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Proteus mirabilis Phages 5006M, 5006M HFT k and 5006M HFT ak: Physical Comparison of Genome Characteristics

MRC Unit for Microbial Genetics, University of Pretoria, PO Box 2034, Pretoria 0001, Republic of South Africa

The genomes of Proteus mirabilis phages 5006M, kanamycin resistance transducing variant 5006 M HFT k and kanamycin-ampicillin resistance transducing variant 5006M HFT ak have been compared. Homo- and heteroduplex and partial denaturation mapping analyses were performed. The results confirm a sequential headful packaging mechanism, facilitate mapping of the ampicillin resistance marker, demonstrate a hairpin loop structure in both variants, reveal a common insertion site for 8 to 9 x 10⁶ mol. wt. non-phage DNA in both variants and implicate a role for the non-inducible cryptic host strain prophage 5006M in the generation cycle of the variant phages.

Received 29 October 1979; accepted 23 January 1980.