Synoptic view of the construction of the transcriptional lacZ fusions strains used in this work.

Column 2 corresponds to strains carrying plasmids (derived from pRS415) and harboring the different transcriptional lacZ gene fusions used in this work. The strains listed in columns 3 and 4 correspond to single copy chromosomal derivatives of the same lacZ gene fusions, carried by a lambda prophage. The strains listed in columns 5 to 10 under their relevant genotype have been obtained by phage P1 transduction. The numbers between parentheses refer to the respective recipient and donor strains used for transduction. Four digit numbers refer to strains names; JO suffices have been omitted for clarity.