Abstract
Phage bIL66 is unable to grow on Lactococcus lactis cells harboring the abortive infection gene abiD1. Spontaneous phage mutants able to grow on AbiD1 cells were used to study phage-Abi interaction. A 1.33-kb DNA segment of a mutant phage allowed growth of AbiD1s phages in AbiD1 cells when present in trans. Sequence analysis of this segment revealed an operon composed of four open reading frames, designated orf1 to orf4. The operon is transcribed 10 min after infection from a promoter presenting an extended -10 consensus sequence but no -35 sequence. Analysis of four independent AbiD1r mutants revealed a different point mutation localized in orf1, implying that this open reading frame is needed for sensitivity to AbiD1. However, the sensitivity is partly suppressed when orf3 is expressed in trans on a high-copy-number plasmid, suggesting that AbiD1 acts by decreasing the concentration of an available orf3 product.
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