Characteristics and Purification of PRR1, an RNA Phage Specific for the Broad Host Range Pseudomonas R1822 Drug Resistance Plasmid

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Abstract
A new drug resistance plasmid-dependent RNA containing phage resembling coliphage f2 in its particle size and density is described. The phage, PRR1, will only productively infect some R(+) hosts containing the Pseudomonas drug resistance plasmid R1822. The membrane filter-salt elution patterns, RNase sensitivity, inactivation in low ionic strength solutions, and host range serve to distinguish PRR1 from coliphage f2 and two other Pseudomonas RNA phages, 7s and PP7.