FIG. 9.

Proposed temporal sequence of PM2 transcription. The three functional promoters are depicted. Promoter P₁₂₀₇ controlling the early genes (operon OEL) is repressed by protein P15. The genes for the DNA replication proteins (operon OER) are under the control of P₁₁₉₃. Proteins P15 and P16 have repressor effects on this promoter. Transcription factors P13 and P14 are needed to switch on the late promoter P₅₃₂₁ for the production of the structural components of the virus particle (operon OL). Homology to the Pseudoalteromonas plasmid pAS28 is indicated with a bar.