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  • Title: High-frequency conjugal plasmid transfer from gram-negative Escherichia coli to various gram-positive coryneform bacteria.
    Author: Schäfer A, Kalinowski J, Simon R, Seep-Feldhaus AH, Pühler A.
    Journal: J Bacteriol; 1990 Mar; 172(3):1663-6. PubMed ID: 2106514.
    Abstract:
    We report on the mobilization of shuttle plasmids from gram-negative Escherichia coli to gram-positive corynebacteria mediated by P-type transfer functions. Introduction of plasmids into corynebacteria was markedly enhanced after heat treatment of the recipient cells. High-frequency plasmid transfer was also observed when the restriction system of the recipient was mutated. On the basis of our data, we conclude that efficient DNA transfer from gram-negative to gram-positive bacteria, at least to coryneform bacteria, is conceivable in certain natural ecosystems.
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