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Park SW, Kang BH, Lee HM, Lee SJ, Kim HS, Choi HW, Park TJ, Kong KH. Efficient brazzein production in yeast (Kluyveromyces lactis) using a chemically defined medium. Bioprocess Biosyst Eng 2021; 44:913-925. [PMID: 33502625 DOI: 10.1007/s00449-020-02499-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 12/15/2020] [Indexed: 10/22/2022]
Abstract
The sweet-tasting protein brazzein offers considerable potential as a functional sweetener with antioxidant, anti-inflammatory, and anti-allergic properties. Here, we optimized a chemically defined medium to produce secretory recombinant brazzein in Kluyveromyces lactis, with applications in mass production. Compositions of defined media were investigated for two phases of fermentation: the first phase for cell growth, and the second for maximum brazzein secretory production. Secretory brazzein expressed in the optimized defined medium exhibited higher purity than in the complex medium; purification was by ultrafiltration using a molecular weight cutoff, yielding approximately 107 mg L-1. Moreover, the total media cost in this defined medium system was approximately 11% of that in the optimized complex medium to generate equal amounts of brazzein. Therefore, the K. lactis expression system is useful for mass-producing recombinant brazzein with high purity and yield at low production cost and indicates a promising potential for applications in the food industry.
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Affiliation(s)
- Se-Woong Park
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Byung-Ha Kang
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Hyeong-Min Lee
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Sung-Jun Lee
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Han-Seul Kim
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Hye-Won Choi
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea
| | - Tae Jung Park
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
| | - Kwang-Hoon Kong
- Department of Chemistry, College of Natural Sciences, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
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Akassou M, Groleau D. Advances and challenges in the production of extracellular thermoduric pullulanases by wild-type and recombinant microorganisms: a review. Crit Rev Biotechnol 2019; 39:337-350. [PMID: 30700157 DOI: 10.1080/07388551.2019.1566202] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Thermoduric pullulanases, acting as starch-debranching enzymes, are required in many industrial applications, mainly in the production of concentrated glucose, maltose, and fructose syrups. To date, however, a single pullulanase, from Bacillus acidopullulyticus, is available on the market for industrial purposes. This review is an investigation of the major advances as well as the major challenges being faced with regard to optimization of the production of extracellular thermoduric pullulanases either by their original hosts or by recombinant organisms. The critical aspects linked to industrial pullulanase production, which should always be considered, are emphasized, including those parameters influencing solubility, thermostability, and catalytic efficiency of the enzyme. This review provides new insights for improving the production of extracellular thermoduric pullulanases in the hope that such information may facilitate their commercial utilization and potentially be applied to the development of other industrially relevant enzymes.
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Affiliation(s)
- Mounia Akassou
- a Department of Chemical Engineering and Biotechnological Engineering , Faculty of Engineering, University of Sherbrooke , Sherbrooke , Canada
| | - Denis Groleau
- a Department of Chemical Engineering and Biotechnological Engineering , Faculty of Engineering, University of Sherbrooke , Sherbrooke , Canada
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Heterologous expression of the human polybromo-1 protein in the methylotrophic yeast Pichia pastoris. Protein Expr Purif 2018; 152:23-30. [PMID: 30009957 DOI: 10.1016/j.pep.2018.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/26/2018] [Accepted: 07/03/2018] [Indexed: 11/23/2022]
Abstract
The human polybromo-1 protein (BAF180) is a known driver mutation in clear cell renal cell carcinoma, where it is mutated in approximately 40% of cases. BAF180 is the chromatin-targeting subunit of the PBAF complex. BAF180 has six bromodomains, two BAH domains, and one HMG box. Bromodomains are known to recognize acetylated-lysines on histones and play a role in nucleosome recognition. BAH domains are required for ubiquitination of PCNA, a key regulator of DNA damage. The putative HMG box, if functional, may be involved in DNA-binding. While the binding specificities of individual bromodomains have been studied by our lab and others, the results have failed to reach a consensus. The acetyl-histone binding features of the full-length protein is unknown and is the motivation for this work. The hypothetical HMG and BAH domains have not been studied and the actual function of these regions is currently unknown. Thus, the precise interactions of this large and complex protein are not well-studied. Advances in understanding this large protein have been hindered by the inability to express and purify recombinant full-length BAF180 protein. Currently, only phenomenological studies using BAF180 expressed in mammalian cells have been conducted. Here, we report the successful expression, purification of full-length biologically active BAF180 protein using the GAP promoter in the heterologous host Pichia pastoris. The ability to express full-length and mutated BAF180 will allow for biophysical binding studies. Knowledge of the binding interactions is critical for us to understand the role of BAF180 in cancer development and its progression.
