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J. Bacteriol., 07 1995, 3824-3829, Vol 177, No. 13
E Bidnenko, D Ehrlich and MC Chopin
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.
Copyright © 1995, American Society for Microbiology
Phage operon involved in sensitivity to the Lactococcus lactis abortive infection mechanism AbiD1
Laboratoire de Genetique Microbienne, Institut National de la Recherche Agronomique, Jouy-en-Josas, France.
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