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Related Experiment Videos

Versatile cloning vectors derived from the runaway-replication plasmid pKN402.

M Bittner, D Vapnek

    Gene
    |December 1, 1981
    PubMed
    Summary

    Researchers developed two new cloning vectors, pMOB45 and pMOB48, using plasmid R1 mutants. These vectors allow high-level DNA and protein production via heat induction, enabling efficient gene cloning and expression.

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    Area of Science:

    • Molecular Biology
    • Genetic Engineering
    • Biotechnology

    Background:

    • Plasmid R1 runaway-replication mutants offer potential for high-copy-number DNA production.
    • Existing cloning vectors may have limitations in amplification and inducible expression.

    Purpose of the Study:

    • To construct novel cloning vectors based on R1 plasmid runaway-replication mutants.
    • To enable high-level DNA and protein production for gene cloning and expression.

    Main Methods:

    • Construction of two plasmids, pMOB45 and pMOB48, utilizing R1 runaway-replication mutants.
    • Incorporation of antibiotic resistance genes (tetracycline, chloramphenicol) and lac operon elements.
    • Utilizing heat induction for plasmid amplification and IPTG for gene expression.

    Main Results:

    • Both pMOB45 and pMOB48 achieve high-level plasmid amplification through heat induction without inhibiting protein synthesis.
    • pMOB48 features a BamHI site within the lacPOZ operon for creating protein fusions.
    • Chimeric proteins fused to beta-galactosidase can be detected using X-gal and expressed at extremely high levels.

    Conclusions:

    • The developed cloning vectors facilitate efficient, high-level production of plasmid DNA and cloned proteins.
    • pMOB48 serves as a versatile tool for lac-controlled expression of fused proteins.
    • These vectors are valuable for applications requiring large quantities of specific proteins.

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