Transfection of Escherichia coli and Salmonella typhimurium spheroplasts: host-controlled restriction of infective bacteriophage P22 deoxyribonucleic acid.


Under proper conditions, one infective center was obtained for 3 x 10(8) molecules of P22 phage deoxyribonucleic acid (DNA) when lysozyme-ethylenediaminetetraacetic acid spheroplasts of Escherichia coli were transfected in the presence of 25 mug of protamine sulfate per ml. A 3- to 50-fold B-specific and K-specific E. coli restriction of the incoming P22… (More)

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