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Hosseini ES, Zeinoddini M, Saeedinia AR, Babaeipour V. Optimization and One-Step Purification of Recombinant V Antigen Production from Yersinia pestis. Mol Biotechnol 2020; 62:177-184. [PMID: 31894514 PMCID: PMC7222043 DOI: 10.1007/s12033-019-00234-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
The purpose of this study was to develop an efficient and inexpensive method for the useful production of recombinant protein V antigen, an important virulence factor for Yersinia pestis. To this end, the synthetic gene encoding the V antigen was subcloned into the downstream of the intein (INT) and chitin-binding domain (CBD) from the pTXB1 vector using specific primers. In the following, the produced new plasmid, pTX-V, was transformed into E. coli ER2566 strain, and the expression accuracy was confirmed using electrophoresis and Western blotting. In addition, the effects of medium, inducer, and temperature on the enhancement of protein production were studied using the Taguchi method. Finally, the V antigen was purified by a chitin affinity column using INT and CBD tag. The expression was induced by 0.05 mM IPTG at 25 °C under optimal conditions including TB medium. It was observed that the expression of the V-INT–CBD fusion protein was successfully increased to more than 40% of the total protein. The purity of V antigen was as high as 90%. This result indicates that V antigen can be produced at low cost and subjected to one-step purification using a self-cleaving INT tag.
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Affiliation(s)
- Elahe Seyed Hosseini
- Faculty of Chemistry and Chemical Engineering, Malek Ashtar University of Technology, Tehran, Iran.,Gametogenesis Research Center, Kashan University of Medical Sciences, Kashan, Iran
| | - Mehdi Zeinoddini
- Faculty of Chemistry and Chemical Engineering, Malek Ashtar University of Technology, Tehran, Iran. .,Gametogenesis Research Center, Kashan University of Medical Sciences, Kashan, Iran.
| | - Ali Reza Saeedinia
- Gametogenesis Research Center, Kashan University of Medical Sciences, Kashan, Iran
| | - Valiollah Babaeipour
- Gametogenesis Research Center, Kashan University of Medical Sciences, Kashan, Iran
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Bowen W, Batra L, Pulsifer AR, Yolcu ES, Lawrenz MB, Shirwan H. Robust Th1 cellular and humoral responses generated by the Yersinia pestis rF1-V subunit vaccine formulated to contain an agonist of the CD137 pathway do not translate into increased protection against pneumonic plague. Vaccine 2019; 37:5708-5716. [PMID: 31416643 DOI: 10.1016/j.vaccine.2019.07.103] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/19/2019] [Accepted: 07/21/2019] [Indexed: 10/26/2022]
Abstract
Yersinia pestis is the causative agent of plague and is a re-emerging pathogen that also has the potential as a biological weapon, necessitating the development of a preventive vaccine. Despite intense efforts for the last several decades, there is currently not a vaccine approved by the FDA. The rF1-V vaccine adjuvanted with Alhydrogel is a lead candidate subunit vaccine for plague and generates a strong Th2-mediate humoral response with a modest Th1 cellular response. As immune protection against Y. pestis requires both humoral and Th1 cellular responses, modifying the rF1-V subunit vaccine formulation to include a robust inducer of Th1 responses may improve efficacy. Thus, we reformulated the subunit vaccine to include SA-4-1BBL, an agonist of the CD137 costimulatory pathway and a potent inducer of Th1 response, and assessed its protective efficacy against pneumonic plague. We herein show for the first time a sex bias in the prophylactic efficacy of the Alhydrogel adjuvanted rF1-V vaccine, with female mice showing better protection against pneumonic plague than male. The sex bias for protection was irrespective of the generation of comparable levels of rF1-V-specific antibody titers and Th1 cellular responses in both sexes. The subunit vaccine reformulated with SA-4-1BBL generated robust Th1 cellular and humoral responses. A prime-boost vaccination scheme involving prime with rF1-V + Alhydrogel and boost with the rF1-V + SA-4-1BBL provided protection in male mice against pneumonic plague. In marked contrast, prime and boost with rF1-V reformulated with both adjuvants resulted in the loss of protection against pneumonic plague, despite generating high levels of humoral and Th1 cellular responses. While unexpected, these findings demonstrate the complexity of immune mechanisms required for protection. Elucidating mechanisms responsible for these differences in protection will help to guide the development of better prophylactic subunit vaccines effective against pneumonic plague.
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Affiliation(s)
- William Bowen
- Institute for Cellular Therapeutics, University of Louisville, Louisville, KY 40202, United States; FasCure Therapeutics, LLC, Louisville, KY 40202, United States
| | - Lalit Batra
- Institute for Cellular Therapeutics, University of Louisville, Louisville, KY 40202, United States
| | - Amanda R Pulsifer
- Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, United States
| | - Esma S Yolcu
- Institute for Cellular Therapeutics, University of Louisville, Louisville, KY 40202, United States; Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, United States
| | - Matthew B Lawrenz
- Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, United States; The Center for Predictive Medicine for Biodefense and Emerging Infectious Diseases, University of Louisville, Louisville, KY 40202, United States.
| | - Haval Shirwan
- Institute for Cellular Therapeutics, University of Louisville, Louisville, KY 40202, United States; Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, United States.
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