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Dagar VK, Khasa YP. Combined effect of gene dosage and process optimization strategies on high-level production of recombinant human interleukin-3 (hIL-3) in Pichia pastoris fed-batch culture. Int J Biol Macromol 2018; 108:999-1009. [DOI: 10.1016/j.ijbiomac.2017.11.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 10/30/2017] [Accepted: 11/02/2017] [Indexed: 02/01/2023]
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Heterologous expression of an α-amylase inhibitor from common bean (Phaseolus vulgaris) in Kluyveromyces lactis and Saccharomyces cerevisiae. Microb Cell Fact 2017; 16:110. [PMID: 28619052 PMCID: PMC5472880 DOI: 10.1186/s12934-017-0719-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 06/06/2017] [Indexed: 01/04/2023] Open
Abstract
Background Phaseolamin or α-amylase inhibitor 1 (αAI) is a glycoprotein from common beans (Phaseolus vulgaris L.) that inhibits some insect and mammalian α-amylases. Several clinical studies support the beneficial use of bean αAI for control of diabetes and obesity. Commercial extracts of P. vulgaris are available but their efficacy is still under question, mainly because some of these extracts contain antinutritional impurities naturally present in bean seeds and also exhibit a lower specific activity αAI. The production of recombinant αAI allows to overcome these disadvantages and provides a platform for the large-scale production of pure and functional αAI protein for biotechnological and pharmaceutical applications. Results A synthetic gene encoding αAI from the common bean (Phaseolus vulgaris cv. Pinto) was codon-optimised for expression in yeasts (αAI-OPT) and cloned into the protein expression vectors pKLAC2 and pYES2. The yeasts Kluyveromyces lactis GG799 (and protease deficient derivatives such as YCT390) and Saccharomyces cerevisiae YPH499 were transformed with the optimised genes and transformants were screened for expression by antibody dot blot. Recombinant colonies of K. lactis YCT390 that expressed and secreted functional αAI into the culture supernatants were selected for further analyses. Recombinant αAI from K. lactis YCT390 was purified using anion-exchange and affinity resins leading to the recovery of a functional inhibitor. The identity of the purified αAI was confirmed by mass spectrometry. Recombinant clones of S. cerevisiae YPH499 expressed functional αAI intracellularly, but did not secrete the protein. Conclusions This is the first report describing the heterologous expression of the α-amylase inhibitor 1 (αAI) from P. vulgaris in yeasts. We demonstrated that recombinant strains of K. lactis and S. cerevisiae expressed and processed the αAI precursor into mature and active protein and also showed that K. lactis secretes functional αAI. Electronic supplementary material The online version of this article (doi:10.1186/s12934-017-0719-4) contains supplementary material, which is available to authorized users.
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Englaender JA, Zhu Y, Shirke AN, Lin L, Liu X, Zhang F, Gross RA, Koffas MAG, Linhardt RJ. Expression and secretion of glycosylated heparin biosynthetic enzymes using Komagataella pastoris. Appl Microbiol Biotechnol 2016; 101:2843-2851. [PMID: 27975137 DOI: 10.1007/s00253-016-8047-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Revised: 11/28/2016] [Accepted: 12/01/2016] [Indexed: 02/08/2023]
Abstract
Heparin, an anticoagulant drug, is biosynthesized in selected animal cells. The heparin biosynthetic enzymes mainly consist of sulfotransferases and all are integral transmembrane glycoproteins. These enzymes are generally produced in engineered Escherichia coli as without their transmembrane domains as non-glycosylated fusion proteins. In this study, we used the yeast, Komagataella pastoris, to prepare four sulfotransferases involved in heparin biosynthesis as glycoproteins. While the yields of these yeast-expressed enzymes were considerably lower than E. coli-expressed enzymes, these enzymes were secreted into the fermentation media simplifying their purification and were endotoxin free. The activities of these sulfotransferases, expressed as glycoproteins in yeast, were compared to the bacterially expressed proteins. The yeast-expressed sulfotransferase glycoproteins showed improved kinetic properties than the bacterially expressed proteins.
