1
|
Homma T, Terui S, Yokoyama F, Okino S, Ohta S, Kato C, Haraguchi N, Fujisawa I, Itsuno S, Ang LZP. Simple production of resilin-like protein hydrogels using the Brevibacillus secretory expression system and column-free purification. Biotechnol Bioeng 2023; 120:194-202. [PMID: 36253915 DOI: 10.1002/bit.28267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 09/28/2022] [Accepted: 10/11/2022] [Indexed: 11/11/2022]
Abstract
Resilin, an insect structural protein, has excellent flexibility, photocrosslinking properties, and temperature responsiveness. Recombinant resilin-like proteins (RLPs) can be fabricated into three-dimensional (3D) structures for use as cell culture substrates and highly elastic materials. A simplified, high-yielding production process for RLPs is required for their widespread application. This study proposes a simple production process combining extracellular expression using Brevibacillus choshinensis (B. choshinensis) and rapid column-free purification. Extracellular production was tested using four representative signal peptides; B. choshinensis was found to efficiently secrete Rec1, an RLP derived from Drosophila melanogaster, regardless of the type of signal peptide. However, it was suggested that Rec1 is altered by an increase in the pH of the culture medium associated with prolonged incubation. Production in a jar fermentor with controllable pH yielded 530 mg Rec1 per liter of culture medium, which is superior to productivity using other hosts. The secreted Rec1 was purified from the culture supernatant via (NH4 )2 SO4 and ethanol precipitations, and the purified Rec1 was applied to ring-shaped 3D hydrogels. These results indicate that the combination of secretory production using B. choshinensis and column-free purification can accelerate the further application of RLPs.
Collapse
Affiliation(s)
- Toshimasa Homma
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Shu Terui
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Fuki Yokoyama
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Saki Okino
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Sora Ohta
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Chihiro Kato
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| | - Naoki Haraguchi
- Department of Applied Chemistry & Life Science, Toyohashi University of Technology, Toyohashi, Aichi, Japan
| | - Ikuhide Fujisawa
- Department of Applied Chemistry & Life Science, Toyohashi University of Technology, Toyohashi, Aichi, Japan
| | - Shinichi Itsuno
- Department of Applied Chemistry & Life Science, Toyohashi University of Technology, Toyohashi, Aichi, Japan.,National Institute of Technology, Gifu College, Motosu, Gifu, Japan
| | - Lily Zuin Ping Ang
- Division of Chemical Engineering and Biotechnology, National Institute of Technology, Ichinoseki College, Ichinoseki Iwate, Japan
| |
Collapse
|
2
|
Biasoto HP, Hebeda CB, Farsky SHP, Pessoa A, Costa-Silva TA, Monteiro G. Extracellular expression of Saccharomyces cerevisiae's L-asparaginase II in Pichia pastoris results in novel enzyme with better parameters. Prep Biochem Biotechnol 2022; 53:511-522. [PMID: 35981094 DOI: 10.1080/10826068.2022.2111582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
L-asparaginase (ASNase) is an efficient inhibitor of tumor development, used in chemotherapy sessions against acute lymphoblastic leukemia (ALL) tumor cells; its use results in 80% complete remission of the disease in treated patients. Saccharomyces cerevisiae's L-asparaginase II (ScASNaseII) has a high potential to substitute bacteria ASNase in patients that developed hypersensitivity, but the endogenous production of it results in hypermannosylated immunogenic enzyme. Here we describe the genetic process to acquire the ScASNaseII expressed in the extracellular medium. Our strategy involved a fusion of mature sequence of protein codified by ASP3 (amino acids 26-362) with the secretion signal sequence of Pichia pastoris acid phosphatase enzyme; in addition, this DNA construction was integrated in P. pastoris Glycoswitch® strain genome, which has the cellular machinery to express and secrete high quantity of enzymes with humanized glycosylation. Our data show that the DNA construction and strain employed can express extracellular asparaginase with specific activity of 218.2 IU mg-1. The resultant enzyme is 40% more stable than commercially available Escherichia coli's ASNase (EcASNaseII) when incubated with human serum. In addition, ScASNaseII presents 50% lower cross-reaction with anti-ASNase antibody produced against EcASNaseII when compared with ASNase from Dickeya chrysanthemi.
