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Huo Y, Zhang D, Wang X, Xu G, Dai M, Zhang S. Biofunctional attributes and storage study of milk fermented by Enterococcus italicus. Int J Food Microbiol 2024; 423:110844. [PMID: 39068860 DOI: 10.1016/j.ijfoodmicro.2024.110844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 07/17/2024] [Accepted: 07/24/2024] [Indexed: 07/30/2024]
Abstract
Lactic acid bacteria are probiotics in the intestines and have been widely used as natural antioxidants in the food industry. In this study, Enterococcus italicus FM5 with strong antioxidant ability was isolated from fresh milk. The safety evaluation showed that E. italicus FM5 was sensitive to ampicillin, chloramphenicol, erythromycin, vancomycin, rifampicin, and tetracycline, and was not hemolytic. Meanwhile, the whole genome information and biofunctional attributes of this strain were determined and analyzed. Subsequently, E. italicus FM5 was co-cultured with traditional yogurt starters (Streptococcus thermophilus and Lactobacillus bulgaricus) to make fermented milk. The results showed that the addition of E. italicus FM5 could improve the oxygen free radical scavenging ability of the fermented milk, and the scavenging rates of DPPH, ABTS, OH-, and O2- radicals reaching up to 95.54 %, 88.35 %, 93.65 %, and 60.29 %, respectively. Furthermore, the addition of E. italicus FM5 reduced the curd time and improved the water holding capacity of the fermented milk. Besides, the growth of Lb. bulgaricus was significantly promoted when co-cultured with E. italicus FM5, thus the survival cells were increased compared with the traditional fermentation processes. Therefore, this study emphasized the potential to manufacture fermented milk by the co-cultivation of E. italicus with traditional yogurt starters.
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Affiliation(s)
- Yingxin Huo
- College of Life Science, Shandong Normal University, Jinan 250358, China
| | - Daolei Zhang
- Department of Bioengineering, Shandong Polytechnic, Jinan 250104, China
| | - Xiaona Wang
- Shandong Freda Biotech Co., Ltd, Jinan 250101, China
| | - Guangyao Xu
- College of Life Science, Shandong Normal University, Jinan 250358, China
| | - Meixue Dai
- College of Life Science, Shandong Normal University, Jinan 250358, China
| | - Susu Zhang
- College of Life Science, Shandong Normal University, Jinan 250358, China.
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2
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Ma D, Qiu L, Wang X, Li L, Peng S, Liao Y, Li K. L-arabinose isomerase from Lactobacillus fermentum C6: Enzymatic characteristics and its recombinant Bacillus subtilis whole cells achieving a significantly increased production of D-tagatose. Int J Biol Macromol 2024; 278:134753. [PMID: 39147336 DOI: 10.1016/j.ijbiomac.2024.134753] [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: 07/19/2024] [Revised: 08/11/2024] [Accepted: 08/12/2024] [Indexed: 08/17/2024]
Abstract
L-arabinose isomerase (L-AI) is a functional enzyme for the isomerizing of D-galactose to produce D-tagatose. In this study, L-AI-C6-encoding gene from the probiotic Lactobacillus fermentum C6 was cloned and expressed in Bacillus subtilis WB600 for investigating enzymatic characteristics and bioconverting D-tagatose by means of whole-cell catalysis. Results showed that the engineered B. subtilis WB600-pMA5-LAI achieved a maximum specific activity of L-AI-C6 (232.65 ± 15.54 U/mg protein) under cultivation in LB medium at 28 °C for 40 h. The recombinant L-AI-C6 was purified, and enzymatic characteristics test showed its optimum reaction temperature and pH at 60 °C and 8.0, respectively. In addition, L-AI-C6 exhibited good stability within the pH range of 5.5-9.0. By using B. subtilis WB600-pMA5-LAI cells as whole-cell catalyst, the highest D-tagatose yield reached 42.91 ± 0.28 % with D-galactose as substrate, which was 2.41 times that of L. fermentum C6 (17.79 ± 0.11 %). This suggested that the cloning and heterologous expression of L-AI-C6 was an effective strategy for improving D-tagatose conversion by whole-cell catalysis. In brief, the present study demonstrated that the reaction temperature, pH, and stability of L-AI-C6 from L. fermentum C6 meet the demands of industrial application, and the constructed B. subtilis WB600-pMA5-LAI shows promising potential for the whole-cell biotransformation of D-tagatose.
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Affiliation(s)
- Donglin Ma
- College of Food Science and Technology of Guangdong Ocean University, Zhanjiang 524088, China.
| | - Lu Qiu
- Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Jiangxi Agricultural University, Nanchang 330045, China
| | - Xiaofang Wang
- Agriculture Products Processing Research Institute, Chinese Academy of Tropical Agricultural Sciences, Zhanjiang 524001, China
| | - Lilang Li
- College of Food Science and Technology of Guangdong Ocean University, Zhanjiang 524088, China.
| | - Shuaiying Peng
- Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Jiangxi Agricultural University, Nanchang 330045, China.
| | - Yan Liao
- College of Food Science and Technology of Guangdong Ocean University, Zhanjiang 524088, China.
| | - Kuntai Li
- College of Food Science and Technology of Guangdong Ocean University, Zhanjiang 524088, China.
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Temimi WKAAL, Kadhim MA, Khalaf AA. Partial purification of linoleic acid isomerase enzyme from Lactobacillus paracasei bacteria isolated from milk. BRAZ J BIOL 2024; 84:e258276. [DOI: 10.1590/1519-6984.258276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 12/03/2021] [Indexed: 11/22/2022] Open
Abstract
Abstract Conjugated Linoleic Acid (CLA) has attracted the attention of many researchers, especially that of microbial origin due to its biological importance to the consumer. The current study aims to extract LA Isomerase enzyme from Lactobacillus paracasei bacteria from milk and to use the enzyme in the production of CLA. Selective media, including MRS and MRS-Dagatose, were used in isolating local strains. The selected bacterial isolates were tested for their ability to produce LA-Isomerase enzyme. The isolate with high enzymatic activity was selected. After extraction and partial purification of the enzyme, the optimal conditions for the production of conjugated fatty acid were studied, and the reaction products were diagnosed using GC-MS technology. It was found that 11 isolates have the ability to produce CLA at different concentrations, H1 isolate showed the highest production of conjugated fatty acid at a concentration of 120.45 g.ml-1, this isolate was selected as the source for enzyme extraction. The enzymatic activity of the crude extract and partially purified with ammonium sulfate was estimated using color methods at wavelength of 233 nm. The effect of the optimum conditions (pH, temperature, linoleic acid concentration and enzyme concentration) on the CLA product was studied using the partially purified LA Isomerase enzyme, the optimum conditions for production were 6.5, 45 °C, 100 μg.ml-1 and 0.7 ml, respectively. The GC-MS technique showed the presence of a number of reaction products that are isomers of conjugated linoleic acid (C9T11, T9T12, T10C12) with different concentrations.
