Abstract
Mutants of the cI gene of prophage lambda have been defined phenotypically in a recA+ host as noninducible (Ind-), inducible (Ind+), or induction sensitive (Inds). We showed that a phage lambda cI+ carrying operator mutations v2 and v3 displays an Inds phenotype, as does lambda cI inds-1. We characterized a fourth induction phenotype called induction resistant (Indr). Using these four prophage types, we tested the influence of bacterial recA mutations on prophage induction. Indr prophages were fully induced in recA441 bacteria whose RecA441 protein is activated constitutively. Indr prophages were not induced in a mutant overproducing RecA+ protein, confirming that RecA+ protein must be activated to promote prophage induction. Inds prophages were induced in recA142 and recA453-441 lysogens, previously described as deficient in prophage induction.
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