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. 1988 May;62(5):1697–1704. doi: 10.1128/jvi.62.5.1697-1704.1988

Alternative promoters in the development of bacteriophage plasmid P4.

G Dehó 1, S Zangrossi 1, D Ghisotti 1, G Sironi 1
PMCID: PMC253205  PMID: 2833620

Abstract

Infection of Escherichia coli with the satellite virus P4 without its helper bacteriophage P2 leads either to the immune integrated state or to the nonimmune multicopy plasmid condition. We analyzed the transcription pattern of the phage plasmid P4 early and late after infection and during the stable plasmid or lysogenic condition. The early postinfection phase is characterized by the leftward transcription of an operon including the genes cI (P4 immunity) and alpha (replication). This early transcript starts from the promoter PLE, which shows a good homology with the E. coli sigma 70 promoter. At later times, the transcription of this operon starts from a different promoter, PLL, located 400 base pairs upstream of PLE, and sharing little homology with the canonical E. coli promoter sequence; a longer transcript encoding an additional open reading frame is thus produced. PLL shares two boxes of homology with the P4 late promoter PSID, positively regulated by the P4 delta gene product, and depends on delta function for its full activation. In the multicopy plasmid state, the transcription pattern is similar to that observed at late times after infection. Since in the plasmid state not only is P4 immunity not expressed but its establishment is prevented, even though the P4 cI gene is transcribed, the P4 cI function may be regulated at the posttranscriptional level. In the immune state, transcription starts from PLE but does not continue to cover the P4 alpha gene. This suggests that P4 immunity acts by prematurely terminating transcription initiated at PLE.

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Selected References

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