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Appl Environ Microbiol. 1990 July; 56(7): 2180-2185

Taxonomic differentiation of 101 lactococcal bacteriophages and characterization of bacteriophages with unusually large genomes.

Centre de Recherche de Biochimie et de Génétique Cellulaire, CTBM-INSA, Toulouse, France.

ABSTRACT

Sixty-three virulent bacteriophages of Lactococcus lactis were differentiated by DNA-DNA hybridization. The results, including those of a previous classification of 38 phages of the same bacterial species (P. Relano, M. Mata, M. Bonneau, and P. Ritzenthaler, J. Gen. Microbiol. 133:3053-3063, 1987) show that 48% of the phages analyzed belong to a unique DNA homology group (group III). Phages of this most abundant group had small isometric heads. Group I comprised 29% of the phages analyzed and was characterized by a small phage genome (19 to 22 kilobases) and a particular morphology with a prolate head. Like group III, this group contained representative phages of other classifications. Group II (21%) included virulent and temperate phages with small isometric heads. Two large isometric-headed phages, phi 109 and phi 111, were not related to the three DNA homology groups I, II, and III. The genome of phi 111 was unusually large (134 kilobases) and revealed partial DNA homology with another large isometric phage, 1289, described by Jarvis (type e) (A. W. Jarvis, Appl. Environ. Microbiol. 47:343-349, 1984). The protein compositions of phi 111 and 1289 were similar (three common major proteins of 21, 28, and 32 kilodaltons).

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