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Nirwantono R, Laksmi FA, Nuryana I, Firdausa S, Herawan D, Giyandini R, Hidayat AA. Exploring an l-arabinose isomerase from cryophile bacteria Arthrobacter psychrolactophilus B7 for d-tagatose production. Int J Biol Macromol 2024; 254:127781. [PMID: 37923040 DOI: 10.1016/j.ijbiomac.2023.127781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 10/21/2023] [Accepted: 10/28/2023] [Indexed: 11/07/2023]
Abstract
A novel l-arabinose isomerase (L-AI) from Arthrobacter psychrolactophilus (Ap L-AI) was successfully cloned and characterized. The enzyme catalyzes the isomerization of d-galactose into a rare sugar d-tagatose. The recombinant Ap L-AI had an approximate molecular weight of about 258 kDa, suggesting it was an aggregate of five 58 kDa monomers and became the first record as a homo-pentamer L-AI. The catalytic efficiency (kcat/Km) and Km for d-galactose were 0.32 mM-1 min-1 and 51.43 mM, respectively, while for l-arabinose, were 0.64 mM-1 min-1 and 23.41 mM, respectively. It had the highest activity at pH 7.0-7.5 and 60 °C in the presence of 0.250 mM Mn2+. Ap L-AI was discovered to be an outstanding thermostable enzyme that only lost its half-life value at 60 °C for >1000 min. These findings suggest that l-arabinose isomerase from Arthrobacter psychrolactophilus is a promising candidate for d-tagatose mass-production due to its industrially competitive temperature.
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Affiliation(s)
- Rudi Nirwantono
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia; School of Chemistry and Molecular Bioscience, University of Queensland, Chemistry Bld, 68 Cooper Rd, Brisbane, QLD 4072, Australia; Department of Biotechnology, Faculty of Food Technology, Bina Nusantara University, Anggrek Jl. Kebon Jeruk Raya No. 27, Kebon Jeruk, West Jakarta 11530, Indonesia
| | - Fina Amreta Laksmi
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia.
| | - Isa Nuryana
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia
| | - Salsabila Firdausa
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia
| | - David Herawan
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia
| | - Ranistia Giyandini
- Research Center for Applied Microbiology, National Research and Innovation Agency (BRIN), Jl. Raya Bogor, Km. 46, Cibinong, Bogor 16911, Indonesia
| | - Alam Ahmad Hidayat
- Mathematics Department, School of Computer Science, Bina Nusantara University, Anggrek Jl. Kebon Jeruk Raya No. 27, Kebon Jeruk, West Jakarta 11530, Indonesia
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Ma W, Li F, Li L, Li B, Niu K, Liu Q, Han L, Han L, Fang X. Production of D -tagatose, bioethanol, and microbial protein from the dairy industry by-product whey powder using an integrated bioprocess. Biotechnol J 2024; 19:e2300415. [PMID: 38375553 DOI: 10.1002/biot.202300415] [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: 08/16/2023] [Revised: 12/08/2023] [Accepted: 12/19/2023] [Indexed: 02/21/2024]
Abstract
We designed and constructed a green and sustainable bioprocess to efficiently coproduce D -tagatose, bioethanol, and microbial protein from whey powder. First, a one-pot biosynthesis process involving lactose hydrolysis and D -galactose redox reactions for D -tagatose production was established in vitro via a three-enzyme cascade. Second, a nicotinamide adenine dinucleotide phosphate-dependent galactitol dehydrogenase mutant, D36A/I37R, based on the nicotinamide adenine dinucleotide-dependent polyol dehydrogenase from Paracoccus denitrificans was created through rational design and screening. Moreover, an NADPH recycling module was created in the oxidoreductive pathway, and the tagatose yield increased by 3.35-fold compared with that achieved through the pathway without the cofactor cycle. The reaction process was accelerated using an enzyme assembly with a glycine-serine linker, and the tagatose production rate was 9.28-fold higher than the initial yield. Finally, Saccharomyces cerevisiae was introduced into the reaction solution, and 266.5 g of D -tagatose, 162.6 g of bioethanol, and 215.4 g of dry yeast (including 38% protein) were obtained from 1 kg of whey powder (including 810 g lactose). This study provides a promising sustainable process for functional food (D -tagatose) production. Moreover, this process fully utilized whey powder, demonstrating good atom economy.
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Affiliation(s)
- Wei Ma
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Fengyi Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Longyue Li
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Bin Li
- Shandong Henglu Biotechnology Co., Ltd., Jinan, Shandong, China
| | - Kangle Niu
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Qinghua Liu
- Shandong Henglu Biotechnology Co., Ltd., Jinan, Shandong, China
| | - Laichuang Han
- School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Lijuan Han
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
| | - Xu Fang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao, Shandong, China
- Rongcheng Huihai Chuangda Biotechnology Co., Ltd., Weihai, Shandong, China
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Diankristanti PA, Ng IS. Microbial itaconic acid bioproduction towards sustainable development: Insights, challenges, and prospects. BIORESOURCE TECHNOLOGY 2023:129280. [PMID: 37290713 DOI: 10.1016/j.biortech.2023.129280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/10/2023]
Abstract
Microbial biomanufacturing is a promising approach to produce high-value compounds with low-carbon footprint and significant economic benefits. Among twelve "Top Value-Added Chemicals from Biomass", itaconic acid (IA) stands out as a versatile platform chemical with numerous applications. IA is naturally produced by Aspergillus and Ustilago species through a cascade enzymatic reaction between aconitase (EC 4.2.1.3) and cis-aconitic acid decarboxylase (EC 4.1.1.6). Recently, non-native hosts such as Escherichia coli, Corynebacterium glutamicum, Saccharomyces cerevisiae, and Yarrowia lipolytica have been genetically engineered to produce IA through the introduction of key enzymes. This review provides an up-to-date summary of the progress made in IA bioproduction, from native to engineered hosts, covers in vivo and in vitro approaches, and highlights the prospects of combination tactics. Current challenges and recent endeavors are also addressed to envision comprehensive strategies for renewable IA production in the future towards sustainable development goals (SDGs).
