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A promoter for Bacillus subtilis expression vector.

K Nakahama, T Miyazaki, M Kikuchi

    Gene
    |January 1, 1985
    PubMed
    Summary
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    Researchers identified a strong Bacillus subtilis promoter (P1) that can drive the expression of human interleukin-2 (IL-2) and human interferon-gamma (IFN-gamma) genes in bacteria.

    Area of Science:

    • Molecular Biology
    • Microbial Genetics
    • Biotechnology

    Background:

    • Bacillus subtilis is a well-characterized bacterium used extensively in industrial applications.
    • Efficient expression systems are crucial for producing recombinant proteins, including therapeutic agents.
    • Identifying novel bacterial promoters is key to developing advanced genetic engineering tools.

    Purpose of the Study:

    • To isolate and characterize a novel promoter from Bacillus subtilis with strong transcriptional activity.
    • To evaluate the functionality of the identified promoter in driving the expression of heterologous genes.

    Main Methods:

    • Cloning of a 117-bp DNA fragment containing the P1 promoter from Bacillus subtilis chromosomal DNA.
    • DNA sequencing to identify promoter elements (-35 and -10 regions).

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  • Gene expression analysis by cloning and expressing human interleukin-2 (IL-2) and human interferon-gamma (IFN-gamma) genes under the control of the P1 promoter in B. subtilis.

    • Main Results:

    • A 117-bp fragment with strong promoter activity, designated P1, was successfully cloned and sequenced.
    • The P1 promoter contains a putative -35 region (TTTACT) and -10 region (TAGATT).
    • The P1 promoter effectively promoted the expression of cloned human IL-2 and IFN-gamma genes in Bacillus subtilis.

    Conclusions:

    • The identified P1 promoter from Bacillus subtilis exhibits significant strength and is suitable for driving gene expression.
    • This promoter can be a valuable tool for the heterologous expression of human therapeutic proteins like IL-2 and IFN-gamma in microbial systems.
    • The characterization of the P1 promoter expands the toolkit for genetic manipulation and protein production in Bacillus subtilis.