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Bivar Matias SC, de Azevedo B, da Costa Filho JDB, Lima MM, Moura AD, Arantes Martins DR, de Sousa Júnior FC, Santos ESD. Enhancing the expression of multi-antigen chimeric TGAGS/BST protein from Toxoplasma gondii in Escherichia coli BL 21 Star during batch cultivation. Protein Expr Purif 2023; 201:106173. [DOI: 10.1016/j.pep.2022.106173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/06/2022] [Accepted: 09/09/2022] [Indexed: 11/30/2022]
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2
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Marivate A, Njengele-Tetyana Z, Fish MQ, Mosebi S. Recombinant expression, purification, and characterization of full-length human BST-2 from Escherichia coli. Protein Expr Purif 2021; 188:105969. [PMID: 34500069 DOI: 10.1016/j.pep.2021.105969] [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: 05/21/2021] [Revised: 08/20/2021] [Accepted: 09/05/2021] [Indexed: 11/25/2022]
Abstract
HIV-1 virus release from infected cells is blocked by human BST-2, but HIV-1 Vpu efficiently antagonises BST-2 due to direct transmembrane domain interactions that occur between each protein. Targeting the interaction between these two proteins is seen as viable for HIV-1 antiviral intervention. This study describes the successful over-expression and purification of a recombinant full-length human BST-2 from inclusion bodies using affinity and anion exchange chromatography. Two milligrams of purified full-length BST-2 were produced per litre of BL21 (DE3) T7 Express® pLysY E. coli culture. Far-UV circular dichroism validated the renaturing of the recombinant protein and retention of its secondary structure. Furthermore, through ELISA, a known human BST-2 binding partner, HIV-1 Vpu, was shown to bind to the renatured and purified protein, further validating its folding. To our knowledge this is the first report of the purification of a wild-type, full-length human BST-2 from Escherichia coli.
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Affiliation(s)
- Amukelani Marivate
- Biomedical Group, Advanced Materials Division, Mintek, Randburg, 2125, South Africa.
| | | | - Muhammad Qasim Fish
- Biomedical Group, Advanced Materials Division, Mintek, Randburg, 2125, South Africa
| | - Salerwe Mosebi
- Department of Life and Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Private Bag X6, Florida, 1710, South Africa
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Aghdam MA, Tohidkia MR, Ghamghami E, Ahmadikhah A, Khanmahamadi M, Baradaran B, Mokhtarzadeh A. Implementation of a Design of Experiments to Improve Periplasmic Yield of Functional ScFv Antibodies in a Phage Display Platform. Adv Pharm Bull 2021; 12:583-592. [PMID: 35935041 PMCID: PMC9348535 DOI: 10.34172/apb.2022.061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/01/2021] [Accepted: 07/02/2021] [Indexed: 11/16/2022] Open
Abstract
Purpose: Production of functional recombinant antibody fragments in the periplasm of E. coli is a prerequisite step to achieve sufficient reagent for preclinical studies. Thus, the cost-effective and lab-scale production of antibody fragments demands the optimization of culture conditions.
Methods: The culture conditions such as temperature, optical density (OD600) at induction, induction time, and IPTG concentration were investigated to optimize the functional expression of a phage-derived scFv molecule using a design of experiment (DoE). Additionally, the effects of different culture media and osmolyte supplements on the expression yield of scFv were examined.
Results: The developed 2FI regression model indicated the significant linear effect of the incubation temperature, the induction time, and the induction OD600 on the expression yield of functional scFv. Besides, the statistical analysis indicated that two significant interactions of the temperature/induction time and the temperature/induction OD600 significantly interplay to increase the yield. Further optimization showed that the expression level of functional scFv was the most optimal when the cultivation was undertaken either in the TB medium or in the presence of media supplements of 0.5 M sorbitol or 100 mM glycine betaine.
Conclusion: In the present study, for the first time, we successfully implemented DoE to comprehensively optimize the culture conditions for the expression of scFv molecules in a phage antibody display setting, where scFv molecules can be isolated from a tailor-made phage antibody library known as "Human Single Fold scFv Library I."
