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. 1990 Feb;172(2):1030–1034. doi: 10.1128/jb.172.2.1030-1034.1990

Transcription of a bacteriophage lambda DNA site blocks growth of Escherichia coli.

P Guzman 1, B E Rivera Chavira 1, D L Court 1, M E Gottesman 1, G Guarneros 1
PMCID: PMC208533  PMID: 2137118

Abstract

The rap mutation in Escherichia coli prevents the growth of bacteriophage lambda. Phage mutations that overcome rap inhibition (bar) have been mapped to loci in the pL operon. We cloned and sequenced three mutations in two of these loci: barIa to the left arm of the lambda attachment site (attP) and barII in the ssb (ea10) gene. The mutations represent single base-pair changes within nearly identical 16-base-pair DNA segments. Each mutation disrupts a sequence of dyad symmetry within the segment. Plasmids carrying a bar+ sequence downstream to an active promoter are lethal to rap, but not rap+, bacteria. The bar sequences isolated from the lambda bar mutants are not lethal. We synthesized a minimal lambda barIa+ sequence, 5'-TATATTGATATTTATATCATT, and cloned it downstream to an inducible promoter. When transcribed, this sequence is sufficient to kill a rap strain.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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