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Affiliation(s)
- Jacob A Englaender
- Department of Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Yuanyuan Zhu
- Department of Chemical Processing Engineering of Forest Products, Nanjing Forestry University, Nanjing, China
| | - Abhijit N Shirke
- Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Lei Lin
- Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Xinyue Liu
- Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Fuming Zhang
- Chemical and Biological Engineering and Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Richard A Gross
- Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA
| | - Mattheos A G Koffas
- Department of Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA. .,Chemical and Biological Engineering and Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA.
| | - Robert J Linhardt
- Department of Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA. .,Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA. .,Chemical and Biological Engineering and Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, 12180, USA.
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Comparative Study on Different Expression Hosts for Alkaline Phytase Engineered in Escherichia coli. Appl Biochem Biotechnol 2016; 179:997-1010. [DOI: 10.1007/s12010-016-2046-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 03/07/2016] [Indexed: 10/22/2022]
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Li C, Lin Y, Zheng X, Pang N, Liao X, Liu X, Huang Y, Liang S. Combined strategies for improving expression of Citrobacter amalonaticus phytase in Pichia pastoris. BMC Biotechnol 2015; 15:88. [PMID: 26410558 PMCID: PMC4584009 DOI: 10.1186/s12896-015-0204-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 09/09/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Phytase is used as an animal feed additive that degrades phytic acid and reduces feeding costs and pollution caused by fecal excretion of phosphorus. Some phytases have been expressed in Pichia pastoris, among which the phytase from Citrobacter amalonaticus CGMCC 1696 had high specific activity (3548 U/mg). Improvement of the phytase expression level will contribute to facilitate its industrial applications. METHODS To improve the phytase expression, we use modification of P AOX1 and the α-factor signal peptide, increasing the gene copy number, and overexpressing HAC1 (i) to enhance folding and secretion of the protein in the endoplasmic reticulum. The genetic stability and fermentation in 10-L scaled-up fed-batch fermenter was performed to prepare for the industrial production. RESULTS The phytase gene from C. amalonaticus CGMCC 1696 was cloned under the control of the AOX1 promoter (P AOX1 ) and expressed in P. pastoris. The phytase activity achieved was 414 U/mL. Modifications of P AOX1 and the α-factor signal peptide increased the phytase yield by 35 and 12%, respectively. Next, on increasing the copy number of the Phy gene to six, the phytase yield was 141% higher than in the strain containing only a single gene copy. Furthermore, on overexpression of HAC1 (i) (i indicating induced), a gene encoding Hac1p that regulates the unfolded protein response, the phytase yield achieved was 0.75 g/L with an activity of 2119 U/mL, 412% higher than for the original strain. The plasmids in this high-phytase expression strain were stable during incubation at 30 °C in Yeast Extract Peptone Dextrose (YPD) Medium. In a 10-L scaled-up fed-batch fermenter, the phytase yield achieved was 9.58 g/L with an activity of 35,032 U/mL. DISCUSSION The production of a secreted protein will reach its limit at a specific gene copy number where further increases in transcription and translation due to the higher abundance of gene copies will not enhance the secretion process any further. Enhancement of protein folding in the ER can alleviate bottlenecks in the folding and secretion pathways during the overexpression of heterologous proteins in P. pastoris. CONCLUSIONS Using modification of P AOX1 and the α-factor signal peptide, increasing the gene copy number, and overexpressing HAC1 (i) to enhance folding and secretion of the protein in the endoplasmic reticulum, we have successfully increased the phytase yield 412% relative to the original strain. In a 10-L fed-batch fermenter, the phytase yield achieved was 9.58 g/L with an activity of 35,032 U/mL. Large-scale production of phytase can be applied towards different biocatalytic and feed additive applications.
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Affiliation(s)
- Cheng Li
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Ying Lin
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Xueyun Zheng
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Nuo Pang
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Xihao Liao
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Xiaoxiao Liu
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Yuanyuan Huang
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
| | - Shuli Liang
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. .,Guangdong Research Center of Industrial Enzyme and Green Manufacturing Technology, School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China.