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Affiliation(s)
- Marjan Abri Aghdam
- Department of Biological Science, Faculty of Basic Science, Higher Education Institute of Rab-Rashid, Tabriz, Iran
| | - Mohammad Reza Tohidkia
- Research Center for Pharmaceutical Nanotechnology, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Ghamghami
- Department of Biological Science, Faculty of Basic Science, Higher Education Institute of Rab-Rashid, Tabriz, Iran
| | - Asadollah Ahmadikhah
- Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, G.C Velenjak, Tehran, Iran
| | - Morteza Khanmahamadi
- Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ahad Mokhtarzadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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Nawade B, Yahyaa M, Davidovich-Rikanati R, Lewinsohn E, Ibdah M. Optimization of Culture Conditions for the Efficient Biosynthesis of Trilobatin from Phloretin by Engineered Escherichia coli Harboring the Apple Phloretin-4'- O-glycosyltransferase. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:14212-14220. [PMID: 33089679 DOI: 10.1021/acs.jafc.0c04964] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Trilobatin, a dihydrochalcone glucoside and natural sweetener, has diverse biological and therapeutic properties. In the present study, we developed a microbial system to produce trilobatin from phloretin using Escherichia coli (E. coli) overexpressing the phloretin-4'-O-glycosyltransferase from Malus x domestica Borkh. Various optimization strategies were employed for the efficient production of trilobatin using a one-factor-at-a-time method. The effect of UDP-glucose supplementation, substrate, and inducer concentrations, time of substrate feeding as well as protein induction, and different culture media combinations were evaluated and optimized to enhance the production of trilobatin. As a result, the highest trilobatin production, 246.83 μM (107.64 mg L-1), was obtained with an LB-TB medium combination, 22 h of induction with 0.1 mM IPTG followed by 4 h of feeding with 250 μM phloretin and without extracellular UDP-glucose supplementation. These results demonstrate the efficient production of trilobatin and constitute a promising foundation for large-scale production of the dihydrochalcone glycosides in engineered E. coli.
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Affiliation(s)
- Bhagwat Nawade
- Newe Ya'ar Research Center, ARO, Ramat Yishay 30095, Israel
| | - Mosaab Yahyaa
- Newe Ya'ar Research Center, ARO, Ramat Yishay 30095, Israel
| | | | | | - Mwafaq Ibdah
- Newe Ya'ar Research Center, ARO, Ramat Yishay 30095, Israel
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Carrillo-Campos J. Estructura y función de las oxigenasas tipo Rieske/mononuclear. TIP REVISTA ESPECIALIZADA EN CIENCIAS QUÍMICO-BIOLÓGICAS 2019. [DOI: 10.22201/fesz.23958723e.2019.0.196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Las oxigenasas Rieske/mononuclear son un grupo de metaloenzimas que catalizan la oxidación de una variedad de compuestos, destaca su participación en la degradación de compuestos xenobióticos contaminantes; estas enzimas también participan en la biosíntesis de algunos compuestos de interés comercial. Poseen una amplia especificidad por el sustrato, convirtiéndolas en un grupo de enzimas con un alto potencial de aplicación en procesos biotecnológicos que hasta el momento no ha sido explotado. La presente revisión aborda aspectos generales acerca de la función y estructura de este importante grupo de enzimas.
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Díaz-Dinamarca DA, Jerias JI, Soto DA, Soto JA, Díaz NV, Leyton YY, Villegas RA, Kalergis AM, Vásquez AE. The Optimisation of the Expression of Recombinant Surface Immunogenic Protein of Group B Streptococcus in Escherichia coli by Response Surface Methodology Improves Humoral Immunity. Mol Biotechnol 2018; 60:215-225. [PMID: 29442290 DOI: 10.1007/s12033-018-0065-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Group B Streptococcus (GBS) is the leading cause of neonatal meningitis and a common pathogen in livestock and aquaculture industries around the world. Conjugate polysaccharide and protein-based vaccines are under development. The surface immunogenic protein (SIP) is a conserved protein in all GBS serotypes and has been shown to be a good target for vaccine development. The expression of recombinant proteins in Escherichia coli cells has been shown to be useful in the development of vaccines, and the protein purification is a factor affecting their immunogenicity. The response surface methodology (RSM) and Box-Behnken design can optimise the performance in the expression of recombinant proteins. However, the biological effect in mice immunised with an immunogenic protein that is optimised by RSM and purified by low-affinity chromatography is unknown. In this study, we used RSM for the optimisation of the expression of the rSIP, and we evaluated the SIP-specific humoral response and the property to decrease the GBS colonisation in the vaginal tract in female mice. It was observed by NI-NTA chromatography that the RSM increases the yield in the expression of rSIP, generating a better purification process. This improvement in rSIP purification suggests a better induction of IgG anti-SIP immune response and a positive effect in the decreased GBS intravaginal colonisation. The RSM applied to optimise the expression of recombinant proteins with immunogenic capacity is an interesting alternative in the evaluation of vaccines in preclinical phase, which could improve their immune response.
