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Achromobacter sp. 2 Phage 3: A Physical Characterization

MRC Unit for Microbial Genetics, University of Pretoria, P.O. Box 2034, Pretoria, 0001, Republic of South Africa

Phage 3 had a buoyant density of 1#x00B7;506 g/ml, suggesting a protein capsid. The mol. wt. of the phage genome was 34 ± 1 x 10⁶. A dual genome population was observed and partial denaturation, duplex and restriction analyses facilitated distinction between constituent phages, 3 and 3. Phage 3 exhibited a 0.7 ± 0#x00B7;2 x 10⁶ mol. wt. deletion in its genome with respect to 3. Both phages were encapsulated by a headful mechanism and the genomes were permuted over 27% and <18% of their length respectively. It is concluded that stable variants may be isolated and that these phages offer potential, through physical studies, to elucidate the properties of the Achromobacter-3 system.

Received 22 July 1980; accepted 14 November 1980.