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Updated: Jan 16, 2026
Enrichment of Native and Recombinant Extracellular Vesicles of Mycobacteria
Published on: December 8, 2023
Expression of a Tuberculosis-Associated Immunogenic Protein in Escherichia coli
Gizem Kılıç1, Burcu Saygıner1, Muhammed Yusuf Yılmaz1
1Department of Medical Biotechnology, Institute of Health Sciences, Acibadem University, 34752 İstanbul, Türkiye.
Abstract:
It is estimated that one in four people worldwide carries Mycobacterium tuberculosis bacteria. MPT64 is a protein exclusively secreted by Mycobacterium tuberculosis complex (MTC) bacteria. It serves as a crucial diagnostic marker and plays a role in the bacterium's survival by modulating the host immune response. Consequently, the development of innovative diagnostic tools based on MPT64, as well as the production of high-purity MPT64 protein to support research on tuberculosis pathogenesis and the advancement of novel therapeutic strategies, is of great importance. In this study, optimization experiments were conducted to produce this protein in E. coli with high yield and purity. First, a gBlock was designed by codon optimization and then cloned into a plasmid vector using the LIC method. For more efficient production, E. coli BL21(DE3)-R3-pRARE2 strain, which carries rare tRNAs for rare codons, was used as the host. Five different culture media were tested to maximize protein production, with the highest yield obtained in eBHI medium. The resulting protein yield was 4.9 mg/L. To the best of our knowledge, this study provides the most detailed information on the recombinant production and characterization of MPT64 to date. Therefore, these results contribute important data for future studies on the MPT64 protein.
Insights
Researchers optimized the production of MPT64 protein from Mycobacterium tuberculosis complex (MTC) in E. coli. This high-purity recombinant MPT64 protein is vital for developing new tuberculosis diagnostics and therapeutics.
Area of Science:
- Molecular Biology
- Biotechnology
- Microbiology
Background:
- Mycobacterium tuberculosis (M.tb) infects one in four people globally.
- MPT64 protein is exclusively secreted by M. tuberculosis complex (MTC) bacteria.
- MPT64 is a key diagnostic marker and influences host immune response for M.tb survival.
Purpose of the Study:
- To optimize recombinant production of MPT64 protein in E. coli for high yield and purity.
- To facilitate the development of novel tuberculosis diagnostic tools.
- To support research on tuberculosis pathogenesis and novel therapeutic strategies.
Main Methods:
- Codon optimization of MPT64 gene sequence and cloning into a plasmid vector using LIC method.
- Expression in E. coli BL21(DE3)-R3-pRARE2 strain for enhanced production of rare codons.
- Screening of five different culture media to maximize protein yield, identifying eBHI medium.
Main Results:
- Achieved a high yield of 4.9 mg/L of MPT64 protein.
- Demonstrated high purity of the recombinant MPT64 protein.
- Provided detailed information on recombinant MPT64 production and characterization.
Conclusions:
- Successfully optimized a cost-effective method for high-yield, high-purity MPT64 recombinant protein production.
- The produced MPT64 protein is suitable for research and development of new tuberculosis diagnostics and therapies.
- This study offers valuable data for future investigations into MPT64's role in M.tb pathogenesis and treatment.
