Figure 4From: Absence of functional TolC protein causes increased stress response gene expression in Sinorhizobium melilotiActivity of enzymes combating oxidative stress. Enzymatic activities of (a) glutathione reductase as measured spectrophotometrically at 412 nm; (b) catalase and (c) superoxidase dismutase in native gel after staining. Total protein extracts were obtained after growing the wild-type strain Sm1021 and the tolC mutant strain SmLM030-2 for 20 hours in GMS medium. 20 μg of crude extract were loaded in each lane. Arrows indicate the position of bands obtained.Back to article page