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Affiliation(s)
- Diego A Díaz-Dinamarca
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile.,Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Millenium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - José I Jerias
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile
| | - Daniel A Soto
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile
| | - Jorge A Soto
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile.,Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Millenium Institute on Immunology and Immunotherapy, Santiago, Chile
| | - Natalia V Díaz
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile
| | - Yessica Y Leyton
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile
| | - Rodrigo A Villegas
- Departamento de Asuntos Científicos, Instituto de Salud Pública de Chile, Santiago, Chile
| | - Alexis M Kalergis
- Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Millenium Institute on Immunology and Immunotherapy, Santiago, Chile.,Departamento de Endocrinología, Facultad de Medicina Pontificia, Universidad Católica de Chile, Santiago, Chile
| | - Abel E Vásquez
- Sección Biotecnología, Instituto de Salud Pública de Chile, Santiago, Chile. .,Facultad de Ciencia, Universidad San Sebastián, Providencia, Santiago, Chile.
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Agha Amiri S, Zarei N, Enayati S, Azizi M, Khalaj V, Shahhosseini S. Expression Optimization of Anti-CD22 scFv-Apoptin Fusion Protein Using Experimental Design Methodology. IRANIAN BIOMEDICAL JOURNAL 2018; 22:66-9. [PMID: 28689385 PMCID: PMC5712387 DOI: 10.22034/ibj.22.1.66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Background: Design of experiments is a rapid and cost-effective approach for optimization of recombinant protein production process. In our previous study, we generated a potent dual-acting fusion protein, anti-CD22 scFv-apoptin, to target B-cell malignant cell lines. In the present investigation, we report the effect of different variables on the expression levels of this fusion protein. Methods: Four variables (cell optical density at induction, IPTG concentration, induction temperature, and induction time) were tested using experimental design. Results: Our findings demonstrated that among the examined variables, only the induction time had a significant positive effect on the protein expression yield. Conclusion: Experimental design was successfully applied in this study. The optimized condition obtained in the current study can be applied in future commercial production of this novel fusion protein.
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Affiliation(s)
- Solmaz Agha Amiri
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Najmeh Zarei
- Department of Medical Biotechnolgy, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Somayeh Enayati
- Department of Medical Biotechnolgy, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Mohammad Azizi
- Department of Medical Biotechnolgy, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Vahid Khalaj
- Department of Medical Biotechnolgy, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Soraya Shahhosseini
- Department of Pharmaceutical Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Margawati ET, Fuad AM, Indriawati, Ridwan M, Volkandari SD. Optimization of expression JTAT protein with emphasis on transformation efficiency and IPTG concentration. J Genet Eng Biotechnol 2017; 15:515-519. [PMID: 30647694 PMCID: PMC6296586 DOI: 10.1016/j.jgeb.2017.06.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 04/28/2017] [Accepted: 06/10/2017] [Indexed: 11/28/2022]
Abstract
One of small accessory genes between pol and env is tat gene encoding TAT protein. This research was aimed to optimize the expression of Jembrana TAT (JTAT) protein with preparing Escherichia coli (E. coli) in advance using adopted methods of M1 (MgCl2 + CaCl2) and M2 (CaCl2 + Glycerol). The best transformation efficiency resulting from a better transformation method was used to subsequent expression of JTAT protein. A synthetic tat gene encoding protein JTAT was previously cloned into pBT-hisC. Concentration of 200; 400; 600 µM IPTG was induced to a small volume culture (200 ml; OD600 = 4), incubated for 3 h. Pellets were harvested by centrifugation (4000 rpm; 4 °C; 15 min). Buffer B (10 mM Immidazole) was added into pellets, lysed by freeze-thaw followed by sonication. Supernatant was collected by centrifugation (10,000 rpm; 4 °C; 20 min) and purified using Ni-NTA Agarose resin, released by elution buffer (E) containing 400 mM Immidazole to collect purified protein twice (E1, E2). The protein was characterized by SDS-PAGE and Western Blot (WB), quantified (at λ595 nm) with BSA standard method in prior. The result showed that transformation efficiency was better in M2 (2.53 × 106) than M1 (3.10 × 105). The JTAT protein was expressed at a right size of 11.8 kDa. Concentration of 200 µM IPTG produced a significantly better protein yield (1.500 ± 0.089 mg/ml; P < 0.05) than 600 µM IPTG (0.896 ± 0.052 mg/ml) and not different to 400 µM IPTG (1.298 ± 0.080 mg/ml). This research indicated that transformation efficiency needs to be taken account in prior of optimization of the protein expression.
