Abstract
The toxigenic corynebacteriophage omega tox+ was isolated from the hypertoxigenic Park-Williams no. 8 (PW8) strain of Corynebacterium diphtheriae and compared with the toxigenic corynebacteriophage beta tox+. The physical size and host range of both phages were found to be identical. An endonuclease restriction map of omega tox+ was constructed, and the locations of the cohesive ends (cos), phage attachment site (attP), and the diphtheria tox operon were identified. The genome of omega tox+ was found to differ from that of beta tox+ in three regions. In addition, omega tox+ was shown to be integrated into two nontandem corynebacterial phage attachment sites (attB1, attB2) in the PW8 chromosome. The differences in the restriction endonuclease digestion maps of omega tox+ and beta tox+ and the contribution of double lysogeny are discussed in relation to the hypertoxigenicity of the PW8 strain.
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Selected References
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