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Affiliation(s)
| | - I-Son Ng
- Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
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7
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Zhang A, Hou Y, Wang Y, Wang Q, Shan X, Liu J. Highly efficient low-temperature biodegradation of polyethylene microplastics by using cold-active laccase cell-surface display system. BIORESOURCE TECHNOLOGY 2023; 382:129164. [PMID: 37207695 DOI: 10.1016/j.biortech.2023.129164] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/06/2023] [Accepted: 05/09/2023] [Indexed: 05/21/2023]
Abstract
To eliminate efficiency restriction of polyethylene microplastics low-temperature biodegradation, a novel InaKN-mediated Escherichia coli surface display platform for cold-active degrading laccase PsLAC production was developed. Display efficiency of 88.0% for engineering bacteria BL21/pET-InaKN-PsLAC was verified via subcellular extraction and protease accessibility, exhibiting an activity load of 29.6 U/mg. Cell growth and membrane integrity revealed BL21/pET-InaKN-PsLAC maintained stable growth and intact membrane structure during the display process. The favorable applicability was confirmed, with 50.0% activity remaining in 4 days at 15 °C, and 39.0% activity recovery retention after 15 batches of activity substrate oxidation reactions. Moreover, BL21/pET-InaKN-PsLAC possessed high polyethylene low-temperature depolymerizing capacity. Bioremediation experiments proved that the degradation rate was 48.0% within 48 h at 15 °C, and reached 66.0% after 144 h. Collectively, cold-active PsLAC functional surface display technology and its significant contributions to polyethylene microplastics low-temperature degradation constitute an effective improvement strategy for biomanufacturing and microplastics cold remediation.
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Affiliation(s)
- Ailin Zhang
- School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Yanhua Hou
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Yatong Wang
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China.
| | - Quanfu Wang
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China.
| | - Xuejing Shan
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
| | - Jianan Liu
- School of Marine Science and Technology, Harbin Institute of Technology, Weihai 264209, China
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Han Z, Li N, Xu H, Xu Z. Improved thermostability and robustness of L-arabinose isomerase by C-terminal elongation and its application in rare sugar production. Biochem Biophys Res Commun 2022; 637:224-231. [DOI: 10.1016/j.bbrc.2022.11.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/04/2022] [Accepted: 11/09/2022] [Indexed: 11/16/2022]
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Xu Y, Wu Y, Liu Y, Li J, Du G, Chen J, Lv X, Liu L. Sustainable bioproduction of natural sugar substitutes: Strategies and challenges. Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Huang J, Wang B, Tao S, Hu Y, Wang N, Zhang Q, Wang C, Chen C, Gao B, Cheng X, Li Y. D-tagatose protects against oleic acid-induced acute respiratory distress syndrome in rats by activating PTEN/PI3K/AKT pathway. Front Immunol 2022; 13:928312. [PMID: 36189316 PMCID: PMC9520915 DOI: 10.3389/fimmu.2022.928312] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 08/29/2022] [Indexed: 12/02/2022] Open
Abstract
Acute respiratory distress syndrome (ARDS) is characterized by disruption of the alveolar–capillary barrier, resulting in severe alveolar edema and inflammation. D-tagatose (TAG) is a low-calorie fructose isomer with diverse biological activities whose role in ARDS has never been explored. We found that TAG protects lung tissues from injury in the oleic acid-induced rat model of ARDS. Seventeen male Sprague–Dawley rats were randomly assigned to 3 groups: Sham (n = 5), ARDS (n = 6), and TAG + ARDS (n = 6). The treatment groups were injected with oleic acid to induce ARDS, and the TAG + ARDS group was given TAG 3 days before the induction. After the treatments, the effect of TAG was evaluated by blood gas analysis and observing the gross and histological structure of the lung. The results showed that TAG significantly improved the oxygenation function, reduced the respiratory acidosis and the inflammatory response. TAG also improved the vascular permeability in ARDS rats and promoted the differentiation of alveolar type II cells, maintaining the stability of the alveolar structure. This protective effect of TAG on the lung may be achieved by activating the PTEN/PI3K/AKT pathway. Thus, TAG protects against oleic acid-induced ARDS in rats, suggesting a new clinical strategy for treating the condition.
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Affiliation(s)
- Jian Huang
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
| | - Bingjie Wang
- Department of Anesthesiology, The Forth Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Shaoyi Tao
- Department of Plastic Repair Burn Surgery Dermatology, The Second People’s Hospital of Hefei, Hefei Hospital Affiliated to Anhui Medical University, Hefei, China
| | - Yuexia Hu
- Department of Anesthesiology, The Forth Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Ning Wang
- Department of Anesthesiology, The Forth Affiliated Hospital of Anhui Medical University, Hefei, China
- Key Laboratory of Anesthesiology and Perioperative Medicine of Anhui Higher Education Institutes, Anhui Medical University, Hefei, China
| | - Qiaoyun Zhang
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
| | - Chunhui Wang
- Department of Anesthesiology, The Forth Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Chen Chen
- Department of Anesthesiology, The Forth Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Bingren Gao
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
- *Correspondence: Yongnan Li, ; Xingdong Cheng, ; Bingren Gao,
| | - Xingdong Cheng
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
- *Correspondence: Yongnan Li, ; Xingdong Cheng, ; Bingren Gao,
| | - Yongnan Li
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou University, Lanzhou, China
- *Correspondence: Yongnan Li, ; Xingdong Cheng, ; Bingren Gao,
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Effects of Spore-Displayed p75 Protein from Lacticaseibacillus rhamnosus GG on the Transcriptional Response of HT-29 Cells. Microorganisms 2022; 10:microorganisms10071276. [PMID: 35888995 PMCID: PMC9323162 DOI: 10.3390/microorganisms10071276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 06/20/2022] [Accepted: 06/22/2022] [Indexed: 12/10/2022] Open
Abstract
A Lacticaseibacillus rhamnosus GG-derived protein, p75, is one of the key molecules exhibiting probiotic activity. However, the molecular mechanism and transcriptional response of p75 in human intestinal epithelial cells are not completely understood. To gain a deeper understanding of its potential probiotic action, this study investigated genome-wide responses of HT-29 cells to stimulation by spore-displayed p75 (CotG-p75) through a transcriptome analysis based on RNA sequencing. Analysis of RNA-seq data showed significant changes of gene expression in HT-29 cells stimulated by CotG-p75 compared to the control. A total of 189 up-regulated and 314 down-regulated genes was found as differentially expressed genes. Gene ontology enrichment analysis revealed that a large number of activated genes was involved in biological processes, such as epithelial cell differentiation, development, and regulation of cell proliferation. A gene–gene interaction network analysis showed that several DEGs, including AREG, EREG, HBEGF, EPGN, FASLG, GLI2, CDKN1A, FOSL1, MYC, SERPINE1, TNFSF10, BCL6, FLG, IVL, SPRR1A, SPRR1B, SPRR3, and MUC5AC, might play a critical role in these biological processes. RNA-seq results for selected genes were verified by reverse transcription-quantitative polymerase chain reaction. Overall, these results provide extensive knowledge about the transcriptional responses of HT-29 cells to stimulation by CotG-p75. This study showed that CotG-p75 can contribute to cell survival and epithelial development in human intestinal epithelial cells.