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Affiliation(s)
- Endang Tri Margawati
- Research Center for Biotechnology, The Indonesian Institute of Sciences (LIPI), Jalan Raya Bogor KM. 46, Cibinong 16911, Indonesia
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9
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Soleimani M, Mirmohammad-Sadeghi H, Sadeghi-Aliabadi H, Jahanian-Najafabadi A. Expression and purification of toxic anti-breast cancer p28-NRC chimeric protein. Adv Biomed Res 2016; 5:70. [PMID: 27169101 PMCID: PMC4854029 DOI: 10.4103/2277-9175.180639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Accepted: 10/25/2015] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Chimeric proteins consisting of a targeting moiety and a cytotoxic moiety are now under intense research focus for targeted therapy of cancer. Here, we report cloning, expression, and purification of such a targeted chimeric protein made up of p28 peptide as both targeting and anticancer moiety fused to NRC peptide as a cytotoxic moiety. However, since the antimicrobial activity of the NRC peptide would intervene expression of the chimeric protein in Escherichia coli, we evaluated the effects of two fusion tags, that is, thioredoxin (Trx) and 6x-His tags, and various expression conditions, on the expression of p28-NRC chimeric protein. MATERIALS AND METHODS In order to express the chimeric protein with only 6x-His tag, pET28 expression plasmid was used. Cloning in pET32 expression plasmid was performed to add both Trx and 6x-His tags to the chimeric protein. Expression of the chimeric protein with both plasmids was evaluated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Western blot analysis following optimization of expression conditions and host strains. RESULTS Expression of the chimeric protein in pET28a was performed. However, expression yield of the chimeric protein was low. Optimization of culture conditions and host strains led to reasonable expression yield of the toxic chimeric protein in pET32a vector. In cases of both plasmids, approximately 10 kDa deviation of the apparent molecular weight from the theoretical one was seen in SDS-PAGE of purified chimeric proteins. CONCLUSIONS The study leads to proper expression and purification yield of p28-NRC chimeric protein with Trx tag following optimizing culture conditions and host strains.
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Affiliation(s)
- Meysam Soleimani
- Department of Pharmaceutical Biotechnology, Isfahan University of Medical Sciences, Isfahan, Iran
| | | | - Hojjat Sadeghi-Aliabadi
- Department of Medicinal Chemistry, School of Pharmacy and Pharmaceutical Sciences, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Ali Jahanian-Najafabadi
- Department of Pharmaceutical Biotechnology, Isfahan University of Medical Sciences, Isfahan, Iran
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Khan S, Adhikari DK, Gupta S, Gupta N. High-level expression, purification and characterization of carbazole dioxygenase, a three components dioxygenase, of Pseudomonas GBS.5. Biotechnol Lett 2015; 37:1945-52. [PMID: 26142698 DOI: 10.1007/s10529-015-1876-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 05/26/2015] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To investigate the conversion of carbazole into 2'-aminobiphenyl-2,3-diol using carbazole dioxygenase (CARDO) that is a multicomponent enzyme consisting of homotrimeric terminal oxygenases (CarAa), a ferredoxin (CarAc) and a ferredoxin reductase (CarAd) unit, encoded by the carAa, carAc and carAd genes, respectively. RESULTS The enzyme subunits containing a GST tag were expressed independently in E. coli. The expressed proteins were purified by one-step immobilized affinity chromatography and three purified proteins could reconstitute the CARDO activity in vitro and showed activity against carbazole as well as against wide range of polyaromatic compounds. CONCLUSION This method provides an efficient way to obtain an active carbazole dioxygenase with high yield, high purity and with activity against a wide range of polyaromatic compounds.
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Affiliation(s)
- Samiya Khan
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, 201301, U.P., India
| | - D K Adhikari
- Biofuels Division & HOA Biotechnology Conversion Area, Indian Institute of Petroleum, Mohkampur, Dehradun, 248005, India
| | - Sanjay Gupta
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, 201301, U.P., India
| | - Nidhi Gupta
- Department of Biotechnology, Jaypee Institute of Information Technology, A-10, Sector-62, Noida, 201301, U.P., India.
