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. 1989 Aug;63(8):3472–3478. doi: 10.1128/jvi.63.8.3472-3478.1989

The immunity (imm) gene of Escherichia coli bacteriophage T4.

M J Lu 1, U Henning 1
PMCID: PMC250924  PMID: 2746737

Abstract

The immunity (imm) gene of the Escherichia coli bacteriophage T4 effects exclusion of phage superinfecting cells already infected with T4. A candidate for this gene was placed under the control of the lac regulatory elements in a pUC plasmid. DNA sequencing revealed the presence of an open reading frame encoding a very lipophilic 83-residue (or 73-residue, depending on the unknown site of translation initiation) polypeptide which most likely represents a plasma membrane protein. This gene could be identified as the imm gene because expression from the plasmid caused exclusion of T4 and because interruption of the gene in the phage genome resulted in a phage no longer effecting superinfection immunity. It was found that the fraction of phage which was excluded upon infection of cells possessing the plasmid-encoded Imm protein ejected only about one-half of their DNA. Therefore, the Imm protein inhibited, directly or indirectly, DNA ejection.

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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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