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Zhang S, Xu Z, Ma M, Zhao G, Chang R, Si H, Dai M. A novel Lactococcus lactis l-arabinose isomerase for d-tagatose production from lactose. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Zhang X, Lu R, Wang Q, Hu M, Li Z, Xu M, Yang T, Zhang R, Rao Z. Production of d-Tagatose by Whole-Cell Conversion of Recombinant Bacillus subtilis in the Absence of Antibiotics. BIOLOGY 2021; 10:biology10121343. [PMID: 34943259 PMCID: PMC8698901 DOI: 10.3390/biology10121343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/08/2021] [Accepted: 12/14/2021] [Indexed: 12/12/2022]
Abstract
Simple Summary d-tagatose is a valuable monosaccharide in the food industry produced from lactose by β-galactosidase and arabinose isomerase. To improve its production safety, d-alanine-deficient heterologous gene expression systems were constructed without antibiotics. The integrated expression and co-expression plasmids were used in different systems, also exploiting the need for d-alanine during cellular metabolism. The integration of the β-galactosidase gene in recombinant is uniquely innovative and promising, applying common knockout techniques to the expression of target genes and the production of high-value products. Abstract d-tagatose is a popular functional monosaccharide produced from lactose by β-galactosidase and arabinose isomerase. In this study, two d-alanine-deficient heterologous gene expression systems were constructed, B. subtilis 168 D1 and B. subtilis 168 D2, using overlapping extension PCR and the CRE/loxP system. The lacZ gene for β-galactosidase was integrated into a specific locus of the chassis B. subtilis 168 D2. A mutually complementary plasmid pMA5 with the alanine racemase gene alrA attached to it was constructed and used to assemble recombinant plasmids overexpressing β-galactosidase and arabinose isomerase. Afterward, an integrated recombinant was constructed by the plasmid expressing the arabinose isomerase gene araA of E. coli transform-competent B. subtilis 168 D2 cells. The co-expressing plasmids were introduced into alanine racemase knockout B. subtilis 168 D1. Whole-cell bioconversion was performed using the integrated recombinant with a maximum yield of 96.8 g/L d-tagatose from 500 g/L lactose, and the highest molar conversions were 57.2%. B. subtilis 168 D1/pMA5-alrA-araA-lacZ is capable of single-cell one-step production of d-tagatose. This study provides a new approach to the production of functional sugars.
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Baptista SL, Romaní A, Oliveira C, Ferreira S, Rocha CM, Domingues L. Galactose to tagatose isomerization by the l-arabinose isomerase from Bacillus subtilis: A biorefinery approach for Gelidium sesquipedale valorisation. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2021.112199] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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15
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Chen Q, Xu W, Wu H, Guang C, Zhang W, Mu W. An overview of D-galactose utilization through microbial fermentation and enzyme-catalyzed conversion. Appl Microbiol Biotechnol 2021; 105:7161-7170. [PMID: 34515844 DOI: 10.1007/s00253-021-11568-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 01/05/2023]
Abstract
D-Galactose is an abundant carbohydrate monomer in nature and widely exists in macroalgae, plants, and dairy wastes. D-Galactose is useful as a raw material for biomass fuel production or low-calorie sweetener production, attracting increased attention. This article summarizes the studies on biotechnological processes for galactose utilization. Two main research directions of microbial fermentation and enzyme-catalyzed conversion from galactose-rich biomass are extensively reviewed. The review provides the recent discoveries for biofuel production from macroalgae, including the innovative methods in the pretreatment process and technological development in the fermentation process. As modern people pay more attention to health, enzyme technologies for low-calorie sweetener production are more urgently needed. D-Tagatose is a promising low-calorie alternative to sugar. We discuss the recent studies on characterization and genetic modification of L-arabinose isomerase to improve the bioconversion of D-galactose to D-tagatose. In addition, the trends and critical challenges in both research directions are outlined at the end. KEY POINTS: • The value and significance of galactose utilization are highlighted. • Biofuel production from galactose-rich biomass is accomplished by fermentation. • L-arabinose isomerase is a tool for bioconversion of D-galactose to D-tagatose.
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Affiliation(s)
- Qiuming Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China
| | - Wei Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China
| | - Hao Wu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China
| | - Cuie Guang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China.
| | - Wenli Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China.
| | - Wanmeng Mu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi , 214122, Jiangsu, China.,International Joint Laboratory On Food Safety, Jiangnan University, Wuxi, 214122, China
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Mohsin MZ, Omer R, Huang J, Mohsin A, Guo M, Qian J, Zhuang Y. Advances in engineered Bacillus subtilis biofilms and spores, and their applications in bioremediation, biocatalysis, and biomaterials. Synth Syst Biotechnol 2021; 6:180-191. [PMID: 34401544 PMCID: PMC8332661 DOI: 10.1016/j.synbio.2021.07.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 06/24/2021] [Accepted: 07/23/2021] [Indexed: 01/23/2023] Open
Abstract
Bacillus subtilis is a commonly used commercial specie with broad applications in the fields of bioengineering and biotechnology. B. subtilis is capable of producing both biofilms and spores. Biofilms are matrix-encased multicellular communities that comprise various components including exopolysaccharides, proteins, extracellular DNA, and poly-γ-glutamic acid. These biofilms resist environmental conditions such as oxidative stress and hence have applications in bioremediation technologies. Furthermore, biofilms and spores can be engineered through biotechnological techniques for environmentally-friendly and safe production of bio-products such as enzymes. The ability to withstand with harsh conditions and producing spores makes Bacillus a suitable candidate for surface display technology. In recent years, the spores of such specie are widely used as it is generally regarded as safe to use. Advances in synthetic biology have enabled the reprogramming of biofilms to improve their functions and enhance the production of value-added products. Globally, there is increased interest in the production of engineered biosensors, biocatalysts, and biomaterials. The elastic modulus and gel properties of B. subtilis biofilms have been utilized to develop living materials. This review outlines the formation of B. subtilis biofilms and spores. Biotechnological engineering processes and their increasing application in bioremediation and biocatalysis, as well as the future directions of B. subtilis biofilm engineering, are discussed. Furthermore, the ability of B. subtilis biofilms and spores to fabricate functional living materials with self-regenerating, self-regulating and environmentally responsive characteristics has been summarized. This review aims to resume advances in biological engineering of B. subtilis biofilms and spores and their applications.
