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Bacteriophages PRDI (Olsen, Siak & Gray, 1974) and PR4 (Stanisich, 1974; Bradley & Rutherford, 1975) belong to a group of lipid-containing viruses which lyse bacteria harbouring any drug resistance plasmid within the incompatibility groups P-I (originally P, see Shahrabadi, Bryan & Van Den Elzen, 1975; Jacoby, 1977), N or W. The morphologically identical viruses possess a 65 nm diameter head, which is probably icosahedral, and a 60 nm tail, originally thought to be absent on PRDI (Olsen et al., 1974). Until recently, both phages were believed to adsorb only to cell-wall receptors, and not to plasmid-determined pili (Olsen et al., 1974; Bradley, 1974). The chemical nature of a somatic receptor determined by RPI, a P-I group plasmid, has been described by Olsen, Siak & Shipley (1977). However, Bradley (1976) has shown that PR4 adsorbs to the tips of pili determined by W incornpatibility group plasmids. In view of this, it was considered possible that previous failures to observe lipid phage virions adsorbed to pili determined by P-I plasmids (P-I pili) was due to the adverse effects of the electron microscope specimen preparation process used. The present communication describes the results of a different technical approach, and discusses the nature of the lipid phage receptor.

Adsorption of Lipid-containing Bacteriophages PR4 and PRD1 to Pili Determined by a P-1 Incompatibility Group Plasmid