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Li YY, Zhong KX, Hu AH, Liu DN, Chen LZ, Xu SD. High-level expression and characterization of a thermostable xylanase mutant from Trichoderma reesei in Pichia pastoris. Protein Expr Purif 2014; 108:90-96. [PMID: 25434687 DOI: 10.1016/j.pep.2014.11.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 11/18/2014] [Accepted: 11/19/2014] [Indexed: 10/24/2022]
Abstract
A gene encoding xylanase 2 mutant from Trichoderma reesei (T2C/T28C, named mxyn2) was cloned into the Pichia pastoris X33 strain using the vector pPICZαA. Recombinant Mxyn2p was functionally expressed in P. pastoris X33 and secreted into the supernatant. Real time qPCR demonstrated that an increase in gene copy number correlated with higher levels of expression. Supernatant from methanol induced cells was concentrated by ultrafiltration with a 10kDa cut off membrane, and purified with ion exchange chromatography using SP Sepharose Fast Flow chromatography. Recombinant Mxyn2p protein had the highest activity at 75°C, while recombinant protein encoded by the "wild type" xylanase gene xyn2, also expressed in Pichia, was 20°C lower. The Mxyn2p enzyme retained more than 70% of its activity after incubation at 80°C for 10min. The effects of the optimal pH and temperature for higher expression levels in P. pastoris were also determined, 6.0 and 22°C, respectively. The maximum xylanase activity of Mxyn2p was 13,000nkat/mg (9.88g/l) in fed-batch cultivation after 168h induction with methanol in a 50l bioreactor.
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Affiliation(s)
- Yang-Yuan Li
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China.
| | - Kai-Xin Zhong
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China
| | - Ai-Hong Hu
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China
| | - Dan-Ni Liu
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China
| | - Li-Zhi Chen
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China
| | - Shu-de Xu
- Guangdong VTR Bio-Tech Co., Ltd., Zhuhai 519060, Guangdong, China; Guangdong Feed Additive Research and Development Center, Zhuhai 519060, Guangdong, China
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Zhou X, Yu Y, Tao J, Yu L. Production of LYZL6, a novel human c-type lysozyme, in recombinant Pichia pastoris employing high cell density fed-batch fermentation. J Biosci Bioeng 2014; 118:420-5. [DOI: 10.1016/j.jbiosc.2014.03.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/03/2014] [Accepted: 03/15/2014] [Indexed: 11/28/2022]
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High efficient expression of a functional humanized single-chain variable fragment (scFv) antibody against CD22 in Pichia pastoris. Appl Microbiol Biotechnol 2014; 98:10023-39. [PMID: 25239038 DOI: 10.1007/s00253-014-6071-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 09/02/2014] [Accepted: 09/03/2014] [Indexed: 12/29/2022]
Abstract
Single-chain variable fragments (scFvs) have recently emerged as attractive candidates in targeted immunotherapy of various malignancies. The anti-CD22 scFv is able to target CD22, on B cell surface and is being considered as a promising molecule in targeted immunotherapy of B cell malignancies. The recombinant anti-CD22 scFv has been successfully expressed in Escherichia coli; however, the insufficient production yield has been a major bottleneck for its therapeutic application. The methylotrophic yeast Pichia pastoris has become a highly popular expression host for the production of a wide variety of recombinant proteins such as antibody fragments. In this study, we used the Pichia expression system to express a humanized scFv antibody against CD22. The full-length humanized scFv gene was codon optimized, cloned into the pPICZαA and expressed in GS115 strain. The maximum production level of the scFv (25 mg/L) were achieved at methanol concentration, 1 %; pH 6.0; inoculum density, OD600 = 3 and the induction time of 72 h. The correlation between scFv gene dosage and expression level was also investigated by real-time PCR, and the results confirmed the presence of such correlation up to five gene copies. Immunofluorescence and flow cytometry studies and Biacore analysis demonstrated binding to CD22 on the surface of human lymphoid cell line Raji and recombinant soluble CD22, respectively. Taken together, the presented data suggest that the Pichia pastoris can be considered as an efficient host for the large-scale production of anti-CD22 scFv as a promising carrier for targeted drug delivery in treatment of CD22(+) B cell malignancies.