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Key Words
- Bacillus subtilis
- Biocatalysis
- Biofilms
- Biomaterials
- Bioremediation
- Extracellular DNA, (eDNA)
- Extracellular Polymeric Substance/ Exopolysaccharide, (EPS)
- Gold nanoparticles, (AuNPs)
- Green fluorescent protein, (GFP)
- Isopropylthio-β-d-galactoside, (IPTG)
- Menaquinoe-7, (MK-7)
- Microbial fuel cell, (MFC)
- Mono (2-hydroxyethyl) terephthalic acid, (MHET)
- N-Acetyl-d-neuraminic Acid, (Neu5Ac)
- N-acetylglucosamine, (GlcNAc)
- Nanoparticles, (NPs)
- Nickel nitriloacetic acid, (Ni-NTA)
- Organophosphorus hydrolase, (OPH)
- Paranitrophenol, (PNP)
- Paraoxon, (PAR)
- Quantum dots, (QDs)
- Spores
- Synthetic biology
- d-psicose 3-epimerase, (DPEase)
- l-Arabinose Isomerase, (L-AI)
- p-aminophenol, (PAP)
- β-Galactosidase, (β-Gal)
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Affiliation(s)
- Muhammad Zubair Mohsin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Rabia Omer
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Jiaofang Huang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Ali Mohsin
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Meijin Guo
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Jiangchao Qian
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Yingping Zhuang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, PR China
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Suresh A, Shravan Ramgopal D, Panchamoorthy Gopinath K, Arun J, SundarRajan P, Bhatnagar A. Recent advancements in the synthesis of novel thermostable biocatalysts and their applications in commercially important chemoenzymatic conversion processes. BIORESOURCE TECHNOLOGY 2021; 323:124558. [PMID: 33383359 DOI: 10.1016/j.biortech.2020.124558] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/11/2020] [Accepted: 12/12/2020] [Indexed: 06/12/2023]
Abstract
Thermostable enzymes are a field of growing interest in bioremediation, pharmaceuticals, food industry etc., due to their ability to catalyze bio reactions at high temperatures. This review aims to provide an overview on extremophiles with a special focus on thermophiles and enzymes produced from extremophilic bacteria. Novel thermostable catalysts, used in producing commercially important chemicals, are discussed in this review. Various classes of enzymes produced by microbes, synthesis of thermozymes and comparison with enzymes produced at optimal conditions are critically discussed. A detailed discussion on immobilized enzymes in comparisons with free enzymes, produced by extremozymes, is included. Different parameters which affect enzyme production are also discussed. The current industrial trends along with the future of biocatalysts in the production of chemicals using efficient methods are also discussed.
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Affiliation(s)
- Aravind Suresh
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam - 603110, Chennai, Tamil Nadu, India
| | - Dhakshin Shravan Ramgopal
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam - 603110, Chennai, Tamil Nadu, India
| | - Kannappan Panchamoorthy Gopinath
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam - 603110, Chennai, Tamil Nadu, India
| | - Jayaseelan Arun
- Centre for Waste Management, International Research Centre, Sathyabama Institute of Science and Technology, Jeppiaar Nagar (OMR), Chennai 600119, Tamil Nadu, India
| | - Panneerselvam SundarRajan
- Department of Chemical Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam - 603110, Chennai, Tamil Nadu, India
| | - Amit Bhatnagar
- Department of Separation Science, LUT School of Engineering Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, Finland.
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Su WB, Li FL, Li XY, Fan XM, Liu RJ, Zhang YW. Using galactitol dehydrogenase coupled with water-forming NADH oxidase for efficient enzymatic synthesis of L-tagatose. N Biotechnol 2021; 62:18-25. [PMID: 33460816 DOI: 10.1016/j.nbt.2021.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 01/05/2021] [Accepted: 01/11/2021] [Indexed: 10/22/2022]
Abstract
L-Tagatose, a promising building block in the production of many value-added chemicals, is generally produced by chemical routes with a low yield, which may not meet the increasing demands. Synthesis of l-tagatose by enzymatic oxidation of d-galactitol has not been applied on an industrial scale because of the high cofactor costs and the lack of efficient cofactor regeneration methods. In this work, an efficient and environmentally friendly enzymatic method containing a galactitol dehydrogenase for d-galactitol oxidation and a water-forming NADH oxidase for regeneration of NAD+ was first designed and used for l-tagatose production. Supplied with only 3 mM NAD+, subsequent reaction optimization facilitated the efficient transformation of 100 mM of d-galactitol into l-tagatose with a yield of 90.2 % after 12 h (obtained productivity: 7.61 mM.h-1). Compared with the current chemical and biocatalytic methods, the strategy developed avoids by-product formation and achieves the highest yield of l-tagatose with low costs. It is expected to become a cleaner and more promising route for industrial biosynthesis of l-tagatose.
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Affiliation(s)
- Wen-Bin Su
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Fei-Long Li
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Xue-Yong Li
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Xiao-Man Fan
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Rui-Jiang Liu
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China
| | - Ye-Wang Zhang
- School of Pharmacy, Jiangsu University, Zhenjiang, 212013, People's Republic of China; College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou, 535011, People's Republic of China.
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Ravikumar Y, Ponpandian LN, Zhang G, Yun J, Qi X. Harnessing -arabinose isomerase for biological production of -tagatose: Recent advances and its applications. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2020.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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20
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Sun Z, Miao T, Yin A, Qiu H, Xiao Y, Li Y, Hai J, Xu B. Optimization of fermentation conditions for production of l-arabinose isomerase of Lactobacillus plantarum WU14. Food Sci Nutr 2021; 9:230-243. [PMID: 33473287 PMCID: PMC7802578 DOI: 10.1002/fsn3.1989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/22/2020] [Accepted: 10/14/2020] [Indexed: 12/02/2022] Open
Abstract
As a substitute sweetener for sucrose, d-tagatose is widely used in products, such as health drinks, yogurt, fruit juices, baked goods, confectionery, and pharmaceutical preparations. In the fermentation process of l-AI produced by Lactobacillus plantarum, d-tagatose is produced through biotransformation and this study was based on the fermentation process of Lactobacillus plantarum WU14 producing l-AI to further research the biotransformation and separation process of d-tagatose. The kinetics of cell growth, substrate consumption, and l-arabinose isomerase formation were established by nonlinear fitting, and the fitting degrees were 0.996, 0.994, and 0.991, respectively, which could better reflect the change rule of d-tagatose biotransformation in the fermentation process of L. plantarum WU14. The separation process of d-tagatose was identified by decolorization, protein removal, desalination, and freeze drying, initially. Finally, the volume ratio of whole cell catalysts, d-galactose, and borate was 5:1:2 at 60°C, pH 7.17 through borate complexation; then, after 24 hr of conversion, the yield of d-tagatose was 58 g/L.
