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Published on: November 16, 2016
Secretion of human interferon-beta 1b by recombinant Lactococcus lactis
Zhong Zhuang1, Zhi-Gang Wu, Min Chen
1State Key Laboratory of Microbial Technology, Shandong University, Jinan, Shandong 250100, People's Republic of China.
Recombinant human interferon-beta (huIFN-beta) was successfully produced in Lactococcus lactis. This food-grade bacterium can deliver bioactive huIFN-beta for potential therapeutic applications in inflammatory disorders.
Area of Science:
- Biotechnology
- Microbiology
- Immunology
Background:
- Interferon-beta (IFN-β) exhibits antiviral, antiproliferative, and immunomodulatory properties, showing therapeutic potential for inflammatory conditions.
- Developing efficient and safe production systems for therapeutic proteins is crucial for their clinical application.
Purpose of the Study:
- To express and secrete recombinant human interferon-beta (huIFN-beta) in the food-grade bacterium Lactococcus lactis.
- To evaluate the production yield, secretion efficiency, and biological activity of the expressed huIFN-beta.
Main Methods:
- Utilized a nisin-controlled gene expression system in Lactococcus lactis to produce huIFN-beta.
- Compared production levels and secretion efficiency between strains with and without a specific propeptide.
- Assessed the antiviral activity of the secreted huIFN-beta.
Main Results:
- Achieved huIFN-beta production of approximately 21 µg/L and 7 µg/L in strains with and without the LEISSTCDA propeptide, respectively.
- Demonstrated high secretion efficiency, with 95% and 88% of total recombinant proteins secreted into the culture medium.
- Confirmed comparable antiviral activities of 10^7 IU/mg for huIFN-beta from both recombinant strains.
Conclusions:
- Lactococcus lactis can serve as an effective food-grade vehicle for producing and delivering bioactive huIFN-beta.
- The nisin-controlled expression system facilitates high-level secretion of functional huIFN-beta.
- These findings support the potential use of engineered Lactococcus lactis for in vivo delivery of therapeutic interferon-beta.
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