Collapse
Affiliation(s)
- Henrique P Biasoto
- Departamento de Tecnologia Bioquímico-Farmacêutica, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Cristina B Hebeda
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Sandra H P Farsky
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Adalberto Pessoa
- Departamento de Tecnologia Bioquímico-Farmacêutica, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| | - Tales A Costa-Silva
- Centro de Ciencias Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, Brazil
| | - Gisele Monteiro
- Departamento de Tecnologia Bioquímico-Farmacêutica, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, São Paulo, Brazil
| |
Collapse
|
3
|
Meng Q, Tian X, Jiang B, Zhou L, Chen J, Zhang T. Characterization and enhanced extracellular overexpression of a new salt-activated alginate lyase. J Sci Food Agric 2021; 101:5154-5162. [PMID: 33608926 DOI: 10.1002/jsfa.11161] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/11/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Alginate lyases (EC 4.4.2.3/4.4.2.11) have been applied to produce alginate oligosaccharides, which have physiological advantages such as prebiotic and antidiabetic effects, and are of benefit in the food and pharmaceutical industries. Extracellular production of recombinant proteins in Escherichia coli presents advantages including simplified downstream processing and high productivity; however, the presence of certain signal peptides does not always ensure successful secretion, which make the extracellular production of alginate lyase in E. coli rarely reported but of great significance. RESULTS A PL7 family alginate lyase, Aly01, with its native signal peptide from Vibrio natriegens SK42.001, was identified, characterized, and extracellularly expressed in E. coli. The enzyme specifically released trisaccharide from alginate and was strictly NaCl activated. Green fluorescent protein (GFP) was fused with the Aly01 signal peptide and successfully secreted in E. coli to expand the feasibility of using this signal peptide to produce other heterologous proteins extracellularly. Through a synergistic strategy of utilizing Terrific Broth (TB) medium supplemented with 120 mmol L-1 glycine and 10 mmol L-1 calcium, the lag phase of protein secretion was reduced to 3 h from 12 h; meanwhile calcium remedied glycine-related cell growth impairment, leading to further enhancement of overall enzyme productivity, reaching a maximum of 4.55 U mL-1 . CONCLUSION A new salt-activated alginate lyase, Aly01, was identified and characterized. E. coli employed its signal peptide and extracellularly expressed both Aly01 and a GFP, which indicated the signal peptide of Aly01 could be a powerful tool for extracellular production of other heterologous proteins in E. coli. © 2021 Society of Chemical Industry.
Collapse
Affiliation(s)
- Qing Meng
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Xinyu Tian
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Bo Jiang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, China
| | - Licheng Zhou
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Jingjing Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| | - Tao Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
| |
Collapse
|
4
|
Li L, Qu W, Jin M, Di W, Zeng R. Extracellular expression of agarase rAgaM1 in Bacillus subtilis and its ability for neoagaro-oligosaccharide production. J Basic Microbiol 2019; 59:359-367. [PMID: 30672599 DOI: 10.1002/jobm.201800442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 12/20/2018] [Accepted: 12/25/2018] [Indexed: 11/11/2022]
Abstract
An agarase gene (agaM1) was cloned, expressed and characterized by using Escherichia coli as host strain, revealing the outstanding properties of recombinant AgaM1 (rAgaM1) in agarose degradation and neoagaro-oligosaccharides (NAs) production in our previous work. In current study, agaM1 was extracellularly expressed in Bacillus subtilis, and we aim to assess the ability of the supernatant of recombinant B. subtilis fermentation broth containing rAgaM1 to degrade agarose without protein purification, which would save the cost of purification and avoid the activity loss during purification. The pH and temperature optima for the supernatant were 7.0 and 50 °C, respectively. The supernatant containing rAgaM1 has outstanding stability against 40 °C and 50 °C. Besides, we detailedly studied the possible influence factors of rAgaM1 expression in the supernatant, including pH, temperature, isopropyl β-D-thiogalactoside (IPTG) concentration, initial optical density at a wavelength of 600 nm (OD600 ), and induction time, and the optimum conditions for rAgaM1 expression by B. subtilis were confirmed. Moreover, the supernatant was able to produce NAs by using the Gracilaria lemaneiformis, whose cells were broken by autoclaving, as substrate, and a total of 1.41 µmol ml-1 of NA, including neoagarotetraose and neoagarohexaose, was produced after degradation for 48 h. This ability could save the cost of substrates in NA production, although the method requires a further study. Our results reveal that the NAs with great potential in food and pharmaceutical industries could be inexpensive to make by the supernatant containing rAgaM1 of B. subtilis fermentation broth in the foreseeable future.
