Formation of .LAMBDA. transducing phage in vitro: Involvement of DNA gyrase.

J-STAGE
  • Tomono Masahiro
    Department of Molecular Biology, The Institute of Medical Science, The University of Tokyo
  • Shiozaki Makoto
    Department of Molecular Biology, The Institute of Medical Science, The University of Tokyo
  • Ikeda Hideo
    Department of Molecular Biology, The Institute of Medical Science, The University of Tokyo

抄録

We found that transducing phages carrying the gal or bio regions of the Escherichia coli genome were formed during in vitro packaging of endogenous λ DNA. Structural analysis of the transducing phage genomes indicated that they were formed by abnormal excision of λ prophage. Formation of transducing phages was stimulated by oxolinic acid, an inhibitor of DNA gyrase, implying that DNA gyrase participates in the abnormal excision of λ prophage. When pBR322 DNA was added to the reaction mixture, transducing phages into which pBR322 had been inserted were produced at a high frequency. This reaction was also stimulated by oxolinic acid. Sequence analyses revealed that pBR322 is inserted into the sites of abnormal excision of the prophage. These results show that transducing phages can be formed by DNA gyrase-dependent illegitimate recombination in an in vitro system and that secondary recombination takes place frequently at the site where the first recombina-tion occurs.

収録刊行物

詳細情報 詳細情報について

問題の指摘

ページトップへ