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Dong JX, Xie X, Hu DW, Chen SC, He YS, Beier RC, Shen YD, Sun YM, Xu ZL, Wang H, Yang JY. Codon modification for the DNA sequence of a single-chain Fv antibody against clenbuterol and expression in Pichia pastoris. Appl Microbiol Biotechnol 2013; 98:3679-89. [PMID: 24190495 DOI: 10.1007/s00253-013-5324-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Revised: 10/08/2013] [Accepted: 10/09/2013] [Indexed: 10/26/2022]
Abstract
The expression efficiency was improved for the recombinant single-chain variable fragment (scFv) against clenbuterol (CBL) obtained from mouse and expressed in the methylotrophic yeast Pichia pastoris GS115, by redesigning and synthesizing the DNA sequence encoding for CBL-scFv based on the codon bias of P. pastoris. The codons encoding 124 amino acids were optimized, in which a total of 156 nucleotides were changed, and the G+C ratio was simultaneously decreased from 53 to 47.2 %. Under the optimized expression conditions, the yield of the recombinant CBL-scFv (41 kDa) antibodies was 0.223 g L⁻¹ in shake culture. Compared to the non-optimized control, the expression level of the optimized recombinant CBL-scFv based on preferred codons in P. pastoris demonstrated a 2.35-fold higher yield. Furthermore, the recombinant CBL-scFv was purified by Ni-NTA column chromatography, and the purity was 95 %. The purified CBL-scFv showed good CBL recognition by a competitive indirect enzyme-linked immunoassay. The average concentration required for 50 % inhibition of binding and the limit of detection for the assay were 5.82 and 0.77 ng mL⁻¹, respectively.
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Affiliation(s)
- Jie-Xian Dong
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou, Guangdong Province, 510642, People's Republic of China
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A dynamic method for the investigation of induced state metabolic capacities as a function of temperature. Microb Cell Fact 2013; 12:94. [PMID: 24127686 PMCID: PMC4015482 DOI: 10.1186/1475-2859-12-94] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 09/27/2013] [Indexed: 11/19/2022] Open
Abstract
Background Science-based recombinant bioprocess designs as well as the design of statistical experimental plans for process optimization (Design of Experiments, DoE) demand information on physiological bioprocess boundaries, such as the onset of acetate production, adaptation times, mixed feed metabolic capabilities or induced state maximum metabolic rates as at the desired cultivation temperature. Dynamic methods provide experimental alternatives to determine this information in a fast and efficient way. Information on maximum metabolic capabilities as a function of temperature is needed in case a reduced cultivation temperature is desirable (e.g. to avoid inclusion body formation) and an appropriate feeding profile is to be designed. Results Here, we present a novel dynamic method for the determination of the specific growth rate as a function of temperature for induced recombinant bacterial bioprocesses. The method is based on the control of the residual substrate concentration at non-limiting conditions with dynamic changes in cultivation temperature. The presented method was automated in respect to information extraction and closed loop control by means of in-line Fourier Transformation Infrared Spectroscopy (FTIR) residual substrate measurements and on-line first principle rate-based soft-sensors. Maximum induced state metabolic capabilities as a function of temperature were successfully extracted for a recombinant E. coli C41 fed-batch bioprocess without the need for sampling in a time frame of 20 hours. Conclusions The presented method was concluded to allow the fast and automated extraction of maximum metabolic capabilities (specific growth rate) as a function of temperature. This complements the dynamic toolset necessary for science-based recombinant bacterial bioprocess design and DoE design.
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Tai HM, Yin LJ, Chen WC, Jiang ST. Overexpression of Escherichia coli phytase in Pichia pastoris and its biochemical properties. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:6007-6015. [PMID: 23738921 DOI: 10.1021/jf401853b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To obtain a Pichia pastoris mutant with an Escherichia coli phytase gene, which was synthesized according to P. pastoris codon preference, a mature phytase cDNA of E. coli being altered according to the codons usage preference of P. pastoris was artificially synthesized and cloned into an expression vector of pGAPZαC. The final extracellular phytase activity was 112.5 U/mL after 72 h of cultivation. The phytase, with a molecular mass of 46 kDa, was purified to electrophoretical homogeneity after Ni Sepharose 6 Fast Flow chromatography. The yield, purification fold, and specific activity were 63.97%, 26.17, and 1.57 kU/mg, respectively. It had an optimal pH and temperature of 4.0-6.0 and 50 °C, respectively, and was stable at pH 3.0-8.0 and 25-40 °C. The purified recombinant phytase was resistant to trypsin, highly inhibited by Cu(2+), Zn(2+), Hg(2+), Fe(2+), Fe(3+), phenylmethylsulfonyl fluoride, and N-tosyl-l-lysine chloromethyl ketone, but activated by Mg(2+), Ca(2+), Sr(2+), Ba(2+), glutathione, ethylenediaminetetraacetic acid, and N-ethylmaleimide. It revealed higher affinity to calcium phytate than to other phosphate conjugates.
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Affiliation(s)
- Hsueh-Ming Tai
- Department of Food and Nutrition, Providence University , Number 200, Section 7, Taiwan Boulevard, Salu, Taichung 43301, Taiwan
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