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Affiliation(s)
- Zhijun Sun
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Tingting Miao
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Aiguo Yin
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Hulin Qiu
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Yunyi Xiao
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Ying Li
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Jinping Hai
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
| | - Bo Xu
- College of Biological and Food EngineeringGuangdong University of Petrochemical TechnologyMaomingChina
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21
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Jooybari NM, Amini K, Falsafi S. Determining the L-arabinose isomerase in bacilli isolates from Gandom Beryan area of Kerman (Iran) by Molecular method and its cloning in Escherichia coli xl1 blue. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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Shin KC, Lee TE, Seo MJ, Kim DW, Kang LW, Oh DK. Development of Tagaturonate 3-Epimerase into Tagatose 4-Epimerase with a Biocatalytic Route from Fructose to Tagatose. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kyung-Chul Shin
- Research Institute of Bioactive-Metabolome Network, Konkuk University, Seoul 05029, Republic of Korea
| | - Tae-Eui Lee
- Department of Bioscience and Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Min-Ju Seo
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, St. Paul, Minneapolis, Minnesota 55108, United States
| | - Dae Wook Kim
- Forest Plant Industry Department, Baekdudaegan National Arboretum, Bonghwa 36209, Republic of Korea
| | - Lin-Woo Kang
- Department of Biological Sciences, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Deok-Kun Oh
- Department of Bioscience and Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
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23
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Kang SJ, Jun JS, Moon JA, Hong KW. Surface display of p75, a Lactobacillus rhamnosus GG derived protein, on Bacillus subtilis spores and its antibacterial activity against Listeria monocytogenes. AMB Express 2020; 10:139. [PMID: 32770428 PMCID: PMC7415045 DOI: 10.1186/s13568-020-01073-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 07/25/2020] [Indexed: 01/05/2023] Open
Abstract
Lactobacillus rhamnosus p75 protein with peptidoglycan hydrolase (PGH) activity is one of the key molecules exhibiting anti-apoptotic and cell-protective activity for human intestinal epithelial cells. In this study, with the goal of developing new probiotics, the p75 protein was displayed on the surface of Bacillus subtilis spores using spore coat protein CotG as an anchoring motif. The PGH activity, stability, and the antibacterial activity of the spore-displayed p75 (CotG-p75) protein were also investigated. The PGH activity of the CotG-p75 against peptidoglycan extracted from B. subtilis was confirmed by the ninhydrin test. Under various harsh conditions, compared to the control groups, the PGH activities of CotG-p75 were very stable in the range of pH 3–7 and maintained at 70% at 50 °C. In addition, the antibacterial activity of CotG-p75 against Listeria monocytogenes was evaluated by a time-kill assay. After 6 h incubation in phosphate-buffered saline, CotG-p75 reduced the number of viable cells of L. monocytogenes by up to 2.0 log. Scanning electron microscopy analysis showed that the cell wall of L. monocytogenes was partially damaged by the treatment with CotG-p75. Our preliminary results show that CotG-p75 could be a good candidate for further research to develop new genetically engineered probiotics.
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Bortone N, Fidaleo M. Stabilization of immobilizedl‐arabinose isomerase for the production ofd‐tagatose fromd‐galactose. Biotechnol Prog 2020; 36:e3033. [DOI: 10.1002/btpr.3033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/21/2020] [Accepted: 06/02/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Nadia Bortone
- Department for Innovation in Biological, Agro‐food and Forest Systems University of Tuscia Viterbo Italy
| | - Marcello Fidaleo
- Department for Innovation in Biological, Agro‐food and Forest Systems University of Tuscia Viterbo Italy
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25
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A Three-Step Process for the Bioconversion of Whey Permeate into a Glucose-Free D-Tagatose Syrup. Catalysts 2020. [DOI: 10.3390/catal10060647] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We have developed a sustainable three-stage process for the revaluation of cheese whey permeate into D-tagatose, a rare sugar with functional properties used as sweetener. The experimental conditions (pH, temperature, cofactors, etc.) for each step were independently optimized. In the first step, concentrated whey containing 180–200 g/L of lactose was fully hydrolyzed by β-galactosidase from Bifidobacterium bifidum (Saphera®) in 3 h at 45 °C. Secondly, glucose was selectively removed by treatment with Pichia pastoris cells for 3 h at 30 °C. The best results were obtained with 350 mg of cells (previously grown for 16 h) per mL of solution. Finally, L-arabinose isomerase US100 from Bacillus stearothermophilus was employed to isomerize D-galactose into D-tagatose at pH 7.5 and 65 °C, in presence of 0.5 mM MnSO4. After 7 h, the concentration of D-tagatose was approximately 30 g/L (33.3% yield, referred to the initial D-galactose present in whey). The proposed integrated process takes place under mild conditions (neutral pH, moderate temperatures) in a short time (13 h), yielding a glucose-free syrup containing D-tagatose and galactose in a ratio 1:2 (w/w).
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Zhang G, Zabed HM, Yun J, Yuan J, Zhang Y, Wang Y, Qi X. Two-stage biosynthesis of D-tagatose from milk whey powder by an engineered Escherichia coli strain expressing L-arabinose isomerase from Lactobacillus plantarum. BIORESOURCE TECHNOLOGY 2020; 305:123010. [PMID: 32105844 DOI: 10.1016/j.biortech.2020.123010] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 02/04/2020] [Accepted: 02/08/2020] [Indexed: 06/10/2023]
Abstract
In this study, a new strain of Lactobacillus plantarum (CY.6) was identified and its L-arabinose isomerase (L-AI) encoding gene (araA) was overexpressed in Escherichia coli BL21 for the biosynthesis of D-tagatose from milk whey powders (WP). Whole-cell biotransformation of lactose in WP into D-tagatose was done by three technological approaches, including 100%, 50% and 0% hydrolysis of lactose in WP before biotransformation, where simultaneous saccharification and biotransformation (SSB, 0% prior hydrolysis of lactose) produced maximum amounts of D-tagatose. Two-stage SSB provided 73.6% conversion efficiency (based on D-galactose) and 36.8% (in term of lactose), with 51.5 g/L of D-tagatose after 96 h, while concentration of D-tagatose produced after first stage was 34.4 g/L. Yield and volumetric productivity of D-tagatose after two-stage SSB were found to be 0.26 g/g of WP (0.37 g/g of lactose, 0.74 g/g of D-galactose produced from lactose) and 0.54 g/L/h, respectively.
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Affiliation(s)
- Guoyan Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Hossain M Zabed
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Junhua Yun
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Jiao Yuan
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Yufei Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Yang Wang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Xianghui Qi
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China.