Collapse
Affiliation(s)
- Li Li
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), Xiamen, China
| | - Wu Qu
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), Xiamen, China.,School of Life Sciences, Xiamen University, Xiamen, China
| | - Min Jin
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), Xiamen, China
| | - Wenjie Di
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), Xiamen, China
| | - Runying Zeng
- Key Laboratory of Marine Genetic Resources, Third Institute of Oceanography, State Oceanic Administration (SOA), Xiamen, China.,Key Laboratory of Marine Genetic Resources, Fujian Province, Xiamen, China
| |
Collapse
|
5
|
Gao W, Yin J, Bao L, Wang Q, Hou S, Yue Y, Yao W, Gao X. Engineering Extracellular Expression Systems in Escherichia coli Based on Transcriptome Analysis and Cell Growth State. ACS Synth Biol 2018; 7:1291-1302. [PMID: 29668266 DOI: 10.1021/acssynbio.7b00400] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Escherichia coli extracellular expression systems have a number of advantages over other systems, such as lower pyrogen levels and a simple purification process. Various approaches, such as the generation of leaky mutants via chromosomal engineering, have been explored for this expression system. However, extracellular protein yields in leaky mutants are relatively low compared to that in intracellular expression systems and therefore need to be improved. In this work, we describe the construction, characterization, and mechanism of enhanced extracellular expression in Escherichia coli. On the basis of the localizations, functions, and transcription levels of cell envelope proteins, we systematically elucidated the effects of multiple gene deletions on cell growth and extracellular expression using modified CRISPR/Cas9-based genome editing and a FlAsH labeling assay. High extracellular yields of heterologous proteins of different sizes were obtained by screening multiple gene mutations. The enhancement of extracellular secretion was associated with the derepression of translation and translocation. This work utilized universal methods in the design of extracellular expression systems for genes not directly associated with protein synthesis that were used to generate strains with higher protein expression capability. We anticipate that extracellular expression systems may help to shed light on the poorly understood aspects of these secretion processes as well as to further assist in the construction of engineered prokaryotic cells for efficient extracellular production of heterologous proteins.
Collapse
Affiliation(s)
- Wen Gao
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Jun Yin
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Lichen Bao
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Qun Wang
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Shan Hou
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Yali Yue
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Wenbing Yao
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| | - Xiangdong Gao
- Jiangsu Key Laboratory of Druggability of Biopharmaceuticals and State Key Laboratory of Natural Medicines, School of Life Science and Technology, China Pharmaceutical University, Nanjing 210009, China
| |
Collapse
|
6
|
Lin L, Li L, Zhou C, Li J, Liu J, Shu R, Dong B, Li Q, Wang Z. A HER2 bispecific antibody can be efficiently expressed in Escherichia coli with potent cytotoxicity. Oncol Lett 2018; 16:1259-1266. [PMID: 29963199 DOI: 10.3892/ol.2018.8698] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Accepted: 03/07/2018] [Indexed: 12/26/2022] Open
Abstract
Bispecific antibodies have been actively studied for cancer therapy due to their potent cytotoxicity against tumor cells. A number of bispecific antibody formats have exhibited strong tumor cytotoxicity in vitro and in vivo. However, effective production of bispecific antibodies remains challenging for the majority of bispecific antibody formats. In the present study, a bispecific antibody was designed that links a conventional antigen-binding fragment (Fab) against cluster of differentiation 3 antigen (CD3) to a camel single domain antibody (VHH) against human epidermal growth factor receptor 2 (HER2). This bispecific antibody may be secreted and purified efficiently from Escherichia coli culture medium. The purified bispecific antibody is able to trigger T cell-mediated HER2-specific cytotoxicity in vitro and in vivo. The data gathered in the present study suggest that this bispecific format may be applied to other tumor antigens to produce bispecific antibodies more efficiently.
