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. 1994 Aug;176(16):4809–4815. doi: 10.1128/jb.176.16.4809-4815.1994

Cloning of the early promoters of Pseudomonas aeruginosa bacteriophage D3: sequence of the immunity region of D3.

M A Farinha 1, B J Allan 1, E M Gertman 1, S L Ronald 1, A M Kropinski 1
PMCID: PMC196314  PMID: 8050993

Abstract

The early promoters of bacteriophage D3 of Pseudomonas aeruginosa were cloned and physically mapped to the right 25% of the phage genome. The promoters were cloned into promoter selection vector pQF26, and their relative strengths, the direction of transcription, and whether they were directly regulated by repressor were determined. A 3.3-kb fragment of the genome containing the immunity region was sequenced and analyzed (GenBank accession number: L22692). The promoter activity associated with this region was determined to be bidirectional and repressible, indicating that this region contains operator-promoter complexes. Sequence and functional analyses suggest that this region is analogous to the immunity region of coliphage lambda. Two strong promoters, one of which was repressible, were found to be located adjacent to the immunity region. Clear-plaque mutant phage D3c contains insertion element IS222, which causes it to behave as a repressor-negative (c1) variant. The site of insertion of IS222 was sequenced and determined to lie within the c1 gene open reading frame. This phage shows remarkable similarity in genomic organization to coliphage lambda and its relatives.

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Selected References

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