Abstract
Two bacteriophages (φBrb01 and φBrb02), lytic toBacteroides ruminicola ssbrevis AR20, were isolated from sewage water. Both phages possessed polyhedral heads and long noncontractile tails, and were classified as Siphoviridae of morphotype B1. Bacteria resistant to phages φBrb01 and φBrb02 arose following lysis of broth cultures. Survivors of φBrb01 infection were capsulated but remained susceptible to φBrb02 infection. Survivors of φBrb02 infection were noncapsulated and were resistant to attack by both φBrb01 and φBrb02. Neither phage lysogenized the host. Both phages contained double-stranded DNA, and their restriction endonuclease digestion patterns indicated that the phage genomes were circularly permuted and terminally redundant. Phage φBrb01 genome was examined in greater detail and confirmed to be circularly permuted, of size 33 kb, with a terminal redundancy of 2 kb, or 6% of the length of the genome. Circularly permuted genomes in phages of rumen bacteria do not appear to have been reported previously.
At present, there is considerable interest in the genetic manipulation of rumen bacteria. The characterization of the phages described herein provides the basic information required for their use in the construction of vectors for the transfer of genetic material.
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Klieve, A.V., Gregg, K. & Bauchop, T. Isolation and characterization of lytic phages fromBacterioides ruminicola ssbrevis . Current Microbiology 23, 183–187 (1991). https://doi.org/10.1007/BF02092277
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DOI: https://doi.org/10.1007/BF02092277