Effects of antipain (a protease inhibitor) on respiration, viability, and excision of pyrimidine dimers in UV-irradiated Escherichia coli cells

The protease inhibitor antipain increases the effectiveness of UV irradiation on cessation of respiration and cell killing in Escherichia coli B/r cultures without affecting excision of pyrimidine dimers. The actions are similar to those caused by cyclic AMP in irradiated cultures.