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Ribeiro VT, Asevedo EA, de Paiva Vasconcelos LTC, Filho MAO, de Araújo JS, de Macedo GR, de Sousa Júnior FC, Dos Santos ES. Evaluation of induction conditions for plasmid pQE-30 stability and 503 antigen of Leishmania i. chagasi expression in E. coli M15. Appl Microbiol Biotechnol 2019; 103:6495-6504. [PMID: 31218376 DOI: 10.1007/s00253-019-09948-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/23/2019] [Accepted: 05/28/2019] [Indexed: 11/29/2022]
Abstract
The present study aimed to evaluate the influence of induction conditions (IPTG concentration, temperature, and induction time) on the plasmid pQE-30 stability and 503 antigen expression of Leishmania i. chagasi in Escherichia coli M15. Batch cultures were performed at 37 °C and induced by the addition of different IPTG concentrations (0.01 to 1.5 mM). Subsequently, experiments were carried out at different temperatures (27 to 42 °C), evaluating the influence of induction time (0.5 to 6 h after the start of the culture). The results showed that IPTG toxicity caused a metabolic stress in the cells and, consequently, the microorganism growth reduced. The induction with IPTG may also be associated with the plasmid pQE-30 instability, due to metabolic burden imposed by the recombinant protein expression. The optimal conditions for 503 antigen expression of Leishmania i. chagasi in Escherichia coli M15 were an IPTG concentration of 1.0 mM, temperature of 37 °C, and induction time of 2 h. The maximum antigen concentration obtained was 0.119 ± 0.009 g/L, about seven times higher than the lowest concentration. Therefore, the results showed that 503 antigen can be produced in laboratory; however, it requires more studies to minimize the plasmid instability and improve to industrial scale.
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Affiliation(s)
- Vitor Troccoli Ribeiro
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Estéfani Alves Asevedo
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Luan Tales Costa de Paiva Vasconcelos
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Marcos Antônio Oliveira Filho
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Jaciara Silva de Araújo
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Gorete Ribeiro de Macedo
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil
| | - Francisco Canindé de Sousa Júnior
- Pharmacy Department, Universidade Federal do Rio Grande do Norte, R. Gen. Gustavo Cordeiro de Faria, Natal, Rio Grande do Norte, 59012-570, Brazil
| | - Everaldo Silvino Dos Santos
- Chemical Engineering Department, Universidade Federal do Rio Grande do Norte, Av. Sen. Salgado Filho, 3000, Natal, Rio Grande do Norte, 59078-970, Brazil.
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van Belkum MJ, Vederas JC. The ABC Transporter CclEFGH Facilitates the Production of the Circular Bacteriocin Carnocyclin A. Probiotics Antimicrob Proteins 2012; 4:273-8. [DOI: 10.1007/s12602-012-9112-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Crutz-Le Coq AM, Zagorec M. Vectors for Lactobacilli and other Gram-positive bacteria based on the minimal replicon of pRV500 from Lactobacillus sakei. Plasmid 2008; 60:212-20. [PMID: 18789962 DOI: 10.1016/j.plasmid.2008.08.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2008] [Revised: 08/02/2008] [Accepted: 08/08/2008] [Indexed: 11/17/2022]
Abstract
The low-copy-number plasmid pRV500, belonging to the pUCL287 group of theta-type plasmids, was previously isolated from Lactobacillus sakei and characterized. We show here that the replicon of this plasmid enables replication also in Enterococcus faecalis and Bacillus subtilis but not in Lactococcus lactis. A 1.25 kb region encompassing the iterons and the repA gene was sufficient for replication, copy-number control and relative stable maintenance in L. sakei. Functional implications of host or plasmid-borne factors in the maintenance of pUCL287-type plasmids are discussed. The minimal replicon from pRV500 was fused to pBluescript for constructing the shuttle E. coli/lactobacilli cloning vector pRV610. pRV610 enables the white/blue lacZ alpha-complementation in E. coli. The cassettes for selection (erythromycin resistance) and replication (iterons and repA gene) are each bordered by unique restriction sites for easy replacement if needed. Derivatives in which chloramphenicol or tetracycline resistance replaced erythromycin resistance were constructed. In order to allow inducible gene expression, a copper-inducible promoter was placed on the pRV613 derivative. Expression of the downstream reporter gene lacZ was shown to be induced by 30 microM CuSO(4).
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Affiliation(s)
- Anne-Marie Crutz-Le Coq
- Unité Flore Lactique et Environnement Carné, UR309, Institut National de la Recherche Agronomique, INRA, 78350 Jouy-en-Josas, France.
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