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Altered Phage P1 Attachment to Strains of Escherichia Coli Carrying the Plasmid ColV,I-K94

Department of Botany and Microbiology, University College London, Gower Street, London WC1E 6BT, U.K.

Phages P1vir and P1cmclr100 failed to form plaques on or multiply in Escherichia coli strains carrying the ColV,I-K94 plasmid; with P1cmclr100, the effect occurred both with phage from the lytic cycle and with that induced from a lysogen. The effect was on attachment, these P1 phages attaching poorly to ColV,I-K94⁺ strains. This receptor defect appeared to result mainly from the presence of ColV-encoded transfer and colicin components in the cells carrying ColV,I-K94 and it was specific to this plasmid. Phage Mu (which uses an attachment mechanism similar to that of phage P1) in the G(+) form attached to both Col^- and ColV,I-K94⁺ strains but the G(-) form attached to neither type.

Keywords: ColV,I-K94 plasmid, phage P1, attachment

Received 30 January 1987; accepted 18 March 1987.