Dual regulatory control of a particle maturation function of bacteriophage P1.

A unique arrangement of promoter elements was found upstream of the bacteriophage P1 particle maturation gene (mat). A P1-specific late-promoter sequence with conserved elements located at positions -22 and -10 was expected from the function of the gene in phage morphogenesis. In addition to a late-promoter sequence, a -35 element and an operator sequence for the major repressor protein, C1, were found.