chryseobacterium proteolyticum 1003. RESULTS A mutant strain (WG15) was successfully obtained based on malonic acid resistance screening after compound mutagenesis of the starting strain C. proteolyticum 1003 using ARTP with LiCl, and it was confirmed to be genetically stable in PG synthesis after 15 generations. The protein glutaminase production of WG15 was 2.91 U mL-1 after optimization of fermentation conditions, which is 48.69% higher than the original strain C. proteolyticum 1003. The PG obtained from fermentation showed good activities in deamidation of soy protein isolate. The solubility and foaming properties of the PG-treated soy protein isolate were significantly increased by 36.50% and 10.03%, respectively, when PG was added at the amount of 100 U mL-1 . In addition, the emulsifying activity and emulsion stability of the treated soy protein isolate were improved by 12.44% and 10.34%, respectively, on the addition of 10 U mL-1 PG. The secondary structure of the soy protein isolate changed after PG treatment, with an increased proportion of glutamate. CONCLUSION The results of the present study indicate that the PG produced by this mutant strain could improve the functional properties of soybean protein isolate and the C. proteolyticum mutant WG15 has great potential in food industry. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Lijuan Wang
- Laboratory of Food Industrial Enzyme Technology, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Yunbin Lyu
- Laboratory of Food Industrial Enzyme Technology, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Xing Miao
- Laboratory of Food Industrial Enzyme Technology, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | | | - Chong Zhang
- Laboratory of Food Industrial Enzyme Technology, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
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Wei X, Yang L, Wang H, Chen Z, Xu Y, Weng Y, Cao M, Li Q, He N. Genomic and metabolomic analysis of Bacillus licheniformis with enhanced poly-γ-glutamic acid production through atmospheric and room temperature plasma mutagenesis. Front Chem Sci Eng 2022. [DOI: 10.1007/s11705-022-2211-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Qu R, Dai T, Wu J, Tian A, Zhang Y, Kang L, Ouyang W, Jin C, Niu J, Li Z, Chang Z, Jiang D, Huang J, Gao H. The characteristics of protein-glutaminase from an isolated Chryseobacterium cucumeris strain and its deamidation application. Front Microbiol 2022; 13:969445. [PMID: 36016794 PMCID: PMC9396377 DOI: 10.3389/fmicb.2022.969445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 07/21/2022] [Indexed: 11/13/2022] Open
Abstract
Protein-glutaminase (PG), a deamidation enzyme commercially derived from Chryseobacterium proteolyticum, is used to improve the solubility and other functional properties of food proteins. In this study, a new PG-producing strain, Chryseobacterium cucumeris ZYF120413-7, was isolated from soil, and it had a high PG yield and a short culture time. It gave the maximum PG activity with 0.557 U/ml on Cbz-Gln-Gly after 12 h of culture, indicating that it was more suitable for PG production. The enzyme activity recovery and purification fold were 32.95% and 161.95-fold, respectively, with a specific activity of 27.37 U/mg. The PG was a pre-pro-protein with a 16 amino acids putative signal peptide, a pro-PG of 118 amino acids, and a mature PG of 185 amino acids. The amino acid sequence identity of PG from strain ZYF120413-7 was 74 and 45%, respectively, to that of PG from C. proteolyticum 9670T and BH-PG. The optimum reaction pH and temperature of PG was 6 and 60°C, respectively. Enzyme activity was inhibited by Cu2+. The optimum PG substrate was Cbz-Gln-Gly, and the Km and Vmax values were 1.68 mM and 1.41 μM mg protein−1 min−1, respectively. Degree of deamidation (DD) of soy protein isolate (SPI) treated by purified PG was 40.75% within the first 2 h and 52.35% after 18 h. These results demonstrated that the PG from C. cucumeris ZYF120413-7 was a promising protein-deamidating enzyme for improving the functionality of food proteins.
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Affiliation(s)
- Ruidan Qu
- School of Life Sciences, East China Normal University, Shanghai, China
- School of Health & Social Care, Shanghai Urban Construction Vocational College, Shanghai, China
| | - Tian Dai
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Jiajing Wu
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Aitian Tian
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Yanfang Zhang
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Li Kang
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Wei Ouyang
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Congli Jin
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Jinjin Niu
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Zhen Li
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Zhongyi Chang
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Deming Jiang
- School of Life Sciences, East China Normal University, Shanghai, China
| | - Jing Huang
- School of Life Sciences, East China Normal University, Shanghai, China
- *Correspondence: Jing Huang,
| | - Hongliang Gao
- School of Life Sciences, East China Normal University, Shanghai, China
- Hongliang Gao,
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Zhang G, Ma S, Liu X, Yin X, Liu S, Zhou J, Du G. Protein-glutaminase: Research progress and prospect in food manufacturing. FOOD BIOSCI 2021. [DOI: 10.1016/j.fbio.2021.101314] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Yin X, Zhang G, Zhou J, Li J, Du G. Combinatorial engineering for efficient production of protein-glutaminase in Bacillus subtilis. Enzyme Microb Technol 2021; 150:109863. [PMID: 34489022 DOI: 10.1016/j.enzmictec.2021.109863] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 06/21/2021] [Accepted: 06/27/2021] [Indexed: 10/21/2022]
Abstract
Protein-glutaminase (EC 3.5.1.44, PG) converts protein glutamine residues in proteins and peptides into glutamic acid residue, and markedly improves the solubility, emulsification, and foaming properties of food proteins. However, the source bacteria, Chryseobacterium proteolyticum, have low enzyme production ability, inefficient genetic operation, and high production cost. Therefore, it is critical to establish an efficient expression system for active PG. Here, combinatorial engineering was developed for high-yield production of PG in Bacillus subtilis. First, we evaluated different B. subtilis strains for PG self-activation. Then, combinatorial optimization involving promoters, signal peptides, and culture medium was applied to produce active recombinant PG in a B. subtilis expression system. Through combinatorial engineering, PG enzyme activity reached 3.23 U/mL in shaken-flask cultures. Active PG with the yield of 7.07 U/mL was obtained at 40 h by the PSecA-YdeJ combination in fed-batch fermentation, which is the highest yield of PG in existing reports.
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Affiliation(s)
- Xinxin Yin
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Science Center for Future Foods, Jiannan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Guoqiang Zhang
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Science Center for Future Foods, Jiannan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
| | - Jingwen Zhou
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Science Center for Future Foods, Jiannan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Jianghua Li
- School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Science Center for Future Foods, Jiannan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Guocheng Du
- School of Biotechnology and Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Science Center for Future Foods, Jiannan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
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