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Ding J, Zhou Y, Wang C, Peng Z, Mu Y, Tang X, Huang Z. Development of a whole-cell biocatalyst for diisobutyl phthalate degradation by functional display of a carboxylesterase on the surface of Escherichia coli. Microb Cell Fact 2020; 19:114. [PMID: 32471417 PMCID: PMC7260753 DOI: 10.1186/s12934-020-01373-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Accepted: 05/25/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Phthalic acid esters (PAEs) are widely used as plasticizers or additives during the industrial manufacturing of plastic products. PAEs have been detected in both aquatic and terrestrial environments due to their overuse. Exposure of PAEs results in human health concerns and environmental pollution. Diisobutyl phthalate is one of the main plasticizers in PAEs. Cell surface display of recombinant proteins has become a powerful tool for biotechnology applications. In this current study, a carboxylesterase was displayed on the surface of Escherichia coli cells, for use as whole-cell biocatalyst in diisobutyl phthalate biodegradation. RESULTS A carboxylesterase-encoding gene (carEW) identified from Bacillus sp. K91, was fused to the N-terminal of ice nucleation protein (inpn) anchor from Pseudomonas syringae and gfp gene, and the fused protein was then cloned into pET-28a(+) vector and was expressed in Escherichia coli BL21(DE3) cells. The surface localization of INPN-CarEW/or INPN-CarEW-GFP fusion protein was confirmed by SDS-PAGE, western blot, proteinase accessibility assay, and green fluorescence measurement. The catalytic activity of the constructed E. coli surface-displayed cells was determined. The cell-surface-displayed CarEW displayed optimal temperature of 45 °C and optimal pH of 9.0, using p-NPC2 as substrate. In addition, the whole cell biocatalyst retained ~ 100% and ~ 200% of its original activity per OD600 over a period of 23 days at 45 °C and one month at 4 °C, exhibiting the better stability than free CarEW. Furthermore, approximately 1.5 mg/ml of DiBP was degraded by 10 U of surface-displayed CarEW cells in 120 min. CONCLUSIONS This work provides a promising strategy of cost-efficient biodegradation of diisobutyl phthalate for environmental bioremediation by displaying CarEW on the surface of E. coli cells. This approach might also provide a reference in treatment of other different kinds of environmental pollutants by displaying the enzyme of interest on the cell surface of a harmless microorganism.
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Affiliation(s)
- Junmei Ding
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China.
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China.
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China.
| | - Yang Zhou
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China
| | - Chaofan Wang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China
| | - Zheng Peng
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China
| | - Yuelin Mu
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China
| | - Xianghua Tang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China
| | - Zunxi Huang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University, Kunming, 650500, Yunnan, China.
- Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, 650500, Yunnan, China.
- Key Laboratory of Enzyme Engineering, Yunnan Normal University, Kunming, 650500, Yunnan, China.
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Zhang G, An Y, Parvez A, Zabed HM, Yun J, Qi X. Exploring a Highly D-Galactose Specific L-Arabinose Isomerase From Bifidobacterium adolescentis for D-Tagatose Production. Front Bioeng Biotechnol 2020; 8:377. [PMID: 32411693 PMCID: PMC7201074 DOI: 10.3389/fbioe.2020.00377] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Accepted: 04/06/2020] [Indexed: 12/14/2022] Open
Abstract
D-Galactose-specific L-arabinose isomerase (L-AI) would have much potential for the enzymatic conversion of D-Galactose into D-tagatose, while most of the reported L-AIs are L-arabinose specific. This study explored a highly D-Galactose-specific L-AI from Bifidobacterium adolescentis (BAAI) for the production of D-tagatose. In the comparative protein-substrate docking for D-Galactose and L-arabinose, BAAI showed higher numbers of hydrogen bonds in D-Galactose-BAAI bonding site than those found in L-arabinose-BAAI bonding site. The activity of BAAI was 24.47 U/mg, and it showed good stability at temperatures up to 65°C and a pH range 6.0–7.5. The Km, Vmax, and Kcat/Km of BAAI were found to be 22.4 mM, 489 U/mg and 9.3 mM–1 min–1, respectively for D-Galactose, while the respective values for L-arabinose were 40.2 mM, 275.1 U/mg, and 8.6 mM–1 min–1. Enzymatic conversion of D-Galactose into D-tagatose by BAAI showed 56.7% conversion efficiency at 55°C and pH 6.5 after 10 h.
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Affiliation(s)
- Guoyan Zhang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Yingfeng An
- College of Biosciences and Biotechnology, Shenyang Agricultural University, Shenyang, China
| | - Amreesh Parvez
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Hossain M Zabed
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Junhua Yun
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Xianghui Qi
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
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Jeong DW, Hyeon JE, Shin SK, Han SO. Trienzymatic Complex System for Isomerization of Agar-Derived d-Galactose into d-Tagatose as a Low-Calorie Sweetener. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:3195-3202. [PMID: 32075368 DOI: 10.1021/acs.jafc.9b07536] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
d-Tagatose is a rare monosaccharide that is used in products in the food industry as a low-calorie sweetener. To facilitate biological conversion of d-tagatose, the agarolytic enzyme complexes based on the principle of the cellulosome structure were constructed through dockerin-cohesin interaction with the scaffoldin. The construction of agarolytic complexes composed of l-arabinose isomerase caused efficient isomerization activity on the agar-derived sugars. In a trienzymatic complex, the chimeric β-agarase (cAgaB) and anhydro-galactosidase (cAhgA) from Zobellia galactanivorans could synergistically hydrolyze natural agar substrates and l-arabinose isomerase (LsAraA Doc) from Lactobacillus sakei 23K could convert d-galactose into d-tagatose. The trienzymatic complex increased the concentration of d-tagatose from the agar substrate to 4.2 g/L. Compared with the monomeric enzyme, the multimeric enzyme showed a 1.4-fold increase in tagatose production, good thermostability, and reusability. A residual activity of 75% remained, and 52% of conversion was noted after five recycles. These results indicated that the dockerin-fused chimeric enzymes on the scaffoldin successfully isomerized d-galactose into d-tagatose with synergistic activity. Thus, the results demonstrated the possibility of advancing efficient strategies for utilizing red algae as a biomass source to produce d-tagatose in the industrial food field that uses marine biomass as the feedstock.
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Affiliation(s)
- Da Woon Jeong
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Jeong Eun Hyeon
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
- Department of Food Science and Biotechnology, College of Knowledge-Based Services Engineering, Sungshin Women's University, Seoul 01133, Korea
| | - Sang Kyu Shin
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Sung Ok Han
- Department of Biotechnology, Korea University, Seoul 02841, Republic of Korea
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Zhou N, Zhang A, Wei G, Yang S, Xu S, Chen K, Ouyang P. Cadaverine Production From L-Lysine With Chitin-Binding Protein-Mediated Lysine Decarboxylase Immobilization. Front Bioeng Biotechnol 2020; 8:103. [PMID: 32195228 PMCID: PMC7062646 DOI: 10.3389/fbioe.2020.00103] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 02/03/2020] [Indexed: 12/26/2022] Open
Abstract
Lysine decarboxylase (CadA) can directly convert L-lysine to cadaverine, which is an important platform chemical that can be used to produce polyamides. However, the non-recyclable and the poor pH tolerance of pure CadA hampered its practical application. Herein, a one-step purification and immobilization procedure of CadA was established to investigate the cadaverine production from L-lysine. Renewable biomass chitin was used as a carrier for lysine decarboxylase (CadA) immobilization via fusion of a chitin-binding domain (ChBD). Scanning electron microscopy, laser scanning confocal microscopy, fourier transform infrared spectra, elemental analysis, and thermal gravimetric analysis proved that the fusion protein ChBD-CadA can be adsorbed on chitin effectively. Furthermore, the fusion protein (ChBD-CadA) existed better pH stability compared to wild CadA, and kept over 73% of the highest activity at pH 8.0. Meanwhile, the ChBD-CadA showed high specificity toward chitin and reached 93% immobilization yield within 10 min under the optimum conditions. The immobilized ChBD-CadA (I-ChBD-CadA) could efficiently converted L-lysine at 200.0 g/L to cadaverine at 135.6 g/L in a batch conversion within 120 min, achieving a 97% molar yield of the substrate L-lysine. In addition, the I-ChBD-CadA was able to be reused under a high concentration of L-lysine and retained over 57% of its original activity after four cycles of use without acid addition to maintain pH. These results demonstrate that immobilization of CadA using chitin-binding domain has the potential in cadaverine production on an industrial scale.
