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A library of bacteriophage P1 DNA was constructed in the phage vector lambda D69. The DNA of some 150 randomly chosen lambda-P1 hybrid phages containing P1 DNA fragments 5-10 kb in size was analyzed by restriction endonuclease digestion using enzymes EcoRI, BglII, and BamHI that cleave P1 DNA at known positions on the physical map of P1. Approximately one third of the phages contained P1 DNA inserts having two or more restriction sites for any one of these enzymes, thus allowing the location of the insert to be determined with respect to the physical map. Genetic tests allowed detection of lambda-P1 hybrid phages possessing inserts with functional P1 ban and CmR genes. A subset of 18 phages was analyzed in more detail; their P1 DNA inserts comprise an ordered collection of overlapping P1 DNA fragments that cover almost 98% of the P1 genome.
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