Clear Plaque Mutants of Lactococcal Phage TP901-1

Witold Kot, Mogens Kilstrup, Finn K. Vogensen, Karin Hammer

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    Abstract

    We report a method for obtaining turbid plaques of the lactococcal bacteriophage TP901-1 and its derivative TP901-BC1034. We have further used the method to isolate clear plaque mutants of this phage. Analysis of 8 such mutants that were unable to lysogenize the host included whole genome resequencing. Four of the mutants had different mutations in structural genes with no relation to the genetic switch. However all 8 mutants had a mutation in the cI repressor gene region. Three of these were located in the promoter and Shine-Dalgarno sequences and five in the N-terminal part of the encoded CI protein involved in the DNA binding. The conclusion is that cI is the only gene involved in clear plaque formation i.e. the CI protein is the determining factor for the lysogenic pathway and its maintenance in the lactococcal phage TP901-1.
    Original languageEnglish
    Article numbere0155233
    JournalP L o S One
    Volume11
    Issue number6
    Number of pages10
    ISSN1932-6203
    DOIs
    Publication statusPublished - 2016

    Bibliographical note

    © 2016 Kot et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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