Characterization of a phage infecting Propionibacterium freudenreichii

Bacteriophage 822 was isolated from a Swiss-type cheese. Out of 30 strains of Propionibacterium freudenieichii, only the strain TL 110 was sensitive to this phage. 822 morphology is very similar to those of phages infecting P acnes. It has an' isometric head, a non-contractile tal and a tail plate, so it belongs to the 81 group of 8radley's classifiCation. The 822 genome consists of a Iinear double-stranded DNA molecule 40 kb long with cohsive ends. ". bacteriophage 1 Propionibacterium freudenrichii 1cheese Rsum -Caractrisation d'un bactriophage infectant Propionibacterium freudenreichii. Le bactriophage B22 a t isol partir d'un fromage pte presse cuite. 1/ n'infecte qu'une souche (TL 110) sur les 30 souches de Propionibacterium freudenreichii testes. Morphologiquement, B22 ressemble beaucoup aux phages infectant P acnes. Sa tte est un icosahdre, sa queue est non contractile et il possde une plaque basale. 1/ se trouve donc dans le groupe B1de la classification de Bradley. Son gnome est constitu d'une, molcule d'ADN double brin de 40 kilobases possdant des extrmits cohsives. bactriophage /Propionibacterium freudenreichii / fromage