Collapse
Affiliation(s)
- Limin Lin
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Li Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Changhua Zhou
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Jing Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Jiayu Liu
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Rui Shu
- Ying Rui, Inc., Guangzhou, Guangdong 510009, P.R. China
| | - Bin Dong
- School of Biosciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, Guangdong 510009, P.R. China
| | - Qing Li
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| | - Zhong Wang
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China.,Center for Cellular and Structural Biology, Sun Yat-Sen University, Guangzhou, Guangdong 510006, P.R. China
| |
Collapse
|
7
|
Bai YP, Luo XJ, Zhao YL, Li CX, Xu DS, Xu JH. Efficient Degradation of Malathion in the Presence of Detergents Using an Engineered Organophosphorus Hydrolase Highly Expressed by Pichia pastoris without Methanol Induction. J Agric Food Chem 2017; 65:9094-9100. [PMID: 28949531 DOI: 10.1021/acs.jafc.7b03405] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The biodegradation of pesticides by organophosphorus hydrolases (OPHs) requires an efficient enzyme production technology in industry. Herein, a Pichia pastoris strain was constructed for the extracellular expression of PoOPHM9, an engineered malathion-degrading enzyme. After optimization, the maximum titer and yield of fermentation reached 50.8 kU/L and 4.1 gprotein/L after 3 days, with the highest space-time yield (STY) reported so far, 640 U L-1 h-1. PoOPHM9 displayed its high activity and stability in the presence of 0.1% (w/w) plant-derived detergent. Only 0.04 mg/mL enzyme could completely remove 0.15 mM malathion in aqueous solution within 20 min. Furthermore, 12 μmol malathion on apples and cucumbers surfaces was completely removed by 0.05 mg/mL PoOPHM9 in tap water after 35 min washing. The efficient production of the highly active PoOPHM9 has cleared a major barrier to biodegradation of pesticide residues in food industry.
Collapse
Affiliation(s)
- Yun-Peng Bai
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Xiao-Jing Luo
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Yu-Lian Zhao
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Chun-Xiu Li
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Dian-Sheng Xu
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| | - Jian-He Xu
- State Key Laboratory of Bioreactor Engineering and ‡School of Biotechnology, East China University of Science and Technology , Shanghai 200237, P. R. China
| |
Collapse
|
8
|
Abstract
Metalloprotease PT121 and its mutant Y114S (Tyr114 was substituted to Ser) are effective catalysts for the synthesis of Z-aspartame (Z-APM). This study presents the selection of a suitable signal peptide for improving expression and extracellular secretion of proteases PT121 and Y114S by Escherichia coli. Co-inducers containing IPTG and arabinose were used to promote protease production and cell growth. Under optimal conditions, the expression levels of PT121 and Y114S reached >500 mg/L, and the extracellular activity of PT121/Y114S accounted for 87/82% of the total activity of proteases. Surprisingly, purer protein was obtained in the supernatant, because arabinose reduced cell membrane permeability, avoiding cell lysis. Comparison of Z-APM synthesis and caseinolysis between proteases PT121 and Y114S showed that mutant Y114S presented remarkably higher activity of Z-APM synthesis and considerably lower activity of caseinolysis. The significant difference in substrate specificity renders these enzymes promising biocatalysts.
Collapse
Affiliation(s)
- Fucheng Zhu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Feng Liu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Bin Wu
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| | - Bingfang He
- College of Biotechnology and Pharmaceutical Engineering and ‡School of Pharmaceutical Sciences, Nanjing Tech University , No. 30 Puzhu South Road, Nanjing 211816, China
| |
Collapse
|
9
|
Zhan R, Mu W, Jiang B, Li Y, Zhou L, Zhang T. High-level extracellular expression of inulin fructotransferase in Pichia pastoris for DFA III production. J Sci Food Agric 2015; 95:1408-1413. [PMID: 25257988 DOI: 10.1002/jsfa.6931] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 08/24/2014] [Accepted: 09/20/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND Inulin fructotransferase (IFTase) catalyzes inulin conversion to difructose anhydride (DFA III), which is a natural low-calorie sweetener. Although heterologous expression of IFTase was achieved in Escherichia coli, the extracellular enzyme activity was very low, which limited the commercialization of IFTase. RESULTS Active IFTase of about 43 kDa molecular mass of subunit was extracellularly expressed by Pichia pastoris and was greatly regulated by the IFTase gene copy number integrated into the P. pastoris genome and by the methanol concentration in the induction phase. Under optimized culture conditions, multicopy P. pastoris exhibited a maximum extracellular IFTase activity of 105.4 U mL(-1) in a 5 L fermenter, which was 8.9-fold the activity in shake flasks and 5.3-fold that obtained from wild-type strain. CONCLUSION IFTase was expressed in a eukaryotic P. pastoris system for the first time and achieved high-level extracellular expression using a high-cell-density fed-batch cultivation strategy. This demonstrated that P. pastoris was a good candidate for potential DFA III production as a novel IFTase expression system.
Collapse
Affiliation(s)
- Rongrong Zhan
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, China; Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, 214122, China
| | | | | | | | | | | |
Collapse
|