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Larentis AL, Nicolau JFMQ, Esteves GDS, Vareschini DT, de Almeida FVR, dos Reis MG, Galler R, Medeiros MA. Evaluation of pre-induction temperature, cell growth at induction and IPTG concentration on the expression of a leptospiral protein in E. coli using shaking flasks and microbioreactor. BMC Res Notes 2014; 7:671. [PMID: 25252618 PMCID: PMC4190419 DOI: 10.1186/1756-0500-7-671] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 08/27/2014] [Indexed: 11/23/2022] Open
Abstract
Background Leptospirosis is a zoonose that is increasingly endemic in built-up areas, especially where there are communities living in precarious housing with poor or non-existent sanitation infrastructure. Leptospirosis can kill, for its symptoms are easily confused with those of other diseases. As such, a rapid diagnosis is required so it can be treated effectively. A test for leptospirosis diagnosis using Leptospira Immunoglobulin-like (Lig) proteins is currently at final validation at Fiocruz. Results In this work, the process for expression of LigB (131-645aa) in E. coli BL21 (DE3)Star™/pAE was evaluated. No significant difference was found for the experiments at two different pre-induction temperatures (28°C and 37°C). Then, the strain was cultivated at 37°C until IPTG addition, followed by induction at 28°C, thereby reducing the overall process time. Under this condition, expression was assessed using central composite design for two variables: cell growth at which LigB (131-645aa) was induced (absorbance at 600 nm between 0.75 and 2.0) and inducer concentration (0.1 mM to 1 mM IPTG). Both variables influenced cell growth and protein expression. Induction at the final exponential growth phase in shaking flasks with Absind
= 2.0 yielded higher cell concentrations and LigB (131-645aa) productivities. IPTG concentration had a negative effect and could be ten-fold lower than the concentration commonly used in molecular biology (1 mM), while keeping expression at similar levels and inducing less damage to cell growth. The expression of LigB (131-645aa) was associated with cell growth. The induction at the end of the exponential phase using 0.1 mM IPTG at 28°C for 4 h was also performed in microbioreactors, reaching higher cell densities and 970 mg/L protein. LigB (131-645aa) was purified by nickel affinity chromatography with 91% homogeneity. Conclusions It was possible to assess the effects and interactions of the induction variables on the expression of soluble LigB (131-645aa) using experimental design, with a view to improving process productivity and reducing the production costs of a rapid test for leptospirosis diagnosis.
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Affiliation(s)
- Ariane Leites Larentis
- Fiocruz, Bio-Manguinhos, Vice Directory of Technological Development, Laboratory of Recombinant Technologies (LATER), Av, Brasil 4365, Manguinhos, Rio de Janeiro, RJ 21,040-360, Brazil.
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12
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Marini G, Luchese MD, Argondizzo APC, de Góes ACMA, Galler R, Alves TLM, Medeiros MA, Larentis AL. Experimental design approach in recombinant protein expression: determining medium composition and induction conditions for expression of pneumolysin from Streptococcus pneumoniae in Escherichia coli and preliminary purification process. BMC Biotechnol 2014; 14:1. [PMID: 24400649 PMCID: PMC3897902 DOI: 10.1186/1472-6750-14-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 12/16/2013] [Indexed: 11/21/2022] Open
Abstract
Background Streptococcus pneumoniae (S. pneumoniae) causes several serious diseases including pneumonia, septicemia and meningitis. The World Health Organization estimates that streptococcal pneumonia is the cause of approximately 1.9 million deaths of children under five years of age each year. The large number of serotypes underlying the disease spectrum, which would be reflected in the high production cost of a commercial vaccine effective to protect against all of them and the higher level of amino acid sequence conservation as compared to polysaccharide structure, has prompted us to attempt to use conserved proteins for the development of a simpler vaccine. One of the most prominent proteins is pneumolysin (Ply), present in almost all the serotypes known at the moment, which shows an effective protection against S. pneumoniae infections. Results We have cloned the pneumolysin gene from S. pneumoniae serotype 14 and studied the effects of eight variables related to medium composition and induction conditions on the soluble expression of rPly in Escherichia coli (E. coli) and a 28-4 factorial design was applied. Statistical analysis was carried out to compare the conditions used to evaluate the expression of soluble pneumolysin; rPly activity was evaluated by hemolytic activity assay and served as the main response to evaluate the proper protein expression and folding. The optimized conditions, validated by the use of triplicates, include growth until an absorbance of 0.8 (measured at 600 nm) with 0.1 mM IPTG during 4 h at 25°C in a 5 g/L yeast extract, 5 g/L tryptone, 10 g/L NaCl, 1 g/L glucose medium, with addition of 30 μg/mL kanamycin. Conclusions This experimental design methodology allowed the development of an adequate process condition to attain high levels (250 mg/L) of soluble expression of functional rPly in E. coli, which should contribute to reduce operational costs. It was possible to recover the protein in its active form with 75% homogeneity.
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Affiliation(s)
- Guillermo Marini
- Bio-Manguinhos (Instituto de Tecnologia em Imunobiológicos) - Fundação Oswaldo Cruz (FIOCRUZ) - VDTEC (Vice-Diretoria de Desenvolvimento Tecnológico), Av, Brasil 4365, Pavilhão Rockfeller Sala 202 - 21040-360, Manguinhos, Rio de Janeiro, RJ, Brazil.
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