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. 1972 Jun;110(3):1022–1031. doi: 10.1128/jb.110.3.1022-1031.1972

Lytic Replication of Coliphage Lambda in Salmonella typhosa Hybrids

L S Baron 1, I R Ryman 1, E M Johnson 1, P Gemski Jr 1
PMCID: PMC247524  PMID: 4555401

Abstract

Hybrids between Escherichia coli K-12 and Salmonella typhosa which conserved a continuous K-12 chromosomal diploid segment extending from pro through ara to the strA locus were sensitive to plaque formation by wild-type λ. These partially diploid S. typhosa hybrids could be lysogenized with λ and subsequently induced to produce infectious phage particles. When the K-12 genes were segregated from a lysogenic S. typhosa hybrid, phage-productive ability was no longer detectable due to loss of a genetic region necessary for vegetative replication of λ. However, λ prophage was shown to persist in a quiescent state in the S. typhosa hybrid segregant with phage-productive ability being reactivated after replacement of the essential K-12 λ replication region. Low-frequency transduction and high-frequency transduction lysates containing the gal+ genes of S. typhosa were prepared by induction of λ-lysogenic S. typhosa hybrids indicating that the attλ site is chromosomally located in S. typhosa in close proximity to the gal locus as in E. coli K-12. After propagation in S. typhosa hybrids, λ was subject to restriction by E. coli K-12 recipients, thus establishing that S. typhosa does not perform the K-12 modification of λ deoxyribonucleic acid. Hybrids of S. typhosa, however, did not restrict λ grown previously on E. coli K-12. The K-12 genetic region required for λ phage production in S. typhosa was located within min 66 to min 72 on the genetic map of the E. coli chromosome. Transfer of an F-merogenote encompassing the 66 to 72 min E. coli chromosomal region to λ-insensitive S. typhosa hybrids enabled them to replicate wild-type λ. The λ-insensitive S. typhosa hybrid, WR4255, which blocks λ replication, can be mutagenized to yield mutant strains sensitive to λvir and λimm434. These WR4255 mutants remained insensitive to plaque formation by wild-type λ.

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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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