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Transcriptional analysis of the restriction and modification genes of bacteriophage P1

Bacteriophage P1 res and mod genes encode the restriction and modification polypeptides of the Type III restriction enzyme EcoP1. Northern blot analysis using res‐ and mod‐specific probes revealed the presence of two separate transcripts in strains harbouring the Eco P1 restriction and modification genes. Furthermore, by constructing a series of fusions with a promoterless lacZ gene, we show that both the res and mod genes are transcribed from separate promoters. A more detailed investigation of the mod promoter region revealed two promoters located some 70 and 140 bp upstream from the translational start codon. In addition, another pair of promoters and a further separate promoter are located more than 500 bp upstream from this start codon. Two short open reading frames are located between these distal and proximal promoter clusters.