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[Lambda plasmidophages and their properties].

A A Mel'nikov, A P Chernov, I I Fodor

    Molekuliarnaia Biologiia
    |May 1, 1985
    PubMed
    Summary
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    Researchers created a hybrid plasmid-phage DNA molecule, lambda NM::pBR322. This DNA can switch between phage development and plasmid replication, offering new insights into genetic engineering and molecular biology.

    Area of Science:

    • Molecular Biology
    • Genetic Engineering
    • Virology

    Background:

    • Hybrid DNA molecules combining plasmid and phage elements offer unique biological properties.
    • Understanding the behavior of such constructs is crucial for developing novel biotechnological tools.

    Purpose of the Study:

    • To construct and characterize a novel hybrid plasmid-phage DNA molecule, lambda NM::pBR322.
    • To compare its properties with previously developed constructs like lambda gt::pMB9.
    • To investigate the conditional replication and excision capabilities of the hybrid DNA.

    Main Methods:

    • In vitro construction of the hybrid plasmid-phage DNA molecule.
    • Characterization of its biological behavior under varying conditions (normal vs. antibiotic presence).

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  • Comparative analysis with existing lambda-plasmid hybrids.

    • Main Results:

    • The lambda NM::pBR322 hybrid DNA molecule was successfully constructed and characterized.
    • Under normal conditions, it follows a lytic cycle of phage development.
    • In the presence of antibiotics, lambda DNA replicates extrachromosomally as a plasmid.
    • Precise in vivo excision of plasmid pMB9 from lambda gt::pMB9 was demonstrated.

    Conclusions:

    • The lambda NM::pBR322 hybrid exhibits conditional replication, acting as either a phage or a plasmid.
    • This dual functionality provides a versatile system for genetic manipulation.
    • The precise excision capability from related constructs highlights the potential for controlled genetic element transfer.