FIG. 4.

UV sensitivity of strains carrying the uvrD301 (A406V) mutation. Experiments were carried out as described in Materials and Methods. Data (log survival) are expressed as the logarithmic function of the number of UV-irradiated cells forming colonies divided by the number of colonies formed by unirradiated cells. The data presented represent the average of at least three independent experiments. ⊞, SK9040 (uvrDΔ294/pWSK29) at 30°C; ♦, SK9040 (uvrDΔ294/pWSK29) at 44°C; □, SK9041 (uvrDΔ294/uvrD⁺) at 30°C; ◊, SK9041 (uvrDΔ294/uvrD⁺) at 44°C; ○, SK9053 (uvrDΔ294/uvrD301) at 30°C; ▵, SK9053 (uvrDΔ294/uvrD301) at 44°C; ⊕, SK9063 (uvrD⁺/uvrD301) at 30°C; and ▿, SK9062 (uvrD⁺/uvrD301) at 44°C.