1887

Abstract

The temperate phage SfV encodes the genes responsible for the serotype conversion of strains from serotype Y to 5a. Bacteriophages often encode proteins that prevent subsequent infection by homologous phages; the mechanism by which this is accomplished is referred to as superinfection immunity. The serotype conversion mediated following lysogenization of SfV is one such mechanism. Another mechanism is the putative -like CI protein within SfV. This study reports the characterization of a third superinfection mechanism, transcription termination, in SfV. The presence of a small immunity-mediating RNA molecule, called CI RNA, and its essential role in the establishment of immunity, is shown. The novel role of the gene , located immediately downstream from the transcription termination region, in inhibiting the establishment of CI RNA-mediated immunity is also presented.

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2007-11-01
2021-10-22
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