Requirement for a functional int product in temperature inductions of prophage P22 ts mnt.

Prophage P22 ts mnt was found to be inducible by high temperatures. This property was maintained when the ts mnt allele was recombined into a phage that cannot synthesize phage deoxyribonucleic acid at high temperature. Prophage P22 int ts mnt, on the other hand, was not inducible at high temperature. This result leads to the suggestion that the int enzyme, which is involved in excision, is regulated by the product of gene mnt.