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Affiliation(s)
- Ning Zhou
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Alei Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Guoguang Wei
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Sai Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Sheng Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Kequan Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Pingkai Ouyang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
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Progress in research and application development of surface display technology using Bacillus subtilis spores. Appl Microbiol Biotechnol 2020; 104:2319-2331. [PMID: 31989224 PMCID: PMC7223921 DOI: 10.1007/s00253-020-10348-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 12/16/2019] [Accepted: 01/03/2020] [Indexed: 02/02/2023]
Abstract
Bacillus subtilis is a widely distributed aerobic Gram-positive species of bacteria. As a tool in the lab, it has the advantages of nonpathogenicity and limited likelihood of becoming drug resistant. It is a probiotic strain that can be directly used in humans and animals. It can be induced to produce spores under nutrient deficiency or other adverse conditions. B. subtilis spores have unique physical, chemical, and biochemical characteristics. Expression of heterologous antigens or proteins on the surface of B. subtilis spores has been successfully performed for over a decade. As an update and supplement to previously published research, this paper reviews the latest research on spore surface display technology using B. subtilis. We have mainly focused on the regulation of spore coat protein expression, display and application of exogenous proteins, and identification of developing research areas of spore surface display technology.
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Bober JR, Nair NU. Galactose to tagatose isomerization at moderate temperatures with high conversion and productivity. Nat Commun 2019; 10:4548. [PMID: 31591402 PMCID: PMC6779876 DOI: 10.1038/s41467-019-12497-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 09/13/2019] [Indexed: 02/07/2023] Open
Abstract
There are many industrially-relevant enzymes that while active, are severely limited by thermodynamic, kinetic, or stability issues (isomerases, lyases, transglycosidases). In this work, we study Lactobacillus sakeil-arabinose isomerase (LsLAI) for d-galactose to d-tagatose isomerization—that is limited by all three reaction parameters. The enzyme demonstrates low catalytic efficiency, low thermostability at temperatures > 40 °C, and equilibrium conversion < 50%. After exploring several strategies to overcome these limitations, we show that encapsulating LsLAI in gram-positive Lactobacillus plantarum that is chemically permeabilized enables reactions at high rates, high conversions, and elevated temperatures. In a batch process, this system enables ~ 50% conversion in 4 h starting with 300 mM galactose (an average productivity of 37 mM h−1), and 85% conversion in 48 h. We suggest that such an approach may be invaluable for other enzymatic processes that are similarly kinetically-, thermodynamically-, and/or stability-limited. Production of tagatose, a sugar substitute, by isomerization of galactose suffers from unfavorable enzymatic kinetics, low enzyme stability, and low equilibrium constant. Here, the authors simultaneously overcome these limitations by encapsulating l-arabinose isomerase in permeabilized Lactobacillus plantarum.
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Affiliation(s)
- Josef R Bober
- Department of Chemical and Biological Engineering, Tuts University, Medford, MA, 02155, USA
| | - Nikhil U Nair
- Department of Chemical and Biological Engineering, Tuts University, Medford, MA, 02155, USA.
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Zheng Z, Xie J, Liu P, Li X, Ouyang J. Elegant and Efficient Biotransformation for Dual Production of d-Tagatose and Bioethanol from Cheese Whey Powder. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:829-835. [PMID: 30638366 DOI: 10.1021/acs.jafc.8b05150] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this study, the dual production of valuable d-tagatose and bioethanol from lactose and cheese whey powder is presented. First, a one-pot biosynthesis involving lactose hydrolysis and d-galactose isomerization for d-tagatose production was established using crude enzymes of recombinant Escherichia coli with l-arabinose isomerase (L-AI) at 50 °C. Compared to the current enzymatic system, only L-AI was overexpressed, because of the unexpectedly thermotolerant β-galactosidase in E. coli BL21(DE3). Moreover, this high temperature rendered the d-glucose catabolism of E. coli inactive, while retaining all fermentable sugars for bioethanol fermentation. Thereafter, the mixed sugar syrup was fermented by Saccharomyces cerevisiae NL22. A total of 23.5 g/L d-tagatose and 26.9 g/L bioethanol was achieved from cheese whey powder containing 100 g/L lactose. This bioprocess not only provides an efficient method for the functionalization of byproduct whey, but also offsets the high production cost of d-tagatose and bioethanol.
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Affiliation(s)
- Zhaojuan Zheng
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
- College of Chemical Engineering , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
| | - Jiaxiao Xie
- College of Forestry , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
| | - Peng Liu
- College of Forestry , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
| | - Xin Li
- College of Chemical Engineering , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
| | - Jia Ouyang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
- College of Chemical Engineering , Nanjing Forestry University , Nanjing 210037 , People's Republic of China
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Towards efficient enzymatic conversion of D-galactose to D-tagatose: purification and characterization of L-arabinose isomerase from Lactobacillus brevis. Bioprocess Biosyst Eng 2018; 42:107-116. [PMID: 30251190 DOI: 10.1007/s00449-018-2018-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 09/19/2018] [Indexed: 10/28/2022]
Abstract
L-arabinose isomerase (L-AI) (EC 5. 3. 1. 4. L-AI) that mediates the isomerization of D-galactose to D-tagatose was isolated from Lactobacillus brevis (MF 465792), and was further purified and characterized. Pure enzyme with molecular weight of 60.1 kDa was successfully obtained after the purification using Native-PAGE gel extraction method, which was a monomer in solution. The L-AI was found to be stable at 45-75 °C, and at pH 7.0-9.0. Its optimum temperature and pH was determined as 65 °C and 7.0, respectively. Besides, we found that Ca2+, Cu2+, and Ba2+ ions inhibited the enzyme activity, whereas the enzyme activity was significantly enhanced in the presence of Mg2+, Mn2+, or Co2+ ions. The optimum concentration of Mn2+ and Co2+ was determined to be 1 mM. Furthermore, we characterized the kinetic parameters for L-AI and determined the Km (129 mM) and the Vmax (0.045 mM min- 1) values. Notably, L. brevisL-AI exhibited a high bioconversion yield of 43% from D-galactose to D-tagatose under the optimal condition, and appeared to be a more efficient catalyst compared with other L-AIs from various organisms.
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