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[New cloning vectors constructed in Bacillus].

M Qiao, B Cai, C Gao

    Yi Chuan Xue Bao = Acta Genetica Sinica
    |January 1, 1989
    PubMed
    Summary
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    Two novel Bacillus plasmids, pNQ216 and pNQ402, were engineered using a B. pumilus replication origin and the cat-86 gene. These stable cloning vectors show improved chloramphenicol resistance in Bacillus species.

    Area of Science:

    • Molecular Biology
    • Microbial Genetics
    • Biotechnology

    Background:

    • Plasmids are essential tools for genetic manipulation in bacteria.
    • Existing cloning vectors in Bacillus species have limitations in stability and efficiency.
    • Development of novel vectors is crucial for advancing Bacillus-based biotechnology.

    Purpose of the Study:

    • To construct and characterize two new plasmids, pNQ216 and pNQ402, for use as cloning vectors in Bacillus.
    • To evaluate the stability and expression of the cat-86 gene in these novel plasmids.
    • To compare the performance of the new plasmids with existing vectors.

    Main Methods:

    • Construction of pNQ216 and pNQ402 by combining the replication origin of Bacillus pumilus 289 cryptic plasmid pNK289 with the cat-86 gene from pPL601.

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  • Transformation of Bacillus subtilis and Bacillus pumilus with the constructed plasmids.
  • Assessment of plasmid stability and chloramphenicol resistance (Cm) penetrance on LB medium.

    • Main Results:

    • Successfully constructed pNQ216 (4.1 kb) and pNQ402 (2.8 kb).
    • Both plasmids demonstrated stable maintenance in Bacillus subtilis and Bacillus pumilus.
    • The new plasmids exhibited a 30% higher Cm penetrance compared to pPL600 on LB medium with 20 µg/ml Cm.

    Conclusions:

    • The novel plasmids pNQ216 and pNQ402 are stable and efficient cloning vectors for Bacillus species.
    • These vectors offer improved performance, particularly in chloramphenicol resistance, over existing options.
    • pNQ216 and pNQ402 represent valuable additions to the toolkit for genetic engineering in Bacillus.